Drawing instrument and locking apparatus therefor

Details Drawing instrument and locking apparatus therefor Drawing instrument and locking apparatus therefor

1983-01-24

1984-05-22

Little, Willis

Geometrical instruments

Straightedge type

Base attached

33430, 33433, B43L 502, B43L 1314

Patent

active

044493045

ABSTRACT:
A drawing instrument and locking apparatus therefor in which the locking apparatus can be made of polyethylene, polypropylene or the like and is not subject to fragmentation or permanent damage during normal use. A displaceable member of the locking apparatus is displaceable into a groove of a drawing board to lock the drawing instrument in position thereon. An outer ring member freely rotatable through 360 degrees around the displaceable member when the displaceable member is in its raised condition engages the displaceable member when the displaceable member is in its depressed condition upon rotation of the ring member to unlock the apparatus.

REFERENCES:
patent: 282248 (1883-07-01), Weidenmann
patent: 329392 (1885-10-01), Jordan
patent: 2187574 (1940-01-01), Nigra
patent: 2501296 (1950-03-01), Tyler
patent: 2504532 (1950-04-01), Kahan
patent: 3363319 (1968-01-01), Greer
patent: 3537183 (1970-11-01), Anderson
patent: 3786568 (1974-01-01), Schultz et al.

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