SI26625A - System for attaching and holding the interchangeable shank in the handle of multi-purpose tools - Google Patents

Abstract

The subject of the invention is a system for fastening and holding an interchangeable shaft in the handle of multi-purpose tools, wherein the interchangeable shaft (3) is secured against falling out in the axial direction by a combination of an inserted spring element (5) in the sleeve (2) in the handle (1) and a groove (4) at the beginning of the interchangeable shaft (3), and in the rotational direction by the hexagonal (hexagonal) shape of the shaft (3) and the sleeve (2). The system is also useful for a multifunctional interchangeable shaft with a functional one-sided or two-sided end (either for screwing or other functional tasks) and for a variable type of handle with an opening into which the system can be implemented, which also has a certain additional function that it can perform, e.g. a ratchet.

Description

SYSTEM FOR ATTACHING AND HOLDING THE INTERCHANGEABLE SHAFT IN THE HANDLE OF MULTI-PURPOSE TOOLS

The subject of the invention is a system for fastening and holding an interchangeable shaft in the handle of multi-purpose tools, wherein the interchangeable shaft is protected against falling out in the axial direction by a combination of a spring element inserted in the sleeve in the handle and a groove at the beginning of the interchangeable shaft, and in the rotational direction by a hexagonal (hexagonal) shape of the shaft and sleeve. The system is also useful for a multifunctional interchangeable shaft with a functional one-sided or two-sided end (either for screwing or other functional tasks) and for a variable type of handle with an opening into which the system can be implemented, which also has a certain additional function that it can perform.

The technical problem that the present invention successfully solves is the implementation of a system for attaching and holding an interchangeable shaft in a handle, in the sense of a generic retaining device, in such a way that it is interchangeable between multi-purpose screwdrivers, blades, tools and insulated shafts with different screwdriving profiles, in connection with different handle shapes used for transmitting torques during operation, and in addition, some embodiments of the system also have added functionality, in which the system can be implemented in such a way as to improve its functionality, compatibility and universality, as well as economy.

The invention is based on the goal of developing an improved fastening and retention system that would be compatible with various multi-function tools and could be implemented in other functions with additional functionality.

The aim of the invention is to develop a fastening and retaining system that can be used with various multifunctional interchangeable tools that are compatible with various types of handles that themselves have a generic function in an economically universal way, so that it can be used with multifunctional interchangeable screwdriver shanks, blades, tools and insulated interchangeable screwdriver shanks in handles that have different shapes and separate functions, which means improved functionality, compatibility and universality.

According to the present invention, a handle with a hexagonal groove is provided, into which a sleeve is inserted, and a spring element is inserted therein, which in combination provide locking against axial ejection of the shaft. The sleeve in the direction of rotation enables the transfer of torque from the handle to the inserted shaft, which has a certain tip (screw) profile, blade or other functional tool.

The attachment or holding of interchangeable stems with a single-sided tip for screwing purposes in a handle is already known, and can be found in the following existing patents - US20200008854A1, US20110000345A1, US20100294091A1. Each of these embodiments has its own form of stem locking solution, but in the mentioned patents there is no additional function, especially not one that would also connect the two-sided stems.

Devices for retaining interchangeable shanks with double-ended tips used for screwdriving purposes are already known and can be found under patents US6202512B1, US20120085665A1, US20100269263A1, which use a special locking mechanism in the middle of the blade, but are limited by the length of the shank, as they lock/retain at a certain point (recess) in the middle of the shank, meaning that they are limited by the length looking from this point into the handle.

Devices for retaining interchangeable single-sided shanks with a specific screwing profile or tip, which are insulated and therefore suitable for use under electrical voltage (they comply with the IEC 60900 standard) and have a shaped part for transmitting torque, can also be found in the following patents DE202010012971U1, DE102012002849B3, DE102005012729B4. All of the patents listed have their own unique way of mechanically locking the shanks.

All of the above-mentioned systems have their own way of locking the stems and allow the use of only a certain type of stem (either interchangeable single-sided, interchangeable double-sided or interchangeable insulated stem). The system according to the present invention, due to its unique shape, design and composition, allows the use of all of the aforementioned stems/blades with different handles. It therefore combines all the functionalities of all of the aforementioned stems into one system, which can be upgraded with an additional function (e.g. a handle with adjustable torque, a handle with a ratchet, etc.).

Devices for holding interchangeable single-sided shanks that can be used as a conventional screwdriver handle, and when rotated 90 degrees can also be used as a screwdriver with a ratchet mechanism, which can be found under patent - US2012022222524A1.

The system according to the present invention upgrades existing inventions, as it can use double-sided stems, single-sided stems or other devices.

Devices for retaining interchangeable single-sided stems that fit into handles also have a secondary function, such as adjustable torque, and can be found under patent - DE202011110041U1.

The present invention builds on this by using a single-sided, double-sided or even insulated stem.

The system for securing and holding an interchangeable shaft in the handle of multi-purpose tools is a combination of an inserted hexagonal sleeve in the handle, where the hexagonal sleeve has a spring element inserted in the part in the handle, which is engaged in a groove at (one of) the ends of the interchangeable hexagonal-shaped shaft. It holds the shaft with a force that allows for smooth use of the various shaft functions or screwing, and a force that, at a certain extraction force (in the axial direction), allows the user to quickly change between different shafts and profiles. Due to the placement of the groove at the end of the interchangeable hexagonal-shaped shaft, it is possible to use the system in all the tools described above not only with single-sided shafts, but also with double-sided shafts and also with single-sided shafts with a certain insulated shaft and a different screwing profile, which was not possible in previous designs.

The invention will be explained in more detail based on an exemplary embodiment and the accompanying drawings, which show:

picture 1, 2 basic illustration of the assembled system of a double-sided interchangeable stem and handle for the system according to the invention; picture 3, 4 system composition and handle components according to the invention; figure 5, 5a, 6 longitudinal cross-section of the assembled system of the double-sided interchangeable stem and the handle for the interchangeable stem system in the locked position; picture 7 cross-section of the inserted interchangeable system in the sleeve, illustrating the fit of the hexagonal surfaces, which allow for maximum torque transfer from the sleeve to the shaft; figure 8, 8a cross-section of the assembled system of the double-sided interchangeable stem and the handle for the interchangeable stem system in the locked position; figure 9,10 cross-section of the handle with the sleeve inserted without the interchangeable stem inserted; picture 11, 12,13 hexagonal sleeve with inserted spring element; picture 14, 15,16 handle with inserted interchangeable double-sided shaft in three different lengths;

picture 17, 18 handle with inserted interchangeable single-sided stem with stem diameter much larger at the front; picture 19 cross-section of the handle with an inserted interchangeable single-sided shaft with a shaft diameter that is much larger at the front; picture 20, 21 handle with inserted single-sided shank with shank diameter much larger at the front and with awl attachment and magnetic holder for various tips; picture 22, 23 handle with inserted replaceable one-sided sheathed (insulated) shaft for working under electrical voltage; picture 24 handle with inserted replaceable one-sided sheathed (insulated) shaft for working under electrical voltage in longitudinal section; figure 24a Detail of the handle with an inserted replaceable one-sided sheathed (insulated) shaft for working under electrical voltage in longitudinal section; picture 25, 26 cross-section of the handle with an inserted replaceable one-sided sheathed (insulated) shaft for working under electrical voltage; picture 27 handle for interchangeable stem system; picture 28, 29, 30 a handle for the system according to the invention and an adjustable torque for screwing with a precisely defined force (which can be set in advance); picture 31 handle for the interchangeable stem system and the interchangeable stem system with ratchet function in axonometric view; picture 32 handle for the interchangeable stem system and the interchangeable stem system with ratchet function in side view;

Figure 33: Handle for the interchangeable stem system and the interchangeable stem system with ratchet function in cross-section from the side with inserted interchangeable stems on both sides;

Figure 34: Cross-section of the handle for the interchangeable stem system;

Figure 35: Cross-section of the handle for the system for interchangeable stems with ratchet function;

Figure 36 Cross-section of the handle for the interchangeable stem system and the interchangeable stem system with ratchet function.

Figures 1 and 2 show a basic view of the system of a two-sided interchangeable stem and handle with a system according to the invention, while Figures 3 and 4 show individual components of the system according to the invention.

A hexagonal opening 8 is made in the handle 1, into which a sleeve 2 of hexagonal shape with an opening 7 is inserted, whereby the sleeve 2 has a groove 6 at the end, into which a spring element 5 is inserted.

Figures 5, 5a and 6 show a basic cross-sectional view of the assembled system with a double-sided interchangeable hexagonal shaft 3 in a hexagonal socket 2 and a handle 1, whereby the shaft 3 has a profile 3a for PH2 screwing (cross profile 2) on one side, and a profile 3b for PH1 screwing (cross profile 1) on the other side. The shaft 3 has grooves 4 formed at both ends, whereby the groove 4 in cooperation with the spring element 5 enables the retention of the shaft 3 in the axial direction relative to the handle 1, so that the shaft 3 is fixed in the handle 1 by the spring element 5, which is inserted into the socket 2 and lies in the groove 4, as shown in Figure 6.

Figures 7, 8 and 8a show a cross-section of the assembled system with a double-sided interchangeable shaft, with Figure 7 showing how the hexagonal shaft 3 most effectively transfers torque or other operations from the handle 1 to the shaft 3, as the largest part of the surface engages with each other and enables stable operation or screwdriving.

A cross-section of the handle 1 with the inserted sleeve 2 and spring element 5 is shown in Figures 9 and 10, while Figures 11, 12 and 13 show the sleeve 2 with the inserted spring element 5.

Figures 14, 15 and 16 show the handle 1 with inserted interchangeable shafts 3, 9 and 10 of different lengths with different profile tips 3c 1.2x6 (flat profile), 9 PH2 (cross profile 2) and 10a T25 (Torx profile). Such an embodiment is possible only with the system according to the invention, in which the groove 4 is made at the end at the end of the shaft 3.

In the already existing versions described above, which have a mechanical lock that holds the stem in the handle, an additional locking operation is required, which is not the case with the system according to the invention, since it is automatically triggered and locked when the stem 3 is inserted into the handle 1. In addition, the already known embodiments, which have a groove for holding the stem in the middle, are limited by the length of the stem, since in the case of a longer stem, the locking area would not align with the groove on the stem and therefore it would not be possible to fix it in that area.

The method of manufacturing hexagonal stems is also very simple, as only by turning and profiling we can process both tips with grooves where the system locks, and we do not need additional operations, such as with a round stem, where we have to manufacture a kind of anchor that transmits torque, but which, due to the smaller contact surface, withstands less torque (it may break sooner).

Since the present invention allows the use of the stems on both sides, we can have twice as many profiles as with the single-sided version, making our work more efficient. Stems with handles also take up less space, which is also more advantageous from an economic point of view, as we also save on material.

Due to the universality of the system, we can also use single-sided stems in the same system, which allows us to increase the functionality and purpose of the system for stems with profiles that, due to their oversized dimensions (e.g. flat stem 11a with 1.2X8 attachment in Figure 17, or other special larger attachments), do not fit into the sleeve opening. This allows us to insert various tools into the system, such as an awl, chisel, magnetic attachment, etc., shown in Figures 18, 19 and 20. A stem with a magnetic holder 13a (C6.3 or ¹ /4) can also be used and allows the user to use a holder with attachments of various profiles (C6.3 or %) for shorter and faster tasks, which is evident from the illustration in Figure 21. Since the system according to the invention can also be used with larger profiles or tools, this increases the functionality and universality of the system.

With the system for attaching and holding the interchangeable shaft in the handle of multi-purpose tools, we can also use purpose-made and injected insulated shafts that are compliant and 100% tested according to the IEC 60900 standard and enable work under electrical voltage (Figure 22).

The shafts are made in the SLIM version, which means that they are narrower at the beginning of the insulated part and allow access to narrow areas that would not be reached with classic insulated screwdrivers.

A screwdriver with a purpose-made and injection-molded insulated shaft is shown in Figures 24, 24a, 25 and 26. The metal part 15 of the shaft with the insulating part 14 is designed in such a way that it can transfer torque to the hexagonal shape of the injection-molded part, from which it is then transferred to the hexagonal shape of the locking system and to the handle, with which the user can achieve and exceed standard torques for various profiles.

Because the system can be very slim/compressed, it can also be inserted into other systems that provide us with an additional function, so it is not only useful for holding single-sided or double-sided screwdriver shafts and similar tools, but it can also be used with handles where the torque can be pre-set, and when the torque is set and achieved, it prevents further screwing in the rotational direction, which means that no further torque can be achieved.

Such a handle 17 is shown in figures 28, 29 and 30. With it, the desired or specified (from the side of the element being screwed, since for certain elements the fastening torques are precisely specified) torque that holds the stem 7 with the spring element 5 in the sleeve 2 can be set with the knob 19.

Due to the ease of holding the single-sided or double-sided stems in the invention according to the system, the handle (20) can be adapted to combine two systems in one handle, so that the handle is used as a screwdriver at one end and as a ratchet at the other.

A system for retaining interchangeable stems, made of metal or ZAMAC, and a spring (which saves space and allows the ratchet to work or flow), allows the insertion of a stem that performs the holding function. The system or elements around this metal bushing can be used as a ratchet system, which is shown in figures 31, 32, 33, 34, 35 and 36.

The system for attaching and holding an interchangeable shaft in the handle of multi-purpose tools can be used with a variety of different shafts due to its universality: regular, single-sided or double-sided insulated, and those with special tools/profiles.

The main advantage of the system is that, due to its compactness, it can be integrated into a variety of other handles/devices that have additional functions, such as a handle with adjustable torque, a handle with preset torque or a handle with a ratchet, and other slimmer or thicker handles.

In this way, one set of interchangeable stems can be used with all the systems listed above, otherwise we would need a separate device or special handles and stems for each system or task (which is currently already present on the market). In addition, we save space (instead of having a separate tool for each dimension and for each handle that has an additional function, we can have everything in one), money and of course manufacturing time, as it is very simple and fast, and last but not least, it is also more ecological.

Because the system is so universal, it can be used with all of the above-mentioned stem designs - double-sided stems made of hexagonal material, regular single-sided stems made of hexagonal material, insulated stems suitable for working under electrical voltage.

The handles have a hexagonal opening into which a system is inserted, which is pre-assembled with a spring, which expands when the stem is inserted into the system until it locks it when it jumps into the recess.

Due to the shape of the opening and the hexagonal system, we can transmit torques in both directions, ensuring that we can transmit the maximum torque that the operator can transfer to the handle, from the handle to the system, from the system to the stem, and from the stem to the profile, which transfers it directly to the screw.

Claims (5)

PATENT APPLICATIONS 1. A system for fastening and holding an interchangeable shaft in the handle of multi-purpose tools, characterized in that it represents a combination of a hexagonal sleeve (2) inserted into a hexagonal opening (8) of the handle (1) and one of the ends of an interchangeable shaft (3) of hexagonal shape, wherein the hexagonal sleeve (2) has a spring element (5) inserted into a part in the handle (1), which is engaged in a groove (4) at one of the ends of the interchangeable shaft (3) of hexagonal shape. 2. A system for fixing and holding an interchangeable shaft in the handle of multi-purpose tools, according to claim 1, characterized in that interchangeable shafts (3, 9, 10) of different lengths with different profile tips (3c) 1.2x6 (flat profile), 9 PH2 (cross profile 2) and 10a T25 (Torx profile) are inserted into the handle (1). 3. A system for fastening and holding an interchangeable shaft in the handle of multi-purpose tools, according to claim 1, characterized in that the purpose-made and injection-molded insulated shaft, which is compliant and 100% tested according to the IEC 60900 standard and enables work under electrical voltage, is a screwdriver, in which the purpose-made metal part (15) of the interchangeable shaft with the injection-molded insulating part (14) is designed in such a way that it can transfer torque to the hexagonal shape of the shaft to the hexagonal shape of the injection-molded part (14), from which it is then transferred to the hexagonal shape of the locking system and to the handle (1), with which the user can achieve and exceed standard torques for various profiles. 4. A system for fastening and holding an interchangeable shaft in the handle of multi-purpose tools, according to claim 1, characterized in that it can also be used with a handle where the torque can be set in advance, and when the torque is set and achieved, it prevents further screwing in the rotational direction, wherein a mechanism is embedded in the handle (17) in which the desired or specific torque can be set with a knob (19), which holds the shaft (7) with the spring element (5) in the socket (2). 5. A system for attaching and holding an interchangeable shaft in the handle of multi-purpose tools, according to claim 1, characterized in that two systems are combined in the handle (20), so that the handle is used as a screwdriver at one end and as a ratchet at the other.