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:
Feb. 07, 1977
Willard J Haak, Peoria, IL (US);
Howard A Marsden, Pekin, IL (US);
Orrin A Stemler, East Peoria, IL (US);
Caterpillar Tractor Co., Peoria, IL (US);
Abstract
In a vehicle including a stick cylinder movable to change the attitude of a stick relative to a boom, and an implement cylinder movable to change the inclination of an implement relative to the stick, hydraulic circuit means are provided for serially connecting the cylinders so that as the stick cylinder moves the stick in one direction, discharge of fluid from the stick cylinder is used to actuate the implement cylinder to maintain substantially the same attitude of the implement relative to the ground. A flow divider is interposed between the cylinders to provide the desired degree of actuation of the implement cylinder in response to actuation of the stick cylinder. A dual pressure-responsive bypass valve provides a relatively high pressure relief to the implement cylinder when the implement cylinder is operated independently of the stick cylinder and provides a relatively low discharge path for the implement cylinder when operated in series with the stick cylinder.