JPH059877U - Low noise chisel - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To obtain a chisel that reduces noise generation. [Structure] By mounting the rubber ring 4 on the chisel shaft 1, the vibration / noise energy is converted into heat energy by the rubber ring 4 and is absorbed and attenuated. [Effect] The noise of 5 to 10 dB (A) can be reduced only by mounting the rubber ring 4 on the chisel shaft 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chisel used for crushing concrete, asphalt, etc.

[0002]

[Prior Art]

 The chisel crushes concrete and the like with an axial impact force generated by a crusher using an engine, hydraulic pressure, air pressure and the like as a shock source, and is usually made of SK material, SCM material and the like.

[0003]

[Problems to be solved by the device]

 As described above, such a chisel only needs to transmit the impact force in the axial direction. However, due to the material or the load, the chisel shaft is oscillated in the lateral direction as shown in FIG. 4, which is 1 to 4 KHz. It causes metal noise and deteriorates the working environment.

An object of the present invention is to provide a chisel that reduces noise generation.

[0005]

[Means for Solving the Problems]

 The structure of the chisel according to the present invention is as follows.

A low noise chisel in which a rubber ring is attached near the center of the chisel shaft.

[0007]

[Action]

 The usage as a chisel is the same as the conventional example. Lateral vibration and noise energy generated by the impact force and load transmitted from the crusher to the chisel is converted into heat energy by the rubber ring, absorbed and attenuated. As a result, the noise is reduced by 5 to 10 dB (A) as compared with the conventional example.

[0008]

【Example】

 In FIG. 1, 1 is a chisel shaft, 2 is a tip, 3 is a mounting portion, and 4 is a chisel shaft 1. A bellows-shaped rubber ring is mounted 15 cm from the tip, and this rubber ring 4 is impacted. It is stopped by a stopper 1a so as not to move. The rubber ring 4 has a hole having a diameter slightly smaller than that of the chisel shaft 1, and has a structure in which the hole 3 is attached to or detached from the mounting portion 3 of the chisel shaft 1.

FIG. 2 shows an embodiment in which three disc-shaped rubber rings are combined, and FIG. 3 shows an embodiment in which a rubber layer 5 is formed on the inside and a lead plate 6 is arranged on the outside.

When the rubber ring 4 is attached to the chisel shaft 1, the vibration and noise energy in the lateral direction is converted into heat energy by the rubber ring 4 and is absorbed and attenuated.

[0011]

[Effect of the device]

 As described above, according to the present invention, by mounting the rubber ring on the chisel shaft, the metal noise of 5 to 10 dB (A) can be reduced as compared with the conventional example. As a result, the working environment can be improved and the problem of noise pollution can be improved.

Further, since the rubber ring is simply attached, the noise countermeasure cost is small, and the attachment is easy, which is convenient for replacement.

[Brief description of drawings]

FIG. 1 is a side view of a chisel equipped with a bellows-shaped rubber ring according to the present invention.

FIG. 2 is a side view of a chisel equipped with a disc-shaped rubber ring.

FIG. 3 is a side view of a chisel equipped with a rubber ring made of a combination of a rubber layer and a lead plate.

FIG. 4 is an explanatory diagram of a lateral vibration mode generated on a chisel shaft.

[Explanation of symbols]

 1 Chisel shaft 1a Stopper 2 Tip 3 Mounting part 4 Rubber ring 5 Rubber layer 6 Lead plate

Claims (1)

[Claims for utility model registration] [Claim 1] A low noise chisel formed by mounting a rubber ring near the center of the chisel shaft.