Flexible or portable closure – partition – or panel – Roll type – With rotating means
Patent
1998-11-23
2000-09-26
Johnson, Blair M.
Flexible or portable closure, partition, or panel
Roll type
With rotating means
160318, 185 13, 185 43, A47G 502
Patent
active
061231401
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to production of roller curtains or the like, which are applied to windows for darkening, for preventing insects from entrance, and the like.
In particular, the present invention concerns configuration of the curtain rolling up elastic means, their supports, and the connection system between the roller support shaft and the rolling up elastic means.
DESCRIPTION OF THE PRIOR ART
These curtains, commonly called roller or roll up curtains, are usually wound on a roller, which is rotatably supported, in horizontal position, inside a box-like casing situated in the region of the window inner upper edge.
The roller can rotate axially for curtain unrolling and subsequent rolling up.
Amongst all the types of roller curtains, there are two groups of them distinguished according to the unrolling and rolling mechanism type. One of these types includes elastic means, usually a helical spring situated inside the winding roller and fastened thereto, so that unrolling rotation determines its torsion and consequent elastic reaction can be used later for rolling up the curtain.
The curtain is unrolled by directly pulling it downwards and then suitable locking means keep it in the desired position until it is to be rolled up.
Another type of curtain does not include elastic means and is operated manually also for rolling it up.
A small pulley is fastened to the roller head and has a suitably shaped groove into which an operating chain fits for unrolling and rolling up the curtain.
In the first type of curtain, one end of the elastic means is rigidly fastened to the roller while the other end is fixed to the window frame, so that the elastic means are stressed in relation to the curtain unrolling.
According to known techniques, in order to avoid spring undulation, one of its extremities is fastened to a longitudinally moving element situated inside the roller, which rotates along with the roller.
Nevertheless, it is obvious that in case of curtains of a certain length, reaching the end of the unrolling stroke will require a high number of turns of the roller, and spring elastic reaction and torsional stress will be considerable.
This fact provokes problem in dimensioning of the springs to be used which anyway do not return an elastic reaction that fits the necessary strength for rolling up the curtain in a uniform way.
Moreover, the supports of the rolling up spring must be adequate for the elastic reaction to be determined and this increases the dimension of the supports and the global cost of the curtain production.
Furthermore, montage of the rolling up assembly is complicated, since the assembly includes the coupling element between the roller and one extremity of the rolling up spring, the spring, and a shaft which passes through the whole roller and fastens the other extremity of the spring to the casing containing the curtain.
All these elements must be assembled inside the roller and adapted to its transversal dimension, which corresponds to the curtain width.
Therefore, the spring tension problem becomes important when a long and narrow curtain must be unrolled and rolled up, because the length of the spring will not be adequate and thus it will be excessively stressed.
In case of curtains operated completely manually, called also friction curtains, the lack of the elastic reaction determines the necessity of considerable strength for rolling the curtain up, a strength which increases in relation to the length of the curtain unrolled.
To cope with this problem, the diameter of the driving pulley must be large to allow curtain rolling up and unrolling with a reduced effort, also for reducing the size of the operating chain. However, the support dimensions must be determined on the basis of the torque which is created in the regions of the ends of the roller. This has effect on the global dimension of the casing containing the curtain.
Another problem encountered with the conventional friction curtain devices is that the unrolling and rolling up device must
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Johnson Blair M.
Sapone, Esq. William J.
Sunproject S.R.L.
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