Pneumatic hammer

Details Pneumatic hammer Pneumatic hammer

1976-07-29

1978-01-10

Staab, Lawrence J.

Tool driving or impacting

Impacting devices

Impact transmitting anvil

279 193, B23B 534

Patent

active

040674002

ABSTRACT:
A pneumatic hammer is an impact tool to be used in the construction industry and in mechanical engineering for chipping metal, scaling welds and chipping castings. The pneumatic hammer comprises a housing accommodating a barrel axially movable relative thereto, and a hood which is axially biased by a spring. The barrel is adapted to receive a tool having a non-circular cross-section. The hood has a non-circular hole for passage of the tool. Intermediate members are disposed between the hood and the tool and are in contact with the tool and comprise bodies of revolution rotatably mounted in the hood. The intermediate members define the non-circular hole of the hood, the shape of the hole corresponding to the cross-sectional shape of the tool. With such construction, the sliding friction between the tool and the side wall of the hood is replaced by the rolling friction between the tool and the intermediate members thereby reducing vibrations and lowering heating of the tool.

REFERENCES:
patent: 1349641 (1920-08-01), Wathen
patent: 1575792 (1926-03-01), Prellwitz
patent: 1668829 (1928-05-01), Stevens
patent: 1784012 (1930-12-01), Jowett
patent: 3525531 (1970-08-01), Ekstrom et al.
patent: 3885634 (1975-05-01), Goppen et al.
patent: 3910590 (1975-10-01), Ekstrom

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