A transmission mechanism and shutter with variable extension and retraction travel

Abstract

This utility model relates to the field of venetian blind technology, and more particularly to a transmission mechanism and venetian blind with adjustable retraction stroke. The transmission mechanism includes a rotating shaft, an upper synchronous pulley, a synchronous belt, and an inner control. The upper synchronous pulley is rotatably positioned within the frame and located at the top. The synchronous belt meshes with the upper synchronous pulley and is connected to the inner control. One end of the rotating shaft is drivenly connected to the upper synchronous pulley, and the other end is drivenly connected to the venetian blind's cord winder. The upper synchronous pulley includes a large-diameter synchronous pulley and a small-diameter synchronous pulley connected to each other. The centers of the large-diameter and small-diameter synchronous pulleys are coaxial. The synchronous belt can selectively engage with either the large-diameter or small-diameter synchronous pulley. This utility model allows for flexible adjustment of the outer control stroke by simply adjusting the meshing state of the synchronous belt with either the large-diameter or small-diameter synchronous pulley, thereby achieving adjustable retraction stroke and improving the flexibility and adaptability of the venetian blind.

Description

Technical Field

[0001] This utility model relates to the field of louver technology, specifically to a transmission mechanism and louver with adjustable retraction stroke. Background Technology

[0002] Venetian blinds are windows consisting of two panes of glass (inner and outer glass, also known as front and back glass) facing each other and sealed at all four edges, with adjustable slats installed inside. They fall under the category of sun-shading insulated glass windows. Venetian blinds have two control methods: single-control and dual-control. Single-control uses one outer controller and one inner controller to operate the blinds, controlling both the slat rotation and the raising / lowering of the blinds. Dual-control uses two inner controllers and two outer controllers to control the slat rotation and the raising / lowering of the blinds, respectively.

[0003] In related technologies, application number CN201220344250.3 discloses a built-in sunshade device for insulating glass, including a rope winding mechanism, a transmission mechanism for controlling the rotation of the rope winding mechanism, and a sunshade mechanism connected to the rope winding mechanism. The rope winding mechanism includes a rope winding shaft, a set of rope winding pushers mounted on the rope winding shaft, a transmission mechanism connected to the rope winding shaft, and a sunshade mechanism connected to the rope winding pushers. This utility model uses a single rope winding shaft, which can wind multiple pull ropes to make the sunshade mechanism retract and extend in a balanced manner; the single rope winding shaft does not need to move left or right, the structure is simple, and the assembly efficiency is high. However, in the above technology, the radius of the upper pulley is fixed, which makes it impossible to adjust the extension and retraction stroke of the external controller according to actual needs, resulting in a poor user experience. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the purpose of this utility model is to provide a transmission mechanism and louvers with adjustable retraction stroke. Users can adjust the meshing state of the synchronous belt with the large-diameter or small-diameter synchronous pulley through simple operation according to actual needs, thereby achieving flexible adjustment of the external controller stroke, realizing the adjustability of the retraction stroke, and improving the flexibility and adaptability of the louvers.

[0005] The first aspect of this utility model provides a transmission mechanism with adjustable retraction stroke, applied to a venetian blind, the venetian blind including a frame and a cord winder; the transmission mechanism includes a rotating shaft, an upper synchronous pulley, a synchronous belt with a rack and pinion, and an inner control device;

[0006] The upper synchronous pulley is rotatably positioned within the frame and located at the top. The synchronous belt meshes with the upper synchronous pulley and is connected to the inner control device. The inner control device is slidably mounted inside the frame.

[0007] One end of the rotating shaft is connected to the upper synchronous belt pulley for transmission, and the other end is used for transmission connection with the cord winder of the louver.

[0008] The upper synchronous pulley includes a large-diameter synchronous pulley and a small-diameter synchronous pulley connected to each other. The centers of the large-diameter synchronous pulley and the small-diameter synchronous pulley are coaxial. The synchronous belt can selectively cooperate with either the large-diameter synchronous pulley or the small-diameter synchronous pulley.

[0009] In a preferred embodiment of the first aspect of this utility model, an external controller is further included, which is used to magnetically connect to the internal controller on the outer side wall of the frame.

[0010] In a preferred embodiment of the first aspect of this utility model, a lower synchronous pulley is further included. The lower synchronous pulley is rotatably positioned within the frame. The synchronous belt meshes with both the upper and lower synchronous pulleys. Both ends of the synchronous belt are connected to both ends of the inner controller to form a closed loop.

[0011] In a preferred embodiment of the first aspect of this utility model, a lower rotating wheel and a connecting rope are further included. The lower rotating wheel is rotatably positioned within the frame. One end of the timing belt is connected to one end of the connecting rope. The connecting rope passes around the lower rotating wheel and is connected to the lower end of the inner controller. The upper end of the inner controller is connected to the other end of the timing belt, thereby forming a closed loop.

[0012] In a preferred embodiment of the first aspect of this utility model, the large-diameter synchronous pulley and the small-diameter synchronous pulley are integrally formed.

[0013] In a first aspect of this utility model, as a preferred embodiment, the ratio of the radii of the large-diameter synchronous pulley to the small-diameter synchronous pulley is (1.2-2):1.

[0014] In a first aspect of this utility model, as a preferred embodiment, an annular baffle extends radially outward from the connection between the large-diameter synchronous pulley and the small-diameter synchronous pulley.

[0015] In a preferred embodiment of the first aspect of this utility model, a limiting component is further included. The limiting component includes a transverse mounting rod and a roller. The transverse mounting rod is installed inside the frame and located above the upper synchronous pulley. The roller is rotatably mounted on the transverse mounting rod and is located on one side of the small-diameter synchronous pulley. The roller can form a rotational contact with the synchronous belt meshing on the small-diameter synchronous pulley to limit the radial movement of the synchronous belt along the small-diameter synchronous pulley.

[0016] The second aspect of this utility model is a louver, including the transmission mechanism of the first aspect of this utility model.

[0017] In a second aspect of this utility model, as a preferred embodiment, the venetian blind further includes a frame having a venetian blind cavity in the middle, a venetian blind disposed in the venetian blind cavity of the frame, and two rope rollers, wherein the venetian blind is connected to the two rope rollers respectively, and the two rope rollers are connected to a rotating shaft respectively.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. The upper synchronous belt pulley of this utility model includes a large-diameter synchronous belt pulley and a small-diameter synchronous belt pulley connected to each other. The centers of the large-diameter synchronous belt pulley and the small-diameter synchronous belt pulley are coaxial. The synchronous belt can selectively engage with either the large-diameter synchronous belt pulley or the small-diameter synchronous belt pulley. In practical applications, the inner controller needs to cooperate with the outer controller. When the synchronous belt engages with the large-diameter synchronous belt pulley, due to the larger radius of the large-diameter synchronous belt pulley, the synchronous belt needs to move a longer distance to complete one full rotation. This means that the outer controller needs to travel a longer distance to drive the rope winder to complete one full lifting and lowering action. Conversely, when the synchronous belt engages with the small-diameter synchronous belt pulley, due to the smaller radius of the small-diameter synchronous belt pulley, the synchronous belt needs to move a shorter distance to complete one full rotation. Users can adjust the meshing state of the synchronous belt with the large-diameter or small-diameter synchronous belt pulley through simple operation according to actual needs, thereby achieving flexible adjustment of the outer controller's stroke. In this way, the transmission mechanism achieves adjustable retraction stroke, improving the flexibility and adaptability of the louvers.

[0020] 2. In this utility model, an annular baffle extends radially outward at the connection between the large-diameter and small-diameter synchronous pulleys. During high-speed operation, the synchronous belt may detach from the large-diameter pulley due to vibration, impact, or uneven tension. The baffle effectively prevents the synchronous belt from deviating axially from its normal path, reducing the risk of detachment. In some cases, such as severe wear of the synchronous belt, excessive gear clearance, or the presence of foreign objects, the synchronous belt may jam at the large-diameter pulley, leading to transmission failure. The presence of the baffle reduces the occurrence of such situations and protects the transmission mechanism from damage.

[0021] 3. This utility model also includes a limiting component, which comprises a transverse mounting rod and a roller. When the synchronous belt is tightly engaged with the small-diameter synchronous pulley, the roller forms a tight rotational contact with the synchronous belt. This contact method effectively restricts the radial movement of the synchronous belt along the small-diameter synchronous pulley, thereby ensuring the stability and accuracy of the synchronous belt during transmission. The roller is designed to rotate freely on the transverse mounting rod. When the synchronous belt runs on the small-diameter synchronous pulley, the roller rotates accordingly. This rotational motion not only reduces the friction between the synchronous belt and the roller but also further enhances the smoothness and stability of the transmission. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the louver of this utility model;

[0023] Figure 2 for Figure 1 An enlarged structural diagram of part A in the diagram;

[0024] Figure 3 This is a structural schematic diagram of the louver of this utility model from another angle;

[0025] Figure 4 This is a partial structural diagram of the louver of this utility model.

[0026] In the diagram: 100, transmission mechanism; 110, rotating shaft; 120, upper synchronous belt pulley; 121, large-diameter synchronous belt pulley; 122, small-diameter synchronous belt pulley; 123, annular baffle; 130, lower synchronous belt pulley; 140, synchronous belt; 150, internal control; 160, limit assembly; 161, transverse mounting rod; 162, roller; 200, frame; 300, venetian blind; 400, rope winder. Detailed Implementation

[0027] The utility model will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0028] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0031] Example 1:

[0032] Please refer to Figure 1-4 As shown, this embodiment provides a transmission mechanism 100 with adjustable retraction stroke, applied to a venetian blind. The venetian blind includes a frame 200 and a cord winder 400. The transmission mechanism 100 includes a rotating shaft 110, an upper synchronous pulley 120, a synchronous belt with a rack and pinion 140, and an inner control 150.

[0033] The upper timing pulley 120 is rotatably positioned inside the frame 200 and located at the top. The timing belt 140 meshes with the upper timing pulley 120 and is connected to the inner controller 150. The inner controller 150 is used to be slidably installed inside the frame 200.

[0034] One end of the rotating shaft 110 is connected to the upper synchronous belt pulley 120 for transmission, and the other end is used for transmission connection with the louver rope winder 400.

[0035] The upper synchronous pulley 120 includes a large-diameter synchronous pulley 121 and a small-diameter synchronous pulley 122 connected to each other. The centers of the large-diameter synchronous pulley 121 and the small-diameter synchronous pulley 122 are coaxial. The synchronous belt 140 can selectively cooperate with either the large-diameter synchronous pulley 121 or the small-diameter synchronous pulley 122.

[0036] Based on the above structure, in practical applications, the inner controller 150 needs to cooperate with the outer controller. When the synchronous belt 140 is engaged with the large-diameter synchronous pulley 121, due to the larger radius of the large-diameter synchronous pulley 121, the synchronous belt 140 needs to move a relatively long distance to complete one full rotation. This means that the outer controller needs to travel a relatively long distance to drive the rope reel 400 to complete one full lifting and lowering action. Conversely, when the synchronous belt 140 is engaged with the small-diameter synchronous pulley 122, due to the smaller radius of the small-diameter synchronous pulley 122, the synchronous belt 140 needs to move a shorter distance to complete one full rotation. Users can adjust the meshing state of the synchronous belt 140 with the large-diameter synchronous pulley 121 or the small-diameter synchronous pulley 122 through simple operation according to actual needs, thereby achieving flexible adjustment of the outer controller's stroke. In this way, the transmission mechanism 100 achieves adjustable retraction stroke, improving the flexibility and adaptability of the louver.

[0037] In a preferred embodiment of this invention, an external controller is further included, which is used to magnetically connect the external controller 150 to the outer side wall of the frame 200. This magnetic connection between the external controller and the inner controller 150 allows the external controller to be easily attached to the outer side wall of the frame 200, and also makes it convenient for the user to remove and operate it at any time.

[0038] In a preferred embodiment of the present invention, a lower synchronous pulley 130 is further included. The lower synchronous pulley 130 is rotatably positioned within the frame 200. The synchronous belt 140 is engaged with the upper synchronous pulley 120 and the lower synchronous pulley 130 respectively. The two ends of the synchronous belt 140 are connected to the two ends of the inner controller 150 respectively to form a closed loop.

[0039] As an alternative, the lower timing pulley 130 can be replaced with a lower rotating pulley and a connecting rope. The lower rotating pulley is rotatably positioned within the frame 200. One end of the timing belt 140 is connected to one end of the connecting rope. The connecting rope passes around the lower rotating pulley and is connected to the lower end of the inner controller 150. The upper end of the inner controller 150 is connected to the other end of the timing belt 140, thus forming a closed loop.

[0040] In a preferred embodiment of this utility model, the large-diameter synchronous pulley 121 and the small-diameter synchronous pulley 122 are integrally formed.

[0041] Based on the above structure, the one-piece molded large-diameter synchronous pulley 121 and small-diameter synchronous pulley 122 share the same shaft and axis of rotation, which enables them to maintain synchronization and stability during rotation. This design reduces energy loss and friction during transmission, improving transmission efficiency. At the same time, the one-piece structure also makes the transmission mechanism 100 easier to install and maintain.

[0042] In a preferred embodiment of this utility model, the ratio of the radii of the large-diameter synchronous pulley 121 to the small-diameter synchronous pulley 122 is (1.2-2):1.

[0043] In a preferred embodiment of the present invention, an annular baffle 123 extends radially outward from the connection between the large-diameter synchronous pulley 121 and the small-diameter synchronous pulley 122.

[0044] Based on the above structure, during high-speed operation, the synchronous belt 140 may detach from the large-diameter synchronous pulley 121 due to vibration, impact, or uneven tension. The baffle design can effectively prevent the synchronous belt 140 from deviating from its normal axial path, reducing the risk of detachment. In some cases, such as when the synchronous belt 140 is severely worn, the gear clearance is too large, or there are foreign objects, the synchronous belt 140 may jam at the large-diameter synchronous pulley 121, leading to transmission failure. The presence of the baffle can reduce the occurrence of such situations and protect the transmission mechanism 100 from damage.

[0045] In a preferred embodiment of the present invention, a limiting component 160 is further included. The limiting component 160 includes a transverse mounting rod 161 and a roller 162. The transverse mounting rod 161 is installed inside the frame 200 and located above the upper synchronous pulley 120. The roller 162 is rotatably mounted on the transverse mounting rod 161 and is located on one side of the small-diameter synchronous pulley 122. The roller 162 can form a rotational contact with the synchronous belt 140 meshing on the small-diameter synchronous pulley 122 to limit the radial movement of the synchronous belt 140 along the small-diameter synchronous pulley 122.

[0046] Based on the above structure, when the synchronous belt 140 is tightly engaged with the small-diameter synchronous pulley 122, the roller 162 will form a tight rotational contact with the synchronous belt 140. This contact method effectively restricts the radial movement of the synchronous belt 140 along the small-diameter synchronous pulley 122, thereby ensuring the stability and accuracy of the synchronous belt 140 during transmission. The roller 162 is designed to rotate freely on the transverse mounting rod 161. When the synchronous belt 140 runs on the small-diameter synchronous pulley 122, the roller 162 will rotate accordingly. This rotational motion not only reduces the friction between the synchronous belt 140 and the roller 162, but also further enhances the smoothness and stability of the transmission.

[0047] Example 2:

[0048] Please refer to Figure 1-4 As shown, this embodiment provides a second aspect of the present invention: a Venetian blind, including the transmission mechanism 100 of embodiment 1. The Venetian blind also includes a frame 200 with a Venetian blind cavity in the middle, a Venetian blind 300 disposed in the Venetian blind cavity of the frame 200, and two cord winders 400. The Venetian blind 300 is connected to the two cord winders 400 respectively, and the two cord winders 400 are connected to a rotating shaft 110 respectively.

[0049] Although only certain components and embodiments of this application have been illustrated and described, many modifications and alterations will be apparent to those skilled in the art without actually departing from the scope and spirit of the claims, such as variations in the size, dimensions, structure, shape and proportion of the various elements, installation arrangement, material use, color, orientation, etc.

[0050] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A transmission mechanism with adjustable retraction stroke, applied to a venetian blind, the venetian blind comprising a frame and a cord winder; characterized in that, The transmission mechanism includes a rotating shaft, an upper synchronous pulley, a synchronous belt with a rack and pinion, and an internal control unit; The upper synchronous pulley is rotatably positioned within the frame and located at the top. The synchronous belt meshes with the upper synchronous pulley and is connected to the inner control device. The inner control device is slidably mounted inside the frame. One end of the rotating shaft is connected to the upper synchronous belt pulley for transmission, and the other end is used for transmission connection with the rope winder of the louver. The upper synchronous pulley includes a large-diameter synchronous pulley and a small-diameter synchronous pulley connected to each other. The centers of the large-diameter synchronous pulley and the small-diameter synchronous pulley are coaxial. The synchronous belt can selectively cooperate with either the large-diameter synchronous pulley or the small-diameter synchronous pulley.

2. The transmission mechanism with adjustable extension / retraction stroke as described in claim 1, characterized in that, It also includes an external controller, which is used to magnetically connect to the internal controller on the outer side wall of the frame.

3. The transmission mechanism with adjustable extension / retraction stroke as described in claim 1, characterized in that, It also includes a lower synchronous pulley, which is rotatably positioned within the frame. The synchronous belt meshes with both the upper and lower synchronous pulleys, and both ends of the synchronous belt are connected to the two ends of the inner controller to form a closed loop.

4. The transmission mechanism with adjustable extension / retraction stroke as described in claim 1, characterized in that, It also includes a lower rotating wheel and a connecting rope. The lower rotating wheel is rotatably positioned within the frame. One end of the timing belt is connected to one end of the connecting rope. The connecting rope passes around the lower rotating wheel and is connected to the lower end of the inner controller. The upper end of the inner controller is connected to the other end of the timing belt, thereby forming a closed loop.

5. The transmission mechanism with adjustable extension / retraction stroke as described in claim 1, characterized in that, The large-diameter synchronous pulley and the small-diameter synchronous pulley are integrally formed.

6. The transmission mechanism with adjustable extension / retraction stroke as described in claim 5, characterized in that, The ratio of the radii of the large-diameter synchronous pulley to the small-diameter synchronous pulley is (1.2-2):

1.

7. The transmission mechanism with adjustable extension / retraction stroke as described in claim 6, characterized in that, An annular baffle extends radially outward from the connection point between the large-diameter synchronous pulley and the small-diameter synchronous pulley.

8. The transmission mechanism with adjustable extension / retraction stroke as described in claim 7, characterized in that, It also includes a limiting component, which includes a transverse mounting rod and a roller. The transverse mounting rod is installed inside the frame and located above the upper synchronous pulley. The roller is rotatably mounted on the transverse mounting rod and is located on one side of the small-diameter synchronous pulley. The roller can form a rotational contact with the synchronous belt meshing on the small-diameter synchronous pulley to limit the radial movement of the synchronous belt along the small-diameter synchronous pulley.

9. A type of venetian blind, characterized in that, Includes the transmission mechanism with adjustable retraction stroke as described in any one of claims 1-8.

10. The venetian blind as described in claim 9, characterized in that, The venetian blind also includes a frame with a venetian blind cavity in the middle, a venetian blind set in the venetian blind cavity of the frame, and two rope rollers. The venetian blind is connected to the two rope rollers respectively, and the two rope rollers are connected to the rotating shaft respectively.

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