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:
Jul. 02, 1985
Filed:
Jun. 02, 1983
Manfred A Runkel, Valencia, CA (US);
William W Hsu, Burbank, CA (US);
Anthony E Singer, Newhall, CA (US);
William J Zlotski, Canyon County, CA (US);
HR Textron Inc., Valencia, CA (US);
Abstract
A hydraulic actuator including a piston rod having a centering mechanism associated therewith which, upon actuation, will return the piston rod to a predetermined position even against loads and lock it in that position and hold it there even without the presence of hydraulic power. The centering and locking mechanism includes a drive mechanism and cam surfaces on the piston rod which are engaged by drive surfaces on the driving mechanism. The drive and cam surfaces are opposed ramps with one of the ramps on the drive mechanism always disposed opposite one of the ramps on the actuator, such that at any position of the stroke of the actuator piston rod the centering and locking mechanism may be actuated and is operable to return the actuator to the predetermined position and lock it in place. The cam surfaces are infinitely variable as to their position on the piston rod within the limits of the dimensions of the drive mechanism.