B - Operations – Transporting – 25 – D
Patent
B - Operations, Transporting
25
D
138/40.13
B25D 9/12 (2006.01)
Patent
CA 1109362
A B S T R A C T In a hydraulic percussive rock drilling machine of the differential piston area type, in which hydraulic fluid is constantly supplied to a return stroke chamber and fluid alternately supplied to and exhausted from a working stroke chamber, the dashpots for damping overtravel are provided in the working stroke chamber.
342337
Bereskin & Parr
Steel Engineering Company Limited (the)
LandOfFree
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