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:
Aug. 16, 1988
Filed:
Jun. 26, 1986
Applicant:
Inventors:
Takahiro Iwase, Anjo, JP;
Hiroyuki Mochizuki, Aichi, JP;
Shigenori Tamaki, Toyota, JP;
Nobuo Kobayashi, Toyota, JP;
Naofumi Masuda, Nagoya, JP;
Katsuro Harada, Tajimi, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04C / ; F04C / ; B23P / ; F16D / ;
U.S. Cl.
CPC ...
418152 ; 418178 ; 418206 ; 2915 / ; 29525 ; 403379 ;
Abstract
A Roots type pump comprising a pair of mating lobed rotors which are supported by rotor shafts, respectively. Each rotor is fixed to the corresponding rotor shaft by a pin forcibly inserted in a through hole provided through the rotor and rotor shaft. The outer surface of each rotor is surrounded by a coating layer of plastic material, at which the through hole has end openings having cross sectional dimensions greater than that of the substantial part of the through hole.