TW202210245A - Torsion adjustment device of torsion wrench (I) reduces the resistance of twisting the grip tube through the interaction between the ball and the ball groove - Google Patents

Abstract

The invention discloses a torsion adjustment device of torsion wrench, comprising a wrench, a pre-force mechanism mounted at one end of the wrench, and a torsion adjustment device connecting the wrench and the pre-force mechanism. The wrench has a handle and an operating head. The pre-force mechanism is accommodated in the handle and provides a pre-pressure to the operating head. The torsion adjusting device interacts with the pre-force mechanism to adjust the pre-pressure, and includes: plural first ball holes arranged in the handle, plural first balls accommodated in each of the first ball holes, and a grip tube connected to the pre-force mechanism and sleeved on the outer peripheral side of the handle. The inner diameter surface of the grip tube has a ball groove provided for sliding each first ball. With the combination of the above components, the grip tube is twisted to adjust the pre-pressure of the pre-force mechanism, and the resistance of twisting the grip tube is reduced through the interaction between the ball and the ball groove.

Description

Torque wrench torque adjustment device (1)

The present invention relates to the technical field related to hand tools, in particular to a torque adjustment device of a torque wrench.

In the prior art, a wrench is often used to drive fasteners (bolts or nuts) for screwing. In the face of precision components, the torque value of the wrench screwing has its limitations. In order to facilitate the operation of the wrench, a torque value adjustment mechanism is provided. During the stroke of the fastener, when the preset torque value is exceeded, the operating head will be in an idling state.

For a wrench with a torque value adjustment mechanism, please refer to FIGS. 8 and 9 . An adjustment mechanism 20 is generally installed at the tail of a wrench 10 .

The aforementioned wrench 10 (prior art) includes a hollow handle portion 12 and an operating head 14 disposed at one end of the handle portion 12 . The outer peripheral surface of one end of the handle portion 12 is provided with an external thread 122 .

The adjusting mechanism 20 includes a handle 22 and a pre-force assembly 24 which is connected and interacted with the handle 22 and applies a pre-pressure to the operating head 14 . During implementation, the two ends of the inner diameter surface of the handle are respectively provided with a first and a second internal thread segments 222 and 224 . The first internal thread segment 222 is matched with the external thread 122 of the shank 12 . The second internal thread section 224 provides the preload assembly 24 to be screwed together.

By adjusting the position where the handle 22 is screwed with the external thread section 122 of the handle 12, the interlocking pre-force assembly 24 applies different pre-pressures to the operating head 14, so that the torque value of the wrench 10 can be changed to ensure the tightening. Firmware (not shown in the figure, For example, the torque of bolts or nuts).

Although the teaching in the previous case can achieve the purpose of adjusting the wrench 10 to respond to different torque values, its structure has the following deficiencies:

1. The handle 12 and the handle 22 are connected through a threaded structure and are displaced relative to each other. However, there must be a problem of tooth backlash between the threads.

2. The threading system is the contact friction of the surface, which makes the process of twisting the grip 40 very laborious.

3. Since the reaction force of the preload assembly 24 will further act on the threaded structure, the process of twisting the handle 22 by the user will be more laborious.

In view of this, how to reduce the burden of the torsion handle 22, its structural design needs to be improved.

In view of the above problems and deficiencies in the prior art, the main purpose of the present invention is to provide a torque adjustment device for a torque wrench, which solves the deficiencies in the above prior art through structural innovation and ingenuity.

According to the above purpose of the present invention, the present invention provides a torque adjustment device for a torque wrench, which includes a wrench, a preload mechanism installed on one end of the wrench, and a torque adjustment device connecting the wrench and the preload mechanism. The wrench has a handle and an operating head. The pre-force mechanism is accommodated in the handle and provides a pre-force to the operating head. The torque adjusting device interacts with a preload mechanism to adjust the preload, and includes: a plurality of first ball holes arranged in the handle, a plurality of first balls accommodated in each of the first ball holes, and a preload mechanism The handle tube is connected and sleeved on the outer peripheral side of the handle, and its inner diameter surface is provided with a ball groove for each first ball to slide. Through the combination of the above components, the grip tube is twisted to adjust the pre-pressure of the pre-stressing mechanism, and the resistance of the grip tube when twisted is reduced through the interaction between the ball and the ball groove.

10: Wrench

12: Handle

122: The first torque value scale

14: Operation head

122: External thread

20: Adjustment mechanism

22: Grip

222: The first internal thread segment

224: Second internal thread segment

24: Preload assembly

30: Pre-force mechanism

32: Elastic element

34: Follower

40: Torque adjustment device

41, 41': the first bead hole

42: The second bead hole

43: The first ball

44: Second Ball

45: Grip the pipe

452, 452': bead groove

454: Pipe thread

456: Second torque value scale

56:C buckle slot

57: C buckle

[FIG. 1] is a three-dimensional schematic diagram of an embodiment of the present invention.

[Fig. 2] is a partial cross-sectional schematic view of the embodiment shown in Fig. 1. [Fig.

[Fig. 3] is an exploded schematic view of the partial components of the embodiment shown in Fig. 1. [Fig.

[Fig. 4] is a schematic cross-sectional view of the embodiment A-A shown in Fig. 2. [Fig.

[Fig. 5] is a schematic cross-sectional view of the embodiment B-B shown in Fig. 2. [Fig.

[FIG. 6] is an exploded schematic diagram of a partial component of another embodiment of the present invention.

[FIG. 7] is a schematic cross-sectional view of another embodiment of the present invention.

[Fig. 8] is a schematic diagram of a wrench with torque adjustment in the prior art

[Fig. 9] is a partial cross-sectional schematic view of the embodiment shown in Fig. 8. [Fig.

Hereinafter, please refer to the related drawings to further describe the embodiments of the torque adjustment device of the torque wrench of the present invention.

Please refer to FIGS. 1 to 5 , the torque adjusting device of the torque wrench of the present invention includes a wrench 10 , a pre-tensioning mechanism 30 mounted on one end of the wrench, and a torque adjusting device 40 connecting the wrench 10 and the pre-tensioning mechanism 30 .

The aforementioned wrench 10 (prior art) includes a hollow handle portion 12 and an operating head 14 disposed at one end of the handle portion 12 .

The aforementioned handle portion 12 is provided with a first torque value scale 122 on the outer peripheral side of the other end away from the operating head 14 .

The above-mentioned pre-force mechanism 30 (prior art) provides a pre-force to the operating head 14 . It includes an elastic element 32 for providing a pressure on the operating head 14 and a follower 34 for compressing the elastic element 32 . When implemented, the pre-force mechanism 30 is the prior art The art is not a technical feature of the present invention, so it will not be further described in detail. The embodiments of the present invention are not the only embodiments of the present invention, and any equivalent embodiments are applicable.

The torque adjusting device 40 includes a plurality of first ball holes 41 , a plurality of second ball holes 42 , a plurality of first balls 43 , a plurality of second balls 44 , a grip tube 45 , a C-buckle groove and a C-buckle.

Each of the first and second bead holes 41 and 42 is set at a predetermined position on the outer side surface of the other end of the handle portion 12 away from the operating head 14 .

The first and second balls 43 and 44 are respectively accommodated in the first and second ball holes 41 and 42 .

The grip tube 45 is matched with the first and second bead holes 41 and 42 and is fitted on the outer peripheral side of the handle portion 12 . It has a bead groove 452 , a pipe thread 454 and a second torque value scale 456 .

The aforementioned bead groove 452 and the pipe thread 454 are respectively preset positions along the inner diameter surface of the grip tube 45 , and the bead groove 452 is a continuous helical groove that matches the position of each of the first ball holes 41 to provide each of the first balls 41 Accommodates scrolling.

The aforementioned pipe threads 454 are provided for mating connection with the follower 34 of the pre-tensioning mechanism 30 .

The aforementioned second torque value scale 456 is formed on the outer peripheral side of the grip tube 45 , adjacent to the first torque value scale 122 of the handle portion 12 .

The C-buckle groove 56 is recessed and formed on the outer side surface of the handle portion 12 and matches the position of the grip tube 45 .

The C-buckle 57 is sleeved on the outer side of the handle portion 12 corresponding to the C-buckle groove 56 , and supports the inner diameter of the handle tube 45 .

Therefore, the above is the introduction of the various components and assembling methods of the torque adjustment device of a torque wrench according to a preferred embodiment of the present invention. The operating characteristics of the embodiment are described as follows.

The user can adjust the preload force 14 exerted by the preload mechanism 30 on the working head by twisting the grip tube 42 and interacting with the preload mechanism 30 .

During the rotation of the handle tube 42, each of the first balls 43 is limited to the handle portion 12 by the first ball holes 41, so it can only move along the bead groove 452 on the inner diameter surface of the handle tube 42, so that the handle tube 42 rotates along the handle. The extension direction of the part 12 is displaced, and the synchronous traction pre-force mechanism 30 changes the pre-pressure applied to the working head 14 .

During the process, the user can further cooperate to watch the first and second torque value scales 122 and 456 to know the current torque value adjustment state.

Since there is a gap between the grip tube 42 and the handle portion 12 , the other end of the grip tube 42 relative to the pipe thread 454 can pass through the second balls 44 in the second ball holes 42 and the C buckle in the C buckle groove 56 . The outer peripheral side of 57 provides abutment to increase the stability of the movement of the end grip tube 42 .

Referring to FIGS. 6 and 7 , the positions of the first bead hole 41 and the bead groove 452 in the above embodiment can be exchanged symmetrically. That is, the first bead hole 41' is reconfigured on the inner diameter surface of the grip tube 42, and the bead groove 452' is reconfigured around the outer peripheral side of the handle portion 12. The operation mode is the same as that of the above-mentioned embodiment, so it will not be repeated here.

The above descriptions are only preferred embodiments of the present invention, and are intended to clarify the characteristics of the present invention, but not to limit the scope of the embodiments of the present invention. Those skilled in the art can make equal changes according to the present invention. , and changes well known to those skilled in the art should still fall within the scope of the present invention.

10: Wrench

12: Handle

122: The first torque value scale

14: Operation head

30: Pre-force mechanism

40: Torque adjustment device

45: Grip the pipe

456: Second torque value scale

Claims (6)

A torque adjustment device for a torque wrench, comprising: a wrench with a hollow handle and an operating head arranged at one end of the handle; a pre-force mechanism, which is accommodated in the handle and provides a pre-pressure to the operating head; A torque adjustment device interacting with the preload mechanism to adjust the preload, including: A plurality of first bead holes are arranged on the outer side surface of the other end of the handle away from the operating head; A plurality of first balls are respectively accommodated in each of the first ball holes; and A grip tube is connected to the pre-tensioning mechanism and sleeved on the outer peripheral side of the handle, and a continuous spiral bead groove is formed on the inner diameter surface corresponding to each of the first bead holes to provide each of the first balls to slide. The torque adjustment device for a torque wrench as claimed in claim 1, wherein the handle portion is provided with a plurality of second ball holes on the outer peripheral side between the operating head and each of the first ball holes to accommodate a plurality of second balls , and abut against the inner diameter surface of the grip tube. The torque adjustment device for a torque wrench as claimed in claim 1, wherein the handle portion is provided with a C-buckle groove on the outer peripheral side between the operating head and each of the second bead holes, providing a C-buckle accommodation, and the top Abut the inner diameter surface of the grip tube. A torque adjustment device for a torque wrench, comprising: a wrench with a hollow handle and an operating head arranged at one end of the handle; a pre-force mechanism, which is accommodated in the handle and provides a pre-pressure to the operating head; A torque adjustment device interacting with the preload mechanism to adjust the preload, including: a grip tube, which is connected with the preloading mechanism and is sleeved on the outer peripheral side of the handle, and its inner diameter surface is provided with a plurality of first bead holes; A plurality of first balls are respectively accommodated in each of the first ball holes; and A ball groove corresponds to the continuous spiral groove formed by each of the first ball holes, and provides each of the first balls to slide. The torque adjustment device for a torque wrench as claimed in claim 1 or 4, wherein the handle portion is adjacent to the outer peripheral side of the section of the grip tube, and is provided with a first torque value scale. The torque adjustment device for a torque wrench according to claim 5, wherein a second torque value scale is provided on the outer peripheral side of the grip tube adjacent to the first torque value scale.

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