Wall plug

Details Wall plug Wall plug

2001-09-06

2002-09-24

Sircus, Brian (Department: 2839)

Electrical connectors

With insulation other than conductor sheath

Plural-contact coupling part

C439S106000

Reexamination Certificate

active

06454612

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a wall plug, and more particularly, to a wall plug made by nonplastic injection molding and consisting of a housing and a cover both of which are combined while the housing encloses the cover. Accordingly, the assembly is made more easily, the strength is intensified and the wall plug is easily removed from the wall socket.
2. Description of the Prior Art
The blades
11
and the main body
12
of a conventional wall plug, as shown in
FIG. 1
, are disposed in the same direction so that the main body
12
projects from the wall socket to occupy unnecessary room. In order to remove the above-mentioned drawback, a wall plug (see
FIG. 2
) is developed and features the vertical arrangement of the blades
21
to the main body
22
. Thus, when the blades
21
are inserted into the wall socket, the plug leans against the wall without occupying the room. However, this kind of wall plug (e.g. from TW 196786) is made by plastic injection molding so that the electric cable
23
and the blades
21
have to be placed in a mould for forming. Accordingly, the production efficiency is low and the price is high. The most important is that the main body
2
has to be made together with the electric cable
23
so that the plug has a lower strength. Moreover, it's not easy to pull the wall plug out of the wall socket because the holding surface of the fingers is too small. Therefore, an additional pull ring
24
has to be installed for the fingers to pull it out of the wall socket. These are for example from TW 306687 and 383929. When the common plugs are electrically loaded, a high temperature will be created so that the plug body will be slightly softened. The arrangement of the pull ring
24
will increase the concentration of the pulling force on a certain point. Accordingly, the inside of the wall plug will easily cause a short circuit or an interruption, thereby damaging the wall plug.
Referring to
FIG. 3
, another manufacturing method of the conventional wall plug is shown. The plug body
25
consists of an upper and a lower housing
251
,
252
both of which are separately formed first. After the connection of components with one another, the upper and lower housings
251
,
252
are combined together by means of the high frequency or screws. The connection surface
253
of this kind of wall plug is situated in the middle of the height of the plug body. Moreover, projecting ears
26
are pivotably connected between the upper and lower housings
251
,
252
at both sides of the wall plug and serve to be pulled. Accordingly, the pulling force concentrates on the connection surface
253
of the upper and lower housings
251
,
252
so that the plug body
25
is easily broken off, the service life is shortened and the wear is increased.
Furthermore, no matter which kind of the above-mentioned plugs is used, the color and the design can't be fully varied due to the restriction of the basic configuration of the upper and lower housings so that the various designs can't be achieved.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a wall plug which comprises a housing and a cover both of which can be easily connected while the housing enclosed the cover so that the strength of the main body is increased and the assembly is simplified.
It is another object of the present invention to provide a wall plug in which the pulling area of the housing and the fixing members of the blades are the same body so that the strength is intensified in pulling.
It is a further object of the present invention to provide a wall plug which makes use of different colors of the housing and the cover and the appearance of the cover on the surface of the housing to achieve the various designs of the whole body.


REFERENCES:
patent: 3787798 (1974-01-01), Carissimi et al.
patent: 3850496 (1974-11-01), Hague
patent: 4927376 (1990-05-01), Dickie
patent: 5295859 (1994-03-01), Kawai et al.
patent: 5662491 (1997-09-01), Antilla et al.
patent: 6089924 (2000-07-01), Wang
patent: 6250952 (2001-06-01), Shiga et al.
patent: 6267627 (2001-07-01), Lin
patent: 6290533 (2001-09-01), Major

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