Flexible or portable closure – partition – or panel – Pleating type – Lazy-tong links pivot about axes parallel to panel
Patent
1989-08-14
1992-03-03
Purol, David M.
Flexible or portable closure, partition, or panel
Pleating type
Lazy-tong links pivot about axes parallel to panel
160170, A47H 5032
Patent
active
050923820
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention pertains to blinds for windows or other uses, and particularly, to blinds which are raised and lowered by means of one or more pull-up bands.
2. Description of the Prior Art
Such blinds are disclosed in the state of the art by U.S. Pat. No. A-2,676,654. In these blinds, the winding rollers are firmly connected to the winding shaft without axial play, and a separate bracket, which is fastened to the wall, is arranged next to each winding roller.
Blinds of this type, in which the winding rollers are displaceable in the axial direction of the winding shaft with an axial play and in which each winding roller is also equipped with a bracket as well as with an adjusting ring, are disclosed in EP-A-0,118,700.
These blinds have the disadvantages that they cannot be used for slanted windows, in which the winding shaft is arranged obliquely, and the winding rollers can only hold about 3 m of cord because of limited space behind the blinds.
The basic task of the present invention is to create blinds of the above-described type, which avoid these disadvantages and yet can be installed simply and are reliable in operation.
SUMMARY OF THE INVENTION
The task is accomplished by an improved apparatus for raising and lowering the pull-up band for a blind. An axially rotatable winding shaft is disposed generally parallel to a section rail, which may be attached, for example, to a wall above a window. At least one winding roller is disposed along the winding shaft, the winding roller having an axis of rotation extending generally horizontally and perpendicular to the winding shaft. The winding roller is adapted to extend and retract a pull-up band wound onto the winding roller. Drive means permit the transference of motion from the winding shaft to the winding roller. The winding roller is rotatably mounted within a holder, and a housing detachably fastened to the section rail encloses the drive means.
Even if the winding shaft is in a markedly oblique position, pull cords and pull bands are satisfactorily wound up without rubbing, for which reason the blinds according to the present invention are also suitable for slanted windows. The diameter is not limited to the distance between the blinds and the window and may be substantially greater, and the blinds can be correspondingly longer. Damage to the blinds due to tangential rubbing on the winding rollers is avoided according to the present invention. Separate brackets can be dispensed with, which substantially simplifies the installation and stocking of parts.
One variant of the invention includes a self-locking worm drive, which creates a simple braking mechanism, by which the blinds are automatically stopped in any desired intermediate position.
In an other variant of the invention, the worm-drive is of a suitable transmission ratio so that an additional braking mechanism is unnecessary and with which even heavy blinds can be pulled up with little force due to the transmission ratio of the worm drive.
High unwinding velocity and destruction of the winding mechanism, of the control member or of the blinds as a consequence of the rapid deceleration of the mass are avoided. Accidents with the blinds due to a weight section rushing down at high speed may also not occur according to the present invention.
Invention prevents the pull-up member from being caught during winding up or down, and it permits a simple installation.
In the preferred embodiment a self-locking worm drive is arranged between the drive member and the winding shaft. The drives between the winding rollers and the winding shaft can be ordinary, inexpensive drives without self-locking mechanism. A drive wheel is preferably mounted such that an arrangement similar to the winding rollers is obtained.
Embodiments of the present invention are explained in greater detail below on the basis of the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows installed blinds for a slanted window and blinds for an ordinary window,
FIG. 2 sho
REFERENCES:
patent: 1084781 (1914-01-01), Behrle
patent: 2676654 (1954-04-01), Vallen
patent: 3844330 (1974-10-01), Hyman
patent: 4518025 (1985-05-01), Judkins
patent: 4610290 (1986-09-01), Dorflinger
patent: 4850415 (1989-07-01), Rometsch
patent: 4901419 (1990-02-01), Voss
K. Bratschi, Silent Gliss
Purol David M.
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