Drilling and percussion hammer

Details Drilling and percussion hammer Drilling and percussion hammer

1986-01-14

1987-12-15

Bell, Paul A.

Tool driving or impacting

Impacting devices

With means for rotating tool

173109, 173122, 74 57, 74 22R, B23B 4516

Patent

active

047126256

ABSTRACT:
Drilling or percussion hammer with an electric drive motor driving, preferably directly and without the use of any countershaft, a sleeve-like enlarged portion of the drive shaft leading to the tool holding fixture, with the entire striking mechanism being arranged within the said enlarged portion. The striking mechanism comprises a reciprocating driving piston whose cylindrical outer wall is provided with a closed, cam-like guiding groove which is engaged by a guide cam, preferably a driving ball, provided on the sleeve portion of the drive shaft which is driven in the rotary sense. The driving piston, which is permitted to move axially, but retained against rotation, derives the translatory movement of the driving piston directly from the torque supplied by the driving electric motor to the tool holding fixture, the driving piston accommodating in its interior in the conventional manner a striking piston which preferably is cushioned by an air cushion and which acts upon an anvil.

REFERENCES:
patent: 2646100 (1953-07-01), Gibson
patent: 3006202 (1961-10-01), Moorhead
patent: 3331452 (1967-07-01), Wanner
patent: 3515016 (1970-06-01), Jemison
patent: 3995745 (1976-12-01), Chambers
patent: 4436163 (1984-03-01), Simpson

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