JP2002137176A - Tool holder device for impact tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operability and the assembling workability of a tool holder device for an impact tool. SOLUTION: A retainer sleeve 9 is provided with a hole 10 for holding a spherical body 5 fixed in the axial direction of the retainer sleeve 9, and provided with a slit 11 for holding the other spherical body 6 movable in the axial direction of the retainer sleeve 9. Movement of the spherical body 5 held inside of the hole 10 is regulated in the radial direction of the retainer sleeve 9, and the spherical body 5 can be projected from the retainer sleeve inner surface 9b. The spherical body 6 held inside the slit 11 is moved inside of the slit 11 in the axial direction of the retainer sleeve 9 for regulation of the moving position of a holder 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holding device for holding a tip tool of an impact tool such as a hammer and a hammer drill.

[0002]

2. Description of the Related Art A conventional tool holding device for an impact tool is provided with a spherical body for engaging a tool shank portion on a retainer sleeve, and by rotating a holder provided on the outer periphery of the retainer sleeve or moving the holder in the longitudinal direction of the tool axis. The engagement between the spherical body and the tool shank is controlled to hold and remove the tip tool.

[0003] There is also a one-touch mounting type which can be held by inserting a tip tool described in Japanese Patent Publication No. 3-43003 into a retainer sleeve.

[0004]

However, the above-mentioned conventional tool holding apparatus has a variety of different tool mounting methods, which is confusing to the user, has a certain operating load, and deteriorates operability. Even in the one-touch mounting type, there is a problem that the number of parts is large in the conventional device, the assembly is complicated, and the cost increases.

The present invention solves the above-mentioned conventional disadvantages,
An object of the present invention is to provide an inexpensive and easy-to-operate tool holding device.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a retainer sleeve with a hole for holding a spherical body immovably in the axial direction of the retainer sleeve and a long hole for holding another spherical body movably in the axial direction of the retainer sleeve. In addition, the spherical body held in the hole can be restricted from moving in the radial direction of the retainer sleeve by the holder and can protrude from the inner surface of the retainer sleeve, and the spherical body held in the elongated hole passes through the elongated hole in the axial direction of the retainer sleeve. This is achieved by a configuration in which the movement position of the holder is regulated by moving the holder.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a tool holding device for an impact tool according to the present invention will be described with reference to FIGS. Note that FIG.
FIG. 2 is an enlarged sectional view of a main part showing a state in which a tip tool is held,
2 is an enlarged sectional view of a main part showing one operation state when holding the tip tool, FIG. 3 is an enlarged sectional view of a main part showing one operation state when holding the tip tool, and FIG. 4 is a line AA in FIG. FIG. 5 is a sectional view taken along line BB of FIG. 2.

As shown in the figure, a retainer sleeve 9 is rotatably supported on the tool body 2, and the first steel ball 5 (spherical body) is moved on the retainer sleeve 9 in the axial direction of the tool bit 1. There is provided a hole 10 for holding the second steel ball 6 (spherical body) so as to be movable in the axial direction of the tool bit 1. Hole 10 and slot 1
1 indicates that the inner wall 10a of the hole 10 on the side of the meson 12 and the inner wall 11a of the elongated hole 11 on the side of the meson 12 are located at the same position in the axial direction of the retainer sleeve 9. Both the hole 10 and the slot 11 hold the steel balls 5 and 6 movably in the radial direction of the retainer sleeve 9.

A holder 7 and a grip 3 which are movable in the axial direction of the retainer sleeve 9 are provided on an outer periphery of the retainer sleeve 9, and a front cap 4 is provided at an end of the retainer sleeve 9. The holder 7 is shaped to cover the outer periphery of the retainer sleeve 9 and is constantly urged toward the front cap 4 by a spring 8. The grip 3 is in contact with the end of the holder 7 on the front cap 4 side,
By moving the grip 3 toward the meson 12, the holder 7 moves toward the meson 12 against the urging force of the spring 8 in conjunction with the movement of the grip 3. Note that the holder 7
A groove 7a is formed on the front cap 4 side so as to increase the inner diameter, and the end of the groove 7a on the side of the meson 12 communicates the groove 7a with the inner surface of the holder 7 so that the inner diameter gradually decreases. An inclined surface 7b is provided.

When the holder 7 is located closest to the front cap 4 by the urging force of the spring 8 as the urging means as shown in FIGS. The retained first steel ball 5 restricts the movement of the retainer sleeve 9 in the radial direction, and FIG.
As shown in (1), it does not protrude toward the outer periphery 9a of the retainer sleeve but protrudes toward the inner surface 9b of the retainer sleeve. Further, regarding the second steel ball 6 held in the elongated hole 11,
The second steel ball 6 protrudes into the groove 7 a provided in the holder 7, but has a dimension between the inner wall 11 b of the elongated hole 11 on the front cap 4 side and the inclined surface 7 b which is the end of the groove 7 a.
The second steel ball 6 does not enter the groove 7a but is set to be smaller than the diameter dimension of the long hole 11a.
Is in contact with the front cap 4 side inner wall 11b and the inclined surface 7b of the holder 7. As shown in FIGS. 4 and 5, the outer surface of the elongated hole 11 of the retainer sleeve 9 has a flat portion 1 located closer to the center of the tool axis than the outer periphery 9a of the retainer sleeve.
1c, the holder 7 is provided with a flat portion 7c that engages with the flat portion 11c, and the dimension between the flat portion 7c and the tool shank groove 1a of the tip tool 1 is the second steel ball 6c. 1 and 2, the second steel ball 6 in the elongated hole 11 is located between the plane portion 7c of the holder 7 and the tool shank groove 1a in the state shown in FIGS. Can not do. That is, the second steel ball 6 held in the elongated hole 11 is always located closer to the front cap 4 than the inclined surface 7 b of the holder 7, and the second steel ball 6 contacts the inclined surface 7 b in the elongated hole 11. By moving the retainer sleeve 9 in the axial direction in a state where the holder 7 is moved, it functions to regulate the moving position of the holder 7. Further, the holder 7 cannot rotate with respect to the retainer sleeve 9 due to the engagement between the flat portion 11 c of the retainer sleeve 9 and the flat portion 7 c of the holder 7.

When the grip 3 is moved toward the meson 12 against the urging force of the spring 8 from the state shown in FIG.
In conjunction with this, the holder 7 also moves toward the meson 12 and the tip tool 1 can be removed. That is, the movement of the first steel ball 5 in the hole 10 is released by the movement of the holder 7 toward the meson 12, and the first steel ball 5 can enter the groove 7 a of the holder 7. Thereby, the restriction on the axial movement of the tip tool 1 due to the engagement between the tool shank groove 1a and the first steel ball 5 is released, and the tip tool 1 can be removed. When the holder 7 moves toward the meson 12, the dimension between the inner wall 11 b of the elongated hole 11 on the front cap 4 side and the inclined surface 7 b is widened, so that the second steel ball 6 in the elongated hole 11 is also similar. Into the groove 7 a of the holder 7.

In the same manner as described above, the grip 3 is moved toward the meson 12 against the urging force of the spring 8, the tip tool 1 is inserted into the retainer sleeve 9, and then the grip 3 is moved toward the meson 12. Is released, the state shown in FIG. 1 is obtained, the holding of the tip tool 1 in the retainer sleeve 9,
That is, mounting can be performed.

Although the tool holding device of the present invention can attach and detach the tip tool 1 by operating the grip 3 as described above, the tip tool 1 can be placed in the retainer sleeve 9 without operating the grip 3. The tip tool 1 can be mounted only by mounting, that is, one-touch.

The operation of the tool holding device when the tip tool 1 is attached with one touch will be described below.

As shown in FIG. 2, when the tip tool 1 is inserted into the retainer sleeve 9, the end face 1b of the tip tool 1b projects toward the inner circumference 9b of the retainer sleeve.
When the holder 7 is further pushed in, the holder 7 moves toward the meson 12 while bending the spring 8 via the second steel ball 6 and the inclined surface 7b. When the second steel ball 6 collides with the inner wall surface 11a of the elongated hole 11 on the side of the meson 12, the second steel ball 6 moves radially outward of the retainer sleeve 9 along the slope of the end 1b of the tool bit 1, and the holder 7 protrudes into the groove 7a (FIG. 3). In addition, slot 11
Is provided at the same position in the axial direction of the retainer sleeve 9, so that the second steel ball 6 protrudes into the groove 7 a of the holder 7. At the same time, the first steel ball 5 in the hole 10 also moves along the end slope 1b of the tool bit 1,
The holder 7 moves outward in the radial direction of the retainer sleeve 9 and
Project into the groove 7a. As a result, the steel balls 5, 6 get over the end face 1b of the tip tool, the tip tool 1 is inserted until it hits the meson 12, the holder 7 is moved toward the front cap 4 by the urging force of the spring 8, and the second steel ball The part 6 moves toward the front cap 4 while the part protruding into the groove 7a abuts against the inclined surface 7b which is the end face of the groove 7a, and abuts on the inner wall surface 11b of the front cap 4 of the elongated hole 11, resulting in the state shown in FIG. . On the other hand, when the holder 7 moves toward the front cap 4 side, the first steel ball 5 moves radially inward of the retainer sleeve 9 along the inclined surface 7b and moves toward the retainer sleeve inner circumference 9b side, 1 tool shank groove 1
a, and the state shown in FIG. 1 is obtained.

As described above, the tip tool 1 can be mounted only by inserting the tip tool 1 into the retainer sleeve 9.

[0017]

According to the present invention, the retainer sleeve is provided with a hole for holding the spherical body immovably in the axial direction of the retainer sleeve and an elongated hole for holding another spherical body movably in the axial direction of the retainer sleeve. At the same time, the spherical body held in the hole protrudes from the inner surface of the retainer sleeve by being restricted from moving in the radial direction of the retainer sleeve by the holder, and can be engaged with the tool shank portion of the tip tool, and the spherical body held in the elongated hole The body moves inside the elongated hole in the axial direction of the retainer sleeve to regulate the moving position of the holder. By inserting the tip tool into the retainer sleeve, the tip tool can be mounted with one touch, and the number of parts can be reduced. It is possible to provide a tool holding device that is easy to assemble and has good operability without increasing the number of tools.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part showing an embodiment of a tip tool holding device for an impact tool of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing an operation state of the tool holding device of FIG. 1;

FIG. 3 is an enlarged sectional view of a main part showing one operation state of the tool holding device of FIG. 1;

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

FIG. 5 is a sectional view taken along line BB of FIG. 2;

[Explanation of symbols]

1 is a tip tool, 1a is a tip tool shank groove, 1b is a tip tool end, 2 is a tool body, 3 is a grip, 4 is a front cap, 5 and 6 are balls, 7 is a holder, 7a is a groove in the holder, 8 is a spring, 9 is a retainer sleeve, 10 is a hole of the retainer sleeve, 11 is a long hole of the retainer sleeve, 12
Is a meson.

Claims (3)

[Claims] An impact tool in which a striker follows a reciprocating motion of a piston and strikes a meson to crush a work material.
A retainer sleeve for accommodating a tool bit, a spherical body held in a hole provided in the retainer sleeve so as to be movable in a radial direction of the retainer sleeve, and an outer periphery of the retainer sleeve capable of being moved in an axial direction of the retainer sleeve. A holder that regulates the amount of movement of the spherical body by a moving position, and a biasing unit that constantly biases the holder in one direction, wherein the tip tool has a range longer than a sliding range of the meson. A tool holding device for slidably holding the sphere in the retainer sleeve, and a hole for holding the sphere so as to be immovable in the axial direction of the retainer sleeve and another sphere in the axial direction of the retainer sleeve. An elongated hole for movably holding the sphere is provided, and the spherical body held in the hole regulates movement of the retainer sleeve in the radial direction by the holder. The spherical body held in the elongate hole regulates the moving position of the holder by moving in the elongate hole in the axial direction of the retainer sleeve. Tool holding device for impact tools. 2. The holder is constantly urged in a direction away from the meson by the urging means, and the holder has a groove formed on the side opposite to the meson so as to have a larger inner diameter;
An inclined surface is provided at an end of the groove on the meson side so as to gradually decrease the inner diameter, and the spherical body held in the elongated hole when the holder is located closest to the meson. 2. A tool holding device for an impact tool according to claim 1, wherein the abutment contacts the inner wall of the elongated hole on the side opposite to the meson and the inclined surface and projects toward the inner surface of the retainer sleeve. 3. A tool holding device for an impact tool according to claim 1, wherein the inner wall on the meson side of the hole and the inner wall on the meson side of the elongated hole are located at the same position in the axial direction of the retainer sleeve. apparatus.