JP2001121435A - Wrench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wrench capable of effectively tightening and loosening screws in correspondence to operation conditions by selecting connection relations between a wrench head and a driving handle. SOLUTION: The wrench is composed of the wrench head 1 having, at the front end of the wrench, a driving shaft 3a for engagement of screws so as to convert the direction of rotation by a ratchet type rotary-direction conversion switch 10 and having a spline hole 2 at the base of a short arm 1a; and the driving handle 8 rotatably and frictionally attached, through a spline shaft arm 5, in an axial direction where a spline shaft 4 fitted into the spline hole 2 and a cylinder part 7 movably fitted into the spline hole 2 are coaxially and continuously provided. By press fitting the spline shaft 4 into the spline hole 2, the angle between the wrench head 1 and the driving handle 8 can be selectively fixed. By movably fitting the cylinder part 7 in the spline hole 2, the wrench head and the driving handle are rotatably coupled so as to operated by reciprocal movement of the driving handle, even in a narrow space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrench used for tightening and loosening screws such as bolts and nuts, and more particularly, to a work capability in which a connection relationship between a drive handle and a wrench head is changed according to a work situation. Related to the wrench to enhance.

[0002]

2. Description of the Related Art Conventionally, a manual wrench used for tightening and loosening screws such as bolts and nuts is a box for engaging screws or a box drive shaft having a rectangular cross section on a wrench head at the tip integrated with a drive handle. Is fixed, or
The wrench head has a ratchet type, and the rotation direction of the box or the box drive shaft is one-way, or the wrench head can be switched clockwise or counterclockwise by a changeover switch. As disclosed in Japanese Utility Model Registration No. 3038923, there is a type in which the angle of a drive handle can be changed in small increments with respect to a wrench head composed of a drive shaft and a connection body thereof.

[0003]

The wrench head which can change the angle of the wrench head relative to the drive handle as compared with the wrench head at the tip of the drive handle integrated with the handle corresponds to various work situations. By changing the angle between the wrench head and the drive handle, tightening and loosening of screws can be easily performed.However, although work can be performed in a narrow place, the drive handle There has been a problem that the number of rotations has to be increased in small increments and the working efficiency is not improved. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and enables a user to select a connection relationship between a wrench head and a drive handle, thereby facilitating tightening and loosening of screws in accordance with a work situation. In addition, an object of the present invention is to provide a wrench capable of performing work efficiently without having to turn the drive handle in small increments even in a narrow place.

[0004]

In order to achieve the above object, a wrench according to the present invention comprises a drive shaft portion for engaging a screw at a tip thereof.
Short arm with ratchet drive shaft 3 having 3a
1a, a coupling type wrench head having a splined hole 2 formed at the base thereof, that is, a coupling type wrench head 1, a coupling spline shaft 4 fitted and engaged in the spline hole 2, and a cylinder mating with the spline hole 2. Portion 7 is coaxially connected to the spline shaft 4 and the column portion 7.
And a drive handle 8 which is frictionally coupled to a tip end thereof so as to be rotatable by a predetermined angle in the axial direction. The wrench head 1 and the drive handle 8 are pushed and fitted into the spline hole 2 of the spline shaft 4. The angle between the wrench head 1 and the drive handle 8 can be freely rotated by allowing the spline hole 2 and the cylindrical portion 7 to loosen (the gap between the wrench head 1 and the drive handle 8). It is characterized by having become.

Accordingly, in the wrench of the present invention, the angle between the wrench head 1 and the drive handle 8 is selected and fixed to each other in accordance with various work situations, and the drive handle 8 is fixed to the spline axis direction. By rotating and using the screw, the screws can be easily and efficiently tightened or loosened. On the other hand, the cylindrical portion 7 of the drive handle 8 is loosely fitted to the spline hole 2 of the wrench head 1 so as to loosen the wrench head. By making the connection between the drive handle 1 and the drive handle 8 free to rotate, the drive handle 8 is reciprocated to rotate the wrench head 1 largely, not in small steps, even in a narrow place, thereby efficiently tightening or loosening the screws. It can be performed.

In this case, the spline shaft arm 5 is provided between the drive handle 8 and the spline shaft 4 and the cylindrical portion 7 which are continuously provided, with the spline shaft 4 and the cylindrical portion 7 which are continuously provided fixed to the ends. good. In this way, the spline shaft 4 and the cylindrical portion 7 which are continuously provided can be easily provided at the tip of the drive handle 8 so as to be freely rotatable on the processing surface, and the spline shaft 4 and the cylindrical portion 7 with respect to the spline hole 2 can be formed. Switching can be easily performed by the pressing operation in the axial direction.

It is effective to provide an elastic O-ring between the spline shaft 4 and the cylindrical portion 7 whose outer diameter is slightly larger than the inner diameter of the spline hole. Thus, when the cylindrical portion 7 is used for the spline hole 2, the spline hole 2 is prevented from engaging with the spline shaft 4, and the cylindrical portion 7 and the spline hole 2 can be stably fitted. The elasticity of the O-ring 6 allows the O-ring 6 to easily pass through the spline hole 2 at the time of switching between the play and the fitting.

It is desirable to use a ratchet type drive shaft 3 that can change the rotation direction of the drive shaft 3 by a rotation direction changing switch 10 as the ratchet type drive shaft 3 used for the wrench head. As a result, the drive shaft 3 of the wrench head is maintained while the drive direction of the drive handle 8 is maintained in a direction that allows easy operation.
The rotation direction of a can be easily switched between the clockwise direction and the counterclockwise direction, and the working efficiency can be increased.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view of the present invention, showing a state in which a wrench head 1 is mounted and fixed to a spline shaft 4 provided at a tip of a drive handle 8, and FIG. 2 is a spline provided at a tip of the wrench head 1 and a drive handle 8. It is the top view and side view which show the coupling state with the axis | shaft 4. FIG.

The wrench head 1 includes a ratchet mechanism (not shown) (Japanese Patent No. 29023, filed by the present applicant).
93 (disclosed in No. 93), the rotational direction changeover switch 10 on the upper surface of the main body 1 ′ having the counterclockwise or clockwise rotation changeover causes the ratchet type drive shaft body 3 to rotate when the changeover switch 10 is switched in the counterclockwise direction. The drive shaft 3a rotates clockwise with the clockwise rotation of the arm 1a, and the drive shaft 3a rotates with the counterclockwise rotation of the arm 1a when the conversion switch 10 is switched in the clockwise direction. To rotate counterclockwise. Main trunk
At the base of the short arm 1a following 1 ', a splined hole 2 is formed by cutting the gear (see FIG. 3). The spline shown in the figure has an insertion angle of 18 angles, and an angle of every 20 ° can be selected.
And an angle between a spline shaft arm 5 to be described later and a drive handle 8 following the arm, and the selection is made by pushing and fitting the coupling spline shaft 4 fixed to the spline shaft arm 5 into the spline hole 2. The angle can be fixed to each other.

The drive handle 8 has a predetermined length and a predetermined shape and is long. The handle tip is bifurcated into a U-shape.
Between the branched small arms 8a, 8a, a spline shaft arm 5 (see FIGS. 2 and 4) in which a coupling spline shaft 4 is implanted in a flat thick portion 5b at the end is connected to the flat thick portion 5b. The connecting portion 5a having a predetermined thickness perpendicular to the small arm 8a of the handle 8,
It is frictionally coupled rotatably by a shaft 8a ₁ is sandwiched between the strong friction state between 8a. [See FIG. 2 (A)]. The coupling spline shaft 4 is formed as a spline having a predetermined length of 20 ° step 18 on the shaft center thereof continuously with the head 4a, and the predetermined length of the spline shaft 4 is loosely engaged with the spline hole 2 through an O-ring groove. The cylindrical portion 7 is formed continuously, and is implanted and fixed to the flat thick portion 5b in a press-fitted state. An elastic O-ring 6 made of rubber is fitted in the O-ring groove, and its outer diameter is the spline hole 2.
When the spline shaft 4, which has a diameter slightly larger than the inner diameter and is fixed to the flat thick portion 5 b, is fitted into the spline hole 2 of the wrench head 1, the spline shaft 4 passes through the O-ring 6 to the outside. The column portion 7 is exposed, and a retaining screw 9 is screwed into the column portion 7 (see FIGS. 2A and 2B).

When the cylindrical portion 7 connected to the spline shaft 4 implanted and fixed to the spline shaft arm 5 is inserted into the spline hole 2 of the wrench head 1 and fitted together, the O-ring 6 is Since the outer diameter is slightly larger than the inner diameter of the spline hole 2, the spline hole 2 is prevented from engaging with the spline shaft 4, and the cylindrical portion 7 and the spline hole 2 can stably fit together. [See FIG. 2 (C)]. When switching between the spline hole 2 and the cylindrical portion 7 and the fitting between the spline hole 2 and the coupling spline shaft 4, the O-ring 6 is elastically deformed and can easily pass through the spline hole 2. .

Referring to FIG. 5, a spline shaft 4 implanted and fixed to the spline shaft arm 5 is pushed into and fitted into a spline hole 2 of the wrench head 1 so as to be sandwiched between the wrench head 1 and the tip of a drive handle 8. Spline shaft arm 5
And a state in which the angle formed with the drive handle 8 subsequent thereto is selectively connected. The angle is set according to the work scene, and the drive handle 8 efficiently tightens and tightens the screws.
Loosening work can be performed.

FIG. 6 shows an arm of the wrench head 1.
The spline shaft 4 is inserted into the spline hole 2 of 1a, and the spline shaft 4 is inserted into the spline shaft arm 5.
3 shows a state in which the drive handle 8 is rotated in the axial direction of the wrench head 1, that is, in the axial direction of the drive shaft 3 a of the wrench head 1. By rotating the screw correspondingly, the tightening and loosening of the screws can be performed efficiently.

Further, a wrench in which the drive handle 8 and the wrench head 1 are integrated in a place where the work site for tightening and loosening the screws is narrow and deep, or a drive handle 8 and a wrench head as described above. In the case where the wrench in which the angle between the wrench and the wrench is selected and fixed has to be rotated in small increments, as shown in FIG.
When the connection between the shaft and the spline shaft arm 5 is a rotation-free connection, the tightening and loosening of the screws can be easily and efficiently performed. The ratchet type driving body 3 in the main body 1 'at the tip of the wrench head 1 can change the turning direction of the driving shaft body 3 clockwise or counterclockwise by the turning direction changing switch 10 as described above. The connection between the spline hole 2 (see FIG. 3) at the base of the arm 1a of the wrench head 1 and the tip 5b of the spline shaft arm 5 is made at the lower part of the tip 5b as shown in FIG. Spline shaft 4
A cylindrical portion 7 continuously connected to the spline hole 2 via an O-ring 6 portion is loosely connected to the spline hole 2 and is prevented from coming off by a retaining screw 9 screwed into the cylindrical portion 7. The wrench head 1 and the spline shaft arm 5 are free to rotate.

In the above, the reciprocating operation of the drive handle 8 that is frictionally engaged between the base 5a of the spline shaft arm 5 and the small arms 8a, 8a branched at the handle tip causes the lower portion of the drive shaft body 3 of the wrench head 1 to move. When the turning direction changing switch 10 on the wrench head 1 is switched in the counterclockwise direction, the drive shaft portion 3a is rotated clockwise with the clockwise rotation of the arm 1a. Drive shaft with a square cross section
Reference numeral 3a turns an engaged box-type socket (not shown), which is a driven member, clockwise, and turns screws (bolts or nuts) engaged with the socket in a tightening direction. When the turning direction changing switch 10 is switched in the clockwise direction, the driving shaft portion 3a below the driving shaft body 3 rotates counterclockwise with the rotation of the arm 1a in the counterclockwise direction, and the driving shaft The portion 3a rotates the engaged box-type socket counterclockwise, and rotates the screws (bolts or nuts) engaged with the socket in the loosening direction. In this case, since the rotation angle of the drive shaft body 3 due to the reciprocating motion of the drive handle 8 can be made large (for example, 60 °),
If the wrench head 1 is rotatable and there is a narrow space enough for the drive handle 8 to reciprocate, the tightening or loosening of the screws can be performed efficiently without the necessity of operating the drive handle in small steps.

[0017] Figure 8 is intended to drive the shaft portion 3a of the drive shaft 3 ends the ratchet mechanism is incorporated in the main body 1 'of the wrench head 1 is formed in a box-type socket 3a ₁ of predetermined dimensions, driven A wrench head 1 having a box-shaped socket corresponding to the dimensions of the screws as a member is selected, and the spline shaft 4 or the cylindrical portion 7 on the tip side of the drive handle 8 is fitted or loosely fitted to the wrench head 1. Can be tightened and loosened.

In the above embodiment, the spline shaft 4 and the cylindrical portion 7 provided at the tip of the drive handle 8 are provided from the drive handle 8 via the spline shaft arm 5, but the spline shaft arm 5 is omitted and the spline shaft 5 is omitted. The spline shaft 4 and the cylindrical portion 7 can be rotatably and frictionally coupled to the tip of the drive handle 8 so that various changes can be made without departing from the gist of the present invention.

[0019]

According to the wrench of the first aspect of the present invention, the angle formed between the wrench head and the drive handle by pushing and fitting the spline shaft at the tip of the drive handle into the spline hole of the wrench head base. The drive handle can be arbitrarily rotated and tilted in the axial direction of the spline shaft together with the fixation, so that it can be used in various work situations by selecting and fixing the angle and using the drive handle in the spline axis direction. The screws can be easily and efficiently tightened and loosened while the cylindrical portion connected to the spline shaft on the drive handle side is loosely fitted to the spline hole in the base of the wrench head so that the wrench head and the drive handle By making the connection free to rotate, the drive handle is reciprocated to allow the wrench head to rotate not only in small steps but also in small places. Shimete can perform tightening or loosening of efficiently screws.

According to the second aspect of the present invention, the spline shaft arm is provided between the drive handle and the spline shaft and the cylindrical portion which are continuously provided, so that the spline shaft and the cylindrical portion which are continuously provided can be easily processed on the processing surface. In addition to being rotatable at the tip of the drive handle, the switching between the fitting of the spline shaft into the spline hole and the play of the cylindrical portion can be easily performed by the pressing operation in the axial direction.

According to the third aspect of the present invention, the O-ring provided between the spline shaft and the cylindrical portion prevents the spline hole from engaging with the spline shaft when the cylindrical portion is used as the spline hole. Thus, the driving handle can be reciprocated by stably fitting the cylindrical portion and the spline hole.

According to the fourth aspect of the present invention, by using the provided turning direction change switch, the turning direction of the drive shaft portion can be turned clockwise / counterclockwise while the driving handle is kept in the easy driving direction. The direction can be easily switched, and the working efficiency can be increased.

[Brief description of the drawings]

1A and 1B are side views of the present invention, in which FIG. 1A shows a state in which a wrench head is mounted on a spline shaft at the tip of a driving handle, and FIG. 1B shows a side view after mounting.

2 (A) is a plan view, and FIG. 2 (B) is a fitting state of a spline hole and a spline shaft. FIG. FIG. 2C shows the spline hole and the cylindrical portion in a loose state, respectively.

FIG. 3 is a plan view of a wrench head.

FIG. 4 is a bottom view of the spline shaft arm.

FIG. 5 is a bottom view showing a state in which an angle between a wrench head, a spline shaft arm, and a drive handle is selected and fixed;

FIG. 6 is a side view showing a state where the drive handle is rotated in the axial direction of the spline shaft.

FIG. 7 is a plan view when the drive handle is reciprocated while the connection between the wrench head and the spline shaft arm is free to rotate.

FIG. 8 is a partial cross-sectional side view of a wrench head when the drive shaft is a box-type socket.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wrench head, 1a ... Arm, 2 ... Spline hole, 3 ... Ratchet type drive shaft, 3a ... Drive shaft,
4 ... Spline shaft, 5 ... Spline shaft arm, 6 ...
Elastic O-ring, 7 ... cylindrical part, 8 ... drive handle,
10 ... Rotation direction change switch.

Claims (4)

[Claims] 1. A coupling type wrench head 1 having a ratchet type driving shaft body 3 having a driving shaft portion 3a for screw engagement at a front end thereof and having a spline hole 2 cut at the base of a short arm 1a. A coupling spline shaft 4 fitted / engaged with the spline hole 2 and a cylindrical portion 7 loosely engaged with the spline hole 2 are coaxially connected to each other, and the spline shaft 4 and the column portion 7 provided continuously are connected to each other. The drive handle 8 is frictionally coupled to the tip so as to be rotatable by a predetermined angle in the axial direction. The angle between the wrench head 1 and the drive handle 8 is selected by pushing and fitting the spline shaft 4 into the spline hole 2. So that the spline holes 2
A wrench characterized in that the wrench head 1 and the drive handle 8 are free to rotate by coupling between the wrench head 1 and the cylindrical portion 7. 2. A spline shaft arm 5 is provided between the spline shaft 4 and the column 7 and the drive handle 8 with the spline shaft 4 and the column 7 fixed to the ends. The wrench according to claim 1, wherein: 3. The wrench according to claim 1, wherein an elastic O-ring having an outer diameter slightly larger than the inner diameter of the spline hole is provided between the spline shaft and the cylindrical portion. 4. A ratchet drive type wherein the ratchet-type drive shaft body 3 is of a ratchet drive type in which the rotation direction of the drive shaft body 3 can be changed by a rotation direction changing switch 10.
Or the wrench according to 3.