Geometrical instruments – Straightedge type – Cord type
Patent
1981-07-13
1983-05-10
Haroian, Harry N.
Geometrical instruments
Straightedge type
Cord type
33483, B43L 700
Patent
active
043823408
ABSTRACT:
An apparatus forms a straight edge device when used with an elongate rigid member and a wire. The apparatus comprises a first member having a socket connectable to a first end of the elongate member, a reel for storing and tensioning the wire, and a first wire support for supporting the wire extending from the reel. The first member and the elongate member are entirely to one side of the wire extending from the first support towards a second end of the elongate member. A second member has a socket connectable to the second end of the elongate member. A free end of the wire distal the reel is securable to the second member. There is a second wire support on the second member for supporting the wire such that the second member and the elongate member are entirely to said one side of a straight length of the wire between the first and second wire supports. The length of wire forms a straight edge when the wire is tensioned by the reel.
REFERENCES:
patent: 577708 (1979-02-01), Barrie
patent: 683115 (1901-09-01), Gilliom
patent: 1544153 (1925-06-01), Holmgren
patent: 2655728 (1953-10-01), Cook
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