Household refrigerator including a vacation switch

• US 4,197,717 A
• Filed: 12/23/1977
• Issued: 04/15/1980
• Est. Priority Date: 12/23/1977
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Schumacher, Frank A.
• Primary Examiner(s): King, Lloyd L.
• Assistant Examiner(s): Tapolcai, William E.
• Application Number:
  US05/863,983
• Time in Patent Office: 844 Days
• Field of Search: 62/233, 62/234, 62/213
• US Class Current: 62/213
• CPC Class Codes: F25B 2400/052 between the capillary tube and another part of the refrigeration cycle
• CPC Class Codes: F25B 2400/054 between the suction tube of the compressor and another part of the cycle
• CPC Class Codes: F25B 2700/21152 at the discharge side of the compressor
• CPC Class Codes: F25D 21/002 Defroster control
• CPC Class Codes: F25D 2700/12 Sensors measuring the inside temperature
• CPC Class Codes: F25D 29/00 Arrangement or mounting of control or safety devices
• CPC Class Codes: G05D 23/1902 characterised by the use of a variable reference value
• CPC Class Codes: G05D 23/275 with sensing element expanding, contracting, or fusing in response to changes of temperature

Abstract

An automatically-defrosting household refrigerator including a user-operable "vacation switch" effective to enable the operation of the refrigerator in a mode appropriate to a condition of zero usage. When the vacation switch is thrown to the vacation position, the user is assured at once that unnecessary energy consumption will be avoided and the likelihood of failure of the refrigerator while unattended will be diminished. The mode appropriate to a condition of zero usage includes having the interval between successive automatic defrosting operations extended. Additionally, the vacation switch may be effective to simultaneously disable an automatic icemaker, to increase the temperature set point of the thermostatic control means which maintains the temperature within the refrigerator to disable anti-condensation heaters, and to disable butter conditioner heaters.

There is further disclosed a particular means for extending the interval between successive automatic defrosting operations. A temperature-responsive switch is mounted so as to be responsive to the temperature of a predetermined portion of the refrigeration system high side. The switch is closed at ambient temperature and opens at a predetermined temperature which is reached by the predetermined portion of the refrigeration system high side a few minutes into each operating cycle of the refrigerator compressor. The temperature-responsive switch is arranged to disable the defrost control timer when the sensed temperature exceeds the predetermined value during each operation of the refrigeration system. During normal operation of the refrigerator, the temperature-responsive switch is bypassed, and the defrost control timer operates normally.

Claims

1. An automatically-defrosting household refrigerator including an automatic icemaker comprising:

a user-operable vacation switch effective to enable the operation of said refrigerator in a mode appropriate to a condition of zero usage, including extending the interval between successive automatic defrosting operations and disabling the icemaker.

2. A refrigerator according to claim 1, further comprising means for preventing the interruption of said icemaker during an ice-ejection cycle.

10. A refrigerator according to claim 1, further comprising a defrost interval control timer;

and

wherein means for extending the interval between successive automatic defrosting operations comprises means for periodically interrupting said defrost interval control timer when the zero usage mode is enabled by said vacation switch.

11. A refrigerator according to claim 10, wherein said defrost interval control timer is motor driven;

and

said means for periodically interrupting said defrost interval control timer comprises a cam-operated switch connected electrically in series with the motor of said defrost control timer.

3. An automatically-defrosting household refrigerator including an electrical anti-condensation heater for an external portion of said refrigerator, comprising:

a user-operable vacation switch effective to enable the operation of said refrigerator in a mode appropriate to a condition of zero usage, including extending the interval between successive automatic defrosting operations and disabling the anti-condensation heater.

4. A refrigerator according to claim 3, further comprising:

thermostatic means for controlling the interior temperature of said refrigerator, said thermostatic control means having a temperature set point; and

means for increasing the temperature set point of said thermostatic control means when the zero usage mode is enabled by said vacation switch.

5. A refrigerator according to claim 4, wherein said means for increasing the temperature set point of said thermostatic control means comprises:

the thermostatic control means having a normal thermostat and a vacation thermostat, said vacation thermostat adjusted to a higher temperature setting than said normal thermostat; and

circuit means for alternatively enabling said thermostats, said vacation thermostat being enabled when the zero usage mode is enabled by said vacation switch.

6. A refrigerator according to claim 4, wherein said thermostatic control means has a temperature sensing element located within the refrigerated space;

and

wherein said means for increasing the temperature set point of said thermostatic control means comprises;

heater means for biasing said temperature sensing element; and

means for disabling said biasing heater means when the zero usage mode is enabled by said vacation switch.

7. An automatically-defrosting household refrigerator including thermostatic means for controlling the interior temperature of said refrigerator, said thermostatic control means having a temperature set point, comprising:

a user-operable vacation switch effective to enable the operation of said refrigerator in a mode appropriate to a condition of zero usage, including extending the interval between successive automatic defrosting operations and increasing the temperature set point of said thermostatic control means.

8. A refrigerator according to claim 7, wherein said means for increasing the temperature set point of said thermostatic control means comprises:

the thermostatic control means having a normal thermostat and a vacation thermostat, said vacation thermostat adjusted to a higher temperature setting than said normal thermostat; and

circuit means for alternatively enabling said thermostats, said vacation thermostat being enabled when the zero usage mode is enabled by said vacation switch.

9. A refrigerator according to claim 7, wherein said thermostatic control means has a temperature sensing element located within the refrigerated space;

and

wherein said means for increasing the temperature set point of said thermostatic control means comprises;

heater means for biasing said temperature sensing element; and

means for disabling said biasing heater means when the zero usage mode is enabled by said vacation switch.

12. In an automatically defrosted refrigerator including a refrigerant compressor, a refrigeration system high side having a compressor exhaust line and a refrigerant condenser, and timing means for determining the interval between successive defrosting operations, an arrangement for extending the interval between successive defrosting operations, which arrangement comprises:

switching means for selecting either normal or extended intervals between successive defrosting operations;

a temperature responsive switch responsive to the temperature of a point on said refrigeration system high side; and

means responsive to said switching means for enabling said timing means continuously during operation of said compressor when said switching means is selecting normal defrost intervals, and for disabling said timer means when the temperature sensed by said temperature responsive switch exceeds a predetermined value during each operation of said compressor when said switching means is selecting extending defrost intervals.

13. A refrigerator according to claim 12, wherein said switching means is a vacation switch effective to enable the operation of the refrigerator in a mode appropriate to a condition of zero usage, the mode appropriate to a condition of zero usage including extending the normal interval between successive automatic defrosting operations.