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:
May. 15, 1984
Filed:
Jan. 25, 1982
Sachio Shimizu, Tokyo, JP;
Aiko Engineering Co. Ltd., Tokyo, JP;
Abstract
An extra-high pressure water pump includes a cylinder barrel, a piston and a pair of double check valves. The piston is composed of a main piston and a lubricating oil piston. The lubricating oil piston has a double piston ring and is slidably mounted on an additional piston rod connected to the main piston head. Lubricating oil is filled in a lubricating oil room made between the main piston and the lubricating oil piston in the cylinder barrel. The pressure between the lubricating oil and water in the pump is naturally kept at the same level by sliding a position of the lubricating oil piston on the additional piston rod, so that a sudden imbalanced pressure between the lubricating oil and the water in the cylinder barrel does not break the lubricating oil piston. The extra-high pressure water pump supplies extra-high pressured water to its small carriable water jet gun.