Tree felling ram with safety check valve

Details Tree felling ram with safety check valve Tree felling ram with safety check valve

1977-08-18

1978-10-10

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Fluid pressure

Vehicle attached

137521, 137498, 144 34A, B66F 324, A01G 2308

Patent

active

041192982

ABSTRACT:
A cylinder housing has a passageway extending in from the exterior thereof for admitting and discharging fluid to a cylinder portion. A piston in the cylinder has return movement by means of a resilient retracter, and a check valve having protected support in the housing is arranged to close off fluid discharge from the cylinder under abnormal fluid pressure return conditions such as when the ram is in use and there is a failure in the fluid supply for the piston.

REFERENCES:
patent: 1528857 (1925-03-01), Strandberg et al.
patent: 1812577 (1931-06-01), Albertine
patent: 2864394 (1958-12-01), Hempel
patent: 2923317 (1960-02-01), McInerney
patent: 3228658 (1966-01-01), London
patent: 3313019 (1967-04-01), Fuselier

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