Supports – Easel; book – copy or music score holder
Patent
1988-05-03
1989-04-25
Falk, Joseph
Supports
Easel; book, copy or music score holder
312312, A47B 1900
Patent
active
048240648
ABSTRACT:
A vertical drawing board is supported by two A-frame supports, each formed by a pair of pivotally connected legs positioned adjacent opposite sides of the drawing board. Each pair of support legs is retained in an open configuration by a telescoping support strut. The front surface of the drawing board is supported at about a fifteen degree angle with respect to a vertical line. Slide support rods are provided on the A-frame for supporting the drawing board for sliding movement parallel to the front surface of the drawing board. A pulley mounted on a top pivot pin of one of the A-frame supports receives a cable having one end secured to the drawing board and an opposite end attached to a counterweight. By virtue of this arrangement, the drawing board may easily be adjusted and will remain in a selected position without need for any form of fasteners. In a second embodiment, a ratchet pulley mechanism is provided for raising or lowering the drawing board in discreet increments. The ratchet pulley is provided with two spools mounted on a common shaft. A first cable wound on a first spool is secured to the drawing board and a second cable wound on a second spool is secured to a counterweight. This arrangement allows the drawing board to be adjusted up or down in discreet increments with a minimum of force.
REFERENCES:
patent: 1477409 (1923-12-01), Woolman
patent: 2680932 (1954-06-01), Rotschild
patent: 2729018 (1956-01-01), Morgan
patent: 3926398 (1975-12-01), Vincent
patent: 4099469 (1978-07-01), Sahli
patent: 4568132 (1986-02-01), Watt
patent: 4576424 (1986-03-01), Nelson
Falk Joseph
Kearns Jerry T.
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