Hydraulically operated impact device

Details Hydraulically operated impact device Hydraulically operated impact device

1984-11-05

1986-06-10

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

Patent

active

045937680

ABSTRACT:
In a hydraulic rock drill there is a 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 a 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), Anderson et al.
patent: 4073350 (1978-02-01), Elkof et al.
patent: 4494614 (1985-01-01), Eklof

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