Geometrical instruments – Straightedge type – Plural straightedges nonadjustably fixed at right angles
Patent
1995-09-28
1999-06-29
Fulton, Christopher W.
Geometrical instruments
Straightedge type
Plural straightedges nonadjustably fixed at right angles
33427, 33484, 33630, 33640, 83745, B27B 904
Patent
active
059158085
ABSTRACT:
A combination carpenter's square and saw guide, and a conversion kit for converting an existing carpenter's square to such combination, utilizes a standard L-shaped square with a channel mounted on each leg of the square and extended in the same direction so that the channels are each extended in the X or Y direction and are on opposite faces of the flat carpenter's square. A rod is axially slidably inserted into each channel, and the distal end of the rod is extended out beyond the corner of the square a distance equal to the distance between the sole plate of a circular hand saw and the plane of the blade, and fixed in this position. The resulting tool is a carpenter's square which also acts as a convenient saw guide, as the workman can back off the square until the tip of the rod aligns with a pencil mark made at the cut line, and use the square for a saw fence. In kit form, a jig is used to produce appropriate bolt holes in the square and the channels which will accommodate either left- or right-handed construction.
REFERENCES:
patent: 1246768 (1917-11-01), Michie
patent: 2772707 (1956-12-01), Leino
patent: 3296702 (1967-01-01), Feddish
patent: 3751816 (1973-08-01), Hayes
patent: 4054077 (1977-10-01), Gram
patent: 4056028 (1977-11-01), Patterson
patent: 4843728 (1989-07-01), Francis
patent: 4961360 (1990-10-01), Peel et al.
patent: 5226345 (1993-07-01), Gamble
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