TWI743978B - Torque wrench torque adjusting device (1) - Google Patents

Abstract

The present invention discloses a torque adjusting device for a torque wrench, which includes a wrench, a pre-force mechanism installed at one end of the wrench, and a torque adjusting device connecting the wrench and the pre-force mechanism. The wrench has a handle and an operating head. The pre-force mechanism is housed in the handle and provides a pre-pressure to the operating head. The torque adjusting device interacts with the pre-force mechanism to adjust the pre-pressure, and includes: a plurality of first ball holes provided in the handle, a plurality of first balls accommodated in each first ball hole, and a pre-pressure The force mechanism is connected and sleeved on the grip tube on the outer circumference of the handle. The inner diameter surface of the grip tube is provided with a bead groove for sliding of each first ball. With the combination of the above-mentioned components, the grip tube is twisted to adjust the pre-pressure of the pre-force mechanism, and through the interaction of the balls and the bead grooves, the resistance when the grip tube is twisted is reduced.

Description

Torque wrench torque adjusting device (1)

The present invention relates to the technical field related to hand tools, and in particular refers to a torque adjusting device for a torque wrench.

In the previous art, wrenches are 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 limits. In order to facilitate the operation of the wrench, a torque value adjustment mechanism is provided. During the stroke of the fastener, the operating head will be in an idling state when the preset torque value is exceeded.

For the wrench with a torque value adjustment mechanism, please refer to FIGS.

The aforementioned wrench 10 (previous art) includes a hollow handle 12 and an operating head 14 provided at one end of the handle 12. Wherein, an external thread 122 is provided on the outer peripheral surface of one end of the shank 12.

The adjusting mechanism 20 includes a grip 22 and a pre-force assembly 24 connected and interacting with the grip 22 and applying a pre-pressure to the operating head 14. In implementation, both ends of the inner diameter surface of the grip are respectively provided with a first and a second internal thread section 222, 224. The first internal thread section 222 matches the external thread 122 of the shank 12. The second internal threaded section 224 provides the pre-force assembly 24 for screw connection.

By adjusting the different positions of the external thread section 122 of the grip 22 screwed to the handle 12, and the linkage pre-force assembly 24 exerts different pre-pressures on the operating head 14, the torque value of the wrench 10 response can be changed to ensure that the tightening is applied. Firmware (not shown in the picture, For example, the torque of bolts or nuts).

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

1. The handle 12 and the grip 22 are connected through a threaded structure and are relatively displaced. However, there must be a problem of backlash between the screw threads.

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

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

In view of this, how to reduce the burden of twisting the grip 22, its structural design is really necessary for improvement.

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

According to the above objective of the present invention, the present invention provides a torque adjusting device for a torque wrench, which includes a wrench, a pre-force mechanism installed at one end of the wrench, and a torque adjusting device connecting the wrench and the pre-force mechanism. The wrench has a handle and an operating head. The pre-force mechanism is housed in the handle and provides a pre-pressure to the operating head. The torque adjusting device interacts with a pre-force mechanism to adjust the pre-pressure, and includes: a plurality of first ball holes provided in the handle, a plurality of first balls accommodated in each first ball hole, and a pre-force mechanism The grip tube connected and sleeved on the outer circumference of the handle is provided with a bead groove for sliding of each first ball on the inner diameter surface. With the combination of the above-mentioned components, the grip tube is twisted to adjust the pre-pressure of the pre-force mechanism, and through the interaction of the balls and the bead grooves, the resistance when the grip tube is twisted is reduced.

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 section

224: second internal thread segment

24: Pre-force assembly

30: Pre-force mechanism

32: elastic element

34: Follower

40: Torque adjustment device

41, 41’: The first bead hole

42: second bead hole

43: The first ball

44: The second ball

45: grip tube

452, 452’: bead groove

454: pipe thread

456: Second torque value scale

56: C buckle slot

57: C buckle

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

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

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

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

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

[Figure 6] is an exploded schematic view of partial components of another embodiment of the present invention.

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

[Figure 8] is a schematic diagram of a wrench with torque adjustment in the previous technique

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

Hereinafter, please refer to the related drawings to further describe the embodiments of the torque adjusting device of the torque wrench of the present invention. In order to facilitate the understanding of the embodiments of the present invention, the same components are described below with the same symbols.

1 to 5, the torque wrench torque adjusting device of the present invention includes a wrench 10, a pre-force mechanism 30 installed at one end of the wrench, and a torque adjusting device 40 connecting the wrench 10 and the pre-force mechanism 30.

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

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

The aforementioned pre-force mechanism 30 (previous art) provides a pre-pressure to the operating head 14. It includes an elastic element 32 that provides a pressure for the operating head 14 and a follower 34 that compresses the elastic element 32. When implemented, the pre-force mechanism 30 is a prior art The art is not a technical feature of the present invention, so it will not be described further. The embodiments of the present invention are not the only embodiments of the present invention, and all 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.

The first and second bead holes 41 and 42 are arranged at a predetermined position on the outer surface of the other end of the handle 12 away from the operating head 14.

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

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

The aforementioned bead groove 452 and pipe thread 454 are respectively preset positions along the inner diameter surface of the holding tube 45, and the bead groove 452 is a continuous spiral groove and matches the position of each first ball hole 41 to provide each first ball 43 Contains scrolling.

The aforementioned pipe thread 454 is provided for matching connection with the follower 34 of the pre-force 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 12.

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

The C buckle 57 corresponds to the C buckle groove 56 sleeved on the outer surface of the handle 12 and supports the inner diameter surface of the grip tube 45.

Therefore, the foregoing is an introduction to the components and assembly methods of a preferred embodiment of the torque wrench torque adjusting device provided by the present invention. The operating characteristics of the embodiment are introduced as follows.

The user can interact with the pre-force mechanism 30 by twisting the grip tube 45 to adjust the 14 pre-pressure applied by the pre-force mechanism 30 to the working head.

During the rotation of the grip tube 45, each first ball 43 is confined to the handle 12 by the first bead hole 41, so it can only move along the bead groove 452 on the inner diameter surface of the grip tube 45, so that the grip tube 45 rotates along the handle The part 12 is displaced in the extending direction, and the pre-loading mechanism 30 is synchronized to change the 14 pre-pressure applied to the working head.

During the process, the user can further cooperate with watching the first and second torque value scales 122 and 456 to understand the current torque value adjustment status.

Since the grip tube 45 and the handle 12 have a gap, the other end of the grip tube 45 relative to the pipe thread 454 can penetrate the second balls 44 in the second bead holes 42 and the C buckle in the C buckle groove 56 57 provides a push against the outer peripheral side, which increases the stability of the movement of the end grip tube 45.

Please refer to FIGS. 6 and 7 that the positions of the first bead hole 41 and the bead groove 452 in the above embodiment can be symmetrically exchanged. That is, the first bead hole 41' is changed to the inner diameter surface of the grip tube 45, and the bead groove 452' is changed to be provided around the outer circumference of the handle portion 12. As for the operation mode, it is the same as the above-mentioned embodiment, so it will not be described in detail.

The above description is only the preferred embodiments of the present invention. It is intended to clarify the characteristics of the present invention and is not intended to limit the scope of the embodiments of the present invention. Those skilled in the art make equal changes based on 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 tube

456: Second torque value scale

Claims (6)

A torque adjusting device for a torque wrench, which includes: A wrench with a hollow handle and an operating head set at one end of the handle; A pre-force mechanism is housed in the handle and provides a pre-pressure to the operating head; A torque adjusting device interacts with the pre-force mechanism to adjust the pre-pressure, which includes: A plurality of first bead holes are arranged on the outer surface of the handle away from the other end of the operating head; The plurality of first balls are respectively accommodated in each of the first ball holes; and A grip tube is connected with the pre-force mechanism and sleeved on the outer peripheral side of the handle, and its inner diameter surface corresponds to each of the first bead holes to form a continuous spiral bead groove for sliding of each of the first balls. The torque wrench torque adjusting device according to claim 1, wherein the handle 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 provide a plurality of second ball accommodating , And abut the inner diameter surface of the grip tube. The torque wrench torque adjusting device according to claim 1, wherein the handle is provided with a C-buckle groove on the outer peripheral side between the operating head and each of the second bead holes to provide a C-buckle accommodating and top Abut the inner diameter surface of the holding tube. A torque adjusting device for a torque wrench, comprising: a wrench with a hollow handle and an operating head provided at one end of the handle; a pre-force mechanism which is accommodated in the handle and provides an operating head Pre-pressure; a torque adjusting device interacts with the pre-force mechanism to adjust the pre-pressure, including: a grip tube connected with the pre-force mechanism and sleeved on the outer peripheral side of the handle, its inner diameter The surface is provided with a plurality of first bead holes; a plurality of first balls are respectively accommodated in each of the first bead holes; and a bead groove is a continuous spiral groove formed on the shank corresponding to each of the first bead holes, Each of the first balls is provided to slide. The torque wrench torque adjusting device according to claim 1 or 4, wherein the handle is adjacent to the outer peripheral side of the cross section of the grip tube and is provided with a first torque value scale. The torque wrench torque adjusting device 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.

Images