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:
Jun. 21, 1983
Filed:
Dec. 10, 1981
Carl O Pedersen, Burlington, IA (US);
Herman J Maurer, Burlington, IA (US);
J. I. Case Company, Racine, WI (US);
Abstract
An improved hydraulic system is disclosed for a backhoe having a rotating boom operated by a hydraulic swing mechanism. The system includes a hydraulic rotary sequencing valve which is operatively connected with the swing tower which supports the rotating boom. During rotation of the swing tower and boom by the hydraulic motors of the backhoe, the rotary valve is operated to selectively direct pressurized fluid to the motors for improved torque characteristics. A hydraulic cushioning circuit is provided in association with the rotary sequencing valve so that hydraulic cushioning of the motors, and thus the boom, is effected during the approach of the boom toward its travel stops, eliminating the need for conventional cushioning mechanisms in the motors themselves, and improving overall performance of the machine.