Control system for environmental apparatus

• US 4,232,819 A
• Filed: 07/10/1978
• Issued: 11/11/1980
• Est. Priority Date: 07/10/1978
• Status: Expired due to Term

• Current Assignee: Sentry Controls Incorporated
• Original Assignee: Sentry Controls Incorporated
• Inventors: Bost, Charles
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US05/922,837
• Time in Patent Office: 855 Days
• Field of Search: 165/11, 236/1 R, 236/46 R, 236/47, 62/231, 62/158, 70/276, 70/413, 70/277, 340/542, 361/171, 361/172
• US Class Current: 236/47
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/88 Electrical aspects, e.g. circuits
• CPC Class Codes: F24F 2110/10 Temperature
• CPC Class Codes: F24F 2120/10 Occupancy
• CPC Class Codes: G05D 23/1902 characterised by the use of a variable reference value
• CPC Class Codes: H01H 27/00 Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings combined with plug-and-socket connectors H01R13/70; with current-carrying plug H01R31/08
• CPC Class Codes: Y10T 70/7904 Magnetic features

Abstract

A switching system for controlling operation of conventional environmental apparatus of the type having an electrical connection adapted to be coupled with a supply of electrical current includes a switching circuit in a first housing for making and breaking a circuit connection between the connection and the current supplied, and a control circuit electrically coupling a magnetic detector with the switching circuit in order to operate the switching circuit to alternatively make and break the circuit connection between the power cord and the current supply responsive to detection of a magnetic element.

Claims

1. A switching system for controlling operation of conventional electrical apparatus such as an air conditioner or the like of the type having a power cord adapted to plug into a supply of electrical current, said switching system comprising:

a first housing having first means for receiving said power cord and second means for connecting with said current supply;

a switching circuit in said first housing for making and breaking a circuit connection between said power cord and said current supply through said first and second means;

a second housing;

a magnetic detector with said second housing;

circuit means electrically coupling said magnetic detector with said switching circuit in order to operate said switching circuit to alternately make and break said circuit connection between said power cord and said current supply responsive to detection of a magnetic element adjacent said second houseing, said circuit means including;

(a) means for making said circuit connection responsive to the presence of said magnetic element in said second housing, and breaking said circuit connection responsive to removal of said magnetic means from said second housing;

(b) means for introducing a first time delay period between detection of the removal of said magnetic element in said second housing and breaking of said circuit connection;

(c) means for initiating a second time delay between detection of said magnetic element in said second housing and operation of said switching means;

(d) means for bypassing said second time delay initiating means to energize said switching means following detection of said magnetic element in said second housing; and

a keying mechanism having a magnetic element therewith and dimensioned to permit movement of said magnetic element into and out of said second housing.

2. The system recited in claim 1 wherein said circuit means further includes means for sensing the line voltage of said current supply and preventing energization of said switching circuit when the line voltage of said current supply is abnormal with respect to a predetermined voltage level.

3. The system recited in claim 2 wherein said circuit means further includes means for introducing a second time delay period between operation of said switching circuit and resumption of said predetermined voltage level following sensing of an abnormal voltage condition.

4. The system recited in claim 3 wherein said circuit means further includes temperature sensing means for operating said switching circuit at a preselected temperature level without the presence of said magnetic element in said second housing.

5. The system recited in claim 4 wherein said temperature sensing means comprises a bridge circuit having a temperature sensing element in one leg of said bridge.

6. The system recited in claim 1 wherein said bypassing means comprises a mechanical switch operable responsive to the extension of said keying mechanism through said second housing.

7. A system for providing efficient utilization of environmental control apparatus, comprising:

an enclosure having an access thereto;

environmental control apparatus for controlling the environment in said enclosure;

a supply of electrical current;

a switching circuit interposed between said environmental control apparatus and said supply of electrical current for making and breaking a circuit connection therebetween;

a housing having a magnetic detector;

circuit means electrically coupling said magnetic detector with said switching circuit in order to operate said switching circuit for making said circuit connection responsive to the presence of a magnetic element in said second housing and breaking said circuit connection responsive to the removal of a magnetic element in said second housing, said circuit means including means for introducing a first time delay period between detection of the removal of said magnetic element in said second housing and breaking of said circuit connection;

means in said housing for bypassing said first time delay means for operating said switching means responsive to closure thereof; and

a keying mechanism having a magnetic element therewith and dimensioned to permit movement of said magnetic element into and out of said housing.

8. The system recited in claim 7 wherein said housing is located in said enclosure adjacent said access.

9. The system recited in claim 7 wherein said circuit means further includes means for sensing the line voltage of said current supply and preventing energization of said switching circuit when the line voltage of said current supply is abnormal with respect to a predetermined voltage level.

10. The system recited in claim 9 wherein said circuit means further includes means for introducing a second time delay period between operation of said switching circuit and resumption of said predetermined voltage level following sensing of an abnormal voltage condition.

11. The system recited in claim 7 further comprising temperature sensing means for operating said switching circuit at a predetermined level without the presence of said magnetic element in said housing.

12. The system recited in claim 7 further comprising means for initiating a second time delay between detection of said magnetic element in said housing and operation of said switching circuit.

13. A switching system for controlling operation of conventional electrical apparatus such as an air conditioner or the like of the type having a power cord adapted to plug into a supply of electrical current, said switching system comprising:

a switching circuit for making and breaking a circuit connection between said power cord and said current supply;

circuit means electrically coupled with said switching circuit to make said circuit connection between said power cord and said current supply responsive to the presence of an external stimulus, and breaking said circuit connection responsive to the removal of said external stimulus;

means for introducing a first time delay between removal of said external stimulus and breaking of said circuit connection;

means for introducing a second time delay between detection of said external stimulus and making of said circuit connection; and

a bypass switch for bypassing said second time delay means for initiating operation of said switching circuit for making said circuit connection responsive to operation of said bypass switch.

14. The system recited in claim 13 further comprising:

means for sensing the line voltage of said current supply and preventing energization of said switching circuit when the line voltage of said current supply is abnormal with respect to a predetermined voltage level; and

means for recycling said second time delay initiation means in order to introduce said second time delay period between operation of said switching circuit and resumption of said predetermined voltage level following sensing of an abnormal voltage condition.

15. The system recited in claim 13 further comprising temperature sensing means for operating said switching circuit at a predetermined temperature level without the presence of said external stimulus.