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. 19, 1985
Filed:
Jun. 07, 1982
Herman J Maurer, Burlington, IA (US);
Carl O Pedersen, Burlington, IA (US);
Barry C Nudd, Burlington, IA (US);
J. I. Case Company, Racine, WI (US);
Abstract
An improved hydraulic swing mechanism is disclosed for operation of the boom assembly of a backhoe or similar implement. The swing mechanism includes a pair of double-acting hydraulic motors pivotally interconnected between the backhoe frame and the backhoe boom assembly. A novel multi-position sequencing spool valve is disposed in fluid communication between the head ends of the hydraulic motors and a manually operated directional control valve which directs swinging movement of the boom assembly. A straight-forward valve control linkage operatively connects the sequencing spool valve with the boom assembly so that the spool valve is selectively operated as the boom assembly is pivoted through its arc of travel. An improved hydraulic cushioning circuit is provided in association with the sequencing spool valve, with the entire system providing improved operation of the boom assembly, with significant improvement in the hydraulic cushioning and torque characteristics of the system.