Self-tightening quick-release double-sided picture frame

Abstract

The application discloses a self-tightening quick-release double-sided picture frame and belongs to the technical field of picture frames. The frame body is provided with picture plates on the front and back surfaces. The upper part of the inner side wall of the frame body is provided with an installation space. A locking unit is arranged in the installation space and movably arranged in the installation space, so that the locking unit can act on the side wall of the picture plate. Two through holes are formed in the upper end of the frame body. Two free ends of a hanging rope are respectively inserted into the two through holes and fixedly connected with the locking unit. When the hanging rope is lifted, the locking unit is driven to fix the picture plate in the frame body. The self-tightening quick-release double-sided picture frame synchronously fixes the double-sided picture plate through the linkage of the hanging rope and the locking unit. The lever principle or elastic potential energy is utilized to realize quick locking and releasing. The problems of easy failure and complicated operation of the traditional fixing mode are solved. The self-tightening quick-release double-sided picture frame has the characteristics of single-action control of double-sided fixing, compact structure and high reliability.

Description

Technical Field

[0001] This invention belongs to the field of picture frame technology, and particularly relates to a self-tightening quick-release double-sided picture frame. Background Technology

[0002] Double-sided picture frames, as a unique display tool, typically consist of a frame body and two panels, one on the front and one on the back. Their design aims to display different paintings or content on the two sides of the same frame, greatly increasing the diversity and flexibility of displays. They are widely used in various settings such as gallery exhibitions and home décor.

[0003] In existing double-sided picture frames, there are various ways to fix the canvas to the frame. Common methods include using Velcro, where male and female Velcro are attached to the edges where the canvas and frame meet, and the canvas is fixed by the adhesive properties of the Velcro; there are also simple snap-on structures, where multiple snaps are set around the frame to embed the edges of the canvas into the snaps for fixation; some frames also use magnetic tabs and positioning magnets for adsorption, as well as positioning rods and through holes or positioning holes for insertion and cooperation.

[0004] In practical use, canvases may require frequent disassembly and replacement. For example, in gallery settings, the artwork within the frames needs frequent replacement to adapt to changes in exhibition themes or the need for updated exhibits; in commercial space decoration, the displayed content often needs to be changed quickly to match different marketing activities or seasonal atmospheres. However, existing fixing methods have significant shortcomings. Taking Velcro fixing as an example, after repeated disassembly and assembly, the adhesive of the Velcro gradually weakens, causing the canvas to become unstable and potentially wobble or even fall during display, affecting the display effect and the safety of the artwork. For simple snap-on structures, multiple fixing points often require manual operation. During installation, the edges of the canvas must be accurately inserted into the snaps one by one, and during disassembly, each snap must be opened sequentially, making the entire process cumbersome and time-consuming. Moreover, current technology makes it difficult to quickly fix and release two canvases simultaneously, resulting in low operational efficiency when quick artwork replacement is required.

[0005] To address this issue, we propose a self-tightening, quick-release double-sided picture frame. Summary of the Invention

[0006] The purpose of this invention is to solve the problem that existing technologies using fasteners such as Velcro cannot meet the frequent disassembly and assembly requirements of double-sided picture frames, and to propose a self-tightening quick-release double-sided picture frame.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A self-tightening quick-release double-sided picture frame includes a frame body, on which picture boards are mounted on both the front and back sides. The upper part of the inner wall of the frame body has an installation space, within which are provided:

[0009] A locking unit is movably installed within the installation space, enabling the locking unit to act on the side wall of the drawing board;

[0010] The frame has two through holes at its upper end. The two free ends of the hanging rope pass through the two through holes and are fixedly connected to the locking unit. When the hanging rope is lifted, it drives the locking unit to fix the drawing board in the frame.

[0011] Preferably, the locking unit is rotatably connected within the installation space, and two sets of the locking unit are provided;

[0012] The locking unit has a first working part and a second working part, which are located on both sides of the rotation center, so that the first working part and the second working part form a lever structure around the rotation center.

[0013] The two free ends of the hanging rope are respectively fixedly connected to the upper side wall of the first action part of the two sets of locking units. When the hanging rope drives the first action part to move upward, the second action part moves downward and acts on the side wall of the drawing board.

[0014] Preferably, the rotation axis of the locking unit is parallel to the frame, so that the locking unit can rotate in a plane perpendicular to the frame;

[0015] The two sets of locking units are respectively located on both sides of the vertical center line of the frame;

[0016] When the hanging rope moves the first working parts of the two sets of locking units upwards simultaneously, the second working parts of the two sets of locking units act on the upper sidewalls of the front and back drawing boards respectively.

[0017] Preferably, the rotation axis of the locking unit is perpendicular to the frame, so that the locking unit can rotate in the same plane as the frame;

[0018] The two sets of locking units are symmetrically arranged about the vertical center line of the frame;

[0019] Furthermore, the locking unit is positioned at the center of the frame thickness direction. When the hanging rope moves the first action part of the two sets of locking units upward, the second action part can act simultaneously on the upper side wall of both the front and back drawing boards.

[0020] Preferably, the locking unit is a rotating plate, and a horizontally arranged rotating shaft is fixedly connected to the side wall of the rotating plate. The rotating shaft is parallel to the plate surface, and the other end of the rotating shaft is rotatably connected to the side wall of the installation space. The two ends of the rotating plate are respectively the first working part and the second working part.

[0021] The free end of the hanging rope is fixedly connected to one end of the rotating plate, and the other end of the rotating plate is chamfered.

[0022] Preferably, the rotating shaft is positioned close to the first working part, such that the distance from the free end of the hanging rope to the rotating shaft is less than the distance from the other end of the rotating plate to the rotating shaft.

[0023] Preferably, the locking unit is a cam, a portion of the cam's peripheral sidewall is a first working part, the portion of the cam away from the first working part extends forward to form a second working part, the free end of the hanging rope is fixedly connected to the upper end of the second working part, a horizontally arranged rotating shaft is fixedly connected to the end sidewall of the cam, the rotating shaft is perpendicular to the sidewall of the cam, and the other end of the rotating shaft is rotatably connected to the sidewall of the installation space.

[0024] Preferably, the locking unit is a pressure block, which is vertically slidably installed in the installation space. Fixed pulleys are provided on both sides of the pressure block, and the fixed pulleys are installed on the side wall of the installation space. The free end of the hanging rope passes under the fixed pulley and is fixedly connected to the lower end of the pressure block. When the hanging rope is lifted, the free end of the hanging rope pulls the pressure block downward and acts on the upper side wall of the drawing board.

[0025] Preferably, the locking unit is rotatably connected within the installation space, and two sets of the locking unit are provided; the rotation axis of the locking unit is perpendicular to the frame, allowing the locking unit to rotate within the same plane of the frame; the two sets of the locking unit are respectively located on both sides of the vertical centerline of the frame;

[0026] The locking unit is a locking element, and the locking element includes:

[0027] A rotating body, on which a rotating shaft is fixedly connected, the rotating shaft being rotatably connected to the side wall of the installation space, and the free end of the hanging rope being fixedly connected to one end of the rotating body;

[0028] A locking bar is fixedly connected to one end of the rotating body away from the connection point of the hanging rope, and the locking bar is perpendicular to the rotating body;

[0029] A wedge-shaped strip is fixedly connected to one end of the rotating body near the hanging rope connection point, and the width of the wedge-shaped strip gradually narrows from the rotating body outwards;

[0030] A torsion spring is installed between the rotating shaft and the installation space. When the free end of the hanging rope drives the rotating body to rotate upward, the torsion spring deforms and stores elastic potential energy. When the elastic potential energy is released, the wedge strip rotates downward with the rotating body and is inserted between the front and back drawing boards, causing the two drawing boards to move outward from the frame.

[0031] Preferably, the upper end of the wedge-shaped strip is also provided with a clearance surface.

[0032] In summary, the technical effects and advantages of this invention are as follows: This self-tightening quick-release double-sided picture frame synchronously fixes the double-sided picture boards through a rope linkage locking unit, and uses the lever principle or elastic potential energy to achieve rapid locking and releasing, solving the problems of easy failure and cumbersome operation of traditional fixing methods. It has the characteristics of single-action control for double-sided fixing, compact structure and high reliability. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 This is an exploded view of the invention;

[0035] Figure 3 This is a schematic diagram of the locking unit in this invention. Figure 1 ;

[0036] Figure 4 This is a schematic diagram of the locking unit in this invention. Figure 2 ;

[0037] Figure 5 This is a schematic diagram of the locking unit in this invention. Figure 3 ;

[0038] Figure 6 This is a schematic diagram of the locking unit in this invention. Figure 4 ;

[0039] Figure 7 This is a schematic diagram of the locking component in this invention.

[0040] In the diagram: 1. Frame; 2. Drawing board; 3. Hanging rope; 4. Rotating plate; 5. Cam; 6. Pressure block; 7. Fixed pulley; 8. Locking element;

[0041] 81. Rotating body; 811. Rotating shaft; 812. Torsion spring; 82. Locking bar; 83. Wedge bar; 831. Yielding surface. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0043] In existing technologies, double-sided picture frames generally consist of a frame and two panels, typically secured with Velcro. However, Velcro's adhesive strength tends to weaken over time, leading to insecure panel mounting. Changing panels requires repeatedly tearing and untying the Velcro, a cumbersome process that can damage the panel surface. For example, in exhibition settings where content is frequently changed, traditional structures are not only time-consuming but also struggle to maintain panel flatness.

[0044] To address the aforementioned issues, a fixing structure that does not rely on adhesive materials needs to be designed. Considering that mechanical linkage devices can achieve rapid locking and releasing through action conversion, an attempt was made to convert the lifting action into the mechanical movement of the internal locking unit. Further investigation revealed that by setting a movable locking unit inside the frame and triggering its movement via an external hanging rope, the mechanical structure can be concealed to maintain a clean appearance, while the self-tightening principle can enhance the fixing stability.

[0045] Therefore, this application proposes the following solution: Figures 1-7 As shown, a self-tightening quick-release double-sided picture frame includes a frame body 1, with picture boards 2 installed on both the front and back sides of the frame body 1. A baffle is fixedly connected in the middle of the frame body 1 to limit the insertion depth of the picture boards 2, so that the two picture boards 2 can be restricted in their installation positions. The upper part of the inner wall of the frame body 1 has an installation space, wherein the installation space refers to the groove or cavity structure set in the upper part of the inner wall of the frame body, which can be realized by injection molding or splicing assembly.

[0046] The installation space includes:

[0047] The locking unit is movable within the installation space, allowing it to act on the side wall of the drawing board 2.

[0048] The hanging rope 3 has two through holes at the upper end of the frame 1. The two free ends of the hanging rope 3 pass through the two through holes and are fixedly connected to the locking unit. Specifically, the hanging rope 3 can be a nylon rope or a metal chain. When the hanging rope 3 is lifted, it is used to drive the locking unit to fix the drawing board 2 in the frame 1.

[0049] The working principle is as follows: First, place the two canvases 2 into the frame 1 from opposite sides, ensuring the inner walls of the canvases 2 act on the baffles to guarantee proper installation. Then, ensure the lower wall of the canvases 2 contacts the lower inner wall of the frame 1. When the hanging rope 3 is pulled upwards and hung on the wall, its free end transmits tension into the installation space through the through hole, causing the locking unit to shift or rotate. Under the driving force, the locking unit's end contacts the upper wall of the canvases 2 and applies pressure, pressing the canvases 2 firmly inside the frame 1. At this point, a self-tightening state is formed between the locking unit and the canvases 2. The greater the external force, the stronger the clamping force. This external force mainly comes from the weight of the canvases 2 and the frame 1 itself, thus providing better fixation for larger frames. When it is necessary to replace the canvases 2, simply remove the frame from the wall. The hanging rope 3 automatically releases, and the locking unit resets, releasing the constraint on the canvases 2 for quick removal. The entire process requires no adhesive materials, and the operation is simplified to a single lifting step.

[0050] The beneficial effects are as follows: Compared with existing technologies, traditional Velcro relies on chemical adhesion for fixation, which is easily affected by environmental humidity and may lead to failure. This solution, however, uses a purely mechanical structure to achieve physical locking, and its stability is not affected by material aging. Furthermore, replacing the canvas 2 with Velcro requires peeling it off point by point, which is inefficient and may damage the image, a problem particularly prominent with large frames. This solution, however, allows for simultaneous release of the constraints on both canvas 2 by pulling the hanging rope 3, improving replacement efficiency. This structure is especially suitable for commercial scenarios that require frequent changes to the displayed content, significantly reducing the time required for each replacement while ensuring the stability of the canvas 2.

[0051] Depending on the connection method between the locking unit and the installation space, the following embodiments may be included:

[0052] In one embodiment, the locking unit is rotatably connected within the installation space, and to ensure stability, two sets of locking units are provided, with the two sets of symmetrically arranged locking units able to apply balanced pressure simultaneously.

[0053] The locking unit has a first working part and a second working part. The first working part is the part of the locking unit used to connect with the hanging rope 3, and is used to receive the traction force transmitted by the hanging rope 3. The second working part is the part of the locking unit used to abut against the drawing board 2. The second working part can be implemented by a contact end with a friction surface, used to convert the rotational motion into a pressing force on the drawing board 2.

[0054] The first and second action parts are located on either side of the rotation center. The rotation center refers to the axis of rotation of the locking unit, which can be determined by the center line of the rotation axis, so that the first and second action parts form a lever structure around the rotation center.

[0055] The two free ends of the hanging rope 3 are fixedly connected to the upper side wall of the first action part of the two sets of locking units. When the hanging rope 3 drives the first action part to move upward, the second action part moves downward and acts on the side wall of the drawing board 2.

[0056] The working principle is as follows: When the hanging rope 3 is lifted upward, the free end of the hanging rope 3, fixed to the upper side wall of the first action part, generates an upward traction force. At this time, the first action part rotates upward around the rotation center. Since the first and second action parts are located on both sides of the rotation center, forming a lever structure, the second action part synchronously generates a downward rotational displacement. The second action parts of the two symmetrically arranged locking units act on the upper side walls of the front and back drawing boards 2 respectively, converting the smaller traction force into a larger downward pressure through the lever principle, thereby achieving balanced clamping of the drawing boards. When it is necessary to remove the drawing board 2, the hanging rope 3 is released, and the first action part returns to its downward position under the action of gravity or the elastic reset component. The second action part then moves upward away from the side wall of the drawing board 2, releasing the clamping state.

[0057] In this embodiment, the rotation direction of the locking unit can be perpendicular to or parallel to the plane of the frame 1.

[0058] When the rotation axis of the locking unit is parallel to the frame 1, it means that the rotation direction of the locking unit is perpendicular to the plane of the frame 1, thereby enabling the locking unit to rotate in a plane perpendicular to the frame 1.

[0059] The two sets of locking units are symmetrically arranged about the vertical centerline of the frame 1. This means that the two sets of locking units are arranged in a 180-degree array with the vertical centerline of the frame 1 as the axis of symmetry. Specifically, locking units with the same structure can be used and installed in opposite directions on both sides of the frame 1. In other words, the two sets of through holes and the two sets of rotating shafts need to be set at the front and rear positions inside the frame 1, respectively, and the hanging rope 3 is in a slightly twisted state relative to the frame 1.

[0060] When the hanging rope 3 moves the first working parts of the two sets of locking units upwards simultaneously, the second working parts of the two sets of locking units act on the upper sidewalls of the front and back drawing boards 2 respectively. In other words, the two sets of locking units correspond one-to-one with the two drawing boards 2.

[0061] The above design allows the two drawing boards 2 to be locked or unlocked individually, and one drawing board 2 can be disassembled and assembled separately to suit more usage scenarios. In specific operation, simply loosen one end of the hanging rope 3 connected to the locking unit of the drawing board 2 to be replaced, while the other end still maintains an upward pulling force, so that the single drawing board 2 can be replaced.

[0062] When the rotation axis of the locking unit is perpendicular to the frame 1, it means that the rotation direction of the locking unit is parallel to the plane of the frame 1, thereby enabling the locking unit to rotate within the same plane of the frame 1.

[0063] Two sets of locking units are respectively set on both sides of the vertical center line of the frame 1. That is, the two sets of locking units can be symmetrically arranged about the vertical center line of the frame 1, so that the two ends of the hanging rope 3 are respectively connected to the ends of the two sets of locking units that are close to each other or far apart from each other. At the same time, the two sets of locking units can also be arranged in an array along the width direction of the frame 1, so that the two ends of the hanging rope 3 are respectively connected to the left or right ends of the two sets of locking units.

[0064] The locking unit is positioned centrally along the thickness of the frame 1, ensuring simultaneous contact with both drawing boards 2. When the hanging rope 3 moves the first action of the two locking units upwards, the second action simultaneously acts on the upper sidewalls of both the front and back drawing boards 2, locking or unlocking both boards 2 at the same time.

[0065] In this embodiment, the locking unit can specifically adopt a rotating plate or a cam structure:

[0066] The locking unit is a rotating plate 4. A horizontally arranged rotating shaft is fixedly connected to the side wall of the rotating plate 4. Specifically, it can be achieved by welding a cylindrical metal shaft to the plate body. The rotating shaft is parallel to the plate surface of the rotating plate 4. The other end of the rotating shaft is rotatably connected to the side wall of the installation space. The two ends of the rotating plate 4 are the first action part and the second action part, respectively.

[0067] Furthermore, the rotating shaft is positioned close to the first actuating part, so that the distance from the free end of the hanging rope 3 to the rotating shaft is less than the distance from the other end of the rotating plate 4 to the rotating shaft. Specifically, the torque difference can be achieved by adjusting the length ratio of the two ends, forming an asymmetrical lever structure, so that when the hanging rope 3 pulls the first actuating part, the second actuating part generates a greater downward force.

[0068] The free end of the hanging rope 3 is fixedly connected to one end of the rotating plate 4, and the other end of the rotating plate 4 is chamfered, specifically rounded in this embodiment, so that the rotating plate 4 will not interfere with the upper side wall of the drawing board 2.

[0069] The locking unit is a cam 5. A portion of the sidewall of the cam 5 is the first action part. The portion of the cam 5 away from the first action part extends forward to form the second action part. The free end of the hanging rope 3 is fixedly connected to the upper end of the second action part. A horizontally arranged rotating shaft is fixedly connected to the end sidewall of the cam 5. The rotating shaft is perpendicular to the sidewall of the cam 5. The other end of the rotating shaft is rotatably connected to the sidewall of the installation space.

[0070] Cam 5 refers to a rotating component with a specific profile, which can be made of metal or engineering plastic. The distance from the peripheral sidewall of cam 5 to the rotation axis is gradually varied. The rotation axis is installed perpendicular to the sidewall of cam 5, which can be achieved using bearings or shaft holes to ensure that cam 5 rotates within the thickness plane of frame 1 and accurately transmits force. The second action part connects to the hanging rope 3 to form a power input end, converting the lifting force of the hanging rope 3 into the rotational torque of cam 5. The first action part forms a continuous pressing surface with the gradually varying profile of cam 5, allowing the sidewall of cam 5 to act evenly on the sidewall of drawing board 2 and apply pressure.

[0071] In another embodiment, the locking unit is a pressure block 6, which is vertically slidably installed in the installation space. Fixed pulleys 7 are provided on both sides of the pressure block 6. The fixed pulleys 7 are installed on the side wall of the installation space. The free end of the hanging rope 3 passes under the fixed pulley 7 and is fixedly connected to the lower end of the pressure block 6. When the hanging rope 3 is lifted, the free end of the hanging rope 3 pulls the pressure block 6 downward and acts on the upper side wall of the drawing board 2.

[0072] The pressure block is a rigid component with vertical sliding function, which can be made of metal or high-strength plastic. Its lower end face is set as a plane to increase the contact area with the drawing board 2. The fixed pulley 7 is a guide wheel structure fixed to the side wall of the installation space. It can be a pulley assembly supported by bearings, used to change the direction of force applied by the hanging rope 3 and reduce frictional resistance. The free end of the hanging rope 3 passes around the fixed pulley 7 and connects to the lower end of the pressure block 6, so that when the hanging rope 3 is pulled up, the pulling force can be converted into the downward force of the pressure block 6 through the pulley 1.

[0073] The working principle is as follows: When it is necessary to fix the drawing board 2, the hanging rope 3 is pulled upwards. The free end of the hanging rope 3 passes over the fixed pulley 7 and pulls the pressure block 6 downwards, causing the pressure block 6 to slide vertically and press against the upper edge of the drawing board 2. Because the contact area between the pressure block 6 and the drawing board 2 is large, pressure can be applied evenly to avoid local stress concentration. When it is necessary to disassemble the drawing board 2, simply loosen the hanging rope. The pressure of the pressure block 6 on the drawing board will decrease, or a reset mechanism can be added to move the pressure block 6 upwards and completely separate it from the drawing board 2, thereby releasing the pressing effect on the drawing board 2.

[0074] Finally, to facilitate the removal of the drawing board 2 from the frame 1, this application also includes the following embodiments:

[0075] The locking unit is rotatably connected within the installation space, and two sets of locking units are provided; the rotation axis of the locking unit is perpendicular to the frame 1, so that the locking unit can rotate in the same plane of the frame 1; the two sets of locking units are respectively set on both sides of the vertical center line of the frame 1.

[0076] The locking unit is a locking element 8, which includes:

[0077] A rotating body 81 is fixedly connected to a rotating shaft 811, which is rotatably connected to the side wall of the installation space. The free end of the hanging rope 3 is fixedly connected to one end of the rotating body 81.

[0078] Locking bar 82 is fixedly connected to one end of the rotating body 81 away from the connection point of the hanging rope 3, and the locking bar 82 is perpendicular to the rotating body 81.

[0079] The wedge-shaped strip 83 is fixedly connected to one end of the rotating body 81 near the connection of the hanging rope 3. The width of the wedge-shaped strip 83 gradually narrows from the rotating body 81 outwards.

[0080] Compared with the other solutions mentioned above, this embodiment adds a wedge strip 83. When the locking unit is pulled upward by the hanging rope 3, the locking strip 82 can lock the drawing board 2. When the traction force of the hanging rope 3 is lost, the wedge strip 83 can rotate in the opposite direction and insert between the two drawing boards 2, pushing the drawing board 2 outward toward the frame 1 so that the staff can remove the drawing board 2.

[0081] A torsion spring 812 is installed between the rotating shaft 811 and the mounting space. Specifically, a rotating sleeve is sleeved at the end of the rotating shaft 811, and the rotating sleeve is fixedly connected to the side wall of the mounting space. The rotating shaft 811 and the rotating sleeve are rotatably connected. The two ends of the torsion spring 812 act on the rotating shaft 811 and the rotating sleeve respectively. Therefore, when the rotating shaft 811 rotates, the torsion spring 812 will deform. When the free end of the hanging rope 3 drives the rotating body 81 to rotate upward, the torsion spring 812 deforms and stores elastic potential energy. When the elastic potential energy is released, the wedge strip 83 rotates downward with the rotating body 81 and inserts between the front and back drawing boards 2, causing the two drawing boards 2 to move outward from the frame 1.

[0082] Furthermore, the upper end of the wedge strip 83 is also provided with a relief surface 831, which refers to the inclined structure set at the top of the wedge strip 83, so as to avoid interference between the wedge strip 83 and the top of the installation space when it rotates upward with the hanging rope 3.

[0083] The working principle is as follows: When the hanging rope 3 is pulled, the free end of the hanging rope 3 drives the rotating body 81 to rotate upward around the rotating axis 811. At this time, the torsion spring 812 is twisted and stores elastic potential energy. The locking bar 82 acts on the side wall of the drawing board 2 as the rotating body 81 rotates, forming a fixed constraint. When the hanging rope 3 is released, the torsion spring 812 releases its elastic potential energy, driving the rotating body 81 to rotate downward. The wedge bar 83 moves with the rotating body 81 and inserts into the gap between the front and back drawing boards. As the width of the wedge bar 83 gradually narrows, its inclined surface generates a lateral force when it contacts the edge of the drawing board 2, pushing the front and back drawing boards 2 to move simultaneously outward from the frame 1. This action can simultaneously release the locking state and trigger the drawing board 2 to pop out with a single lifting operation, achieving rapid disassembly.

[0084] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A self-tightening quick-release double-sided picture frame, comprising a frame body, picture plates are mounted on both the front and back surfaces of the frame body, characterized in that, The upper part of the inner wall of the frame has an installation space, and the installation space is provided with: A locking unit is movably installed within the installation space, enabling the locking unit to act on the side wall of the drawing board; The frame has two through holes at its upper end. The two free ends of the hanging rope pass through the two through holes and are fixedly connected to the locking unit. When the hanging rope is lifted, it drives the locking unit to fix the drawing board in the frame.

2. The self-tightening quick release double-sided picture frame according to claim 1, wherein, The locking unit is rotatably connected within the installation space, and two sets of the locking unit are provided; The locking unit has a first working part and a second working part, which are located on both sides of the rotation center, so that the first working part and the second working part form a lever structure around the rotation center. The two free ends of the hanging rope are respectively fixedly connected to the upper side wall of the first action part of the two sets of locking units. When the hanging rope drives the first action part to move upward, the second action part moves downward and acts on the side wall of the drawing board.

3. The self-tightening quick release double-sided picture frame according to claim 2, wherein, The rotation axis of the locking unit is parallel to the frame, allowing the locking unit to rotate in a plane perpendicular to the frame. The two sets of locking units are symmetrically arranged about the vertical center line of the frame; When the hanging rope moves the first working parts of the two sets of locking units upwards simultaneously, the second working parts of the two sets of locking units act on the upper sidewalls of the front and back drawing boards respectively.

4. The self-tightening quick release double-sided picture frame according to claim 2, wherein, The rotation axis of the locking unit is perpendicular to the frame, allowing the locking unit to rotate within the same plane as the frame. The two sets of locking units are respectively located on both sides of the vertical center line of the frame; Furthermore, the locking unit is positioned at the center of the frame thickness direction. When the hanging rope moves the first action part of the two sets of locking units upward, the second action part can act simultaneously on the upper side wall of both the front and back drawing boards.

5. A self-tightening quick-release double-sided picture frame according to claim 3 or 4, characterized in that, The locking unit is a rotating plate, and a horizontally arranged rotating shaft is fixedly connected to the side wall of the rotating plate. The rotating shaft is parallel to the plate surface, and the other end of the rotating shaft is rotatably connected to the side wall of the installation space. The two ends of the rotating plate are the first working part and the second working part, respectively. The free end of the hanging rope is fixedly connected to one end of the rotating plate, and the other end of the rotating plate is chamfered.

6. A self-tightening quick-release double-sided picture frame according to claim 5, characterized in that, The rotating shaft is positioned close to the first working part, such that the distance from the free end of the hanging rope to the rotating shaft is less than the distance from the other end of the rotating plate to the rotating shaft.

7. A self-tightening quick-release double-sided picture frame according to claim 3 or 4, characterized in that, The locking unit is a cam, a portion of the cam's peripheral sidewall is a first working part, the portion of the cam away from the first working part extends forward to form a second working part, the free end of the hanging rope is fixedly connected to the upper end of the second working part, a horizontally arranged rotating shaft is fixedly connected to the end sidewall of the cam, the rotating shaft is perpendicular to the sidewall of the cam, and the other end of the rotating shaft is rotatably connected to the sidewall of the installation space.

8. A self-tightening quick-release double-sided picture frame according to claim 1, characterized in that, The locking unit is a pressure block, which is vertically slidably installed in the installation space. Fixed pulleys are provided on both sides of the pressure block and are installed on the side wall of the installation space. The free end of the hanging rope passes under the fixed pulley and is fixedly connected to the lower end of the pressure block. When the hanging rope is lifted, the free end of the hanging rope pulls the pressure block downward and acts on the upper side wall of the drawing board.

9. A self-tightening quick-release double-sided picture frame according to claim 1, characterized in that, The locking unit is rotatably connected within the installation space, and two sets of the locking unit are provided; the rotation axis of the locking unit is perpendicular to the frame, allowing the locking unit to rotate within the same plane of the frame; the two sets of the locking unit are respectively located on both sides of the vertical centerline of the frame; The locking unit is a locking element, and the locking element includes: A rotating body, on which a rotating shaft is fixedly connected, the rotating shaft being rotatably connected to the side wall of the installation space, and the free end of the hanging rope being fixedly connected to one end of the rotating body; A locking bar is fixedly connected to one end of the rotating body away from the connection point of the hanging rope, and the locking bar is perpendicular to the rotating body; A wedge-shaped strip is fixedly connected to one end of the rotating body near the hanging rope connection point, and the width of the wedge-shaped strip gradually narrows from the rotating body outwards; A torsion spring is installed between the rotating shaft and the installation space. When the free end of the hanging rope drives the rotating body to rotate upward, the torsion spring deforms and stores elastic potential energy. When the elastic potential energy is released, the wedge strip rotates downward with the rotating body and is inserted between the front and back drawing boards, causing the two drawing boards to move outward from the frame.

10. A self-tightening quick-release double-sided picture frame according to claim 9, characterized in that, The upper end of the wedge-shaped strip is also provided with a clearance surface.

Images