Document Type and Number:
Japanese Patent JPS5116881
Kind Code:
B1
Abstract:
The impacting device is primarily intended for rock drills and consists of a drive piston, a hammer piston and an auxiliary piston, wherein the drive piston drives the hammer piston by means of an elastic fluid cushion. The powertransmitting fluid cushion obtains a very high working pressure by being fed with elastic fluid under pressure and by being compressed by the drive piston during its working stroke. The auxiliary piston stops the hammer piston during its return stroke by absorbing the kinetic energy of the hammer piston. The hammer piston is stopped in a predetermined position corresponding to the optimum energy output before the succeeding stroke.
Application Number:
JP9758870A
Publication Date:
May 28, 1976
Filing Date:
November 07, 1970
Export Citation:
International Classes:
B25D9/12; B25D9/08; B25D17/06; E21B1/16; E21B1/30; (IPC1-7): E21C3/24; B25D9/08