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:
Mar. 13, 2018
Filed:
Mar. 29, 2016
Larry G. Keast, Houston, TX (US);
Larry G. Keast, Houston, TX (US);
Other;
Abstract
A dual control hydraulic circuit for a tilting power swivel having a main hydraulic pump providing an operational supply of hydraulic fluid causing a clockwise or counter clockwise rotation of the tilting power swivel. A hydraulic cylinder used to hydraulically power an angular change between a bail and a body, wherein a local control valve can enable extension and retraction of a rod of the hydraulic cylinder. An auxiliary hydraulic pump providing hydraulic fluid at a low pressure, a hydraulic reservoir fluidly connected to the main hydraulic pump and the auxiliary hydraulic pump, an engine connected to the main hydraulic pump, and a hydraulic fluid return line from a local control valve to the hydraulic reservoir used for dual control for operating the hydraulic cylinder to tilt the tilting power swivel and a remote control connected to the local control valve for controlling the local control valve.