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. 24, 1979
Filed:
Dec. 05, 1977
Akira Toyoda, Tokyo, JP;
Taisan Industrial Co., Ltd., , JP;
Abstract
An electromagnetic plunger pump capable of keeping its delivery pressure substantially constant when the value of a voltage applied thereto remains in the range of values within the tolerance limits of variations. In this pump, spring constants of a restoring spring and an auxiliary spring are selected and the positions of an electromagnetic coil, an electromagnetic plunger and an annular magnetic pole are fixed such that there exists a relationship 0.1<la/lb<1 between the distance lb between the magnetically neutral point of the electromagnetic coil and the magnetically neutral point of the electromagnetic plunger and the distance la between the upper end of the annular magnetic pole arranged below one end of the electromagnetic plunger and the lower end of the electromagnetic plunger. By this arrangement, it is possible to maintain the delivery pressure of the electromagnetic plunger pump in a stable range in spite of a variation in the value of the voltage applied thereto.