Lifting curtain

Abstract

The utility model relates to a lifting curtain which comprises a bottom shell, a rotating shaft rotationally arranged on the bottom shell and a curtain body capable of being wound on the rotating shaft, one end of the curtain body is connected to the rotating shaft, the other end of the curtain body is provided with a fixing rod, and at least one lifting supporting assembly is arranged on the bottom shell. The lifting supporting assembly comprises an air pressure supporting rod, a first connecting rod, two second connecting rods arranged in parallel and a third connecting rod, the first connecting rod, the two second connecting rods arranged in parallel and the third connecting rod are sequentially hinged between the bottom shell and the fixing rod, one end of the air pressure supporting rod is hinged to the bottom shell, and the other end of the air pressure supporting rod is hinged to the fixing rod. And the other end is hinged to the first connecting rod. The lifting curtain designed by the utility model can stably lift and support the curtain, and is not easy to break down.

Description

Technical Field

[0001] This utility model relates to the field of projection screen technology, and in particular to a liftable screen. Background Technology

[0002] A floor-mounted projection screen is a type of projection screen that can be raised and lowered. Floor-mounted screens are typically fixed to the ground and unfold by rising upwards. They consist of a folding support structure made up of several connecting rods. When the screen needs to be unfolded, the folding support structure is pulled up to support the screen; when the screen needs to be rolled up, the folding support structure is lowered. Most existing floor-mounted screens use a cross-link structure for their folding support structure, which includes two connecting rods that are cross-hinged. During unfolding / folding, the cross-hinged point of the two connecting rods must withstand repeated shear stress and rotational torque. Over long-term use, the cross-hinged point is prone to failure, leading to screen lifting malfunction. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this invention is to design a lifting screen that can stably support the lifting of the screen and is less prone to malfunctions.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] Design a lifting screen, comprising: a base shell, a rotating shaft rotatably mounted on the base shell, and a screen that can be rolled up on the rotating shaft. One end of the screen is connected to the rotating shaft, and the other end is provided with a fixed rod. At least one set of lifting support components is provided on the base shell. The lifting support components include a pneumatic strut, a first connecting rod, two parallel second connecting rods, and a third connecting rod. The first connecting rod, the two parallel second connecting rods, and the third connecting rod are sequentially hinged between the base shell and the fixed rod. One end of the pneumatic strut is hinged to the base shell, and the other end is hinged to the first connecting rod.

[0006] The lifting screen designed in this scheme achieves smooth lifting and lowering support through a multi-stage linkage system. A hinged system consisting of a first link, two parallel second links, and a third link forms a composite lever-parallelogram hybrid mechanism, effectively dispersing the torque caused by the screen's weight. The double parallel second link design counteracts lateral torque, preventing lateral shift of the screen during lifting. The pneumatic strut is a telescopic mechanism with a certain amount of resistance during extension and retraction. The linkage design between the pneumatic strut and the first link provides adaptive support. One end of the pneumatic strut is hinged to the first link, and the other end is hinged to the base shell, allowing the lifting support assembly to have a braking function during folding and unfolding, which enhances the structural stability of the lifting support assembly and reduces vibration during movement. The pneumatic strut allows the lifting support assembly to unfold and fold under external force, maintaining a stable posture after the external force is removed. Furthermore, the number of lifting support components depends on the size of the screen. For smaller screens, one set of lifting support components is sufficient in the middle of the bottom shell. For larger screens, at least one set of lifting support components should be installed on each side of the bottom shell. When the screen needs to be unfolded, the fixing rod can be manually pulled up to increase the distance between the fixing rod and the bottom shell, thereby enabling the screen to unfold. The lifting support components provide stable support for the screen.

[0007] Furthermore, both ends of the two second links are provided with hinge joints. One of the hinge joints where the second link is hinged to the first link forms a limiting structure with the first link, and the other hinge joint where the second link is hinged to the third link forms a limiting structure with the third link.

[0008] By forming a double kinematic pair constraint with the first and third links through two second links, precise motion constraint and degree of freedom control can be achieved. The double limit structure can control the unfolding angle between the second link and the first and third links, so that the lifting support assembly can maintain a stable structure when fully unfolded.

[0009] Furthermore, the bottom shell includes a base, side plates disposed on both sides of the base along its length, and a flip cover rotatably disposed on the base. The flip cover, side plates, and base together form a receiving cavity. The rotating shaft is located within the receiving cavity, and the fixing rod and lifting support assembly can be placed within the receiving cavity.

[0010] By incorporating a storage cavity to create a fully enclosed design, all components can be hidden inside the cavity when not in operation, thus protecting the components and reducing the space occupied, making it easier to transport and move them.

[0011] Furthermore, a support groove is provided on the side plate near the receiving cavity. When the fixing rod descends into the receiving cavity, both ends of the fixing rod are respectively placed in the support groove.

[0012] The support groove limits the fixing rod. When the fixing rod descends into the receiving cavity, the support grooves at both ends of the receiving cavity limit and constrain the fixing rod, which can prevent it from shaking in the receiving cavity and causing the curtain to wrinkle.

[0013] Furthermore, the fixing rod includes a hollow first fixing rod and a hollow second fixing rod, the first fixing rod being inserted into the second fixing rod, and the side wall of the first fixing rod having a first slot along the axial direction.

[0014] The double-rod nested structure enhances the strength of the fixing rods, and both the first and second fixing rods can be replaced individually. If one is damaged, only the damaged part needs to be replaced, reducing operating costs. One end of the screen can be embedded in the first slot to securely connect with the first fixing rod. The length of the first fixing rod is not less than the width of the screen, which helps to improve the flatness of the screen when unfolded, thus improving projection quality.

[0015] Furthermore, the hollow inner cavity of the first fixing rod is provided with reinforcing ribs.

[0016] The reinforcing rib is in the shape of a straight line and is connected to the inner wall of the first fixed rod cavity. It can not only improve the axial rigidity of the first fixed rod to avoid deformation, but also prevent the tube wall from deforming due to radial external force, causing deformation of the first slot.

[0017] Furthermore, the outer periphery of the first fixing rod is provided with a limiting groove along the axis, and the inner wall of the second fixing rod is provided with a limiting protrusion corresponding to the limiting groove.

[0018] The limiting groove and the limiting protrusion mesh with each other to form a limiting structure between the first fixed rod and the second fixed rod, which can prevent the two from rotating and at the same time ensure that the first slot can be vertically downward after the first fixed rod and the second fixed rod are nested.

[0019] Furthermore, the second fixing rod is provided with a handle, and the two ends of the handle are rotatably connected to the second fixing rod.

[0020] The handle is located in the middle of the second fixed rod, which provides a gripping base for the second fixed rod and improves the ease of operation of pulling the fixed rod.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] The lifting screen designed in this scheme achieves smooth lifting and lowering support through a multi-stage linkage system. A hinged system consisting of a first link, two parallel second links, and a third link forms a composite lever-parallelogram hybrid mechanism, effectively dispersing the torque caused by the screen's weight. The double parallel second link design counteracts lateral torque, preventing lateral shift of the screen during lifting. The pneumatic strut is a telescopic mechanism with a certain degree of resistance during extension and retraction. The linkage design between the pneumatic strut and the first link provides adaptive support. One end of the pneumatic strut is hinged to the first link, and the other end is hinged to the base shell, allowing the lifting support assembly to have a braking function during folding and unfolding, which enhances the structural stability of the lifting support assembly and reduces vibration during movement. The pneumatic strut enables the lifting support assembly to unfold and fold under external force and maintain a stable posture after the external force is removed. Furthermore, the number of lifting support components depends on the size of the screen. For smaller screens, one set of lifting support components is sufficient in the middle of the bottom shell. For larger screens, at least one set of lifting support components should be installed on each side of the bottom shell. When the screen needs to be unfolded, the fixing rod can be manually pulled up to increase the distance between the fixing rod and the bottom shell, thereby enabling the screen to unfold. The lifting support components provide stable support for the screen. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a lifting screen according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of a lifting screen (without a screen) according to an embodiment of the present invention.

[0025] Figure 3 for Figure 2 A magnified view of A in the middle.

[0026] Figure 4 for Figure 2 A magnified view of B in the middle.

[0027] Figure 5 This is a partial view of a fixing rod according to an embodiment of the present invention.

[0028] Figure 6 for Figure 5 The left view.

[0029] Figure 7 This is a partial view of another structural type of the fixing rod according to this utility model.

[0030] Figure 8 for Figure 7 The left view.

[0031] Illustrations: 1. Bottom shell; 11. Base; 12. Side plate; 13. Flip cover; 14. Receiving cavity; 121. Support groove; 2. Rotating shaft; 3. Curtain; 4. Fixing rod; 41. First fixing rod; 42. Second fixing rod; 43. Handle; 411. First slot; 412. Reinforcing rib; 413. Limiting groove; 421. Second slot; 422. Limiting protrusion; 5. Lifting support assembly; 51. First connecting rod; 52. Second connecting rod; 53. Third connecting rod; 54. Pneumatic strut; 55. Limiting structure; 521. Hinge joint. Detailed Implementation

[0032] To facilitate understanding of this invention, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the invention. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0033] like Figures 1 to 4 As shown, this embodiment provides a lifting screen, including: a base shell 1, a rotating shaft 2 rotatably mounted on the base shell 1, and a screen 3 that can be wound around the rotating shaft 2. One end of the screen 3 is connected to the rotating shaft 2, and the other end is provided with a fixing rod 4. A torsion spring structure is provided inside the rotating shaft 2 to realize the automatic winding function of the screen 3. At least one set of lifting support components 5 is provided on the base shell 1. The number of lifting support components 5 is related to the size of the screen 3. When the size of the screen 3 is small, one set of lifting support components 5 is provided in the middle of the base shell 1. When the size of the screen 3 is large, at least one set of lifting support components 5 is provided on each side of the base shell 1. In this embodiment, two sets of lifting support components 5 are provided. The lifting support assembly 5 includes a pneumatic strut 54, a first connecting rod 51, two parallel second connecting rods 52, and a third connecting rod 53. The first connecting rod 51, the two parallel second connecting rods 52, and the third connecting rod 53 are sequentially hinged between the base shell 1 and the fixed rod 4. One end of the pneumatic strut 54 is hinged to the base shell 1, and the other end is hinged to the first connecting rod 51. Both ends of the two second connecting rods 52 are provided with hinge joints 521. The hinge joint 521 of one second connecting rod 52 that is hinged to the first connecting rod 51 forms a limiting structure with the first connecting rod 51, and the hinge joint 521 of the other second connecting rod 52 that is hinged to the third connecting rod 53 forms a limiting structure 55 with the third connecting rod 53. The two second links 52, together with the first link 51 and the third link 53, form a double kinematic pair constraint, which realizes precise motion constraint and degree of freedom control. The double limit structure can control the unfolding angle between the second link 52 and the first link 51 and the third link 53, so that the lifting support assembly 5 can maintain a stable structure when fully unfolded.

[0034] like Figure 2 and Figure 3As shown, the bottom shell 1 includes a base 11, side plates 12 disposed on both sides of the base 11 along its length, and a flip cover 13 rotatably disposed on the base 11. The flip cover 13, side plates 12, and base 11 together form a receiving cavity 14. One side of the flip cover 13 along its length is hinged to the base 11, and the opposite side can be provided with a buckle that cooperates with the base 11 so that when the flip cover 13 is closed, it is locked tightly connected to the base 11. The rotating shaft 2 is located inside the receiving cavity 14, and the fixing rod 4 and the lifting support assembly 5 can be placed inside the receiving cavity 14. By setting the receiving cavity 14, a full-concealment design is formed. In the non-working state, all components can be hidden inside the receiving cavity 14, thereby protecting the components and reducing the space occupied, which is convenient for transportation and transfer. The side plate 12 is provided with a support groove 121 on the side near the receiving cavity 14. When the fixing rod 4 is lowered into the receiving cavity 14, both ends of the fixing rod 4 are respectively placed in the support groove 121. The support groove 121 limits the fixing rod 4. When the fixing rod 4 descends into the receiving cavity 14, the support groove 121 at both ends of the receiving cavity 14 limits and constrains the fixing rod 4, which can prevent it from shaking in the receiving cavity 14 and causing the curtain 3 to wrinkle.

[0035] like Figure 5 and Figure 6As shown, the fixing rod 4 includes a hollow first fixing rod 41 and a hollow second fixing rod 42. The first fixing rod 41 is inserted into the second fixing rod 42, which has a fully enclosed circular design. The two can be locked together to restrict relative movement. The side wall of the first fixing rod 41 has a first slot 411 along the axial direction, and the side wall of the second fixing rod 42 has a second slot 421 corresponding to the first slot 411. The double-rod nested structure enhances the strength of the fixing rod 4. Furthermore, the first fixing rod 41 and the second fixing rod 42 can be replaced individually. If one is damaged, only the damaged part needs to be replaced, reducing operating costs. One end of the screen 3 can be embedded in the first slot 411 to be fixedly connected to the first fixing rod 41. The length of the first fixing rod 41 is not less than the width of the screen 3, which helps improve the flatness of the screen 3 in the unfolded state, thus improving projection quality. The hollow inner cavity of the first fixing rod 41 is provided with a reinforcing rib 412. The reinforcing rib 412 is in the shape of a straight line and is connected to the inner wall of the inner cavity of the first fixing rod 41. It can not only improve the axial rigidity of the first fixing rod 41 to avoid deformation, but also prevent the tube wall from deforming due to radial external force, causing deformation of the first slot 411. The outer periphery of the first fixing rod 41 is provided with a limiting groove 413 along the axis. The inner wall of the second fixing rod 42 is provided with a limiting protrusion 422 corresponding to the limiting groove 413. The limiting groove 413 and the limiting protrusion 422 engage with each other to form a limiting structure between the first fixing rod 41 and the second fixing rod 42. This can prevent rotation between the two and ensure that the first slot 411 and the second slot 421 are aligned. It can also ensure that the first slot can be vertically downward after the first fixing rod and the second fixing rod are nested together, so as to facilitate the connection between the curtain 3 and the first fixing rod 41. The second fixed rod 42 is provided with a handle 43. The two ends of the handle 43 are rotatably connected to the second fixed rod 42. The handle 43 is located in the middle of the second fixed rod 42, which can provide a gripping base for the second fixed rod 42 and improve the ease of operation of pulling the fixed rod 4.

[0036] In other possible embodiments, the second fixing rod 42 may adopt a non-full-circle design, such as... Figure 7 and Figure 8 As shown, the second fixing rod 42 adopts a semi-circular design, and the first fixing rod 41 and the second fixing rod 42 are fixedly connected by riveting.

[0037] The lifting screen provided in this embodiment achieves stable lifting and lowering support for the screen 3 through a lifting support assembly 5 composed of multi-stage linkages. A hinged system consisting of a first link 51, two parallel second links 52, and a third link 53 forms a composite lever-parallelogram hybrid mechanism, effectively dispersing the torque caused by the screen's gravity. The design of the two parallel second links 52 can counteract lateral torque, preventing lateral displacement of the screen 3 during lifting. The pneumatic strut 54 is a telescopic mechanism with a certain resistance during extension and retraction. The linkage design between the pneumatic strut 54 and the first link 51 achieves adaptive support. One end of the pneumatic strut 54 is hinged to the first link 51, and the other end is hinged to the bottom shell 1, thus enabling the lifting support assembly 5 to have a braking function during folding and unfolding, which helps to enhance the structural stability of the lifting support assembly 5 and reduce vibration during movement. The pneumatic strut 54 allows the lifting support assembly 5 to unfold and fold under external force and maintain a stable posture after the external force disappears. When the curtain 3 needs to be unfolded, the fixing rod 4 can be manually pulled up to increase the distance between the fixing rod 4 and the bottom shell 1, thereby enabling the curtain 3 to be unfolded. The lifting support assembly 5 provides stable support for the curtain 3.

[0038] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 utility model 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 utility model.

[0039] Furthermore, the terms "first," "second," etc., 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, the inclusion of "first," "second," etc., in a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A retractable screen, characterized in that, include: The system includes a base shell, a rotating shaft rotatably mounted on the base shell, and a curtain that can be wound around the rotating shaft. One end of the curtain is connected to the rotating shaft, and the other end is provided with a fixed rod. At least one set of lifting support components is provided on the base shell. The lifting support components include a pneumatic strut, a first connecting rod, two parallel second connecting rods, and a third connecting rod. The first connecting rod, the two parallel second connecting rods, and the third connecting rod are sequentially hinged between the base shell and the fixed rod. One end of the pneumatic strut is hinged to the base shell, and the other end is hinged to the first connecting rod.

2. The lifting screen according to claim 1, characterized in that, Both ends of the two second links are provided with hinge joints. One of the second links is hinged to the first link, and the hinge joint of the second link is hinged to the first link, forming a limiting structure with the first link. The other second link is hinged to the third link, and the hinge joint of the second link is hinged to the third link, forming a limiting structure with the third link.

3. The lifting screen according to claim 1, characterized in that, The bottom shell includes a base, side plates disposed on both sides of the base along its length, and a flip cover rotatably disposed on the base. The flip cover, side plates, and base together form a receiving cavity. The rotating shaft is located inside the receiving cavity, and the fixing rod and lifting support assembly can be placed inside the receiving cavity.

4. The lifting screen according to claim 3, characterized in that, The side plate is provided with a support groove on the side near the receiving cavity. When the fixing rod is lowered into the receiving cavity, both ends of the fixing rod are respectively placed in the support groove.

5. The lifting screen according to claim 1, characterized in that, The fixing rod includes a hollow first fixing rod and a hollow second fixing rod. The first fixing rod is inserted into the second fixing rod, and a first slot is formed on the side wall of the first fixing rod along the axial direction.

6. The lifting screen according to claim 5, characterized in that, The hollow inner cavity of the first fixing rod is provided with reinforcing ribs.

7. The lifting screen according to claim 5, characterized in that, The first fixing rod has a limiting groove along its outer periphery, and the second fixing rod has a limiting protrusion corresponding to the limiting groove on its inner wall.

8. The lifting screen according to claim 5, characterized in that, The second fixed rod is provided with a handle, and the two ends of the handle are rotatably connected to the second fixed rod.

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