E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/35
E21B 15/04 (2006.01)
Patent
CA 1120916
ABSTRACT OF THE DISCLOSURE In a pivotally mounted rock drill boom and feed bar apparatus the boom and the feed bar positioner include angle sensors comprising cam actuated fluid pressure regulating valves. The pressure regulating valves are disposed in a control circuit which includes a pilot pressure fluid actuated control valve which senses an unbalanced pressure signal gener- ated by one of the sensors in response to pivotal movement of the boom. The control valve responds to the unbalanced pressure condition by valving pressure fluid to the feed bar positioner actuator to maintain the feed bar in a predetermined directional attitude. The angle sensor responsive to pivotal movement of the boom may be adjusted independent of movement of the boom to cause a change in the directional attitude of the feed bar as desired.
347582
Gowling Lafleur Henderson Llp
Reedrill Corp.
LandOfFree
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