Hydraulically operated impact device

Details Hydraulically operated impact device Hydraulically operated impact device

F - Mech Eng,Light,Heat,Weapons

15

B

255/43, 138/40.1

F15B 21/00 (2006.01) B25D 9/12 (2006.01) B25D 9/14 (2006.01) B25D 17/24 (2006.01)

Patent

CA 1178513

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 tank. The pressure peaks in the pressure. chamber do not reach sealing rings located at the outer portions of the clearances.

395760

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