Electrical connectors – With circuit component or comprising connector which fully... – Connector includes or covers additional component
Reexamination Certificate
1999-11-22
2001-07-31
Paumen, Gary (Department: 2833)
Electrical connectors
With circuit component or comprising connector which fully...
Connector includes or covers additional component
C439S620180, C439S106000
Reexamination Certificate
active
06267627
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an improved indoor extension cord power plug that has an easily replaceable protective bus fuse contained in the chamber of the invention and, furthermore, provides for the safe and practical insertion and removal of the present invention into and from mains outlets to achieve economical performance.
2. Description of the Prior Art
In an age of growing technological development, people have become more particular about products for daily life, including various electrical lighting fixtures which are necessary appliances in all households. Since such lighting fixtures require indoor extension cord power plugs, manufacturers have researched and developed indoor extension cord power plugs with built-in protective fuses to increase their safety and practicality as well as prolong the service life of home lighting appliances.
Conventional indoor extension cord power plugs are physically large and heavy and, furthermore, if a fuse is installed in the plug, it is usually situated between the upper and lower housings that are assembled together by means of screw fasteners or fusion. When such a plug is inserted into a mains outlet, the remaining socket of the mains outlet is readily blocked due to its large size, precluding usage by other electrical appliances. Furthermore, the excessive weight increases the cost of materials and leads to user inconvenience, especially since the plug has to be disassembled to replace a burned out fuse, a time and labor consuming task.
Another type of indoor extension cord power plug available on the market has a vertical opening at the front between the prongs for installing the fuse such that when the fuse is expended and must be replaced, needle nosed pliers or other similar tool is utilized to extricate the fuse. This is also inconvenient to the user and, furthermore, the prongs are easily broken, bent, or sheared in the process which results in poor conductance when the plug is inserted into a mains outlet.
In view of the shortcomings and inconveniences of conventional indoor extension cord power plugs, the inventor of the invention herein, based on many years experience in the related industry and with the specialized technology, successfully researched and developed the improved structure indoor extension cord power plug of the invention herein.
SUMMARY OF THE INVENTION
Therefore, the primary objective of the invention is to provide an improved indoor extension cord power plug that allows easy fuse replacement and dependable safety, wherein the bus fuse is held in mounting appendages at the two sides of a chamber cover such that the bus fuse enters an internal chamber when the chamber cover is placed on the housing. A notch is formed on each of the two ends of the chamber cover to facilitate removal. The chamber has a downward oriented opening, four insertion holes, and a post formed along the center and two sides of its bottom section to provide for the insertion of two power prongs and one ground prong, which in conjunction with the bus fuse forms a protective circuit. The cover is installed on the housing, which has a hand hold on the side to facilitate removal from the mains outlets. The structure of the present invention permits the convenient replacement of the bus fuse in the chamber as well as the safe and practical insertion and removal of the present invention into and from mains outlets to achieve economical performance.
Another objective of the invention is to provide an improved indoor extension cord power plug of compact size, configuration, and weight which is lighter than a conventional power plug.
REFERENCES:
patent: 3744003 (1973-07-01), Dipace
patent: 3976967 (1976-08-01), Magherini
patent: 4679884 (1987-07-01), Klemp
patent: 5318460 (1994-06-01), Gilbert
patent: 5634818 (1997-06-01), Deng
patent: 5820413 (1998-10-01), Yamada et al.
patent: 5876250 (1999-03-01), Deng
patent: 6074252 (2000-06-01), Grieve
Dougherty & Troxell
McCamey Sean
Paumen Gary
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