Electrical connectors – With stress relieving means for conductor to terminal joint – Curved conductor path
Reexamination Certificate
2000-01-06
2001-01-09
Sircus, Brian (Department: 2839)
Electrical connectors
With stress relieving means for conductor to terminal joint
Curved conductor path
Reexamination Certificate
active
06171135
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a lamp base, particularly to one with a structure of letting connecting power wires not pulled off by external force, not loosening off the terminals, very safe to use and convenient to combine.
A known conventional lamp base shown in
FIG. 1
, has a lamp base body
10
made of insulating material, a lamp socket
20
with threads for a lamp to engage with, a housing for preventing dirt, and a cap
40
provided with a wire hole
401
.
The lamp base
10
has two terminals
101
,
102
for connecting two power wires
50
by means of screws or inserting holes. In this example screw connection is shown. The lamp base
10
further has a switch
103
fixed transversely for turning on and off the lamp. And a switch has various structures to handle, such as by turning, pushing or pulling, or with no switches. No matter what structure it may be, its function is the same cap
40
is usually made of metal for good appearance. So an insulating cylinder
301
and am insulating gasket
402
have to be provided respectively to prevent dirt or any bit of miscellaneous matter to enter the lamp base to stick to the two terminals to cause bad contact or unsteady current.
Further, as for the known conventional lamp base and the power wires
50
, their connecting mode and the connected condition are shown in FIG.
2
. The power wires
50
firstly pass through the wire hole
401
and the gasket
402
of the cap
40
, two naked ends connected to the two terminals
101
,
102
. Generally, a knot
501
is made to the power wires
50
to prevent the same from loosening off or becoming bad contact, for the power wires
50
are connected to the terminals
101
,
102
. Function of the know conventional structure is to secure the power wires
50
and more securely locating the power wires
50
by sandwiched between the upper surface of the lamp base body
10
and the bottom of the insulating gasket
402
. Thus, should the power wires be pulled by exterior force, the knot
501
receives the force, not letting the naked points directly pulled off the terminals
101
,
102
.
However, the known conventional connecting mode has been found not really avoiding the connect disadvantages mentioned above, but on the contrary involving difficulty in assembly. A first point is inconvenience of assembling in preparing the length of the power wires
50
so as to connect with the terminals
101
,
102
. A second point is the tightness and the size of the knot
501
, impossible to connect with in case of too short, and difficult to close the cap
40
in case of too large, resulting in extreme difficulty in assembling. In addition, in making a knot, a metal wire inside an insulating tube is bent to disfigure, causing bad transmission or unstableness of electric current, if worse. So this kind of knot is not correct usage of electricity.
SUMMARY OF THE INVENTION
The objective of the invention is to offer a lamp base, which has a structure of easy and quick assemblage, and high safety in use.
The feature of the invention is a tube portion of a proper length formed to extend down from a center wire hole of a cap closing on a housing surrounding a lamp base body and a lamp socket fixed under the lamp base body for a lamp to screw in. When the cap closes an upper end of the housing, the tube portion may press two power wires down on an upper surface of the lamp base body to secure the power wires tightly so as not to let their naked ends separated or loosened from two terminals in the lamp base body if exterior force pulls the power wires by accident
REFERENCES:
patent: 1794274 (1931-02-01), Blumensaadt et al.
patent: 1818614 (1931-08-01), Glade, Jr.
patent: 1829127 (1931-10-01), Cammack
Bacon & Thomas PLLC
Prasad Chandrika
Sircus Brian
Sun Lite Sockets Industry Inc.
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