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. 31, 1998
Filed:
Oct. 31, 1995
Masashi Suzuki, Tokyo, JP;
Okawa Screw Manufacturing Co., Ltd., Tokyo, JP;
Abstract
A coupling in which work for fixing an inner pipe is facilitated, and in which airtightness is maintained such that oil leaks do not occur. A fixing member is fixed to a through-hole formed in an interior portion of an outer pipe. The inner pipe is supported by the fixing member. When a press-fit portion of the fixing member is press-fit into the through-hole, due to a taper surface, an axial center of the inner pipe is aligned with a center of the through-hole, and the press-fit portion fits tightly to an inner peripheral wall of the through-hole while plastically deforming the inner peripheral wall. A portion of the inner peripheral wall of the through-hole, which portion is plastically deformed by the press-fit portion, enters into an annular groove. A seat surface portion abuts and fits tightly to a surface at a peripheral edge of the through-hole. Due to the fixing member, the through-hole is in a completely airtight state.