Pre-tightening structure of a roller shutter

Abstract

The utility model relates to a roller shutter structure. A pre-tightening structure of a roller shutter, including reel, the reel is sleeved with the reel spring, the reel is equipped with the reel drum coaxial, the both ends of reel spring respectively with reel and reel drum rotation, the fixed stop piece is located on the reel, and the stop piece is located reel spring one side, and the side of stop piece is equipped with the adjusting part, and the adjusting part is fixed with reel drum, and the stop piece limits the end point of one side of adjusting part's axial movement. The utility model mainly provides a kind of pre-tightening structure of a roller shutter, which is simple in structure, can provide pre-tightening for the reel spring on the reel, and can be directly used after the roller shutter is installed;Solve the technical problem of time-consuming and laborious operation of reel and curtain cloth before the use of the existing technology in the roller shutter.

Description

Technical Field

[0001] This utility model relates to a roller blind structure, and more particularly to a pre-tensioning structure for a roller blind that does not require pulling ropes or other operations. Background Technology

[0002] One type of existing roller blind uses a beaded chain to wind the roller, and simultaneously uses the beaded chain to self-lock the roller at the desired position to fix the opening degree of the curtain. This type of roller blind requires force to pull the beaded chain during use, but this can easily cause the chain to break. Once the chain breaks, the roller blind can no longer be used. Furthermore, when the curtain is pulled down, the weight of the curtain exerts a certain torque on the roller, and during the self-locking process, the brake head constantly bears this torque, which can easily damage the brake head. This type of roller blind requires hanging a beaded chain or rope, which not only affects aesthetics but also poses a significant safety hazard as it can easily cause children to get tangled in it. Another type of roller blind is driven by a motor. The motor rotates, driving the roller, and simultaneously uses the motor shaft to limit the self-locking position of the roller. The weight of the curtain exerts a certain torque on the roller, and this torque acts entirely on the motor shaft, placing a huge load on the motor. There is also a cordless roller blind that allows the curtain to be manually raised or lowered to the desired position according to actual usage needs. This type of roller blind includes a coil spring, utilizing the roller blind's torque balance to achieve cordless operation. However, for this type of roller blind, it is often necessary to pre-tighten it after installation and before use. This means that the roller spring must first have sufficient torque to balance the curtain before it can maintain its self-locking without the need for ropes or other manual raising or lowering of the curtain. Summary of the Invention

[0003] This utility model mainly provides a pre-tensioning structure for roller blinds that is simple in structure and can provide pre-tensioning for the coil spring on the roller, so that the roller blind can be used directly after installation; it solves the technical problem that in the prior art, it is necessary to operate the roller and curtain to pre-tension before using the roller blind, which is time-consuming and laborious.

[0004] This utility model also provides a pre-tensioning structure for roller blinds that adjusts the pre-tensioning force of the spring according to the width of the roller blind, and is suitable for use with roller blinds of various specifications; it solves the technical problem that the pre-tensioning force cannot be adjusted in the prior art.

[0005] The purpose of this utility model is mainly achieved through the following solution: a pre-tightening structure for a roller blind, including a roller shaft, a spring sleeved on the roller shaft, a coaxial drum outside the roller shaft, the two ends of the spring rotating with the roller shaft and the drum respectively, a stop member fixed on the roller shaft, the stop member being located on one side of the spring, an adjusting member being provided on one side of the stop member, the adjusting member being fixed to the drum, and the stop member limiting the endpoint of one side of the axial movement of the adjusting member.

[0006] During pre-tensioning, the adjusting member and the stop member are first inserted into the drum. The adjusting member is now engaged with the stop member, which restricts further axial movement of the adjusting member, preventing further relative movement. Inserting the adjusting member into the drum positions it. Then, the inner ring of the drum, which fixes one end of the coil spring, is rotated to tighten the spring, giving it pre-tension. After tightening, when the inner ring of the coil spring, the shaft, the spring, the end support member at the first end, and the drum support member are placed into the drum, because the adjusting member is relatively fixed to the drum, and the stop member is fixed to the shaft, the drum will not move when the shaft is stationary. Therefore, the spring inside the drum is in a pre-tensioned state. When the curtain is operated, the adjusting member moves away from the stop member and follows the axial movement of the drum.

[0007] The adjusting component and the stop component are fixed to the drum and the roller shaft respectively. This ensures that the drum is fixed during pre-tensioning, and then, during operation, the stop component is fixed to the roller shaft while the adjusting component moves with the drum, guaranteeing relative movement between the adjusting component and the stop component. The structure is simple, and pre-tensioning is achieved before installation, facilitating the installation of the roller blind.

[0008] Preferably, the stop includes a stop plate and an adjusting rod, with the adjusting member sleeved on the adjusting rod and the stop plate located on one side of the adjusting rod. The stop plate forms an end face stop, restricting the axial movement stroke of the adjusting member.

[0009] Preferably, the adjusting rod is a screw, and the adjusting element is a nut threadedly connected to the adjusting rod. The screw and nut combination is structurally simple and ensures that the relative position of the adjusting element and the stop changes with the relative rotation of the drum and shaft. The screw provides the nut, which acts as the adjusting element, with sufficient travel space.

[0010] Preferably, the stop member has a stop groove on its end face facing the adjusting member, and a stop protrusion on its end face, with the stop groove and stop protrusion engaging. This prevents excessive movement of the adjusting member and ensures the relative position stability of the adjusting member and the stop member.

[0011] Preferably, a compression spring is provided between the stop and the adjusting member. This provides a gap between the stop and the adjusting member. When the preload is too high, the rotating drum moves the adjusting member further towards the stop, further compressing the compression spring. The rotation of the drum also causes the inner ring of the coil spring to rotate, thus loosening the coil spring by a few turns and reducing the preload.

[0012] Preferably, a smooth shaft is provided between the stop plate and the adjusting rod, and a compression spring is sleeved on the smooth shaft. One end of the compression spring abuts against the stop plate, and the other end of the compression spring is connected to the adjusting component. The compression spring is sleeved on the smooth shaft. When the rotating drum further compresses the compression spring, the adjusting component moves from the threaded section to the smooth shaft section. In this way, the rotation of the drum will not affect the adjusting component. The drum can rotate multiple times until the appropriate preload is reached. At this time, the adjusting component will not move axially. After the preload is adjusted, the elastic force of the compression spring pushes the adjusting component against the threaded rod section, and the threaded connection is made again to position the adjusting component.

[0013] Preferably, the stop member has a shaped hole at its center, and the spool is inserted into the shaped hole at the center of the stop member. The cross-section of the spool has the same shape as the shaped hole. This ensures synchronous rotation of the spool and the stop member.

[0014] Preferably, the outer circumferential surface of the adjusting component is provided with evenly distributed support ribs. The interference fit between the support ribs and the inner wall of the drum ensures the synchronous rotation of the adjusting component and the drum, and the design of the support ribs also facilitates the installation of the adjusting component.

[0015] Therefore, the pre-tightening structure of the roller blind of this utility model has the following advantages: the roller is fixed by adjusting the roller, and then the stop is fixed to the roller shaft. The stop controls the axial movement endpoint of the adjusting part, thereby stopping the unidirectional rotation of the roller. It can quickly pre-tighten the roller spring. The structure is simple and makes the roller blind easy to install. Attached Figure Description

[0016] Figure 1 This is an exploded view of a structure according to Embodiment 1 of this utility model;

[0017] Figure 2 It is a 3D view of the adjusting component;

[0018] Figure 3 This is a 3D view of the stop component.

[0019] Figure 4 This is an exploded view of a structure according to Embodiment 2 of this utility model. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0021] Example 1:

[0022] like Figure 1 and 2 As shown, a pre-tensioning structure for a roller blind is provided. The roller blind structure includes a roller drum 1, a roller shaft 5 installed at the center of the roller drum 1, and cylindrical roller support members 2 inserted into both ends of the roller drum 1. End support members are installed inside the roller support members.

[0023] A coil spring 3 is sleeved on the spool 5. One end of the coil spring 3 is fixed to the end support 6 at the first end, and the other end of the coil spring 3 is fixed to the inner ring 4 of the drum. The inner ring 4 is sleeved on the spool 5, but does not rotate synchronously with the spool 5. The outer circumferential surface of the inner ring 4 is formed with raised ribs. The raised ribs are press-fitted with the inner wall of the drum 1 to ensure that the inner ring 4 rotates synchronously with the drum 1.

[0024] A stop and an adjusting component are installed on the reel, located on one side of the inner ring of the drum. The stop is fixed to the reel 5, and the adjusting component is fixed to the drum.

[0025] like Figure 2 As shown, the adjusting member 26 is cylindrical, with evenly distributed raised ribs 29 formed on its outer circumference. The raised ribs 29 are press-fitted with the inner wall of the drum 1, ensuring that the adjusting member 26 rotates synchronously with the drum 1. A through hole is formed at the center of the adjusting member, and a thread 28 is formed at one end of the through hole. A wedge-shaped fixing protrusion 27 is formed on the end face of the adjusting member.

[0026] like Figure 3 As shown, the stop 25 includes a stop plate 30 and a screw 33 integrally formed with the stop plate 30. The screw 33 passes through the through hole of the adjusting member 26, and the adjusting member 26 is threadedly connected to the screw 33. A shaped hole, as shown in the figure, is formed in the center of the stop 25. A spool 5 is inserted into the shaped hole to ensure that the spool 5 and the stop 25 rotate synchronously. A radial fixing hole 31 is formed on the stop plate 30, and the stop 25 is fixed to the spool 5 by screws. A groove 34 is formed on the end face of the stop plate 30. The groove 34 cooperates with the fixing protrusion 27 on the adjusting member. When the adjusting member 26 moves onto the stop 25, the relative position of the two is fixed by the cooperation of the groove 34 and the fixing protrusion 27, ensuring that the adjusting member 26 can no longer rotate.

[0027] When installing the roller 5 into the drum 1, first align the adjusting piece with the groove and fixing protrusion of the stop plate, and fix them relative to each other. Then, place it into the drum 1, rotate the inner ring 4 of the drum to pre-tighten the coil spring 3, and after pre-tightening, place the roller 5, the end support 6 at the first end, and the drum support 2 into the drum 1. Then, install the roller blind onto the window frame. Then, pull the blind up and down. When the blind rises to the top, the nut also abuts against the stop plate, at which point the coil spring has pre-tightening force. The drum will not continue to rotate due to the coil spring.

[0028] Example 2:

[0029] like Figure 4As shown, unlike Embodiment 1, the section between the stop plate and the screw is a light shaft 32, and a compression spring 37 is sleeved on the light shaft 32. One end of the compression spring 37 abuts against the adjusting member 26, and the other end of the compression spring 37 abuts against the stop plate 30.

[0030] When the roller blind is too wide, the user can manually cut off the excess length of the roller and fabric. In this case, the preload provided by the spring inside the roller is no longer suitable for the cut blind structure, requiring manual adjustment of the preload. At this point, the nut is held in place by the compressed spring and will not rotate; therefore, the roller cannot move. To adjust the spring preload, the roller can be manually rotated, causing the nut to compress the spring. This moves the nut from the threaded section to the smooth shaft section, where it is no longer constrained, allowing the spring preload to be adjusted. After adjustment, the roller is rotated in the opposite direction, returning the nut to the threaded rod and limiting the next movement of the roller.

[0031] The specific embodiments described herein are merely illustrative of the concept of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A pre-tensioning structure for a roller blind, comprising a roller shaft, a coil spring sleeved on the roller shaft, and a coaxial drum outside the roller shaft, wherein the two ends of the coil spring rotate with the roller shaft and the drum respectively, characterized in that: A stop is fixed on the reel, the stop is located on one side of the coil spring, and an adjusting member is provided on one side of the stop. The adjusting member is fixed to the reel, and the stop limits the end point of one side of the axial movement of the adjusting member.

2. The pre-tensioning structure of a roller blind according to claim 1, characterized in that: The stop component includes a stop plate and an adjusting rod. The adjusting component is sleeved on the adjusting rod, and the stop plate is located on one side of the adjusting rod.

3. The pre-tensioning structure of a roller blind according to claim 2, characterized in that: The adjusting rod is a screw, and the adjusting component is a nut that is threadedly connected to the adjusting rod.

4. The pre-tensioning structure of a roller blind according to claim 1, 2, or 3, characterized in that: The stop member has a stop groove on the end face facing the adjustment member, and a stop protrusion on the end face of the adjustment member, with the stop groove and the stop protrusion cooperating.

5. The pre-tensioning structure of a roller blind according to claim 1, characterized in that: A compression spring is provided between the stop and the adjusting member.

6. The pre-tensioning structure of a roller blind according to claim 2, characterized in that: A light shaft is provided between the stop plate and the adjusting rod. A compression spring is sleeved on the light shaft. One end of the compression spring abuts against the stop plate, and the other end of the compression spring is connected to the adjusting component.

7. A pre-tensioning structure for a roller blind according to claim 1, 2, 3, 5, or 6, characterized in that: The stop member has a shaped hole at its center, and the spool is inserted into the shaped hole at the center of the stop member. The cross-section of the spool is the same as the shape of the shaped hole.

8. The pre-tensioning structure of a roller blind according to claim 7, characterized in that: The outer circumferential surface of the adjusting component is provided with evenly distributed support ribs.

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