Geometrical instruments – Gauge – Collocating
Reexamination Certificate
1999-05-19
2001-07-10
Gutierrez, Diego (Department: 2859)
Geometrical instruments
Gauge
Collocating
C033S630000, C033S628000
Reexamination Certificate
active
06256899
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improved guide for a hand held power cutting tool and, more particularly, to a guide for a hand held power cutting tool of the type having a blade extending through a base plate and wherein the guide is adjustable to compensate for an offset distance between an edge of the base plate and the blade of the cutting tool.
2. Description of the Related Art
When cutting a work piece, such as a 2×4 board, to fit snugly between two existing parallel elements, ordinary practice requires the use of a rule to measure the inside distance and transfer that measurement to the work piece, where a scriber and a carpenter's square are used to mark the cut line, which is usually followed freehand with a hand held power cutting tool. The accuracy of cutting using this method often varies. Time and motion are wasted compared to the use of the present invention, a tool which, after being adjusted to work with a particular hand held power cutting tool, first measures an inside distance and secondly is placed on the work piece and used to guide that particular hand held power cutting tool to produce a cut-off piece equaling the inside distance measured.
Numerous types of guides for use in connection with hand held power cutting tools are known in the art. Many such prior art devices, however, have the disadvantages of being unduly complicated and often difficult to use. Other such prior art devices encounter difficulties in aligning the guide device in spaced relation to the desired cut line to allow for the distance between the blade and the edge of the base plate through which the blade extends.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a guide for a hand held power cutting tool which measures distances between objects when used as an inside sliding caliper and which is easily adjustable to accommodate cutting tools having different blade offsets.
A further object of the invention is to provide a guide for a hand held power cutting tool which may be used with various sizes of cutting tools and in which means are provided to position the straight edge of the guide a predetermined distance from a desired cut line, depending on the offset position of the blade extending through the base plate.
Another object of the invention is to provide a guide for a hand held power cutting tool in which the guide is first positioned on a work piece to be cut and part of the cutting tool mates with a straight edge portion of the guide to assure a straight and accurate cut.
A still further object of the invention is to provide a guide for a hand held power cutting tool provided with a stem element having distance gradations thereon in order to set the guide to produce a cut-off piece whose length corresponds to the measurement indicated on the stem element.
The present invention achieves the above and other objects by providing a guide for a hand held power cutting tool of the type having a blade extending through a base plate wherein the guide is adjustable to compensate for an offset distance between an edge of the base plate and the blade to permit use as an inside sliding caliper. The guide includes a stem element having distance gradations thereon and a cutting tool guide piece attached to an end of the stem element. A shoe element is provided for engaging surfaces at the free end of a work piece and an anvil element is adjustably connected to the shoe element whereby the shoe element is movable longitudinally with respect to the anvil element. The anvil element engages an upper surface of the shoe element to form an opening therewith through which the stem element slidably passes with the stem element being adjustable longitudinally with respect to the opening to position the guide piece at a location whereby when an edge of the base plate of the cutting tool engages the front face of the guide piece, the blade will cut the work piece at a desired length.
These and other features and advantages of the present invention will become more apparent with reference to the following detailed description and drawings.
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De Jesus Lydia M.
Gutierrez Diego
Mattingly, Stanger & Malur
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