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. 20, 1991
Filed:
Oct. 31, 1990
Kensaku Honma, Tokyo, JP;
Masahide Sakaguchi, Tokyo, JP;
Hidaka Seiki Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention relates to a tube expander having a reciprocating member for selectively reciprocating a plurality of mandrels for expanding tubes. Each mandrel includes a bullet, having a diameter which is larger than the inner diameter of the tubes, at the one end thereof. The tube expander of the present invention comprises an engage section formed at a head section of the mandrel, the diameter of the engage section is larger than the shaft section of the mandrel. A fixture is provided with the reciprocating member and having a through-hole through which the shaft section of the mandrel is inserted. A stopper is provided on the rear face of the fixture and being independently moved with respect to the head section of the mandrel by a drive means. The stopper prevents the mandrel from moving in the axial direction thereof with respect to the fixture during the movement of the stopper.