JP2001105351A - Impact tool - Google Patents

Abstract

(57) [Problem] An object of the present invention is to provide a striking tool excellent in operability that can reduce noise and vibration at the time of striking. SOLUTION: A vibration damping metal 7c is sandwiched on a second hammer 7 to attenuate a metal sound generated by the second hammer 7 as a sound source at the time of impact to reduce noise. Also, the second hammer 7 is supported by the cushioning material 6 while being slidable back and forth, and is insulated from the main body 1 by vibration, so that the vibration caused by the reflected wave from the tool bit 10 is transmitted to the main body 1 via the second hammer 7. Since the transmission is blocked, the vibration of the main body 1 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a striking tool for transmitting striking energy to a tip tool directly or through a meson by a striking element reciprocating in a cylinder.

[0002]

2. Description of the Related Art In a conventional impact tool, a striker reciprocates due to hydraulic pressure fluctuation and air pressure fluctuation caused by a compressor.
Alternatively, a striker that reciprocates due to air pressure fluctuations in an air chamber provided between the piston and the striker by a piston that reciprocates in a cylinder via an electric motor, an internal combustion engine, and a crankshaft driven by air pressure, and a striker involved in the strike And the meson has been made of a high-strength material excellent in impact resistance having a damping coefficient of less than 1%. In a striking tool that uses a meson to seal the lubricant, the meson is pivotally supported on the inner surface of the main body sleeve, and is slid within the main body sleeve within a certain stroke, and the tip tool is used as a work material. In this configuration, the meson hits forward when the meson is lifted from above, and the backlash of the meson after hitting the tip tool is buffered by a cushioning material.

[0003]

In the conventional impact tool, when the impact tool transmits the impact energy to the tip tool directly or by hitting the meson and when the tip tool rebounds from the work material, the impact tool or the impact tool re-appears. When colliding with a meson, there was a problem that a high-level metallic sound was emitted using a striker or a meson as a sound source. In a striking tool having a meson, the reflected wave when the tip tool hits the work material propagates to the meson and the longitudinal wave component is buffered by the buffer material, but the transverse wave component is passed through the main body sleeve. There was a problem that the vibration of the main body was caused and the worker was uncomfortable. SUMMARY OF THE INVENTION An object of the present invention is to improve the operability by damping the noise and vibration of the above-described impact tool.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to use a high-strength material in a tip tool collision portion of a meson and a striker and a collision portion of a striker and a meson, and to provide a damping coefficient of 1% in at least a part other than the collision portion. This is achieved by having a structure having the above-described damping metal, and attenuating a high-level metal sound using a striker or a meson as a sound source. In addition, the buffering of the main body vibration due to the transverse wave component of the reflected wave is supported by a buffer material that also serves as a seal for lubricating oil, in a state where the tip tool is pressed against the work material and the meson and the striker are at the striking position. This is achieved by adopting a configuration in which vibration is isolated from the main body.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A striking tool having a striking element or a meson as an impact member will be described below with reference to FIGS. A retainer sleeve 3, a hammer holder 4, and a hammer holder 5 are pivotally supported by a front cover 2 fixed to the impact tool body 1, and furthermore, a retainer sleeve 3, a hammer holder 4,
A second hammer 7 is pivotally supported by an O-ring 6 provided on the inner diameter of the hammer holder 5, and is slidable in the front-rear direction of the tool shaft. The second hammer 7 uses a high-strength material for the collision parts 7a and 7b with the tip tool 10 and the striker 8, and a damping metal 7c having a damping coefficient of 1% or more between the collision parts 7a and 7b.
Is sandwiched. The high-strength material and the damping metal are joined by pressing a boss provided on one joint surface into a concave hole provided on one joint surface or welding the joint surface. The second hammer 7, whose end face is hit by the hitting element 8 sliding in the cylinder 9, transmits the hitting energy to the tip tool 10 and then rebounds to the rear of the main body. The rebound of the second hammer 7 is received by the hammer holder 5, and the impact is buffered by a damper 12 supported by the hammer holder 5. On the other hand, at the moment when the tip tool 10 is separated from the work material,
The second hammer 7 protrudes forward, and the flange 7d of the second hammer abuts the inner diameter step 4a of the hammer holder. The impact at this time is buffered by the damper 11 supported by the hammer holder 4.

[0005]

According to the present invention, the metallic sound generated when the impactor strikes the second hammer to transmit the impact energy to the tip tool and when the tip tool rebounds from the work material and collides again with the second hammer. Can be reduced by the damping metal sandwiched between the second hammer and low noise can be achieved. In addition, the second hammer is pivotally supported in the sleeve via the cushioning material, and the vibration is insulated from the main body, so that the reflected wave when the tip tool hits the work material propagates to the second hammer and the transverse wave The transmission of the vibration of the second hammer due to the component to the main body can be buffered, and a hitting tool with lower vibration and excellent operability can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a striking position in a striking tool according to the present invention.

FIG. 2 is a vertical sectional side view showing a moment when a tip tool is separated from a work material in the impact tool according to the present invention.

FIG. 3 is an external view showing a meson according to the present invention.

[Explanation of symbols]

1 is a tool body, 2 is a front cover, 3 is a retainer sleeve, 4 is a hammer holder, 4a is a stepped portion of the inner diameter of the hammer holder, 5 is a hammer holder, 6 is an O-ring, 7 is a second hammer, and 7a is a tip of a second hammer. Collision part, 7
b is a collision portion of the second hammer with the striker, 7c is a damping metal portion of the second hammer, 7d is a collar portion of the second hammer, 8 is a striker, 9 is a cylinder, 10 is a tip tool, 11
Is a damper, and 12 is a damper.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shinki Otsu 1060 Takeda, Hitachinaka-shi, Ibaraki Prefecture Inside Hitachi Koki Co., Ltd. (72) Inventor Tsukasa Suzura 1060 Takeda, Hitachinaka-shi, Ibaraki Hitachi Koki Machinery ( 72) Inventor Junichi Uemura 1060 Takeda, Hitachinaka-shi, Ibaraki F-term in Hitachi Koki Co., Ltd. (reference) 2D058 AA11 CA03 DA15 DA33

Claims (5)

[Claims] 1. A striking tool having a collision member for applying a striking force to a tip tool, wherein the collision member is provided with a damping metal part. 2. The impact tool according to claim 1, wherein the impact member is a striker or a meson. 3. The impact tool according to claim 1, wherein both end portions of said impact member are formed of a high-strength material, and an intermediate portion is formed of said damping metal. 4. The impact tool according to claim 1, wherein the damping metal is made of a material having a damping coefficient of 1% or more. 5. The impact tool according to claim 1, wherein a buffer material is interposed between sleeves that support the impact member.