JPS60259384A - impact tools - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (1) Field of Industrial Application This invention relates to an impact tool having a cutting edge with circumferential directionality, and an impact tool having a structure that allows skillful use of the directionality of the bit. It is.

(2) Conventional technology Impact tools that use chisel-shaped bits to chisel or form grooves in concrete have a flat tip, so they have circumferential direction. Directionality was used in the manipulated parts of impact tools, such as their handles and frames.

For this reason, the cutting edge of the bit is attached to the tool body in a way that is convenient for the machining process. I was operating it in a different direction.

However, operating parts such as handles are inherently safe and easy to work with, and for this reason, the mounting position of the handle can be changed to accommodate different working postures. There was also.

However, it is extremely difficult to change your working posture during work.
The handle installation position has to be changed each time.
Therefore, the work could not be done efficiently and it was not practical.

In addition, when a large force is generated in the circumferential direction on the cutting edge or is operated with a large force, even if the handle position is changed, the operation can be performed uniformly in each circumferential direction, including the relationship with the overall weight balance. It wasn't something.

(3) Problems to be Solved by the Invention The present invention solves these problems in an impact tool that uses a bit that has directionality in the circumferential direction, and can skillfully utilize the directionality of the bit, making it easy and safe to operate. The purpose is to obtain an impact tool that can work reliably.

Structure of the Invention (1) Embodiment The present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a longitudinal cross-sectional view of a main part of an impact tool according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the bit, and FIG. 3 is an external view showing the appearance of the impact tool.

In Fig. 1, the impact tool has a bit 1 attached to one end, and the tip 2 of the bit 1 is formed into a U-shape so as to form a groove in concrete, etc., and is oriented in the circumferential direction. .

A spring 4 is provided at one end of the power side 3, which is the main body side of the impact tool, to prevent the bit 1 from falling off.

Furthermore, a plurality of grooves 6 are disposed in the circumferential direction at the end 5, which is the rear end of the bit 1, and the end 5 is open toward the end 5.

In addition, keys 7 formed by balls are fitted into the grooves 6, and the grooves 6 are configured not to rotate via the keys 7, and the rotation of the bit 1 is restrained in the rotational direction by the power side 3. It is something that exists.

The bit 1 is provided with a collar 8, and is configured such that a spring 4 comes into contact with the collar 8, so that even if the bit 1 tries to come off the power side 3, this collar 8 hits the spring 4 and does not come off. It is configured. Further, the bit 1 is configured such that the end portion 5 is struck, and the striking is transmitted to the tip 2 of the bit 1 and is used to form grooves in concrete or the like or to remove sealing material filled in a bay. configured for use.

The bit 1 is configured so that the collar 8 hits the spring 4 and does not come off easily. However, if the bit 1 is strongly pulled toward the tip 2 against the bias of the spring 4, the spring 4
is extended so that the bit 1 can be pulled and moved toward the tip.

When the bit 1 is further strongly pulled toward the distal end, the groove 6 formed in the end 5 of the bit 1 is disengaged from the key 7 fixed to the power side 3, and is no longer restricted in the rotational direction.

Further, when the tension on the bit 1 is released, the bit 1 moves so that the key 7 and the groove 6 are fitted together by the urging force of the spring 4, and the bit 1 moves in the rotational direction at a position in the rotational direction where the groove 6 and the key 7 match. will be restricted to.

In FIG. 2, the end portion 5 of the bit 1 is provided with a groove 6 at a constant angle in the circumferential direction, and is configured to be fixed at every predetermined angle.

In FIG. 3, the impact tool has a bit 1 attached to one end, one handle 9 at the other end, and the other handle 10 at the center.

(2) Means for Solving the Problems In the present invention, the rotational direction of the bit 1 is restrained by a groove 6 in the bit 1 that is open toward the end 5; Taking advantage of this fact, the spring 4 urges the bit 1 so that the restraint by the groove 6 is not released, and the bit 1 is pulled against this urging to release the restraint. It is binding.

(3) Function With this configuration, by pulling the bit 1 against the spring 4, the mounting angle of the bit 1 can be easily changed.

Effects of the Invention According to the present invention, the bit can be arbitrarily fixed at a specific position in the rotational direction, so the bit can be pulled and rotated against the spring without changing the position of the power side handle. Since it can be operated easily, it is extremely convenient for work, and has the effect of enabling safe and reliable work.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of the main parts of an impact tool according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the bit part, and FIG. FIG. 1... Bit, 3... Power side, 4... Line 1
Nong, 6...groove, 7...key,
9, 10...non\n1niru. Patent applicant Shibaura Seisakusho Co., Ltd.

Claims (1)

[Claims] In an impact tool equipped with a bit having circumferential directionality at the cutting edge, a groove opened toward the end is provided in the circumferential direction at the rear end, and a key that fits into this groove is provided on the power side, A vjj hammer tool characterized in that the bit is biased toward the end side by a spring.