Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Patent
1983-08-08
1985-05-07
Stearns, Richard R.
Geometrical instruments
Straightedge type
Plural straightedges, relatively moveable
33469, 33497, 83437, B26D 706, B43L 706
Patent
active
045149097
ABSTRACT:
An improved miter gauge having means for establishing the angle of a workpiece relative to a tool such as a table saw, with increased resolution and accuracy. The miter gauge includes a guide bar adapted to slidingly engage a groove in the tool. A reference frame having a flat surface against which the workpiece is held, is pivotally mounted on the guide bar. A rotatably mounted angle index dial, graduated to show the miter angle at which the gauge is set, is turned by two intermeshed gears as the reference frame is pivoted about its mount on the guide bar. The intermeshed gears are operative to rotate the angle index dial through a greater angle than the miter angle by a six-to-one ratio to increase the resolution with which the miter angle is set. For example, a 15.degree. change in the miter angle results in a 90.degree. rotation of the angle index dial. Two embodiments show alternative ways to attach one of the gears and angle index dial to the guide bar and reference frame.
REFERENCES:
patent: 1060466 (1913-04-01), Leloup
patent: 1669258 (1928-05-01), Luoma
patent: 1902270 (1933-03-01), Tate
patent: 1985614 (1934-12-01), Merrigan
patent: 2010882 (1935-08-01), Ocenasek
patent: 2502124 (1950-03-01), Bray
patent: 4158320 (1979-06-01), Kay
Anderson Ronald M.
Stearns Richard R.
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