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:
Jul. 01, 1986
Filed:
Aug. 17, 1984
Applicant:
Inventors:
Yukio Kitayama, Oyama, JP;
Izumi Ochiai, Tochigi, JP;
Yoshio Nozawa, Tochigi, JP;
Masahiro Miyagi, Tochigi, JP;
Tadaaki Ayabe, Ibaraki, JP;
Katsuharu Uehara, Tochigi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23P / ; B21D / ; B23Q / ;
U.S. Cl.
CPC ...
29727 ; 2915 / ; 2915 / ; 29464 ; 29559 ;
Abstract
Disclosed is a tube-enlarging press in which clamping units are provided for preventing the fins and tubes used in a heat exchanger, from being buckled. The clamping units are provided with a through-hole for permitting the passage therethrough of mandrels falling outside of the area of the fin when the mandrels are lowered during the tube enlarging process. Therefore, the arrangements and preparations for replacement of the mandrels can be omitted.