A - Human Necessities – 47 – B
Patent
A - Human Necessities
47
B
33/73
A47B 27/00 (2006.01) B43L 5/00 (2006.01) B43L 7/04 (2006.01) B43L 12/02 (2006.01) B43L 13/08 (2006.01)
Patent
CA 1285384
ABSTRACT DRAUGHTING TABLES, DRAWING BOARDS, DRAWING INSTRUMENTS AND ANALOGOUS APPARATUS Drawing boards and drawing instruments for use therewith are described. The surface of the board (1) has a set of parallel-running, evenly spaced magnetic poles 12) across it. Each drawing instrument has a cylinder (10) with similar parallel magnetic poles running essentially axially along it. The cylinder is freely rotatably mounted (12) and preferably held a little bit away from the board surface. The cylinder (10) preferentially orientates with its magnetic poles aligned with those (2) on the board surface. This orientation can be accurately maintained across the entire surface of the board without the use of cumbersome mechanical arrangements to ensure alignment of drawing instruments. When not required for use, the drawing instrument may simply be removed from the surface of the board. A ruler/protractor device (3) and a carriage bearing a pair of rules set at right angles are described. (Fig. 1)
533681
Frazer Stephen O.
Knight Jonathan
Riddiford Martin
Frazer Stephen O.
Frazer Design Consultants Limited
Gowling Lafleur Henderson Llp
Knight Jonathan
Riddiford Martin
LandOfFree
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