belt pulley
The novel belt pulley with a clamping element and clamping levers addresses the issue of material fatigue in conventional pulleys, ensuring reliable operation and reducing repair costs by securely holding the belt end piece.
Patent Information
- Application Number
- DE202025003442
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-11-12
- Publication Date
- 2026-01-22
- Estimated Expiration
- 2035-11-30
AI Technical Summary
Conventional belt pulleys in roller shutters suffer from material fatigue, leading to the breakage of the protruding section, which results in the loss of the positive connection between the belt and pulley, necessitating costly replacements.
A novel belt pulley design featuring a clamping element with clamping levers and a slot in the winding core to securely hold the belt end piece, using barbs for enhanced grip, ensuring a reliable connection even after prolonged use.
The new design prevents the breakage of the protruding section, maintaining the operational integrity of the roller shutter without the need for frequent replacements, thereby reducing repair costs.
Smart Images
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Abstract
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 creates a novel belt pulley that functions reliably even after long operating times of the roller shutter, thus avoiding high repair costs.
[0004] An embodiment of the invention is explained in more detail below with reference to the drawing. The drawing shows... Fig. 1: A schematic representation of a roller shutter belt pulley Fig. 2: a cut through the belt pulley Fig. 3: A section through the winding core of the belt pulley in enlarged view Fig. 4: A side view of a clamping lever
[0005] 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. 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 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 is inserted into the interior of the winding core 1.1. Fig. 2) and can be clamped by the clamping element. The clamping element consists of two cooperating clamping levers 1.8a and 1.8b. The first clamping lever 1.8a is rotatably connected to the pivot point 1.9a in the area of the slot 1.5. The second clamping lever 1.8b is rotatably connected to the pivot point 1.9b in the area of the slot. A force, indicated by arrows P1 and P2, is exerted on each of the clamping levers 1.8a and 1.8b, causing them to move towards each other and clamp a roller shutter strap 1.7 inserted between them. The force acting on the clamping levers 1.8a and 1.8b can preferably be exerted by compression springs, which are not explicitly shown in the figure.
[0006] As in Fig.As shown in Figure 4, the holding force of the clamping levers 1.8a, 1.8b can be advantageously increased by providing at least section of their surface facing the roller shutter strap 1.7 with barbs 1.8c. To fasten the roller shutter strap 1.7, its end piece is inserted through the slot 1.5 into the winding core and pushed between the clamping levers 1.8a, 1.8b with slight pressure. 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 1.8a Clamping lever 1.8b Clamping lever 1.8c Barb 1.9a Pivot point 1.9b Pivot point P1 Arrow P2 arrow
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 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 comprises two clamping levers (1.8a, 1.8b) which are rotatably hinged to the slot (1.5) of the winding core (1.1) and project into it. [3] Belt pulley according to one of the preceding claims, characterized by , that the outer surfaces of the clamping levers (1.8a, 1.8b) facing the roller shutter strap (1.7) are provided with barbs (1.8c) in sections.