Cut-back thermostat construction

• US 4,129,847 A
• Filed: 06/06/1977
• Issued: 12/12/1978
• Est. Priority Date: 06/06/1977
• Status: Expired due to Term

• Current Assignee: Robertshaw Controls Company (Schneider Electric SE)
• Original Assignee: Robertshaw Controls Company (Schneider Electric SE)
• Inventors: Teichert, Allen L.
• Primary Examiner(s): Harris, George
• Application Number:
  US05/803,978
• Time in Patent Office: 554 Days
• Field of Search: 337/301, 337/302, 337/303, 337/304, 337/305
• US Class Current: 337/301
• CPC Class Codes: H01H 37/62 Means other than thermal means for introducing a predetermined time delay

Abstract

A cut-back thermostat construction having a thermostat arrangement and a timer carried by a housing in such a manner that the timer will cut back the temperature setting of the thermostat arrangement by moving an electrical switch of the thermostat arrangement relative to a temperature responsive switch operator of the thermostat arrangement when a predetermined time is reached by the timer. A movable actuator is operatively associated with the switch to be adapted to cause a certain movement of the switch relative to the switch operator when the actuator is moved from a first position thereof to a second position thereof by the timer when the predetermined time is reached. An adjustable member is separate from the actuator and is adapted to select the amount of movement of the switch relative to the switch operator when the actuator is moved from the first position thereof to the second position thereof whereby the adjustable member selects the cut-back temperature of the thermostat arrangement. A pair of spaced stops are carried inside the housing for limiting the degree of adjustment of the adjustable member and, thus, the amount of movement of the switch relative to the switch operator. The timer comprises a rotatable time indicating dial carrying an adjustable tab to be set at different positions therewith for selecting the predetermined time for adjusting the thermostat arrangement, the adjustable tab being snap-fitted to the dial.

Claims

1. In a cut-back thermostat construction having a thermostat arrangement and a timer means carried by a housing means in such a manner that said timer means will cut-back the temperature setting of said thermostat arrangement by moving an electrical switch means of said thermostat arrangement relative to a temperature responsive switch operator of said thermostat arrangement when a predetermined time is reached by said timer means, said construction also having movable actuator means that is carried by said housing means and is operatively associated with said switch means to be adapted to cause a certain movement of said switch means relative to said switch operator when said actuator means is moved from a first position thereof to a second position thereof by said timer means when said predetermined time is reached by said timer means, said construction also having adjustable means that is carried by said housing means and is separate from said actuator means for selecting the amount of movement of said switch means relative to said switch operator when said actuator means is moved from said first position thereof to said second position thereof whereby said adjustable means selects the cut-back temperature of said thermostat arrangement, the improvement comprising stop means carried inside said housing means for limiting the degree of adjustment of said adjustable means and, thus, the amount of movement of said switch means relative to said switch operator.

2. In a cut-back thermostat construction as set forth in claim 1, biasing means interconnected to said switch means to normally tend to move said switch means to its greatest cut-back temperature position relative to said switch operator.

3. In a cut-back thermostat construction as set forth in claim 2, said actuator means being engageable with said switch means to hold said switch means in its least cut-back temperature position relative to said switch operator in opposition to the force of said biasing means when said actuator means is in said first position thereof.

4. In a cut-back thermostat construction as set forth in claim 3, said adjustable means comprising a movable member that is adapted to be positioned in the path of movement of said switch means to limit the movement of said switch means from its said least cut-back temperature position to a desired cut-back temperature position thereof.

5. In a cut-back thermostat construction as set forth in claim 4, said movable member comprising a lever pivotally mounted to said frame means and having one end thereof adapted to be positioned in said path of movement of said switch means.

6. In a cut-back thermostat construction as set forth in claim 5, said stop means being engageable with said one end of said lever to limit the position of said one end in said path of movement of said switch means.

7. In a cut-back thermostat construction as set forth in claim 6, said one end of said lever having an outwardly directed tongue, said stop means comprising a pair of spaced abutments with said tongue being disposed and movable therebetween.

8. In a cut-back thermostat construction as set forth in claim 1, said adjusting means comprising a movable member, said stop means being engageable with said movable member to limit the position of said movable member and, thus, the amount of movement of said switch means relative to said switch operator.

9. In a cut-back thermostat construction as set forth in claim 8, said adjusting means comprising a pair of spaced stops.

10. In a cut-back thermostat construction as set forth in claim 9, said movable member having a pair of tongues thereon, one of said tongues being disposed and movable between said stops and the other of said tongues being disposed and movable in the path of movement of said switch means.

11. In a thermostat construction having a thermostat arrangement and a timer means carried by a housing means in such a manner that said timer means will adjust the temperature setting of said thermostat arrangement when a predetermined time is reached by said timer means, said timer means comprising a rotatable time indicating dial carrying an adjustable tab to be set in different positions therewith for selecting a desired predetermined time for adjusting said thermostat arrangement, the improvement wherein said adjustable tab is snap-fitted to said dial.

12. In a thermostat construction as set forth in claim 11, said dial having a hub portion, said tab being snap-fitted to said hub portion of said dial.

13. In a thermostat construction as set forth in claim 12, said tab having a ring portion telescopically receiving said hub portion, said ring portion being split to provide for said snap-fit relation.

14. In a thermostat construction as set forth in claim 13, said hub portion having an annular recess therein, said tab having said split ring portion snap-fitted into said annular recess.

15. In a thermostat construction as set forth in claim 11, another adjustable tab being snap-fitted to said dial.

16. In a timer dial for a thermostat construction having a thermostat arrangement and a timer means carried by a housing means in such a manner that said timer means will adjust the temperature setting of said thermostat arrangement when a predetermined time is reached by said timer means, said time indicating dial carrying an adjustable tab to be set in different positions therewith for selecting a desired predetermined time for said timer means to adjust said thermostat arrangement, the improvement wherein said adjustable tab is snap-fitted to said dial.

17. In a timer dial as set forth in claim 16, said dial having a hub portion, said tab being snap-fitted to said hub portion of said dial.

18. In a timer dial as set forth in claim 17, said tab having a ring portion telescopically receiving said hub portion, said ring portion being split to provide for said snap-fit relation.

19. In a timer dial as set forth in claim 18, said hub portion having an annular recess therein, said tab having said split ring portion snap-fitted into said annular recess.

20. In a timer dial as set forth in claim 16, another adjustable tab being snap-fitted to said dial.