Motor-driven hand-held percussion tool

Tool driving or impacting – Impacting devices – Hammer head driven by electric motor

Patent

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Details

173131, 173133, 173139, B25D 1700

Patent

active

044769415

ABSTRACT:
A hand-held motor-driven percussion tool comprises a piston driven over an air cushion and acting over an axially movable anvil on the inner end of a tool axially movable in a tool receiver provided at one end of a tool housing. The anvil has an annular collar located in the cavity of an impact body which is movable in the direction of the impact of the piston against a cushioning ring. The impact body has an abutment face adapted to be engaged by a collar of the anvil when the latter is driven by the piston. A face of the impact body facing away from the cushioning ring is directed toward a part fixedly connected with the tool housing. The mass of the impact body is for instance 10% greater than that of the anvil. If the tool during operation is withdrawn from a workpiece, then the flange of the anvil impinges upon the abutment face of the impact body and accelerates the latter towards the cushioning ring. The anvil reaches in a region adjacent the impinging location a rest position, so that the piston will not engage the anvil any longer, and further striking of the percussion tool will cease.

REFERENCES:
patent: 1591379 (1926-07-01), Hansen
patent: 3157070 (1964-11-01), Heidrich
patent: 3191694 (1965-06-01), Elliott et al.
patent: 3273469 (1966-09-01), Doyle
patent: 3797585 (1974-03-01), Ludvigson
patent: 3921729 (1975-11-01), Schmuck
patent: 4015671 (1977-04-01), Borison et al.
patent: 4029158 (1977-06-01), Gerrish
patent: 4239143 (1980-12-01), Johnson
patent: 4276941 (1981-07-01), Wanner

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