Electricity: circuit makers and breakers – Solid contact – Membrane type
Patent
1999-11-09
2000-11-07
Friedhofer, Michael
Electricity: circuit makers and breakers
Solid contact
Membrane type
200 5A, H01H 1370
Patent
active
061440035
ABSTRACT:
A switch storing chamber (8) of a membrane switch is communicated with the exterior and no water droplet enters the switch storing chamber (8). At least one upper gas permeable chamber (5c) (5d) is formed between an upper membrane sheet (2) and a spacer sheet (3) by surrounding a peripheral portion of this upper gas permeable chamber by adhesive material layers (9) (13), and at least one lower gas permeable chamber (5a) (5b) is formed between a lower membrane sheet (4) and the spacer sheet (3) by surrounding a peripheral portion of this lower gas permeable chamber by the adhesive material layers (9) (13). The upper gas permeable chamber (5c) (5d) and the lower gas permeable chamber (5a) (5b) partially overlap each other in a vertical direction and communicate with each other by a gas permeable hole (15) of the spacer sheet (3) bored in an overlapping position so that a gas permeable passage (5) vertically curved in a zigzag shape is formed. One side of the gas permeable passage (5) communicates with the exterior and the other side communicates with the switch storing chamber (8). The gas permeable passage (5) communicates the switch storing chamber (8) with the exterior and is vertically curved in a complicated zigzag shape through the spacer sheet (3) so that a water droplet entering from the exterior is interrupted.
REFERENCES:
patent: Re31332 (1983-08-01), Larson
patent: 4365130 (1982-12-01), Christensen
patent: 4415780 (1983-11-01), Daugherty et al.
patent: 4916262 (1990-04-01), Jungels-Butler et al.
patent: 4931601 (1990-06-01), Lavender
patent: 5969320 (1999-10-01), Leeper et al.
Friedhofer Michael
SMK Corporation
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