Electricity: circuit makers and breakers – Electric switch details – Contact
Patent
1993-07-19
1995-02-21
Luebke, Renee S.
Electricity: circuit makers and breakers
Electric switch details
Contact
200275, 200558, H01H 122
Patent
active
053918479
ABSTRACT:
In an electric switch, a movable contact element (6, 106) is linked to a first fixed contact (3, 103) by an end portion (14, 114) having a sharp-edge outline and housed in a seating having a rounded outline. The movable contact element (6, 106) has an interconnecting portion (9, 109) provided with a frusto-conical projection to be engaged in a coupling opening (18, 118) having rounded edges and formed in a second fixed contact (4, 114), so as to establish an electric continuity between the first and second fixed contacts when the movable contact element (6, 106) is brought to a closed condition. A first silver insert (16, 116) is joined on the interconnecting portion (9, 109), which insert has a larger volume than a second silver insert possibly joined on the edges of the coupling opening (18, 118). A protection cap (20, 120) arranged on the interconnecting portion (9, 109) receives the metal fragments projected from the contact area between said interconnecting portion and the second fixed contact (4, 104) following breaking and restoring of an electric continuity.
REFERENCES:
patent: 2606983 (1952-08-01), Rypinski
patent: 2761026 (1956-08-01), Youhouse
patent: 4524253 (1985-06-01), Sorenson
patent: 4737602 (1988-04-01), Yamamoto
patent: 4740661 (1988-04-01), Nishikawa et al.
patent: 4843200 (1989-06-01), Parlatore et al.
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