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:
Apr. 20, 1976
Filed:
Nov. 08, 1974
John T Potter, Locust Valley, NY (US);
Potter Instrument Company, Inc., Plainview, NY (US);
Abstract
The hydraulic system for raising and lowering a heavy keel comprises a cylinder, a piston movable in the cylinder and connected to the keel, and an accumulator for supplying hydraulic fluid at a positive pressure below that necessary to raise the keel against the piston in a direction for raising the keel. A hand pump is provided for supplying hydraulic fluid at a pressure great enough to overcome the weight of the keel. A valve allows the hydraulic fluid to flow either to or from the cylinder. An enlarged flow line communicates the accumulator with the cylinder so that if an external force should cause the keel to raise suddenly, hydraulic fluid would flow rapidly beneath the piston. A gas is provided on the other end of the piston for providing a cushioning effect and restricting the speed at which the keel can be raised. A restricted flow valve is provided in the system for regulating the speed at which the keel can be lowered.