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WO2025027650A1 - Insert fileté pour vissage à la machine - Google Patents

Insert fileté pour vissage à la machine Download PDF

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Publication number
WO2025027650A1
WO2025027650A1 PCT/IN2024/051426 IN2024051426W WO2025027650A1 WO 2025027650 A1 WO2025027650 A1 WO 2025027650A1 IN 2024051426 W IN2024051426 W IN 2024051426W WO 2025027650 A1 WO2025027650 A1 WO 2025027650A1
Authority
WO
WIPO (PCT)
Prior art keywords
threaded insert
threads
bottom end
insert
cylindrical housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/IN2024/051426
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English (en)
Inventor
Sweta JHUNJHUNWALA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO2025027650A1 publication Critical patent/WO2025027650A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/12—Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
    • F16B37/122—Threaded inserts, e.g. "rampa bolts"
    • F16B37/125—Threaded inserts, e.g. "rampa bolts" the external surface of the insert being threaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/24—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/06—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips
    • F16B5/0607—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other
    • F16B5/0621—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other in parallel relationship

Definitions

  • TITLE A THREADED INSERT FOR MACHINE SCREWING
  • the present invention is related, generally to a threaded insert for machine screwing, and more particularly but not exclusively, to a threaded insert designed for easy insertion to surface selected from metals, tiles, stones, glass, plastics, and wood and getting rigidly fastened within respective surface inserted into.
  • the present invention also relates to method of manufacturing and installation of the threaded insert.
  • a threaded insert is a type of fastener used to create a threaded hole in a material that cannot support threads directly.
  • the threaded insert is sometimes referred to as a threaded bushing or threaded insert nut.
  • the threaded insert permits the insertion of a bolt or machine screw into the material.
  • threaded inserts exist in a variety of styles and materials, they typically have an interior metal cylinder. When inserted into the material, the exterior surface may contain knurling or other characteristics to improve grip.
  • threaded inserts offer a stronger and more long-lasting threading option. They are frequently utilized in situations where recurrent assembly and disassembly may be necessary or where the material is vulnerable to stripping or wear.
  • Threaded inserts may not be suitable for all materials. Soft or brittle materials, such as certain plastics or ceramics, may not provide enough strength or stability for the insert. In such cases, alternative fastening methods might be necessary. Further, appropriate preparation of the hole for the threaded insert is crucial. If the hole is not drilled or tapped accurately, it can affect the alignment and stability of the insert. Inadequate hole preparation can lead to loose or ineffective threading. Furthermore, threaded inserts may over time become loose as a result of vibrations, thermal expansion and contraction, or other external forces, depending on the application and material. This may result in a loss of thread engagement and jeopardize the fastening's integrity.
  • threaded insert's pull-out strength is a crucial consideration, particularly in applications where the insert is put to axial or high-tension pressures.
  • the insert might break under stress, causing material damage or thread stripping if it doesn't have enough pull-out strength.
  • Threaded inserts can be more expensive than other fastening options, and their installation may require specialized tools or equipment.
  • the installation process itself can be time-consuming and labor-intensive, especially when dealing with a large number of inserts and relatively hard surface to drill.
  • the length of the threaded portion in a conventional threaded insert is typically limited. Such limitation can restrict the number of threads engaged with the machine screw or bolt, potentially affecting the strength and reliability of the connection.
  • Such problems require performance of reforming the threaded inserts to overcome the existing problems in the conventional threaded inserts.
  • threaded insert that is durable, applicable on hard and dense surfaces, cost effective, easy to keep fastened with object in context, and having material strength.
  • the present disclosure relates to a threaded insert for machine screwing.
  • the threaded insert comprises a cylindrical housing having a top end, a bottom end, and a central bore therethrough, wherein the bottom end is tapered and wherein said cylindrical housing comprises two or more diametrically cut slits at the bottom end.
  • the threaded insert further comprises an internal surface of the central bore including female threads in clockwise or anticlockwise direction throughout the length of the central bore till a first portion preceding the bottom end.
  • the threaded insert includes an external surface of the cylindrical housing having male threads in clockwise or anticlockwise direction throughout the length of the cylindrical housing till a starting point of the bottom end, and may optionally contain two or more wedge-shaped slots vertically engraved on the external surface of the cylindrical housing.
  • the present disclosure relates to a method of manufacturing a threaded insert.
  • the method comprises the steps of providing a metal rod having a predefined diameter; providing male threads in clockwise or anti-clockwise direction on external surface of the metal rod; and cutting the metal rod having the male threads along axis of the metal rod based on desired length as required for a particular substrate.
  • the method includes providing a bore in center of each piece of cut metal rod by drilling along the axis of the cut piece of the metal rod and leaving a tapered end at bottom of each piece of the metal rod; tapping a female thread in clockwise or anti-clockwise direction in the bore of each piece of the metal rod up to a point where the tapered end starts; and cutting a head or slot in each piece of the metal rod at a top end along the diameter of the piece.
  • the method further optionally comprises cutting two or more wedge-shaped slots on the external surface along the axis of the piece of metal rod, wherein each of the wedge-shaped slots comprises a sharp straight edge on the one side and a gradual slant edge on the other side; and cutting two or more diametrical slits at bottom end.
  • the present disclosure relates to a method for surface to surface indirect contact-based joinery installation.
  • the method comprises the steps of screwing in an internally threaded insert, with two or more diametrically cut slits at the bottom end, on a surface; screwing in a load bolt, having a tapered bottom edge/tip, into top end of threaded insert to activate dilation of undercuts; and putting a tensioner or spring, housing the load bolt, between the other surface, that needs to be joined to the threaded insert bearing surface, and the threaded insert bearing surface, before tightening the load bolt.
  • the present disclosure relates to a method for surface to surface direct contact-based joinery installation.
  • the method comprises the steps of screwing in an internally threaded insert, with two or more diametrically cut slits at the bottom end, on a surface; screwing in a load bolt, having a tapered bottom edge/tip, into top end of threaded insert to activate dilation of undercuts; and putting a spring washer below the load bolt before tightening the load bolt.
  • Figure 1 illustrates a sectional view of the threaded insert, in accordance with some embodiments of the present disclosure
  • Figure 2 illustrates a side view of the threaded insert, in accordance with some embodiments of the present disclosure
  • Figure 3 illustrates an exemplary top view of a threaded insert, in accordance with some embodiments of the present disclosure
  • Figure 4 illustrates a perspective view of the threaded insert, in accordance with some embodiments of the present disclosure
  • Figure 5 illustrates a rotational view of the threaded insert with respect to the screw, in accordance with some embodiments of the present disclosure
  • Figure 6 illustrates an exploded view of a surface to surface direct contact joinery using the threaded insert, in accordance with some embodiments of the present disclosure
  • Figure 7 illustrates an exploded view of a surface to surface suspended indirect contact joinery using the threaded insert, in accordance with some embodiments of the present disclosure
  • Figure 8 illustrates a method of manufacturing the threaded insert, in accordance with some embodiments of the present disclosure
  • Figure 9 illustrates a method for surface to surface direct contact -based joinery installation, in accordance with some embodiments of the present disclosure
  • Figure 10 illustrates a method for surface to surface suspended indirect contact -based joinery installation, in accordance with some embodiments of the present disclosure.
  • the present disclosure relates to a threaded insert for machine screwing.
  • the threaded insert comprises a cylindrical housing having a top end, a bottom end, and a central bore therethrough, wherein the bottom end is tapered and wherein said cylindrical housing comprise two or more diametrically cut slits at the bottom end.
  • the threaded insert further comprises an internal surface of the central bore having female threads in clockwise or anticlockwise direction throughout length of the central bore till a first portion preceding the bottom end.
  • the threaded insert includes an external surface of the cylindrical housing having male threads in clockwise or anticlockwise direction throughout the length of the cylindrical housing till a starting point of the bottom end, and may optionally contain two or more wedge-shaped slots vertically engraved on the external surface of the cylindrical housing.
  • each of vertically engraved wedge-shaped slots comprises a sharp straight edge on the one side and a gradual slant edge on the other side, wherein the sharp straight edge cuts a female thread on an inside surface of a bore created in the substrate while tightening the threaded insert and the slant portion of the slant edge provides access to the sharp edge to cut threads in the substrate.
  • unscrewing a bolt within the central bore in clockwise direction tightens the threaded insert within the substrate when the external surface of the threaded insert is having male threads in clockwise direction.
  • unscrewing a bolt within the central bore in anticlockwise direction tightens the threaded insert within the substrate when the external surface of the threaded insert is having male threads in anticlockwise direction.
  • the present invention also relates to a method of manufacturing a threaded insert (100), the method comprises: a) providing a metal rod with a top end and a bottom end; b) providing male thread in clockwise or anti-clockwise direction on external surface of the metal rod; c) providing a bore in center of each piece of metal rod by drilling along the axis of the metal rod and leaving a tapered end at bottom of each piece of the metal rod; d) tapping a female thread in clockwise or anti-clockwise direction in the bore of each piece of the metal rod up to a point where the tapered end starts; e) cutting two or more diametrical slits at bottom end.
  • cylindrical housing is made up of metal.
  • metal is steel.
  • steel is of grade EN-MS-8 or higher.
  • steel is of grade SS304 or higher.
  • two or more diametrically cut slits at the bottom end are at equal distance.
  • female threads on an internal surface and male threads on an external surface are in same direction. In one or more preferred embodiments, female threads on an internal surface are in clockwise direction and male threads on an external surface are in anticlockwise direction. In one or more preferred embodiments, female threads on an internal surface are in anticlockwise direction and male threads on an external surface are in clockwise direction. In one or more preferred embodiments, threads are selected from group consisting of British Standard Whitworth (BSW) threads or buttress threads.
  • BSW British Standard Whitworth
  • the bottom end of the external surface is tapered for guided insertion.
  • the top end comprises a head or slot along the diameter of the cylindrical housing for fixing threaded insert.
  • the said head or slot are selected from group consisting of straight-line slot, four way screw driver slot, punched slots, Phillips screw driver slots and Allen key slot.
  • unscrewing a bolt within the central bore tightens the threaded insert within the substrate when threads on the internal and external surface are in opposite direction.
  • the threaded insert (100) as per presentation is capable of installation on the surface selected from the group consisting of metals, tiles, stones, glass, plastics, and wood.
  • the present invention relates a surface to surface direct contact based joinery installation method, wherein said method comprises steps of a. Screwing in an internally threaded insert, with two or more diametrically cut slits at the bottom end, on a surface, b. Screwing in the load bolt, having a tapered bottom edge/tip, into top end of threaded insert of step (a) to activate dilation of undercuts,
  • a washer is put below the load bolt before tightening the load bolt into the threaded insert to secure a tight fitment.
  • the washer may be selected from group consisting of standard flat sheet washer, split wire spring washer, wave type sheet spring washer and dish type spring washer.
  • the present invention relates a surface to surface suspended indirect contact-based joinery installation method, wherein said method comprises steps of a. Screwing in an internally threaded insert with two or more diametrically cut slits at the bottom end, b. Screwing in the load bolt, having a tapered bottom edge/tip, into top end of threaded insert of step (a) to activate dilation of undercuts, c. Putting a tensioner or spring, housing the load bolt, between the other surface, that needs to be joined to the threaded insert bearing surface, and the threaded insert bearing surface, before tightening the load bolt.
  • the threaded insert may be installed by self-tapping threaded insert into bare holes on surface materials like wood; wooden derivatives like plywood, particle boards, MDF, HDF; Soft Plastics; Corian; soft sandstones.
  • the threaded insert may be installed into pre-threaded holes on surface materials like metals, marbles, hard stones, granites, manufactured tiles, porcelain, acrylics, hard plastics, glass, wood; wooden derivatives like plywood, particle boards, MDF, HDF; Soft Plastics; Corian and soft sandstones.
  • the threaded insert for surface to surface joinery installation method may be the threaded insert as per present invention. In one or more embodiments, the threaded insert for surface to surface joinery installation method may be an insert with fastening capabilities by dilation of undercuts.
  • a surface to surface suspended based joinery installation method are suitable to absorb and protect against any kinds of external or internal forces that might be affected on the surfaces, e.g. vibrations in joineries between moving and/or static members.
  • FIG. 1 illustrates the sectional view of the threaded insert, in accordance with some embodiments of the present disclosure.
  • the threaded insert (100) is having a cylindrical housing with a predefined wall thickness, height, and outer diameter of the cylinder.
  • the cylindrical housing comprises a top end, a bottom end and a central bore therethrough.
  • a surface of the central bore includes female threads in clockwise direction throughout length of the central bore till a first portion preceding the bottom end. The first portion is unthreaded.
  • an external surface of the cylindrical housing includes male threads in anticlockwise direction throughout the length of the cylindrical housing till a starting point of the bottom end.
  • Two or more wedge- shaped slots are vertically engraved on the external surface of the cylindrical housing.
  • the threads (106) on the external surface of the threaded insert (100) follows an anticlockwise (counterclockwise) direction, while the threads (110) in the surface of the central bore of the threaded insert (100) follows a clockwise direction.
  • Such configuration is known as a reverse-threaded or left-hand threaded insert.
  • the threaded insert (100) is having the opposite threading direction compared to standard right-hand threaded inserts.
  • Such reverse-threaded insert is used to create a locking mechanism.
  • a corresponding left-hand threaded fastener such as a bolt or screw
  • the opposing threading directions create resistance to self-loosening.
  • threaded inserts (100) may be used to ensure proper assembly, disassembly, or alignment.
  • the threaded inserts (100) serves as a way to differentiate or customize fastening components for specific purposes.
  • threaded inserts (100) are used to counteract torque or rotational forces. By having opposing thread directions between the insert and the fastener, it can help balance or neutralize the overall torque applied to the assembly. Further, during use of a threaded insert with a machine screw, applied load on the machine screw acts in a direction perpendicular to a surface, however, the threaded insert blocks the load in the horizontal direction.
  • Figure 2 illustrates the side view of the threaded insert, in accordance with some embodiments of the present disclosure.
  • the bottom end (108) is tapered and comprise two or more diametrically cut slits threads (106) in outer surface in anticlockwise direction.
  • the cylindrical housing further comprises two or more wedge-shaped slots (104) vertically engraved on the external surface of the cylindrical housing.
  • the wedge-shaped slots (104) are also shaped in such manner that each of the wedge-shaped slots produces a longitudinal slot over the threads (106) of the threaded insert (100).
  • the tapered bottom end (108) of the threaded insert (100) typically refers to a feature where the end of the threaded insert has a gradual reduction in diameter, resulting in a cone-shaped or pointed tip.
  • Such tapered bottom end (108) serves various purposes depending on the application and the type of threaded insert (100).
  • the tapered end (108) allows for smoother insertion of the threaded insert (100) into the material and helps guide the threaded insert (100) into the pilot hole and facilitates the initial threading process. In certain materials, such as wood or plastic, the tapered bottom end can help prevent splitting or cracking by gradually displacing the material rather than abruptly forcing it apart during insertion.
  • the tapered end (108) can also aid in aligning the threaded insert (100) with the pilot hole, especially when working with less precise or pre-drilled holes. It allows the threaded insert to self-center and helps reduce the risk of the threaded insert (100) deviating from the intended path.
  • the tapering of the bottom end (108) increases the holding power of the threaded insert (100). As the threaded insert (100) is tightened, the tapered end wedges itself into the material, creating a secure and tight connection.
  • the tapered end can minimize damage to the surface of the material during insertion. The gradual reduction in diameter reduces the chances of marring or gouging the material.
  • Figure 3 illustrates an exemplary top view of a threaded insert, in accordance with some embodiments of the present disclosure.
  • the threaded insert (100) comprises a tightening tool slot (102) of type as one of straight-line slotted, 4 way slotted, Philips type, Allen key slotted etc. at top in order to enable an operator to screw or unscrew the threaded insert inside an object.
  • the tightening tool slot of a threaded insert typically refers to the part of the insert that allows for the insertion and removal of the insert using a compatible tool, such as a screwdriver or an Allen wrench. Threaded inserts are commonly used to provide a threaded hole in a material that may not have sufficient strength or durability to support direct threading or that is extremely dense for enabling direct threading of a screw therein.
  • the tightening tool slot of a threaded insert can vary depending on the specific design and application.
  • Some common tightening tool slot types found on threaded inserts include slotted head, Philips head, Allen/hex head, torx head, square head, combination head etc.
  • the slotted head has a single slot that allows for the use of a standard screwdriver to insert or remove the insert.
  • the Philips head has a cross-shaped slot and require a Philips screwdriver for insertion and removal.
  • the Allen/hex head features a hexagonal recess in the screw head, requiring an Allen wrench or hex key for installation and removal.
  • the torx head has a star-shaped recess and require a compatible torx screwdriver or key for insertion and removal.
  • the square head has a square-shaped recess, usually requiring a square drive bit or wrench for insertion and removal.
  • the combination head features a combination screw head, such as a slotted head with a hexagonal socket in the center.
  • Such combination head allows for the use of either a standard screwdriver or a hex key for installation and removal.
  • the specific type of tightening tool slot used on a threaded insert will depend on the manufacturer, the intended application, and the desired level of security and ease of use.
  • the threaded insert (100) further structured optionally with vertically engraved wedge-shaped slots (104) in at least two different sides of the threaded insert (100).
  • Each of the wedge-shaped slots (104) is laterally shaped as a sharp straight edge (104-1) on the right and a gradual slant edge (104-2) at the other side.
  • the wedge-shaped slots (104) in the threaded insert (100) refer to grooves or slots that run parallel to the axis of the threaded insert (100). These grooves are designed to provide additional gripping strength and resistance to rotation when the threaded insert is installed in a material.
  • the longitudinal grooves in the threaded insert serve few purposes such as self-tapping threads while screwing-in, increased frictional grip, easy insertion etc.
  • the wedge-shaped slots (104) create frictional engagement between the threaded insert and the surrounding material, providing a secure grip. Such grip is beneficial when the insert is used in softer or low-friction materials. They can act as channels for displaced material, allowing for smoother, unobstructed and easier installation.
  • the sharp straight edge (104- 1) of each of the wedge-shaped slots aids in cutting the material.
  • the sharp straight edge (104-1) on the threaded insert refer to specific design features where the wedge-shaped slots have a sharp or pointed edge rather than a rounded or chamfered one. Such sharp-edged wedge-shaped slots serve a distinct purpose in certain applications.
  • the sharp-edged wedge-shaped slots are designed to cut into the material during the installation process.
  • the wedge-shaped slots function as tap for the threaded insert.
  • the sharp straight edges (104-1) of the wedge- shaped slots help create clean and precise threads, especially in materials like wood or plastic or relatively less dense materials.
  • the sharp straight edges dig into the material for creating threads on the inner wall of the central bore in the insert.
  • the sharp points bite into the material, offering resistance to rotational forces.
  • the slant edge (104-2) indicates a feature where the edges of the wedge-shaped slots are chamfered or beveled at an angle rather than being sharp or pointed.
  • the slant edge (104-2) is shaped in such a manner so as to enable the sharp edge maximum grip on the material where the threaded insert is being installed. Therefore, the association of the sharp edge (104-1) and the slant edge (104-2) of the wedge-shaped slots of the threaded insert produces a passage in the wedge-shaped slots of the threaded insert, wherein such passage aids in collecting wear debris produced due to cutting of material within which the threaded insert is placed into.
  • the slant edge functions for collecting debris and give access to the respective sharp edge.
  • Figure 4 illustrates the perspective view of the threaded insert, in accordance with some embodiments of the present disclosure.
  • the bottom end of the threaded insert is tapered and the bottom end comprises two or more diametrically cut slits cut at mutually equal distances avoiding the diametrical Line of the tightening tool slot on the top end.
  • the two or more diametrically cut slits on the tapered bottom end get widened / dilated upon receipt of force that is applied by a bolt from inside the bore of the threaded insert and make the threaded insert permanently locked inside the substrate.
  • the diametrically cut slits on the bottom end act as anchor fastener in the substrate.
  • the threaded insert when a bolt having a tapered tip is tightened into the threaded insert, the bolt tends to exert horizontal force on the internal walls of the threaded insert, thereby widening the bore due to the diametrically cut slits. Such operation produces a force field perpendicular to the axis which restricts any kind of movement of the threaded insert vertically along the axis.
  • the threaded insert is permanently locked within the substrate. Therefore, the threaded insert neither can come out nor go inside into the substrate once the threaded insert is fixed into the substrate.
  • the threaded insert becomes an integral part of the substrate itself as if the substrate itself had a permanent female thread to support any kind of bolt to fix any other surface to that surface.
  • Figure 5 illustrates the rotational view of the threaded insert with respect to the screw, in accordance with some embodiments of the present disclosure.
  • a machine screw (200) rotates in clockwise direction in order to get inserted within the threaded insert (100).
  • the machine screw also comprises a tapered bottom end to be appropriately accommodated by the bottom end of the threaded insert (100).
  • rotational impact refers to the interaction between the threads of the insert and the screw during the tightening or loosening process.
  • the impact can vary depending on the design and compatibility of the threads.
  • the thread compatibility includes matching the thread size, pitch (spacing between threads), and thread type (e.g., metric, UNC, UNF, etc.). Use of mismatched threads can lead to poor engagement, difficult assembly, or potential damage to the threads. Further, when the machine screw is tightened into the threaded insert, torque is applied to the assembly. The threads of the insert and the screw interact, transferring the rotational force from the tool to the fastening components. Proper thread engagement ensures efficient torque transfer, resulting in secure fastening. Depending on the application requirements, additional measures such as thread locking compounds, adhesive coatings, or locking features on the threads (e.g., nylon inserts) may be used to prevent unintentional loosening of the screw or insert due to vibration or dynamic forces. Furthermore, care must be taken to avoid excessive torque that can lead to thread stripping or deformation. Applying excessive force can cause the threads to strip or the insert to become damaged, compromising the integrity of the fastening connection.
  • the threaded insert may be designed with locking component that gets expanded inside the material so as to make the fitting of the threaded insert permanent.
  • the proposed invention provides a most reliable improvised threaded insert irrespective of the movements performed by the screwing machine.
  • Figure 6 illustrates an exploded view of a surface to surface direct contact joinery using the threaded insert, in accordance with some embodiments of the present disclosure.
  • a machine screw (200), a threaded insert (100), a spring washer (122) are required to install the surface to surface direct contact joinery (124).
  • blind hole (118) is drilled to keep the front exposed surface intact with no visibility of the hole behind. Such configuration provides aesthetic requirement of the joinery while cladding a surface with another surface.
  • the threaded insert having wedge shaped longitudinal slots on the outer surface, can be directly screwed in into the blind hole with the help of a throttled drive with very slow RPMs to simultaneously tap the threads while screwing the insert, using the insert itself as the tapping tool.
  • a throttled drive with very slow RPMs to simultaneously tap the threads while screwing the insert, using the insert itself as the tapping tool.
  • Such application can be made only on materials which are capable of holding threads and molecular structure / internal bonding within the material is such that it can sustain threads, and only on surfaces where threads can be easily tapped using standard drilling tools and processes.
  • standard Hi-Speed steel / carbide drilling bits with customized flatter starting tip - 10 - 15* instead of standard 45* is used.
  • Screwing in the insert using throttled driving head at very low RPMs with high torque, as required for cutting the threads while tapping enables to use the insert itself as a tap and simultaneously tapping threads and fixing the insert into the blind hole of accurately requisite diameter in the respective substrate.
  • the threaded insert provides ease of fixing the inserts in materials that are easy to cut threads in and that can sustain threads. In these substrates fixing doesn’t even require any specialized machinery, but not suitable for any harder materials like stones Glass Tiles etc. where it is not easy to cut threads without specialized tools and machineries.
  • female threads are engraved in the hole by using appropriate tapping tools or threading methods for cutting or engraving threads in respective materials of surfaces. Thereafter, the threaded insert is gently screwed into the pre-threaded hole.
  • Such application can be made on all kinds of materials irrespective of whether they can sustain threads or not, only process for materials which are hard, brittle and not capable of holding threads, especially for materials where it’s not easy to tap threads by standard drilling tools and processes.
  • Custom made non-core diamond braised bits is designed to flush out the debris generated during drilling process.
  • the insert is screwed using normal drive throttled at low RPMs so that it doesn’t damage the threads while screwing and/or manually by using tightening hand tools. No specialty drive is required for such process.
  • a load bolt that is the bolt of requisite length having a tapered tip in the bottom end, is screwed in so that the tapered tip of the bolt can enter into the tapered end of the threaded insert thereby exerting an outward force on the walls of the housing in the threaded insert from inside, thereby causing the same to dilate at the cut slits in the bottom of the insert, and thereby locking the insert at the position it is inside the surface.
  • the load bolt is unscrewed and passed through the hole of appropriate diameter in the other surface required to be joined with the insert bearing surface, optionally keeping a washer between the load bolt and the other surface for better fit, and again screwing in the same into the threaded insert till it is fully tight so as to give an absolutely secured joint between the two directly contacting surfaces.
  • Figure 7 illustrates an exploded view of a surface to surface suspended indirect contact joinery using the threaded insert, in accordance with some embodiments of the present disclosure.
  • a machine screw (200), a threaded insert (100), a load spring spacer assembly (112, 114, 116) are required to install the surface to surface indirect contact joinery (120).
  • blind hole (118) is drilled to keep the front exposed surface intact with no visibility of the hole behind. Such configuration provides aesthetic requirement of the joinery while cladding a surface with another surface.
  • the threaded insert having wedge shaped longitudinal slots on the outer surface, can be directly screwed in into the blind hole with the help of a throttled drive with very slow RPMs to simultaneously tap the threads while screwing the insert, using the insert itself as the tapping tool.
  • a throttled drive with very slow RPMs to simultaneously tap the threads while screwing the insert, using the insert itself as the tapping tool.
  • Such application can be made only on materials which are capable of holding threads and molecular structure / internal bonding within the material is such that it can sustain threads, and only on surfaces where threads can be easily tapped using standard drilling tools and processes.
  • standard Hi-Speed steel / carbide drilling bits with customized flatter starting tip - 10 - 15* instead of standard 45* is used.
  • Screwing in the insert using throttled driving head at very low RPMs with high torque, as required for cutting the threads while tapping enables to use the insert itself as a tap and simultaneously tapping threads and fixing the insert into the blind hole of accurately requisite diameter in the respective substrate.
  • the threaded insert provides ease of fixing the inserts in materials that are easy to cut threads in and that can sustain threads. In these substrates fixing doesn’t even require any specialized machinery, but not suitable for any harder materials like stones Glass Tiles etc. where it is not easy to cut threads without specialized tools and machineries.
  • female threads are engraved in the hole by using appropriate tapping tools or threading methods for cutting or engraving threads in respective materials of surfaces. Thereafter, the threaded insert is gently screwed into the pre-threaded hole.
  • Such application can be made on all kinds of materials irrespective of whether they can sustain threads or not, only process for materials which are hard, brittle and not capable of holding threads, especially for materials where it’s not easy to tap threads by standard drilling tools and processes.
  • Custom made non-core diamond braised bits is designed to flush out the debris generated during drilling process.
  • the insert is screwed using normal drive throttled at low RPMs so that it doesn’t damage the threads while screwing and/or manually by using tightening hand tools. No specialty drive is required for such process.
  • a load bolt that is the bolt of requisite length having a tapered tip in the bottom end, is screwed in so that the tapered tip of the bolt can enter into the tapered end of the threaded insert thereby exerting an outward force on the walls of the housing in the threaded insert from inside, thereby causing the same to dilate at the cut slits in the bottom of the insert, and thereby locking the insert at the position it is inside the surface.
  • the load bolt is unscrewed and passed through the hole of appropriate diameter in the other surface required to be joined with the insert bearing surface, keeping a tensioner between this other surface and the insert bearing surface. Further, the load bolt is screwed into the threaded insert till it is fully tight, simultaneously compressing the tensioner till it exerts the requisite rebounding force on the other surface, so as to give an absolutely secured joint between the two indirectly contacting surfaces, duly suspended due to the tensioner in between the two surfaces.
  • Such kind of installation facilitates in indirect, contactless joineries between two surfaces, used mainly for load management while joining two surfaces.
  • Some of the exemplary applications are facades, wall claddings, machinery foundation holding, applications where joining of two surfaces are required where there are access constraints and obstructions on one side of the surface so it requires fixing the surfaces from the same side from which the load is put.
  • Figure 8 is an exemplary method of the present disclosure and illustrates various steps of the method (300) for manufacturing a threaded insert.
  • the method (300) comprises one or more blocks to be performed to manufacture a threaded insert.
  • the order in which the method (300) is described is not intended to be construed as a limitation, and any number of the described method blocks can be combined in any order to implement the method. Additionally, individual blocks may be deleted from the methods without departing from the spirit and scope of the subject matter described herein.
  • a metal rod having a predefined diameter is provided.
  • the metal rod with a carefully chosen diameter is meticulously selected for the manufacturing of a threaded insert. This strategic choice ensures optimal strength, durability, and precision in creating a reliable threaded connection, meeting the demands of various applications.
  • male thread is provided on the external surface of the metal rod.
  • the male thread having sharp thread tips, is provided in anti-clockwise direction on external surface of the metal rod.
  • the external surface of the metal rod is intricately machined to feature the male thread, ensuring a robust and secure connection. Such precision in design guarantees the threaded insert's functionality and resilience in diverse applications.
  • the metal rod is cut along the axis into pieces based on desired size.
  • the metal rod having the male thread along axis of the metal rod is cut based on desired length as required for a particular substrate.
  • the manufacturing process progresses as the rod is skillfully cut along the axis into pieces, each tailored to the desired size. Such step ensures precision and uniformity, laying the foundation for the production of threaded inserts with consistent dimensions.
  • a bore in center of each piece is provided by drilling.
  • the providing (308) a bore in center of each piece of cut metal rod by drilling along the axis of the cut piece of the metal rod and leaving a tapered end at bottom of each piece of the metal rod.
  • the center bore is achieved through meticulous drilling, resulting in a hollow core within the threaded insert.
  • the bore not only refines the insert's structure but also serves functional purposes, enhancing versatility and facilitating ease of installation in various applications.
  • a female thread is tapped in the bore of each pieces.
  • the female thread is tapped in the bore cavity of each piece of the metal rod up to a point where the tapered end starts.
  • Such precision threading process adds functionality to the threaded insert, enabling it to securely engage with corresponding male threads.
  • the integration of a female thread ensures compatibility and seamless connection within a variety of applications.
  • tightening tool slot is cut in each piece of the metal rod.
  • the tightening tool slot is cut in each piece of the metal rod at a top end along the diameter of the piece.
  • the pieces of metal rod are designed for easy installation or removal using a screwdriver in the tightening tool slot.
  • two or more wedge-shaped slots are cut on the external surface.
  • two or more wedge-shaped slots are cut on the external surface along the axis of the piece of metal rod, wherein each of the wedge-shaped slots comprises a sharp straight edge on the right and a gradual slant edge on the other side.
  • two or more diametrical slits are cut at the bottom end. In one embodiment, two or more diametrical slits are cut at mutually equal distances avoiding the diametrical Line of the tightening tool slot on the top end.
  • Figure 9 is an exemplary method of the present disclosure and illustrates various steps of the method (330) for surface to surface direct contact-based joinery installation.
  • the method (330) comprises one or more blocks to be performed for surface direct contact-based joinery installation.
  • the order in which the method (330) is described is not intended to be construed as a limitation, and any number of the described method blocks can be combined in any order to implement the method. Additionally, individual blocks may be deleted from the methods without departing from the spirit and scope of the subject matter described herein.
  • a blind hole is drilled on a surface.
  • the blind hole is drilled to keep the front exposed surface intact with no visibility of the hole behind.
  • Such configuration provides aesthetic requirement of the joinery while cladding a surface with another surface.
  • the threaded insert having wedge shaped longitudinal slots on the outer surface, can be directly screwed in into the blind hole with the help of a throttled drive with very slow RPMs to simultaneously tap the threads while screwing the insert, using the insert itself as the tapping tool.
  • female threads are engraved in the hole.
  • female threads are engraved in the hole by using appropriate tapping tools or threading methods for cutting or engraving threads in respective materials of surfaces.
  • the threaded insert is gently screwed into the pre-threaded hole.
  • a load bolt having tapered bottom end is screwed in.
  • a load bolt that is the bolt of requisite length having a tapered tip in the bottom end is screwed in so that the tapered tip of the bolt can enter into the tapered end of the threaded insert thereby exerting an outward force on the walls of the housing in the threaded insert from inside, thereby causing the same to dilate at the cut slits in the bottom of the insert, and thereby locking the insert at the position it is inside the surface.
  • a washer is put below the load bolt.
  • the load bolt is unscrewed and passed through the hole of appropriate diameter in the other surface required to be joined with the insert bearing surface, optionally keeping a washer between the load bolt and the other surface for better fit, and again screwing in the same into the threaded insert till it is fully tight so as to give an absolutely secured joint between the two directly contacting surfaces.
  • Figure 10 is an exemplary method of the present disclosure and illustrates various steps of the method (350) for surface to surface suspended indirect contact -based joinery installation.
  • the method (350) comprises one or more blocks to be performed for surface to surface suspended indirect contact -based joinery installation.
  • the order in which the method (350) is described is not intended to be construed as a limitation, and any number of the described method blocks can be combined in any order to implement the method. Additionally, individual blocks may be deleted from the methods without departing from the spirit and scope of the subject matter described herein.
  • a blind hole is drilled on a surface.
  • the blind hole is drilled to keep the front exposed surface intact with no visibility of the hole behind.
  • Such configuration provides aesthetic requirement of the joinery while cladding a surface with another surface.
  • the threaded insert having wedge shaped longitudinal slots on the outer surface, can be directly screwed in into the blind hole with the help of a throttled drive with very slow RPMs to simultaneously tap the threads while screwing the insert, using the insert itself as the tapping tool.
  • female threads are engraved in the hole.
  • female threads are engraved in the hole by using appropriate tapping tools or threading methods for cutting or engraving threads in respective materials of surfaces.
  • the threaded insert is gently screwed into the pre-threaded hole.
  • a load bolt having tapered bottom end is screwed in.
  • a load bolt that is the bolt of requisite length having a tapered tip in the bottom end is screwed in so that the tapered tip of the bolt can enter into the tapered end of the threaded insert thereby exerting an outward force on the walls of the housing in the threaded insert from inside, thereby causing the same to dilate at the cut slits in the bottom of the insert, and thereby locking the insert at the position it is inside the surface.
  • a tensioner or spring housing the load bolt is put.
  • the load bolt is unscrewed and passed through the hole of appropriate diameter in the other surface required to be joined with the insert bearing surface, keeping a tensioner between this other surface and the insert bearing surface. Further, the load bolt is screwed into the threaded insert till it is fully tight, simultaneously compressing the tensioner till it exerts the requisite rebounding force on the other surface, so as to give an absolutely secured joint between the two indirectly contacting surfaces, duly suspended due to the tensioner in between the two surfaces.
  • the inner and outer threads of the threaded insert being in opposite directions serves as a locking mechanism while unscrewing the load bolt because the bolt and insert always move in mutually opposite directions.
  • the insert can be locked at any depth in the hole as desirable, keeping gap inside to accommodate the tip of the load bolt protruding out while tightening into the insert, again safeguarding the substrate below.
  • this variant can be used to impart the properties of the most stable materials like stainless steel by making the inserts from them and fitting it into any kind of lesser stable materials irrespective of whether they can threadable and/or can sustain threads, for e.g. in aluminium / cast iron / copper / brass / wood / stones or practically any solid substance.
  • inner and outer threads of the threaded insert being in same direction serves as a locking mechanism while screwing-in the load bolt because the bolt and insert always move in mutually same directions.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Abstract

La présente invention concerne un insert fileté pour le vissage à la machine. L'insert fileté comprend un boîtier cylindrique ayant une extrémité supérieure, une extrémité inférieure et un alésage central à travers celui-ci, l'extrémité inférieure étant effilée et ledit boîtier cylindrique comprenant au moins deux fentes diamétralement découpées au niveau de l'extrémité inférieure. L'insert fileté comprend en outre une surface interne de l'alésage central ayant des filetages femelles dans le sens des aiguilles d'une montre ou dans le sens inverse des aiguilles d'une montre sur toute la longueur de l'alésage central jusqu'à une première partie précédant l'extrémité inférieure. L'insert fileté comprend une surface externe du boîtier cylindrique ayant des filetages mâles dans le sens des aiguilles d'une montre ou dans le sens inverse des aiguilles d'une montre sur toute la longueur du boîtier cylindrique jusqu'à un point de départ de l'extrémité inférieure, et ayant éventuellement deux fentes en forme de coin ou plus gravées verticalement sur la surface externe du boîtier cylindrique. La présente invention concerne également un procédé de fabrication et d'installation de l'insert fileté.
PCT/IN2024/051426 2023-07-31 2024-07-31 Insert fileté pour vissage à la machine Pending WO2025027650A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN202331051450 2023-07-31
IN202331051450 2023-07-31

Publications (1)

Publication Number Publication Date
WO2025027650A1 true WO2025027650A1 (fr) 2025-02-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2024/051426 Pending WO2025027650A1 (fr) 2023-07-31 2024-07-31 Insert fileté pour vissage à la machine

Country Status (1)

Country Link
WO (1) WO2025027650A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2260791A (en) * 1991-10-22 1993-04-28 Psm Int Plc Screw threaded inserts

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2260791A (en) * 1991-10-22 1993-04-28 Psm Int Plc Screw threaded inserts

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