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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 (1.3) for the releasable fixing of 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 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 cut through the belt pulley Fig. 3: A side view of a clamping element Fig. 4: a top view of a surface of a clamping element Fig. 5: Another side view of a clamping element.

[0004] Fig. Figure 1 shows a schematic representation of a roller shutter pulley 1. 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. The roller shutter belt 1.7 of the roller shutter 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. According to the invention, a clamping element 1.3 is arranged inside the winding core 1.1. A narrow 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 can be guided into the interior of the winding core 1.1 and clamped between the inner wall of the winding core 1.1 and the clamping element 1.3. A compression spring is preferably suitable as the clamping element 1.3. This spring is attached on one side to the inner wall of the winding core 1.1 and its free end rests against the inner wall of the winding core 1.1 with preload. To ensure the clamping effect of the clamping element 1.To increase the friction, the outer surface of the clamping element 1.3 facing the inner wall of the winding core 1.1 can be designed to increase friction. This can advantageously be achieved by roughening the surface 1.4 of the clamping element 1.3. In a further embodiment of the clamping element 1.3 according to... Fig. 5. Barbs 1.6 are incorporated into the surface 1.4 of the clamping element 1.3, which hook into the clamped roller shutter strap 1.7. As in Fig. As shown in Figure 3, the free end piece 1.3a of the clamping element 1.3 is slightly bent to facilitate the threading of the roller shutter strap into the clamping area between the inner wall of the winding core 1.1 and the clamping element 1.3. Reference symbol list 1 belt pulley 1.1 Winding core 1.2a Edge disc 1.2b Edge disc 1.3 Clamping element 1.3a free end piece of 1.3 1.3b Barbs 1.3c Exterior surface 1.5 slot 1.7 Roller shutter strap

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 (1.3) for the releasable fixing of the roller shutter belt (1.7) to the belt pulley (1). [2] Belt pulley (1) according to claim 1, characterized by , that the clamping element (1.3) is a compression spring arranged inside the winding core (1.1) which exerts pressure on an end piece of the roller shutter strap (1.7) inserted between the inner wall of the winding core (1.1) and the compression spring. [3] Belt pulley (1) according to one of the preceding claims, characterized by , that the surface (1.4) of the clamping element (1.3) facing the clamped end piece of the roller shutter strap (1.7) is designed to increase friction. [4] Belt pulley (1) according to one of the preceding claims, characterized by, that the surface (1.4) of the clamping element (1.3) facing the inner wall of the winding core (1.1) is roughened. [5] Belt pulley (1) according to one of the preceding claims, characterized by , that the surface of the clamping element facing the inner wall of the winding core has barbs. [6] Belt pulley according to one of the preceding claims, characterized by , that the free end piece (1.3a) of the clamping element (1.3) is slightly bent to facilitate the threading of the roller shutter strap (1.7) into the clamping area between the inner wall of the winding core (1.1) and the clamping element (1.3).

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