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:
Feb. 06, 1990
Filed:
Apr. 07, 1988
Izumi Ochiai, Tochigi, JP;
Masahiro Miyagi, Tochigi, JP;
Yoshio Nozawa, Tochigi, JP;
Yukio Kitayama, deceased, late of Oyama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A heat exchanger having different types of fins of different widths arranged such that different types of fins are arranged alternately can be efficiently produced by a process which has the steps of: forming a plurality of rows of refrigerant-tube holes in a hoop; forming lines of cutting which extend parallel to a direction of feed of the hoop at positions which are offset from the midpoint between adjacent rows of the holes, the lines of cutting having a length smaller than the longitudinal size of fins to be obtained; forming slits or elongated holes in positions of the hoop to which the ends of the lines of cutting is to be extended, the slits or elongated holes having longitudinal axes extending in the direction crossing the direction of feed of the hoop; cutting the hoop along a transverse line of cutting which extends in the direction crossing the direction of feed of the hoop past regions between adjacent slits or elongated holes which oppose to each other in the direction of feed of the hoop, thus severing a group of fins having a plurality of fins of different types connected integrally; stacking the succesively severed groups of fins; inserting refrigerant tubes into the holes in the fins and expanding the tubes so as to fix the tubes to the fins in the successive groups; and cutting the stacked successive groups of fins at positions between adjacent rows of the holes and within the regions of the slits or the elongated holes.