Self-tightening quick-release double-sided picture frame

Abstract

The invention discloses a self-tightening quick-release double-sided picture frame, which belongs to the technical field of picture frames, and comprises a frame body, the front and back surfaces of the frame body are both provided with drawing boards, the upper part of the inner side wall of the frame body is provided with a mounting space, the mounting space is internally provided with a locking unit, the locking unit is movably mounted in the mounting space, and the locking unit is connected with the locking unit; the locking unit can act on the side wall of the drawing board; two through holes are formed in the upper end of the frame body, the two free ends of the hanging rope penetrate through the two through holes respectively and are fixedly connected with the locking unit, and when the hanging rope is lifted, the hanging rope is used for driving the locking unit to fix the drawing board in the frame body. According to the self-tightening quick-release double-sided picture frame, the double-sided picture board is synchronously fixed through the hanging rope linkage locking unit, quick locking and releasing are achieved through the lever principle or elastic potential energy, the problems that a traditional fixing mode is prone to failure and tedious in operation are solved, and the self-tightening quick-release double-sided picture frame has the advantages that double-sided fixing is controlled through single action, the structure is compact, and reliability is high.

Description

Technical Field

[0001] The invention belongs to the technical field of picture frames, and in particular relates to a self-tightening quick-detachable double-sided picture frame. Background Art

[0002] Double-sided picture frames, as a unique display tool, typically consist of a frame body and two panels. Their original design allowed for the display of different paintings or content on both sides of the frame, greatly increasing the diversity and flexibility of displays. They are widely used in various scenarios, such as gallery exhibitions and home decoration.

[0003] Existing double-sided picture frames offer a variety of ways to secure the drawing board to the frame. Common methods include Velcro, which attaches male and female Velcro strips to the edges where the drawing board meets the frame, leveraging the adhesive properties of the Velcro strips to secure the drawing board. Other methods include simple snap-on attachments, which are positioned around the frame and secure by snapping the edges of the drawing board into them. Some frames also utilize methods such as magnetic sheets and positioning magnets, as well as positioning rods that connect to perforations or holes.

[0004] In practice, drawing boards may need to be frequently disassembled, assembled, and replaced. For example, in a gallery setting, the paintings within the frame need to be frequently replaced to adapt to changing exhibition themes or exhibits. In commercial space decoration, the display content often needs to be quickly changed to suit different marketing campaigns or seasonal atmospheres. However, these existing fixing methods have significant shortcomings. For example, after repeated disassembly and assembly, the stickiness of the Velcro gradually weakens, resulting in a loose attachment of the drawing board. During display, the drawing board may wobble or even fall, affecting the display effect and the safety of the painting. Simple snap-on structures often require manual operation of multiple fixing points. During installation, the edges of the drawing board must be accurately inserted into the snaps one by one, and during removal, each snap must be opened one by one, making the entire process tedious and time-consuming. Moreover, existing technologies make it difficult to quickly secure and release both the front and back of the drawing board, resulting in low efficiency when quickly changing paintings.

[0005] To this end, we propose a self-tightening quick-release double-sided picture frame to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the problem that the fixing methods such as Velcro in the prior art cannot meet the demand for frequent disassembly and assembly of double-sided picture frames, and to propose a self-tightening quick-detachable double-sided picture frame.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

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

[0009] a locking unit, the locking unit being movably installed inside the installation space so as to act on the side wall of the drawing board;

[0010] The hanging rope has two through holes on the upper end of the frame, and 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 is used to drive the locking unit to fix the drawing board in the frame.

[0011] Preferably, the locking unit is rotatably connected in the installation space, and two groups of the locking units are provided;

[0012] The locking unit has a first acting portion and a second acting portion, the first acting portion and the second acting portion are respectively located on either side of the rotation center, so that the first acting portion and the second acting portion 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 walls of the first action parts of the two groups 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 groups of locking units are respectively arranged on both sides of the vertical center line of the frame;

[0016] When the hanging rope drives the first action parts of the two groups of locking units to move upward at the same time, the second action parts of the two groups of locking units act on the upper side walls 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 of the frame;

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

[0019] The locking unit is arranged in the center position in the thickness direction of the frame. When the hanging rope drives the first action parts of the two groups of locking units to move upward, the second action parts can act on the upper side walls of the front and back drawing boards at the same time.

[0020] Preferably, the locking unit is a rotating plate, 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 of the rotating plate, the other end of the rotating shaft is rotatably connected to the side wall of the installation space, and the two ends of the rotating plate are respectively the first action part and the second action part;

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

[0022] Preferably, the rotating shaft is arranged close to the first action portion, so that the distance from the free end of the hanging rope to the rotating shaft is smaller 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 side wall is a first action portion, the portion of the cam away from the first action portion extends forward to form a second action portion, the free end of the hanging rope is fixedly connected to the upper end of the second action portion, and a horizontally arranged rotating shaft is fixedly connected to the end side wall of the cam, the rotating shaft is perpendicular to the side wall of the cam, and the other end of the rotating shaft is rotatably connected to the side wall 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 respectively provided on both sides of the pressure block, and the fixed pulleys are installed on the side walls of the installation space. The free end of the hanging rope passes through the bottom of 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 to move downward and act on the upper side wall of the drawing board.

[0025] Preferably, the locking units are rotatably connected in the installation space, and two groups of the locking units are provided; the rotation axes of the locking units are perpendicular to the frame, so that the locking units can rotate in the same plane of the frame; the two groups of the locking units are respectively provided on both sides of the vertical center line of the frame;

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

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

[0028] A locking bar, the locking bar being fixedly connected to one end of the rotating body away from the lanyard connection, the locking bar being perpendicular to the rotating body;

[0029] A wedge-shaped bar, the wedge-shaped bar being fixedly connected to one end of the rotating body near the connection point of the hanging rope, and the width of the wedge-shaped bar gradually narrowing from the rotating body to the outside;

[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 is deformed and stores elastic potential energy. When the elastic potential energy is released, the wedge bar rotates downward with the rotating body and is inserted between the positive and negative drawing boards, so that the positive and negative drawing boards move toward the outside of the frame.

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

[0032] To sum up, the technical effects and advantages of the present invention are as follows: the self-tightening quick-release double-sided picture frame synchronously fixes the double-sided drawing board through a hanging rope linkage locking unit, and uses the lever principle or elastic potential energy to achieve rapid locking and release, which solves the problems of easy failure and cumbersome operation of traditional fixing methods. It has the characteristics of single-action control of double-sided fixation, compact structure and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the overall structure of the present invention;

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

[0035] Figure 3 The structure of the locking unit in the present invention is shown as follows Figure 1 ;

[0036] Figure 4 The structure of the locking unit in the present invention is shown as follows Figure 2 ;

[0037] Figure 5 The structure of the locking unit in the present invention is shown as follows Figure 3 ;

[0038] Figure 6 The structure of the locking unit in the present invention is shown as follows Figure 4 ;

[0039] Figure 7 Schematic diagram of the structure of the locking member in the present invention.

[0040] In the figure: 1, frame; 2, drawing board; 3, hanging rope; 4, rotating plate; 5, cam; 6, pressure block; 7, fixed pulley; 8, locking piece;

[0041] 81. Rotating body; 811. Rotating axis; 812. Torsion spring; 82. Locking bar; 83. Wedge bar; 831. Yield surface. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0043] In existing technology, double-sided picture frames typically consist of a frame and two drawing boards, often secured with Velcro. However, Velcro tends to lose its stickiness over time, resulting in the drawing boards becoming loosely fixed. Replacing drawing boards requires repeated tearing of the Velcro, which is cumbersome and can easily damage the surface. For example, in exhibition settings, where display content frequently changes, traditional structures are not only time-consuming but also difficult to maintain the flatness of the drawing boards.

[0044] To address these issues, a fixing structure that doesn't rely on adhesive materials was needed. Considering that a mechanical linkage can achieve rapid locking and release through motion conversion, an attempt was made to convert the pulling action into mechanical movement of an internal locking unit. It was further discovered that installing a removable locking unit inside the frame and triggering its movement via an external hanging rope would not only conceal the mechanical structure and maintain a simple appearance, but also enhance the fixing stability by utilizing the self-tightening principle.

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

[0046] The installation space is equipped with:

[0047] The locking unit is movably installed inside the installation space so that the locking unit can act on the side wall of the drawing board 2.

[0048] The hanging rope 3 has two through holes on 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. The specific hanging rope 3 can be made of nylon rope or 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 two drawing boards 2 into the frame 1 from the front and back, with the inner side walls of the drawing boards 2 acting on the baffles to ensure that the drawing boards 2 are properly installed. Then, the lower side walls of the drawing boards 2 are brought into contact with the lower inner wall of the frame 1. When the hanging rope 3 is pulled upward to hang on the wall, its free end transmits tension into the installation space through the through hole, causing the locking unit to move or rotate. When the locking unit is acted upon by the driving force, its end contacts the upper side wall of the drawing board 2 and applies pressure, pressing the drawing board 2 into the interior of the frame 1. At this point, a self-tightening state is formed between the locking unit and the drawing board 2. The greater the external force, the stronger the compression force. This external force mainly comes from the weight of the drawing board 2 and the frame 1 itself, so the fixing effect is better for larger frames. When the drawing board 2 needs to be replaced, simply remove the frame from the wall. The hanging rope 3 automatically loosens and resets the locking unit, releasing the constraint on the drawing board 2 for quick removal. The entire process does not require the use of adhesive materials, and the operation is simplified to a single lifting step.

[0050] The beneficial effects are as follows: Compared with the existing technology, traditional Velcro relies on chemical adhesion for fixation and is easily affected by environmental humidity and fails. However, this solution uses a purely mechanical structure to achieve physical locking, and its stability is not affected by material aging. In addition, when replacing the drawing board 2, Velcro needs to be torn off point by point, which is inefficient and may damage the picture. This problem is particularly prominent on large-size picture frames. However, this solution can simultaneously release the constraints of the drawing boards 2 on both sides by pulling the hanging rope 3, thereby improving the replacement efficiency. This structure is particularly suitable for commercial scenarios where the display content needs to be frequently changed. While ensuring the fixed stability of the drawing board 2, the time for a single replacement operation is greatly reduced.

[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 units are rotatably connected in the installation space, and in order to ensure stability, two groups of locking units are provided, and the two groups of symmetrically arranged locking units can synchronously apply balanced pressure.

[0053] The locking unit has a first actuating portion and a second actuating portion. The first actuating portion is the portion of the locking unit that connects to the hanging rope 3 and receives the traction force transmitted by the hanging rope 3. The second actuating portion is the portion of the locking unit that abuts the drawing board 2. The second actuating portion can be implemented as a contact end with a friction surface, which converts rotational motion into a compressive force on the drawing board 2.

[0054] The first acting part and the second acting part are respectively located on both sides of the rotation center. The rotation center refers to the axial position of the rotation movement of the locking unit, which can be specifically determined by the center line of the rotation shaft, so that the first acting part and the second acting part form a lever structure around the rotation center.

[0055] The two free ends of the hanging rope 3 are respectively fixedly connected to the upper side walls of the first action parts of the two groups 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 acting part generates an upward traction force, and at this time the first acting part rotates upward around the center of rotation. Since the first acting part and the second acting part are located on both sides of the rotation center to form a lever structure, the second acting part simultaneously generates a downward rotation displacement. The second acting parts of the two groups of symmetrically arranged locking units act on the upper side walls of the front and back drawing boards 2 respectively, and convert the smaller traction force into a larger downward pressure through the lever principle, thereby achieving balanced compression of the drawing board. When the drawing board 2 needs to be disassembled, the hanging rope 3 is released, and the first acting part returns to its position downward under the action of gravity or an elastic reset member, and the second acting part then separates from the side wall of the drawing board 2 upward, releasing the compression state.

[0057] In this embodiment, the rotation direction of the locking unit can be perpendicular 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 remains perpendicular to the plane of the frame 1 , thereby enabling the locking unit to rotate within a plane perpendicular to the frame 1 .

[0059] The two sets of locking units are arranged symmetrically about the vertical centerline of the frame 1, meaning 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. This can be achieved by using locking units of the same structure and installing them in opposite directions on either side of the frame 1. In other words, the two sets of through holes and the two sets of rotation axes need to be located at the front and rear positions within the frame 1, respectively, so that the lanyard 3 is slightly twisted relative to the frame 1.

[0060] When the hanging rope 3 drives the first action parts of the two sets of locking units to move upward at the same time, the second action parts of the two sets of locking units act on the upper side walls of the front and back drawing boards 2 respectively. In other words, the two sets of locking units correspond to the two drawing boards 2 one by one.

[0061] The above design allows the two drawing boards 2 to be locked or unlocked independently, allowing for individual removal and installation of either drawing board 2 to accommodate a wide range of usage scenarios. To do this, simply loosen one end of the lanyard 3 from the locking unit on the drawing board 2 to be replaced, while maintaining upward traction on the other end. This allows for the replacement of a single drawing board 2.

[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] The two sets of locking units are disposed on either side of the vertical centerline of the frame 1. In other words, the two sets of locking units can be arranged symmetrically about the vertical centerline of the frame 1, with the ends of the hanging rope 3 connected to the ends of the two sets of locking units that are closer to each other or farther away from each other. Alternatively, the two sets of locking units can be arranged in an array across the width of the frame 1, with the ends of the hanging rope 3 connected to the left or right ends of the two sets of locking units.

[0064] The locking units are positioned centrally within the thickness of the frame 1, allowing them to contact both drawing boards 2 simultaneously. When the hanging ropes 3 drive the first action portions of the two locking units upward, the second action portions can simultaneously act on the upper sidewalls of both drawing boards 2, locking or unlocking both drawing boards 2 simultaneously.

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

[0066] Among them, the locking unit is a rotating plate 4, and a horizontally arranged rotating shaft is fixedly connected to the side wall of the rotating plate 4. Specifically, it can be realized by welding a cylindrical metal shaft to the plate body. The rotating shaft is parallel to the plate surface of the rotating plate 4, 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 4 are respectively the first action part and the second action part.

[0067] Furthermore, the rotation axis is positioned near the first actuating portion, so that the distance between the free end of the lanyard 3 and the rotation axis is smaller than the distance between the other end of the rotating plate 4 and the rotation axis. Specifically, the torque difference can be achieved by adjusting the length ratio of the two ends, forming an asymmetric lever structure. When the lanyard 3 pulls the first actuating portion, the second actuating portion 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] Among them, the locking unit is a cam 5, a part of the side wall of the cam 5 is the first action part, the part 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, and a horizontally arranged rotating shaft is fixedly connected to the end side wall of the cam 5, the rotating shaft is perpendicular to the side wall of the cam 5, and the other end of the rotating shaft is rotatably connected to the side wall of the installation space.

[0070] Among them, the cam 5 refers to a rotating component with a specific profile, which can be specifically formed by metal or engineering plastic processing, and the distance from the peripheral side wall of the cam 5 to the rotating axis is set gradually. The installation method in which the rotating axis is perpendicular to the side wall of the cam 5 can be specifically achieved by using bearings or shaft holes to ensure that the cam 5 rotates in the plane in the thickness direction of the frame 1 and accurately transmits the force. The second action part is connected to the hanging rope 3 to form a power input end, which converts the pulling force of the hanging rope 3 into a rotational torque of the cam 5. The first action part forms a continuous pressing surface with the gradual profile of the cam 5, so that the side wall of the cam 5 can act evenly on the side wall of the 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 respectively provided on both sides of the pressure block 6. The fixed pulleys 7 are installed on the side walls of the installation space. The free end of the hanging rope 3 passes through the bottom of 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 to move downward and act on the upper side wall of the drawing board 2.

[0072] The pressure block is a rigid component with a vertical sliding function, specifically made of metal or high-strength plastic, with its lower end surface configured as a flat surface 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, specifically a pulley assembly supported by bearings, used to change the 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 then connects to the lower end of the pressure block 6, so that when the hanging rope 3 is pulled, the pulling force can be converted into downward pressure on the pressure block 6 through the transmission of the pulley 1.

[0073] The working principle is as follows: When the drawing board 2 needs to be secured, the hanging rope 3 is pulled upward. The free end of the hanging rope 3 passes over the fixed pulley 7 and then pulls the pressure block 6 downward, causing the pressure block 6 to slide vertically and press against the upper edge of the drawing board 2. Due to the large contact area between the pressure block 6 and the drawing board 2, pressure can be applied evenly to avoid localized stress concentration. When the drawing board 2 needs to be removed, the hanging rope is simply released, and the pressure of the pressure block 6 on the drawing board is reduced. Alternatively, a reset mechanism can be added to move the pressure block 6 upward and completely separate from the drawing board 2, thereby releasing the pressure on the drawing board 2.

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

[0075] The locking unit is rotatably connected in the installation space, and two groups 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 groups of locking units are respectively arranged on both sides of the vertical center line of the frame 1.

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

[0077] The rotating body 81 is fixedly connected to a rotating shaft 811 , which is rotatably connected to a 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] The locking bar 82 is fixedly connected to one end of the rotating body 81 away from the connection with the hanging rope 3, and the locking bar 82 is perpendicular to the rotating body 81.

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

[0080] Compared with the other schemes mentioned above, a wedge bar 83 is added in this embodiment. When the locking unit is pulled by the hanging rope 3 to rotate upward, the locking bar 82 can lock the drawing board 2. When the traction force of the hanging rope 3 is lost, the wedge bar 83 can rotate in the opposite direction and be inserted between the two drawing boards 2, pushing the drawing board 2 toward the outside of 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 installation space. Specifically, the end of the rotating shaft 811 is sleeved with a rotating sleeve, which is fixedly connected to the side wall of the installation 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, so 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 bar 83 rotates downward with the rotating body 81 and is inserted between the front and back drawing boards 2, causing the front and back drawing boards 2 to move toward the outside of the frame 1.

[0082] Furthermore, a relief surface 831 is provided at the upper end of the wedge bar 83, which is an inclined structure provided at the top of the wedge bar 83 to prevent the wedge bar 83 from interfering with the top of the installation space when the wedge bar 83 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 rotates with the rotating body 81 and acts on the side wall of the drawing board 2 to form a fixed constraint. When the hanging rope 3 is released, the torsion spring 812 releases elastic potential energy, driving the rotating body 81 to rotate downward, and the wedge bar 83 moves with the rotating body 81 and is inserted 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 component of force when it contacts the edge of the drawing board 2, pushing the front and back drawing boards 2 to move toward the outside of the frame 1 at the same time. This action can simultaneously release the locking state and trigger the drawing board 2 to pop out through a single pulling operation, realizing quick disassembly.

[0084] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A self-tightening quick-release double-sided picture frame, comprising a frame body, with drawing boards mounted on both the front and back sides of the frame body, characterized in that: The upper portion of the inner side wall of the frame has an installation space, and the installation space is provided with: a locking unit, the locking unit being movably installed inside the installation space so as to act on the side wall of the drawing board; The hanging rope has two through holes on the upper end of the frame, and 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 is used to drive 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, characterized in that: The locking units are rotatably connected in the installation space, and two groups of locking units are provided; The locking unit has a first acting portion and a second acting portion, the first acting portion and the second acting portion are respectively located on either side of the rotation center, so that the first acting portion and the second acting portion form a lever structure around the rotation center; The two free ends of the hanging rope are respectively fixedly connected to the upper side walls of the first action parts of the two groups 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, characterized in that: 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; The two groups of locking units are symmetrically arranged about the vertical center line of the frame; When the hanging rope drives the first action parts of the two groups of locking units to move upward at the same time, the second action parts of the two groups of locking units act on the upper side walls of the front and back drawing boards respectively.

4. The self-tightening quick-release double-sided picture frame according to claim 2, characterized in that: The rotation axis of the locking unit is perpendicular to the frame, so that the locking unit can rotate within the same plane of the frame; The two groups of locking units are respectively arranged on both sides of the vertical center line of the frame; The locking unit is arranged in the center position in the thickness direction of the frame. When the hanging rope drives the first action parts of the two groups of locking units to move upward, the second action parts can act on the upper side walls of the front and back drawing boards at the same time.

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, 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 of the rotating plate, the other end of the rotating shaft is rotatably connected to the side wall of the installation space, and the two ends of the rotating plate are respectively the first action part and the second action part; The free end of the hanging rope is fixedly connected to one end portion of the rotating plate, and the other end portion of the rotating plate is chamfered.

6. The self-tightening quick-release double-sided picture frame according to claim 5, characterized in that: The rotating shaft is arranged close to the first action part, so that the distance from the free end of the hanging rope to the rotating shaft is smaller 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 side wall is a first acting portion, a portion of the cam away from the first acting portion extends forward to form a second acting portion, the free end of the hanging rope is fixedly connected to the upper end of the second acting portion, and a horizontally arranged rotating shaft is fixedly connected to the end side wall of the cam, the rotating shaft is perpendicular to the side wall of the cam, and the other end of the rotating shaft is rotatably connected to the side wall of the installation space.

8. The 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 respectively provided on both sides of the pressure block, and the fixed pulleys are installed on the side walls of the installation space. The free end of the hanging rope passes through the bottom of 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. The self-tightening quick-release double-sided picture frame according to claim 1, characterized in that: The locking units are rotatably connected in the installation space, and two groups of locking units are provided; the rotation axis of the locking units is perpendicular to the frame, so that the locking units can rotate in the same plane of the frame; the two groups of locking units are respectively provided on both sides of the vertical center line of the frame; The locking unit is a locking member, and the locking member includes: A rotating body, wherein a rotating shaft is fixedly connected to the rotating body, the rotating shaft is rotatably connected to the side wall of the installation space, and the free end of the hanging rope is fixedly connected to one end of the rotating body; A locking bar, the locking bar being fixedly connected to one end of the rotating body away from the lanyard connection, the locking bar being perpendicular to the rotating body; A wedge-shaped bar, the wedge-shaped bar being fixedly connected to one end of the rotating body near the connection point of the hanging rope, and the width of the wedge-shaped bar gradually narrowing from the rotating body to the outside; 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 is deformed and stores elastic potential energy. When the elastic potential energy is released, the wedge bar rotates downward with the rotating body and is inserted between the positive and negative drawing boards, so that the positive and negative drawing boards move toward the outside of the frame.

10. The 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 yield surface.

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