Tool driving or impacting – Impacting devices – Hammer head constitutes piston of drive motor
Patent
1984-11-28
1987-03-24
Schran, Donald R.
Tool driving or impacting
Impacting devices
Hammer head constitutes piston of drive motor
173137, 173115, 91234, B25D 1706
Patent
active
046518339
ABSTRACT:
A pneumatic impact tool wherein a two-stage piston is reciprocable in the two-stage chamber of a cylinder. The tool which is to penetrate into a bone is mounted in the front portion of the cylinder and the piston strikes against such front portion in response to admission of compressed air against its rear end face. A relatively small annular shoulder of the piston faces forwardly and is continuously acted upon by compressed air. When the piston approaches or reaches the end of its forward stroke and rebounds from the front end portion of the cylinder, it seals the source of compressed air from its rear end face so that the action of compressed air upon the shoulder suffices to propel the piston rearwardly against the rear end portion of the cylinder at which time the piston reestablishes a path for the flow of compressed air against its rear end face so that it is propelled forwardly against the front end portion of the cylinder.
REFERENCES:
patent: 743389 (1903-11-01), Johnson
patent: 904725 (1908-11-01), Richards
patent: 1440082 (1922-12-01), Inslee
patent: 1703203 (1929-02-01), Officer
patent: 2536595 (1951-01-01), Dittmann
patent: 2725878 (1955-12-01), Reiter
patent: 3572448 (1971-03-01), Marcenuk
patent: 3655921 (1953-10-01), Haboush
patent: 4298074 (1981-11-01), Mattchen
Schenker Technik Das SK-Endopro-System fur eine ganz neue Art der Zementhosen Huftprothesen Operation.
Bobst Franz
Karpf Kurt
Emil Schenker AG
Kontler Peter K.
Schran Donald R.
Wolfe James L.
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