Hydraulic percussion apparatus

Details Hydraulic percussion apparatus Hydraulic percussion apparatus

1980-06-23

1982-08-10

Conan, Alan

Motors: expansible chamber type

Cyclically operable

Distributor forms traversed movable portion of working...

91298, F01B 718

Patent

active

043432271

ABSTRACT:
A hydraulic percussion apparatus comprising a body, a cylinder in the body and a percussion piston reciprocating in the cylinder. A distributing valve moves in a valve housing. A valve for starting and stopping the percussion apparatus is provided. A hydraulic pump and hydraulic channels form a percussion circuit with a gas/liquid pressure accumulator. A distributing valve circuit and a free circulation circuit are provided for the pump which are parallelly coupled with the percussion circuit, which circuits are connected to the pump and to the start-and-stop valve which has positions for controlling pressure in the circuits. The start-and-stop valve has a middle position during which pressure in the percussion circuit rises up to a predetermined value while the distributing valve circuit remains closed independent of the pressure in the percussion circuit.

REFERENCES:
patent: 4028995 (1977-06-01), Salimi
patent: 4084486 (1978-04-01), Juvonen

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