Geometrical instruments – Scriber
Patent
1989-04-26
1990-08-21
Will, Thomas B.
Geometrical instruments
Scriber
33 1M, 33 2303, 346139R, B43L 1300
Patent
active
049494660
ABSTRACT:
A drawing device adapted to produce line drawings or sketches on a transparent screen on top of a case partly filled with a powder that adheres slightly to the undersurface of the screen to render it opaque. Disposed within the case are transverse and longitudinal rods operatively coupled to respective control knobs, one of which, when turned, causes the longitudinal rod to shift toward either side of the case, the other of which, when turned causes the transverse rod to shift to either end of the case. Supported at the intersection of the rods is an indexable stylus turret and carrier assembly whose carrier is slidably supported on the transverse rod and whose stylus turret which is received within the carrier, is slidably supported on the longitudinal rod whereby the position occupied by the assembly is determined by the point of intersection. The turret is indexable to present to the underside of the screen, for scraping powder therefrom to draw a line, any one of three styluses each producing a line of different width or character or to present a blank stylus which interrupts the drawn line. Indexing is effected by pressing an actuator bar operatively coupled to the longitudinal rod carrying the turret to depress this rod and to cause a turret pin to engage an abutment in the carrier, this action causing the turret to index to its next operative position.
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Streifler, J. J., "Plastic Scribing" Photogrammetric Engineering, Apr. 1957, vol. 23, no. 2, pp. 330-335.
Auer Robert T.
Chung Jore M.
Mayer Richard J.
Buddy L Corporation
Ebert Michael
Will Thomas B.
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