Interconnecting device between contacts in electric switches and

Electricity: circuit makers and breakers – Electric switch details – Contact

Patent

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Details

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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