TWI888296B - Torque wrench locking ring positioning structure - Google Patents

Abstract

A torque wrench locking ring positioning structure includes a hollow rod and a torque adjustment handle that are sleeved together along the axis, and a locking ring that is sleeved on the outside of the torque adjustment handle and can be switched between a locking position and an unlocking position. The locking ring is provided with a first positioning groove and a second positioning groove inside the locking ring, and the torque adjustment handle is provided with a positioning assembly, which includes a cylinder, a compression spring and a positioning bead; when the locking ring is in the unlocking position, the positioning bead is limited to the first positioning groove; when the locking ring is in the locking position, the positioning bead is limited to the second positioning groove; according to the above structure, the locking ring can effectively lock the torque adjustment handle, thereby improving the use safety and torque accuracy of the torque wrench.

Description

Torque wrench locking ring positioning structure

The present invention relates to a torque wrench, and more specifically, to a locking structure for torque adjustment.

A torque wrench is a precision hand tool used to control the torque applied to bolts or nuts (referred to as target locking parts) to ensure the strength and reliability of the object's joint. The torque wrench is equipped with mechanical components such as compression springs, adjustment bolts, and actuators. When the torque applied to the target locking parts reaches the preset value, these components will produce relative displacement, thereby triggering a release mechanism, so that the torque of the wrench is no longer applied to the target locking parts, and the wrench will send out a perceptible signal, such as a "click" sound, to let the operator know that the preset torque has been reached.

The torque value of the torque wrench can be adjusted according to the tightening force required by the target locking part. In short, the adjustment method is to rotate a torque adjustment handle of the torque wrench to actuate the adjustment bolt inside it to move, change the pressure applied to the compression spring, and thus change the tightness of the toggle part and the hollow rod of the torque wrench. During the adjustment process, the user can visually know the torque strength through the scale on the outside of the torque wrench. After the torque value is determined, the torque adjustment handle can be locked by axially moving a locking ring on the torque adjustment handle from an unlocked position to a locked position so that the torque adjustment handle cannot rotate, and the torque value is fixed to prevent the torque adjustment handle from being accidentally rotated during the operation of the torque wrench to change the torque value. Conversely, by moving the locking ring from the locked position to the unlocked position, the torque adjustment handle can be rotated, thereby adjusting or returning the torque value of the torque wrench to zero.

From the above introduction, it can be seen that the locking ring and its locking and releasing of the torque adjustment handle play a key role in locking the torque value of the torque wrench. Therefore, the positional certainty of the locking ring on the torque wrench is crucial.

Problems to be solved by this invention:

From the content disclosed in the prior art, it can be known that the locking ring and its locking and releasing of the torque adjustment handle, as well as the locking torque value of the torque wrench, play a key role. Accordingly, the position determination of the locking ring on the torque wrench is crucial. The purpose of the present invention is to provide a positioning structure for determining the locking ring in the unlocking position and the locking position.

Technical features of the invention:

A torque wrench locking ring positioning structure includes a hollow rod and a torque adjustment handle that are sleeved together along the axis, and a locking ring that is sleeved on the outside of the torque adjustment handle and can be switched between a locking position and an unlocking position. The locking ring is provided with a first positioning groove and a second positioning groove on the inner ring, and the torque adjustment handle is provided with a positioning assembly, which includes a cylinder, a compression spring and a positioning bead; when the locking ring is in the unlocking position, the positioning bead is limited to the first positioning groove; when the locking ring is in the locking position, the positioning bead is limited to the second positioning groove.

In a preferred embodiment of the present invention, a locking structure is further included, including a plurality of clamping grooves, a first ball, a second ball, a retreat groove, and a push portion; the plurality of clamping grooves are arranged on the outer wall of the hollow rod; the first ball is arranged in a first bead hole on the side wall of the torque adjustment handle; the second ball is arranged in a second bead hole on the side wall of the torque adjustment handle; the retreat groove is annularly recessed on the inner wall of the locking ring. , when the locking ring is in the unlocking position, the retreat groove receives the first ball and the second ball separated from the outer wall of the clamping section and the clamping groove; the pushing part is annularly convexly arranged on the inner wall of the locking ring and connected to the retreat groove with an inclined surface; when the locking ring is in the locking position, the inclined surface pushes against the first ball to make it contact and resist the outer wall of the hollow rod body, and the pushing part pushes against the second ball to make it clamped in the clamping groove.

The efficacy of this invention:

The positioning assembly uses the elastic force of the compression spring to push the positioning bead to the first positioning groove or the second positioning groove, ensuring that the locking ring is stably positioned at the locking position and the unlocking position. Unless a predetermined external force is applied to axially move the locking ring, the positioning ability of the locking ring is sufficient to resist the force of normal operation of the torque wrench, and the locking ring will not move easily or loosen.

The locking ring forms a locking relationship between the torque adjustment handle and the hollow rod through the first ball and the second ball, and the locking relationship occurs at two locations, one is the outer wall of the clamping section, and the other is the clamping groove, so that the locking firmness is enhanced.

10: Hollow rod

11: Card section

111:Outer wall

20: Torque adjustment handle

21: Positioning segment

22: First bead hole

23: Second bead hole

24: Accommodation hole

30: Locking ring

40: Wrench head

50: Locking structure

51: Card slot

53: The first ball

54: Second ball

55: concession slot

56: Pushing and manufacturing department

57: Incline

60: Positioning structure

61: Positioning assembly

611: Cylinder

612: Limit opening

613: Compression spring

614: Positioning beads

62: First positioning groove

63: Second positioning groove

P1: Unlock position

P2: Lock position

[Figure 1] A combined plan view of a preferred embodiment of the torque wrench structure of the present invention.

[Figure 2] A three-dimensional exploded view of the locking ring and its related components of the present invention.

[Figure 3] Plan view of the positioning assembly of the present invention.

[Figure 4] A cross-sectional view of the positioning assembly of the present invention.

[Figure 5] A cross-sectional view of the components of Figure 2 of the present invention, showing the locking ring in the locked position.

[Figure 6] A cross-sectional view of the components of Figure 2 of the present invention, showing the locking ring in the unlocked position.

In order to facilitate the explanation of the central idea of the present invention in the above invention content column, it is expressed by a specific embodiment. The various objects in the embodiments are depicted according to the proportions, sizes, deformations or displacements suitable for the description, rather than being drawn according to the proportions of the actual components. In the following description, the same and symmetrically configured components are represented by the same number. The terms "first" and "second" are only used to describe the components and cannot be understood as indicating or implying relative importance or order.

As shown in FIG1 , the torque wrench of the present invention comprises a hollow rod 10, a torque adjustment handle 20, and a locking ring 30. One end of the hollow rod 10 is connected to a wrench head 40. A clamping section 11 of the hollow rod 10 is coaxially sleeved inside a positioning section 21 of the torque adjustment handle 20. The torque adjustment handle 20 can rotate forward and reverse around the clamping section 11. The torque value of the torque wrench can be adjusted by rotating the torque adjustment handle 20. The locking ring 30 is sleeved outside the positioning section 21 and can be switched between an unlocking position P1 and a locking position P2 along the axis.

The torque wrench is internally provided with mechanical components such as compression springs, adjustment bolts, and toggle parts. When the torque applied to the target locking part reaches the preset value, these components will trigger a release mechanism so that the torque of the wrench is no longer applied to the target locking part. These mechanical components are known technologies and are not the main technical features of the present invention, so the relevant descriptions and drawings are omitted in the manual and drawings.

As shown in Figure 2, the torque wrench also includes a locking structure 50 and a positioning structure 60.

As shown in Figures 2, 5 and 6, the locking structure 50 includes a plurality of locking grooves 51, a first ball 53, a second ball 54, a retreat groove 55, and a push portion 56.

Several of the clamping grooves 51 are arranged on the outer wall 111 of the clamping section 11 in parallel with the axial direction of the hollow rod 10.

The first ball 53 is disposed in a first ball hole 22 on the side wall of the positioning section 21. The first ball 53 can reciprocate along the first ball hole 22 toward or away from the clamping section 11, thereby partially contacting the outer wall 111 of the clamping section 11, or retreating therefrom.

The second ball 54 is disposed in a second ball hole 23 on the side wall of the positioning section 21. The second ball 54 can reciprocate along the second ball hole 23 toward or away from the clamping section 11, so that part of the ball body is clamped in the clamping groove 51, or withdraws from there.

The retreat groove 55 is annularly recessed on the inner wall of the locking ring 30. When the first ball 53 retreats from the outer wall 111 of the clamping section 11, part of the ball is received by the retreat groove 55. When the second ball 54 retreats from the clamping groove 51, part of the ball is received by the retreat groove 55.

The pusher 56 is annularly protruding from the inner wall of the locking ring 30, and the pusher 56 is connected to the retreat groove 55 with an inclined surface 57. The inclined surface 57 pushes against the first ball 53, so that part of the ball contacts and resists the outer wall 111 of the clamping section 11. The pusher 56 pushes against the second ball 54, so that part of the ball is clamped in the clamping groove 51.

As shown in Figures 2 to 6, the positioning structure 60 includes a positioning assembly 61, a first positioning groove 62 and a second positioning groove 63.

The positioning assembly 61 includes a cylinder 611, a compression spring 613 and a positioning bead 614 disposed in the cylinder 611. The compression spring 613 pushes the positioning bead 614, and a limiting opening 612 of the cylinder 611 allows the positioning bead 614 to partially protrude from the cylinder 611. The positioning assembly 61 is fixed to a receiving hole 24 on the side wall of the positioning section 21 by the cylinder 611.

The first positioning groove 62 and the second positioning groove 63 are annularly recessed on the inner wall of the locking ring 30, and their cross-sections are semi-spherical, for receiving the part of the positioning bead 614 protruding from the cylinder 611.

The above is about the structural layout of the present invention. The following is an explanation of the operation of the present invention.

As described in the prior art, the torque value of the torque wrench can be adjusted according to the tightening force required for the target fastener (bolt or nut). In short, the adjustment is completed by rotating the torque adjustment handle 20 forward or reversely.

As shown in Figure 6, the torque adjustment handle 20 is in a rotatable state. The locking ring 30 should be switched to the unlocking position P1 to release the locking relationship between the torque adjustment handle 20 and the hollow rod 10.

When the locking ring 30 is located at the unlocking position P1, part of the positioning bead 614 is limited to the first positioning groove 62. The retreat groove 55 accommodates part of the first ball 53 and the second ball 54, the first ball 53 retreats from the outer wall 111 of the clamping section 11, and the second ball 54 retreats from the clamping groove 51. The torque adjustment handle 20 has no limit relationship with the hollow rod 10, so the torque adjustment handle 20 can rotate around the hollow rod 10 to adjust the torque value of the torque wrench.

As shown in FIG5 , when the torque wrench has adjusted its torque value to the expected value, the locking ring 30 should be switched from the unlocking position P1 to the locking position P2 to restore the locking relationship between the torque adjustment handle 20 and the hollow rod 10.

When the locking ring 30 is located at the locking position P2, part of the positioning bead 614 is limited to the second positioning groove 63. The inclined surface 57 pushes against the first ball 53, so that part of the bead contacts and resists the outer wall 111 of the clamping section 11. The pushing portion 56 pushes against the second ball 54, so that part of the bead is clamped in the clamping groove 51. Accordingly, the locking ring 30 forms a locking relationship between the torque adjustment handle 20 and the hollow rod 10 through the first ball 53 and the second ball 54, and the locking relationship occurs at two positions, one is the outer wall 111 of the clamping section 11, and the other is the clamping groove 51, so that the locking firmness is enhanced. .

In addition, the positioning assembly 61 uses the elastic force of the compression spring 613 to push the positioning bead 614 to the first positioning groove 62 and the second positioning groove 63, ensuring that the locking ring 30 is stably positioned at the locking position P2 and the unlocking position P1. Unless a predetermined external force is applied to axially move the locking ring 30, the positioning ability of the locking ring 30 is sufficient to resist the force of normal operation of the torque wrench, and the locking ring 30 will not move easily and there is no risk of loosening.

11: Card section

111:Outer wall

21: Positioning segment

30: Locking ring

51: Card slot

53: The first ball

54: Second ball

55: concession slot

56: Pushing and manufacturing department

57: Incline

61: Positioning assembly

62: First positioning groove

63: Second positioning groove

P2: Lock position

Claims (2)

A torque wrench locking ring positioning structure, the torque wrench includes a hollow rod, a torque adjustment handle, and a locking ring; the hollow rod is coaxially sleeved inside a positioning section of the torque adjustment handle with a clamping section, and the torque adjustment handle can rotate around the clamping section; the locking ring is sleeved outside the positioning section and can switch between an unlocking position and a locking position along the axis; The torque wrench also includes a positioning structure and a locking structure; Its characteristics are: The positioning structure includes a positioning assembly, a first positioning groove and a second positioning groove; The positioning assembly includes a cylinder, a compression spring and a positioning bead arranged in the cylinder; the compression spring pushes the positioning bead, and a limiting opening of the cylinder allows the positioning bead to protrude partly from the cylinder; The positioning assembly is fixed in a receiving hole on the side wall of the positioning section by the cylinder; The first positioning groove and the second positioning groove are annularly recessed on the inner wall of the locking ring, and their cross-section is semi-spherical; When the locking ring is in the unlocking position, part of the positioning bead is limited in the first positioning groove; When the locking ring is in the locking position, part of the positioning bead is limited in the second positioning groove. The torque wrench locking ring positioning structure as described in claim 1, wherein the locking structure includes a plurality of clamping grooves, a first ball, a second ball, a retreat groove, and a push- portion; Several clamping grooves are arranged on the outer wall of the clamping section in parallel to the axial direction of the hollow rod; The first ball is disposed in a first ball hole on the side wall of the positioning section, and the first ball can reciprocate along the first ball hole toward or away from the outer wall of the clamping section; The second ball is disposed in a second ball hole on the side wall of the positioning section, and the second ball can reciprocate along the second ball hole toward or away from the clamping groove; The retreat groove is annularly recessed on the inner wall of the locking ring. When the locking ring is in the unlocking position, the retreat groove receives the first ball and the second ball separated from the outer wall of the clamping section and the clamping groove; The push part is annularly convexly disposed on the inner side wall of the locking ring, and the push part is connected to the retreat groove with an inclined surface; when the locking ring is in the locking position, the inclined surface pushes against the first ball to make it contact and resist the outer wall of the clamping section; the push part pushes against the second ball to make it clamped in the clamping groove.