Japanese Patent JPS551438

B1

1380241 Percussive tools SKANSKA CEMENTGJUTERIET AB 9 Dec 1971 [11 Dec 1970 21 April 1971] 57320/71 Heading B4C [Also in Division G3] A system for automatically aligning at least one feed beam 4 of a rock drilling machine to a desired bearing and desired angle to the vertical to guide the movement of a rock drill unit 5 on the beam comprises a movable support unit 2, a jib 3 on the support unit, a feed beam 4 pivotally mounted on the jib for movement in two vertical planes by means of hydraulic mechanisms 7, 8 controlling tilt and turn respectively, the angles of tilt and turn γb, γv being measured by respective pendulum transducers 21, 20 providing signals to comparators 19, 18 respectively for comparison with desired values derived in operating circuits 16, 15 by combination of a signal from selector 17 and representing slope of the feed beam relative to the vertical with respective signals K 1 cos (α 0 + #) and K 1 sin (α 0 + #) obtained from resolver 11 where α 0 is the jib angle relative to the longitudinal axis of the support unit and # is the desired angular bearing of the feed beam relative to the longitudinal axis of the unit, the bearing angle being determined by means of a course indicator 9 including a compass and telescopic sight and a course follower connected to a resolver 10 whereby the bearing angle relative to magnetic north is determined, the output signals from the comparators acting on the hydraulic mechanisms to provide the desired alignment.

JP10059171A

January 14, 1980

December 11, 1971

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E21B3/00; E21B7/02; E21B15/04; (IPC1-7): E21C11/00

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