Angle-adjustable portable outdoor sketching stand

Abstract

The present application relates to a portable outdoor sketching support with adjustable angle, which belongs to the technical field of outdoor sketching support. The portable outdoor sketching support with adjustable angle is provided with a hollow multifunctional box plate. A telescopic frame is horizontally slidably arranged inside the multifunctional box plate. A drawing board is hingedly connected to the outside of the telescopic frame through elastic damping. A first supporting rod is rotatably installed at the bottom of the box plate and is cross-hingedly connected with an axially elastically telescopic second supporting rod. A slider at the top end of the second supporting rod is fixed to the bottom inside of the telescopic frame. When unfolded, the two supporting rods are linked to rotate, driving the slider to slide outwards, and the second supporting rod is self-adaptively elongated, so that the drawing board is moved out of the box and turned over. A rotating column is arranged at the bottom of the drawing board and is rotatably arranged in the telescopic frame. A locking bolt is arranged to lock and position the drawing board after the drawing board is adjusted to the target inclination angle. The portable outdoor sketching support with adjustable angle has simple and compact overall structure, is easy to store and carry, and is flexible in angle adjustment, which can well meet the use requirements of outdoor sketching.

Description

Technical Field

[0001] This invention relates to the field of outdoor sketching stand technology, specifically to a portable outdoor sketching stand with adjustable angle. Background Technology

[0002] Outdoor sketching is an important form of art creation and painting training. Creators usually need to bring various equipment such as drawing boards, easels, sketching stools, and painting tools to outdoor sites to carry out their creations. Currently, the mainstream outdoor sketching support equipment on the market is mainly divided into two categories: freestanding sketching easels and integrated sketching stands. However, existing products have two main shortcomings in actual outdoor use.

[0003] First, the overall functionality is fragmented, resulting in extremely poor portability. Currently, most sketching stands only have the single function of mounting a drawing board. When sketching, users need to carry an outdoor sketching stool and tool storage bag separately. The entire set of painting equipment is numerous, bulky, and weighted, making it extremely burdensome to carry for long hikes or outdoor sketching trips. At the same time, traditional sketching stands generally use traditional storage structures such as tripods, which still have protruding support rods after being stored. The overall storage volume is relatively large, and it is impossible to achieve fully enclosed integrated storage, making it very inconvenient to carry.

[0004] Furthermore, traditional sketching tripods, designed for portability, are generally too lightweight, resulting in insufficient wind resistance and stability outdoors. Conventional outdoor sketching tripods, prioritizing portability, are constructed entirely of lightweight tubing, resulting in extremely low weight. In windy conditions, the easel is easily tipped over by lateral winds, damaging the canvas, paper, and artwork, and disrupting the sketching rhythm. Some tripods improve stability by adding weights to the base, but this significantly increases the overall weight of the equipment, sacrificing portability and failing to balance lightweight design with supportive stability.

[0005] In summary, existing outdoor sketching stands cannot simultaneously meet the multiple usage requirements of integrated design, high stability, multi-angle adjustment, convenient storage, safe storage, and adaptability to complex outdoor environments. Therefore, developing a better portable outdoor sketching stand has great practical application value. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an adjustable-angle portable outdoor sketching stand to solve the problems of current outdoor sketching stands on the market, which are difficult to integrate multiple functions, have insufficient installation stability and poor portability.

[0007] This invention is achieved through the following technical solution: An adjustable-angle portable outdoor sketching stand includes a hollow multi-functional box panel. A telescopic frame is horizontally slidably mounted on the upper part of the box panel, and a drawing board is elastically damped and hinged to the outer side of the telescopic frame. The top end of a first support rod is rotatably mounted on the bottom side of the multi-functional box panel, opposite to the sliding direction of the telescopic frame. The first and second support rods are cross-hinged, and the second support rod is an axially elastically telescopic member. A slider is hinged to its top telescopic end, and this slider is fixed to the bottom surface of the side where the telescopic frame is always located inside the multi-functional box panel. When the stand is unfolded, the first support rod rotates around a fixed point, and the second support rod... One of the support rods rotates hinged around the hinge point with the first support rod while sliding the slider towards the outside of the multi-functional box panel. The second support rod adaptively and elastically extends until it reaches its limit. At this point, the entire slide plate is exposed outside the multi-functional box panel and flips upward to a set tilt angle based on elastic damping hinge. Two rotating columns are fixed opposite each other on the bottom side of the slide plate. The rotating columns are rotatably installed in the telescopic frame, and at least one rotating column has a locking bolt installed on the telescopic frame at its end. When the slide plate is rotated to the required tilt angle, the locking bolt is tightened to axially press and fix the rotating column.

[0008] Furthermore, the telescopic frame includes a strip-shaped outer slide plate and an inner slide plate. The outer slide plate is used to hinge and install the slide plate, and the inner slide plate is used to fix and connect to the slider. A support rod is fixed at the end of each of the two slide plates, and a tension spring is set parallel to the support rod and used to elastically connect the two slide plates. When the support rod is horizontally located between the two slide plates, the tension spring is in a stretched state. One end of the support rod is hinged to the side of the outer slide plate used to connect the tension spring, and the other end is turned downwards out of the telescopic frame to make contact with the ground support to assist in supporting the telescopic frame and the drawing board.

[0009] Two guide rods are also provided in the center between the two slide plates, parallel to the support rod. One end of the guide rod is fixed to the outer slide plate, and the other end slides through the inner slide plate and is located inside the multi-functional box plate. The guide rod between the two slide plates is fitted with the tension spring so that when the slide plate is fully exposed from the multi-functional box plate, the support rod can be rotated downwards, and the two slide plates will move closer to each other, thus shortening the distance between the slide plate and the multi-functional box plate.

[0010] Furthermore, the outer slide plate has an upwardly protruding structure at its edge, and a [-shaped mounting groove is formed on the inner side of the protrusion, with the bottom of the mounting groove curved into an arc shape; the bottom of the slide plate has a columnar protrusion, which is located in the mounting groove, and the two ends of the protrusion are fixed with the rotating column, and at least one rotating column has a shallow groove in its end face. When the locking bolt is fastened to the side of the protrusion, the smooth column section at the end of the locking bolt is coaxially inserted into the shallow groove and axially presses the rotating column.

[0011] Furthermore, the bottom end of the second support rod is provided with a V-shaped auxiliary foot. The auxiliary foot is made of two connecting plates hinged in a V-shape by a torsion spring. A limiting block with a U-shaped groove is also fixed at the bottom end of the second support rod. The hinge axis of the two connecting plates is located inside the limiting block. A rectangular sliding sleeve is also included. The sliding sleeve is fitted on the outside of the two connecting plates to hold the two connecting plates together and stack them. When the sliding sleeve is removed, the two connecting plates automatically spring open and abut against the two opposite slots of the U-shaped groove, so that the bottom ends of the two connecting plates of the auxiliary foot contact the ground.

[0012] Furthermore, the drawing board is made of plastic, and four elastic buckles are integrally provided at the four corners of the skateboard. The elastic buckles can press the edges or corners of the canvas or drawing paper on the skateboard.

[0013] Furthermore, the second support rod includes a core tube and a sleeve. The core tube is coaxially and slidably inserted into the sleeve and connected to the sleeve by a compression spring. The sleeve has a locking hole near its top end. The core tube has a sliding pin that is elastically slidably arranged radially near its bottom end. As the sliding pin slides outward within the tube hole of the sleeve, its end is elastically locked into the locking hole when it reaches its farthest point.

[0014] Furthermore, a guide post is fixed radially inside the tube hole of the core tube, and the sliding pin is axially slidably sleeved on the guide post. The sliding pin has a return spring connected to the end of the guide post inside, and the sliding pin is springed into the locking hole by the elastic force of the return spring.

[0015] Furthermore, the locking hole is sealed by a spherical elastic cover, and when the sliding pin is engaged in the locking hole, it does not contact the elastic cover; pressing the elastic cover can completely disengage the sliding pin from the locking hole, so that the second support rod can return to its axial elastic extension and contraction state.

[0016] Furthermore, a hollow tail box is fixed to the end of the multi-functional box panel opposite to the end from which the telescopic frame slides out. The space inside the tail box is used to store the support accessories and sketching tools. The top surface of the tail box has a removable cover.

[0017] Furthermore, the bottom edge of the cover has several pins, each pin having a hole near its bottom; the top of the first support rod is fixed to the rotating shaft rotatably mounted on the multi-functional box plate, the drive gear meshes with a driven gear rotatably mounted inside the multi-functional box plate, the driven gear meshes with a rack vertically slidably mounted inside the multi-functional box plate, and the rack has a smooth inner surface on the side opposite to the driven gear.

[0018] In the side wall of the vertical bar hole for vertical sliding installation of the rack in the multi-functional box plate, a safety pin that can be inserted into the insertion hole is also horizontally slidably installed. Both ends of the safety pin are hemispherical, and a collar is integrally fixed at one end near the vertical bar hole. The collar can slide horizontally within the wall of the vertical bar hole and is elastically connected to a cylindrical spring in the side wall of the vertical bar hole. One end of the safety pin can be located inside the vertical bar hole. Only when the first support rod is rotated out of the multi-functional box plate to the limit position, the smooth side of the driven rack just separates from one end of the safety pin. At this moment, the safety pin completely exits the insertion hole and releases the insertion pin.

[0019] The beneficial effects of this invention are as follows: This adjustable-angle portable outdoor sketching stand features a simple and compact structure with an integrated design that significantly improves outdoor portability while balancing weight distribution and support stability. Specifically: This invention uses a hollow, enclosed multi-functional box panel as the main body of the equipment. All telescopic support structures and the drawing board are housed inside the box panel, achieving a completely enclosed folding storage with no exposed support or drawing board, greatly reducing the storage volume and making it convenient for users to carry in their backpacks. Simultaneously, the multi-functional box panel serves two purposes; when unfolded, it can be used directly as a sketching stool, eliminating the need to carry a separate sketching stool, significantly improving the equipment's integration. When the user sits on the top surface of the box panel, their own weight provides downward counterweight to the entire support system, eliminating the need for additional counterweights. Without increasing the equipment's weight, this invention completely solves the problems of traditional supports being lightweight, prone to tipping in strong winds, and having unstable support foundations, perfectly balancing lightweight design with outdoor wind resistance and anti-sway support performance.

[0020] Furthermore, the ease of adjustment is achieved through stepless angle adjustment of the drawing board. This invention utilizes an elastic damping hinge combined with a torsion spring to achieve adaptive flipping of the drawing board, allowing it to hover at any tilt angle and preventing spontaneous rotation without external force. To achieve the effect of automatic flipping and springing back after sliding out of the drawing board, the elasticity of the torsion spring or similar elastic element used in the elastic damping hinge can be adjusted during manufacturing. This is supplemented by manual active flipping to correct the tilt angle and tightening with locking bolts to achieve the optimal sketching angle for the drawing board.

[0021] Furthermore, this invention features multi-point support, employing a centrally hinged first strut and an axially elastically telescopic second strut as the main support structure. The struts slide in tandem, causing the telescopic frame to move horizontally outwards. Once the struts reach their maximum extension, an automatic locking structure locks the length, preventing the support structure from retracting under stress and ensuring the rigidity of the main support system. Simultaneously, the user's own weight presses down on the cross struts, further preventing displacement of the support structure. The two pairs of cross struts and the parallel pair of support rods, once rotated out, form a multi-point ground support system. Combined with V-shaped adaptive auxiliary feet, this further increases support points and enhances stability. When the support rods are designed as telescopic rods, they are more adaptable to complex terrain, while remaining convenient to store and smaller in size, improving the stability of the support when placed on the ground. Additionally, because the two connecting plates can be quickly folded together via a sliding sleeve during storage, allowing the support to fully conform to the struts, no extra storage space is required. The unfolding and folding modes can be switched with a single button, making operation simple and effortless.

[0022] Finally, this invention also integrates a closed storage compartment with a linked safety locking structure to achieve integrated tool storage and eliminate the risk of accidental opening. The multi-functional box panel of this invention features an integrated closed tail panel, which can conveniently store painting tools and bracket repair and assembly parts, eliminating the need to carry a separate tool bag and further enhancing the equipment's integrated portability. Simultaneously, a linked safety locking mechanism with gears and racks is designed to link the bracket's unfolded state with the storage lid's opening permission: when the bracket is folded, the safety pin automatically locks the lid's latch, preventing the storage compartment from opening and preventing tools from falling during transport; when the bracket is fully unfolded, the locking structure automatically releases, allowing the lid to be opened to retrieve tools, structurally eliminating the risk of accidental opening and improving the safety of equipment handling and storage.

[0023] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an adjustable-angle portable outdoor sketching stand in the present invention when it is stored. Figure 2 This is a schematic diagram of the sketching support in this invention when the drawing board has not yet completely slid out of the multi-functional box panel; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the sketching support in this invention when the drawing board has completely slid out of the multi-functional box and popped out. Figure 5 for Figure 4 Enlarged view of point B in the middle; Figure 6 for Figure 5 Enlarged view at point F; Figure 7 This is a schematic diagram of the sketching support in this invention after it has been installed. Figure 8 for Figure 7 Enlarged view of point C in the middle; Figure 9 for Figure 8 Enlarged view of point G in the middle; Figure 10 This is a simplified top view of a telescopic frame; Figure 11 A schematic diagram illustrating the hinged installation of the drawing board and the outer sliding plate of the telescopic frame; Figure 12 A schematic diagram illustrating the installation of the support foot at the bottom of the second support rod; Figure 13 This is a schematic diagram showing the second strut being locked in place by a sliding pin when it extends to its limit position. Figure 14 A structural diagram showing the structure when a tail box panel is fixed to a multi-functional box panel; Figure 15 for Figure 14 Enlarged view of point D in the middle.

[0025] In the diagram: 1. Multifunctional box panel; 2. Drawing board; 201. Protruding ridge; 202. Rotating column; 3. Telescopic frame; 301. Outer sliding plate; 30101. Protrusion; 302. Inner sliding plate; 303. Guide rod; 304. Tension spring; 4. First support rod; 5. Second support rod; 501. Core tube; 502. Sleeve; 6. Auxiliary support foot; 601. First connecting plate; 602. Second connecting plate; 7. Support rod; 8. Sliding block; 9. Limiting block; 10. Compression spring; 11. Sliding pin; 12. Guide column; 13. Return spring; 14. Elastic cover; 15. Tail box panel; 16. Cover; 17. Pin; 18. Rotating shaft; 19. Driving gear; 20. Driven gear; 21. Rack; 22. Vertical bar hole; 23. Safety pin; 24. Shaft collar; 25. Cylindrical spring; 26. Insertion hole; 27. Locking bolt. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] Please see Figures 1-4 This invention provides a technical solution: an adjustable-angle portable outdoor sketching stand, the main body of which is a hollow, enclosed multi-functional box panel 1 with a certain thickness. This multi-functional box panel 1 has dual core functions: firstly, it houses the entire telescopic and foldable support structure and the drawing board 2, allowing for complete folding and storage of the stand; secondly, when fully unfolded, the stand can be used directly as a sketching stool for the user, eliminating the need to carry an additional outdoor stool, thus improving the integration of the equipment and its convenience for outdoor use. Simultaneously, when the user sits on the multi-functional box panel 1, their own weight provides a stable downward counterweight to the bottom of the entire stand, completely solving the shortcomings of traditional sketching stands such as light weight, susceptibility to being blown over by strong winds outdoors, and unstable support foundations, making the entire stand installation more secure. In specific manufacturing, a horizontal sliding track can be pre-reserved at the upper part of the multi-functional box panel 1 for the installation of the telescopic frame 3 of the drawing board 2, which is adapted to the track and can slide horizontally back and forth along the inside of the multi-functional box panel 1. The outer side of the telescopic frame 3 is hinged to the drawing board 2 via an elastic damping hinge. When the drawing board 2 slides out of the multi-functional box panel 1, it can be specifically designed to flip upwards directly due to the elastic force. Figure 4The position shown, or the magnitude of the elastic damping force, is designed to allow the drawing board 2 to be temporarily suspended at any angle of rotation, preventing the drawing board 2 from rotating on its own without external force. In this case, the drawing board 2 needs to be manually flipped upwards when unfolded. The top of the first support rod 4 is rotatably mounted on the side of the inner side wall of the multi-functional box panel 1 away from the horizontal sliding direction of the telescopic frame 3. A corresponding limiting protrusion or similar structure can be set on the bottom side of the multi-functional box panel 1 to limit the extreme position of the first support rod 4 to rotate outwards, facilitating support and force. At the same time, the middle of the first support rod 4 and the middle of the second support rod 5 are cross-hinged, and the two can rotate relative to each other around the cross-hinging point. The second support rod 5 adopts an axial elastic telescopic structure, and its length can adaptively change. It can autonomously expand and contract under axial tension or pressure. The top telescopic end of the second support rod 5 is hinged to a fixed slider 8, which is fastened to the bottom surface of the side of the telescopic frame 3 that always remains inside the multi-functional box panel 1. In actual outdoor use, the telescopic frame 3 is manually pulled outward, or the first support rod 4 is flipped downward to expose the multi-functional box panel 1 and separate the two support rods. The first support rod 4 rotates outward around its rotational connection point with the multi-functional box panel 1, and the second support rod 5 hinges and rotates around its intersection point with the first support rod 4. Alternatively, it can be quickly hinged and rotated with manual assistance to drive the slider 8 to slide outward along the inside of the multi-functional box panel 1, thereby pushing the telescopic frame 3 to slide outward from the multi-functional box panel 1. When the second support rod 5 is extended to its maximum length, the drawing board 2 is completely moved out of the multi-functional box panel 1. At this time, relying on the elastic damping hinge structure at the hinge position, the drawing board 2 automatically flips upward, or the user can manually flip the drawing board 2 upward to the corresponding angle to adapt to the tilt angle required for sketching. According to the design structure of this embodiment, the position where the second support rod 5 is extended to its maximum length is the position when the slide plate is fully slid out. Therefore, an automatic locking structure is provided on the second support rod 5. Once it reaches this position, it automatically locks and fixes itself, keeping the second support rod 5 fixed as a whole for use as a stool leg support. After the support frame is deployed and the user sits on the top surface of the multi-functional box panel 1, its own weight further compresses the entire strut support system, preventing displacement of the cross-hinged first strut 4 and second strut 5. This significantly enhances the support structure's wind and sway resistance. In specific manufacturing processes, such as... Figure 11 Two rotating columns 202 are symmetrically fixed to the bottom side of the drawing board 2. These columns are rotatably installed inside the telescopic frame 3, allowing the drawing board 2 to rotate freely and adjust its tilt angle. In general design and manufacturing, elastic damping hinges can be achieved using existing technology, employing the most commonly used torsion spring (not shown in the figure) to achieve the purpose of elastic damping hinges. This, in conjunction with the rotating columns 202, enables elastic rotational connection, allowing the slide to pop out due to the torsion spring action when sliding out of the multi-functional box board 1, or with manual assistance to flip and pop out. In general designs, the slide can be popped out purely by relying on the torsion force of the torsion spring. Figure 4 The location shown. Furthermore, as... Figure 11As shown, the side wall of the telescopic frame 3 corresponds to the end position of one of the rotating columns 202, where a locking bolt 27 can be installed. If the angle of the automatic or manual rotation of the slide is not suitable, it can be further manually rotated and adjusted. When the drawing board 2 is rotated to the precise tilt angle suitable for sketching, the locking bolt 27 is tightened in the forward direction. The end of the locking bolt 27 directly axially presses against the corresponding rotating column 202, and the friction generated by the pressing locks the rotational freedom of the rotating column 202, thus fixing the angle of the drawing board 2 and preventing the angle of the drawing board 2 from shifting during the sketching process.

[0030] In this embodiment, as Figure 5 , Figure 7 , Figure 8 , Figure 10 As shown, the telescopic frame 3 is composed of two interlocking strip-shaped outer sliding plate 301 and inner sliding plate 302. The outer side of the outer sliding plate 301 is used to hinge the drawing board 2 via an elastic damping hinge, while the bottom surface of the inner sliding plate 302 is used to fix and connect the slider 8 of the support structure. At the ends where the outer sliding plate 301 and the inner sliding plate 302 are close to each other, as shown... Figure 10 As shown, a support rod 7 is hinged to each of the two sides. A tension spring 304 is parallel to each of the two support rods 7, with both ends of the tension spring 304 fixed to the opposing inner sidewalls of the outer slide plate 301 and the inner slide plate 302, respectively, to achieve an elastic connection. When the two support rods 7 are horizontally retracted and fitted between the two slide plates, the tension spring 304 always remains in a stretched, energy-stored state. In specific installation and use, one end of each support rod 7 is hinged to the inner sidewall of the outer slide plate 301, as shown. Figures 7-8 The other end can be rotated downwards out of the telescopic frame 3. After the support rod 7 is rotated out, its bottom end directly touches the ground to primarily support the slide. Together with the first support rod 4 and the second support rod 5, it forms a multi-point support structure, further improving the overall stability of the telescopic frame 3 and the drawing board 2, and preventing the support from tipping over. In addition, to make the telescopic frame 3 move more smoothly, such as Figures 5-6 , Figures 8-10 As shown, two guide rods 303 are arranged parallel to the support rod 7 inside the outer slide plate 301 and the inner slide plate 302. One end of the guide rod 303 is fastened to the inner side of the outer slide plate 301, and the other end passes through the inner slide plate 302 to achieve sliding engagement, i.e. Figures 4-6 and Figures 7-8The comparative diagram shows that the outer sliding plate 301 can move closer to the inner sliding plate 302 under the action of the guide rod 303. In order to fully ensure the sliding stroke, the end of the guide rod 303 extends into the cavity of the multi-functional box plate 1. The aforementioned tension spring 304 is correspondingly sleeved on the outside of the two guide rods 303. The guide rods 303 restrict the tension spring 304 to extend and retract smoothly, ensuring that the spring performs axial extension and retraction, and improving the extension and retraction reliability of the telescopic frame 3. In actual operation, after the drawing board 2 is completely removed from the multi-functional box plate 1, the user turns down the two support rods 7 to support the drawing board 2. At this time, the tension spring 304 releases part of the tension, pulling the outer sliding plate 301 to move closer to the inner sliding plate 302, automatically shortening the overall length of the telescopic frame 3, reducing the overall space occupied by the bracket after it is unfolded, and also to make the drawing board 2 closer to the multi-functional box plate 1. Otherwise, due to size factors, the sliding plate may be far away from the user after sitting down, making it inconvenient for sketching.

[0031] In this embodiment, the rotating installation of the drawing board 2 is as follows: Figure 11 As shown, a protrusion 30101 is integrally formed by an upward protrusion on the upper edge of the outer sliding plate 301. The inner side of the protrusion 30101 encloses a mounting groove with a [-shaped cross section]. The bottom of the mounting groove is machined into a smooth arc-shaped surface to fit the protruding ridge 201 mentioned below, thereby reducing structural jamming during the rotation of the drawing board 2. More specifically, as Figure 11 The bottom of the drawing board 2 has an integrally formed cylindrical protruding ridge 201. The protruding ridge 201 is placed inside the mounting groove with an arc-shaped bottom. The left and right ends of the protruding ridge 201 are coaxially fixed to the aforementioned rotating column 202. The two rotating columns 202 are respectively rotatably assembled in the two opposite side walls of the mounting groove, so that the drawing board 2 can smoothly tilt and rotate around the rotating column 202. One of the rotating columns 202 has a shallow circular groove on its outer end face. The locking bolt 27 is mounted on the side wall of the protrusion 30101 of the outer slide plate 301. The locking bolt 27 is divided into a threaded fastening section and a smooth front end section. When the user rotates the drawing board 2 to a suitable drawing angle, the locking bolt 27 is screwed in. The threaded section secures the locking bolt 27 itself, and the smooth front end section is coaxially inserted into the shallow groove on the end face of the rotating column 202. By axially compressing the end face of the rotating column 202, the rotation of the rotating column 202 can be completely locked. At the same time, the smooth end section will not wear the inner wall of the shallow groove. Slightly loosening the locking bolt 27 allows for the flexibility to rotate the drawing board 2 again, improving the service life of the angle locking structure. In addition, the shallow groove allows the locking bolt 27 to be quickly aligned, improving the ease of angle fixing.

[0032] In this embodiment, as Figure 4 , Figure 7 As shown, a V-shaped auxiliary support 6 is installed at the bottom end of the second support rod 5, see also Figure 12The auxiliary support 6 is formed by hinged connection of two symmetrically arranged first connecting plates 601 and second connecting plates 602. In actual manufacturing, the two connecting plates can still use the most common torsion spring structure to ensure that they remain separated from each other and maintain a V-shaped layout under normal conditions. Furthermore, a limiting block 9 with a built-in U-shaped groove is fixed at the bottom of the second support rod 5. The central hinge axis of the two connecting plates is located inside the U-shaped groove of the limiting block 9, which restricts the maximum opening angle of the connecting plates. Simultaneously, when the auxiliary support 6 is on the ground, it provides solid support. Additionally, a rectangular sliding sleeve (not shown in the figure) can be used in conjunction with the auxiliary support 6. The inner diameter of the sliding sleeve matches the shape of the two connected plates after they are closed. When storing the support, the two connecting plates are pressed inward against the torsion spring force, and then the rectangular sliding sleeve is placed on the outside of the closed connecting plates. The inner wall of the sliding sleeve tightens the two connecting plates, keeping them in an overlapping and closed state, allowing them to rotate to overlap with the second support rod 5, thus reducing the storage volume of the support. When using the outdoor deployment bracket, the outer rectangular sliding sleeve must first be removed. The two connecting plates will automatically spring outward under the elastic reset action of the torsion spring until the two connecting plates respectively abut against the two side walls of the U-shaped groove of the limiting block 9, thus completing the opening limit. At this time, the bottom ends of the two connecting plates of the V-shaped auxiliary foot 6 can contact the ground to increase the installation stability of the second support rod 5.

[0033] In this embodiment, considering the storage structure and overall balance of the drawing board 2, the drawing board 2 is made of lightweight, high-strength engineering plastic through one-piece injection molding. Compared with metal plates, it is lighter in weight, which meets the needs of outdoor portability. It is also waterproof, impact-resistant, and not easily deformed, making it suitable for the complex outdoor environment exposed to wind and sun. It is also easy to disassemble and clean. Each of the four corners of the canvas 2 panel has an integrally formed elastic buckle (not shown in the figure). The elastic buckle and the canvas 2 panel are an integral structure, which can be injection molded in one piece without the need for additional assembly parts, and there will be no problem of the buckle falling off. The elastic buckle has elastic deformation capability. When in use, you can directly lift the elastic buckle of the four corners, place the four corners of the canvas or drawing paper under the buckle, and after releasing the elastic buckle, the elastic restoring force will automatically press the edges and corners of the canvas or drawing paper to a tighter position. There is no need to use additional tape or clips to fix the drawing materials. The installation and removal of drawing paper is convenient and efficient. At the same time, the elastic buckle makes soft contact with the drawing materials and will not scratch the paper or canvas surface, which meets the needs of outdoor sketching for quick paper replacement and fixing of drawing materials.

[0034] In this embodiment, as Figure 4 and Figure 13As shown, the elastic telescopic structure of the second support rod 5 specifically comprises two tubular sections, a core tube 501 and a sleeve 502, coaxially connected. The core tube 501 is slidably inserted inside the sleeve 502. A compression spring 10 is installed between the bottom of the core tube 501 and the inner bottom of the sleeve 502. The compression spring 10 is in a pre-compressed state, relying on the spring force to achieve the overall axial elastic telescopic movement of the second support rod 5 and drive the slider 8 to move. Figure 13 A radially penetrating locking hole (not shown in the figure) is opened on the tube wall near the upper end of the sleeve 502. A radially sliding pin 11 is installed on the tube wall near the lower end of the core tube 501. The sliding pin 11 can slide radially inward and outward along the tube wall of the core tube 501. During the normal deployment of the support, as the core tube 501 slides relative to the sleeve 502, the sliding pin 11 moves upward synchronously with the core tube 501 and slides and presses against the tube hole of the sleeve 502. However, when the second support rod 5 extends to the preset limit length, that is, when the slider 8... Figures 4-5 as well as Figures 7-8 At the position shown, the sliding pin 11 moves to the position aligned with the locking hole of the sleeve 502. Under the action of its own internal elastic structure, the sliding pin 11 slides outward radially, and its end automatically locks into the locking hole of the sleeve 502, thereby locking the axial position of the core tube 501 and the sleeve 502, fixing the overall length of the second support rod 5, preventing the second support rod 5 from accidentally retracting during the sketching process, and ensuring the stability of the support.

[0035] In the specific production process, such as Figure 13 A guide post 12 can be fixed radially inside the cavity of the core tube 501. The axis of the guide post 12 is consistent with the sliding direction of the sliding pin 11. A through hole is opened in the middle of the sliding pin 11 and it is slidably sleeved on the outside of the guide post 12. The guide post 12 restricts the sliding trajectory of the sliding pin 11, ensuring that the sliding pin 11 only slides horizontally radially and will not deviate or jam. A return spring 13 is installed in the cavity inside the sliding pin 11. One end of the return spring 13 is connected to the inner wall of the sliding pin 11, and the other end is fixed to the end of the guide post 12. Under normal conditions, the return spring 13 continuously provides the sliding pin 11 with an outward elastic force. When the core tube 501 slides relative to the sleeve 502 to the position of the locking hole, the return spring 13 directly pushes the sliding pin 11 to slide outward, so that the end of the sliding pin 11 is stably locked into the locking hole. When the second support rod 5 needs to be retracted for subsequent storage, the sliding pin 11 can be pressed inward to overcome the elastic force of the return spring 13 to release the lock. The overall sliding structure is simple and reliable.

[0036] In this embodiment, as Figure 13A spherical elastic cover 14 is sealed and bonded to the locking port on the outer side of the sleeve 502. The elastic cover 14 completely covers the outer opening of the locking hole, and the inside of the elastic cover 14 has reserved clearance space. When the sliding pin 11 is inserted into the locking hole, the end of the sliding pin 11 will not contact the elastic cover 14, and will not affect the normal locking effect. When it is necessary to retract the second support rod 5 and release the length lock, the user directly presses the spherical elastic cover 14 inward. The elastic cover 14 deforms inward under force, directly pushing the sliding pin 11 inside the locking hole to retract inward, forcing the sliding pin 11 to completely disengage from the locking hole, and quickly releasing the locking state of the core tube 501 and the sleeve 502. After unlocking, the elastic cover 14 is released, and the elastic cover 14 automatically resets due to its own material elasticity, re-sealing the outer opening of the locking hole, preventing outdoor dust and sand from entering the sleeve 502, avoiding dust from getting stuck in the sliding structure inside the support rod, and also preventing fingers from being injured when directly pressing the end of the sliding pin 11.

[0037] In this embodiment, a storage extension structure is specifically added to store sketching tools and auxiliary tools for assembling and disassembling the sketching stand. For example, it can be like... Figure 1 , Figure 2 , Figure 7 as well as Figures 14-15 As shown, at the rear end of the multi-functional box panel 1, away from the sliding port of the telescopic frame 3, a hollow and sealed tail box panel 15 is integrally fixed. The interior of the tail box panel 15 can be configured to form an independent closed storage cavity as needed. The cavity can be used to store sketching tools such as pencils, erasers, pencil sharpeners, palettes, and small brushes. It can also store small tools or accessories used for assembling and disassembling the bracket, such as hex wrenches for tightening the locking bolts 27, or sliding sleeves for disassembling the auxiliary feet 6. Users do not need to carry an extra tool bag, improving the integrated portability of the bracket. Specifically, there is an opening at the top of the tail box panel 15, and a removable cover 16 is fitted at the opening. The cover 16 and the tail box panel 15 adopt a plug-in assembly structure. When it is necessary to access the tools inside, the cover 16 can be removed directly. After storage, the cover 16 can be fastened to close the storage cavity, preventing outdoor rainwater and dust from entering and contaminating the sketching tools. The overall structure is integrated with the multi-functional box panel 1, without adding extra space to the bracket.

[0038] In this embodiment, as Figures 14-15As shown, a specially designed linkage safety locking structure is provided. Several vertical pins 17 are evenly distributed at the bottom edge of the cover 16. At least one pin 17 near the bottom edge of the multi-functional box panel 1 has a hole 26. A drive gear 19 is coaxially fixed to the rotating shaft 18, which is rotatably connected to the first support rod 4 and the multi-functional box panel 1. The drive gear 19 meshes with a driven gear 20, which is rotatably mounted in the internal cavity of the multi-functional box panel 1. The driven gear 20 meshes with a vertically arranged rack 21 on its side. The side of the rack 21 away from the driven gear 20 is smoothed. Vertical slots 22 are provided on the side wall of the multi-functional box panel 1, and the rack 21 slides vertically up and down along the inside of these slots. A safety pin 23 is horizontally slidably mounted inside the side wall of the vertical slot 22. Both ends of the safety pin 23 are machined into hemispherical arc structures to prevent jamming and scraping during sliding. One end of the safety pin 23 near the inside of the vertical slot 22 is integrally formed with a collar 24. The collar 24 is slidably mounted in the horizontal groove of the side wall of the vertical slot 22. A cylindrical spring 25 is connected to the rear side of the collar 24. The cylindrical spring 25 provides the safety pin 23 with an outward pushing force. When the sketching stand is installed, one end of the safety pin 23 is kept inside the vertical slot 22 and disengaged from the pin 17. At this time, the cover 16 is in the open state so that tools or items in the tail box 15 can be retrieved when using the sketching stand. When the sketching stand is not in use, i.e., in the stowed state, as the first support rod 4 is fully inserted into the multi-functional box plate 1, the rack 21 moves upward to its limit and abuts against the end of the safety pin 23, pressing the safety pin 23 to the outside. The safety pin 23 is then inserted laterally into the insertion hole 26 of the pin 17, thereby locking the cover 16 and preventing it from being opened. This prevents tools and items from falling out if the cover 16 is accidentally opened when the sketching stand is not in use. The cover 16 can only be opened after the sketching stand is fully extended. If the sketching stand needs to be unfolded again, when the first support rod 4 is rotated outward to the maximum unfolding limit position, the rack 21 moves down with the gear transmission. The smooth side of the rack 21 slides down to a position where it does not contact the safety pin 23, and no longer blocks the safety pin 23. Under the elastic force of the cylindrical spring 25, the safety pin 23 slides laterally out of the insertion hole 26, releasing the lock on the insertion pin 17. Only then can the cover 16 be removed to access the internal tools, realizing the linkage safety protection between the unfolded state of the stand and the opening of the storage cover, preventing accidental opening of the cover when the stand is in the storage state.

[0039] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A portable outdoor sketching stand with adjustable angle, characterized in that: The system includes a hollow multi-functional box panel (1), with a telescopic frame (3) horizontally slidably mounted on the upper part of the multi-functional box panel (1). A drawing board (2) is elastically damped and hinged to the outer side of the telescopic frame (3). The top of a first support rod (4) is rotatably mounted on the bottom side of the multi-functional box panel (1) away from the sliding direction of the telescopic frame (3). The first support rod (4) and a second support rod (5) are cross-hinged. The second support rod (5) is an axially elastic telescopic rod, and a slider (8) is hinged to its top telescopic end. The bottom surface of the telescopic frame (3) is always located inside the multifunctional box plate (1); when the bracket is unfolded, the first support rod (4) rotates around the fixed point, and the second support rod (5) rotates around the hinge point with the first support rod (4) while sliding the slider (8) towards the outside of the multifunctional box plate (1). The second support rod (5) elastically extends adaptively until the second support rod (5) extends to the limit. The entire slide plate is exposed outside the multifunctional box plate (1) and flips upward to the set tilt angle based on the elastic damping hinge. Two rotating columns (202) are fixed opposite to each other on the bottom side of the slide plate. The rotating columns (202) are rotatably installed in the telescopic frame (3), and at least one rotating column (202) has a locking bolt (27) installed on the telescopic frame (3) directly opposite to its end. When the slide plate is rotated to the required tilt angle, the locking bolt (27) is tightened to axially tighten and fix the rotating column (202).

2. The adjustable-angle portable outdoor sketching stand according to claim 1, characterized in that: The telescopic frame (3) includes a strip-shaped outer slide plate (301) and an inner slide plate (302). The outer slide plate (301) is used to hinge the slide plate, and the inner slide plate (302) is used to fix the slider (8). A support rod (7) is fixed at the end of each of the two slide plates, and a tension spring (304) is set parallel to the support rod (7) and used to elastically connect the two slide plates. When the support rod (7) is horizontally located between the two slide plates, the tension spring (304) is in a stretched state. One end of the support rod (7) is hinged to the side of the outer slide plate (301) used to connect the tension spring (304), and the other end is turned downward out of the telescopic frame (3) to contact the ground support to assist in supporting the telescopic frame (3) and the drawing board (2). Two guide rods (303) are also provided in the center between the two slides, parallel to the support rod (7). One end of the guide rod (303) is fixed on the outer slide (301), and the other end slides through the inner slide (302) and is located inside the multi-functional box plate (1). The tension spring (304) is sleeved on the guide rod (303) between the two slides so that when the slide is fully exposed to the multi-functional box plate (1) and the support rod (7) can be turned downwards, the two slides will move closer to each other and shorten the distance between the slide and the multi-functional box plate (1).

3. The adjustable-angle portable outdoor sketching stand according to claim 2, characterized in that: The outer sliding plate (301) has an upwardly protruding structure at its edge, and a [-shaped mounting groove is formed inside the protrusion (30101). The bottom of the mounting groove is curved into an arc shape. The bottom of the sliding plate has a columnar protrusion (201). The protrusion (201) is located in the mounting groove, and the two ends of the protrusion (201) are fixed with the rotating column (202). At least one rotating column (202) has a shallow groove inside its end face. When the locking bolt (27) is fastened to the side of the protrusion (30101), the smooth column section at the end of the locking bolt (27) is coaxially inserted into the shallow groove and axially presses the rotating column (202).

4. The adjustable-angle portable outdoor sketching stand according to claim 1, characterized in that: The bottom end of the second support rod (5) is also provided with a V-shaped auxiliary foot (6). The auxiliary foot (6) is made of two connecting plates that are hinged to each other by a torsion spring elastic damping. The bottom end of the second support rod (5) is also fixed with a limiting block (9) with a U-shaped groove. The hinge axis of the two connecting plates is located in the limiting block (9). It also includes a rectangular sliding sleeve, which is fitted over the outside of the two connecting plates to hold them together and overlap them. When the sliding sleeve is removed, the two connecting plates automatically spring open and come into contact with the two opposite slots of the U-shaped groove, so as to assist the two connecting plates of the support (6) in contacting the ground.

5. The adjustable-angle portable outdoor sketching stand according to claim 1, characterized in that: The drawing board (2) is made of plastic and has four elastic buckles integrated at the four corners of the skateboard. The elastic buckles can press the edges or corners of the canvas or drawing paper on the skateboard.

6. The adjustable-angle portable outdoor sketching stand according to claim 1, characterized in that: The second support rod (5) includes a core tube (501) and a sleeve (502). The core tube (501) is slidably inserted into the sleeve (502) and connected to the sleeve (502) by a compression spring (10). The sleeve (502) has a locking hole near the top of the tube wall. The core tube (501) has a sliding pin (11) that is elastically slidably arranged along its radial direction near the bottom. When the sliding pin (11) slides outward in the tube hole of the sleeve (502), the end of the sliding pin (11) is locked into the locking hole under elastic action when it slides to the farthest point.

7. The adjustable-angle portable outdoor sketching stand according to claim 6, characterized in that: A guide post (12) is fixed radially inside the tube hole of the core tube (501). The guide post (12) is axially slidably fitted with the sliding pin (11). The sliding pin (11) has a return spring (13) connected to the end of the guide post (12). The sliding pin (11) is springed into the card hole by the elastic force of the return spring (13).

8. The adjustable-angle portable outdoor sketching stand according to claim 6, characterized in that: The locking hole is sealed by a spherical elastic cover (14), and when the sliding pin (11) is inserted into the locking hole, it does not contact the elastic cover (14); pressing the elastic cover (14) can make the sliding pin (11) completely exit the locking hole, so that the second support rod (5) can return to the axial elastic extension state.

9. The portable outdoor sketching stand with adjustable angle according to claim 1, characterized in that: The multifunctional box panel (1) has a hollow tail box panel (15) fixed to the end opposite to the end from which the telescopic frame (3) slides out. The space inside the tail box panel (15) is used to store the bracket accessories and tools used for sketching. The top surface of the tail box panel (15) has a removable cover (16).

10. The adjustable-angle portable outdoor sketching stand according to claim 9, characterized in that: The bottom edge of the cover (16) has several pins (17), and each pin (17) has a hole (26) near the bottom. The top of the first support rod (4) is fixed with a drive gear (19) on a rotating shaft (18) that is rotatably mounted on the multi-functional box plate (1). The drive gear (19) meshes with a driven gear (20) that is rotatably mounted inside the multi-functional box plate (1). The driven gear (20) meshes with a rack (21) that is vertically slidably mounted inside the multi-functional box plate (1). The rack (21) is smooth on the side away from the driven gear (20). In the side wall of the vertical bar hole (22) in the multi-functional box plate (1) for the rack (21) to be vertically slidably installed, a safety pin (23) that can be inserted into the insertion hole (26) is also horizontally slidably installed. Both ends of the safety pin (23) are hemispherical. A collar (24) is integrally fixed at one end of the vertical bar hole (22). The collar (24) can slide horizontally in the hole wall of the vertical bar hole (22) and is elastically connected to the cylindrical spring (25) in the side wall of the vertical bar hole (22). One end of the safety pin (23) can be located in the vertical bar hole (22). Only when the first support rod (4) is rotated out from the multi-functional box plate (1) to the limit position, the smooth side of the driven rack (21) is just separated from one end of the safety pin (23). At this moment, the safety pin (23) completely exits the insertion hole (26) and releases the insertion pin (17).

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