Screen roll means

Details Screen roll means Screen roll means

1986-05-12

1987-07-21

Jillions, John M.

Winding, tensioning, or guiding

Strand tensioning device

Tortuous course

2421077, 160294, B65H 7548, E06B 920

Patent

active

046812792

ABSTRACT:
An improved take-up mechanism for a roll-up type screen, wherein the screen is pulled out to a desired length, and then by simple pulling and releasing, rolled up on the shaft. The shaft is automatically locked at the desired length of screen by engagement of a lock roller projected by a cam magnet. During pulling out operation, a magnet, a covering yoke and a cylinder disposed therebetween do not move with respect to each other, whereas during roll up operation under force of the wound up spring, the cylinder rotates under control of the magnetic field between the yoke and magnet to control the speed of roll up. The improvement comprises lock rollers on a cam magnet, one way clutches, roll holder, and ring lock for the rollers, together with the magnet to produce the above effects.

REFERENCES:
patent: 2031459 (1936-02-01), Chambliss
patent: 2557005 (1951-06-01), McMullen
patent: 2758527 (1956-08-01), McFadden
patent: 2815179 (1957-12-01), Keljik
patent: 4172563 (1979-10-01), Werner et al.
patent: 4466475 (1984-08-01), Saito et al.
patent: 4498517 (1985-02-01), Mase

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