Hydraulic percussive machines

Expansible chamber devices – With cushioning means effective over a portion only of stroke

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Details

91394, 173134, F01B 1102

Patent

active

041799836

ABSTRACT:
A hydraulic percussive machine in which a piston is caused to reciprocate in a cylinder including a cushioning flange on the piston, a first space in which the flange normally moves, a second space into which the flange can move on overtravel of the piston during the power stroke to trap fluid into the second space so that a dashpot action takes place, and co-operating timing grooves and ports on the piston and the cylinder to connect the first space to a low pressure zone in the system.

REFERENCES:
patent: 328730 (1885-10-01), Thoens
patent: 2248546 (1941-07-01), Morrison et al.
patent: 3596562 (1971-08-01), Foster et al.
patent: 3701386 (1972-10-01), Feucht
patent: 3774502 (1973-11-01), Arndt
patent: 3887019 (1975-06-01), Reynolds et al.
patent: 3990351 (1976-11-01), Sundin

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