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:
Apr. 05, 1977
Filed:
Feb. 24, 1975
Noble G Barker, Pekin, IL (US);
John E Corwin, Portland, IN (US);
Jimmy D Myers, Morton, IL (US);
Jan B Yates, Reynoldsburg, OH (US);
Caterpillar Tractor Co., , IL (US);
Abstract
An improved hydraulic actuator for use as a swing motor in a material handling apparatus of the type having a vehicle mounted boom. Two embodiments are disclosed and each includes a vertically disposed, double-acting cylinder having an internal, vertically reciprocal piston. The cylinder may be disposed between yoke arms mounting a boom and provision is made for securing the cylinder to the vehicle frame. A coupling device is secured to one of the yoke arms and has a first splined surface while means are carried by the piston and movable therewith and include a second splined surface slidably engaging the first splined surface. The piston also carries a third splined surface which is in engagement with a fourth splined surface carried by either the cylinder or a part of the vehicle frame and at least one of the splined surfaces has a helical pitch so that reciprocation of the piston will cause rotation of the coupling device to thereby effect rotation of the yoke to swing a boom attached thereto about a generally vertical axis.