Tool driving or impacting – Impacting devices – With impact cushioning means
Patent
1999-03-04
2000-09-12
Smith, Scott A.
Tool driving or impacting
Impacting devices
With impact cushioning means
173 48, 173109, 173201, B25D 1104
Patent
active
06116352&
ABSTRACT:
A drilling and a percussion power tool and the tool holder, a housing, an air cushion percussion mechanism arranged in the housing and including a guiding tube, a piston reciprocating in the guiding tool, a striker reciprocating in the guiding tube, an air cushion chamber formed on the guiding tube between the striker and the piston, at least one control opening ventilating the air cushion chamber in an idling position of the percussion mechanism, a control part which in a percussion operation closes the at least one control opening for forming an air cushion in the air cushion chamber, and at least one additional opening formed in the guiding tube for ventilating of the air cushion chamber and arranged forwardly of the at least one control opening at a side of a tool so that in the percussion operation the at least one additional opening is covered by the striker.
REFERENCES:
patent: 3866692 (1975-02-01), Stelljes
patent: 3926266 (1975-12-01), Dorgnon
patent: 4349074 (1982-09-01), Ince
patent: 5111890 (1992-05-01), Ranger et al.
patent: 5379848 (1995-01-01), Rauser
patent: 5435397 (1995-07-01), Demuth
patent: 5456324 (1995-10-01), Takagi et al.
patent: 5775440 (1998-07-01), Shinma
patent: 5873418 (1999-02-01), Arakawa et al.
Frauhammer Karl
Mueller Frank
Strasser Andreas
Robert & Bosch GmbH
Smith Scott A.
Striker Michael J.
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