Rolling curtain limit device

Abstract

An embodiment of the present invention provides a rolling curtain limiting device, which includes a bottom beam fixed to the bottom edge of the curtain cloth of the rolling curtain and limiting plates respectively arranged on the support frames at opposite ends of the winding cylinder of the rolling curtain. The limiting plate includes a blocking portion formed by bending and extending downward from below the support frame into the lifting and moving space of the curtain cloth. The blocking portion is located between the winding cylinder and the bottom beam to block the bottom beam, and a slot is provided on the blocking portion for the side edge portion of the curtain cloth to pass through. In the embodiment of the present invention, by fixedly installing the bottom beam at the bottom edge of the curtain cloth of the rolling curtain and arranging the limiting plates on the support frames at opposite ends of the winding cylinder of the rolling curtain, when the winding cylinder winds the curtain cloth, the bottom beam at the bottom edge of the curtain cloth gradually rises, and finally the opposite ends of the bottom beam abut against the blocking portions on the two side support frames. The blocking portions block the further movement of the bottom beam towards the winding cylinder direction, so that the curtain cloth cannot be wound onto the winding cylinder any more, thereby limiting the rotation stroke of the winding cylinder. The structure is very simple and the design cost is relatively lower.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of curtain accessories, and particularly to a rolling curtain limit device. Background Art

[0002] The existing rolling curtain realizes the retraction and extension of the curtain cloth by driving a winding cylinder pivotally connected to corresponding support frames at both ends to rotate. To effectively limit the rotation stroke of the winding cylinder, a rolling curtain limit device is usually arranged inside the winding cylinder.

[0003] The existing rolling curtain limit device mainly includes a limiter for being relatively fixed with the winding cylinder in the circumferential direction to rotate synchronously and limit the rotation stroke of the winding cylinder, and a regulator connected to the limiter and exposed from one end of the winding cylinder for the user to operate to correspondingly adjust the limit stroke of the limiter on the winding cylinder. The limiter further includes a fixed sleeve and a lead screw with one end inserted into the fixed sleeve. The end of the lead screw extending into the fixed sleeve forms a coupling end with a square or other non-circular cross-section. The regulator includes a box body with through holes respectively arranged at opposite ends, and an adjusting shaft rod pivotally arranged inside the box body with both ends respectively facing the through holes on the box body. One end of the adjusting shaft rod is provided with a coupling hole adapted to the coupling end of the limiter, and the other end is provided with an operating part for the operator to rotate the adjusting shaft rod by using a tool.

[0004] However, due to the complex structure of the existing such rolling curtain limit device, the manufacturing cost is relatively high, and the main structure of the rolling curtain limit device needs to be assembled inside the winding cylinder, which is not conducive to reducing the diameter of the winding cylinder. Summary of the Invention

[0005] The technical problem to be solved by the embodiments of the present invention is to provide a rolling curtain limit device with a simple structure and capable of effectively limiting the rotation stroke of the winding cylinder.

[0006] To solve the above technical problem, the embodiments of the present invention provide the following technical solution: A rolling curtain limit device includes a bottom beam fixed to the bottom edge of the curtain cloth of the rolling curtain, and limit plates respectively arranged on the support frames at opposite ends of the winding cylinder of the rolling curtain. The limit plate includes a blocking portion bent and extended from below the support frame into the curtain cloth lifting and lowering space. The blocking portion is between the winding cylinder and the bottom beam to block the bottom beam, and a slot is formed on the blocking portion for the side edge portion of the curtain cloth to pass through.

[0007] Further, the limit plate further includes a connecting portion attached to the outer side surface of the support frame. The connecting portion is provided with a first pivoting portion on the side facing the support frame, and a second pivoting portion is correspondingly provided on the support frame. The limit plate and the support frame are correspondingly pivoted through the cooperation of the first pivoting portion and the second pivoting portion.

[0008] Further, the first pivoting portion is a clamping shaft protruding from one side of the connecting portion toward the support frame and having a barb at its end, and the second pivoting portion is a shaft hole. The clamping shaft is inserted into the shaft hole and the barb at its end hooks on the peripheral edge of the orifice at the end of the shaft hole away from the connecting portion.

[0009] Further, at least one slitting groove extending from the free end face of the clamping shaft toward the root of the clamping shaft is provided on the clamping shaft. The clamping shaft is divided into a plurality of symmetrically distributed elastic arms by the slitting groove, and the barb is provided at the end of each elastic arm.

[0010] Further, a limiting post is provided on one side face of the connecting portion toward the support frame below the first pivoting portion. An arc groove concentric with the shaft hole is provided on the support frame at a position corresponding to the limiting post, and the limiting post is inserted into the arc groove.

[0011] Further, one slitting groove is symmetrically provided on each of the two sides of the blocking portion near the edges.

[0012] Further, the blocking portion is bent and extended from the bottom of the connecting portion.

[0013] Further, the limiting plate and the support frame are integrally formed.

[0014] Further, the surface of the barb is a smooth arc guiding surface.

[0015] Further, the bottom beam includes a horizontal pipe with an installation groove axially provided on the side wall and end caps respectively assembled at opposite ends of the horizontal pipe for clamping and positioning the bottom edge of the curtain fabric in the installation groove.

[0016] After adopting the above technical solution, the embodiment of the present invention has at least the following beneficial effects: In the embodiment of the present invention, a bottom beam is fixedly installed at the bottom edge of the curtain fabric of the rolling curtain, and limiting plates are provided on the support frames at opposite ends of the winding cylinder of the rolling curtain. The blocking portion is formed by bending and extending from below the support frame toward the lifting space of the curtain fabric. In specific implementation, the side edge portion of the curtain fabric passes through the slitting groove on the blocking portion, and the slitting groove can realize the guiding and limiting of the curtain fabric. When the winding cylinder winds up the curtain fabric, the bottom beam at the bottom edge of the curtain fabric gradually rises, and finally the opposite ends of the bottom beam abut against the blocking portions on the two side support frames. The blocking portion blocks the further movement of the bottom beam toward the winding cylinder direction, so that the curtain fabric can no longer be wound onto the winding cylinder, thereby limiting the rotation stroke of the winding cylinder. The structure is very simple and the design cost is relatively lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural view of a split state of an optional embodiment of the rolling curtain limiting device of the present invention.

[0018] Figure 2 The structural schematic diagram of the combined state of an alternative embodiment of the rolling curtain limiting device of the present invention.

[0019] Figure 3 The sectional structural schematic diagram along the axial direction of the winding cylinder when the bottom beam of an alternative embodiment of the rolling curtain limiting device of the present invention abuts against the stopping portion.

[0020] Figure 4 The structural schematic diagram of the limiting plate of an alternative embodiment of the rolling curtain limiting device of the present invention.

[0021] Figure 5 The sectional structural schematic diagram along the axial direction of the winding cylinder when the bottom beam of another alternative embodiment of the rolling curtain limiting device of the present invention abuts against the stopping portion. Detailed implementation manners

[0022] The following further describes the present application in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. Moreover, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0023] As Figures 1 - 4 shown, an alternative embodiment of the present invention provides a rolling curtain limiting device, including a bottom beam 3 fixed to the bottom edge of the curtain cloth 1 of the rolling curtain 2 and limiting plates 7 respectively arranged on the support frames 6 at opposite ends of the winding cylinder 5 of the rolling curtain 2. The limiting plate 7 includes a stopping portion 70 bent and extended from below the support frame 6 towards the lifting and moving space of the curtain cloth 1. The stopping portion 70 is located between the winding cylinder 5 and the bottom beam 3 to block the bottom beam 3, and a slot 701 for the side edge portion of the curtain cloth 1 to pass through is formed on the stopping portion 70.

[0024] In the embodiment of the present invention, by fixedly installing the bottom beam 3 at the bottom edge of the curtain cloth 1 of the rolling curtain 2 and arranging the limiting plates 7 on the support frames 6 at opposite ends of the winding cylinder 5 of the rolling curtain 2, and by forming the stopping portion 70 on the limiting plate 7 by bending and extending from below the support frame 6 towards the lifting and moving space of the curtain cloth 1. In specific implementation, the side edge portion of the curtain cloth 1 passes through the slot 701 on the stopping portion 70, and the slot 701 can realize the guiding and limiting of the curtain cloth 1. When the winding cylinder 5 winds up the curtain cloth 1, the bottom beam 3 at the bottom edge of the curtain cloth 1 gradually rises, and finally the opposite ends of the bottom beam 3 abut against the stopping portions 70 on the two side support frames 6. The stopping portion 70 blocks the further movement of the bottom beam 3 towards the winding cylinder 5, so that the curtain cloth 1 cannot be wound onto the winding cylinder 5 any more, thereby limiting the rotation stroke of the winding cylinder 5. The structure is very simple and the design cost is relatively lower.

[0025] In an alternative embodiment of the present invention, as Figures 1 - 4As shown, the limiting plate 7 further includes a connecting portion 72 attached to the outer side surface of the support frame 6. On the side of the connecting portion 72 facing the support frame 6, there is a first pivoting portion 74. Correspondingly, a second pivoting portion 60 is provided on the support frame 6. The limiting plate 7 and the support frame 6 are pivotally connected correspondingly through the cooperation of the first pivoting portion 74 and the second pivoting portion 60. In this embodiment, by providing the connecting portion 72 and using the cooperation of the first pivoting portion 74 and the second pivoting portion 60 to realize the mutual pivoting of the limiting plate 7 and the support frame 6. On the one hand, when the curtain cloth 1 is gradually wound onto the winding cylinder 5, the thickness of the curtain cloth 1 on the winding cylinder 5 gradually increases, and the plane of the curtain cloth 1 that has not been wound gradually moves away from the central axis of the winding cylinder 5. By pivotally connecting the limiting plate 7 and the support frame 6 to each other, the limiting plate 7 and the support frame 6 move away from the central axis of the winding cylinder 5 along with the curtain cloth 1, that is, the limiting plate 7 and the support frame 6 swing relative to the support frame 6 gradually around the central axis of the winding cylinder 5, and the slot 701 on the blocking portion 70 can better guide and limit the curtain cloth 1. On the other hand, when the user pulls the curtain cloth 1, since the limiting plate 7 can swing appropriately relative to the support frame 6 in response to the pulling operation of the user, so that no obvious turning angle is formed at the slot 701 of the curtain cloth, thus avoiding obvious friction between the curtain cloth 1 and the slot 701, making the operation of the user pulling the curtain cloth 1 smoother, and at the same time avoiding wear of the curtain cloth 1.

[0026] In an alternative embodiment of the present invention, as Figure 1 and Figure 4 shown, the first pivoting portion 74 is a clamping shaft protruding from the side of the connecting portion 72 facing the support frame 6 and having a barb 741 at its end. The second pivoting portion 60 is a shaft hole. The clamping shaft 74 passes through the shaft hole 60 and the barb 741 at its end hooks on the peripheral edge of the hole opening at the end of the shaft hole 60 away from the connecting portion 72. In this embodiment, by hooking the barb 741 at the end of the clamping shaft 74 on the peripheral edge of the hole opening at the end of the shaft hole 60 away from the connecting portion 72, the mutual pivoting of the limiting plate 7 and the support frame 6 can be effectively realized, with a simple structure and relatively convenient molding.

[0027] In an alternative embodiment of the present invention, as Figure 4As shown, at least one cut groove 743 extending from the free end face of the card shaft 74 towards the root of the card shaft 74 is provided on the card shaft 74. The card shaft 74 is divided into several symmetrically distributed elastic arms 745 by the cut groove 743, and the barbs 741 are provided at the ends of each elastic arm 745. In this embodiment, by providing the cut groove 743 to divide the card shaft 74 into multiple elastic arms 745, during the process of assembling the card shaft 74 into the shaft hole 60, the barbs 741 are first squeezed, causing the elastic arms 745 to undergo elastic deformation so that the barbs 741 can smoothly pass through the shaft hole 60. After the barbs 741 pass through the shaft hole 60, the elastic arms 745 rebound to make the barbs 741 hook on the peripheral edge of the hole opening at the end of the shaft hole 60 away from the connecting portion 72, which is convenient for assembly.

[0028] In another alternative embodiment of the present invention, as Figure 1 shown, a limiting post 76 is further provided on the side surface of the connecting portion 72 facing the support frame 6 below the first pivot portion 74. An arc groove 62 concentric with the shaft hole 60 is provided on the support frame 6 at a position corresponding to the limiting post 76, and the limiting post 76 is inserted into the arc groove 62. In this embodiment, by inserting the limiting post 76 into the arc groove 62 and reasonably designing the length of the arc groove 62, the rotation angle of the limiting plate 7 relative to the support frame 6 can be effectively limited. The structure is simple and the implementation is relatively convenient. In such as Figures 1 - 3 In the embodiment, the arc groove 62 is provided on the support frame 6 while the limiting post 76 is provided on the connecting portion 72. On the one hand, the connecting portion 72 can effectively cover the arc groove 62 to prevent foreign objects from entering the arc groove 62; on the other hand, it is easier to form the arc groove 62 on the support frame 6 and the forming is more convenient.

[0029] In still another alternative embodiment of the present invention, as Figure 4 shown, a slit groove 701 is symmetrically provided on each side edge of the stop portion 70. In this embodiment, since the curtain cloth 1 is usually located on one side of the winding cylinder 5, in order to facilitate the accurate alignment of the slit groove 701 with the curtain cloth 1, by providing two slit grooves 701, each limiting plate 7 can be effectively adapted and installed regardless of which end of the winding cylinder 5 it is assembled to, improving the compatibility of the limiting plate 7 and reducing the manufacturing difficulty.

[0030] In another alternative embodiment of the present invention, as Figure 4 shown, the stop portion 70 is bent and extended from the bottom of the connecting portion 72. In this embodiment, by integrally bending and forming the connecting portion 72 and the stop portion 70, the structure is simple. An independent limiting structure is formed by the connecting portion 72 and the stop portion 70, which is convenient for assembly and can realize the separate transportation and sales of the rolling curtain limiting device and other components of the rolling curtain 2.

[0031] In another alternative embodiment of the present invention, as Figure 5 shown, the limiting plate 7 and the support frame 1 are integrally formed. In this embodiment, the limiting plate 7 and the support frame 1 are directly integrally formed, without separately assembling the limiting plate 7 additionally, which is more convenient for installation and can also achieve the limitation of the bottom beam 3.

[0032] In yet another alternative embodiment of the present invention, as Figure 4 shown, the surface of the barb 741 is a smooth arc guiding surface 747. In this embodiment, by providing the arc guiding surface 747, it is convenient for the barb 741 to deform and pass through the shaft hole 60, facilitating assembly.

[0033] In an alternative embodiment of the present invention, as Figure 1 shown, the bottom beam 3 includes a cross tube 30 with an installation groove 301 axially formed in its side wall, and end caps 32 respectively assembled at opposite ends of the cross tube 30 for clamping and positioning the bottom edge of the curtain cloth 1 in the installation groove 301. In this embodiment, the bottom beam 3 adopts the structural form of the cross tube 30 and the end caps 32, which can be stably fixed to the bottom edge of the curtain cloth 1, is not easy to loosen, and can effectively support and counterweight the curtain cloth 1.

[0034] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims. All of these fall within the protection scope of the present invention.

Claims

1. A rolling curtain limiting device, characterized in that, the device includes a bottom beam fixed to the bottom edge of the curtain cloth of the rolling curtain and limiting plates respectively arranged on the support frames at opposite ends of the winding cylinder of the rolling curtain. The limiting plate includes a stop portion bent and extended from below the support frame into the lifting space of the curtain cloth. The stop portion is located between the winding cylinder and the bottom beam to block the bottom beam, and a slot is formed on the stop portion for the side edge portion of the curtain cloth to pass through; the limiting plate further includes a connecting portion attached to the outer side surface of the support frame. A first pivoting portion is provided on one side of the connecting portion facing the support frame, and a second pivoting portion is correspondingly provided on the support frame. The limiting plate and the support frame are correspondingly pivoted by the cooperation of the first pivoting portion and the second pivoting portion.

2. The rolling curtain limiting device according to claim 1, characterized in that, the first pivoting portion is a clamping shaft protruding from one side of the connecting portion facing the support frame and having a barb at the end. The second pivoting portion is a shaft hole. The clamping shaft is inserted into the shaft hole and the barb at the end hooks on the peripheral edge of the hole opening at one end of the shaft hole away from the connecting portion.

3. The rolling curtain limiting device according to claim 2, characterized in that, at least one slitting groove extending from the free end surface of the clamping shaft to the root of the clamping shaft is provided on the clamping shaft. The clamping shaft is divided into several symmetrically distributed elastic arms by the slitting groove, and the barb is provided at the end of each elastic arm.

4. The rolling curtain limiting device according to claim 2, characterized in that, a limiting post is further provided on one side surface of the connecting portion facing the support frame below the first pivoting portion. An arc groove concentric with the shaft hole is provided on the support frame at a position corresponding to the limiting post. The limiting post is inserted into the arc groove.

5. The rolling curtain limiting device according to claim 1, characterized in that, one slot is symmetrically provided at each of the two side edges of the stop portion.

6. The rolling curtain limiting device according to claim 1, characterized in that, the stop portion is bent and extended from the bottom of the connecting portion.

7. The rolling curtain limiting device according to claim 1, characterized in that, the limiting plate and the support frame are integrally formed.

8. The rolling curtain limiting device according to claim 2, characterized in that, the surface of the barb is a smooth arc guiding surface.

9. The rolling curtain limiting device according to claim 1, characterized in that, the bottom beam includes a horizontal pipe with an installation groove axially opened on the side wall and end caps respectively assembled at opposite ends of the horizontal pipe for clamping and positioning the bottom edge of the curtain cloth in the installation groove.

Images