Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1985-01-09
1987-09-22
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
340594, 340693, 337333, 337376, 337361, G08B 1700
Patent
active
046958290
ABSTRACT:
A device for indicating that a sensed temperature has reached a certain selected level and method of making the same are provided, the device comprising a housing carrying an electrical switch unit for operating an indicator to one condition thereof when the switch unit is closed and to another condition thereof when the switch unit is open. The switch unit comprises a first movable contact unit and a second movable contact unit which when in contact with each other close the switch unit and when out of contact with each other open the switch unit. The first contact unit is moved relative to the second contact unit in relation to the sensed temperature. A selector unit is rotatably carried by the housing for selecting the certain level and has a setting portion operatively interconnected to the second contact unit to position the same relative to the first contact unit in relation to the selected level. The selector unit and the setting portion thereof comprise a one-piece selector member having a peripheral cam surface engaging the second contact unit to position the second contact unit relative to the first contact unit as the cam surface is rotated by the rotation of the selector member selecting the certain level.
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patent: 4560972 (1985-12-01), Britt
Prior Known Device Which Can Have a Table Lamp Plugged into the Same.
Everett Charles J.
Ochsner Rolf H.
Hofsass Jeffery A.
Robertshaw Controls Company
Rowland James L.
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