Geometrical instruments – Scriber – Curved line
Patent
1977-02-09
1978-11-21
Phillips, Charles E.
Geometrical instruments
Scriber
Curved line
33 80, 83745, B43L 500
Patent
active
041259424
ABSTRACT:
A guide rod is clamped at each end across a board placed flat on a workbench or comprising the workbench. Clamps on each end of the board have extensions with sleeves on their upper ends for receiving the guide rods, as well as flat bars which square against the edges of the board, such that the guide rod will be perpendicular to the sides of the board. In a preferred embodiment, the upper sleeves are pivotable and the clamps are provided with a protractor and square such that the guide rod can be placed across the board at an angle other than perpendicular. A guide carriage comprising a yoke fitting around the guide rod is slideably disposed thereon by means of four wheels, two at each end on either side. The guide carriage has a short rod transversely slideably disposed to the guide rod with a set screw for fixing the extension of the short rod at a given distance from the guide rod. An adjustable H-shaped clamp is secured at the end of the short rod for clamping a hand tool, such as a circular saw, on top of the board such that the hand tool can be moved across the board in a straight line determined by the guide rod.
REFERENCES:
patent: 2735455 (1956-02-01), Frosberg
patent: 2786372 (1957-03-01), Lassy
patent: 2942633 (1960-06-01), King
patent: 3059337 (1962-10-01), Lynch
patent: 3827468 (1974-08-01), Markham
patent: 4016649 (1977-04-01), Kloster
Horner Ralph J.
King Dwight W.
Caplan Julian
Phillips Charles E.
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