TWI623390B - Multi-section torque screwdriver - Google Patents

Abstract

A torque driver includes: a body having an assembly portion; a cam rotatably disposed at the assembly portion, the cam having a pivot point that forms at least two unequal distances from the cam surface; and a clutch mechanism Disposed at the assembly portion and not at the same end as the cam; and an elastic member disposed in the assembly portion between the cam and the clutch mechanism. When the cam rotates about the pivot point, the distance is interchanged, and the elastic member is given a force to the clutch mechanism. In this way, the torque driver adopts a cam structure, and two or more stages are planned, and even if it is not visually detected, different torque values can be adjusted, and the disadvantages of the prior art are effectively solved.

Description

Multi-section torque screwdriver

This invention relates to the field of torque regulation of tools, and more particularly to a multi-section torque driver.

There are many kinds of tools, and the commonly used tools are nothing more than wrenches and screwdrivers. In the case of a screwdriver, it is usually a certain force acting on a screw-like fastener to drive the fastener to perform a locking or unscrewing operation, so the force transmitted by the screwdriver is also called torque or torque.

The torque of some screwdrivers is not adjustable. For example, a handle covers a part of a straight rod, and the exposed end of the straight rod has a functional shape such as a word or a cross. When the handle receives an input of an external force, the exposed end of the straight rod drives the fastener to be locked or unscrewed, and the force is not changed by any adjustment during the transmission of the force from the handle to the fastener through the straight rod, so the handle The input value is roughly equal to the torque value of the straight rod.

The torque of some screwdrivers can be adjusted. For example, in the torque screwdriver disclosed in the new Taiwan Patent No. M366449, the handle is sleeved on the outside of the body, and the body has a chamber for assembling a clutch mechanism, an elastic member and a Adjustments. The clutch mechanism is composed of a guide seat, a plurality of beads and a linkage seat. The beads are between the guide seat and the linkage seat, ensuring that the linkage seat can both drive the guide seat to rotate in the same direction and can be displaced relative to the body. Keep away from the guide. The two ends of the elastic member respectively abut against the connecting seat and the adjusting member, and push the movable seat to move toward the guiding seat to be a normal state. The adjusting member maintains a screwing relationship with the body, and can change the force of the elastic member to be applied to the connecting seat to be large and small.

When the subhead is inserted into the guide seat, the linkage seat suppresses the guide seat with the driver's head lock A solid fastener that feeds back a reaction force through the screwdriver head to counteract the torque transmitted by the linkage to the guide seat via the bead. When the reaction is greater than the torsion force, the bead body generates a tripping behavior between the guide seat and the linkage seat, interrupting the transmission of the torsion force, so that the screwdriver is idling relative to the fastener to avoid unnecessary damage to the fastener.

However, the adjusting member screwing body is loose, causing the elastic member to apply a variable force to the interlocking seat, and the coupled guiding seat outputs an unstable torque value.

Secondly, the end surface of the body is engraved with a plurality of scales, and the adjustment member has an indication end, and the indication end is aligned with any scale by visual inspection to understand the torque value of the elastic member applied to the clutch mechanism. However, the visual method is limited by the angle of the line of sight, and there is a certain error in the torque value.

Therefore, how to improve the torsion-inducing structure of the torsion force becomes an urgent problem to be solved by the present invention.

In view of this, the present invention provides a new torsion driver, the main purpose of which is to adopt a cam structure and plan a plurality of stages, and even if the visual method is not used, different torque values can be adjusted to effectively solve the disadvantages of the prior art.

For the above object, the torque driver of the present invention comprises: a body having an assembly portion; a cam rotatably disposed at the assembly portion, the cam having a pivot point, the shaft point forming at least two of the cam surface An equal distance; a clutch mechanism disposed at the assembly portion, the clutch mechanism and the cam are not at the same end of the assembly portion; and an elastic member disposed at the assembly portion, the elastic member being between the cam and the clutch mechanism.

When the cam rotates around the pivot point, the distance is interchanged, and the elastic member is determined. Give the clutch mechanism a force.

Thus, the torque driver of the present invention adopts a cam structure, and the force of at least two stages is planned, and the torque value of the torque driver is changed through the clutch mechanism. Even without visual inspection, different torque values can be adjusted to effectively solve the drawbacks of the prior art.

The above and other objects, features, and advantages of the present invention will become more apparent and understood.

10‧‧‧Torque screwdriver

11‧‧‧ recess

12‧‧‧Ontology

13‧‧‧ pivotal department

14‧‧‧Top cover

15‧‧‧Deduction

16‧‧‧ bottom cover

17‧‧‧Card Department

18‧‧‧Collection room

20‧‧‧ Assembly Department

22‧‧‧Operating room

24‧‧‧Restricted holes

26‧‧‧Working cabin

30‧‧‧ cam

31, 33, 34, 36‧‧‧ distance

32‧‧‧ pivot point

38‧‧‧ surface

40‧‧‧Main button

41, 51‧‧ ‧ pocket

42‧‧‧Axis

43, 53‧‧‧ activity column

44, 46‧‧‧Multi-column

45, 55‧‧‧ compression spring

47, 52‧‧‧ expansion holes

48, 54‧‧‧Multilateral holes

50‧‧‧ secondary button

60‧‧‧Clutching agency

61‧‧‧round

62‧‧‧Active parts

64,68‧‧‧ ratchet

66‧‧‧Removable parts

70‧‧‧ Transmission parts

71, 74‧‧‧ shims

72‧‧‧Flexible parts

76, 78‧‧‧fasteners

80‧‧‧Post

82‧‧‧Output Department

84‧‧‧ Input Department

86‧‧‧ screwdriver head

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a preferred embodiment of a torque driver of the present invention.

Figure 2 is a side view of the torque driver.

Fig. 3 is a plan view taken along line A-A of Fig. 2;

Fig. 4 is a plan view taken along line B-B of Fig. 3.

Fig. 5 is a schematic cross-sectional view taken along line C-C of Fig. 3 after the combination of the main and secondary buttons.

Figure 6 is a schematic diagram of the action of the torque driver.

Figure 7 is a cross-sectional view of a portion of the clutch mechanism.

Figure 8 is a cross-sectional view of another embodiment of the clutch mechanism.

Figures 9 and 10 are three-dimensional and top views of the use state of the torque driver.

Figure 11 is a schematic illustration of another embodiment of a cam.

Referring to Figures 1 and 2, a specific structure of the torque driver 10 is illustrated. A body 12 is coupled to a post 80 for outputting a torque to a workpiece such as a screw or nut (not shown). (or torque).

In this embodiment, the body 12 has a transverse section and a longitudinal section, and the transverse section and the longitudinal section are integrally formed, so that the functional shape of the body 12 is substantially T-shaped. The horizontal section is convenient for use The person holds the body 12 and operates the longitudinal segments to rotate in the same direction.

In some embodiments, the body 12 has no lateral segments. Therefore, the body 12 is maintained in an upright position for holding by the longitudinal section, and is also within the scope of the present invention.

As shown in Figures 9 and 10, the body 12 also has a collection chamber 18 that is recessed into the transverse section of the body 12 to a depth such that some of the driver heads 86 are placed in the collection chamber 18. In the collection chamber 18, there are two sets of recesses 11 formed in a group of three recesses 11 and formed integrally inside the body 12. Each recess 11 is sufficient to accommodate and position the sub-head 86 together to facilitate the torque driver 10 carrying the desired driver head 86.

In the figure, the opening of the collection chamber 18 is covered by a top cover 14. The top cover 14 has a pivoting portion 13 and a buckle portion 15. The pivoting portion 13 is coupled to the body 12 to support the top cover 14 to be lifted relative to the body 12. The buckle portion 15 is similar to the hook body and is not at the same end of the top cover 14 as the pivot portion 13 . The buckle portion 15 is engaged with a latch portion 17 formed on the outer surface of the body 12, so that the opening of the top cover 14 covering the storage chamber 18 is not arbitrarily picked up, and the screwdriver head 86 is prevented from leaving the torque driver 10.

3 to 5, an assembly portion 20 is formed inside the body 12, and a cam 30, a clutch mechanism 60 and an elastic member 72 are disposed in the assembly portion 20. The assembly portion 20 is divided into an operation chamber 22, a restriction hole 24, and a work compartment 26 as viewed in the longitudinal direction of the body 12. The operating room 22 is in the collection chamber 18 at a different end of the assembly 20 from the work compartment 26. The restriction hole 24 communicates the operation chamber 22 and the work chamber 26 with each other.

The cam 30 has a pivot point 32 centered on the pivot point 32 which is rotated at the assembly portion 20. In the present embodiment, the surface 38 of the cam 30 is irregular, and two distances 34, 36 are planned from the surface 38 of the cam 30 to the pivot point 32. Therefore, these distances 34, 36 are not equal.

In some embodiments (such as Figure 11), the surface 38 of the cam 30 has two distances 31, 33 from the pivot point 32. These distances 31, 33, 34, 36 are not equal, so that the torque driver 10 has four types. Different options.

Because the clutch mechanism 60 and the cam 30 are not at the same end of the assembly portion 20, and are elastic The member 72 is between the cam 30 and the clutch mechanism 60, so the cam 30 rotates about the pivot point 32, and these distances 34, 36 interchange the orientation. Any distance 34, 36 maintains the transmission relationship between the cam 30 and the elastic member 72 in the radial direction, and determines that the elastic member 72 applies a force to the clutch mechanism 60. Briefly, when the cam 30 is turned to a short distance 36, the elastic member 72 imparts a weak force to the clutch mechanism 60; if the cam 30 is turned to a long distance 34 (see Fig. 6), the relative elastic member 72 is lifted. The force imparted to the clutch mechanism 60 is given.

In the figure, a shaft portion 42 is coupled to the body 12 and maintains a rotational relationship with the cam 30. The axis of the shaft portion 42 is regarded as a pivot point 32, and the support cam 30 is rotated about the pivot point 32 in the operation chamber 22. The cross-section of the shaft portion 42 is similar to the functional shape of the cross. When the shaft portion 42 passes the cam 42, the shaft portion 42 is concavely and convexly fitted to the cam 42. Besides the support cam 30 is suspended in the operation chamber 22, the cam 30 can be rotated relative to the body 12 without being affected by the wall surface of the operation chamber 22. In addition, the shaft portion 42 has two polygonal columns 44, 46 at the different ends of the shaft portion 42. Each of the polygonal columns 44, 46 can be square, hexagonal or semi-circular.

A main button 40 and a pair of button 50 are on both sides of the body 12, and the main button 40 and the sub button 50 are coupled through the shaft portion 42, and the three maintain a synchronous actuating relationship. Specifically, the main button 40 has an enlarged diameter hole 47 and a polygonal hole 48. The enlarged diameter hole 47 communicates with the polygonal hole 48. The polygonal hole 48 fits the polygonal column 44 to make the main button 40 and the shaft portion 42. Can be synchronized. The secondary button 50 has a shape that is substantially symmetrical to the shape of the main button 40, and also has an enlarged diameter hole 52 and a polygonal hole 54. The enlarged diameter hole 52 communicates with the polygonal hole 54, and the polygonal hole 54 is engaged with the polygonal column 46 so that the secondary button 50 and the shaft portion 42 can also be operated in synchronization.

The expansion hole 47 is inserted into the enlarged diameter hole 47 by a fastener 76 which is like a bolt, thereby being locked into the polygonal column 44, so that the main button 40 is not easily detached from the shaft portion 42. Another fastener 78 is placed into the enlarged diameter bore 52 and likewise locked into the corresponding polygonal post 46 to engage the secondary button 50 and the shaft portion 42.

In the present embodiment, the main button 40 faces the body 12 to form two recesses 41 which are around the shaft portion 42. The two movable columns 43 and the two compression springs 45 are disposed at the main body 12 facing the main button 40. One end of each compression spring 45 abuts the body 12, and the other end pushes the movable column 43 against the recess 41. The main button 40 achieves the effect of positioning.

Similarly, the secondary button 50 also has two recesses 51 facing the body 12, and these pockets 51 are around the shaft portion 42. The movable column 53 and the two compression springs 55 are disposed on the body 12 facing the secondary button 50. Each of the compression springs 55 is mounted on the body 12, and can push the movable column 53 against the corresponding cavity 51 to position the secondary button 50. effect.

In some embodiments (such as Figure 11), the number of pockets 41 (or 51) of the main button 40 (or secondary button 50) is increased to four, giving the torque driver four positioning points.

Of course, the number of the movable column and the compression spring is reduced from two to one, and the corresponding recess 41 or 51 can also be caught, without affecting the positioning effect of the main button 40 or the sub button 50 on the body 12.

In the figure, a transmission member 70 can enter and exit the operation chamber 22 and the work chamber 26 through the restriction hole 24. The transmission member 70 contacts the surface 38 of the cam 30, and the force applied by the elastic member 72 to the clutch mechanism 60 is determined in response to the displacement of the distances 34, 36. The transmission member 70 indirectly contacts the elastic member 72 through a spacer 71, effectively pressing the elastic member 72 to reduce the total length.

In the present embodiment, the transmission member 70 and the spacer 71 are separate bodies. In some embodiments, the transmission member 70 is integrally formed with the spacer 71 and is also within the scope of the present invention.

In addition, other spacers 74 are placed between the elastic member 72 and the clutch mechanism 60, so that the elastic member 72 indirectly contacts the clutch mechanism 60. When the cam 30 rotates about the pivot point 32, the spacing between the spacers 71, 74 varies depending on the orientation of the two distances 34, 36, increasing or decreasing the force applied by the resilient member 72 to the clutch mechanism 60.

The elastic member 72 referred to herein refers to a compression spring, a stacked reed or other elastic material.

The clutch mechanism 60 referred to herein refers to an active member 62 and a follower 66 that are engaged with each other. The bottom surface of the active member 62 protrudes from the ratchet teeth 64, and the top surface indirectly contacts the elastic member 72 through the spacer 74. The active member 62 is surrounded by a hexagon (see Figure 7), which generally conforms to the working compartment 26 The hexagonal space is such that the active member 62 moves back and forth along the longitudinal direction of the body 12 but does not rotate relative to the body 12. The follower 66 is raised against the active member 62 with a plurality of ratchet teeth 68 that engage or engage the ratchet teeth 64 of the active member 62.

Under the force of the elastic member 72, the follower 66 is pressed against the bottom cover 16 by the driving member 62, and although it is not easily reciprocally displaced along the longitudinal direction of the body 12, it can be rotated in the working compartment 26 of the body 12. The follower 66 is sleeved around an input portion 84. The input portion 84 and an output portion 82 are at different ends of the post 80 such that the follower 66 and the post 80 can rotate in the same direction.

The output portion 82 referred to herein is a hexagonal groove that is caught in the end surface of the post 80, allowing any sub-head 86 to be inserted into the output portion 82 of the post 80.

As such, when the elastic member 72 applies a weak force to the driving member 62, the torque value transmitted by the driving member 62 to the post 80 through the follower 66 is relatively reduced. Conversely, the elastic member 72 applies a stronger force to the driving member 62 to relatively increase the torque value transmitted by the driving member 62 to the post 80 through the follower member 66. Therefore, the torque driver 10 has a plurality of options available.

In some embodiments, the clutch mechanism 60 has a plurality of circular objects 61, such as Figure 8. Each of the circular objects 61 is an object having a circular cross section, such as a bead or a cylinder. The circular object 61 is disposed at a corner of the active member 62 and maintains a point contact relationship with the wall surface of the working compartment 26, which is sufficient to make the active member 62 move back and forth relative to the body 12 more smoothly.

Claims (10)

A multi-segment torque driver includes: a body having an assembly portion; a cam rotatably disposed at the assembly portion, the cam having a pivot point that forms at least two unequal distances from the cam surface; a clutch a mechanism disposed at the assembly portion, the clutch mechanism and the cam are not at the same end of the assembly portion; an elastic member disposed at the assembly portion, the elastic member being between the cam and the clutch mechanism; and when the cam is rotated about the pivot point, The distance is interchanged, and any distance maintains the transmission relationship between the cam and the elastic member in the radial direction, and determines the force applied by the elastic member to the clutch mechanism. The multi-section torque driver according to claim 1, wherein the assembly portion comprises: an operation chamber located inside the body; and a shaft portion connected to the body to maintain a rotational relationship with the cam, the shaft portion The axis is regarded as the pivot point, and the support cam rotates around the pivot point in the operating room. The multi-segment torque driver according to claim 2, wherein a main button and a pair of buttons are on both sides of the main body, and the main button and the sub button are combined through the shaft portion, and the three maintain a synchronous actuating relationship. The multi-segment torque driver according to claim 3, wherein the shaft portion has two polygonal columns, the polygonal columns are at different ends of the shaft portion; the main button has an enlarged diameter hole and a polygonal hole, The enlarged diameter hole is connected to the polygonal hole, and the polygonal hole is matched with the polygonal column, so that the main button and the shaft portion can be synchronously actuated; the auxiliary button has an enlarged diameter hole and a polygonal hole, and the enlarged diameter hole communicates with the polygonal hole, The polygonal hole fits the polygonal column so that the secondary button and the shaft portion can be synchronized; two fasteners, one of which is inserted into the enlarged diameter hole and connected to the polygonal column, so that the main button and The shaft portions are joined together; another fastener is placed in the enlarged diameter hole and connected to the polygonal column to join the secondary button and the shaft portion. The multi-section torque driver according to claim 3, wherein the main button forms at least one recess facing the body, the body has at least one movable column, and the movable column is pushed by a compression spring mounted on the body. Stay in the pocket to make the main button get the effect of positioning. The multi-section torque driver according to claim 3, wherein the auxiliary button forms at least one recess facing the body, the body has at least one movable column, and the movable column is pushed by a compression spring attached to the body. Stay in the pocket to make the secondary button get the effect of positioning. The multi-section torque driver of claim 2, wherein the assembly portion further has a restriction hole that communicates with the operation chamber inside the body; and a work chamber that is inside the body and the restriction hole In the same manner, the working compartment houses the clutch mechanism and the elastic member; a transmission member passes through the restriction hole and can enter and exit the operation room and the working compartment, and the transmission member contacts the surface of the cam, and determines the elastic member to be applied to the clutch mechanism according to the displacement of the distance. Force. The multi-section torque driver of claim 7, wherein the transmission member indirectly contacts the elastic member through a gasket. The multi-section torque driver according to claim 8, wherein the transmission member and the gasket are integrally designed. The multi-segment torque driver according to claim 8, wherein the elastic member indirectly contacts the clutch mechanism by another spacer; when the cam rotates around the pivot point, the spacers are separated by a distance of two distances The orientation changes and determines the force exerted by the elastic member on the clutch mechanism.