Electricity: circuit makers and breakers – Electric switch details – Contact
Patent
1975-03-19
1976-11-23
Hohauser, Herman J.
Electricity: circuit makers and breakers
Electric switch details
Contact
200 1A, H01H 128
Patent
active
039938832
ABSTRACT:
The present invention relates to a contact spring set comprising contact springs and a lifting card, attached at the outer ends of the contact springs between an upper return spring and a lower return spring. In order to achieve a playless fixing of the lifting card to at least one of the return springs, which allows for a simple fitting of the lifting card, the return spring is flat and provided with two pairs of tabs, which are bent in such a way that adjacent tabs point in opposite directions. The lifting card has a hole for the return spring which is constituted by two portions, substantially equal and displaced relative to a symmetry line through the center of the lifting card, which is perpendicular to the plane of the return spring. The contour of each hole portion has at least one straight side, these straight sides being parallel and having a distance corresponding to the thickness of the return spring and a combined overall length corresponding to the width of the return spring. The remainder of the contours allows the first pair of tabs to pass through freely but, when pushing the card further on, the return spring is forced to twist to allow the second pair of tabs to pass the hole. After completed passage of the tabs the spring flips back and locks in the hole with a tight fit.
REFERENCES:
patent: 3096422 (1963-07-01), Alexandersson et al.
patent: 3555228 (1971-01-01), Ohno
Hohauser Herman J.
Telefonaktiebolaget L M Ericsson
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