Electricity: power supply or regulation systems – External or operator controlled – Phase controlled switching using electronic tube or a three...
Patent
1983-08-22
1985-05-28
Beha, Jr., William H.
Electricity: power supply or regulation systems
External or operator controlled
Phase controlled switching using electronic tube or a three...
200156, 307140, 315194, 323905, 338172, H05B 3904
Patent
active
045203067
ABSTRACT:
A dimmer switch assembly consists of a conductive yoke which has two insulation housings connected thereto which carry respective subassemblies for the dimmer switch. The first insulation housing contains a rotatable push shaft. Shaft rotation rotates a resistor plate having a resistive pattern on its surface relative to fixed resistor contacts. A biasing spring biases the shaft to an outward position relative to the conductive yoke. A cavity in the first housing receives a main power semiconductor device of the dimmer switch. The power semiconductor device is thermally connected to the yoke through a thin electrically insulative tape and has an active, non-electrically isolated, heat sink. A biasing spring within the first housing presses the power semiconductor device toward mechanical engagement with the yoke. The first housing assembly is fastened to the yoke by conductive eyelets which are insulated from the power semiconductor by the first insulation housing. The second insulation housing is a switch housing which contains a rotatable indexing cam switch which rotates relative to two spring contacts disposed on opposite sides of the cam such that the rotation of the cam alternately connects and disconnects the contacts through a conductive spider on the cam. The cam is operated by depressing the main shaft relative to the yoke. Insulation keying structures automatically key the first and second housings relative to the yoke and to one another.
REFERENCES:
patent: 3058020 (1962-10-01), Balan
patent: 3749871 (1973-07-01), Stoll et al.
patent: 3935505 (1976-01-01), Spitari
patent: 3949347 (1976-04-01), Gilbreath
Beha Jr. William H.
Lutron Electronics Co. Inc.
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