Push-pull coil spring

Abstract

The push-pull coil spring comprises a fixed shaft used for being fixed to a wall, a ratchet mechanism installed on the fixed shaft and at least one coil spring mechanism connected to the ratchet mechanism, the coil spring mechanism comprises a rotating seat and a coil spring matched in the rotating seat, the rotating seat is connected with a roller shutter, and the coil spring is connected with the ratchet mechanism. When the elastic force provided by the coil spring cannot balance the weight of the roller shutter, the ratchet mechanism can be rotated to drive the coil spring to rotate relative to the rotating seat so as to perform pre-tightening in advance, so that the elastic force provided by the coil spring can always balance the roller shutter, and the structure can adaptively adjust the elastic force of the coil spring; according to the roller shutter, the pre-tightening force of the coil spring can be adjusted even if the weight of the roller shutter is changed, the application range is wider, the structure is simpler, the adjustment is more convenient, the coil spring does not need to be replaced after the roller shutter is used for a long time, only the coil spring needs to be further pre-tightened, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of cordless curtain pulling technology, and particularly relates to a push-pull coil spring. Background Art

[0002] Traditional curtains usually use drawstrings to control the raising and lowering of the curtains. However, the presence of drawstrings not only affects the aesthetics but also may pose safety hazards to children and pets. According to relevant statistics, incidents of children suffocating and getting injured due to curtain drawstrings occur from time to time. Therefore, the design and application of cordless curtains are particularly important.

[0003] The core of a cordless curtain lies in realizing the free retraction and suspension of the curtain through a certain mechanical device, and the push-pull coil spring is a key component of this mechanical device. Theoretically, the push-pull coil spring has certain elastic characteristics, and its own elastic force will increase as the weight of the curtain increases when it is pulled down, so as to achieve relative balance, thereby realizing the effect of suspension anywhere. Referring to a balance force assembly of a cordless curtain disclosed in a Chinese utility model patent with the patent application number 201922411348.0, it includes a coil spring guard, a coil spring shaft and a spring. The coil spring guard includes an end portion, two reinforcing ribs and a fixing disc. One end of each of the two reinforcing ribs is fixedly connected to the end portion, and the two reinforcing ribs are arranged correspondingly. A plurality of fixing discs are arranged at equal intervals between the two reinforcing ribs, and a through hole is opened at the center of the fixing disc; the spring is in a scroll shape, and an installation hole is opened at one end of its inner center, and an arc-shaped buckle is bent at the outer end. According to the length of the curtain pulled down, the spring can automatically balance the elastic force so that the elastic force cancels out the weight of the pulled-out part of the curtain, enabling it to stably and reliably output torque outward to achieve the purpose of fixing the curtain length. At the same time, according to curtains of different weights, the installation quantity of the spring can be adjusted so that the torque formed by multiple springs can be adapted to the curtain weight.

[0004] However, in the above structure, it can only balance the weight of the rolling curtain by changing the number of coil springs, and cannot adjust the elastic force of the coil spring. Therefore, in actual application scenarios, due to the change in the size of the curtain and external factors, even if the number of coil springs is changed, it is still difficult to balance with the curtain weight. Therefore, when installing, it is necessary to use other tools to adjust the coil spring and then install it. Moreover, such adjustment is prone to errors and cannot be accurately adjusted, and multiple attempts are required, which greatly increases the complexity and installation difficulty.

[0005] In addition, after long-term use, the elastic force of the coil spring will decrease, so it is necessary to frequently replace the coil spring to ensure the normal use of the curtain, which also increases the disassembly and assembly difficulty and the use cost. Summary of the Utility Model

[0006] In order to overcome the deficiencies of the prior art, the utility model provides a push-pull coil spring.

[0007] The technical solution adopted by the present utility model to solve its technical problems is as follows:

[0008] A push-pull coil spring, comprising a fixed shaft for fixing on a wall, a ratchet mechanism mounted on the fixed shaft, and at least one coil spring mechanism connected to the ratchet mechanism. The coil spring mechanism includes a rotating seat and a coil spring fitted inside the rotating seat. The rotating seat is connected to a rolling curtain, the coil spring is connected to the ratchet mechanism, and the ratchet mechanism drives the coil spring to rotate relative to the rotating seat to adjust the pre-tightening force.

[0009] In the present utility model, the ratchet mechanism includes an adjusting sleeve, a ratchet rotor, and a return spring. The adjusting sleeve is provided with a rotating cavity, the return spring is located in the rotating cavity, and the inner side of the rotating cavity is also provided with a plurality of axially extending clamping grooves. The ratchet rotor is axially slidably fitted in the clamping grooves and abuts against the return spring. The fixed shaft extends into the rotating cavity and cooperates with the ratchet rotor. A one-way sliding tooth is provided between the fixed shaft and the ratchet rotor, and the return spring urges the tooth on the ratchet rotor to abut against the tooth on the fixed shaft.

[0010] Further, one end of the adjusting sleeve is also provided with a rotating shaft parallel to the axis. One end of the rotating shaft is sleeved with a connecting sleeve, and the rotating shaft is connected to the adjusting sleeve through the connecting sleeve.

[0011] Further, one end of the adjusting sleeve close to the fixed shaft is provided with a rotating disc, and the outer edge of the rotating disc is provided with tooth grooves for increasing friction.

[0012] Further, a rotating shaft sleeve is rotatably fitted on the outer side of the adjusting sleeve, and the rotating shaft sleeve rotates with the rolling curtain together with the rotating seat.

[0013] In the present utility model, the rotating seat includes a seat body, a cover plate, and a scroll. The coil spring is located inside the seat body and is covered by the cover plate. The scroll is located at the center of the seat body and its two ends are rotatably abutted between the cover plate and the seat body. The inner end of the coil spring is connected to the scroll, and the outer end of the coil spring is connected to the seat body. The ratchet mechanism drives the scroll to contract the coil spring.

[0014] Further, the seat body extends to one side with a buckle, and a buckle groove is provided on the cover plate corresponding to the position of the buckle. When multiple coil spring mechanisms are provided, adjacent two coil spring mechanisms are clamped and connected through the cooperation of the buckle and the buckle groove.

[0015] The present utility model has the following advantages and beneficial effects:

[0016] A ratchet mechanism and a coil spring mechanism are arranged on a fixed shaft. When the elastic force provided by the coil spring cannot balance the weight of the rolling curtain, the ratchet mechanism can be rotated to drive the coil spring to rotate relative to the rotating seat for pre-tightening in advance, so that the elastic force provided by the coil spring can always balance the rolling curtain. Therefore, this structure can adaptively adjust the elastic force of the coil spring to be applicable to rolling curtains of various different specifications. Even if the weight of the rolling curtain is changed, it can be adjusted by adjusting the pre-tightening force of the coil spring. The application range is wider, the structure is simpler, the adjustment is more convenient, and the coil spring does not need to be replaced after long-term use. Only further pre-tightening the coil spring is required, which improves the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0018] Figure 1 Schematic diagram of arranging multiple coil spring mechanisms for the push-pull coil spring in this embodiment;

[0019] Figure 2 Exploded view of the ratchet mechanism in this embodiment;

[0020] Figure 3 Exploded view of the coil spring mechanism in this embodiment;

[0021] Figure 4 Schematic diagram of the cooperation between the adjusting bushing and the ratchet rotor in this embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. The present utility model is not limited to the following embodiments.

[0023] It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0024] In addition, if the description in the embodiments of the present utility model involves "first" or "second", etc., the description of "first" or "second", etc. is only for descriptive purposes and cannot be construed as indicating or implying its relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments may be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0025] As Figures 1 to 4 shown, this embodiment discloses a push-pull coil spring, which includes a fixed shaft 1 for fixing on a wall, a ratchet mechanism 2 installed on the fixed shaft 1, and at least one coil spring mechanism 3 connected to the ratchet mechanism 2. The coil spring mechanism 3 includes a rotating seat 31 and a coil spring 32 fitted inside the rotating seat 31. The rotating seat 31 is connected to the rolling curtain, and the coil spring 32 is connected to the ratchet mechanism 2. When the rolling curtain is pulled, the rotating seat 31 is driven to rotate to one side by the rolling curtain. At this time, the ratchet mechanism 2 is locked, and the coil spring 32 contracts in cooperation with the locked ratchet mechanism 2 to provide an elastic force for balancing the weight of the pulled-out part of the rolling curtain. When the elastic force provided by the coil spring 32 cannot balance the weight of the rolling curtain, the ratchet mechanism 2 can be rotated to the other side to drive the coil spring 32 to rotate relative to the rotating seat 31 for pre-tightening in advance, so that the elastic force provided by the coil spring 32 can always balance the rolling curtain. Therefore, this structure can adaptively adjust the elastic force of the coil spring 32 to be applicable to rolling curtains of various different specifications. Even if the weight of the rolling curtain is changed, it can be adjusted by adjusting the pre-tightening force of the coil spring 32. The application range is wider, the structure is simpler, the adjustment is more convenient, and the coil spring 32 does not need to be replaced after long-term use. Only the coil spring 32 needs to be further pre-tightened, which improves the service life.

[0026] In this embodiment, the ratchet mechanism 2 includes an adjusting sleeve 21, a ratchet rotor 22, and a return spring 23. A cylindrical rotating cavity 210 is provided on the adjusting sleeve 21. The return spring 23 is located at the inner end of the rotating cavity 210. A plurality of axially extending clamping grooves 211 are further provided on the inner wall of the rotating cavity 210. The ratchet rotor 22 is axially slidably fitted in the clamping grooves 211 and its inner end abuts against the return spring 23. The fixed shaft 1 extends into the rotating cavity 210 and cooperates with the ratchet rotor 22. A one-way slidable locking tooth 221 is provided between the fixed shaft 1 and the ratchet rotor 22. The return spring 23 urges the locking tooth 221 on the ratchet rotor 22 to abut against the locking tooth 221 on the fixed shaft 1. When the adjusting sleeve 21 is rotated to one side, the ratchet rotor 22 is locked by the locking teeth 221, and the adjusting sleeve 21 is locked by cooperating with the clamping grooves 211 to prevent it from rotating. When the adjusting sleeve 21 is rotated to the other side, the ratchet rotor 22 compresses the return spring 23 through the action of the locking teeth 221, causing it to move towards the interior of the rotating cavity 210 to release the lock. At this time, when the adjusting sleeve 21 rotates, it drives the coiled spring 32 to rotate relative to the rotating seat 31, urging the coiled spring 32 to be pre-tightened.

[0027] Further, in order to facilitate driving the coiled spring 32 to be pre-tightened, a rotating shaft 24 parallel to the axial direction is provided at one end of the adjusting sleeve 21. The cross-section of the rotating shaft 24 is polygonal and it is made of a metal material. In order to facilitate fixing, a connecting sleeve 25 is sleeved at one end of the rotating shaft 24. The rotating shaft 24 is connected to the adjusting sleeve 21 through the connecting sleeve 25 to achieve power transmission.

[0028] Further, in order to facilitate driving the adjusting sleeve 21 to rotate, a rotating disc 212 is provided at one end of the adjusting sleeve 21 close to the fixed shaft 1. Tooth grooves 213 for increasing friction are provided on the outer edge of the rotating disc 212. The adjusting sleeve 21 can be finely adjusted through the tooth grooves 213 to achieve the best balance effect between the coiled spring 32 and the curtain.

[0029] Further, in order to improve stability, a rotating shaft sleeve 26 is rotatably fitted on the outer side of the adjusting sleeve 21. The rotating shaft sleeve 26 rotates with the rolling curtain together with the rotating seat 31. Through the rotating shaft sleeve 26, the connection area with the rolling curtain can be increased, thereby improving the connection strength and increasing the connection stability with the rolling curtain.

[0030] In this embodiment, the rotating base 31 includes a base body 311, a cover plate 312 and a reel 313. The torsion spring 32 is located inside the base body 311 and covered by the cover plate 312. The reel 313 is located at the center of the base body 311 and its two ends are rotatably abutted between the cover plate 312 and the base body 311. Specifically, the inner end of the torsion spring 32 is connected to the reel 313, and the outer end of the torsion spring 32 is connected to the inner wall of the base body 311. The rotating shaft 24 passes through the reel 313 and drives the torsion spring 32 to contract through the reel 313.

[0031] Furthermore, in order to further improve the scope of application, a buckle 314 extends to one side on the base body 311, and a buckle groove 315 is provided at the position corresponding to the buckle 314 on the cover plate 312. When the elastic force provided by one torsion spring mechanism 3 cannot balance the weight of the rolling curtain, multiple torsion spring mechanisms 3 are set up for cooperation. When multiple torsion spring mechanisms 3 are set up, the adjacent two torsion spring mechanisms 3 are clamped through the cooperation of the buckle 314 and the buckle groove 315.

[0032] What is described above in this specification is only an example of the present invention. Those skilled in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the content of this specification of the present invention or exceed the scope defined by this claim book, they should all belong to the protection scope of the present invention.

Claims

1. Push-pull coil spring, characterized in that: It includes a fixed shaft (1) for fixing on a wall, a ratchet mechanism (2) mounted on the fixed shaft (1), and at least one torsion spring mechanism (3) connected to the ratchet mechanism (2). The torsion spring mechanism (3) includes a rotating seat (31) and a torsion spring (32) fitted inside the rotating seat (31). The rotating seat (31) is connected to the rolling curtain, the torsion spring (32) is connected to the ratchet mechanism (2), and the ratchet mechanism (2) drives the torsion spring (32) to rotate relative to the rotating seat (31) so as to adjust the pre-tightening force.

2. The push-pull coil spring according to claim 1, wherein: The ratchet mechanism (2) includes an adjusting sleeve (21), a ratchet rotor (22), and a return spring (23). A rotating cavity (210) is provided on the adjusting sleeve (21). The return spring (23) is located inside the rotating cavity (210). Multiple axially extending clamping grooves (211) are further provided on the inner side of the rotating cavity (210). The ratchet rotor (22) is axially slidably fitted in the clamping grooves (211) and abuts against the return spring (23). The fixed shaft (1) extends into the rotating cavity (210) to cooperate with the ratchet rotor (22). A one-way slidable tooth (221) is provided between the fixed shaft (1) and the ratchet rotor (22). The return spring (23) drives the tooth (221) on the ratchet rotor (22) to abut against the tooth (221) on the fixed shaft (1).

3. The push-pull coil spring according to claim 2, characterized in that: One end of the adjusting sleeve (21) is also provided with a rotating shaft (24) parallel to the axis. One end of the rotating shaft (24) is sleeved with a connecting sleeve (25), and the rotating shaft (24) is connected to the adjusting sleeve (21) through the connecting sleeve (25).

4. The push-pull coil spring according to claim 2, characterized in that: One end of the adjusting sleeve (21) near the fixed shaft (1) is provided with a rotating disc (212), and a tooth groove (213) for increasing the friction force is provided on the outer edge of the rotating disc (212).

5. The push-pull coil spring according to claim 2, wherein: A rotating shaft sleeve (26) is rotatably fitted on the outer side of the adjusting sleeve (21), and the rotating shaft sleeve (26) rotates with the rolling curtain together with the rotating seat (31).

6. The push-pull coil spring according to claim 1, wherein: The rotating seat (31) includes a seat body (311), a cover plate (312), and a scroll (313). The torsion spring (32) is located inside the seat body (311) and is covered by the cover plate (312). The scroll (313) is located at the center of the seat body (311), and both ends thereof are rotatably abutted between the cover plate (312) and the seat body (311). The inner end of the torsion spring (32) is connected to the scroll (313), and the outer end of the torsion spring (32) is connected to the seat body (311). The ratchet mechanism (2) drives the scroll (313) to contract the torsion spring (32).

7. The push-pull coil spring according to claim 6, wherein: A buckle (314) extends from the seat body (311) to one side. A buckle groove (315) is provided at the corresponding position of the buckle (314) on the cover plate (312). When multiple torsion spring mechanisms (3) are provided, adjacent two torsion spring mechanisms (3) are clamped and connected through the cooperation of the buckle (314) and the buckle groove (315).

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