JP2001071278A - Torque wrench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the change of the fastening torque adjusted during the working, by mounting an adjustment operation part of a torque adjusting mechanism to one end of a handle at a side far from a mounting part, and demountably mounting a cover for covering the adjustment operating part. SOLUTION: A mounting part 2 having a mounting hole 2a to be engaged with a fastening member is rotatably mounted on a head part 3 in a torque wrench 1, a handle 4 extending toward the outer peripheral direction of the mounting hole 2a is connected to the head part 3, and a torque idling mechanism engaged for idling when the torque over a set fastening torque is added, is mounted on the mounting part 2. Further a torque adjusting mechanism for changing the fastening torque is mounted at the handle 4 side, the fastening member is engaged with the mounting hole 2a, and the handle 4 is rotated to execute the fastening with the torque not over the set fastening torque. The torque wrench 1 is provided with an adjustment operation part of the torque adjustment mechanism on one end of the handle 4 at a side far from the mounting part 2, and a cover 8 for covering the adjustment operating part is demountably mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a bolt, a nut,
The present invention relates to a torque wrench that can be attached with a predetermined tightening torque when attaching a screw such as various screws.

[0002]

2. Description of the Related Art In a conventional torque wrench provided with a torque adjusting mechanism capable of adjusting a tightening torque, an adjustment operation section which is manually operated to adjust the tightening torque is exposed to the outside. . However, usually, the tightening torque adjusted once is often used to perform the tightening many times. At this time, the adjustment operation unit was sometimes moved by touching it with a hand. Therefore, the tightening torque sometimes changed during use. Therefore, the tightening torque determined from safety, durability, strength, and the like may be deviated, and the work may be redone. In addition, when mounting is performed by fastening a plurality of places, there may be a problem that a plurality of places are fastened with different tightening torques than a deviation of a slight value of the tightening torque.

[0003]

The problem to be solved by the present invention is to solve the conventional problems and to provide a torque wrench capable of keeping the tightening torque adjusted during the work.

[0004]

Means for Solving the Problems The constitution of the present invention which solves the above problems is as follows: 1) A mounting portion having a mounting hole for engaging a fastening member is rotatably provided on a head portion, and the mounting portion is mounted on the head portion. A torque adjusting mechanism for connecting a handle extending toward an outer peripheral direction of the hole, providing a torque idling mechanism that engages so as to idle when a torque exceeding a set tightening torque is applied to the mounting portion, and changes the tightening torque; Is provided on the handle side, a tightening member is engaged with the mounting hole, and the handle is rotated to tighten the tightening torque so as not to exceed a set tightening torque. A torque wrench, which is provided at one end of the handle on a remote side, and a cover for covering the adjustment operation unit is detachably provided. 2) The value of torque adjusted by the adjustment operation unit Wherein the torque display section is provided so that the torque display section can be seen with the cover partially opened and the cover attached.
3) The torque wrench according to the above 1) or 2), wherein a conical mandrel is provided on the tip side of the cover. 4) The structure is such that the adjusting operation unit rotates the rotating shaft to adjust the torque. The rotary shaft is provided with an engaging hole orthogonal to the axial direction, and the core of the removed cover is passed through the engaging hole so that the cover can be used as a rotating handle of the adjusting operation unit. ).

[0005]

According to the present invention, when the torque for tightening the tightening member exceeds the tightening torque adjusted by the torque adjusting mechanism, the tightening member can be tightened at the set tightening torque by the torque idling mechanism that idles. By providing a cover that covers the adjustment operation section of the torque adjustment mechanism of the torque wrench, the adjustment operation section does not touch an object or a hand during work, and the tightening torque does not change during work. If the torque display unit for displaying the adjusted torque value is provided and a part of the cover is opened, the torque display unit can be seen from the opening provided in the cover with the cover attached. In the case where a conical mandrel is provided on the tip side of the cover, a torque wrench can also be used as the mandrel. The adjustment operation section rotates the rotary shaft to adjust the torque, and the rotary shaft is provided with an engaging hole orthogonal to the axial direction. The cover can be used as a handle for rotating the adjustment operation unit.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The idling mechanism and torque adjusting mechanism of the torque wrench of the present invention may be of any type.
The cover may be made of metal, resin, wood, or the like, and is preferably made of metal when a core is provided at the tip end of the cover. The mandrel is also called a shino, and when the metal plates provided with bolt mounting holes are overlapped and the positions of the bolt mounting holes are adjusted, Can be used to make the positions of the mounting holes match. In the present invention, the fastening groove is provided in the mounting hole, and the fastening member is directly attached to the mounting hole. However, in order to cope with the fastening member of various sizes, another fastening tool or the like may be interposed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described with reference to the drawings. In the embodiment shown in FIGS. 1 to 7, the adjustment operation unit of the torque adjustment mechanism is provided at one end of the handle remote from the mounting unit, a cover that covers the adjustment operation unit is detachably provided, and the adjusted torque value is displayed. An example of a torque wrench having a structure in which a torque display portion is provided, a conical mandrel portion is provided on the distal end side of the cover, the adjustment operation portion rotates to adjust the torque, and an engagement hole is provided in the adjustment operation portion. It is. FIG. 1 is a plan view of the torque wrench of the embodiment. FIG. 2 is a side view of the torque wrench. FIG. 3 is a sectional view of the torque wrench of the embodiment.
FIG. 4 is a sectional view of the torque wrench of the embodiment. FIG. 5 is an explanatory diagram of a state where the cover of the torque wrench of the embodiment is removed. FIG. 6 is an explanatory diagram illustrating a state in which the adjustment operation unit is rotated using the cover of the torque wrench according to the embodiment. FIG. 7 is an explanatory view showing a state in which the mandrel of the torque wrench of the embodiment is used. In the figure, 1 is a torque wrench, 2 is a mounting portion, 2a is a mounting hole, 2b is an engagement groove, 2c is a gear, 3 is a head portion, 3a is a slit, 4 is a handle, 4b is a mounting ring, and 4c is a screw portion. 5 is a torque idle rotation mechanism, 5a is an engagement claw, 5b is an engagement claw, 5c is a shaft, 5d is a claw, 5e is a switching claw, 5f is a ball, 5g is a spring, 5h is a slide, 6
Is a torque adjustment mechanism, 6a is an operation unit, 6b is an engagement hole, 6c
Is a screw portion, 6d is a slide scale portion, 6e is a scale, 6f is a screw hole, 6g is a spring engagement portion, 6h is a slide portion, 6i is a spring engagement portion, 6j is a slide ring, 6k is a spring, 6l.
Is a stopper portion, 7 is a connecting portion, 8 is a cover, 8a is a mandrel, 8b is an opening, 8c is an engagement claw, 8d is a screw portion, b is a bolt, t is an iron plate, and h is a hole.

The embodiment is an example of a torque wrench for directly tightening a hexagon bolt with the mounting hole 2a. First, as shown in FIGS. 1 to 7, the torque wrench 1 of the embodiment has a cylindrical mounting portion 2.
Is provided, and a cylindrical inner peripheral portion of the mounting portion 2 is defined as a mounting hole 2a. Next, an engagement groove 2b capable of engaging with a hexagonal bolt or nut of a predetermined size is provided in the lower portion of the inner periphery of the mounting hole 2a. In the engagement groove 2b of the torque wrench 1 of the embodiment, one groove has an angle of 120 °, and the grooves are provided at 12 positions at equal angles in the circumferential direction. Next, a gear 2c is provided on the upper outer peripheral side of the mounting portion 2. As shown in FIG. 4, the gear 2c is provided with a number of V-shaped grooves at equal angular intervals on the outer periphery to form the gear 2c. Next, a through hole having a larger diameter at a predetermined interval from the outer periphery of the mounting portion 2 is provided on the distal end side of the head portion 3, and a predetermined width is provided at a central portion of the thickness from the distal end side to a predetermined position as shown in FIG. Is provided. The mounting part 2 is inserted into the through hole of the head part 3, and the mounting part 2 is mounted on the head part 3 so that the gear 2c is positioned in the slit 3a. The mounting portion 2 is rotatably mounted on the head portion 3 so that the outer diameter of the gear 2c is larger than the through hole of the head portion 3, and furthermore, the mounting portion 2 is axially moved only by a predetermined gap. It is possible. Next, a cylindrical handle 4 is connected to the rear end of the head 2 as shown in FIGS. By attaching the handle 4 to the rear end of the head portion 3, the central axis of the handle 4 and the central axis of the mounting hole 2a are orthogonal to each other. Next, the torque idling mechanism 5 is provided. First, as shown in FIGS. 1, 2, and 4, a slit 3a behind the mounting portion 2 of the head portion 3 is provided.
Is provided with an engaging claw portion 5a. The engaging claw portion 5a is rotatably attached to a substantially central portion by a shaft 5c penetrating vertically through the slit 3a. The engagement claw portion 5a has a symmetrical shape from the center where the shaft 5c is attached. At the front end portion of the engagement claw portion 5a on the gear 2c side, engagement claw 5b that engages with the V-shaped groove of the gear 2c is provided at symmetrical positions. Next, the switching pieces 5e are provided at symmetrical positions on the handle side of the engaging claw 5b of the engaging claw 5a. The switching piece 5e is provided such that the left and right ends protrude left and right from the head unit 3. Next, a triangular claw 5d projecting rearward is provided at the rear end of the engagement claw 5a. Next, as shown in FIG. 4, a slide portion 5h is provided which projects from the inner peripheral portion of the cylindrical handle 4 toward the head portion 3 by a predetermined amount and is slidable with an outer diameter smaller than the inner periphery of the handle 4. A ball mounting hole having a predetermined depth is provided on the front end face of the slide portion 5h on the head portion 3 side. Next, a spring 5g is inserted into and attached to the ball mounting hole, and a ball 5f is mounted on the tip of the spring 5g. Next, a torque adjusting mechanism 6 is provided. First, as shown in FIG. 3, a slide portion 6h is provided on the inner periphery of the thin tubular portion 4e of the handle 4 at a position away from the head portion 3 of the slide portion 5h.
A spring engaging portion 6i projecting with a small diameter is provided at the rear end of the slide portion 6h. Next, a groove is provided at a predetermined width and depth on a part of the outer periphery of the slide portion 6h, and a rubber slide ring 6j is attached to the groove. The slide ring 6j has an inner and outer diameter and a ring thickness that are compressed by the groove of the slide portion 6h and the inner periphery of the thin tubular portion 4e. Next, a spring 6k is provided inside the thin tubular portion 4e in a direction away from the head portion 3 from the slide portion 6h. A slide portion 6 is attached to the end of the spring 6k.
h into the slide portion 6
h. Next, the spring 6 is set inside the thin tubular portion 4e.
Slide scale 6d in the direction away from head 3 from k
Is provided. The slide graduation 6d has an outer diameter and a shape slidable with respect to the inside of the thin tubular portion 4e. The slide scale 6d is provided with a scale 6e for indicating a tightening torque as shown in FIG. 6d slide scale
And a screw hole 6f penetrating in the direction of the central axis which is the same direction as the sliding direction. The end of the slide scale portion 6d on the head portion 3 side is provided with a spring engaging portion 6g in which a screw hole 6f is formed in a small diameter ring shape and protrudes toward the head portion 3 side. The spring engaging portion 6g is fitted into the end of the spring 6k, and the slide scale 6d is attached to the spring 6k. Next, an operation portion 6a is provided in a direction away from the head portion 3 from the slide scale portion 6d inside the thin tubular portion 4e. The diameter of a part of the operation portion 6a is set to be a stopper portion 61 having a diameter smaller than the inner circumference of the thin tubular portion 4e by a predetermined gap. At the front end of the operation section 6a, a screw section 6c having a small diameter and protruding is provided. At the rear end of the operation portion 6a, a portion having a smaller diameter than the stopper portion 6l is provided, and an engagement hole 6b orthogonal to the rotation axis of the operation portion 6a is provided at this protruding portion. The screw portion 6c is connected to the slide scale portion 6
Then, the operation part 6a is attached to the slide scale part 6d by screwing into the screw hole 6f of d to a predetermined position. The rear end of the handle 4 has a thin tubular portion 4e projecting from the handle 4 as shown in FIGS. Further, the operation unit 6a
The projecting portion provided with the engaging hole 6b is projected from the rear end of the thin tubular portion 4e, and the ring-shaped rear end surface portion is attached to the rear end of the thin tubular portion 4e.
The portion provided with the engagement hole 6b is made to protrude as a stopper for being located in the inside e. The operation section 6a and the slide scale section 6d constitute an adjustment operation section.

Next, the sliding portion 6h and the sliding portion 5h are connected by the connecting portion 7. The connecting portion 7 is connected to the sliding portion 6h and the sliding portion 5h by a rotatable shaft, and the rear end of the sliding portion 5h and the front end of the sliding portion 6h connected by the connecting portion 7 are thin tubular portions. The coaxial position can be shifted inside. Next, as shown in FIG. 3, a thin tubular portion and an inner circumferential portion of the handle 4 are provided with an annular groove over the entire circumference at a predetermined gap and depth at an end portion of the handle 4 at a side remote from the head portion 3. A mounting ring retainer 4d is formed, one end of the mounting ring retainer 4d is inserted into an annular groove and attached to the handle 4, and the outer peripheral portion of one end of the mounting ring retainer 4d opposite to the side attached to the handle 4 is formed to have a diameter. Increase the shape. Further, engaging recesses of a predetermined shape are provided at two symmetrical positions of 180 ° on the end surface of the mounting ring retainer 4d opposite to the side attached to the handle 4. Next, a ring-shaped mounting ring 4b is provided so that the outer circumference of the mounting ring retainer 4d is inserted into the inner circumference of the mounting ring 4b,
At the end of the mounting ring 4b on the side of the head 3 into which the mounting ring retainer 4d is inserted, a portion having a reduced inner diameter is provided, and is engaged with a portion having an increased outer diameter of the mounting ring retainer 4d, so that the mounting ring 4b is attached to the handle 4. Attach it freely. A screw portion 4c is provided on the inner periphery of the mounting ring 4b. Next, FIG.
A cover 8 is provided as shown in FIGS. On the outer periphery of one end of the cover 8, there is provided a screw portion 8d which can be screwed and attached to the screw portion 4c on the inner periphery of the mounting ring 4b. Next, on the end face of the cover 8 provided with the threaded portion 8d, engaging claws 8c having a shape capable of engaging with the engaging recess of a predetermined shape are provided at two symmetrical positions of 180 °. A conical mandrel 8a is provided at one end of the cover 8 opposite to the thread 8d. Next, an opening 8b is provided at a predetermined position of the cover 8.

In order to use the torque wrench 1 of this embodiment, first, the tightening torque, which is the upper limit of the tightening with the torque wrench 1, is changed to a predetermined value. The person who works is the cover 8
6 is detached from the torque wrench, the mandrel 8a of the cover 8 is inserted into an engagement hole 6b provided in the operation portion 6a as shown in FIG.
, And using the cover 8 as a rotating lever,
The operation unit 6a is rotated. When the operation part 6a rotates, the screw part 6c of the operation part 6a becomes the screw hole 6 of the slide scale part 6d.
Since it is engaged with f, the screw portion 6c becomes a feed screw and the slide scale portion 6d moves. Since the spring engagement part 6g moves by moving the slide scale part 6d, the length between the spring engagement part 6g and the spring engagement part 6i changes. Therefore, the mounting length of the spring 6k changes, and the repulsive force due to the compression of the spring changes. The scale 6e is provided on the slide scale 6d. The worker rotates the cover 8 while looking at the scale 6e. When the slide scale 6d slides, the scale 6e moves and the value changes. Since the amount of change in the total length of the compressed spring from the predetermined mounting state of the spring 6k and the load are linearly proportional, the change in the scale can be regarded as the change in the load. Next, when the tightening torque is adjusted in this manner, the cover 8 is attached to the rear end of the handle 4. The screw portion 8d of the cover 8 is fitted on the inner peripheral side of the mounting ring 4b to the outer peripheral side of the thin tubular portion of the handle 4, and the mounting ring 4b
Is rotated, and the cover 8 is attached to the rear end of the handle 4 such that the cover 8 is sent to the screw portion 8d. With the cover 8 attached to a certain extent, the opening 8b of the cover 8 is rotated to match the scale 6e, the rotational position of the engaging recess of the handle 4 and the engaging claw 8c of the cover 8 is adjusted, and the mounting ring 4b is further rotated. Then, send it with a screw and engage the claw 8 of the cover 8.
The cover 8 is attached to the handle 4 such that c fits into the engagement recess of the handle 4. By engaging the engaging claw 8c of the cover 8 with the engaging concave portion, the cover 8 is
, And can be made into an integrated state that does not rotate. In this state, since the scale 6e can be seen from the opening 8b of the cover 8, it is possible to confirm that the adjusted tightening torque value and the value have not changed during the work. Also,
Since the operation unit 6a is covered with the cover 8 by attaching the cover 8 in this manner, the operation unit 6a does not rotate during the operation and the adjusted tightening torque value does not change.

After adjusting the value of the tightening torque in this way, the hexagonal bolts, nuts and the like are tightened using the torque wrench 1 of the present embodiment. The torque wrench 1 can change the tightening direction so that the torque wrench 1 can be used when using a reverse screw in which the direction of rotation of the screw is reversed, or when loosening a tightened hexagon bolt or nut. . FIG.
In the state shown in FIG. 6, a hexagon bolt or nut is fitted into the mounting hole 2a, and the handle 4 is rotated and tightened with the engaging groove 2b of the mounting hole 2a engaged with the corner of the hexagon bolt or nut. Attach. In the state shown in FIG. 4, when the handle 4 is rotated so as to rotate the mounting portion 2 and the gear 2c integrated with the mounting portion 2 in the clockwise direction, the V groove on the tooth surface of the gear 2c is clockwise. Due to the rotational movement, the engaging claw 5b engaged with the V groove of the gear 2c receives a force to move downward. Since the engagement claw 5a is rotatable about the shaft 5c, the engagement claw 5a rotates counterclockwise with respect to the shaft 5c. Then, the claw 5d provided on the handle 4 side of the engagement claw 5a pushes the ball 5f. The ball 5f is attached to the slide portion 5h by a spring 5g, and the slide 5h is connected to the slide portion 6h subjected to the force by the repulsive force of the spring 6k by the connecting portion 7, so that the ball 5f is adjusted by tightening. The pawl 5d is pressed with a force corresponding to the torque. Therefore, when the mounting portion 2 rotates clockwise below the tightening torque, the engagement claw portion 5 is pressed by the ball 5f and cannot rotate, so that the tightening can be performed with the rotated torque.
If the mounting portion 2 is rotated clockwise with a force exceeding the tightening torque, the force of the claw 5d of the engaging claw portion 5a pressing the ball 5f exceeds the force of the ball 5f pressing the claw 5d. 5f moves, and the engagement claw portion 5a rotates counterclockwise. At this time, when the engagement claw portion 5a rotates until the engagement claw 5b does not engage with the V groove of the gear 2c, the gear 2c is free and idles. By rotating in this manner, the mounting portion 2 does not rotate so as to tighten with a torque exceeding the tightening torque. Tightening can be performed with the adjusted tightening torque. When the mounting portion 2 is rotated counterclockwise in this state, the engaging claw 5b engaged with the V groove of the gear 2c receives a force upward, and the engaging claw 5a rotates clockwise with respect to the shaft 5c. Try to rotate. At this time, the claw 5d of the engagement claw portion 5a moves in a direction away from the ball 5f, so that the mounting portion 2 idles. Even if the angle range in which the handle 4 can be moved when tightening with the torque wrench 1 is only a small amount, tighten the handle a little, rotate the handle 4 back to idle, and tighten the handle 4 like a pendulum. Can be reciprocated for tightening. In addition, in the state of FIG. 4, the switching claw 5e of the engagement claw 5a is held by a finger, and the engagement claw 5a which is not engaged with the gear 2c is engaged with the gear 2c. If it is rotated, the rotation direction in which the tightening torque of the mounting portion 2 is applied is reversed, so that it can be used when loosening a hexagon bolt or nut or when tightening a reverse screw. Further, in the torque wrench 1 of the present embodiment, the cover 8 is provided with the mandrel 8a. In a case where two iron plates t are overlapped with the torque wrench 1 and holes h of the iron plates t are overlapped and fastened with bolts and nuts, and the iron plates t are attached to each other, the iron plates t are stacked as shown in FIG. The displacement of the hole h of the iron plate t can be corrected by inserting the mandrel 8a into the hole h. As described above, according to the related art, it is very convenient because it is necessary to carry two torque wrenches and a mandrel by only carrying one torque wrench 1.

FIG. 8 shows another example of the embodiment.
FIG. 8 is an explanatory diagram showing a state in which the adjustment operation unit is rotated using a cover of another example of the torque wrench of the embodiment. In the figure, 11 is an engagement groove, and 12 is a driver part. In another example of the embodiment, as shown in FIG.
e, an engagement groove 11 is provided in a portion protruding therefrom, and a driver portion 12 which can be used as a flathead screwdriver is provided in a tip portion of the cover 8. In this manner, the tip of the cover may be used as a driver, and the driver unit 12 may be used to rotate the operation unit to change the tightening torque. Other symbols, configurations, operations, and usages are the same as those of the embodiment.

[0013]

According to the present invention, it is possible to provide a torque wrench capable of keeping the tightening torque adjusted during operation. A torque display unit that displays the adjusted torque value is provided, and the cover has a structure that covers the torque display unit and the adjustment operation unit.Those with a part of the cover opened can check the torque that was easily adjusted during work, In addition, it is possible to confirm whether the torque adjusted during the operation has not changed, and it is possible to more reliably perform the tightening operation with the predetermined tightening torque. When the cover is provided with a conical mandrel on the tip side, the cover of the torque wrench can also be used as a mandrel, and only one tool needs to be carried, which is convenient. The structure in which the adjusting operation section rotates the rotating shaft to adjust the torque, and the rotating shaft provided with an engagement hole orthogonal to the axial direction can use the cover as a rotating handle of the adjusting operating section, Easy to use torque wrench.

[Brief description of the drawings]

FIG. 1 is a plan view of a torque wrench according to an embodiment.

FIG. 2 is a side view of the torque wrench of the embodiment.

FIG. 3 is a sectional view of the torque wrench of the embodiment.

FIG. 4 is a sectional view of the torque wrench of the embodiment.

FIG. 5 is an explanatory diagram of a state where a cover of the torque wrench of the embodiment is removed.

FIG. 6 is an explanatory diagram illustrating a state in which an adjustment operation unit is rotated using a cover of the torque wrench according to the embodiment.

FIG. 7 is an explanatory diagram showing a state in which a mandrel of the torque wrench of the embodiment is used.

FIG. 8 is an explanatory diagram showing a state in which the adjustment operation unit is rotated using a cover of another example of the torque wrench of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torque wrench 2 Mounting part 2a Mounting hole 2b Engaging groove 2c Gear 3 Head part 3a Slit 4 Handle 4a Missing number 4b Mounting ring 4c Screw part 4d Mounting ring presser 4e Thin tubular part 5 Torque idling mechanism 5a Engagement claw part 5b Engagement Claw 5c Shaft 5d Claw 5e Switching piece 5f Ball 5g Spring 5h Slide part 6 Torque adjusting mechanism 6a Operation part 6b Engagement hole 6c Screw part 6d Slide scale part 6e Scale 6f Screw hole 6g Spring engagement part 6h Slide part 6i Spring engagement Part 6j Slide ring 6k Spring 6l Stopper part 7 Connecting part 8 Cover 8a Mandrel part 8b Opening 8c Engaging claw 8d Screw part 9 Missing number 10 Missing number 11 Engaging groove 12 Driver part b Bolt t Iron plate h hole

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Sadao Sumoto 4-2-1-11 Ogasagawa, Onojo-shi, Fukuoka Prefecture F-term in Nagasaki Noritz Trading Co., Ltd. 3C038 AA03 BC01 CA06 CC08 EA01 EA02 EA06

Claims (4)

[Claims] An attachment portion provided with an attachment hole for engaging a fastening member is rotatably provided on a head portion, and a handle extending toward an outer peripheral direction of the attachment hole is connected to the head portion;
A torque idling mechanism that engages so as to idle when a torque exceeding a set tightening torque is applied to the mounting portion is provided, a torque adjusting mechanism for changing the tightening torque is provided on the handle side, and a tightening member is engaged with the mounting hole. A torque wrench for tightening the handle so that the torque does not exceed a set tightening torque by rotating the handle in combination with an adjusting operation part of the torque adjusting mechanism provided at one end of the handle at a side remote from the mounting part, A torque wrench characterized in that a cover for covering the part is detachably provided. 2. The torque display unit according to claim 1, wherein a torque display unit for displaying the adjusted torque value is provided on the adjustment operation unit, and a part of the cover is opened so that the torque display unit can be seen with the cover attached. Torque Wrench. 3. The torque wrench according to claim 1, wherein a conical mandrel is provided on a tip side of the cover. 4. A structure in which an adjusting operation section rotates the rotary shaft to adjust the torque, wherein the rotary shaft is provided with an engaging hole orthogonal to the axial direction, and the removed cover mandrel is connected to the engaging hole. 4. The torque wrench according to claim 3, wherein the cover can be used as a handle for rotating the adjusting operation section by penetrating the cover.