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:
Nov. 21, 1978
Filed:
Jun. 06, 1977
Charles R Clark, Mission Viejo, CA (US);
Richard J Clark, Redondo Beach, CA (US);
Gerald G Steele, Mission Viejo, CA (US);
Parker-Hannifin Corporation, Cleveland, OH (US);
Abstract
A device for opening a door on an airplane to expose a refueling receptacle having latches for connection to a fueling nozzle deployed from a tanker airplane so that the airplane may be refueled in flight. The device has a hydraulic actuator for opening and closing the door, first valve means for controlling the first actuator, a second valve means for controlling another hydraulic actuator that locks and releases the latches, a spring for opening the door when there is a failure in the supply of pressure fluid for the first actuator, and a means to prevent closing of the door before the latches are released from the nozzle.