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. 25, 2000
Filed:
Jun. 04, 1998
Nobuo Tojo, Mobara, JP;
Maruyama Mfg. Co., Inc., Tokyo, JP;
Abstract
A plunger pump comprising a plunger pump section (34) including a pumping chamber (60), a plunger (36) extending through the pumping chamber, a high pressure side-seal (58) and a low pressure side-seal (56) provided in slide contact with the plunger for preventing leakage of fluid from the pumping chamber, an annular and sealing through which a plunger (36) slidably extends into the pumping chamber (60), and an annular space (62) being defined between the high pressure side-seal (58) and the low pressure side-seal (56) so that it can receive liquid from a suction port (74) for lubrication of the plunger. Even when the plunger pump section (34) is installed at a predetermined or any circumferencial position, air is intended to be vented from the annular space (62). For this purpose, three circumferencially spaced channels (78) are formed in an inner wall of a manifold member (18) surrounding a sleeve (52) defining the pumping chamber (60) and communicate at their ends with the suction port (74) and (62).