Roller shutter spring non-return structure

Abstract

The utility model relates to the field of roller shutters, in particular to a roller shutter spring non-return structure which comprises a winding drum, a female crown installed at the end of the winding drum, a male crown rotatably installed in the female crown, a center shaft rotatably installed in the winding drum, and a torsional spring installed on the center shaft and used for driving the winding drum to rotate and reset. The end part of the central shaft penetrates through the male crown and extends out of the winding drum, the male crown is circumferentially fixed with the central shaft, a limiting groove is formed in the male crown, a non-return shifting piece which can be clamped into the limiting groove after being rotated to enable the male crown and the female crown to be circumferentially fixed is rotationally mounted on the female crown, the male crown extends out of the female crown, and the peripheral part of the male crown is sunken inwards to form the limiting groove. The non-return shifting piece comprises a positioning ring, a screw which penetrates through the positioning ring and is installed on the female crown in a screwed mode is installed on the non-return shifting piece, a clamping plate extending outwards is arranged on the positioning ring, and the end of the clamping plate is installed in the limiting groove in a clamped mode. The roller shutter spring non-return structure is remarkable in non-return effect, and the problem that when a roller shutter is rolled back, the rolling elastic force is too large or too small can be effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of roller blinds, specifically to a roller blind spring anti-reverse structure. Background Technology

[0002] Roller blinds are widely used in street-side retail stores, restaurants, coffee shops, shopping malls, and supermarkets. By installing the roller blind on the outside of the window, the curtain is rolled up on the roller and provides sun shading when opened. The built-in spring of the roller blind is the core component that enables the curtain to roll up automatically. When the curtain is pulled, the spring is compressed and stores energy. When the curtain is released, it drives the roller to rotate, thus realizing the automatic rolling up of the curtain.

[0003] However, during installation or maintenance, if the initial tension of the torsion spring is not set properly, or if the spring fails due to fatigue, the roller shutter may fail to rewind properly or rewind too quickly, affecting normal use. In such cases, traditional methods require disassembling the entire roller to adjust the preload of the built-in torsion spring, which is not only cumbersome but also inefficient and needs improvement. Utility Model Content

[0004] The purpose of this invention is to provide a roller shutter spring anti-reverse structure that allows for easy adjustment of spring force, addressing the above-mentioned problems.

[0005] To achieve the above objectives, this utility model discloses a roller shutter spring anti-reverse structure, including a roller drum. Its structural features are: a female crown is installed at the end of the roller drum; a male crown is rotatably installed within the female crown; a central shaft is rotatably installed within the roller drum; a torsion spring for driving the roller drum to rotate and reset is installed on the central shaft; the end of the central shaft passes through the male crown and protrudes from the roller drum; the male crown is circumferentially fixed to the central shaft; a limiting groove is provided on the male crown; and an anti-reverse paddle is rotatably installed on the female crown, capable of rotating and engaging with the limiting groove to circumferentially fix the male and female crowns.

[0006] When the anti-reverse lever is not engaged in the limiting groove, the central shaft and the drum can rotate relative to each other. At this time, rotating the drum can adjust the compression force of the torsion spring. After the torsion spring is adjusted to the correct position, the anti-reverse lever is engaged in the limiting groove. At this time, the central shaft and the drum cannot rotate relative to each other, and the roller blind can be rolled up normally. This device has a simple structure and a significant anti-reverse effect, which can effectively solve the problem of excessive or insufficient rolling force when the roller blind is rolled back.

[0007] The male crown protrudes beyond the female crown, and the outer periphery of the male crown is recessed inward to form a retaining groove. The retaining groove is located on the outer contour of the male crown, which facilitates the insertion of the lever, simplifies the structure, and provides a clear engagement position.

[0008] The anti-reverse lever includes a locating ring, on which a screw passes through the locating ring and is screwed onto the female crown. A rivet can also be used instead of a screw. The locating ring is rotatable, allowing the lever to rotate around the screw to engage or disengage from the limiting groove.

[0009] The positioning ring has an outwardly extending locking plate, the end of which is engaged in a limiting groove. The locking plate can swing as the positioning ring rotates, thereby locking into or disengaging from the limiting groove.

[0010] The end of the card plate is equipped with a limiting plate that extends along the depth direction of the limiting groove. The limiting plate increases the contact area in the depth direction of the limiting groove, making the fit between the anti-reverse lever and the limiting groove more secure and reliable.

[0011] The positioning ring has an outwardly extending handle, which is convenient for manual operation. When rotating the anti-reverse lever, you can simply hold the handle without the need for tools.

[0012] A drive wheel is fixedly installed inside the drum. One end of a torsion spring is fixedly connected to the drive wheel, and the other end of the torsion spring is fixedly connected to the central shaft. The torque of the torsion spring is transmitted to the drum through the drive wheel. The drive wheel directly drives the drum, which can reduce the loss of spring force.

[0013] The male crown has a positioning hole, and a bolt that passes through the positioning hole and is tightened onto the central shaft is mounted on the male crown. Tightening the bolt prevents relative slippage between the two and ensures that the force is directly transmitted when the anti-reverse trigger is activated.

[0014] One end of the torsion spring, connected to the central shaft, extends into the upper side of the positioning hole, and a bolt presses against the end of the torsion spring. Tightening the bolt prevents displacement of the torsion spring's end.

[0015] The male and female crowns are installed at one end of the roller drum, and a tail plug is installed at the other end of the drum, with a rotating shaft mounted on the tail plug. The roller blind is used in conjunction with a bracket. The rotating shaft is mounted on the bracket, and the central shaft is circumferentially fixed to the bracket. When the curtain is pulled, the roller drum rotates, but the central shaft does not rotate. At this time, the spring stores force. When the curtain is released, the roller drum returns to its original position under the action of the spring, causing the curtain to be rolled back onto the roller drum.

[0016] In summary, the beneficial effects of this utility model are as follows: This structure can effectively solve the problem of excessive or insufficient retraction elasticity when the roller blind rolls back, achieving high reliability, easy maintenance and long service life in a limited space, and is suitable for roller blind scenarios with frequent use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the disassembly structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the drive wheel mounting structure;

[0019] Figure 3 A schematic diagram of the structure in which the anti-reverse lever and the limiting groove are engaged.

[0020] Figure 4 Schematic diagram of the structure in the separated state of the anti-reverse lever and the limiting groove;

[0021] Figure 5 This is a schematic diagram of the installation structure for the central axis;

[0022] Figure 6 This is a schematic diagram of the installation structure of the tail plug and the rotating shaft.

[0023] In the diagram: 1. Central shaft; 2. Male crown; 3. Female crown; 4. Anti-reverse pawl; 5. Torsion spring; 6. Drive wheel; 7. Limiting groove; 8. Handle; 9. Screw; 10. Drum; 11. Clamping plate; 12. Positioning ring; 13. Positioning hole; 14. Bolt; 15. Tail plug; 16. Rotating shaft; 17. Limiting plate. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0025] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0029] A roller shutter spring anti-reverse structure includes a roller drum 10, a female crown 3 installed at the end of the roller drum 10, a male crown 2 rotatably installed in the female crown 3, a central shaft 1 rotatably installed in the roller drum 10, a torsion spring 5 installed on the central shaft 1 for driving the roller drum 10 to rotate and reset, the end of the central shaft 1 passing through the male crown 2 and protruding out of the roller drum 10, the male crown 2 being circumferentially fixed to the central shaft 1, the male crown 2 having a limiting groove 7, and an anti-reverse lever 4 rotatably installed on the female crown 3, capable of rotating and engaging with the limiting groove 7 to circumferentially fix the male crown 2 and the female crown 3. (See attached diagram) Figure 1 When the anti-reverse lever 4 is not engaged in the limiting groove 7, the central shaft 1 and the drum 10 can rotate relative to each other. At this time, rotating the drum 10 can adjust the compression force of the torsion spring 5. After the torsion spring 5 is adjusted to the correct position, the anti-reverse lever 4 is engaged in the limiting groove 7. At this time, the central shaft 1 and the drum 10 cannot rotate relative to each other, and the roller blind can be rolled up normally. This device has a simple structure and a significant anti-reverse effect, which can effectively solve the problem of excessive or insufficient rolling force when the roller blind is rolled back.

[0030] See attached document Figure 3 The male crown 2 protrudes from the female crown 3, and the outer periphery of the male crown 2 is recessed inward to form a limiting groove 7. The limiting groove 7 is located on the outer contour of the male crown 2, which facilitates the insertion of the paddle, simplifies the structure, and provides a clear engagement position. The anti-reverse paddle 4 includes a positioning ring 12, on which a screw 9 passes through the positioning ring 12 and is screwed onto the female crown 3. The screw 9 can also be replaced by a rivet. The positioning ring 12 can rotate, allowing the paddle to rotate around the screw 9 to engage or disengage from the limiting groove 7. The positioning ring 12 has an outwardly extending retaining plate 11, the end of which is engaged in the limiting groove 7. The retaining plate 11 can swing as the positioning ring 12 rotates, thereby engaging or disengaging from the limiting groove 7. The end of the retaining plate 11 has a limiting plate 17, which extends along the depth direction of the limiting groove 7. The limiting plate 17 increases the contact area in the depth direction of the limiting groove 7, making the fit between the anti-reverse lever 4 and the limiting groove 7 more secure and reliable. The positioning ring 12 is provided with an outwardly extending handle 8, which facilitates manual operation. When rotating the anti-reverse lever 4, the handle 8 can be held by hand without the need for tools.

[0031] See attached document Figure 1A drive wheel 6 is fixedly installed in the drum 10. One end of the torsion spring 5 is fixedly connected to the drive wheel 6, and the other end of the torsion spring 5 is fixedly connected to the central shaft 1. The torque of the torsion spring 5 is transmitted to the drum 10 through the drive wheel 6. The drive wheel 6 directly drives the drum 10, which can reduce the loss of spring force. The male crown 2 is provided with a positioning hole 13, and a bolt 14 is installed on the male crown 2, passing through the positioning hole 13 and tightened on the central shaft 1. The bolt 14 is tightened to prevent relative sliding between the two and ensure that the force is directly transmitted when the anti-reverse trigger is activated. The end of the torsion spring 5 connected to the central shaft 1 extends into the upper side of the positioning hole 13, and the bolt 14 presses against the end of the torsion spring 5. The torsion spring 5 is tightened by the bolt 14 to prevent the end of the torsion spring 5 from shifting.

[0032] See attached document Figure 5 Appendix Figure 6 The male crown 2 and female crown 3 are installed at one end of the roller 10, and the other end of the roller 10 is equipped with a tail plug 15, on which a rotating shaft 16 is installed. The roller blind is used in conjunction with the bracket. The rotating shaft 16 is rotatably mounted on the bracket, and the central shaft 1 is circumferentially fixed to the bracket. When the curtain is pulled, the roller 10 rotates, but the central shaft 1 does not rotate. At this time, the spring stores force. When the curtain is released, the roller 10 returns to its original position under the action of the spring, causing the curtain to be rolled up onto the roller 10.

[0033] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A roller shutter spring anti-reverse structure, comprising a roller (10), characterized in that, The end of the drum (10) is equipped with a female crown (3), and a male crown (2) is rotatably installed in the female crown (3). A central shaft (1) is rotatably installed in the drum (10). A torsion spring (5) for driving the drum (10) to rotate and reset is installed on the central shaft (1). The end of the central shaft (1) passes through the male crown (2) and protrudes out of the drum (10). The male crown (2) is circumferentially fixed to the central shaft (1). A limiting groove (7) is provided on the male crown (2). A backstop plate (4) is rotatably installed on the female crown (3) so that it can rotate and be inserted into the limiting groove (7) to fix the male crown (2) and the female crown (3) circumferentially.

2. The roller shutter spring anti-reverse structure as described in claim 1, characterized in that, The male crown (2) protrudes from the female crown (3), and the outer periphery of the male crown (2) is recessed inward to form a limiting groove (7).

3. The roller shutter spring anti-reverse structure as described in claim 1, characterized in that, The anti-reverse lever (4) includes a positioning ring (12), and a screw (9) is installed on the anti-reverse lever (4) through the positioning ring (12) and screwed onto the female crown (3).

4. The roller shutter spring anti-reverse structure as described in claim 3, characterized in that, The positioning ring (12) is provided with an outwardly extending clamping plate (11), the end of which is clamped in the limiting groove (7).

5. The roller shutter spring anti-reverse structure as described in claim 4, characterized in that, The end of the card plate (11) is provided with a limiting plate (17), which extends along the depth direction of the limiting groove (7).

6. The roller shutter spring anti-reverse structure as described in claim 3, characterized in that, The positioning ring (12) is provided with an outwardly extending lever (8).

7. The roller shutter spring anti-reverse structure as described in claim 1, characterized in that, A drive wheel (6) is fixedly installed in the drum (10), one end of the torsion spring (5) is fixedly connected to the drive wheel (6), and the other end of the torsion spring (5) is fixedly connected to the central shaft (1).

8. The roller shutter spring anti-reverse structure as described in claim 7, characterized in that, The male crown (2) is provided with a positioning hole (13), and a bolt (14) is installed on the male crown (2) that passes through the positioning hole (13) and is tightened on the central shaft (1).

9. The roller shutter spring anti-reverse structure as described in claim 8, characterized in that, One end of the torsion spring (5) connected to the central shaft (1) extends into the upper side of the positioning hole (13), and the bolt (14) presses against the end of the torsion spring (5).

10. The roller shutter spring anti-reverse structure as described in claim 8, characterized in that, The male crown (2) and female crown (3) are installed at one end of the drum (10), and a tail plug (15) is installed at the other end of the drum (10). A rotating shaft (16) is installed on the tail plug (15).

Images