Document Type and Number:
Japanese Patent JPS6142790
Kind Code:
Y2
Abstract:
A hydraulically powered impact device for rock drilling having an impact piston driven by a hydraulic drive unit and a shank rod adapted to be struck by the impact piston. A motor imparts a rotary motion to the shank rod by rotating a sleeve through a gear train. The sleeve is rotatably mounted around the shank rod. A chuck is splined to the shank rod and a dog clutch is provided between the sleeve and the chuck for engaging both. A fluid passage is formed for introducing lubricant fluid stored in a gear casing into a chamber accommodating the dog clutch. The fluid passages includes a valve which is held open as long as the cover is connected to the main casing.
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Application Number:
JP15405581U
Publication Date:
December 04, 1986
Filing Date:
October 19, 1981
Export Citation:
International Classes:
E21B1/00; B23B45/16; B25D9/12; B25D17/00; B25D17/26; E21B6/00; E21C37/24; (IPC1-7): B25D17/00