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. 24, 1976
Filed:
Oct. 30, 1974
Gabor Liptak, Wettingen, CH;
Roland Schuler, Wettingen, CH;
BBC Brown Boveri & Company Limited, Baden, CH;
Abstract
A rotary electrical machine is provided with a laminated stack of iron sheets in which slots are formed and winding conductors inserted therein, the entrances to the slots then being closed by insertion of slot keys along the slots. In order to maintain the winding conductors in each slot under compression and to apply a pressure against the slot keys, a row of ring-shaped disk springs in the form of a truncated cone and made from a glass fiber-reinforced synthetic resin is inserted in the slot between the slot key and the winding conductors prior to installation of the slot key. The diameter D of the truncated conical springs is made equal to the width of the slot and the central opening therein has a maximum diameter of 0.3 D.