Switch for electrical wall receptacle with ground fault protection

• US 4,010,431 A
• Filed: 08/29/1975
• Issued: 03/01/1977
• Est. Priority Date: 08/29/1975
• Status: Expired due to Term

• Current Assignee: Hubbell, Inc.
• Original Assignee: Westinghouse Electric Corporation (Paramount Global (f/k/a ViacomCBS Inc.))
• Inventors: Misencik, John J., Wiley, Roy O., Virani, Gopal J.
• Primary Examiner(s): Broome, Harold
• Application Number:
  US05/609,134
• Time in Patent Office: 550 Days
• Field of Search: 335/18, 335/192, 317/18 D, 317/112
• US Class Current: 335/18
• CPC Class Codes: H01H 71/00 Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
• CPC Class Codes: H01H 83/02 operated by earth fault currents H01H83/14 takes precedence

Abstract

An electric receptacle with ground fault protection characterized by an insulating rectangular housing adapted for mounting in a wall outlet box. The housing comprises opposite end and edge walls with front and rear sides open and with a transverse partition dividing a chamber formed by the ends and side walls into a pair of side-by-side compartments. Partition aperture means between the compartments and the first compartment communicating with the open front side and the second compartment communicating with the open rear side. Receptacle components are disposed in the first compartment and electronic components are disposed in the second compartment, and the components in each compartment are so disposed as to minimize the space requirements for the receptacle. The receptacle components include a contact arm which carries one contact for each of two pairs of contacts and the arm is movable between open and closed positions of the contacts and is operatively connected to a latch member releasably holding the arm in the contact closed position. Ground fault sensing means for monitoring the flow of current through the receptacle is provided for releasing the latch member, whereby the contacts on the arm are opened and closed sequentially.

Claims

1. An electric receptacle for mounting in a wall outlet box for connecting an electrical load to the conductors of a power source, comprising socket means for receiving a plug of an electrical load, a first pair of cooperable contacts operable between open and closed positions, a second pair of cooperable contacts operable between open and closed positions, an operating mechanism including a contact arm carrying one contact of each pair of contacts and movable between open and closed positions of the contacts, a latch member releasably holding the arm in the closed position, bias means engaging the arm for urging the arm to the open position when the latch member is released, a pivot rib for the contact arm, the bias means urging the arm to pivot about the first pair of contacts during an initial movement of the arm when released to open the second pair of contacts and to then pivot about the pivot rib during a final movement of the arm to open the first pair of contacts, ground fault sensing means for monitoring the flow of current through the socket means, and release means responsive to the fault sensing means for releasing the latch member from the contact arm, whereby the first and second pairs of contacts are opened sequentially.

2. The electric receptacle of claim 1 in which the contacts on the arm are located at opposite ends thereof, and the pivot rib is located intermediate the contacts.

3. The electric receptacle of claim 1 in which the other contacts of each pair are located on opposite sides of the arm.

4. The electric receptacle of claim 3 in which the pivot rib is nearer one contact than the other.

5. The electric receptacle of claim 1 in which the first pair of contacts are connected to the neutral conductor of the power source and the second pair of contacts are connected to the line conductor of the power source.

6. The electric receptacle of claim 5 including reset means for returning the contacts to the closed position, and the contacts being unclosable by the reset means during continued existence of a ground fault.

7. The electric receptacle of claim 6 in which third contact means are located in the path of movement of the arm at the open position thereof, the third contact means being operatively connected to open a circuit through the release means when the arm is in the open position.

8. The electric receptacle of claim 7 in which the third contact means comprises a contact button in detachable engagement with one of the conductors of the power source when the arm is in the closed position, and resilient means for urging the button in the closed position when the arm is not in the open position.

9. The electric receptacle of claim 8 in which the contact button is engaged with the line conductor.

10. The electric receptacle of claim 8 in which the contact button is closed before the arm reaches the closed position of the contacts.