DE20114335U1 - Roller blind - Google Patents

Description

29 August 2001

Yuh San Corp. Ltd. Fu Shin Hsiang, Changhua Hsien, Taiwan

Roller blind

The present innovation relates to a roller blind which essentially consists of a winding tube or winding rod supported at both ends, onto which the curtain is wound, the rotation being effected, for example, by means of an endless drive cable or chain hanging down in a large loop, and by pulling on one or the other strand of the cable loop, the roll is rotated in the sense of raising or lowering the curtain.

Usually, a drive bearing unit is inserted into the ends of the winding tube on one side and a follower bearing unit on the other side and these units are held or supported in mounting brackets which in turn are screwed to the ceiling or wall above the window.
25

One problem here is the reliability of the connection between the bearing units and the fastening fittings, especially if the latter are mounted too far apart from each other or not exactly aligned. It can then easily happen that the connection at one end of the roller blind roll is lost and it falls down. This danger is particularly present if the drive cable is pulled violently

-2-
or is operated jerkily.

The present innovation aims to avoid these disadvantages and to create a roller blind in which a reliable connection between the bearing units and the fastening fittings cannot be lost, even in the event of inaccurate assembly of the fastening fittings and/or jerky operation of the drive cable.

The solution to the problem arises from the protection claims.

The innovation is explained further below by describing an embodiment using the attached drawings. It shows?

Fig. 1 is a perspective exploded view of the two bearing points of a roller blind;

Fig. 2 the two bearing points in perspective

representation, assembled;

Fig. 3 shows the longitudinal section through the bearing points with

the curtain held between them; 25

Fig. 4 shows the illustration according to Fig. 3 with tilted mounting of a bearing point;

Fig. 5 the representation according to Fig. 3 with mounting that is not exact with regard to the distance between the bearing points.

ge.

When looking at Fig. 3 first, it is clear how a curtain 30 made of textile or other suitable material wound around a winding tube 20 is held between two bearing points, whereby the bearing point on the left in the drawing is the bearing point that effects the rotary drive. Both bearing points consist of a fastening fitting 10, 60 to be fastened to the ceiling or wall above the window opening and bearing units 40, 50 that can be connected to these.

The drive fastening fitting 10 is of angular shape and one of its arms has a cover 14 for the heads of the screws with which it is screwed to the wall or ceiling. On the inside of its other arm, a coupling receptacle 11 is formed in which a coupling recess 12 is cut out. This consists of two channel-like recesses crossing at right angles, each of which has a snap-in undercut 13 at both ends.

The associated drive bearing unit 40 has a drive pin 44 mounted on a bearing plate, which can be set in rotation by means of a drive cable 43. A coupling piece 41 is formed on the rear side of the bearing plate, the elongated shape of which corresponds to a channel-like depression of the coupling recess 12. A retaining lug 42 is formed on the lower end of the coupling piece 41, which is intended to engage in a locking undercut 13.

The bearing mounting bracket 60 is of similar angular shape and also has a cover 64 for

-4-

the heads of the screws with which one of its arms is screwed on. In its angled arm, an insertion channel 61 is formed on the inside, the lower surface of which is recessed in the middle to form a semicircular bearing shell 62. The diameter of this is stepped to form a shoulder in such a way that the rear part - further out in the axial direction - has a larger diameter and forms an anchor collar trough 63.

The associated bearing unit 50 is a pure follower bearing unit and consists only of a bearing journal 53, on the outer face of which an axle stub 52 protrudes, the end of which has a short section of larger diameter that forms an anchor collar 51. The small diameter of the axle stub 52 corresponds to the diameter of the inner section of the bearing shell 62 and the diameter of the anchor collar 51 to that of the anchor collar pan 63.

For assembly, the fastening fittings 10, 60 are screwed on and the pins 44, 53 of the bearing units 40 ₇ 50 are inserted into the ends of the winding tube 20 with the wound curtain 30. The drive bearing unit 40 is then connected to its fastening fitting 10 in such a way that the coupling piece 41 enters the vertical channel of the coupling recess 12 and is lowered so that the retaining lug 42 engages in the corresponding locking undercut 13. It can be seen that this creates a connection which can also absorb tensile forces if necessary.

-5-

Now the bearing pin 53 at the other end of the curtain can be pushed with its axle stub 52 from the side into the insertion channel 61 and, when it reaches the middle of the channel, can be lowered into the bearing shell 62. The anchor collar 51 comes to lie in the anchor collar trough 63, which obviously also creates a connection that can transmit tensile force.

The design described and taking into account the elasticity of the plastic parts make assembly and reliable operation possible even if the fastening fittings are not attached very precisely. Even if the parts are subjected to a certain pre-tension, the function is not impaired. The risk of one end of the winding tube falling out of its bearing position is eliminated.

•# φφφ #··· · · ϕ * φ ··· · » · •&phgr;&phgr; ···· φ ··#· φ φ · · · φ φφφ φφ·· φ &phgr;&phgr;&phgr;&phgr;&phgr; · ···

• φφ &phgr;&phgr;&phgr;&phgr;&phgr;&phgr;&phgr;&phgr; φφ ··« ·&phgr;&phgr; φ ·φ ·· φφφ ·· · · φ

Claims (3)

1. Roller blind with a winding tube ( 20 ) winding and unwinding the curtain ( 30 ),
one end of which is mounted on the drive pin ( 44 ) of a drive bearing unit ( 40 ) which can be driven by means of a drive cable ( 43 ) and which can be connected to a drive fastening fitting ( 10 ) made of plastic,
and the other end of which is mounted on the bearing pin ( 53 ) of a follower bearing unit ( 50 ) which can be connected to a plastic bearing mounting fitting ( 60 ),
characterized in that , in order to connect the drive fastening fitting ( 10 ) to the drive bearing unit ( 40 ), the latter has a protruding coupling piece ( 41 ) on its outer surface facing the fitting ( 10 ), on which a retaining lug (42) projects downwards at a distance from the outer surface, and a coupling receptacle ( 11 ) is formed on the inner surface of the drive fastening fitting ( 10 ), in which at least one coupling recess ( 12 ) for the coupling piece ( 41 ) is recessed, and this has a snap-in undercut ( 13 ) for the retaining lug ( 42 ) on at least one end,
and that for connecting the bearing fastening fitting ( 60 ) to the idler bearing unit ( 50 ), the latter has an axle stub ( 52 ) on its outer end face, at the end of which an anchor collar ( 51 ) of larger diameter is formed, and on the inside of the bearing fastening fitting ( 60 ) an insertion channel ( 61 ) is provided, in the end of which an approximately semicircular bearing shell ( 62 ) for the axle stub ( 52 ) is recessed,
which at its outer end jumps to the larger diameter of the anchor collar ( 51 ) to form a trough ( 63 ) for the latter. 2. Roller blind according to claim 1, characterized in that two coupling recesses ( 12 ) crossing at right angles with locking undercuts ( 13 ) at each of their ends are formed in the coupling receptacle ( 11 ). 3. Roller blind according to claim 1 or 2, characterized by covers ( 14 , 64 ) provided on the inner sides of the fastening fittings ( 10 , 50 ) for the screws with which they are fastened to the ceiling or wall.