F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/74.1
F15B 11/00 (2006.01) E21B 15/04 (2006.01)
Patent
CA 1331126
Abstract An arrangement for operating hydraulic actuating means in a rock drilling machine, comprising pressure-con- trolled overcenter valves (7, 8) connected to conduits (5, 6) leading to chambers (3, 4) positioned on op- posite sides of a piston (2) of a cylinder (1) or the like actuating means, and non-return valves (11, 12) connected in parallel therewith. In order to operate the cylinder (1), one or two cartridge-type regu- lating valves (14, 15; 25) are mounted therein so as to be controlled by means of electric signals for dis- placing the piston (2) of the cylinder (1) in the de- sired direction. In the arrangement, a single pressure fluid supply hose (13) and a single pressure fluid return hose (9) are required for the operation of the cylinders (1) and other actuating means. (Figure 1)
605993
Piipponen Juha
Rajala Rauno
Cassan Maclean
Oy Tampella Ab
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