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:
Oct. 18, 1983
Filed:
Jul. 15, 1981
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
In a hydraulic apparatus, an operating oil delivered from a fixed delivery hydraulic pump is divided into two parts, one of which is discharged into an oil tank by passing through a serial circuit consisting of a normally open valve and an orifice and the other of which is supplied to a piston-cylinder means by passing through a parallel circuit consisting of a normally closed valve and a check valve. When the normally closed valve is closed and the normally open valve is gradually closed, the piston is raised while gradually increasing in velocity. On the other hand, when the normally open valve is totally opened to stop the piston and the normally closed valve is gradually opened, the piston is lowered while gradually increasing in velocity. When the valves are operated to cause the piston to move vertically, the impact applied thereto at the time when the valve opening is large is largely mitigated by using said orifice.