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. 27, 1991
Filed:
Mar. 23, 1990
Applicant:
Inventor:
Hans Knopfel, Roggwil, CH;
Assignee:
Spuhl AG, St. Gallen, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21F / ; B23P / ;
U.S. Cl.
CPC ...
29 3 / ; 29 3 / ; 29 3 / ; 292835 ; 295661 ; 29788 ; 140 / ; 140 / ;
Abstract
A machine in which butterfly clips are prebent and then punched out of steel strip and simultaneously finally bent, such that they fasten together a spring and the frame of a spring core. Thus, both the punching out of the clip and the final bending process, i.e. the connecting process between the frame and spring parts, are carried out in a single tool. The machine therefore operates particularly cost-effectively, because, in comparison with the prior art, the separately punched butterfly clips do not have to be inserted into a separate bending machine.