Electric floor-pull projection screen

Abstract

This invention relates to the field of projection screens, and particularly to an electrically operated floor-mounted projection screen, comprising at least two telescopic frames, each having an active end and a driven end, with the active ends of adjacent telescopic frames connected by a tension spring; a first roller tube located on the side of the telescopic frames, containing a power component for driving the first roller tube to rotate; and a first screen, one end connected to the first roller tube and the other end connected to the driven end of the telescopic frames. When the telescopic frames expand under force, they support the first screen. When the first screen needs to be rolled up, the power component drives the first roller tube to rotate, winding the first screen onto the first roller tube. When the first screen needs to be unfolded again, the power component is reversed, and the tension spring, under its own rebound force, pulls the telescopic frames to expand, thus unfolding the first screen. This projection screen, by combining the power component with the tension spring to control the rolling up or unfolding of the first screen, is more convenient and faster to use.

Description

Technical Field

[0001] The invention is used in the field of projection screens, and in particular relates to an electric floor-pull projection screen. Background Art

[0002] Existing projection screens generally adopt a manual structure, and are usually rolled up and pulled manually, which is inconvenient to use. Summary of the invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide an electric pull-up projection screen that can realize automatic pull-up and roll-up of the screen, which is convenient and quick to use.

[0004] The technical solution adopted by the present invention to solve the technical problem is: an electric floor-pull projection screen, comprising

[0005] At least two telescopic frames are provided, each of which has an active end and a passive end, and the active ends of two adjacent telescopic frames are connected by a tension spring, and the tension spring applies a force to expand the telescopic frame;

[0006] A first winding tube, arranged on the side of the telescopic frame, wherein a power component for driving the first winding tube to rotate is arranged inside the first winding tube;

[0007] The first curtain has one end connected to the first coiled tube and the other end connected to the driven end of the telescopic frame.

[0008] The above technical solution has at least the following advantages or beneficial effects: the tension spring applies force to the telescopic frame, and the telescopic frame expands under the force to prop up the first curtain. When the first curtain needs to be rolled up, the power component is started, and the power component drives the first winding tube to rotate to roll the first curtain on the first winding tube. Since the telescopic frame is contracted when the first curtain is rolled on the first winding tube, and the contraction of the telescopic frame will stretch the tension spring, the next time the first curtain needs to be opened, the power component is directly reversed. At this time, the tension spring will pull the telescopic frame to expand under the action of its own rebound force to open the first curtain. Since this projection screen combines the power component with the tension spring to control the rolling or opening of the first curtain, it is more convenient and quick to use.

[0009] As a further improvement of the technical solution of the present invention, a second curtain is provided on the side of the telescopic frame opposite to the first curtain, a second roller tube is provided on the side of the telescopic frame, a coil spring is provided inside the second roller tube, one end of the second curtain is connected to the second roller tube, and the other end is connected to the driven end of the telescopic frame.

[0010] As a further improvement of the technical solution of the present invention, a top plate is provided at one end of the telescopic frame, and a bottom plate is provided at the other end of the telescopic frame. The telescopic frame includes two connecting rods that are cross-hinged with each other, wherein the two ends of one of the connecting rods are rotatably connected to the top plate and the bottom plate respectively, and the two ends of the other connecting rod are slidably connected to the top plate and the bottom plate respectively, and the connecting rod is slidably connected to one end of the bottom plate and is connected to the tension spring.

[0011] As a further improvement of the technical solution of the present invention, slide rails are installed on opposite sides of the top plate and the bottom plate, and both ends of the connecting rod slidably connecting the top plate and the bottom plate are respectively assembled in each of the slide rails through pulleys.

[0012] As a further improvement of the technical solution of the present invention, the sliding ends of two adjacent connecting rods are connected by the same tension spring.

[0013] As a further improvement of the technical solution of the present invention, a plurality of tension springs are provided on the bottom plate, and the sliding end of each connecting rod is correspondingly connected to one end of a tension spring, and the other end of the tension spring is connected to the bottom plate.

[0014] As a further improvement of the technical solution of the present invention, an adjustment buckle is provided on the bottom plate, and the adjustment buckle has a plurality of baffles arranged at intervals along the expansion and contraction direction of the tension spring, and the tension spring is buckled and connected to the baffles.

[0015] As a further improvement of the technical solution of the present invention, it also includes a pull rope and a fixed pulley, wherein the fixed pulley is installed on the base plate and is located at one end of the slide rail away from the tension spring, the pull rope passes around the fixed pulley, one end of the pull rope is connected to the tension spring, and the other end is connected to the sliding end of the connecting rod.

[0016] As a further improvement of the technical solution of the present invention, the pull rope is snap-connected to the tension spring.

[0017] As a further improvement of the technical solution of the present invention, brackets are installed at both ends of the bottom plate, both ends of the first coiled tube are fixed between the two brackets, and both ends of the second coiled tube are fixed between the two brackets. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A schematic diagram of the internal structure of the illustrated embodiment;

[0021] Figure 3 yes Figure 1 an exploded view of the illustrated embodiment;

[0022] Figure 4 yes Figure 1 A partial structural schematic diagram of the embodiment shown;

[0023] Figure 5 yes Figure 1 A schematic diagram of the same tension spring disposed between two telescopic frame brackets in the illustrated embodiment;

[0024] Figure 6 is a schematic structural diagram of a double-screen projection screen in one embodiment of the present invention;

[0025] Figure 7 yes Figure 6 an exploded view of the illustrated embodiment;

[0026] Figure 8 yes Figure 6 A partial structural schematic diagram of the embodiment shown;

[0027] Fig. 9 yes Figure 6 A schematic diagram of two tension springs being arranged between two telescopic frames in the illustrated embodiment;

[0028] Fig.10 yes Figure 8 A partial enlarged view of the middle A;

[0029] Fig.11 It is a schematic structural diagram of a telescopic frame in one embodiment of the present invention. DETAILED DESCRIPTION

[0030] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0031] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0032] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0034] See also Figure 1 to Figure 4 The present invention provides an electric floor-pull projection screen, which mainly includes a telescopic frame 1, a first roller tube 2 and a first curtain 3, wherein at least two telescopic frames 1 are provided, the telescopic frames 1 have an active end and a driven end, the active ends of two adjacent telescopic frames 1 are connected by a tension spring 4, the tension spring 4 applies a force to expand the telescopic frames 1, the first roller tube 2 is provided on the side of the telescopic frame 1, and a power component 200 for driving the first roller tube 2 to rotate is provided in the first roller tube 2, one end of the first curtain 3 is connected to the first roller tube 2, and the other end is connected to the driven end of the telescopic frame 1.

[0035] The tension spring 4 applies force to the active end of the telescopic frame 1, and the active end moves under the force, so that the driven end of the telescopic frame 1 rises to prop up the first curtain 3. When the first curtain 3 needs to be rolled up, the power component 200 is started, and the power component 200 drives the first winding tube 2 to rotate to roll the first curtain 3 on the first winding tube 2. Since the telescopic frame 1 is contracted when the first curtain 3 is rolled on the first winding tube 2, and the contraction of the telescopic frame 1 will stretch the tension spring 4, the next time the first curtain 3 needs to be opened, the power component 200 is reversed. At this time, the tension spring 4 will pull the telescopic frame 1 to expand under the action of its own resilience to open the first curtain 3. Since this projection screen combines the power component 200 with the tension spring 4 to control the rolling or opening of the first curtain 3, it is more convenient and quick to use.

[0036] See also Figure 1 , Figure 2 , Figure 3A top plate 100 is provided at one end of the telescopic frame 1, and a bottom plate 103 is provided at the other end of the telescopic frame 1. The telescopic frame 1 includes two connecting rods 101 that are cross-hinged with each other, wherein the two ends of one connecting rod 101 are rotatably connected to the top plate 100 and the bottom plate 103 respectively, and the two ends of the other connecting rod 101 are slidably connected to the top plate 100 and the bottom plate 103 respectively. One end of the connecting rod 101 is slidably connected to the bottom plate 103 and is connected to the tension spring 4.

[0037] Slide rails 105 are installed on opposite sides of the top plate 100 and the bottom plate 103 . For the connecting rod 101 slidably connecting the top plate 100 and the bottom plate 103 , both ends thereof are respectively assembled in the slide rails 105 through pulleys.

[0038] It should be noted that the active end of the telescopic frame 1 mentioned in the present application is one end of the connecting rod 101 slidingly connected to the bottom plate 103, that is, the bottom end of the telescopic frame 1, and the driven end of the telescopic frame 1 is the end of the telescopic frame 1 that is lifted and lowered, that is, the top end of the telescopic frame 1.

[0039] When the first curtain 3 is rolled up, the power component 200 drives the first reel 2 to rotate, so that the first curtain 3 is rolled onto the first reel 2. At the same time, under the pulling of the first curtain 3, the two ends of the connecting rod 101 for sliding slide to the right in the slide rail 105, and the other connecting rod 101 is driven, so that the two connecting rods 101 cross and overlap each other. When the first curtain 3 needs to be pulled up, the power component 200 rotates in the opposite direction. Under the rebound force of the tension spring 4, the two ends of the connecting rod 101 slide to the left in the slide rail 105, and the other connecting rod 101 is driven, so that the two connecting rods 101 cross and stand up, thereby pulling up the first curtain 3.

[0040] See also Fig.11 It should be noted that the connecting rod 101 in the present invention includes two straight rods 102 hinged at both ends, and the middle part of the straight rod 102 of each connecting rod 101 is hinged through a rotating shaft.

[0041] See also Figure 3 , Figure 5 In some embodiments, the sliding ends of two adjacent connecting rods 101 are connected by the same tension spring 4, that is, the sliding ends of the two connecting rods 101 are pulled against each other by the same tension spring 4. When the first curtain 3 is rolled up, the sliding ends of the two connecting rods 101 simultaneously apply tension to both ends of the tension spring 4 to stretch the tension spring 4. When the first curtain 3 needs to be pulled up, the sliding end of the connecting rod 101 slides to the left under the action of the rebound force of the tension spring 4 to drive the connecting rod 101 and the driven rod 102 to hold up the curtain.

[0042] See also Figure 4 , Figure 8 , Fig. 9In some other embodiments, a plurality of tension springs 4 are disposed on the bottom plate 103, and the sliding end of each connecting rod 101 is connected to one end of a tension spring 4, and the other end of the tension spring 4 is connected to the bottom plate 103. Figure 8 In the illustrated embodiment, two tension springs 4 are provided on the bottom plate 103, and each tension spring 4 corresponds to a telescopic frame 1. When the curtain is rolled up, each tension spring 4 is stretched under the drive of the sliding end of the corresponding connecting rod 101. When the curtain is pulled up, each tension spring 4 pulls the sliding end of the corresponding connecting rod 101 under the action of the rebound force to support the connecting rod 101 and the driven rod 102.

[0043] In some other embodiments, the present application also includes a pull rope 6 and a fixed pulley 7. The fixed pulley 7 is installed on the base plate 103 and is located at one end of the slide rail 105 away from the tension spring 4. The pull rope 6 passes around the fixed pulley 7. One end of the pull rope 6 is connected to the tension spring 4, and the other end is connected to the sliding end of the connecting rod 101.

[0044] For details, see Figure 2 to Figure 9 A slide rail 105 fixed to the bottom plate 103 is provided on the lower side of each telescopic frame 1, and the slide rail 105 extends along the length direction of the bottom plate 103. One end of the connecting rod 101 is assembled in the slide rail 105 through a roller. When the two telescopic frames 1 are connected by the same tension spring 4, the tension spring 4 is arranged between the two slide rails 105, and the fixed pulley 7 is fixed on the bottom plate 103 and located at the end of the slide rail 105 away from the tension spring 4. In order to ensure that the pull rope 6 and the slide rail 105 remain level, in the present invention, the fixed pulley 7 is aligned with the slide rail 105, one end of the pull rope 6 is connected to the tension spring 4, and the other end is connected to the sliding end of the connecting rod 101 after passing around the fixed pulley 7.

[0045] See also Figure 8 , Fig. 9 When the two telescopic frames 1 are connected by two tension springs 4, two tension springs 4 are arranged between the two telescopic frames 1, and each tension spring 4 is connected to a corresponding telescopic frame 1. Specifically, one end of the tension spring 4 is connected to the bottom plate 103, and the other end bypasses the fixed pulley 7 and is connected to the sliding end of the corresponding connecting rod 101.

[0046] It should be noted that, in the embodiment where two tension springs 4 are arranged between the two telescopic frames 1, the positions of the two tension springs 4 are not aligned with the slide rail 105, but are located on both sides of the slide rail 105, and the fixed pulley 7 is aligned with the slide rail 105. If the pull rope 6 is directly passed around the fixed pulley 7 and connected to the sliding end of the connecting rod 101, the pull rope 6 is obliquely wound around the fixed pulley 7. In order to prevent the pull rope 6 from being obliquely wound around the fixed pulley 7, in the present invention, two rotating wheels are arranged on the side of the fixed pulley 7, one of which is aligned with the tension spring 4, and the other is aligned with the fixed pulley 7, and the two rotating wheels are also aligned. In this way, when the pull rope 6 passes around the two rotating wheels in succession and then is wound around the fixed pulley 7, it will remain in the positive direction in the groove of the fixed pulley 7 and will not be tilted.

[0047] In addition, see Figure 4 In the present invention, the pull rope 6 and the tension spring 4 are connected by a snap connection. Specifically, one end of the tension spring 4 used to connect the pull rope 6 is provided with a hook, and the other end of the pull rope 6 used to connect the tension spring 4 is provided with a snap ring. When in use, the hook and the snap ring can be directly connected, which is convenient for assembly, disassembly and replacement.

[0048] See also Figure 5 , Figure 6 In some embodiments, a second curtain 5 is installed on the side of the telescopic frame 1 opposite to the first curtain 3, a second roller tube 106 is provided on the side of the telescopic frame 1, a coil spring 107 is provided inside the second roller tube 106, one end of the second curtain 5 is connected to the second roller tube 106, and the other end is connected to the driven end of the telescopic frame 1, thereby forming a double curtain structure, which makes the utilization area of ​​the curtain larger.

[0049] When the curtain is stretched, the second curtain 5 will be pulled up under the stretching action of the telescopic frame 1, and the pulled up second curtain 5 will drive the coil spring 107 to tighten. When the curtain is rolled up, the second curtain 5 will automatically roll onto the second rolling tube 106 under the rebound force of the coil spring 107.

[0050] It is understandable that the first screen 3 and the second screen 5 can be arranged on both sides of the telescopic frame 1 pulled by the same tension spring 4, or can be arranged on both sides of the telescopic frame 1 connected by two tension springs 4, thereby forming a double-sided projection screen.

[0051] Similarly, a first curtain 3 is arranged on one side of the telescopic frame 1 pulled by the same tension spring 4, or a first curtain 3 is arranged on one side of the telescopic frame 1 connected by two tension springs 4, thereby forming a single-sided projection screen.

[0052] For further information, see Figure 8 , Fig.10An adjusting buckle 8 is provided on the bottom plate 103. The adjusting buckle 8 has a plurality of baffles 70 arranged at intervals along the extension and retraction direction of the tension spring 4. The tension spring 4 is snap-connected with the baffles 70. The tightness of the tension spring 4 can be adjusted by the adjusting buckle 8. The tension spring 4 will become loose after long-term use. In this way, the tension spring 4 can be buckled onto a baffle 70 farther away to keep the tension spring 4 taut, thereby providing sufficient force for supporting the telescopic frame 1.

[0053] See also Figure 2 , Figure 6 , brackets 108 are installed at both ends of the bottom plate 103 , both ends of the first coiled tube 2 are fixed between the two brackets 108 , and both ends of the second coiled tube 106 are fixed between the two brackets 108 .

[0054] In addition, if Figure 3 As shown, a front baffle 120, a rear baffle 124, a left baffle 121, a right baffle 123 and an upper baffle 126 are also installed on the bottom plate 103 to form a box body, wherein the upper baffle 126 has an avoidance groove 127 opened along the length direction. On the one hand, the avoidance groove 127 provides an inlet and outlet channel for the telescopic frame 1 and the first curtain 3, and on the other hand, it can also cooperate with the top plate 100. When the first curtain 3 is rolled up, the top plate 100 will block the avoidance groove 127 to prevent external impurities from entering the box body.

[0055] Of course, for a double-sided projection screen, the avoidance groove 130 provides an inlet and outlet passage for the telescopic frame 1 , the first screen 3 and the second screen 5 .

[0056] Of course, the present application is not limited to the above-mentioned implementation modes, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. An electric floor-mounted projection screen, characterized in that: include At least two telescopic frames (1) are provided, the telescopic frames (1) having an active end and a passive end, the active ends of two adjacent telescopic frames (1) being connected via a tension spring (4), the tension spring (4) applying a force to expand the telescopic frames (1); A first rolling tube (2) is arranged on a side of the telescopic frame (1), and a power component (200) is arranged inside the first rolling tube (2) for driving the first rolling tube (2) to rotate; A first curtain (3), one end of which is connected to the first coiled tube (2), and the other end of which is connected to the driven end of the telescopic frame (1); Wherein, a top plate (100) is provided at one end of the telescopic frame (1), and a bottom plate (103) is provided at the other end of the telescopic frame (1), and the telescopic frame (1) comprises two connecting rods (101) that are cross-hinged with each other, wherein two ends of one of the connecting rods (101) are rotatably connected to the top plate (100) and the bottom plate (103), respectively, and two ends of the other connecting rod (101) are slidably connected to the top plate (100) and the bottom plate (103), and one end of the connecting rod (101) is slidably connected to the bottom plate (103) and is connected to the tension spring (4); Slide rails (105) are installed on opposite sides of the top plate (100) and the bottom plate (103); both ends of the connecting rod (101) that slidably connects the top plate (100) and the bottom plate (103) are respectively assembled in the slide rails (105) through pulleys; The sliding ends of two adjacent connecting rods (101) are connected via the same tension spring (4); It also includes a pull rope (6) and a fixed pulley (7), wherein the fixed pulley (7) is mounted on the bottom plate (103) and is located at one end of the slide rail (105) away from the tension spring (4), and the pull rope (6) passes around the fixed pulley (7). One end of the pull rope (6) is connected to the tension spring (4), and the other end is connected to the sliding end of the connecting rod (101).

2. The electric floor-pull projection screen according to claim 1, characterized in that: A second curtain (5) is provided on a side of the telescopic frame (1) opposite to the first curtain (3); a second rolling tube (106) is provided on the side of the telescopic frame (1); a coil spring (107) is provided inside the second rolling tube (106); one end of the second curtain (5) is connected to the second rolling tube (106), and the other end is connected to the driven end of the telescopic frame (1).

3. The electric floor-pull projection screen according to claim 1, characterized in that: A plurality of tension springs (4) are provided on the bottom plate (103); the sliding end of each connecting rod (101) is correspondingly connected to one end of a tension spring (4); and the other end of the tension spring (4) is connected to the bottom plate (103).

4. The electric floor-pull projection screen according to claim 3, characterized in that: An adjustment buckle (8) is provided on the bottom plate (103), the adjustment buckle (8) having a plurality of retaining bars (70) arranged at intervals along the extension and retraction direction of the tension spring (4), the tension spring (4) being buckledly connected to the retaining bars (70).

5. The electric floor-pull projection screen according to claim 1, characterized in that: The pull rope (6) is snap-connected to the tension spring (4).

6. The electric floor-pull projection screen according to claim 2, characterized in that: Brackets (108) are installed at both ends of the bottom plate (103), the two ends of the first coiled tube (2) are fixed between the two brackets (108), and the two ends of the second coiled tube (106) are fixed between the two brackets (108).

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