Cutting by use of rotating axially moving tool – Tool-support – With tool-retaining means
Reexamination Certificate
1999-05-07
2001-01-09
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Tool-support
With tool-retaining means
C279S145000, C408S11500B, C408S226000
Reexamination Certificate
active
06171033
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is a kit having parts for making an extender for a hand drill to the length needed at a work site, where electrical conduit, readily available at the work site, is used to make the extender.
It frequently occurs at work sites that an extender is needed so that a hand drill can be used to make a hole at a considerable distance from where the hand drill can be easily used. This occurs, for example, when holes for electrical conduit need to be drilled between studs in finished walls from a basement through to a near floor and through to a far floor. Even if the length of the extender needed could be predicted, it would be inconvenient to carry a pre-made extender from work site to work site.
This problem has been long recognized and prior art shows that a solution has been long sought. People seeking a solution however have focused on schemes for devising variable length extenders. Examples are shown by Bocchio in U.S. Pat. No. 1,414,110; by Hamann in U.S. Pat. No. 3,865,502; by Salyers in U.S. Pat. No. 4,474,513, and by Carroll in U.S. Pat. No. 5,624,214.
Variable length extenders can not work very well because of the number of movable joints which must be included, and they are still inconvenient to carry from site to site. Making a variable length extender smaller so that it is less inconvenient to carry about introduces more movable joints and thus makes the extender less reliable and less safe to use. There remains a need for an extender which has reliable and safe joints and which can be used easily.
The invention shown here is based on a discovery of a new solution to this old problem. The new solution is to provide a kit which comprises parts which can be used with electrical conduit, readily available at work sites, to easily make an extender having the length needed at the particular site. This extender has secure joints so that it can be used reliably and safely. It can be disassembled after use, and only the parts comprising the kit need be carried from site to site.
This solution is not suggested in any prior art nor by any combinations of prior art.
SUMMARY OF THE INVENTION
Objects of this invention comprise requirements listed in the following imperatives. Make a hand drill extender kit which has a chuckable part which can be secured in a hand drill chuck and which can be secured in a near end of a length of electrical conduit. Provide in the kit a tool holder part into which a tool can be secured and which can be secured in a far end of the electrical conduit. Secure the chuckable part and the tool holder part in the electrical conduit ends by means of fasteners passing diametrically through the electrical conduit.
Other objects of alternative forms of the invention comprise requirements listed in the following imperatives. Provide in the kit a jig for drilling a holes along a diameter of the conduit at the conduit near end and along a diameter of the conduit at the conduit far end so that the holes match holes through the chuckable part and through the tool holder part and so that fasteners through these holes secure the chuckable part and the tool holder part in the conduit ends. Provide in the kit a coupler which can secure two components of the length of electrical conduit. Provide in the kit an auxiliary tool holder part which can hold tools with larger diameter chuckable shafts. Include in the kit a sample length of conduit with the holes pre-drilled.
Other objects will be comprehended in the drawings and detailed description, which will make additional objects obvious hereafter to persons skilled in the art.
In summary one embodiment of this invention is a kit comprising a chuckable part which can be secured in the chuck of a hand drill and which can be secured in a near end of a length of electrical conduit; and has a tool holder part into which a tool can be secured, and which can be secured in a far end of the length of conduit.
Other equivalent embodiments will be comprehended in the drawings and detailed description, which will make additional equivalent embodiments obvious hereafter to persons skilled in the art.
REFERENCES:
patent: 1414110 (1922-04-01), Bocchio
patent: 2721592 (1955-10-01), Baker
patent: 3011369 (1961-12-01), Russell
patent: 3138183 (1964-06-01), Stewart
patent: 3865502 (1975-02-01), Hamann
patent: 4474513 (1984-10-01), Salyers
patent: 5624214 (1997-04-01), Carroll
Howell Daniel W.
Moyer Don
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