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:
Mar. 30, 1999
Filed:
Oct. 27, 1997
Katsuaki Kaito, Nagaokakyo, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
In the inventive plunger pump, a plunger is pressed on a shaft by a spring via a thrust bearing having rolling elements clamped by a pair of bearing washers. By such a configuration, the motion of the shaft is immediately transmitted to the plunger, irrespective of whether the radius of the profile of a cam for driving the shaft back and forth is in the increment phase or decrement phase, so that the suction and discharge of liquid is performed without delay, since no play (or gap) exists in the transmission mechanism between the cam and the plunger. Thus, the fluctuation in the pressure is minimized during the operation of the pump and, when a low pressure gradient elusion is carried out, the solvents are supplied at the desired flow rates accurately.