belt pulley

Abstract

Belt pulley (1) for roller shutters with a winding core (1.1) and with at least one edge disc (1.2a, 1.2b) for limiting the winding space of the roller shutter belt (1.7) comprising a clamping element (2) for fixing the roller shutter belt (1.7) to the belt pulley (1).

Description

[0001] The invention relates to a belt pulley according to claim 1.

[0002] Belt pulleys are used to hold the roller shutter belt in belt-driven roller shutters. Typically, such a belt pulley is fixed to the shaft that holds the roller shutter curtain. Conventional belt pulleys have a protruding, nose-like extension on their winding core, into which the end of the belt, equipped with a corresponding hole, is simply hooked. After prolonged use and due to material fatigue, this protruding section, made of plastic or thin sheet metal, often breaks off. Consequently, the roller shutter can no longer be operated, as there is no longer a positive connection between the belt and the pulley, and the belt can no longer rotate the pulley or the roller shutter shaft. Since repair is not possible, at least the belt pulley usually has to be replaced, which incurs high repair costs.

[0003] The invention provides a novel belt pulley that functions reliably even after prolonged operation of the roller shutter, thus avoiding high repair costs. An embodiment of the invention is explained in more detail below with reference to the drawing. This shows Fig. 1: A schematic representation of a roller shutter belt pulley Fig. 2: a section through the winding core of the belt pulley with a first clamping element Fig. 3: a cut through the winding core of the belt pulley with a second clamping element Fig. 4: a section through the winding core of the belt pulley with a clamping element and a toothed ratchet

[0004] Fig. Figure 1 shows a schematic representation of the pulley 1 of a roller shutter. The pulley 1 serves to wind up a roller shutter strap with which the roller shutter is operated. For this purpose, the pulley 1 is positively and non-rotatably connected to the roller shutter shaft (not shown) onto which the roller shutter curtain is wound. Pulling or releasing the roller shutter strap causes the pulley and the roller shutter shaft, which is coupled to it in a rotationally fixed manner, to rotate. This winds up or down the roller shutter curtain. The in Fig. A schematically depicted belt pulley 1 comprises a substantially hollow cylindrical winding core 1.1, which is bounded by edge discs 1.2a, 1.2b. The roller shutter belt 1.7 is wound onto this winding core 1.1 when the roller shutter curtain is lowered. When the roller shutter is opened, the roller shutter belt is unwound from the winding core 1.1 and wound onto a belt winder accessible in the room. A slot 1.5 is provided in the outer wall of the winding core 1.1, through which the end piece of the roller shutter belt 1.7 is inserted into the interior of the winding core 1.1 and clamped there by means of a clamping element 2. According to the invention, a clamping element 2 is arranged inside the winding core 1.1, which is each in Fig. 2, Fig. 3 and Fig. 4 is shown.

[0005] In a first embodiment ( Fig. 2) The clamping element 2 is designed as a solid cylinder or a hollow cylindrical cup, which is rotatably mounted eccentrically inside the winding core 1.1 on a shaft (not shown in detail in the drawing). The axis of rotation of the winding core 1.1, and thus of the belt pulley 1 itself, is labeled M1 in the figure. The eccentrically arranged axis of rotation of the clamping element 2 is labeled M2. The end piece of the roller shutter belt 1.7 is inserted into the interior of the winding core 1.1 through the opening in the outer wall of the winding core 1.1 and clamped there between the clamping element 2 and the inner wall of the winding core 1.1.

[0006] In the through Fig. In the illustrated embodiment 3, the clamping element 2 has an elliptical cross-section.

[0007] In the further embodiment according to Fig.4. The clamping element 2 is connected to a toothed lock 3. This means that when inserting the roller shutter strap 1.7, only a rotational movement of the clamping element 2 in the direction of arrow P is possible.

[0008] In all embodiments, the roller shutter strap 1.7 can now be reliably wound onto or unwound from the winding core 1.1.

[0009] To increase the clamping effect of the clamping element 2, the outer surface of the clamping element 2 facing the inner wall of the winding core 1.1 can advantageously be designed to increase friction. This can be advantageously achieved by roughening the surface of the clamping element 2. In a further embodiment of the clamping element 2, barbs are incorporated into the outer surface of the clamping element 2, which engage with the clamped roller shutter strap 1.7. Reference symbol list 1 belt pulley 1.1 Winding core 1.2a Edge disc 1.2b Edge disc 1.5 slot 1.7 Roller shutter strap 2 clamping elements 3-tooth lock

Claims

[1] Belt pulley (1) for roller shutters with a winding core (1.1) and with at least one edge disc (1.2a, 1.2b) for limiting the winding space of the roller shutter belt (1.7) comprising a clamping element (2) for fixing the roller shutter belt (1.7) to the belt pulley (1). [2] Belt pulley (2) according to claim 1, characterized by , that the clamping element (2) is designed as an essentially cylindrical or hollow cylindrical body which is rotatably mounted inside the winding body (1.1) and coaxially to it. [3] Belt pulley (1) according to one of the preceding claims, characterized by , that the clamping element (2) is mounted eccentrically inside the winding core (1.1). [4] Belt pulley (1) according to one of the preceding claims, characterized by , that the clamping element (2) has an elliptical cross-section. [5] Belt pulley (1) according to one of the preceding claims, characterized by, that the clamping element (2) is connected to a toothed lock (3) which only allows a rotational movement of the clamping element (2) in the insertion direction (arrow P) of the roller shutter strap (1.7).

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