The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 1981
Filed:
Apr. 30, 1979
James R Mayer, Englewood, CO (US);
Cooper Industries, Inc., Houston, TX (US);
Abstract
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 generated 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.