HVAC controller
View Patent ↗An HVAC controller may include an upper housing having a front and a back, the back including a center. A lens dial including an engagement portion may be rotatably secured relative to the upper housing. A set point operator may include a first portion that is disposed about the upper housing center as well as a second portion that is adapted to interact with the lens dial engagement portion. A mechanical movement to electrical signal converter such as a potentiometer may be disposed within the HVAC controller such that the first portion of the set point operator communicates with the potentiometer.
1. An HVAC controller comprising:
an upper housing, the upper housing having a front and a back, the back including a center;
a lens dial secured adjacent to the front of the upper housing, the lens dial being rotatable relative to the upper housing about a rotation axis, the lens dial having an engagement portion that is spaced laterally from the rotation axis of the lens dial, and extends through an opening in the upper housing toward the back of the upper housing, wherein when the lens dial is secured adjacent to the upper housing, at least part of the upper housing is situated between the rotation axis of the lens dial and the engagement portion;
a set point operator including a first portion that is rotatable about the rotation axis of the lens dial and a second portion that extends over toward and engages the engagement portion of the lens dial such that rotation of the lens dial results in movement of the engagement portion along an arc, causing the second portion of the set point operator to move along an arc and to rotate the first portion of the set point operator about the axis of rotation of the lens dial; and
a mechanical movement to electrical signal converter disposed within the HVAC controller such that the first portion of the set point operator communicates with the mechanical movement to electrical signal converter.
2. The HVAC controller of claim 1 , wherein the upper housing comprises one or more retention clips that rotatably secure the lens dial to the upper housing.
3. The HVAC controller of claim 2 , wherein one or more retention clips interact with a lens dial periphery.
4. The HVAC controller of claim 1 , wherein the first portion of the set point operator includes an annular portion adapted to fit about the upper housing center and a shaft portion adapted to interact with the mechanical movement to electrical signal converter.
5. The HVAC controller of claim 4 , wherein the upper housing center includes an annular ring about which the annular portion of the set point operator rotates.
6. The HVAC controller of claim 1 , wherein the lens dial includes a set point indicator disposed on the lens dial.
7. The HVAC controller of claim 6 , wherein the lens dial and the set point indicator are integrally molded.
8. The HVAC controller of claim 1 , further comprising a scale plate disposed between the upper housing and the lens dial.
9. The HVAC controller of claim 8 , wherein the scale plate is secured to the upper housing.
10. The HVAC controller of claim 8 , wherein the scale plate comprises aluminum.
11. The HVAC controller of claim 8 , further comprising a thermometer including a current temperature indicator.
12. The HVAC controller of claim 11 , wherein the scale plate comprises a set point temperature scale, a current temperature scale and a center portion configured to permit the current temperature indicator to extend over the current temperature scale.
13. The HVAC controller of claim 12 , wherein the upper housing includes a raised portion to accommodate the thermometer thereunder.
14. A thermostat comprising:
a housing;
a lens dial rotatably secured to the housing, the lens dial having a periphery and rotating about a rotation axis;
a circuit board adapted to control HVAC equipment, the circuit board including a mechanical movement to electrical signal converter positioned along the rotation axis of the lens dial; and
a mechanical linkage configured to convert movement at or near the lens dial periphery into movement at the mechanical movement to electrical signal converter, the mechanical linkage comprising a set point operator having a first end configured to interact with an engagement member extending from at or near the lens dial periphery and a second, opposing, end configured to interact with the mechanical movement to electrical signal converter.
15. The thermostat of claim 14 , wherein the lens dial is snap fitted onto the housing.
16. The thermostat of claim 14 , wherein the lens dial includes a set point indicator disposed on the lens dial.
17. The thermostat of claim 16 , wherein the lens dial and the set point indicator are integrally molded.
18. The thermostat of claim 14 , further comprising a scale plate secured to the housing and disposed under the lens dial.
19. The thermostat of claim 18 , further comprising a thermometer including a current temperature indicator.
20. The thermostat of claim 19 , wherein the scale plate comprises a set point temperature scale, a current temperature scale and a center portion configured to permit the current temperature indicator to extend onto the current temperature scale.
21. The thermostat of claim 20 , wherein the housing includes a raised portion to accommodate the thermometer thereunder.