Hydraulically operated impact device

Details Hydraulically operated impact device Hydraulically operated impact device

1982-02-05

1985-01-22

Kazenske, E. R.

Tool driving or impacting

Impacting devices

With means to cause or control advance of hammer head

173131, 173112, 173139, 92 86, 92143, B23B 4516, F01B 3100

Patent

active

044946147

ABSTRACT:
In an hydraulic rock drill there is an hydraulic so called recoil damper that damps the reflected shock waves that propagates from the rock backwardly through the drill stem. The damper comprises a support piston (68) slidably in a cylinder so that a pressure chamber (20) is formed in which the support piston has a piston area. Narrow clearances (75,76) between the support (68) and its cylinder form leak passages and these leak passages are coupled in series with an orifice restrictor (84) to sump. The pressure peaks in the pressure chamber do not reach sealing rings located at the outer portions of the clearances.

REFERENCES:
patent: 2965074 (1960-12-01), Williamson
patent: 4006666 (1977-02-01), Murray
patent: 4068727 (1978-01-01), Andersson et al.
patent: 4073350 (1978-02-01), Eklof et al.

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