TWI741132B - Torque driver - Google Patents

Abstract

[Problem] The present invention provides a torsion driver that can adjust the torque gradient caused by the spring constant of the coil spring. [Solution] The torsion screwdriver (10) of the present invention is equipped with: a spindle (30), which can be equipped with accessories at the front end; a barrel part (20), which keeps the spindle free of rotation; a coil spring (60), which holds the spindle Bounce toward the base end of the cylinder; the holding member (32) is a holding member formed on the base end side of the main shaft and rotates with the main shaft. It has a holding member for holding the base end of the coil spring and opening toward the base end The hole (33); the pop-up member (35) is provided in the holding hole; and the base end member (40) is provided at the base end of the barrel. The torque driver has a torque gradient adjustment means (70), which contains: The torque gradient adjustment hole (76) is a position where the opening is provided on the inner surface of the base end member and is opposite to the rotational movement path of the ejection member, so that a part of the ejection member can invade; and the torque gradient adjustment member (73), It is fitted with the torque gradient adjustment hole to adjust the depth of the pop-up member intruding into the torque gradient adjustment hole.

Description

Torque screwdriver

The present invention relates to a torque driver that can be locked with a desired locking torque, and more specifically, to a torque driver that can adjust the torque gradient of a coil spring used to push a spindle.

A coil spring type torsion driver that can be used to lock screws and other structural parts with a desired set torque is known. In this type of torsion driver, a coil spring pushes the spindle with respect to the clamp portion, and the spindle has a ball that fits into a recess provided in the clamp portion. Moreover, when locking the associated structure, if a locking torque greater than the set locking torque is applied between the spindle and the clamp portion, the elastic thrust of the coil spring will be resisted and the ball will be detached from the recess, causing the spindle to react to the The clamp part is idling. In this way, an appropriate locking torque of the locking member is ensured (for example, refer to Patent Document 1).

Inside the clamp part, there is a slider that adjusts the length (compression length) of the compressed state of the coil spring. The position of the slider is moved along the main axis, thereby changing the compression length of the coil spring and the lock can be set. Fixed torque. The set locking torque and the compression length of the coil spring are proportional relations with the spring constant of the coil spring as a coefficient as shown by the line A in FIG. 7. [Prior Technical Documents] [Patent Documents]

[Patent Document 1] Japanese Mikko Sho 39-25090 Gazette

[The problem to be solved by the invention]

However, there is a deviation in the spring constant of the coil spring. Therefore, even if the torque driver of the same specification, for example, as shown by the line B in Figure 7, the gradient (called "torque gradient") is different, there is a problem that even if the slider is moved in the same way, it cannot be set to the same The problem of locking torque.

The object of the present invention is to provide a torsion driver which can adjust the torque gradient caused by the spring constant of the coil spring. [Means to solve the problem]

In order to solve the above problems, the torsion screwdriver of the present invention is equipped with: 　　 spindle, which can be attached to the front end; 　　 tube part, to hold the spindle freely rotatably; 　　 coil spring, to bounce the spindle toward the base end of the tube part ; 　　 holding member is a holding member formed on the base end side of the main shaft and rotating together with the main shaft, and is provided with a holding hole for holding the base end of the coil spring and opening toward the base end side; 　　 ejecting member is provided in The holding hole; and the base end member are provided at the base end of the cylindrical portion. The torque driver has a torque gradient adjustment means, and includes: a torque gradient adjustment hole, which is an opening provided on the inner surface of the base end member and The position opposite to the rotational movement path of the ejection member, so that a part of the ejection member can invade; and the torque gradient adjustment member is fitted with the torque gradient adjustment hole to adjust the intrusion of the ejection member to the torque gradient adjustment The depth of the hole.

The torque gradient adjusting means includes: a 　　 torque gradient adjusting concave portion, which is recessed on the proximal side of the base end member and communicates with the torque gradient adjusting hole; and a torque gradient adjusting operation piece is fitted to the torque gradient adjusting concave portion , The position of the torque gradient adjustment member can be adjusted along the direction of the main shaft, 　　 by operating the torque gradient adjustment operating piece, the torque gradient adjustment member can be moved in the torque gradient adjustment hole, and the ejection can be adjusted The depth of the component intrusion into the aforementioned torque gradient adjustment hole is better.

The holding holes are formed in plural in the holding member, and the torque gradient adjustment holes may be formed in the same number or multiples as the holding holes.

It is preferable that the base end member can be adjusted in position with respect to the cylindrical portion in the direction along the main axis.

The front end of the aforementioned coil spring can be held by a slider that can slide with respect to the aforementioned cylindrical portion. [Effects of the invention]

According to the torsion driver of the present invention, the eject member is provided in the holding member that rotates together with the main shaft, but can partially intrude into the torque gradient adjustment hole of the base end member. The intrusion depth of the pop-up member is adjusted by the torque gradient adjustment member, thereby adjusting the force necessary for separating the pop-up member from the torque gradient adjustment hole. By adjusting the force, the torque gradient caused by the spring constant of the coil spring can be corrected, and a torsion screwdriver that can guarantee approximately the same locking torque even if the spring constant of the coil spring is deviated can be provided.

Hereinafter, the torque driver 10 according to an embodiment of the present invention will be described with reference to the drawings. In addition, in the following description, the "base end" refers to the clamp portion 40 side of the torque driver 10 shown in FIG. 1, and the "tip" refers to the opposite side. In addition, the so-called “axial direction” refers to a direction along the main axis 30.

Fig. 1 is a plan view of a torque driver 10 according to an embodiment of the present invention. The torque driver 10 has a clamp portion 40 on the base end side of a cylindrical tube portion 20, a torque setting dial 50 at the tip, and a spindle 30 protruding from the torque setting dial 50 to which accessories such as a screwdriver can be attached. An elongated hole 22 is provided in the trunk portion of the cylindrical portion 20, and a scale 24 for torque setting is added to the side of the elongated hole 22. The elongated hole 22 is provided with a torque indicating protrusion 57 that slides in the axial direction by the rotation of the torque setting dial 50. Rotating the torque setting dial 50 allows the torque indicating protrusion 57 to fit the scale 24, thereby setting it as desired Locking torque.

Fig. 2 is a cross-sectional view taken along the line II-II of Fig. 1. As shown in the figure, the cylindrical part 20 is hollow, and the clamp part 40 is screwed on the outer periphery of the base end side. The above-mentioned long hole 22 is provided in the opening of the trunk portion of the cylinder portion 20, and an inward flange is protrudingly provided on the front end side, so that the torque setting screw 52 is slidably fitted.

The main shaft 30 is a rod-shaped member penetrating the torque setting dial 50 and the cylindrical portion 20, and a socket 31 for attaching a fitting is recessed at the front end. On the base end side of the main shaft 30, a ball holding bush 32 and a spring receiving bush 37 constituting a holding member are attached.

The ball retaining bush 32 is formed to be rotatable together with the main shaft 30 as shown in FIGS. 2 and 3 and has a flange protruding toward the outer periphery, and a ball retaining hole 33 is provided in the flange. The front end of the ball holding hole 33 is closed by the spring receiving bush 37, and the ball 35, which is the ejection member, is partially extended from the base end to be accommodated. In the illustrated embodiment, there are three ball holding holes 33, which are provided at equal intervals on a concentric circle centered on the main shaft 30, and balls 35 are accommodated in each of the ball holding holes 33.

The spring receiving bush 37 is a flange that is rotatably fitted to the main shaft 30 and protrudes toward the outer periphery. It holds the base end of the coil spring 60 and abuts against the ball holding bush 32 to block it as described above. The front end side of the ball holding hole 33.

In addition, in the present embodiment, although the holding member is constituted by two members of the ball holding bush 32 and the spring receiving bush 37, of course, these may be constituted by one member. In this case, the ball holding hole 33 only needs to be directly recessed and provided with a bottom hole in the holding member.

The main shaft 30 is fitted with a coil spring 60. The coil spring 60 is a compression spring. The base end of the coil spring 60 is in contact with the spring receiving bush 37 attached to the main shaft 30, and the front end thereof is in contact with the slider 55 described later.

The torque setting dial 50 is provided at the front end of the cylindrical portion 20, and a torque setting screw 52 penetrates the inside. The torque setting dial 50 and the torque setting screw 52 can be rotated together by a fixing screw 53. The torque setting screw 52 is rotatably fitted into the main shaft 30, and a thread is engraved on the outer periphery of the base end side. The torque setting screw 52 is protrudingly provided with an anti-dropping member so as not to fall off from the cylinder portion 20.

On the torque setting screw 52, a sliding member 55 screwed with the engraved thread is installed. The slider 55 holds the front end of the aforementioned coil spring 60. In addition, the slider 55 is provided with a torque indicating protrusion 57 that moves in the long hole 22 of the cylindrical portion 20 protrudingly.

When the torque setting dial 50 is rotated with respect to the cylinder portion 20, the torque setting screw 52 rotates together, and the sliding member 55 is moved in the axial direction by the screw thrust to change the compression length of the coil spring 60 to adjust the locking torque. In addition, the torque indicating protrusion 57 is moved along the long hole 22 together with the slider 55, and the set locking torque can be confirmed visually.

The base end of the cylindrical part 20 is provided with a base end member that also serves as the clamp part 40.

In this embodiment, the clamp unit 40 has a zero point adjustment function of the locking torque and an adjustment function of the torque gradient of the coil spring 60.

As shown in FIG. 1, the jig part 40 is formed by applying a slippery roll processing to the outer periphery. In the clamp portion 40, as shown in FIG. 2, a concave portion 42 screwed to the barrel portion 20 is formed on the base end side, and as shown in FIGS. 2 and 4, a torque gradient adjustment operating piece is formed on the tip end side. The recesses 44 screwed by the torque gradient adjustment screw 71 are separated by a plate 43 formed from the clamp portion 40 inward. The clamp part 40 is fixed to the cylinder part 20 by a fixing screw 46, and the torque gradient adjustment screw 71 is fixed to the clamp part 40 by a fixing screw 48.

In the plate 43, as shown in FIGS. 2 and 5, the opening is provided with a torque gradient adjustment hole 76 through which the balls 35 can partially invade, and a shaft hole 79 into which the base end of the main shaft 30 is rotatably inserted.

The torque gradient adjustment hole 76 is a through hole, and is formed on the traveling path of the ball 35 fitted into the ball retaining hole 33 when the ball retaining bush 32 is rotated. In the illustrated embodiment, the holding holes 33 are formed concentrically with respect to the main shaft 30 at three equal intervals, but the torque gradient adjustment holes 76 are formed at equal intervals on the same concentric circle. This is because when the torque driver 10 reaches the set locking torque, the idling angle is set to 60°. When the torque gradient adjustment holes 76 are set to the same three as the holding holes 33, the idling angle becomes 120°.

In the torque gradient adjustment hole 76, a torque gradient adjustment pin 73 serving as each torque gradient adjustment member is fitted. The torque gradient adjustment pin 73 is a member that adjusts the depth d of the penetration depth d of the ball 35 into the torque gradient adjustment hole 76. The base end side of the torque gradient adjustment pin 73 can be abutted against the front end side of the disc-shaped pressing plate 77 inserted into the recess 44, or may be formed integrally with the pressing plate 77. The base of the pressing plate 77 The end side surface is abutted with the torque gradient adjustment screw 71 screwed into the recess 44.

In more detail, the torque gradient adjustment pin 73, even if the pressing plate 77 is moved to the foremost side, its tip does not protrude from the torque gradient adjustment hole 76, and its maximum length is equal to the depth of the torque gradient adjustment hole 76 The same, that is, the thickness of the pressing plate 77. Moreover, the maximum value of the ball penetration depth d of the torque gradient adjustment hole 76 adjusted by the torque gradient adjustment pin 73 is the radius of the ball 35. This is because if the ball 35 intrudes into the torque gradient adjustment hole 76 by more than a radius, the ball 35 cannot escape from the torque gradient adjustment hole 76.

The torque gradient adjustment screw 71 is formed with a tool insertion hole 72 as shown in FIG. 2 and FIG. Thereby, it can move in the axial direction in the recess 44.

Furthermore, with respect to the clamp part 40, the fixing screw 46 is loosened to rotate the clamp part 40 with respect to the cylindrical part 20. Thereby, the clamp part 40 moves the torque gradient adjustment pin 73 back and forth in the axial direction while maintaining the depth d of the torque gradient adjustment hole 76. If the clamp part 40 is rotated in the locking direction, the clamp part 40 moves to the tip side of the cylinder part 20, so the torque gradient adjustment pin 73 pushes the spindle 30 to the tip side through the ball 35, so that the coil spring 60 is compression. Conversely, if the clamp part 40 is rotated in the loosening direction, the clamp part 40 moves to the base end side, so the coil spring 60 will expand.

In addition, with respect to the clamp portion 40, if the torque gradient adjustment screw 71 is rotated by a tool such as a wrench, the torque gradient adjustment screw 71 moves in the axial direction within the recess 44. If the torque gradient adjustment screw 71 is rotated in the locking direction, the torque gradient adjustment screw 71 pushes in the torque gradient adjustment pin 73 from the state of Fig. 6(a) to the front end side by pressing the plate 77, as shown in the figure As shown in 6(b), the depth d of the torque gradient adjustment hole 76 is made shallow. Conversely, if the torque gradient adjustment screw 71 is rotated in the loosening direction, the torque gradient adjustment screw 71 moves the torque gradient adjustment pin 73 from the state of Fig. 6(b) to the proximal side, as shown in Fig. 6(a) In general, the depth d of the torque gradient adjustment hole 76 is made deeper. In this way, the penetration depth d of the ball 35 that penetrates into the torque gradient adjustment hole 76 is adjusted.

<Locking of structural parts> 　　The torque driver 10 of the above-mentioned structure is used for fixing structural parts such as screws and bolts. The steps are as follows.

First, the torque setting dial 50 is rotated with the ball 35 fitted in the torque gradient adjustment hole 76, and the slider 55 is slid by the screw thrust of the torque setting screw 52 that rotates together to change the compression length of the coil spring 60. Instead, change the locking torque. The locking torque can be adjusted while visually observing the scale 24 indicated by the torque indicating protrusion 57. Then, accessories such as a screwdriver are attached to the socket 31, and the clamp part 40 is held to perform the locking operation.

Fig. 6 is an enlarged cross-sectional view of the vicinity of the ball 35 of the torque gradient adjusting means 70. In the figure, the upper side is the ball retaining bush 32, and the lower side is the plate 43. The ball 35 is pushed in the arrow F1 direction by the elastic force of the coil spring 60, and abuts against the torque gradient adjustment pin 73.

When the locking is performed in this state, before the locking torque reaches the set locking torque, as shown in FIG. 6, the force F1 that pushes the ball 35 in the axial direction with respect to the coil spring 60 is obtained by The force acting between the clamp portion 40 and the spindle 30 for locking is a force F2' (the number of balls 35) that moves in the tangential direction of the circle centered on the spindle 30 in a horizontal plane orthogonal to the axial direction. In the case of a plural number, the force is divided by the number of balls 35) to act. With this force F2', the ball 35 abuts against the opening edge 76a of the torque gradient adjustment hole 76.

That is, the resultant force of the force F1 and the force F2' acts on the ball 35. If the resultant force becomes equal to or greater than the resultant force F3 of the force F2 and the force F1 necessary for the ball 35 to pass the opening edge 76a, the ball 35 will pass the opening edge 76a. In other words, if the locking torque generated by the locking acts on the ball 35 with a force greater than F2, the ball 35 will resist the elastic thrust of the coil spring 60 and escape from the torque gradient adjustment hole 76 and run to the plate. 43, the clamp unit 40 is idling with respect to the spindle 30. Thereby, it can be confirmed that the locking member is closed with a predetermined concluding torque.

In the above-mentioned locking operation, in order to ensure the correct locking torque, it is necessary to adjust the torque driver 10 before the locking operation. In this embodiment, this adjustment is zero point adjustment and torque gradient adjustment.

<Zero point adjustment> The "zero point adjustment" is to rotate the torque setting dial 50, for example, to move the torque indicating protrusion 57 to the minimum value of the scale 24. Then, the adjustment is to set the torque driver 10 in the torque tester, and refer to the actual measurement value and the value of the scale 24 indicated by the torque indicating protrusion 57 to confirm whether the actual measurement value and the scale value as shown by the zero point in FIG. 7 are consistent. .

When the actual measurement value is aligned with the scale value and the zero point is passed as shown by the line A in FIG. 7, the torque gradient adjustment described later is performed. On the other hand, when there is an error between the actual measurement value and the value of the scale 24 (lines C, C'in Fig. 7), zero point adjustment is performed. The zero point adjustment is performed by loosening the fixing screw 46 and rotating the clamp part 40. When the actual measurement value is larger than the scale value (line C in FIG. 7), the clamp portion 40 is loosened to move the spring receiving bush 37 to the proximal side, and the coil spring 60 is extended and then the actual measurement is performed again to make the actual measurement The value is close to the scale value (zero point). Conversely, when the actual measurement value is smaller than the scale value (line C in FIG. 7), the clamp 40 is locked to move the spring receiving bush 37 to the tip side, and the coil spring 60 is shortened and then the actual measurement is performed again. The measured value is close to the scale value (zero point). The above is repeated to reach the zero point (line A in FIG. 7) where the actual measurement value matches the value of the scale 24.

Next, the torque setting dial 50 is rotated, for example, the locking torque is set to the maximum value and the same measurement is performed. If it is confirmed that the actual measurement value matches the scale value, the adjustment ends, and the scale value of the locking torque is guaranteed. As described above, when the zero point adjustment is completed by the adjustment of the torque setting dial 50, it is only when the spring constant of the coil spring 60 is a predetermined spring constant. That is, if the spring constant of the coil spring 60 is wrong, although the actual measurement value and the scale value will be the same for a certain locking torque, an error will occur between the actual measurement value and the scale value for other locking torques. Therefore, it is necessary to coordinate the zero point adjustment to perform the following torque gradient adjustment.

<Torque gradient adjustment> 　　 As mentioned above, if the spring constant of the coil spring 60 is a predetermined value in the torque driver 10 of the same specification, the torque gradient is also a predetermined value, so the lock can be set by performing zero point adjustment. Fixed torque. However, there is a deviation in the spring constant of the coil spring 60, and as a result, the torque gradient is different as shown by the line A and the line B in FIG. 7. Assuming that the line A is the desired set torque gradient, in the coil spring 60 of the line B whose spring constant (torque gradient) is different from that of the line A, although the zero point is aligned by zero point adjustment, if the torque is indicated If the protrusion 57 slides from the zero point to set different locking torques, the farther from the set zero point, the greater the difference between the scale value of the locking torque and the actual measured value (indicated by D in FIG. 7). Therefore, it is necessary to adjust the torque gradient of the coil spring 60.

Therefore, in the present invention, the torque gradient adjusting means 70 is used to adjust the depth d of the intrusion of the ball 35 into the torque gradient adjusting hole 76 to change the force necessary for separating the ball 35 from the torque gradient adjusting hole 76, and The line indicated by the line C in FIG. 7 is corrected to the torque gradient indicated by the line A (arrow E).

As shown in FIG. 6(a) and FIG. 6(b), the ball penetration depth d of the torque gradient adjustment hole 76 is larger than that of FIG. 6(a) than FIG. 6(b). If the ball penetration depth d changes, the force F2 necessary for the ball 35 to escape from the torque gradient adjustment hole 76 will also change. The deeper the ball penetration depth d is, that is, the ball 35 detaches from the side of Figure 6(b). A larger force F2 will be required. The ball penetration depth d is adjusted by turning the torque gradient adjustment screw 71. Specifically, if the torque gradient adjustment screw 71 is tightened from the state of FIG. 6(a), the torque gradient adjustment screw 71 moves toward the tip side, so the torque gradient adjustment pin 73 is pressed by the pressing plate 77 to be deep It penetrates deeply into the torque gradient adjustment hole 76. As a result, the torque gradient adjustment hole 76 moves the penetration depth d of the balls 35 in a direction (see FIG. 6(b)) to decrease. Conversely, from the state of FIG. 6(b), loosen the torque gradient adjustment screw 71, thereby moving the torque gradient adjustment screw 71 toward the proximal side, so the torque gradient adjustment pin 73 can increase the penetration depth d of the ball 35 Direction (refer to Figure 6(b)).

As described above, the adjustment ball 35 intrudes into the depth d of the torque gradient adjustment hole 76, whereby the force F2 of the ball 35 passing over the torque gradient adjustment hole 76 can be adjusted. As a result, the torque gradient of the coil spring 60 can be changed from FIG. 7 The slope shown by the line B is corrected to the one shown by the line A in FIG. 7 (arrow E).

Therefore, by repeatedly performing "zero point adjustment" and "torque gradient adjustment", the actual measured value of the coil spring 60 can be consistent with the scale value, and the torque gradient of the coil spring 60 can also be adjusted to a predetermined slope. Therefore, even if the coil spring 60 has a deviation, the scale value can be made to match the actual measurement value.

The above description is used to illustrate the inventors, and is not used to limit the invention described in the scope of the patent application, or to be interpreted as a limited scope. In addition, the structure of each part of the present invention is not limited to the above-mentioned embodiments, and various modifications are naturally possible within the scope of the technology described in the scope of the patent application.

For example, in the above-mentioned embodiment, although the number of holding holes 33 is three, the present invention can be realized as long as it is one or more. In addition, although the number of torque gradient adjustment holes 76 is doubled with respect to the number of holding holes 33, the number is not limited to this and may be the same number.

In the above-mentioned embodiment, the ejection member is the ball 35, but as long as the part ejected from the holding hole 33 is chamfered, it may have a rod shape, an elliptical shape, or the like. Moreover, the ejection member may be formed integrally with the holding member.

In addition, in the above-mentioned embodiment, in order to perform zero point adjustment, the clamp part 40 is configured to be rotatable with respect to the cylinder part 20. However, if the zero point adjustment is not required or other structures can be used for zero point adjustment, the clamp part 40 becomes the cylinder part 20. It doesn't matter if it cannot be rotated or formed as a whole.

In addition, in the above embodiment, the torque gradient adjustment means 70 uses the torque gradient adjustment screw 71 to move the torque gradient adjustment pin 73 in the axial direction. However, the torque gradient adjustment pin 73 may be formed in the shape of a bolt. The degree of locking is used to adjust the depth of the torque gradient adjustment hole 76.

10‧‧‧Torque screwdriver 20‧‧‧Cylinder part 30‧‧‧Spindle 32‧‧‧Ball retaining bush (ball retaining member) 35‧‧‧Ball (pop-up member) 40‧‧‧Clamping part 50‧‧‧Torque Setting dial 60 ‧ ‧ Coil spring 70 ‧ ‧ Torque gradient adjustment means 71 ‧ ‧ Torque gradient adjustment screw (operating piece) 73 ‧ ‧ Torque gradient adjustment pin (adjustment member) 76 ‧ ‧ Torque gradient adjustment hole

Fig. 1 is a top view of a torque driver according to an embodiment of the present invention.　　 Figure 2 is a cross-sectional view of the torque driver taken along the line II-II of Figure 1 and viewed from the direction of the arrow.　　 Figure 3 is an end view of the torsion driver taken along the line III-III of Figure 2 and viewed from the direction of the arrow.　　 Fig. 4 is a view of the torque driver viewed from the base end side (in the direction of arrow IV in Fig. 2).　　 Fig. 5 is an end view of the torsion driver taken along the line V-V in Fig. 2 and viewed from the direction of the arrow.　　 Fig. 6 is an explanatory diagram showing the principle of torque gradient adjustment of the torque gradient adjustment means. Fig. 6(a) and Fig. 6(b) show the state where the penetration depth of the ball is different.　　 Figure 7 is a graph showing the relationship between the compression length of the coil spring and the locking torque.

10‧‧‧Torque screwdriver

20‧‧‧Tube

22‧‧‧Long hole

30‧‧‧Spindle

31‧‧‧Socket

32‧‧‧Ball retaining bush (ball retaining member)

33‧‧‧Ball retaining hole

35‧‧‧Ball (Ejection member)

37‧‧‧Spring Socket Bush

40‧‧‧Fixture Department

43‧‧‧Plate

42‧‧‧Concave

44‧‧‧Concave

46‧‧‧Fixed screw

48‧‧‧Fixed screw

50‧‧‧Torque setting dial

52‧‧‧Torque setting screw

53‧‧‧Fixed screw

55‧‧‧Sliding Parts

57‧‧‧Torque indicating protrusion

60‧‧‧Coil spring

70‧‧‧Torque gradient adjustment method

71‧‧‧Torque gradient adjustment screw (operating piece)

72‧‧‧Insert hole

73‧‧‧Torque gradient adjustment pin (adjustment member)

76‧‧‧Torque gradient adjustment hole

77‧‧‧Pressing plate

79‧‧‧Axle hole

Claims (5)

A torsion screwdriver has: a main shaft, which can be equipped with accessories at the front end; a barrel part, which holds the aforementioned main shaft freely rotatable; a coil spring, which springs the aforementioned main shaft toward the base end of the aforementioned barrel part; and a holding member formed on the aforementioned A holding member on the base end side of the main shaft that rotates together with the main shaft, having a holding hole for holding the base end of the coil spring and opening toward the base end; an eject member provided in the holding hole; and a base end member , Is provided at the base end of the aforementioned cylindrical portion, the torque driver is characterized by having a torque gradient adjustment means, the torque gradient adjustment means includes: a torque gradient adjustment hole, the opening is provided in the inner surface of the base end member and The position opposite to the rotational movement path of the ejection member, so that a part of the ejection member can invade; and the torque gradient adjustment member is fitted with the torque gradient adjustment hole to adjust the intrusion of the ejection member to the torque gradient adjustment The depth of the hole. The torque screwdriver according to claim 1, wherein the torque gradient adjustment means includes: a torque gradient adjustment recess, which is recessed on the proximal side of the proximal member and communicates with the torque gradient adjustment hole; and torque gradient adjustment The operating piece is embedded with the aforementioned torque gradient adjustment recess In combination, the torque gradient adjustment member can be adjusted in the direction along the main axis. By operating the torque gradient adjustment operation piece, the torque gradient adjustment member can be moved in the torque gradient adjustment hole, and the aforementioned torque gradient adjustment hole can be adjusted. The ejection member intrudes to the depth of the aforementioned torque gradient adjustment hole. The torque driver according to claim 1 or claim 2, wherein the holding holes are formed in plural in the holding member, and the torque gradient adjustment holes are formed in the same number or multiples as the holding holes. The torque driver according to claim 1 or claim 2, wherein the base end member can be adjusted in position with respect to the barrel in a direction along the main axis. The torsion driver according to claim 1 or claim 2, wherein the front end of the coil spring is held by a sliding member slidable with respect to the cylindrical portion.

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