A segmented picture frame and an advertising lightbox with easy-to-change canvas.

Abstract

This utility model belongs to the field of advertising technology and relates to a segmented picture frame and an advertising lightbox with convenient canvas replacement. Each frame of the segmented picture frame includes a picture mounting profile, a movable pressure strip, and a pressure strip opening and closing spring. The movable pressure strip is rotatably connected to the picture mounting profile. The left and right side frames of the canvas frame are divided into several segments, and adjacent segments of the same frame are hinged. The picture mounting profile is provided with a canvas mounting groove, a locking groove, and a picture tensioning pulley group. The movable pressure strip includes a picture pressing part, a locking hook that inserts into the locking groove, and a pin engagement part. The pin engagement part is provided with a drum-shaped shaft hole. The pressure strip opening and closing spring is installed on the inner wall of the picture mounting profile and abuts against the pin engagement part. The picture pressing part presses the edge of the light-transmitting canvas. Its beneficial effect is that the canvas frame can be installed into the lightbox frame in segments, and the light-transmitting canvas is not easy to loosen or shift during disassembly and assembly, solving the technical problems of cumbersome canvas installation and unsatisfactory canvas flatness in existing systems.

Description

Technical Field

[0001] This utility model relates to the field of advertising technology, and in particular to an advertising lightbox with a segmented picture frame and a convenient canvas replacement. Background Technology

[0002] Advertising light boxes, as an effective visual communication tool, are widely used in commercial advertising, outdoor signage, and other fields. For example, large advertising boxes in locations such as bus shelters, newspaper kiosks, and platforms, due to their height and size, make changing the canvas cumbersome and require multiple people to work together to remove and install it. Furthermore, most canvases on the market are simply fixed inside the light box with cable ties and clips, which can easily lead to unevenness, affecting the advertising effect and causing unnecessary rework, wasting time and effort.

[0003] Therefore, it is necessary to develop an advertising lightbox that allows for easy canvas replacement while delivering better advertising results. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, this utility model provides an advertising lightbox with a segmented frame and convenient canvas replacement, which solves the technical problems of troublesome canvas installation and unsatisfactory canvas flatness in existing advertising lightboxes.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0008] In a first aspect, this utility model embodiment provides a segmented picture frame, including a canvas frame body. Each side of the canvas frame body includes a picture mounting profile, a movable pressure strip, and a pressure strip opening and closing spring. The movable pressure strip is rotatably connected to the picture mounting profile. The pressure strip opening and closing spring is installed on the inner wall of the picture mounting profile and abuts against the movable pressure strip. The left and right side frames of the canvas frame body are divided into several segments, and adjacent segments of the same frame are hinged together.

[0009] The mounting profile is equipped with a canvas mounting groove, a locking groove, and a canvas tensioning pulley assembly for mounting the translucent canvas. The movable pressure strip includes, from the inside out, a canvas pressing part, a locking hook that matches the locking groove, and a pin engagement part. The pin engagement part is provided with a drum-shaped shaft hole. A pin shaft is fixed in the mounting profile. The pin shaft passes through the shaft hole. When the locking hook and locking groove are locked, the canvas pressing part covers the canvas mounting groove and presses the edge of the translucent canvas.

[0010] Optionally, the pin mating part is drum-shaped, including a set of parallel planes and an arc-shaped tail.

[0011] Optionally, two canvas mounting slots are provided side by side, extending along the length of the canvas mounting profile.

[0012] Optionally, an installation step is provided on the inner side of the rear end of the segmental image mounting profile, and an anti-tilt pulley is installed on the installation step.

[0013] Optionally, the locking groove extends along the length of the mounting profile, and a pressure strip hinge is installed in the locking groove, with a pin shaft installed on the pressure strip hinge.

[0014] Secondly, this utility model embodiment provides an advertising lightbox with convenient canvas replacement, including a lightbox frame, a backlight source installed on the back of the lightbox frame, and the aforementioned segmented frame.

[0015] Each frame of the lightbox frame includes a canvas cover and a frame body profile. The canvas cover rotates and fits onto the front of the frame body profile. The frame body profiles on the left and right sides are provided with frame mounting grooves. The frame mounting grooves extend along the length of the frame body profiles. An inlet is provided on the front of the lower end of the frame body profiles. The frame mounting grooves and the inlet are interconnected. The canvas frame's screen tensioning pulley group slides from the inlet into the frame mounting groove, so that the canvas frame is movably installed inside the lightbox frame.

[0016] Optionally, the front and rear sides of the frame mounting groove are bent towards each other to form two arc-shaped sliding surfaces, which are adapted to the pulleys of the picture tensioning pulley group.

[0017] Optionally, an anti-tilt platform is vertically provided on the outer wall of the rear side of the frame mounting slot, and the anti-tilt pulley of the canvas frame cooperates with the anti-tilt platform.

[0018] Optionally, an anti-reflective panel is installed on the inside of the main frame profile.

[0019] Optionally, a cover opening and closing spring is provided between the canvas cover and the frame main body profile, with one end of the cover opening and closing spring connected to the inner wall of the canvas cover and the other end connected to the frame main body profile.

[0020] The canvas cover has an arc-shaped structure on the outside, and the main frame profile has a matching receiving groove and a spherical protrusion. The inner surface of the arc-shaped structure fits into the spherical protrusion.

[0021] (III) Beneficial Effects

[0022] The beneficial effects of this utility model are:

[0023] 1. This utility model relates to a segmented picture frame and an advertising lightbox with convenient canvas replacement. The left and right side borders of the canvas frame are divided into several segments, with adjacent segments hinged together to form a segmented canvas frame. The canvas frame is equipped with a pressure strip opening and closing spring, a movable pressure strip, and a picture mounting profile. The picture mounting profile has a locking groove and a canvas mounting groove. The movable pressure strip has a locking hook and a pin engagement part with a drum-shaped shaft hole. The pressure strip opening and closing spring presses against the pin engagement part, causing the locking hook to tightly engage with the... The locking grooves engage and lock together, thereby pressing the movable pressure strip firmly against the translucent canvas. The canvas frame's tensioning pulley group slides into the frame mounting groove, allowing the canvas frame to be movably installed within the lightbox frame. Compared to existing technologies, the canvas frame, as a whole, can be installed into and removed from the lightbox frame in sections. Furthermore, the translucent canvas is less prone to loosening or shifting during assembly and disassembly, and the canvas has a high degree of flatness. This solves the technical problems of cumbersome canvas installation and unsatisfactory canvas flatness in existing technologies.

[0024] 2. Due to the organic cooperation between the pressure strip opening and closing spring, the drum-shaped shaft hole, the near-drum-shaped pin fitting part, the locking hook and the locking groove, after opening the canvas cover, pushing the movable pressure strip outward will disengage the locking hook from the locking groove, thereby opening the movable pressure strip. Furthermore, the movable pressure strip can automatically remain open under the pushing force of the pressure strip opening and closing spring, making it convenient for staff to change the canvas. After changing the canvas, rotating the movable pressure strip in the opposite direction and inserting the locking hook into the locking groove will cause the movable pressure strip to automatically remain closed under the pushing force of the pressure strip opening and closing spring, pressing the light-transmitting canvas, thus improving the user experience of the advertising light box.

[0025] 3. The installation of a tensioning pulley system allows the canvas frame to slide more smoothly into the lightbox frame. The anti-tilt pulley system effectively prevents the canvas frame from tilting during the sliding process, avoiding damage due to uneven force. The canvas frame slides more smoothly and evenly into the lightbox frame, resulting in a better overall display effect.

[0026] 4. An entry point is provided on the front of the lower end of the main frame profile. The frame mounting groove and the entry point are interconnected. Therefore, the canvas frame can be inserted into the light box frame at the bottom of the advertising light box without the need for high-altitude disassembly and assembly auxiliary tools. It can be operated by a single person, saving labor and making the operation simpler.

[0027] 5. A segmented frame is adopted. The inner sides of both the left and right edges of the lightbox frame are equipped with frame mounting slots, and the lower front of the main frame profile has an entry point that connects to the mounting slots. When replacing the translucent canvas, the entire canvas frame is replaced directly. The canvas frame is pulled out of the mounting slot through the entry point by the pulley system, and the canvas frame is disassembled in segments. Then, the canvas frame with the new translucent canvas is slid into the lightbox frame segment by segment through the entry point. Compared to existing technologies, this allows for quick replacement of the advertising lightbox canvas, reducing the time required for disassembly and replacement. The canvas replacement operation is simpler and faster, making it more suitable for installation environments with high traffic and dense crowds, such as airports and high-speed rail stations. This solves the technical problem of cumbersome and time-consuming canvas replacement operations in existing advertising lightboxes. Attached Figure Description

[0028] Figure 1 This is a partially exploded view of the canvas frame of Embodiment 1 of the present invention, which is a segmented picture frame and an advertising lightbox with easy canvas replacement (the light-transmitting canvas is not shown).

[0029] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0030] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0031] Figure 4 for Figure 1 A cross-sectional view of the canvas frame along the CC direction;

[0032] Figure 5 This is one of the schematic diagrams showing the unlocked state of the movable pressure strip of the canvas frame in Embodiment 1 of the present invention, which is a segmented picture frame and an advertising lightbox with easy canvas replacement.

[0033] Figure 6 This is a second schematic diagram of the unlocked state of the movable pressure strip of the canvas frame, which is an embodiment of the present invention of a segmented picture frame and an advertising light box with easy canvas replacement.

[0034] Figure 7 This is a schematic diagram of the assembly state of the lightbox frame and the canvas frame of Embodiment 2 of the present invention, which is a segmented picture frame and an advertising lightbox with convenient canvas replacement.

[0035] Figure 8 This is a three-dimensional schematic diagram of an advertising lightbox (not showing the translucent canvas) as an embodiment 2 of the present invention, which is a segmented picture frame and an advertising lightbox with easy canvas replacement.

[0036] Figure 9This is an exploded view of an advertising lightbox (not showing the translucent canvas) as an embodiment 2 of the present invention, which is a segmented picture frame and an advertising lightbox with easy canvas replacement.

[0037] Figure 10 This is an exploded view of the advertising lightbox frame (the translucent canvas is not shown) of Embodiment 2 of the present invention, which is a segmented picture frame and an advertising lightbox with easy canvas replacement.

[0038] [Explanation of Labels in the Attached Image]

[0039] 1. Lightbox frame; 11. Canvas cover; 111. Arc structure; 12. Main frame profile; 121. Receiving groove; 122. Frame mounting groove; 1222. Entry port; 123. Anti-tilt platform; 13. Anti-reflective plate; 14. Cover opening and closing spring;

[0040] 2. Canvas frame; 20. Segment; 21. Picture mounting profile; 211. Canvas mounting groove; 212. Locking groove; 213. Spring mounting position; 214. Mounting step; 22. Movable pressure strip; 221. Picture clamping part; 222. Locking hook; 223. Pin mating part; 23. Pressure strip opening and closing spring; 24. Pressure strip hinge; 25. Picture tensioning pulley group; 26. Anti-tilt pulley;

[0041] 3. Backlight source;

[0042] 4. Translucent canvas; 41. Anti-slip silicone strip. Detailed Implementation

[0043] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. In this document, directional terms such as "upper" and "lower" are used interchangeably with... Figure 9 Using the orientation as a reference, the direction of the canvas frame 2 is "front", the direction of the backlight source 3 is "back", the direction closer to the center of the translucent canvas 4 is "inside", and the direction farther from the center of the translucent canvas 4 is "outside".

[0044] This utility model provides a segmented picture frame and an advertising lightbox with convenient canvas replacement. The segmented picture frame includes a canvas frame body. Each side of the canvas frame body includes a picture mounting profile, a movable pressure strip, and a pressure strip opening / closing spring. The movable pressure strip is rotatably connected to the picture mounting profile. The pressure strip opening / closing spring is installed on the inner wall of the picture mounting profile and abuts against the movable pressure strip. The left and right side frames of the canvas frame body are divided into several segments, and adjacent segments of the same frame are hinged together. The picture mounting profile is provided with a canvas mounting groove, a locking groove, and a picture tensioning slide for mounting a translucent canvas. The roller assembly, from the inside out, includes a picture pressing part, a locking hook that matches the locking groove, and a pin engagement part. The pin engagement part is provided with a drum-shaped shaft hole. A pin shaft is fixed in the picture mounting profile. The pin shaft passes through the shaft hole. When the locking hook and locking groove are locked, the picture pressing part covers the canvas mounting groove and presses the edge of the light-transmitting canvas. Compared with the existing technology, the canvas frame is a whole and can be installed in sections into the lightbox frame. The light-transmitting canvas is not easy to loosen or shift during disassembly and assembly. The canvas has high flatness, which solves the technical problems of cumbersome canvas installation and unsatisfactory canvas flatness in the existing technology.

[0045] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0046] Example 1:

[0047] See Figures 1 to 3 The left and right sides of the canvas frame 2 are each divided into several segments 20, and the number of segments 20 on both sides is the same. Adjacent segments 20 on the same side are hinged together. In practical applications, the number of segments 20 on the left and right sides is set according to the actual length of the canvas frame 2. When the length of the canvas frame 2 changes, the number of segments 20 can be increased or decreased appropriately, making it highly practical. The canvas frame 2 is segmented by the lines connecting the hinge points of the opposite segments 20 on the left and right sides. Adjacent segments can be bent during installation and disassembly. This segmented canvas frame 2 makes it easy to insert or slide the left and right sides of the canvas frame 2 into the lightbox frame 1 from the inlet 1222, realizing the segmented installation and disassembly of the canvas frame 2. Each segment 20 is provided with a picture tensioning pulley group 25 on the outside. The picture tensioning pulley group 25 enters the frame mounting groove 122 from the inlet 1222 so that the canvas frame 2 is installed in the frame main profile 12 of the light box frame 1. Then the canvas cover 11 is closed so that the canvas frame 2 is built into the light box frame 1.

[0048] In this application, the left and right sides of the canvas frame 2 are divided into four segments 20. The top and bottom ends of the first segment 20 are equipped with screen tensioning pulleys 25. The second and third segments 20 are equipped with screen tensioning pulleys 25 at the top. The bottom segment 20 is equipped with screen tensioning pulleys 25 at the bottom.

[0049] See Figures 2 to 5 As a feasible solution, each frame of the canvas frame 2 includes a picture mounting profile 21, a movable pressure strip 22, a pressure strip hinge 24, and a pressure strip opening and closing spring 23. The inner side of the front end of the picture mounting profile 21 is provided with a canvas mounting groove 211, and each side of the light-transmitting canvas 4 is inserted into the corresponding canvas mounting groove 211.

[0050] See Figures 2 to 5 The image mounting profile 21 has a locking groove 212 along its length. A pressure strip hinge 24 is installed in the locking groove 212, and a pin is installed on the pressure strip hinge 24. The pressure strip hinge 24 is a hinge component used to connect the movable pressure strip 22 and the image mounting profile 21. The movable pressure strip 22 and the pressure strip hinge 24 of the image mounting profile 21 are rotatably connected together by a pin, and the end of the movable pressure strip 22 presses against the edge of the front of the translucent canvas 4. The pressure strip opening and closing spring 23 is installed on the spring mounting position 213 of the image mounting profile 21 and abuts against the movable pressure strip 22, providing an inward pushing force to the movable pressure strip 22.

[0051] See Figure 3 and Figure 5 The movable retaining strip 22 includes a picture pressing part 221, a locking hook 222, and a pin engaging part 223. The picture pressing part 221 is used to press the edge of the translucent canvas 4. The locking hook 222 is located between the picture pressing part 221 and the pin engaging part 223 and can be engaged and locked together with the locking groove 212 of the picture mounting profile 21. The pin engaging part 223 is used to engage with the pin shaft. It is approximately drum-shaped, including a set of parallel planes and an arc-shaped tail. The pin engaging part 223 is provided with a drum-shaped shaft hole, in which the pin shaft is placed.

[0052] See Figure 4 When the movable pressure strip 22 is in a closed state, the arc-shaped tail of the pin engagement part 223 abuts against the pressure strip opening and closing spring piece 23, and the pressure strip opening and closing spring piece 23 applies an inward pushing force to the pin engagement part 223. The locking hook 222 is inserted into the locking groove 212 and remains stationary, and the picture pressing part 221 presses the edge of the light-transmitting canvas 4.

[0053] See Figure 5 and Figure 6When the movable pressure strip 22 is pushed outward, the pressure strip opening and closing spring 23 is compressed, and the movable pressure strip 22 moves outward relative to the pin axis, causing the locking hook 222 to disengage from the locking groove 212. At this time, if the movable pressure strip 22 is pushed outward, the tail of the pin engagement part 223 continues to press the pressure strip opening and closing spring 23 until the critical point. The movable pressure strip 22 automatically rotates to be perpendicular to the translucent canvas 4. At this time, the pressure strip opening and closing spring 23 is pressing the front plane of the pin engagement part 223. Under the pushing force of the pressure strip opening and closing spring 23, the movable pressure strip 22 remains open, making it convenient for the operator to open the translucent canvas 4. The anti-slip silicone strip 41 at the edge of the translucent canvas 4 is inserted into the canvas mounting groove 211. After the edge of the translucent canvas 4 is installed, the movable pressure strip 22 is rotated until the locking hook 222 is inserted into the locking groove 212. At this time, the arc-shaped tail of the pin engagement part 223 abuts against the pressure strip opening and closing spring 23. The pressure strip opening and closing spring 23 applies an inward pushing force to the pin engagement part 223, and the locking hook 222 remains stationary in the locking groove 212. The picture pressing part 221 presses the edge of the translucent canvas 4, and the movable pressure strip 22 is closed again, completing the installation of the translucent canvas 4 on the canvas frame 2. When it is necessary to remove the translucent canvas 4, push the movable pressure strip 22 outward until the movable pressure strip 22 automatically rotates to be perpendicular to the translucent canvas 4, and then the translucent canvas 4 can be removed.

[0054] Due to the organic cooperation between the pressure strip opening and closing spring 23, the locking hook 222, the locking groove 212, the drum-shaped shaft hole and the approximately drum-shaped pin mating part 223, the movable pressure strip 22 can automatically maintain a closed and locked state to press the light-transmitting canvas 4, or it can be fixed in the open state to facilitate the operator to complete the replacement and maintenance of the light-transmitting canvas 4, resulting in a better user experience.

[0055] Under the action of the pressure strip opening and closing spring 23, the locking hook 222 of the movable pressure strip 22 is tightly engaged in the locking groove 212, so that the screen pressing part 221 keeps pressing the light-transmitting canvas 4. During the process of installing the canvas frame 2 into the light box frame 1 in sections and removing it from the light box frame 1 in sections, the light-transmitting canvas 4 will not loosen or shift, and there will be no problem of uneven display.

[0056] See Figure 5 In some feasible solutions, two canvas mounting slots 211 are arranged side by side, extending along the length of the canvas mounting profile 21. The operator can adjust and change the snap-in position of the anti-slip silicone strip 41 according to actual needs, adapting to different sizes of translucent canvas 4, thus enhancing practicality.

[0057] See Figure 3 , Figure 4 and Figure 7Segment 20 is also equipped with anti-tilt pulleys 26. Specifically, the middle and rear ends of the screen mounting profile 21 of segment 20 are perpendicular to each other, forming an L-shaped structure. A screen tensioning pulley assembly 25 is bolted to the outer side of the middle position. The screen tensioning pulley assembly 25 has two rows of pulleys, with the pulleys in each row spaced apart, and the number of pulleys is unlimited. The front and rear ends of the frame mounting groove 122 are bent towards each other, forming two arc-shaped sliding surfaces. The screen tensioning pulley assembly 25 is placed in the frame mounting groove 122, and the arc-shaped sliding surfaces are adapted to the pulleys of the screen tensioning pulley assembly 25. An anti-tilt platform 123 is vertically provided on the outer wall of the rear side of the frame mounting groove 122. An installation step 214 is provided at the rear end of the screen mounting profile 21. The installation step 214 is bolted to the anti-tilt pulley 26, which is located on the inner side behind the screen tensioning pulley assembly 25. The number of anti-tilt pulleys 26 on each segment 20 is unlimited and can be set according to actual needs. The anti-tilt pulleys 26 cooperate with the anti-tilt platform 123. During the process of inserting the canvas frame 2 into the lightbox frame 1, the anti-tilt pulleys 26 slide on the anti-tilt platform 123. In other words, the pulleys of the picture tensioning pulley group 25 slide on the arc-shaped sliding surface, while the anti-tilt pulleys 26 slide on the anti-tilt platform 123. The contact positions between the two and the picture mounting profile 21 are different, so that the anti-tilt pulleys 26 can achieve the effect of preventing the canvas frame 2 from tilting, ensuring that the canvas frame 2 slides smoothly and quickly into the frame mounting groove 122, and improving the service life of the canvas frame 2.

[0058] Example 2:

[0059] Reference Figures 7 to 9 Based on Embodiment 1, Embodiment 2 provides an advertising lightbox with a convenient canvas replacement feature, including a lightbox frame 1, a backlight source 3 installed on the rear side of the lightbox frame 1, and the aforementioned canvas frame 2. The canvas frame 2 is movably installed in the lightbox frame 1 for mounting a translucent canvas 4, and the backlight source 3 provides light to the translucent canvas 4. The backlight source 3 is typically a backlight panel or light strip.

[0060] See Figure 7 and Figure 10The lightbox frame 1 is generally rectangular, with four side panels connected sequentially. Each side panel includes a canvas cover 11 and a frame main body profile 12. The canvas cover 11 rotates to close onto the front of the frame main body profile 12. The frame main body profiles 12 on the left and right sides have frame mounting grooves 122 that extend along the length of the frame main body profile 12, typically passing through both the top and bottom ends. An inlet 1222 is provided on the front of the lower end of the frame main body profile 12, and the frame mounting groove 122 and the inlet 1222 are interconnected. A slot is provided on the inner side of the frame main body profile 12, into which an anti-reflective plate 13 is inserted and fixed to prevent reflections on the inside of the lightbox frame 1. The frame mounting groove 122 is used to cooperate with the image tensioning pulley group 25, allowing the image tensioning pulley group 25 to slide within it.

[0061] See Figure 7 A cover opening and closing spring 14 is provided between the canvas cover 11 and the frame main body profile 12. One end of the cover opening and closing spring 14 is connected to the inner wall of the canvas cover 11, and the other end is connected to the frame main body profile 12, ensuring that the canvas cover 11 is in a closed state during normal use of the advertising lightbox. In actual production applications, the outer side of the canvas cover 11 is provided with an arc-shaped structure 111, and the frame main body profile 12 is provided with a matching receiving groove 121 and a spherical protrusion. The inner surface of the arc-shaped structure 111 fits against the spherical protrusion. When the canvas cover 11 rotates, the arc-shaped structure 111 slides into the receiving groove 121 around the spherical protrusion.

[0062] Because the left and right sides of the canvas frame 2 are divided into multiple segments 20, and adjacent segments 20 are hinged together, a segmented canvas frame 2 is formed. Each segment 20 rotates back and forth around the hinge point. Each segment 20 is equipped with a picture tensioning pulley group 25. The left and right sides of the lightbox frame 1 are provided with frame mounting grooves 122, and the lower end of the frame mounting grooves 122 has an inlet 1222 on the front. When it is necessary to replace the light-transmitting canvas 4, the canvas frame 2 can be removed in segments. Specifically, first, open the canvas cover 11, then pull the screen tension pulleys 25 of each section 20 out of the frame mounting slot 122 through the inlet 1222 in sequence, then replace the light-transmitting canvas 4 on the canvas frame 2, then slide the screen tension pulleys 25 of the canvas frame 2 with the new light-transmitting canvas 4 into the frame mounting slot 122 through the inlet 1222, and then close the canvas cover 11. Compared with the existing technology, it can quickly replace the canvas of the advertising light box, reduce the time for disassembling and replacing the light-transmitting canvas 4, and make the operation of replacing the light-transmitting canvas 4 simpler and faster. It is more suitable for installation and use environments with high traffic and dense crowds, such as airports and high-speed rail stations, and solves the technical problem of the cumbersome and time-consuming operation of replacing the canvas of existing advertising light boxes.

[0063] It should be noted that when removing the canvas frame 2, the first segment 20 located at the top of the left and right sides of the canvas frame 2 is generally left in the lightbox frame 1. In other words, during the replacement of the translucent canvas 4, the picture tensioning pulley group 25 of the first segment 20 of the canvas frame 2 remains in the frame mounting slot 122, so it is not necessary to remove the entire canvas frame 2 before replacing the translucent canvas 4, which saves more time.

[0064] When installing the canvas frame 2 into the lightbox frame 1, first push the first segment 20 remaining in the lightbox frame 1 upwards. This moves the image tension pulley group 25 of the second segment 20 closer to the inlet 1222 and into the frame mounting slot 122. Then, push the second segment 20 upwards a short distance until the image tension pulley group 25 of the third segment 20 is brought closer to the inlet 1222 and inserted into the frame mounting slot 122. Repeat this process until the canvas frame 2 is completely installed in the lightbox frame 1. When removing the canvas frame 2, once only the topmost first segment 20 remains in the lightbox frame 1, the operator can stand on the ground and begin replacing the translucent canvas 4. It should be noted that when the canvas cover 11 is open, the operator can see the canvas mounting slot 211 of the canvas frame 2 and the edge of the translucent canvas 4. Therefore, even if the uppermost segment 20 remains on the lightbox frame 1, it will not hinder the replacement operation of the translucent canvas 4.

[0065] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0067] In this utility model, unless otherwise explicitly specified and limited, the term "above" or "below" the second feature can refer to the first and second features being in direct contact or indirect contact via an intermediate medium. Furthermore, the terms "above," "on top of," and "over" the second feature can mean the first feature is directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature. Similarly, the terms "below," "below," and "under" the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicate that the first feature is at a lower horizontal level than the second feature.

[0068] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A segmented picture frame, characterized in that: The canvas frame (2) includes a canvas frame body (2), each of the edges of the canvas frame body (2) includes a picture mounting profile (21), a movable pressure strip (22) and a pressure strip opening and closing spring (23). The movable pressure strip (22) is rotatably connected to the picture mounting profile (21). The pressure strip opening and closing spring (23) is installed on the inner wall of the picture mounting profile (21) and abuts against the movable pressure strip (22). The left and right edges of the canvas frame body (2) are divided into several segments (20), and adjacent segments (20) of the same edge are hinged together. The image mounting profile (21) is provided with a canvas mounting groove (211), a locking groove (212), and an image tensioning pulley group (25) for mounting the translucent canvas (4). The movable pressure strip (22) includes, from the inside to the outside, an image pressing part (221), a locking hook (222) adapted to the locking groove (212), and a pin engagement part (223). The pin engagement part (223) is provided with a drum-shaped shaft hole. A pin shaft is fixed in the image mounting profile (21). The pin shaft passes through the shaft hole. When the locking hook (222) is locked with the locking groove (212), the image pressing part (221) covers the canvas mounting groove (211) and presses the edge of the translucent canvas (4).

2. A segmented picture frame as described in claim 1, characterized in that: The pin fitting part (223) is drum-shaped in general, including a set of parallel planes and an arc-shaped tail.

3. A segmented picture frame as described in claim 1, characterized in that: Two canvas mounting slots (211) are arranged side by side, extending along the length of the canvas mounting profile (21).

4. A segmented picture frame as described in claim 1, characterized in that: An installation step (214) is provided on the inner side of the rear end of the screen mounting profile (21) of the segment (20), and an anti-tilt pulley (26) is installed on the installation step (214) by bolts.

5. A segmented picture frame as described in claim 1, characterized in that: The locking groove (212) extends along the length of the screen mounting profile (21), and a pressure strip hinge (24) is installed in the locking groove (212), and the pin shaft is installed on the pressure strip hinge (24).

6. An advertising lightbox with a convenient canvas replacement feature, characterized in that: It includes a lightbox frame (1), a backlight source (3) installed on the rear side of the lightbox frame (1), and a segmented picture frame as described in any one of claims 1 to 5; Each side of the lightbox frame (1) includes a canvas cover (11) and a frame body profile (12). The canvas cover (11) rotates to cover the front of the frame body profile (12), and the frame body profiles (12) on the left and right sides are provided with frame mounting grooves (122). The frame mounting grooves (122) extend along the length of the frame body profile (12). An inlet (1222) is provided on the front of the lower end of the frame body profile (12). The frame mounting grooves (122) and the inlet (1222) are connected to each other. The picture tensioning pulley group (25) of the canvas frame (2) slides from the inlet (1222) into the frame mounting groove (122) so that the canvas frame (2) is movably installed in the lightbox frame (1).

7. The advertising lightbox with a convenient canvas replacement as described in claim 6, characterized in that: The front and rear sides of the frame mounting groove (122) are bent towards each other to form two arc-shaped sliding surfaces, which are adapted to the pulleys of the screen tensioning pulley group (25).

8. The advertising lightbox with a convenient canvas replacement as described in claim 6, characterized in that: An anti-tilt platform (123) is vertically provided on the outer wall of the rear side of the frame mounting groove (122), and the anti-tilt pulley (26) of the canvas frame (2) cooperates with the anti-tilt platform (123).

9. The advertising lightbox with a convenient canvas replacement as described in claim 6, characterized in that: An anti-reflective plate (13) is installed on the inner side of the main frame profile (12).

10. The advertising lightbox with a convenient canvas replacement as described in claim 6, characterized in that: A cover opening and closing spring (14) is provided between the canvas cover (11) and the frame main body profile (12). One end of the cover opening and closing spring (14) is connected to the inner wall of the canvas cover (11), and the other end is connected to the frame main body profile (12). The canvas cover (11) has an arc-shaped structure (111) on its outer side, and the frame main body profile (12) has a matching receiving groove (121) and a spherical protrusion. The inner surface of the arc-shaped structure (111) fits against the spherical protrusion.

Images