Hydraulically operated percussive machine and an accumulator the

Details Hydraulically operated percussive machine and an accumulator the Hydraulically operated percussive machine and an accumulator the

1985-05-16

1987-06-30

Schran, Donald R.

Tool driving or impacting

Impacting devices

With means to cause or control advance of hammer head

173134, 138 30, B25D 1700

Patent

active

046763236

ABSTRACT:
A hydraulic percussive machine, for example a jack hammer or a rock drill, has an accumulator with a flexible diaphram (35). A lift valve (40, 41, 42) closes the outlet of the accumulator if the flow exceeds the normal flow substantially and it traps a volume of oil between the diaphragm and the valve when it closes.

REFERENCES:
patent: 3251380 (1966-05-01), Mercier
patent: 3580290 (1971-05-01), Sugimura
patent: 4165788 (1979-08-01), Montabert
patent: 4386627 (1983-06-01), Lachaux

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