Pneumatic impact tool

Details Pneumatic impact tool Pneumatic impact tool

A - Human Necessities

61

B

121/15

A61B 17/16 (2006.01) B25D 9/20 (2006.01) B25D 9/26 (2006.01) A61B 17/00 (2006.01) A61B 17/92 (2006.01) B25D 9/00 (2006.01)

Patent

CA 1252676

PNEUMATIC IMPACT TOOL ABSTRACT OF THE DISCLOSURE 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.

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