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:
Feb. 18, 1986
Filed:
Aug. 23, 1984
Hollis G Robison, Magnolia, TX (US);
Gray Tool Company, Houston, TX (US);
Abstract
An actuator for imparting a series of stepwise rotational movements to a valve shaft (2) or the like is provided. A bidirectional actuator, comprised of two opposing unidirectional actuators, includes a central drive wheel (6) secured to the shaft (2) and a pair of drive pistons (8, 10) axially reciprocable along the shaft (2). During reciprocation of the drive pistons (8, 10) protruding follower pins (30, 32) move within cam races (44, 46) disposed in the fixed housing (4). The cam races (44, 46) are so configured to allow the drive pistons (8, 10) to move into engagement with the drive wheel (6), before imparting a stepwise rotational movement thereto. During the return motion of the drive pistons (8, 10) the cam races (44, 46) are so configured to allow the pistons to disengage the drive wheel (6) before returning to their starting positions. A detent (54) for holding the drive wheel (6) and shaft (2) in any one of a preferred plurality of index positions is also disclosed.