Lamp socket with a pull string switch

Details Lamp socket with a pull string switch Lamp socket with a pull string switch

1999-02-04

2001-02-13

Bradley, Paula (Department: 2833)

Electrical connectors

With stress relieving means for conductor to terminal joint

Curved conductor path

C439S438000, C439S420000

Reexamination Certificate

active

06186822

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to a lamp socket with a pull string switch, particularly to one preventing power leads from loosening off, or becoming badly connected with terminals, so as to keep good quality of the power leads in transmitting power and safety of using electricity.
A known traditional lamp socket with a pull string switch is shown in
FIG. 1
, includes a socket body
1
and a screw base
2
as main components.
The socket body
1
is made of an insulating material, having two terminals
11
,
12
at two sides for connecting two power leads of a single phase, and a Pull string switch
13
is combined in the socket body
1
for turning on and off a lamp screwed in the socket body
1
.
The screw base
2
is made of a conductive material, and having screw grooves for a lamp to screw with.
Though the known traditional lamp socket with a pull string switch has a function to turn on and off a a lamp, the power leads fixed with the terminals
11
and
12
may fall off the terminals
11
and
12
in case of the screws loosened or the power leads accidentally pulled excessively by an improper force. Even if the power leads do not fall off the terminals
11
and
12
but only contact not well with the terminals, there might arise uneven load current, which might cause large load current to start a fire.
SUMMARY OF THE INVENTION
The present invention has been devised to offer a lamp socket with a pull string switch, which can prevent power leads from loosening off terminals or growing not well connected with the terminals, so as to keep stability of the power leads and safety of using electricity.
A main feature of the invention is two power lead protectors formed on a socket body for protecting the power leads to stop accidental force of Pulling them and preventing the accidental force from transmitted to the terminals to keep the both well connected with each other.


REFERENCES:
patent: 1057320 (1913-03-01), Barr

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