Rollable chart

Details Rollable chart Rollable chart

1978-07-07

1980-05-20

Skogquist, Harland S.

40519, 40522, G09B 2906

Patent

active

042032342

ABSTRACT:
A rollable chart having a web of flexible material wound about two rollers. An endless band extends around pulleys adjacent each roller for manual manipulation. Two unidirectional driving devices are provided each including an internally toothed surface, a disk axially adjacent the toothed surface formed with an inclined cam groove with which a pin on a sliding pawl cooperates.

REFERENCES:
patent: 432914 (1890-07-01), Terrell
patent: 577196 (1897-02-01), Moulthrop
patent: 1237636 (1917-08-01), Gribble
patent: 1585342 (1926-05-01), Gilbert
patent: 1618760 (1927-02-01), Koelkebeck

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