Impact motor with improved sealing of a drive piston

Details Impact motor with improved sealing of a drive piston Impact motor with improved sealing of a drive piston

1990-10-26

1992-01-28

Look, Edward K.

Expansible chamber devices

Piston

With spring means for biasing side wall portion radially

92172, 277165, 277198, 384 37, 173102, 173114, F16J 106, F16J 906, F16J 1500, F02F 500

Patent

active

050834991

ABSTRACT:
An impact motor comprises a housing (10) with a cylinder (11) therein, in which a reciprocating drive piston (40) via a gas cushion in a working chamber (44) of said cylinder (11) repeatedly drives a hammer piston (15) to impact on and to return from the neck (17) of a tool (20) carried by the machine housing (10). A piston groove (68) is provided adjacent to the front face (70) of the drive piston (40) and the peripheral part of said face (70) is rounded (71) towards said groove (68). A piston ring (41) is of steel having a temperature expansion coefficient substantially equal to the cylinder's (11) and is ground circumferentially to have a close sliding and sealing fit in the cylinder (11). The rounded (71) drive piston face (70) is adapted to the inner diameter of said ring (41) so as to permit the ring (41) to be forced into said groove (68) undeformed to ride on a elastically centering O-ring (69) of heat resistant rubber. The hammer piston (15) can alternatively have a similarly arranged steel or heat resistant plastics material piston ring (16) therearound or be machined to a sliding and sealing fit in the cylinder (11).

REFERENCES:
patent: 2369926 (1945-02-01), Thornhill et al.
patent: 2607644 (1952-08-01), Smith et al.
patent: 3046062 (1962-07-01), Wettstein
patent: 3269466 (1966-08-01), Mitchell
patent: 4749201 (1988-06-01), Hunger
patent: 4749202 (1988-06-01), Bonomi
patent: 4928577 (1990-05-01), Stoll

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