JP2881689B2 - Impact tool for breaking work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable power hitting tool, and more particularly, to a breaking power hitting tool attached to a portable power impact excavator or the like.

[0002]

2. Description of the Related Art There are hitting tools, rotary tools, hit drilling tools and the like as portable hitting tools, which are used by being attached to a portable power impact drilling / digging apparatus. In particular, in the case of a rotary tool, an engaging groove for engaging with a torque transmitting ridge formed in a tool holder for transmitting torque from a counterpart (apparatus side) is formed in a longitudinal direction of the tool. It is.

For example, Japanese Patent Publication No. 3-4300 shown in FIG.
No. 3 relates to a tool holder 5 arranged on a driving member of a boring hammer, and a torque transmitting ridge 36 is formed on a connecting sleeve 6 of the tool holder 5. On the other hand, on the tool side, a groove 35 is formed in the longitudinal direction of the tool shaft portion 13 and the torque transmitting ridge 36 is fitted in the groove 35, so that the two members are integrated in the rotation direction. .

Further, Japanese Patent Application Laid-Open No. 2-50 / 1990 shown in FIGS.
No. 3533 relates to an apparatus in a hand-held machine tool for transmitting torque, but as shown most clearly in FIGS. 9A and 9B disclosed therein, the tool shaft 28 Grooves 29, 30, 31 in the axial direction
Is formed, and the counterpart tool receiving portion 3 corresponding thereto is formed.
2 torque transmitting ridges 34, 35, 36
0 and 31, and are integrated in the rotation direction in the same manner as in Japanese Patent Publication No. 3-43003.

In the conventional example shown in FIG. 5, the engagement between the groove 35 for transmitting the torque and the torque transmitting ridge 36 is performed at two places, whereas in the conventional example shown in FIG. Three locations (14, 15, 16), four locations (18, 19, 20, 21) in the conventional example of FIG. 7, and five locations (23, 24, 25, 26, 2) in the conventional example of FIG.
As described in 7), many fitting portions are provided to ensure transmission of torque.

[0006]

However, such a structure is effective when the tool is intended for rotary machining. However, such a structure can be used for breaking work, grooving, edging, consolidation, drilling, etc. It is not essential for a striking tool which only aims to apply an impact to the workpiece in the axial direction.
Rather, it requires excessive attention from the operator to correctly align the fitting direction when the tool is mounted on the holder. In addition, tools that correspond to the number of torque transmitting ridges of the tool holder, that is, tools that correspond to the type of tool holder, are required. is there.

[0007] The present invention solves the above problems by providing a tool that can be easily mounted on a tool holder and that can be used for various types of tool holders. It is intended to provide a hitting tool.

[0008]

In order to achieve the object of the present invention, a hammering tool for breaking work according to the present invention, as a means, is closed on both sides in the axial direction opposed diagonally and has a substantially cross section. A pair of semicircular notches are formed in the longitudinal direction to engage the spherical locking body, and a pair of grooves extending axially on both sides of the pair of notches and having an open end at the base of the tool are formed. The pair of grooves are formed symmetrically about the notch and are sized to accommodate all of the torque transmitting ridges formed on both sides of the locking body holding means of the tool holder which is the mating tool. The gist is to have.

[0009]

FIG. 1 is a perspective view of a hammering tool T for tearing-off work according to an embodiment of the present invention. The hammering tool T for crushing work has a tip called a bull point formed in a pyramid shape, and has a pair of bases which are diagonally opposed to each other and are closed on both axial sides and have a substantially semicircular cross section. A notch 1 is formed for engaging a spherical lock 2 described later.

As shown in FIGS. 1 and 2, a pair of grooves 3 having open ends extending in the axial direction on both sides of the pair of notches 1 are formed symmetrically about the notch 1. I have.

FIG. 3 is a cross-sectional view showing a state where the bull point T is mounted on a tool holder H on the other side (apparatus side). The tool holder H is entirely cylindrical and has a spherical locking body 2 in each of a pair of the semicircular notches 1 of the bull point T.
Are engaged and held by the tool holder H. As a result, the spherical locking body 2 is fitted slidably in the axial direction between the bull point T and the tool holder H, but since the notch 1 is closed on both sides in the axial direction, The bull point T does not separate from the tool holder H.

The inner peripheral surface of the tool holder H is formed with two torque transmission ridges 4 on one side of the pair of notches 1 and one on the other side. On the other hand, a pair of grooves 3 of the bull point T face the torque transmitting projections 4 of the tool holder H.

The pair of grooves 3 have the same shape and the same size,
The larger number of the torque transmitting ridges 4, that is, three torque transmitting ridges 4, have a relatively large dimension. Therefore, even if the bull point T is turned 180 degrees and mounted on the tool holder H, the three torque transmitting ridges 4
Are bulges T which are housed in opposing grooves 3 of the same shape and size, and torque transmitting convexes 4 formed in the tool holder H.
Mutual interference with is avoided. R is a tool receiving portion of the apparatus.

FIG. 4 is a cross-sectional view showing a fitting state when the counterpart tool holder H 'of the hitting tool for breaking work of the present invention has a different shape. As shown, on one side of the pair of notches 1 ′, three torque transmitting projections face the groove 3 of the bull point T, and on the other side, two torque transmitting projections 4 ′ face. I have.

As described above, since the pair of grooves 3 of the tool T is formed so as to accommodate the maximum number of torque transmitting projections that can be considered as a generally used tool holder, the number of the torque transmitting projections of the tool holder is reduced. Even if they are different, they do not interfere with the tool.

In any case, irrespective of the shape of the groove 3, all the torque transmitting projections 4 of the tool holder of the portable power impact excavator, which is generally used, have the dimensions of the groove 3 in the groove 3. What is necessary is just to store it when facing.

Although the embodiment of the impact tool according to the present invention has been described by using a bull point, the present invention is not limited to this. For example, cold chisels for grooving and squaring,
It may be an asphalt cutter for grooving, a rammer shank for consolidation, or a scoop.

【The invention's effect】

As described in detail above, in the portable power impact excavator to which the general-purpose impact tool of the present invention is mounted, the tool has a groove large enough to accommodate all the torque transmitting ridges of the tool holder. Are symmetrically formed, so that when the tool is mounted on the tool holder on the apparatus side, the tool can be fitted even if the tool is turned 180 degrees, so that the tool can be easily mounted on the tool holder. .

There are several types of actually used tool holders which have a certain rectangular shape, but are constant. As described above, the grooves of the tool only accommodate the torque transmitting convex shapes of all the tool holders facing each other. As long as the dimensions are sufficient, it can be used for various types of tool holders, and a highly versatile tool can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bull point which is an example of a breaking tool according to the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a side view showing a state in which the impact tool of FIG. 1 is mounted on a tool holder on an apparatus side.

FIG. 4 is a cross-sectional view of the state where the impact tool of FIG. 1 is mounted on a tool holder different from that of FIG. 3;

FIG. 5A is a cross-sectional view showing a state where a conventional tool and a tool holder are fitted to each other.

6A is a side sectional view showing an example of a conventional tool, and FIG. 6B is a transverse sectional view of the tool.

7A is a cross-sectional view showing another example of a conventional tool, and FIG. 7B is a cross-sectional view of the tool.

FIG. 8A is a side view showing still another example of a conventional tool, and FIG. 8B is a cross-sectional view of the tool.

9A is a cross-sectional view showing a conventional tool and a mating tool holder in a fitted state, and FIG. 9B is a longitudinal cross-sectional view thereof.

[Explanation of symbols]

 T Impact tool H Tool holder 1 Notch 2 Spherical lock 3 Groove 4 Torque transmitting ridge

Claims (1)

(57) [Claims] 1. A striking tool which is fitted and fitted to a tool holder of a portable power impact excavator, wherein a pair of notches which are diagonally opposed and are closed on both sides in the axial direction and have a substantially semicircular cross section are provided. A pair of notches are formed in the longitudinal direction to engage the spherical locking body, and a pair of grooves extending axially on both sides of the pair of notches and having an open end at the base of the tool are formed. A breaking operation characterized in that it is formed symmetrically with respect to the notch and has a dimension for accommodating all of the torque transmission ridges formed on both sides of the lock body holding means of the tool holder which is the counterpart. Impact tool.