Electrical plug and receptacle having safety features

Details Electrical plug and receptacle having safety features Electrical plug and receptacle having safety features

2001-02-23

2002-10-22

Ta, Tho D. (Department: 2833)

Electrical connectors

With contact preventer or retractable cover part

Movably mounted

C439S373000, C439S536000, C174S066000, C174S067000, C220S241000, C220S242000

Reexamination Certificate

active

06468095

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to electrical connectors and, more particularly, to an electrical plug and receptacle having safety features for protecting a user from receiving an electrical shock while the user is engaging or disengaging the plug from the receptacle.
BACKGROUND OF THE INVENTION
Electrical plug and receptacle connections, particularly those carrying relatively large amounts of electricity, can pose several dangers, including fire and death. For example, common household electrical receptacles carry alternating current at either 120 volts or 240 volts. A typical plug used with these receptacles has either two or three conductors that extend unshielded from one end of the plug's body. Due to the length of the conductors and the locations of the contacts within the receiver, there is a point where the plug is energized but the conductors are not fully inserted into the receptacle, leaving portions of the energized conductors exposed on the top, sides, and bottom of the plug.
In such a partially-inserted position, there can be enough space between the plug body and the receptacle that an object or a person's finger, particularly a finger of an infant or young child, can contact one or more of the conductors. A person touching one of the energized conductors will receive a shock, possibly resulting in death. In addition, if an object made of a conductive material, such as a metal necklace, falls in the space between the plug body and receptacle and contacts two of the conductors, the object will cause a short circuit and possibly a spark that could cause a fire. Although the foregoing dangers are generally widely known and have been known for many years, the basic design of the household receptacles and plugs has not changed.
Several attempts have been made at providing electrical plugs and receptacles that provide safety features for preventing the above-mentioned dangers. For example, U.S. Pat. No. 5,248,268 to Rinker shows a safety plug and receptacle having a plug that includes non-conductive prongs that contain the conductors. The conductors cannot be touched while the prongs are being inserted into the mating receptacle. Another example is the shielded-conductor plug and receptacle shown in U.S. Pat. No. 4,725,240 to Braverman. This type of connection is designated as an IEC 320 connection. The problem with these safety plugs and receptacles is that they are not compatible with the many millions of conventional receptacles and plugs presently in use throughout the world.
In the United States, for example, if building codes were changed to require the general use of receptacles and plugs of the type shown in the Rinker patent, there would be a great resistance to a change-over because the new receptacles would not be compatible with existing plugs and the new plugs would not be compatible with existing receptacles. A similar situation would result from a requirement to switch to using the IEC 320 type connection shown in the Braverman patent. Although IEC 320 connections are currently available, they are generally used only at the end(s) of a power cord that engage(s) a piece of equipment, such as a computer CPU housing and/or monitor.
SUMMARY OF THE INVENTION
The present invention is directed to an electrical plug and receptacle having safety features. In one aspect, the invention comprises an electrical outlet assembly for an electrical junction box. The assembly includes a receptacle having a base. A receiver is attached to the base, and a plurality of sockets extend into the receiver The receiver is adapted to matingly engage a skirt of a safety plug, and each socket is adapted to receive a conductor of a plug. The assembly further includes a cover formed separately from the receptacle and removably secured to the receptacle. The cover includes an aperture having an inner periphery spaced apart from and surrounding the receiver. The space between the inner periphery and the receiver defines an opening adapted to receive a skirt of a safety plug.
In another aspect, the present invention comprises an electrical safety plug. The plug includes a body having a front surface and a plurality of conductors engaging the body. Each conductor has a contact portion extending away from the front face in substantially parallel relation to the other conductors. The plug further includes a retractable skirt slidably engaging the body. The skirt has an inner peripheral surface and a free end. The skirt has an extended position wherein the free end is located distal from the front face of the body, the inner peripheral surface and the front face defining a cavity substantially containing the contact portions of the conductors. The skirt also has a retracted position wherein the free end is located proximal to front face.


REFERENCES:
patent: 2396901 (1946-03-01), Tiffany
patent: 3281758 (1966-10-01), Appleton
patent: 4810199 (1989-03-01), Kar
patent: 5067907 (1991-11-01), Shotey
patent: 5222899 (1993-06-01), Hulderman
patent: 5401184 (1995-03-01), Sundstrom et al.
patent: 5563373 (1996-10-01), Doroslovac
patent: 5589665 (1996-12-01), Scamacca
patent: 5599196 (1997-02-01), Powell et al.
patent: 6062881 (2000-05-01), Ellison
patent: 6172301 (2001-01-01), Goodsell

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