JP2001105338A - Wrench device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To re-thread ridges easily and quickly with a tap or dice incorporated in the wrench shaft of a wrench device when they strip while for example the wrench device is used to fasten screw members. SOLUTION: A wrench device R comprises a storage chamber C formed in a wrench shaft S so as to open onto the tip side thereof, a tap T or die D disposed in the wrench shaft S for movement between a retracted position where it lies in the storage chamber C and a deployed position where it projects from the tip end of the wrench shaft S, and locking means Lo for fixing the tap T or die D in the deployed position so that it can not turn relative to the wrench shaft S.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrench shaft having an engaging portion which can be relatively non-rotatably engaged with a screw member such as a bolt or a nut, and a wrench body for rotatably supporting the wrench shaft. The present invention relates to a wrench device provided with a driving means for driving a shaft to rotate.

[0002]

2. Description of the Related Art In a conventional impact wrench, electric wrench, or other wrench device (see, for example, Japanese Utility Model Publication No. 3-47828) used for tightening a screw member, a thread cutting blade such as a tap or a die is used as a wrench. What has the structure built in the main body or the wrench shaft is not yet known.

[0003]

In general, when a screw thread is broken while a screw member is being tightened using a wrench device, the screw thread is cut using a tapping tool such as a tap or a die. Need to play.

[0004] In such a case, conventionally, a wrench device dedicated to threading that can rotationally drive the tap or the die is used separately, or a wrench shaft of the wrench device for screwing is replaced with a tap or a die. However, in the former case, it is necessary to prepare both a wrench device dedicated for screw tightening and a wrench device dedicated for screw cutting, so that the cost is increased and handling and management are troublesome. In the latter, there is a problem that the work of replacing the wrench shaft and the tap or the die is troublesome and the work efficiency is low, and that the tap or the die for the replacement needs to be prepared and stored separately from the wrench device. .

The present invention has been proposed in view of such circumstances, and has as its object to provide a wrench device that can solve the above-mentioned conventional problems.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a wrench shaft having an engaging portion which can be engaged with a screw member so as to be relatively non-rotatable, and the wrench shaft being rotatable. In a wrench device including a wrench main body to support and a driving unit that rotationally drives the shaft,
The wrench shaft is attached to the wrench shaft so that it can be moved between a retracted position that fits into the storage chamber and an advanced position that extends from the wrench shaft tip, and a storage chamber that is formed in the wrench shaft and that opens to the tip side of the shaft. And a fixing means for fixing the tap or the die to the wrench shaft so as to be relatively non-rotatable at the advanced position.

[0007] According to this feature, when a screw thread is broken during a tightening operation on a screw member using a wrench device, a tap or a die built in a wrench shaft of the wrench device is moved to a retracted position. By moving and fixing to a further advanced position and rotating the tap or the die by the driving means of the wrench device, the screw thread regenerating operation can be performed easily and quickly, thereby improving the operation efficiency. Also, since the tap or die is usually stored in the wrench shaft in the retracted position,
The trouble of storage and management is eliminated, and it is not necessary to separately prepare a wrench device dedicated to screw cutting.

According to a second aspect of the present invention, in addition to the above-mentioned features of the first aspect of the present invention, the wrench shaft has an entrance through which a tap or a die is put in and out of the storage chamber, and a detachable plug that closes the entrance. And an open / close lid. According to this feature, taps or dies can be easily exchanged by opening the opening / closing lid, so that taps or dies of any size can be built in the wrench shaft according to the screw tightening target.

According to a third aspect of the present invention, in addition to the above feature of the second aspect of the present invention, a spring for constantly biasing the tap or the die toward the retracted position is housed in the storage chamber, and the opening / closing lid and At least one of the wrench shafts is formed with an engagement hole for communicating the inside and outside of the storage chamber, and a stopper piece slidably engaged with the engagement hole is provided on a tap or a die so as to protrude therefrom. Has a first stopper surface at a rear end engaged with the stopper piece so as to hold a tap or a die at a retracted position, and extends in a first axial direction of the wrench shaft.
A second hole, shorter than the first hole, extending in the axial direction of the wrench shaft having a hole and a second stopper surface at a rear end for engaging the stopper piece so as to hold the tap or the die in the advanced position. And an intermediate hole communicating between the front ends of the first and second holes. According to this feature, the stopper piece is simply selectively slid between the first hole and the second hole of the engagement hole against the resilience of the spring, so that the stopper in the wrench shaft can be moved. The tap or dice can be easily switched between the retreat position and the forward position with one touch. Moreover, not only the taps or dies but also the position switching operation mechanism can be provided on the wrench shaft side, and there is no need to remodel the wrench body side. Can be easily applied simply by exchanging.

According to a fourth aspect of the present invention, in addition to the features of the second aspect of the present invention, there is provided a push rod supported in the wrench main body behind the storage chamber so as to be movable back and forth, and a push rod and a tap. A connecting means for detachably connecting the rear end of the die with the rear end of the die in the storage chamber, and furthermore, a connecting means for connecting the axially relatively immovable and relatively rotatable, and an operating member for operating the push rod back and forth from outside, Locking means for locking the operating position of the operating member so that the tap or the die can be held at the forward position, and detent means for allowing the tap or the die to move back and forth in the storage chamber but preventing rotation, and The locking means is constituted by the rotation preventing means and the locking means. According to this feature, since the tap or dice position switching operation mechanism is mainly provided on the wrench main body side, the degree of freedom of the installation position of the operation member is correspondingly increased, and the structure on the wrench shaft side is simplified.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on one embodiment of the present invention illustrated in the accompanying drawings.

1 to 9 show a first embodiment of the present invention. FIG. 1 is a partially cutaway side view of a wrench device, and FIG. 2 is a plan view of a wrench shaft. FIG. 3 is a front view of the wrench shaft (an enlarged view taken in the direction of the arrow 3 in FIG. 1), FIG. 4 is a cross-sectional view taken along the line 4-4 in FIG. 2, and FIG. FIG. 6 is an enlarged sectional view taken along line 5 of FIG.
FIG. 7 is an enlarged sectional view taken along the line -6, FIG. 7 is a view corresponding to FIG. 4, showing a state where the tap is at a forward position, FIG. 8 is an exploded perspective view of a main part of a wrench shaft, and FIG. FIG. 10 is an enlarged sectional view taken along line 10-10 of FIG. 11 to 17 show a second embodiment of the present invention. FIG. 11 is a longitudinal sectional view of a main part of a wrench device, FIG. 12 is an enlarged sectional view taken along line 12-12 of FIG.
11 is an enlarged sectional view taken along line 13-13 of FIG. 11, FIG. 14 is an enlarged sectional view taken along line 14-14 of FIG. 11, and FIG.
16 is an enlarged sectional view taken along line 16-16 of FIG. 11, and FIG. 17 is an enlarged sectional view taken along line 17-17 of FIG.

First, the structure of the first embodiment will be described with reference to FIGS. The impact wrench R as a wrench device has a pistol shape similarly to a conventionally known impact wrench, and has a hexagonal socket as an engaging portion which can be engaged with screw members such as bolts and nuts (not shown) so as to be relatively non-rotatable. A wrench shaft S having a hole h, a wrench body H rotatably supporting the wrench shaft S via a plurality of bearings b, and an air motor M as driving means for rotating the shaft S are provided.

A grip portion Hg that can be gripped by a user is formed integrally with a lower portion of the wrench main body H. A front surface of the grip portion Hg is used to control the rotation of the air motor M (and thus the wrench shaft S) as needed. Is provided.

The wrench shaft S has a tap T for threading.
The tap T is protruded from the tip of the wrench shaft S as necessary, and can be driven to rotate by the air motor M together with the shaft S. Next, the mounting structure of the tap T will be specifically described.

At the front end of the wrench shaft S, a storage chamber C is opened at the tip of the shaft S through the socket hole h.
Is formed. The wrench shaft S is in a retracted position in which the tap T fits in the storage chamber C (see FIG. 4).
And a forward position (see FIG. 7) extending from the tip of the wrench shaft S.
A fixing means Lo is provided for fixing the tap T to the wrench shaft S at a forward position and a retracted position, respectively, so that the tap T cannot rotate relatively.

On the upper surface of the wrench shaft S, there are provided an entrance O for taking the tap T in and out of the storage chamber C, and an opening / closing lid 2 for closing the entrance O. The entrance O can pass through the tap T. It is formed in size. The opening / closing lid 2 is detachably fixed to the wrench shaft S by a suitable fixing tool (a screw bi in the illustrated example).

The tap T is formed by integrally forming a square base 3r at the rear end of a rod-shaped tap body 3f having a threading blade 3fa on the outer periphery.

A stopper piece 4 extending radially outward of the tap is mounted on the enlarged base 3r so as to be rotatable within a predetermined angle range. That is, an arc-shaped hole 3ra for rotatably accommodating the disc-shaped base 4a of the stopper piece 4 is formed in the rear surface of the enlarged base 3r, and the disc-shaped base 4 of the stopper piece 4 is formed.
A locking claw 4b extending radially outward from a extends upward through an opening 3rb formed in the upper wall of the enlarged base 3r. A screw lid n is screwed into the open end of the arc hole 3ra to prevent the stopper piece 4 from being removed.

The cross-sectional shape of the storage chamber C is substantially the same as the cross-sectional shape of the enlarged base portion 3r of the tap T, and is formed in a rectangular shape larger than the socket hole h. Therefore, in a state where the tap T is set in the storage room C, the tap T is engaged with the bulging base portion 3r and the peripheral wall of the storage room C.
The relative movement in the front-rear direction with respect to the wrench shaft S is allowed, but the relative rotation is restricted.

The means for preventing the rotation of the tap T comprising the peripheral wall of the storage chamber C and the enlarged base 3r and the axial positioning of the tap T comprising the spring Sp, the engagement hole 5 and the stopper piece 4 described below. The fixing means Lo is constituted by the means.

In the storage room C, a coil-shaped spring Sp is interposed in a compressed state between the front inner wall (that is, the boundary wall with the socket hole h) and the enlarged base 3r of the tap T. As a result, the resiliency constantly urges the tap T toward the retreat position.

At least one of the opening / closing lid 2 and the wrench shaft S (in the illustrated example, straddling both of them) is formed with an engagement hole 5 for communicating the inside and outside of the storage chamber C. The stopper piece 4 (that is, the locking claw portion 4b) is slidably engaged with the stopper piece 4. The engagement hole 5 has a first stopper surface 5as at the rear end for engaging with the stopper piece 4 so as to hold the tap T at the retracted position, and has a first linearly extending first linearly extending in the axial direction of the wrench shaft S. It is shorter than the first hole 5a, which extends in the axial direction of the wrench shaft S with a hole 5a and a second stopper surface 5bs at the rear end engaged with the stopper piece 4 so as to hold the tap T at the forward position. It has a second hole 5b and an intermediate hole 5c communicating between the front ends of the first and second holes 5a and 5b. The circumferential position of the engagement hole 5 is set in correspondence with the upper wall opening 3rb of the enlarged base 3r.

Next, the operation of the first embodiment will be described. When a tightening operation is performed on a screw member (not shown) using the wrench device R, the tap T is in the retracted position and is hidden in the storage room C in a good manner. At this time, the tap T which is urged rearward by the elastic force of the spring Sp is retracted by the stopper piece 4 being pressed against the first stopper surface 5as at the rear end of the first hole 5a of the engagement hole 5. Fixed in position.

When the screw member is tightened, the trigger 1 of the wrench device R is pulled and the wrench shaft S is rotated by the air motor M with the socket member h at the tip of the wrench shaft S fitted in the screw member. What is necessary is just to drive. During this time, since the tap T is located in the storage chamber C behind the socket hole h, it does not mechanically interfere with the screw member to be tightened.

If the screw thread is broken during the tightening of the screw member as described above, the tap T built into the wrench shaft S of the wrench device L
Is moved from the retreat position to the forward position and fixed.

In performing the moving operation, the stopper piece 4
(That is, the hook 4b) by hand or with a suitable tool,
It is sufficient to simply slide the first hole 5a of the engagement hole 5 from the first hole 5a through the intermediate hole 5c to the second hole 5b against the resilience of the spring Sp. Easy and quick to do. When the tap T reaches the forward position, the stopper piece 4 is pressed against the second stopper surface 5bs at the rear end of the second hole 5b of the engagement hole 5 by the resilient force of the spring Sp. The tap T is firmly held, and furthermore, the engagement between the rectangular base 3r of the tap T and the peripheral wall of the storage chamber C ensures that the tap T is prevented from rotating at the forward position.

Accordingly, in this state, the tap T is rotated integrally with the wrench shaft S by the air motor M of the wrench device R, thereby making it possible to easily and quickly regenerate the broken thread. Further, since the tap T is normally stored in the wrench shaft S in the retracted position, the labor for storage and management of the tap T is omitted, and there is no need to separately prepare a wrench device dedicated to threading. Is simple.

An entrance O formed in the wrench shaft S
By opening the opening / closing lid 2, the tap T can be easily replaced with the storage chamber C, and a tap T of an arbitrary size can be built in the wrench shaft in accordance with an object to be screwed.

FIGS. 9 and 10 show an example in which a die D is incorporated in the wrench shaft S instead of the tap T. FIG.

The die D has a screw cutting blade 3fa '.
Is formed integrally with a rear end of a cylindrical die body 3f 'having an inner periphery, and a stopper piece 4 extending radially outward of the die D is formed on the expanded base 3r. Are mounted so as to be rotatable within a predetermined angle range. The structure of the enlarged base 3r and the stopper piece 4 and the die D
Is attached to the wrench shaft S by the tap T described above.
Therefore, the description is omitted.

In the first embodiment, in particular,
The stopper piece 4 protruding from the tap T or the die D is connected to the spring Sp between the first hole 5a and the second hole 5b of the engaging hole 5 provided in at least one of the opening / closing lid 2 and the wrench shaft S.
The tap T or the die D in the wrench shaft S can be easily switched between the retracted position and the advanced position with a single touch by simply sliding against the resilience of the wrench shaft S, so that the handling operation is extremely easy. It is. Moreover, not only the tap T or the die D but also the position switching operation mechanism thereof can be collectively provided on the wrench shaft S side. Therefore, it is not necessary to remodel the wrench body H side specially. It can be applied to the device R without difficulty simply by replacing the wrench shaft S.

Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, the angular portion of the push rod L extending in the front-rear direction is slidably and non-rotatably forward and backward through the locking and guiding means G in the wrench body H behind the storage chamber C of the wrench shaft S. Supported. The round rod-shaped front end of the push rod L faces the storage chamber C, and a space between the front end of the push rod L and the rear end of the tap T or the die D in the storage chamber C. A connecting means J is provided that is detachably connected and is relatively immovable in the axial direction and relatively rotatable.

The connecting means J includes a disc-shaped first end of a connecting projection 20 protruding from the rear end face of the enlarged base 3r having a rectangular shape of a tap T or a die (in the illustrated example, a tap is illustrated).
It is composed of a flange 20a, a disc-shaped second flange La formed on the front end face of the push rod L, and a connector 21 for covering the upper half of both flanges 20a and La. The connecting member 21 is formed in a rectangular parallelepiped shape so as to engage with the peripheral wall of the storage chamber C having a rectangular cross section in a relatively non-rotatable manner, and the lower surface thereof receives the upper half portions of both flanges 20a and La in a relatively rotatable manner. A pair of front and rear second arc grooves 21f, 21r shallower than the arc groove 21a, which receive the first arc groove 21a and the upper half of the front end of the connecting projection 20 and the push rod L, respectively, are relatively rotatable. Is established.

Further, the enlarged base portion 3r in the form of a square of the tap T or the die serves to cooperate with the peripheral wall of the storage chamber C to prevent the tap T or the die from rotating, as in the first embodiment. The enormous base 3r and the peripheral wall of the storage room C constitute a rotation-stopping means of the present invention, and the rotation-stopping means and a locking mechanism L1 described later constitute a fixing means Lo of the present invention.

On the upper surface of the wrench shaft S, as in the first embodiment, an entrance O for taking in and out the tap T or the die into and out of the storage chamber C, and a detachable opening / closing lid 2 for closing the entrance O are provided. The entrance O is formed in such a size that the tap T or the dice can pass therethrough. In this embodiment, the engagement hole 5 is not formed.

As in the first embodiment, a coiled spring Sp that constantly resiliently biases the tap T or the die toward the retreat position is interposed in the storage chamber C in a compressed state.

An operating member 22 for operating the push rod L forward and backward from the outside is mounted on the upper wall of the wrench body H so as to be slidable forward and backward. A first gear 22g engraved on the lower surface of the operation member 22 and a second gear 22g engraved on the upper surface of the push rod L
An intermediate gear 23 rotatably supported on the wrench body H is interposed between the gear Lg and the operating member 2.
The forward / backward movement of No. 2 is converted into a backward / forward movement of the push rod L (therefore, the tap T or the dice).

On the upper wall portion of the wrench body H, the operating member 22 is moved backward (the push rod L is moved forward).
Is provided with a lock mechanism L1. In the illustrated example, the lock mechanism L1 is rotatably supported by the upper wall of the wrench main body H so as to be rotatable and engageable with the locking recess 22a of the operation member 22; And a lock spring 25 constantly biased in the direction of engagement with the lock spring.

An air motor M for rotating the wrench shaft S is disposed in the wrench body H at one side of the push rod L, and its motor shaft is interlocked with the wrench shaft S via a gear transmission mechanism 26. Be linked.

In the second embodiment, basically, the same operation as in the first embodiment is exhibited. That is, if the screw thread breaks down while tightening the screw member,
Tap T built into wrench shaft S of wrench device L
Alternatively, the die is moved from the retreat position to the forward position and fixed, but in the moving operation, the operating member 22 is gripped by hand and the tap T or the die is spring-loaded by sliding from the forward limit to the retract limit. It is moved from the retreat position to the forward position against the repulsive force of Sp, and the forward position is
The lock piece L of the lock mechanism L1 is fixed by being locked to the locking recess 22a of the operation member 22. Further, in the forward position, the rotation of the tap T or the die is reliably prevented by the engagement between the rectangular base 3r of the tap T or the die D and the peripheral wall of the storage chamber C.

According to the second embodiment, in particular, the mechanism for switching the position of the tap T or the die can be provided mainly on the wrench main body L side. Further, the structure on the wrench shaft S side can be simplified.

As described above, one embodiment of the present invention has been described. However, the present invention is not limited to the above embodiment, and various embodiments are possible within the scope of the present invention. For example, in the above embodiment, an impact wrench driven by high-pressure air was shown as a wrench device. However, in the present invention, the driving method is not limited, and for example, an electric wrench may be used.

In the first embodiment, the stopper piece 4 corresponds to the engaging hole 5 on the enlarged base 3r of the tap T or the die D, which is prevented from rotating with respect to the peripheral wall of the storage chamber C (that is, square). Although shown as being mounted so as to be rotatable in a predetermined angle range, in the present invention, the tap T or the die D
The stopper piece 4 is fixed to the enlarged base (for example, circular) which is not stopped against the peripheral wall of the storage chamber C, and the stopper piece 4 is engaged with the engagement hole 5 (first and second hole portions 5a and 5b). In some cases, the tap T or the die D may be prevented from rotating.

[0045]

As described above, according to the invention of each claim,
If a screw thread breaks down while performing a tightening operation on a screw member using a wrench device, an operation of moving a tap or a die built in a storage chamber of a wrench shaft of the wrench device from a retracted position to an advanced position. And fix it,
When the tap or the die is rotationally driven by the driving means of the wrench device, the screw thread regeneration operation can be performed easily and quickly, thereby greatly improving the operation efficiency. Moreover, since the taps or dies are usually stored in the wrench shaft at the retracted position, the time and labor for storage and management are eliminated, and there is no need to separately prepare a wrench device dedicated to threading, and handling is simplified. It is simple.

According to the second aspect of the present invention, by opening the opening / closing lid of the entrance formed in the wrench shaft, it is possible to easily replace the tap or the die with the storage chamber. Taps or dies of the following size can be built in the wrench shaft.

According to the third aspect of the present invention, the stopper piece protruding from the tap or the die is connected to the first hole and the second hole of the engagement holes provided in at least one of the opening / closing lid and the wrench shaft. The tap or dice in the wrench shaft can be easily switched between the retracted position and the advanced position with a single touch by simply sliding selectively against the spring force of the spring. Operation is very easy.
Moreover, not only the taps or dies but also the position switching operation mechanism can be collectively provided on the wrench shaft side, so that it is not necessary to remodel the wrench body side specially. Can be applied without difficulty simply by replacing the wrench shaft, and the versatility can be improved.

According to the fourth aspect of the present invention, since the tap or dice position switching operation mechanism can be provided mainly on the wrench main body side, the degree of freedom of the installation position of the operation member is accordingly increased, and the wrench is also improved. The structure of the shaft can be simplified as much as possible.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a first embodiment of a wrench device of the present invention.

FIG. 2 is a plan view of a wrench shaft (an enlarged view as viewed in the direction of arrow 2 in FIG. 1).

FIG. 3 is a front view of a wrench shaft (an enlarged view as viewed in the direction of arrow 3 in FIG. 1).

FIG. 4 is a sectional view taken along line 4-4 of FIG. 2;

FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG. 4;

FIG. 7 is a view corresponding to FIG. 4, showing a state where the tap is at a forward position.

FIG. 8 is an exploded perspective view of a wrench shaft.

FIG. 9 is a view corresponding to FIG. 4, showing an example in which a dice is installed instead of a tap.

FIG. 10 is an enlarged sectional view taken along line 10-10 of FIG. 9;

FIG. 11 is a longitudinal sectional view showing a main part of a wrench device according to a second embodiment of the present invention.

FIG. 12 is an enlarged sectional view taken along line 12-12 of FIG. 11;

FIG. 13 is an enlarged sectional view taken along line 13-13 of FIG. 11;

FIG. 14 is an enlarged sectional view taken along line 14-14 of FIG. 11;

FIG. 15 is an enlarged sectional view taken along line 15-15 of FIG. 11;

FIG. 16 is an enlarged sectional view taken along line 16-16 of FIG. 11;

FIG. 17 is an enlarged sectional view taken along line 17-17 of FIG. 11;

[Explanation of symbols]

 C: storage chamber D: die H: wrench body h: socket hole as an engagement part L: push rod L1: lock mechanism Lo: fixing means M: Air motor as driving means O: Doorway R: Wrench device S: Wrench shaft Sp: Spring T: Tap 2: Open / close lid 3r: ··· Enlarged base part as stopper means 4 ··· Stopper piece 5 ··· Engagement hole 5a ··· First hole 5as ··· First stopper surface 5b ··· Second hole 5bs ··· 2 Stopper surface 5c: Intermediate hole 22: Operating member

Claims (4)

[Claims] 1. A wrench shaft (S) having an engaging portion (h) that can be relatively non-rotatably engaged with a screw member, a wrench body (H) rotatably supporting the wrench shaft (S), A wrench device provided with a driving means (M) for rotationally driving the shaft (S), comprising: a storage chamber (C) formed on the wrench shaft (S) and opened to the tip end side of the shaft (S); A tap (T) or a die (D) attached to the wrench shaft (S) so that it can be moved between a retracted position that fits in the storage chamber (C) and an advanced position that protrudes from the wrench shaft (S) tip. And a fixing means (Lo) for fixing the tap (T) or the die (D) to the wrench shaft (S) in the advance position so as not to rotate relatively. 2. The wrench shaft (S) has an entrance (O) through which a tap (T) or a die (D) is inserted into and out of the storage chamber (C), and a detachable plug that closes the entrance (O). A wrench device according to claim 1, characterized in that a possible opening and closing lid (2) is provided. 3. A spring (S) for constantly biasing the tap (T) or the die (D) to the retracted position side is provided in the storage chamber (C).
p) is accommodated, and at least one of the opening / closing lid (2) and the wrench shaft (S) is formed with an engagement hole (5) for communicating the inside and outside of the storage chamber (C). A stopper piece (4) slidably engaged with the engaging hole (5) protrudes from the tap (T) or the die (D).
Has a first stopper surface (5as) at the rear end which engages with the stopper piece (4) so as to hold the tap (T) or the die (D) at the retracted position, and has an axis of the wrench shaft (S). A first hole (5a) extending in the direction and a second stopper surface (5bs) engaging with the stopper piece (4) so as to hold the tap (T) or the die (D) in the forward position at the rear end. A second hole (5b), which is shorter than the first hole (5a) and extends in the axial direction of the wrench shaft (S), communicates between the front ends of the first and second holes (5a, 5b). The wrench device according to claim 2, characterized in that the wrench device has an intermediate hole (5c). 4. A push rod (L) movably supported in the wrench body (H) at the rear of the storage chamber (C).
The push rod (L) and the rear end of the tap (T) or the die (D) are connected in the storage chamber (C) so as to be detachable, axially immovable and relatively rotatable. A connecting member (J), an operating member (22) for operating the push rod (L) forward and backward from outside, and an operating member (22) for holding the tap (T) or the die (D) at the forward position.
Locking means (L1) for locking the operating position of the tap, and detent means (3r) for allowing the tap (T) or the die (D) to move back and forth within the storage chamber (C) but for preventing rotation. The wrench device according to claim 1 or 2, wherein the fixing means (Lo) is constituted by the detent means (3r) and the locking means (L1).