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. 05, 2002
Filed:
Apr. 20, 2000
James A. Krisher, Fort Wayne, IN (US);
Spicer Technology, Inc., Fort Wayne, IN (US);
Abstract
A novel arrangement of a hydraulic actuator assembly is disclosed. The hydraulic actuator assembly comprises a bi-directional electric motor driving a drive screw. A shaft coupler is threaded onto the drive screw. The shaft coupler is splined to a stationary coupler retainer to prevent rotational movement thereof. The shaft coupler is connected to a hydraulic piston slidably mounted within a pressure chamber by a compression spring. The spring functions both as a damper and as accumulator in a hydraulic system to help stabilize hydraulic pressure. An electrical control system for the hydraulic actuator comprises a high-pressure cutoff switch, a low-pressure cutoff switch, and a control switch. The control switch is adapted for activating the hydraulic actuator assembly and selecting desired operation mode.