Impact mechanism for a hammer tool

Abstract

An impact mechanism 108 for an impact tool 100 having a housing 102 includes a piston 118 slidably disposed in the housing. A disk-shaped spacer 134 composed of a non-magnetic material is disposed at

Description

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Claims

1. An impact mechanism for an impact tool having a housing, the impact mechanism comprising:a piston slidably disposed in the housing;a disk-shaped spacer composed of a non-magnetic material, wherein the disk-shaped spacer is disposed at an end of the piston and is adapted to transfer an impact force to a tool bit; andfirst and second electromagnetic coils disposed between the piston and the housing, wherein the first and second electromagnetic coils are alternately activated to generate respective magnetic fields, wherein the piston moves towards the tool bit when the first electromagnetic coil is activated, and the piston moves away from the tool bit when the second electromagnetic coil is activated.

2. The impact mechanism of claim 1, further comprising a sleeve disposed between the piston and the first and second electromagnetic coils.

3. The impact mechanism of claim 2, wherein the sleeve is made from a nylon composite material.

4. The impact mechanism of claim 1, wherein the housing includes an opening adapted to receive the tool bit.

5. The impact mechanism of claim 1, wherein the housing includes a threaded portion adapted to threadably couple with a tool bit holding mechanism.

6. The impact mechanism of claim 1, wherein the non-magnetic material includes titanium.

7. The impact mechanism of claim 1, wherein the piston has a piston outside diameter in arange of about 21 mm to 34 mm, the housing has a housing outside diameter is in a range ofabout 68 mm to 72 mm, and the first and second electromagnetic coils each has an inside diameter in a range of about 27 mm to 37 mm.

8. The impact mechanism of claim 7, wherein the piston outside diameter is about 33.19 mm, the housing outside diameter is about 72 mm, and the first and second electromagnetic coils inside diameters are about 37 mm.

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