Pneumatic rotary hammer device

Details Pneumatic rotary hammer device Pneumatic rotary hammer device

1977-01-19

1978-09-19

Staab, Lawrence J.

Tool driving or impacting

Impacting devices

With means for rotating tool

173 29, 173118, B25D 900

Patent

active

041146999

ABSTRACT:
A hammer drill has a motor-actuated drive piston and a free percussion body accommodated in a common, stationary cylinder. The percussion body is caused to move back and forth by the drive piston with air as the coupling and buffer medium. The hammer drill further has a tool holder driven by a hollow drive shaft which encloses the stationary cylinder and is driven by a motor which also actuates the drive piston.

REFERENCES:
patent: 3559751 (1971-02-01), Yamada
patent: 3766990 (1973-10-01), Eckman et al.
patent: 3828863 (1974-08-01), Bleicher et al.
patent: 3828865 (1974-08-01), Schnizler
patent: 3837409 (1974-09-01), Consoli et al.
patent: 3929195 (1975-12-01), Stiltz et al.

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