Electrical outlet safety device

• US 8,956,168 B2
• Filed: 05/14/2013
• Issued: 02/17/2015
• Est. Priority Date: 05/14/2013
• Status: Active Grant

• Current Assignee: Kuwait University
• Original Assignee: Kuwait University
• Inventors: Al-Anzi, Bader Shafaqa
• Primary Examiner(s): Gilman, Alexander
• Application Number:
  US13/894,378
• Publication Number:
  US 20140342590A1
• Time in Patent Office: 644 Days
• Field of Search: 439/152, 439/155, 439/159, 439/153, 439/163, 439/160
• US Class Current: 439/159
• CPC Class Codes: H01R 13/635 by mechanical pressure, e.g. spring force
• CPC Class Codes: H01R 13/6666 with built-in overvoltage protection
• CPC Class Codes: H01R 13/6683 with built-in sensor
• CPC Class Codes: H01R 13/7132 having ejecting mechanisms
• CPC Class Codes: H01R 24/30 with additional earth or shield contacts
• CPC Class Codes: H01R 24/78 with additional earth or shield contacts
• CPC Class Codes: H01R 31/065 with built-in electric apparatus

Abstract

The electrical outlet safety device is placed between an electrical plug and the corresponding electrical outlet or receptacle to which the plug is connected. The safety device includes a thin body portion formed of a material adapted to expand rapidly if exposed to a predetermined temperature. A series of thin, electrically and thermally conductive blades extends from the body, with the blades being captured between the prongs of the plug and the internal contacts of the receptacle when installed therewith. If excessively high electrical resistance and correspondingly high temperature are produced in one or more of the electrical connections between the plug and the outlet, the blades of the safety device transmit the excessive temperature to the body, whereupon the body is transformed to an expansive electrically insulating foam that expels the plug from the receptacle. Springs may be included within the body to provide additional expansive force.

Claims

1. An electrical outlet safety device for removable installation between an electrical plug and an electrical receptacle, the safety device comprising:

a thin, flat body portion having a plug face;

a receptacle face opposite the plug face;

a plurality of passages therethrough, the passages corresponding to the prongs of an electrical plug, the body portion being made from compressed material adapted to expand rapidly upon reaching a predetermined temperature, thereby forcefully ejecting the electrical plug from the electrical socket when the body portion is installed therebetween;

a plurality of electrical contacts extending from the body portion, the electrical contacts communicating electrically with the electrical plug and the electrical receptacle when the body portion is installed therebetween; and

amperage sensing means disposed within the body portion for sensing current flowing through the electrical contacts and for rapidly expanding the compressed material of the body portion when the amperage sensing means senses a predetermined amperage, thereby forcefully ejecting the electrical plug from the electrical socket when the body portion is installed therebetween.

2. The electrical outlet safety device according to claim 1, wherein each of the electrical contacts is thermally conductive, the device further comprising temperature sensing means for sensing the temperature of the electrical contacts and for rapidly expanding the compressed material of the body portion when the temperature sensing means senses a predetermined temperature, thereby forcefully ejecting the electrical plug from the electrical socket when the body portion is installed therebetween.

3. The electrical outlet safety device according to claim 1, further comprising:

an electrically conductive blade adjacent to each of the passages of the body portion, each of the blades extending from the receptacle face and normal thereto;

amperage sensing means disposed within the body portion for sensing the amperage of current flowing through the blades; and

at least one spring compressively disposed within the body portion between the plug face and the receptacle face thereof, the spring communicating electrically with the amperage sensing means, the spring expanding rapidly upon reaching a predetermined amperage as sensed by the amperage sensing means, thereby forcefully ejecting the electrical plug from the electrical socket when the body portion is installed therebetween.

4. The electrical outlet safety device according to claim 1, wherein the compressed material of the body portion comprises a fire extinguishing agent.

5. The electrical outlet safety device according to claim 1, wherein the compressed material of the body portion forms an electrically insulating foam upon said rapid expansion.

6. The electrical outlet safety device according to claim 1 wherein the body portion has a periphery substantially congruent with the electrical plug.

7. An electrical outlet safety device for removable installation between an electrical plug and an electrical receptacle, the safety device comprising:

a thin, flat body portion having a plug face, a receptacle face opposite the plug face, and a plurality of passages therethrough, the passages corresponding to the prongs of an electrical plug, the body portion being made from compressed material capable of rapid expansion;

a plurality of electrical contacts extending from the body portion, the electrical contacts communicating electrically with the electrical plug and the electrical receptacle when the body portion is installed therebetween; and

amperage sensing means disposed within the body portion for sensing the amperage of current flowing through the electrical contacts and for rapidly expanding the compressed material of the body portion upon reaching a predetermined amperage, thereby forcefully ejecting the electrical plug from the electrical socket when the body portion is installed therebetween.

8. The electrical outlet safety device according to claim 7, wherein the compressed material of the body portion is also adapted to expand rapidly upon reaching a predetermined temperature, thereby forcefully ejecting the electrical plug from the electrical socket when the body portion is installed therebetween.

9. The electrical outlet safety device according to claim 7, wherein the electrical contacts comprise an electrically conductive blade adjacent to each of the passages of the body portion, each blade extending from the receptacle face and normal thereto, the device further comprising at least one spring compressively disposed within the body portion between the plug face and the receptacle face thereof, the spring communicating electrically with the amperage sensing means, the spring expanding rapidly upon reaching a predetermined amperage as sensed by the amperage sensing means, thereby forcefully ejecting the electrical plug from the electrical socket when the body portion is installed therebetween.

10. The electrical outlet safety device according to claim 7, wherein each of the electrical contacts is thermally conductive, the device further comprising temperature sensing means for sensing the temperature of the electrical contacts, the compressed material of the body portion also being adapted to expand rapidly when the temperature sensing means senses a predetermined temperature, thereby forcefully ejecting the electrical plug from the electrical socket when the body portion is installed therebetween.

11. The electrical outlet safety device according to claim 7, wherein the compressed material of the body portion comprises a fire extinguishing agent.

12. The electrical outlet safety device according to claim 7, wherein the compressed material of the body portion forms an electrically insulating foam upon said rapid expansion.

13. The electrical outlet safety device according to claim 7, wherein the body portion has a periphery substantially congruent with the electrical plug.

14. An electrical outlet safety device for removable installation between an electrical plug and an electrical receptacle, the safety device comprising:

a thin, flat body portion having a plug face, a receptacle face opposite the plug face, and a plurality of passages therethrough, the passages corresponding to the prongs of an electrical plug;

an electrically conductive blade adjacent to each of the passages of the body portion, each of the blades extending from the receptacle face normal thereto;

amperage sensing means disposed within the body portion for sensing the amperage of current flowing through the electrical contacts; and

at least one spring compressively disposed within the body portion between the plug face and the receptacle face thereof, the spring communicating electrically with the amperage sensing means, the spring expanding rapidly upon reaching a predetermined amperage as sensed by the amperage sensing means, thereby forcefully ejecting the electrical plug from the electrical socket when the body portion is installed therebetween.

15. The electrical outlet safety device according to claim 14, wherein each said blade is thermally conductive and the body portion is made from a compressed material, the device further comprising temperature sensing means for sensing the temperature of the electrical contacts and for rapidly expanding the compressed material of the body portion when the temperature sensing means senses a predetermined temperature, thereby forcefully ejecting the electrical plug from the electrical socket when the body portion is installed therebetween.

16. The electrical outlet safety device according to claim 14, wherein:

each said blade comprises an electrical contact communicating electrically with the electrical plug and the electrical receptacle when the body portion is installed therebetween; and

the body portion comprises compressed material adapted to expand rapidly when the amperage sensing means senses a predetermined amperage, thereby forcefully ejecting the electrical plug from the electrical socket when the body portion is installed therebetween.

17. The electrical outlet safety device according to claim 14, wherein the compressed material of the body portion comprises a fire extinguishing agent.

18. The electrical outlet safety device according to claim 14, wherein the compressed material of the body portion forms an electrically insulating foam upon said rapid expansion.

19. The electrical outlet safety device according to claim 14 wherein the body portion has a periphery substantially congruent with the electrical plug.