Geometrical instruments – Straightedge type – Square and sliding nonpivotal straightedge
Patent
1979-10-29
1981-07-28
Phillips, Charles E.
Geometrical instruments
Straightedge type
Square and sliding nonpivotal straightedge
B43L 1300
Patent
active
042802822
ABSTRACT:
A template for measuring and scribing tread and riser lines for the construction of a stairway, or similar purposes, which comprises: a plate member defining first and second straight edges which, in turn, define a square corner. First and second movable stop means are respectively carried by the first and second straight edges. The second edge is defined by a separate portion of the plate member carried by it and movable along a path of travel parallel to the second edge. Fulcrum arm means are pivotally attached to both the separate portion and the rest of the plate member, so that pivoting of the fulcrum arm means moves the separate portion and second stop means to predetermined positions along the path of travel. Accordingly, the distances between the respective stop means along the straight edges from the square corner may be adjusted, and the resulting adjusted template may be used to scribe tread and riser lines of predetermined lengths in a manner which is substantially more convenient than prior art techniques.
REFERENCES:
patent: 1770304 (1930-07-01), Ferris
patent: 2499721 (1950-03-01), Cassity
patent: 4098160 (1978-07-01), Weil
Ellis Garrettson
PAJ Corporation
Phillips Charles E.
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