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:
Aug. 09, 1977
Filed:
Jul. 29, 1976
Hideo Hara, Kawasaki, JA;
Kabushiki Kaisha Komatsu Seisakusho, Tokyo, JA;
Abstract
For automatically terminating the operation of the vibrator in a self-propelled roller compactor when the vehicle is at rest or travelling slowly, a variable displacement pump driving the hydraulic motor of the vibrator is provided with a servo control mechanism including a spring-neutralized linear actuator capable of adjustably varying the per-cycle displacement of the pump by receiving hydraulic fluid pressure from another pump. Provided between the servo control mechanism and the said other pump is an on-off valve which is closed when the vehicle speed becomes less than a predetermined value, with the result that the actuator is neutralized to zero the displacement of the variable displacement pump. The on-off valve can be operated from an operator controlled shift lever, so as to be closed when the lever is in or adjacent a neutral position.