Hydraulically operated impact device

Details Hydraulically operated impact device Hydraulically operated impact device

1981-02-13

1983-11-08

Schmidt, Frederick R.

Tool driving or impacting

Impacting devices

Impact transmitting anvil

91278, B25D 918

Patent

active

044136870

ABSTRACT:
In a hydraulic rock drill the valve (27) is controlled by two control lines (37, 42), each control line having a plurality of branches with ports (38-41 and 43-46) which open into the hydraulic cylinder of the rock drill.
A valving pin (48) is slidable in a bore that intersects all of the branches of both control lines. By axially displacing the pin, the operator can pre-select the stroke length by deactivating some of the control lines and thereby the impact energy per blow. The control lines are deactivated in a predetermined bound relationship to each other.

REFERENCES:
patent: 645582 (1900-03-01), Watson
patent: 909923 (1909-01-01), Mitchell
patent: 1946548 (1934-02-01), Shaff
patent: 2100541 (1937-11-01), Gartin
patent: 3552269 (1971-01-01), Arndt
patent: 3780621 (1973-12-01), Romell
patent: 4034817 (1977-07-01), Okada
patent: 4172411 (1979-10-01), Matsuda et al.
patent: 4349075 (1982-09-01), Henriksson

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