Composite-type ruler

Details Composite-type ruler Composite-type ruler

1985-10-18

1987-03-31

Martin, Jr., William D.

Geometrical instruments

Straightedge type

Square and fixed straightedge

33451, 33DIG1, B43L 700

Patent

active

046531947

ABSTRACT:
A square is usable in association with a tape ruler. The square includes a ruler member as a base bar and a transverse longitudinal member formed at one side of the ruler member. An arc member is formed at the other side of the ruler member. A pair of guides are provided at the front and back surfaces of the ruler member. Each guide has two guiding grooves for receiving a respective tape ruler of different width. A permanent magnet is buried in each guide in order to maintain engagement between the guide and the tape ruler when the square is slid along the tape ruler.

REFERENCES:
patent: 2382250 (1945-08-01), Newell
patent: 2900729 (1959-08-01), Basile
patent: 3503131 (1970-03-01), Warner
patent: 4128030 (1978-12-01), Kundikoff
patent: 4352247 (1982-10-01), Rohde

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