JPH0413108Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a buffer mechanism against the reaction of a striking tool such as an electric hammer or a hammer drill, which applies a striking force to a tip tool using a striker to process a workpiece.

The prior art will be explained with reference to FIG. The reaction when the tip tool 14 hits is propagated to the damper 9 via the intermediate member 7 and the damper washer 11, and is attenuated by the deflection of the damper 9. The damper 9 is generally made of polyurethane rubber. However, this structure has the disadvantage that the recoil energy is large, and when the vibration frequency is high, the damper 9 self-heats, and the heat generated when the meson 7 is struck causes it to melt.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, increase the tolerance of the damper, and make this type of tool compact.

The present invention focuses on the fact that the damper 9 melts due to the self-heating of the damper 9 and the heating of the meson 7, and the damper 9 is divided into parts and a heat sink 10 is sandwiched between them.
The damper 9 is placed in contact with the front cover 12 or the cylinder 5, which has a large heat dissipation area, and is isolated by the cylinder flange 15 so that the damper 9 does not come into contact with the intermediate 7, thereby preventing the damper 9 from melting.

The present invention will be explained below with reference to illustrated embodiments. The power of the electric motor is converted into linear reciprocating motion of the piston 4 by a crankshaft (not shown) and the connecting rod 2. The reciprocating motion of the piston 4 is transmitted to the striking element 6 by an air spring between the piston 4 and the striking element 6, and the striking element 6 strikes the intermediate element 7. Intermediate 7
directly hits the tip tool 14 that is in contact with the meson 7. The recoil applied to the meson 7 due to the impact is applied to the damper 9 via the damper washer 11, and the deflection of the damper 9 absorbs and attenuates the recoil energy. The damper 9 includes a cylinder collar 15, a cylinder end face 5, a front cover 12, and a damper washer 1.
The heat dissipation plate 10 is housed in a room configured with 1. The inner and outer circumferences of the heat sink 10 are in contact with the outer diameter of the cylinder collar 15 or the inner diameter of the front cover 12.

Therefore, the heat dissipation of the damper 9 is improved, so that the allowable distortion amount and allowable frequency of the damper 9 can be increased. As described above, according to the present invention, since the capacity of the damper 9 can be reduced, it is possible to make the impact tool smaller and lighter.

[Brief explanation of drawings]

Fig. 1 is a longitudinal side view of the hammer part of the electric hammer according to the present invention, Fig. 2 is an enlarged longitudinal side view of the main parts of Fig. 1, and Fig. 3 is an enlarged view of the conventional example corresponding to Fig. 2. FIG. In the figure, 4 is a piston, 5 is a cylinder, and 6 is a piston.
1 is a striking element, 7 is an intermediate element, 9 is a damper, 10 is a heat sink, 11 is a damper washer, and 14 is a tip tool.

Claims (1)

[Scope of utility model registration request] A striking tool driven by the reciprocating motion of a piston and air pressure strikes an intermediate element, and the intermediate element strikes the tip tool, and the reaction to the intermediate element is damped by a damper held between a front cover and a cylinder. A recoil buffer mechanism for a striking tool, wherein the damper is divided, a heat sink is sandwiched between the dampers, and the heat sink comes into contact with either the front cover or the cylinder.