TWI790892B - Adjustable torque wrench - Google Patents

Abstract

An adjustable torque wrench includes a main body and a main body a driving head and a movable jaw. The main body defines a first direction and a second direction. The movable jaw includes a fixed jaw and a sliding surface. The fixed jaw has a first clamping surface. The first clamping surface extends along a third direction. A first angle is defined by the third direction and the first direction. The sliding surface extends along a fourth direction. A second angle is defined by the fourth direction and the second direction. The movable jaw has a second clamping surface.

Description

adjustable torque wrench

The invention relates to an adjustable torque wrench.

Press, in general, during the locking operation, an adjustable torque wrench that can be set to a torque setting value is used to avoid problems such as damage to the locked object or damage to the thread of the locking element due to excessively tight locking of the locking element occurs, the driving head of the known active torque is pivotally connected to the body through a pivot, when the torque on the driving head is greater than the set value of the torque, the driving head will swing relative to the body to remind the user that the driving The head has a movable jaw and a fixed jaw. The movable jaw can slide relative to the fixed jaw for clamping fasteners of different sizes. A rotatable adjustment piece is installed on the end of the body opposite to the drive head. When the adjustment piece is rotated, the torque is adjusted to the shaft. That is, it will be driven by the adjustment piece to move with the body, and then achieve the function of adjusting the torque setting value.

However, since the fasteners have various sizes, when the movable jaw and the fixed jaw clamp different sizes of fasteners, the centers of the different sizes of the fasteners will have different distances from the length of the pivot, which will cause the actual locking force to be different from the pivot length. There is a slight error in the set value of the torque, so that the locking member cannot be locked according to the preset torque, and there are shortcomings that need to be improved urgently.

Therefore, it is necessary to provide a novel and progressive adjustable torque wrench to solve the above problems.

The main purpose of the present invention is to provide an adjustable torque wrench, which can effectively reduce the error between the actual locking force and the torque setting value, so as to improve the accuracy of locking the locking member.

To achieve the above purpose, the present invention provides an adjustable torque wrench, which includes a body, a driving head and a movable jaw. The body defines a first direction and a second direction perpendicular to each other, and the body extends along a first direction. The drive head is inserted into the body and pivoted to the body by a pivot, the extending direction of the pivot is perpendicular to the first direction and the second direction, the first direction passes through the center of the pivot, the The driving head includes a fixed jaw and a sliding surface, the fixed jaw is provided with a first clamping surface, the first clamping surface extends along a third direction, and a first included angle is formed between the third direction and the first direction , the first included angle is between 40 and 60 degrees, the sliding surface extends along a fourth direction, a second included angle is formed between the fourth direction and the second direction, and the second included angle is between 40 and 60 degrees between 60 degrees. The movable jaw is slid on the sliding surface along the fourth direction, and the movable jaw is provided with a second clamping surface.

The following examples illustrate possible implementations of the present invention, but are not intended to limit the scope of protection of the present invention.

Please refer to FIGS. 1 to 4 , which show a preferred embodiment of the present invention. The adjustable torque wrench of the present invention includes a body 1 , a driving head 2 and a movable jaw 3 .

The body 1 defines a first direction L1 and a second direction L2 perpendicular to each other, and the body 1 extends along a first direction L1.

The drive head 2 is inserted into the body 1 and pivoted to the body 1 by a pivot 21. When the torque on the drive head 2 is greater than a torque setting value, the drive head 2 will pass through the pivot 21 swings relative to the main body 1 to remind the user to reach the torque setting value. The extension direction of the pivot 21 is perpendicular to the first direction L1 and the second direction L2, and the first direction L1 passes through the pivot 21. Center, the drive head 2 includes a fixed jaw 22 and a sliding surface 23, the fixed jaw 22 is provided with a first clamping surface 24, the first clamping surface 24 extends along a third direction L3, the third direction L3 and A first included angle θ1 is formed between the first directions L1, and the first included angle θ1 is between 40 and 60 degrees. The sliding surface 23 extends along a fourth direction L4, and the fourth direction L4 and the second A second included angle θ2 is formed between the directions L2, and the second included angle θ2 is between 40° and 60°.

The movable jaw 3 is slidably disposed on the sliding surface 23 along the fourth direction L4 , and the movable jaw 3 is provided with a second clamping surface 31 .

Preferably, the first included angle θ1 and the second included angle θ2 are 45 degrees to 50 degrees, and in this embodiment, the first included angle θ1 and the second included angle θ2 are 50 degrees. In actual use, as shown in Figure 2, the first clamping surface 24 and the second clamping surface 31 are used to clamp a locking piece 9, the locking piece 9 is a metric M4 hexagonal bolt, and the end angle of the locking piece 9 touches the top On the sliding surface 23, the center of the locking member 9 is projected along the second direction L2 onto the first direction L1 to define a first reference point 91, the distance between the center of the pivot 21 and the first reference point 91 Define a first distance D1, the first distance D1 is the force arm of the drive head 2, the first distance D1 is 78.4 cm; and as shown in Figure 3, when the locking member 9A is a metric M8 hexagon bolt , the first distance D1 is 78.4 cm; and as shown in Figure 4, when the locking member 9B is a metric M12 hexagonal bolt, the first distance D1 is 78.3 cm, so the gap between the first distance D1 can be about 0.127%, so It can effectively reduce the torque error during locking, so as to have a more accurate locking effect.

Specifically, the first clamping surface 24 is parallel to the second clamping surface 31 , and the third direction L3 is perpendicular to the fourth direction L4 .

Preferably, the fixed jaw 22 includes an oblique convex portion 25 protruding from the end of the first clamping surface 24 connected to the sliding surface 23 to increase the structural strength of the fixed jaw 22 . The angle between the oblique convex part 25 and the first clamping surface 24 is between 115 and 135 degrees, and in this embodiment, the angle between the oblique convex part 25 and the first clamping surface 24 is 125 degrees, which can have the best Be supportive.

In addition, preferably, the movable jaw 3 includes an inclined concave portion 32, which is recessed at the end of the second clamping surface 31 adjacent to the sliding surface 23, so that the movable jaw 3 can move toward the fixed jaw 22. When sliding, the end of the second clamping surface 31 adjacent to the sliding surface 23 is less likely to abut against the sliding surface 23 , resulting in failure to slide smoothly. The included angle between the oblique concave portion 32 and the fourth direction L4 is between 55° and 35°, and in this embodiment, the angle between the obliquely inverted concave portion 32 and the fourth direction L4 is 45°, which can take into account the orientation of the movable jaw 3 at the same time. Structural strength and prevent one end of the second clamping surface 31 from abutting against the sliding surface 23 .

Compared with the above-mentioned embodiment, please refer to FIGS. 5 to 7. In another preferred embodiment of the present invention, the fixed jaw 22A of the driving head 2A is provided with a first clamping surface 24A, and the movable jaw 3A is along the fourth direction L4 Sliding on the sliding surface 23A, a first angle θ1A is formed between the third direction L3 and the first direction L1, a second angle θ2A is formed between the fourth direction L4 and the second direction L2, and the first angle θ1A and the second included angle θ2A are 45 degrees; as shown in Figure 6, when the clamped locking member 9 is a metric M4 hexagonal bolt, the first distance D1A is 80.5 cm; as shown in Figure 7, when the clamped lock When the firmware 9B is a metric M12 hexagonal bolt, the first distance D1A is 81.1 cm, so the difference between the first distance D1A can be about 0.745%, so it also has a more accurate locking effect.

To sum up, the adjustable torque wrench of the present invention can effectively reduce the error between the actual locking force and the set value of the torque, so as to improve the accuracy of locking the locking member.

1: Ontology 2,2A: drive head 21: Pivot 22,22A: fixed jaw 23,23A: sliding surface 24,24A: the first clamping surface 25: oblique convex part 3,3A: movable jaw 31: The second clamping surface 32: oblique recess 9,9A,9B:Locking parts 91:First datum point L1: the first direction L2: the second direction L3: the third direction L4: the fourth direction θ1, θ1A: the first included angle θ2, θ2A: the second included angle D1, D1A: first distance

Fig. 1 is a side view of a preferred embodiment of the present invention. 2 to 4 are schematic diagrams of the operation of a preferred embodiment of the present invention. Fig. 5 is a side view of another preferred embodiment of the present invention. 6 to 7 are schematic diagrams of the operation of another preferred embodiment of the present invention.

1: Ontology

2: drive head

21: Pivot

22: fixed jaw

25: oblique convex part

3: movable jaw

32: oblique recess

Claims (10)

An adjustable torque wrench, comprising: a body defining a first direction and a second direction perpendicular to each other, the body extending along a first direction; a driving head, inserted in the body and pivoted to the body by a pivot, the extending direction of the pivot is perpendicular to the first direction and the second direction, the first direction passes through the center of the pivot, The drive head includes a fixed jaw and a sliding surface, the fixed jaw is provided with a first clamping surface, the first clamping surface extends along a third direction, and a first clamping surface is formed between the third direction and the first direction. An included angle, the first included angle is between 40 and 60 degrees, the sliding surface extends along a fourth direction, a second included angle is formed between the fourth direction and the second direction, and the second included angle is between 40 degrees to 60 degrees; A movable jaw is slid on the sliding surface along the fourth direction, and the movable jaw is provided with a second clamping surface. The adjustable torque wrench according to claim 1, wherein the first clamping surface is parallel to the second clamping surface, and the third direction is perpendicular to the fourth direction. The adjustable torque wrench as claimed in item 1, wherein the fixed jaw includes an obliquely inverting portion protruding from the end of the first clamping surface connected to the sliding surface. The adjustable torque wrench according to claim 3, wherein the movable jaw includes an inclined concave portion, and the inclined concave portion is recessed at an end of the second clamping surface adjacent to the sliding surface. The adjustable torque wrench according to claim 3, wherein the angle between the inclined convex portion and the first clamping surface is between 115° and 135°. The adjustable torque wrench according to claim 4, wherein the angle between the inclined concave portion and the fourth direction is between 55° and 35°. The adjustable torque wrench according to claim 6, wherein the angle between the inclined convex portion and the first clamping surface is 125 degrees, and the angle between the inclined concave portion and the fourth direction is 45 degrees. The adjustable torque wrench as described in claim 1, wherein the first clamping surface and the second clamping surface are used to clamp a locking piece, the end corner of the locking piece is against the sliding surface, and the center of the locking piece is along the The projection in the second direction defines a first reference point in the first direction, and the distance between the pivot center and the first reference point defines a first distance. The adjustable torque wrench according to claim 1, wherein the first included angle and the second included angle are 45° to 50°. The movable torque wrench according to claim 7, wherein the first clamping surface is parallel to the second clamping surface, and the third direction is perpendicular to the fourth direction; the first clamping surface and the second clamping surface are used for clamping Holding a locking piece, the end corner of the locking piece is against the sliding surface, the center of the locking piece is projected along the second direction on the first direction to define a first reference point, the center of the pivot axis is in line with the The distance between the first reference point defines a first distance; the first included angle and the second included angle are 50 degrees.

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