Pneumatic hammer

Details Pneumatic hammer Pneumatic hammer

2005-05-12

2008-12-30

Rada, Rinaldi I. (Department: 3721)

Tool driving or impacting

Drive controlled by relative axial movement of tool

Drive motor controlled

C173S017000, C173S091000

Reexamination Certificate

active

07469751

ABSTRACT:
A pneumatic hammer comprises an elongate hollow casing with operatively upper and lower ends and has a piston slidingly received within the casing and operable to reciprocate within the casing between upper and lower pressure chambers defined within the casing. The hammer further has an axially displaceable bit assembly at the lower end of the casing and a backend assembly at the upper end of the casing. The piston has a striking face at an end thereof proximate the bit assembly, and the piston is operable to impact on a contact surface of the bit assembly in an impact region of the casing. The hammer is characterized in that the piston is shaped and dimensioned at its proximal end to have a snug sliding fit with an interior of the casing in the impact region of the casing.

REFERENCES:
patent: 4402370 (1983-09-01), Gein et al.
patent: 5562170 (1996-10-01), Wolfer et al.
patent: 5984021 (1999-11-01), Pascale
patent: 6050347 (2000-04-01), Jenne
patent: 6550554 (2003-04-01), Gien
patent: 2002/0011360 (2002-01-01), Gien
patent: 0 549 549 (1992-12-01), None
patent: 1 462 604 (2004-09-01), None
patent: 81/3065 (1981-05-01), None

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