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
  • F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
  • F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
  • F16B31/027—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load with a bolt head causing the fastening or the unfastening tool to lose the grip when a specified torque is exceeded

Definitions

• Threaded fastener FIELD OF THE INVENTION The invention relates to the field of fasteners, and in particular to a threaded fastener such as a bolt or a screw.
• Threaded fasteners such as bolts or screws, are common components for connecting components.
• it is necessary to ensure the tightness of the threaded connection to avoid loosening of the connection and on the other hand, it is necessary to avoid applying excessive torque to the threaded fastener to cause damage to the threaded fastener itself or fastening with the thread. Damage to the connected components of the piece. Therefore, when screwing the threaded fastener, it is necessary to control the appropriate torque.
• the corresponding predetermined torque value is usually given in the instruction manual of the product to be connected by the threaded fastener.
• the user has to install by means of a special tool, which leads to an increase in installation time and cost, which is not desirable.
• the present invention provides a torque-fixing threaded fastener in which the torque applied to the threaded fastener does not exceed its predetermined torque, thereby avoiding excessive torque and causing the threaded fastener.
• the thread is damaged or damaged associated with the threaded fastener.
• a threaded fastener comprising: a ratchet mechanism comprised of a pawl and a ratchet, wherein the pawl has a pawl member having a wheel that engages the pawl member a threaded screw coupled to the pawl or ratchet of the ratchet mechanism; wherein when the user applies a torque to the ratchet mechanism to screw the threaded fastener, if the torque is less than the predetermined torque, the pawl The piece cannot slide over one or more of the teeth so that the user's screw can drive the screw to rotate; if the torque is greater than or equal to the predetermined torque, the pawl member will slide over all the teeth, thereby making the user's screwing impossible Further driving the screw to rotate.
• the ratchet mechanism serves to limit the transmission to the screw. The effect of high torque, thereby ensuring that the threaded fastener of the present invention is maintained at a predetermined torque after tightening, without the need for tools such as a torque wrench or a torque screwdriver.
• the ratchet has a body portion having a cavity, the inner periphery of the cavity forming a tooth, and the pawl member of the pawl being received in the cavity
• the middle meshes with the teeth, whereby the ratchet mechanism is formed as an internal meshing ratchet mechanism.
• the externally engaged ratchet mechanism is equally applicable to the threaded fastener of the present invention by using a ratchet mechanism to control the maximum torque of the threaded fastener.
• the pawl has a lumen surrounded by a bottom wall and a side wall extending perpendicular to the bottom wall, the pawl member being located on the bottom wall, the inside of the side wall
• the cylindrical portion is such that the inner cavity is cylindrical, and the body portion of the ratchet has a cylindrical outer contour, whereby the body portion of the ratchet is housed in the inner cavity of the pawl, and the pawl member of the pawl is received in the concave cavity.
• the inner side of the side wall of the inner cavity of the pawl is formed with an inwardly projecting engagement portion, and the outer periphery of the main body portion of the ratchet is formed with a ring shape.
• the groove, the engaging portion is engaged in the groove to engage the pawl and the ratchet.
• the pawl and the ratchet may also adopt other mutual cooperation means, for example, an annular groove may be formed on the inner side of the side wall of the inner cavity of the pawl, and the main portion of the ratchet An outwardly projecting engaging portion is formed on the outer periphery.
• the outer periphery of the body portion of the ratchet is formed with a concave guide groove extending perpendicularly to the groove along which the engaging portion slides to form a card. Fit into the groove.
• the ratchet of the threaded fastener of the present invention has a guide groove, it is possible to smoothly press the pawl and the ratchet with each other by means of a relatively small pressing force.
• other guiding methods or even no guiding structures may be employed in the present invention.
• the pawl is integrally molded from a plastic material.
• the pawl of the present invention is made of a plastic material, integral molding can be performed at low cost, and the pawl member of the pawl has appropriate elasticity and rigidity so that the pawl is Pawl and spine After the teeth of the wheel are engaged, by means of the rigidity of the pawl member, when the torque of the screwing threaded fastener is less than the predetermined torque, there is no relative rotation between the pawl and the ratchet; by virtue of the elasticity of the pawl member, When the torque of the threaded fastener is greater than or equal to the predetermined torque, the pawl member is elastically deformed such that relative rotation between the pawl and the ratchet occurs such that the torque transmitted to the screw does not exceed the predetermined torque.
• the pawl may also be made of
• the screw is coupled to the ratchet and the screw and the ratchet have a common axis of rotation.
• the screw and the ratchet can be made of the same material, such as metal, to facilitate the connection.
• the screw can also be designed to be coupled to the pawl.
• the ratchet has a hollow boss for connecting the screw to the body portion, the inside of the boss having an internal thread for threadingly coupled to the screw .
• the connection can be easily performed.
• the screw and the ratchet may be joined by other means such as welding.
• the ratchet and the screw are integrally formed as one piece.
• the ratchet of the threaded fastener of the present invention is integrally formed with the screw, it can be manufactured at low cost, and the assembly step between the two can be omitted.
• the screw and the ratchet may also be separate components.
• the threaded fastener can be implemented as a screw or bolt.
• Figure 1 is a schematic illustration of a threaded fastener in accordance with a preferred embodiment of the present invention wherein the pawl and ratchet of the ratchet mechanism of the threaded fastener are not yet assembled.
• FIG. 2 is a schematic illustration of a threaded fastener in accordance with a preferred embodiment of the present invention, as shown in FIG. 1, wherein the pawl and ratchet of the ratchet mechanism of the threaded fastener have been assembled.
• FIG. 3 is a perspective view of a pawl portion of a threaded fastener in accordance with a preferred embodiment of the present invention.
• FIG. 4 is a perspective view of a ratchet portion of a threaded fastener in accordance with a preferred embodiment of the present invention.
• Figure 5 is a perspective view of another perspective view of the ratchet portion of the threaded fastener of Figure 4 in accordance with a preferred embodiment of the present invention.
• Figure 6 is a schematic view showing the engagement of the pawl and the ratchet of the threaded fastener in accordance with a preferred embodiment of the present invention.
• BEST MODE FOR CARRYING OUT THE INVENTION In order to clarify the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail by the following examples.
• a threaded fastener in accordance with a preferred embodiment of the present invention includes a pawl 1, a ratchet 2 and a threaded screw 3.
• the pawl 1 and the ratchet 2 form a ratchet mechanism for defining the maximum torque applied to the screw 3.
• the screw 3 is shown coupled to the ratchet 2 and the screw 3 and the ratchet 2 have a common axis of rotation.
• the screw 3 can also be implemented to be coupled to the pawl 1.
• the term "connected” includes both the case where the two parts are mechanically connected, and the case where the two parts/parts are formed as a single unit.
• a pawl 1 of a threaded fastener includes a bottom wall 13, a side wall 15 extending perpendicularly to the bottom wall 13, and a pawl member formed on the bottom wall 13. 1 1.
• the bottom wall 13 and the side wall 15 enclose an inner cylindrical cavity 17 having an inner side formed on the inner side of the side wall 15 with an inwardly projecting engaging portion 151 for corresponding to the ratchet The groove (described below) is snapped.
• the ratchet 2 includes a main body portion 21, and a hollow boss 23 connected to the main body portion 21 for connecting the screw 3.
• the inside of the hollow boss 23 has an internal thread for screwing the screw 3.
• the main body portion 21 has a cavity 21 1 (see FIG. 5), and the inner periphery of the cavity 21 1 is formed with teeth 213. Further, an outer periphery of the main body portion 21 is formed with: an annular groove 215 (see FIG.
• the guiding groove 217 may be arranged to be gradually shallower in the direction of the groove 215, thereby facilitating the withdrawal of the pawl 1 from the ratchet 2 after the pawl 1 and the ratchet 2 are mounted in position.
• FIG. 6 there is shown a schematic view showing the engagement of the pawl and the ratchet of the threaded fastener in accordance with a preferred embodiment of the present invention.
• the pawl member 11 of the pawl 1 is received in and engaged with a cavity 21 1 of the ratchet 2, the body portion 21 of the ratchet 2 having a cylindrical outer contour It is housed in the cylindrical inner cavity 17 of the pawl 1, whereby the pawl 1 and the ratchet 2 are accommodated with each other, and the pawl member 1 1 of the ratchet 1 engages the teeth 213 of the ratchet 2, thereby causing the pawl 1 and the ratchet 2 together form an internal engagement ratchet mechanism.
• the user when the user applies a torque to the ratchet mechanism of the threaded fastener to screw the threaded fastener, in particular, for the embodiment illustrated herein, the user can screw the side wall 15 of the pawl 1 Rotating the threaded fastener from the outside, at the beginning, since the thread of the screw 3 of the threaded fastener and the thread on the component to be connected or the corresponding nut are not yet locked, only a small amount of torque is applied at this time.
• the threaded fastener can be screwed.
• the applied torque is less than the predetermined torque. Since the pawl member 11 has a certain rigidity, the magnitude of the applied torque is insufficient to cause the pawl member 11 to be sufficiently elastically deformed.
• One or more gear teeth 213 are slid over the pawl 2 (e.g., as shown in Figure 6), whereby the user's screwing can cause the screw 3 to rotate the upper fastener.
• the required tightening torque is also constantly increased.
• the pawl member is sufficiently elastically deformed to slide over all of the teeth 213, in which case Further, the user's further screwing can only cause mutual rotation between the pawl and the ratchet, and the screw 3 cannot be further rotated, so that the torque applied to the screw 3 is not greater than the predetermined torque.
• the predetermined torque of the fastener can be adjusted, for example, by adjusting the number, shape, material of the pawl members; the shape of the teeth; the mutual positional relationship of the pawl members with the teeth.
• the pawl 1 can be integrally molded from a plastic material in the present invention.
• the ratchet 2 is screwed to the screw 3, however, in the present invention, the ratchet 2 and the screw 3 may also be implemented as an integrally formed integral member such as a single member molded of metal.
• the threaded fastener of the present invention is embodied as a screw structure, however, it is obvious that it can also be implemented as a bolt structure.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Prostheses (AREA)
• Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
• Bolts, Nuts, And Washers (AREA)

Priority Applications (2)

Applications Claiming Priority (1)

Publications (1)

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Family Applications (1)

Country Status (2)

Cited By (3)

Families Citing this family (5)

Citations (5)

Family Cites Families (3)

• 2012
  • 2012-09-12 CN CN201280075792.8A patent/CN104641125B/zh not_active Expired - Fee Related
  • 2012-09-12 WO PCT/CN2012/081276 patent/WO2014040238A1/fr not_active Ceased

Patent Citations (5)

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