Roller blind, particularly for use as blackout shade

Details Roller blind, particularly for use as blackout shade Roller blind, particularly for use as blackout shade

1994-08-24

1996-07-16

Purol, David M.

Flexible or portable closure, partition, or panel

Roll type

With guides or fabric edge holders

160279, E06B 956

Patent

active

055358063

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a roller blind, particularly for use as a blackout shade, comprising a spring-biassed roller bar designed to be mounted at the top of a window opening and a blind rolled on the roller bar and having along its lateral edges guide members guided in tracks provided in guide rails disposed at both sides of the window opening, a bottom bar for the blind being likewise provided, at both ends, with guide means engaging guideways in said guide rails, and being further controlled by means of a cord arrangement with a cord which from a fixture means at the bottom of one guide rail is passed through the part of said guide rail positioned beneath the bottom bar, the bottom bar itself, and the part of the other guide rail positioned above the bottom bar, to a fixture means at the top of the other guide rail.
In roller blinds to be mounted in connection with skylights in inclined roofs use is made of a spring-biassed roller bar ensuring that the blind is kept tight in all positions between the completely raised position and the maximum drawn bottom position.
In order to enable the bottom bar to be arrested in its bottom position and in a number of intermediate positions it is known to mount side rails along the longitudinal sides of the window frame, the side rails being provided with downwards facing recesses for engagement with pins or the like at the ends of the bottom bar. This makes it possible to retain the bottom bar in a limited number of intermediate positions.
Such comparatively simple side rails are, however, not usable in connection with blinds for blackout shades of the above mentioned type, in which the side guide rails must be designed so as to ensure light-proofness at the edges of the window. At the top and at the bottom of the window opening light-proofness is obtained by providing the roller bar, which is most frequently enclosed in a cassette, as well as the bottom bar with appropriate sealing strips.
In U.S. Pat. No. 785,806 a roller blind of the above mentioned type is disclosed in which the movement of the bottom bar is controlled by a double cord arrangement ensuring parallel guidance of the bottom bar in relation to the roller bar, thereby preventing the bottom bar from getting jammed due to careless operation.


SUMMARY OF THE INVENTION

In comparison with the prior art it is the object of the invention to provide a design of a roller blind, particularly for blackout shading, which makes it possible to retain the bottom bar against the spring bias force exerted on the roller bar in arbritrary positions between the top position and the bottom position.
with a view to this, a roller blind of the above mentioned type is characterized in that a brake device for retaining the bottom bar in an arbitrary position against the effect of said spring bias includes a friction member mounted in the bottom bar and acting on the cord, a device for tightening the cord being provided in association with one of said fixture means.
With such a comparatively simple frictional brake device it has turned out to be possible to obtain a braking force which in any position of the bottom roller is sufficient to equalize the spring bias force. As it appears from the following the frictional brake device may be made to cooperate with the cord tightening member and the spring bias of the roller bar in such a manner that the brake force does not reduce the operational comfort.
In a preferred embodiment of the invention the means for parallel guidance include a supplementary cord arrangement passed through the guide rails and the bottom part, in reverse mounting in relation to said cord.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be explained in detail with reference to the schematical drawings, in which
FIG. 1 shows a skylight equipped with a roller blind as a blackout shade, provided according to an embodiment of the invention,
FIG. 2 is a cross-section of a side guide rail,
FIG. 3 is a schematical diagram of a brake device and a device for parallel gui

REFERENCES:
patent: 560133 (1896-05-01), Emery
patent: 564682 (1896-07-01), Burrowes
patent: 577842 (1897-03-01), Davis
patent: 785806 (1905-03-01), Hopkins
patent: 794937 (1905-07-01), Hopkins
patent: 1815551 (1931-07-01), Dunn
patent: 2243771 (1941-05-01), Nye
patent: 2780283 (1957-02-01), Wasserman
patent: 4473101 (1984-09-01), Langeler
patent: 4574864 (1986-03-01), Tse
patent: 4762160 (1988-08-01), Bechtold et al.
patent: 5088543 (1992-02-01), Bilbrey
patent: 5280818 (1994-01-01), Ubelhart

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