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:
Sep. 10, 1985
Filed:
Feb. 29, 1984
Robert T McKie, Boise, ID (US);
Other;
Abstract
A hydraulic drive system includes a pump and averaging accumulator for providing a source of substantially constant pressure hydraulic fluid for reciprocal movement of a piston within a cylinder to move a load such as a sawmill carriage attached to the piston, and a high pressure braking accumulator operable to receive and hold hydraulic fluid under a pressure higher than the pressure of the pump discharge and of the averaging accumulator to conserve energy during deceleration of the piston and load at each end of the piston stroke. The high pressure fluid stored in the braking accumulator during braking is employed to rapidly accelerate the piston and load at the beginning of each subsequent stroke, and a bypass circuit and relief valve may be provided between the accumulators to convey fluid to the averaging accumulator for further conservation of energy upon excessive build up of pressure in the braking accumulator.