Protractor-type hatching control device

Details Protractor-type hatching control device Protractor-type hatching control device

1976-10-05

1978-04-18

Aegerter, Richard E.

Geometrical instruments

Area integrators

Electrical

33110, B43L 1324

Patent

active

040843297

ABSTRACT:
A protractor-type hatching control device having a base segment (leg) cooperable with a straight-edge or the like movably mounted on a drawing board, including an adjustable hatching segment (leg) having a drawing-edge for controlling a drawing instrument (pen or pencil), and pivotally-connected to the base segment for setting to different angles at will for establishing angularity of the hatching; or line-spacer (indexer) carried by the adjustable segment, and settable at will to differently spaced positions relatively to the drawing-edge for uniformly controlling the selected spacing between the hatching drawn by said instrument in working contact with the drawing-edge; a knurled knob threaded on a stem defines the pivotal connection, for locking the hatching segment and line-spacer in their adjusted positions, and release of the know accommodates setting of the line-spacer and/or adjustable segment according to the desired line spacing and angle, respectively; and a provision for knife-like closing of the device by nesting the adjustable element in the base segment for compactness in storing or marketing.

REFERENCES:
patent: 72036 (1867-12-01), Haynes
patent: 1076095 (1913-10-01), Brown
patent: 1632267 (1927-06-01), Beem
patent: 2051741 (1936-08-01), Parker
patent: 2735185 (1956-02-01), Naphtal
patent: 3846914 (1974-11-01), Lam et al.

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