In-line strain relief

Details In-line strain relief In-line strain relief

1999-12-22

2001-12-11

Paumen, Gary (Department: 2833)

Electrical connectors

With stress relieving means for conductor to terminal joint

Curved conductor path

C439S369000

Reexamination Certificate

active

06328594

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to strain reliefs in general, and more particularly, to an in-line strain relief used on an electrical cord.
BACKGROUND OF THE INVENTION
A known method of providing strain relief in electrical cords, e.g., when used in lamps, has been the Underwriters' Laboratories approved knot “U.L. knot” (see FIG.
1
). Such a knot is used to prevent the electrical cord from becoming detached from the internal terminals of an electrical device, e.g., the light bulb socket of a lamp, when the portion of the cord that is exterior to the device is pulled. The strain relief provided by the knot is achieved by tying the knot inside the electrical device such that the knot rests against a hole in the device through which the cord passes. When the cord is pulled on, the knot abuts the hole, thereby preventing further pulling of the wire. While the U.L. knot is effective for relatively thin wires, it is not very effective when used with thicker wires that are now a required standard in electrical devices such as lamps.
SUMMARY OF THE INVENTION
A strain relief for an electrical cord has a body with an opening extending therethrough from a first side to a second side thereof. The opening accommodates an electrical cord therein. A bridging member extends from the body proximate to the second side, bridging the opening. The bridging member is capable of supporting a loop in the electrical cord disposed in the opening, preventing the loop from passing through the opening.


REFERENCES:
patent: 1029648 (1912-06-01), Wallage
patent: 4545377 (1985-10-01), Cerwin et al.
patent: 4639978 (1987-02-01), Boden
patent: 5810853 (1998-09-01), Yoon
patent: 5817103 (1998-10-01), Bell
patent: 5931702 (1999-08-01), Fladung
patent: 6050840 (2000-04-01), Kowalski et al.

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