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US 3,993,120 AGranted
Space thermostat
AssigneeEmerson Electric Co.
InventorsWillard J. Iberg, Claude H. Keathley
Life of this patent
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AssigneeEmerson Electric Co.
InventorsWillard J. Iberg, Claude H. Keathley
Estimating the term…
A space thermostat for controlling the two-stage operation of both heating and cooling apparatus includes two single-pole, double-throw mercury type switches operatively connected to a single bimetallic coil. One switch energizes stage one of the heating apparatus when tilted in one direction and energizes stage two of the cooling apparatus when tilted in the other direction. The other switch energizes stage two of the heating apparatus when tilted more in the direction which effected the energizing of stage one of the heating apparatus and energizes stage one of the cooling apparatus when tilted less in the direction which effected the energizing of stage two of the cooling apparatus. The switches are adjustably mounted with respect to each other so that the differential between stages can be adjusted to be the same as the differential of each switch. With the differential between stages so adjusted, the energizing temperature of stage one of the heating apparatus and the energizing temperature of stage one of the cooling apparatus are automatically the same, a feature which simplifies the calibration of the thermostat. Printed circuit boards, attached to the switches, contain a portion of the internal wiring so as to reduce the amount of loose wiring.
In a space thermostat for controlling a two-stage heating apparatus and a two-stage cooling apparatus, a single thermally responsive sensing element, electrical switch means comprising two double-throw switches operatively connected to said sensing element, electrical connection means for selectively connecting said switch means to said heating apparatus and to said cooling apparatus, one of said switches effecting the energizing of said one of said two-stage heating apparatus when moved in one direction in response to a decrease in temperature sensed by said sensing element and effecting the energizing of stage two of said two-stage cooling apparatus when moved in an opposite direction in response to an increase in temperature, and the other of said switches effecting the energizing of stage two of said two-stage heating apparatus when moved further in said one direction in response to an additional predetermined decrease in temperature to a temperature below the energizing temperature of said stage one of said two-stage heating apparatus and effecting the energizing of stage one of said two-stage cooling apparatus when moved a lesser amount in said opposite direction in response to a predetermined increase in temperature to a temperature below the energizing temperature of said stage two of said two-stage cooling apparatus.
In a space thermostat for controlling a two-stage heating apparatus and a two-stage cooling apparatus, a base, a mounting shaft rotatably secured to said base, a single spirally wound bimetallic coil having its inner end secured to said shaft, a pair of switch mounting means secured in spaced relationship to the outer free end portion of said coil for movement therewith, a pair of single-pole, double-throw mercury switches attached to said switch mounting means, heating circuit connections including a system selector switch means in one position connecting said mercury switches to said heating apparatus, cooling circuit connections including said system selector switch means in another position connecting said mercury switches to said cooling apparatus, one of said mercury switches effecting the energizing of stage one of said two-stage heating apparatus when tilted in one direction to a first conductive position in response to a decrease in temperature sensed by said coil and effecting the energizing of stage two of said two-stage cooling apparatus when tilted in an opposite direction to a second conductive position in response to an increase in temperature, the other of said mercury switches effecting the energizing of stage two of said two-stage heating apparatus when tilted further in said one direction to a first conductive position in reponse to an additional predetermined decrease in temperature to a temperature below the energizing temperature of said stage one of said two-stage heating apparatus and effecting the energizing of stage one of said two-stage cooling apparatus when tilted a lesser amount in said opposite direction to a second conductive position in response to a predetermined increase in temperature to a temperature below the energizing temperature of said stage two of said two-stage cooling apparatus, and said switch mounting means including means for independently adjusting said mercury switches.
In a space thermostat for controlling a two-stage heating apparatus and a two-stage cooling apparatus, a single spirally wound bimetallic coil, switch mounting means secured to said coil for movement therewith, a pair of single-pole, double-throw mercury switches attached to said switch mounting means, said mercury switches each having a first conductive position to which they are successively tilted by said coil as it responds to decreasing temperatures and each having a second conductive position to which they are successively tilted as said coil responds oppositely to increasing temperatures, heating circuit connections including a selector switch means in one position connecting said mercury switches to said heating apparatus, cooling circuit connections including said selector switch means in another position connecting said mercury switches to said cooling apparatus, said switch mounting means including adjusting means for orienting said mercury switches with respect to each other so that a predetermined temperature differential is required to effect the successive tilting thereof to their said first conductive positions, and said predetermined temperature differential being the same as that required to effect the tiling of said mercury switches from their said first conductive positions and their said second conductive positions.
In a space thermostat for controlling heating and cooling apparatus wherein one apparatus is a single-stage apparatus and the other is a two-stage apparatus, a single thermally responsive sensing element, electrical switch means comprising a single-throw switch and a double-throw switch operatively connected to said sensing element, electrical connection means for selectively connecting said switches to said heating apparatus and to said cooling apparatus, said single-throw switch effecting the energizing of stage one of said two-stage apparatus when moved in one direction in response to a change in temperature sensed by said sensing element, and said double-throw switch effecting the energizing of stage two of said two-stage apparatus when moved further in said one direction in response to a further predetermined change in temperature in the same direction and effecting the energizing of said single-stage apparatus when moved in an opposite direction in response to an opposite change in temperature.
In a space thermostat for controlling heating and cooling apparatus wherein one apparatus is a single-stage apparatus and the other is a two-stage apparatus, a base, a mounting shaft rotatably secured to said base, a single spirally wound bimetallic coil having its inner end secured to said shaft, switch mounting means secured to the outer free end of said coil for movement therewith, a pair of mercury switches attached to said switch mounting means, one of said switches being single-throw and the other end of said switches being double-throw, electrical connection means for selectively connecting said switches to said heating apparatus and to said cooling apparatus, said single-throw switch effecting the energizing of stage one of said two-stage apparatus when tilted in one direction to a conductive position in response to a change in temperature sensed by said coil, said double-throw switch effecting the energizing of stage two of said two-stage apparatus when tilted further in said one direction to a first conductive position in response to an additional predetermined change in temperature in the same direction and effecting the energizing of said single-stage apparatus when tilted in an opposite direction to a second conductive position in response to an opposite change in temperature, and said switch mounting means including adjusting means for orientating said switches with respect to each other so that the temperature at which said single-throw switch is tilted to said conductive positions the same as the temperature at which said double-throw switch is tilted to said second conductive position.
In a space thermostat for controllng heating and cooling apparatus wherein at least one of the apparatus is a two-stage apparatus, a single thermally responsive sensing element, two electrical switches operatively connected to said sensing element, at least one of which is a double-throw switch, electrical connection means for selectively connecting said switches to said heating apparatus and to said cooling apparatus, one of said switches effecting the energizing of stage one of one of said apparatus when moved in one direction in response to a change in temperature sensed by said sensing element, and the other of said switches effecting the energizing of stage two of said one of said apparatus when moved further in said one direction in response to a further predetermined change in temperature in the same direction and effecting the energizing of at least one stage of the other of said apparatus when moved in an opposite direction in response to an opposite change in temperature.
Dependencies are inferred from the claim text.