Automatic protection device for a roller blind against unauthori

Details Automatic protection device for a roller blind against unauthori Automatic protection device for a roller blind against unauthori

1976-03-01

1977-07-12

Moore, Richard E.

Closure fasteners

Bolts

Swinging

292345, 160220, E05C 2100

Patent

active

040350088

ABSTRACT:
An automatic protection device for a roller blind to prevent unauthorized raising of the blind from the outside by means of two-arm toggle joints whose lever ends are linked at one of the adjacent roller blind staves so that upon unauthorized raising the free toggle joint moves against the flange of U-shaped guide channel in combination with a compensating member in the face region of the upper roller blind stave and movable relative thereto exerts on the locking teeth of the free toggle joint through the action of an additional force means such as an elastic compressible material, a pressure by which the locking teeth are brought against the flange of the guide channel. This not only assures positive locking but also acts to compensate for differences in stave spacings and widths of guide channels thereby reducing manufacturing and inventory costs.

REFERENCES:
patent: 3302692 (1967-02-01), Grau
patent: 3659886 (1972-05-01), Andrews
patent: 3847423 (1974-11-01), Gley
patent: 3850465 (1974-11-01), Hill et al.

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