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:
Oct. 20, 1981
Filed:
Jun. 02, 1980
Toshio Kamimura, Gifu, JP;
Teijin Seiki Company, Limited, Osaka, JP;
Abstract
A hydraulic actuator comprises: a cylinder; a piston axially slidably received in the cylinder and having a hollow bore axially extending therein; at least a locking member radially movably retained in the piston; a ram axially slidably received in the hollow bore of the piston and having an inclined portion connecting a lower engaging portion and an upper engaging portion with a circumferential length longer than that of said lower engaging portion, said inclined portion being slidably engageable with the radially inner face of the locking member for radial movement thereof; a switch piston radially slidably mounted on the cylinder to have a radially inner face engageable with the radially outer face of the locking member; and detecting means for detecting the piston under conditions locked and unlocked with the cylinder by detecting radial movement of the locking member through the switch piston. One type of the actuators has a stepped portion which is formed on at least one of the inclined portion of the ram and the radially inner face of the locking member.