Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Internally threaded fastener element – e.g. – nut – etc. – Having cap
Reexamination Certificate
1998-12-30
2001-02-13
Wilson, Neill (Department: 3627)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Internally threaded fastener element, e.g., nut, etc.
Having cap
C411S303000, C411S376000
Reexamination Certificate
active
06186719
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is related to an improvement in the structure of a capped lock nut and in particular to one which can be easily manufactured.
2. Description of the Prior Art
The conventional capped lock nut generally includes a nut body formed with an upwardly extending flange on which is welded a cap for preventing dust or like to enter into the nut body. However, such a capped lock nut is easily loosened when subject to vibration. Hence, a nylon packing has been proposed to be secured on the top of the nut body in such a way that the upper portion of the nylon packing extends upwardly out of the nut body and a cap is riveted or otherwise secured to the top of the nut body. Nevertheless, the cap will be easily separated from the nut body when the lock nut is engaged with a long screw thereby producing sharp edges and therefore often causing injuries to the operator. Hence, it must be very careful to engage such a capped lock nut with a long screw thus making it difficult to use and increasing the cost. The reason why the cap is riveted but not welded to the nut body is that the nylon packing will be deformed or even melted if the cap is welded to the nut body. In addition, it is time-consuming to fasten the cap on the nut body by rivets thereby lowering the production rate and therefore increasing the cost.
Therefore, it is an object of the present invention to provide an improvement in the structure of a capped lock nut which can obviate and mitigate the above-mentioned drawbacks.
SUMMARY OF THE INVENTION
This invention is related to an improvement in the structure of a capped lock nut.
It is the primary object of the present invention to provide an improved capped lock nut having which can be easily manufactured.
It is another object of the present invention to provide an improved capped lock nut wherein the cap can be firmly welded on the nut body.
It is still another object of the present invention to provide an improved capped lock nut which is manufactured by electric welding thereby producing no noise pollution.
It is still another object of the present invention to provide an improved capped lock nut which is low in cost.
It is a further object of the present invention to provide an improved capped lock nut which is fit for mass production.
The foregoing objects and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
REFERENCES:
patent: 3955231 (1976-05-01), Erdmann
patent: 4993902 (1991-02-01), Hellon
patent: 5752793 (1998-05-01), Wu
patent: 195009 (1990-08-01), None
A & J
Wilson Neill
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