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:
May. 30, 2017
Filed:
Aug. 27, 2014
Caterpillar Inc., Peoria, IL (US);
Peter Hsien Huang, Peoria, IL (US);
Michael Thomas Jackson, Hanna City, IL (US);
Ragavender Mailwar, Peoria, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A hydraulic winch assembly uses a control algorithm that separates brake control from drum rotation to permit fine control of load position. Actuation of an operator interface to a first position displacement threshold will release a drum brake but will not activate a hydraulic pump for operating a hydraulic motor coupled to the drum until the operator interface is moved to a second position displacement threshold. During the operating condition when the brake is released but the pump is not operating, the force of a load applied to a cable coupled to the drum may cause the cable to slowly unwind from and rotate the drum, thereby permitting fine control of drum rotation. Additionally, when the pump is activated upon further movement of the operator interface, a speed of the motor may be modulated, such as by a gear ratio command, to permit precise control over lower drum speeds.