E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/33
E21B 19/08 (2006.01) E21B 44/06 (2006.01)
Patent
CA 1237422
A B S T R A C T A method of adjusting the feed movement of a drill rod for drilling a rock by rotating the drill rod by means of a pressure medium operated rotary motor and by feeding the drill rod in a drilling direction and in the opposite direction by means of a pressure medium operated feed motor. A pressure change acting on the pressure side of the rotary motor due to a change in the rotation resistance of the rotary motor is caused to act on the outlet side in order to reverse the feed force of the feed motor in dependence of the pressure change. The pressures on the pressure side and the outlet side of the feed motor are controlled so that, when the pressure on one side increases because of the pressure change, the pressure on the other side decreases and vice versa. In a device for carrying out the method, the pressure medium circuit is provided with means which control the pressures on the pressure side and the outlet side of the feed motor so that, when the pressure on one side increases, the pressure on the other side decreases and vice versa.
456399
Hartiala Eero
Kuusento Jaakko
Paasonen Hannu
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Oy Tampella Ab
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