Portable folding outdoor sketching easel

Abstract

The invention discloses a portable folding outdoor sketching easel which is characterized in that a first drawing board fixing frame and a second drawing board fixing frame are connected through an X structure frame composed of a first connecting rod and a second connecting rod, and meanwhile, the first drawing board fixing frame and the second drawing board fixing frame are unfolded or folded on a third fixing frame in a sliding manner through a fifth cylindrical sliding block; the first drawing board fixing frame, the second drawing board fixing frame, the first connecting rod and the second connecting rod jointly form a drawing board clamping structure; when the drawing board clamping structure is unfolded, the drawing board clamping structure and a fifth cylindrical sliding block are connected into a whole through a hinge column and can rotate around a rotating block, and the horizontal drawing board clamping state and the vertical drawing board clamping state are achieved; the drawing board clamping structure can rotate around a middle hinge column of the third fixing frame in a closed state, so that all the components are parallel in the length direction. The rotating block can rotate around the through hole in the support, pitching of the drawing board clamping structure is achieved, and the optimal drawing angle is achieved. The portable folding outdoor sketching easel can be integrally folded, is easy to install, store and carry, and is compact in structure.

Description

Technical Field

[0001] This invention belongs to the field of painting tools technology, and in particular relates to a portable folding outdoor sketching easel. Background Technology

[0002] As a core tool for outdoor sketching, the easel needs to be portable, stable, and easy to adjust. Outdoor sketching easels are mostly made of lightweight aluminum or wood, and are detachable for artists to carry when sketching in mountains, forests, lakesides, and other sketching locations.

[0003] However, existing technologies have obvious shortcomings: the support legs are mostly made of a single material, which makes them prone to tilting on rugged and uneven outdoor ground (such as hillsides and grasslands), affecting the stability of sketching; the installation process of detachable easels is cumbersome, and outdoor storage is inconvenient; although foldable easels have emerged, they still require partial disassembly and cannot achieve integrated folding. Summary of the Invention

[0004] The purpose of this invention is to provide a portable folding outdoor sketching easel to solve the technical problems mentioned in the background art.

[0005] The specific technical solution of the present invention is as follows: A portable folding outdoor sketching easel includes a drawing board fixing frame, a connecting rod, a third fixing frame, a rotating block, a bracket, a base, and supporting legs; The connecting rod includes a first connecting rod and a second connecting rod. The first connecting rod and the second connecting rod have the same structure and are generally U-shaped. The first connecting rod and the second connecting rod are provided with a first connecting hole in the middle. The drawing board holder includes a first drawing board holder and a second drawing board holder. The first drawing board holder and the second drawing board holder have the same structure and are generally U-shaped. Both the first and second drawing board holders have storage slots. The first connecting rod is hinged to the second connecting rod via a connector. After the first and second connecting rods are connected, they can rotate 90 degrees. When unfolded, they present a cross-X shape, which opens the first and second drawing board holders. When closed, they are rod-shaped and stored in the storage slots of the first and second drawing board holders. In the folded state, the boss of the first drawing board holder engages with the first groove of the second drawing board holder in an interlocking manner. The first groove of the first drawing board holder engages with the boss of the second drawing board holder in an interlocking manner. The third fixing frame is generally in the shape of a long strip plate, with a cylindrical hinged post with a perforated boss in the middle area. The two connecting rods are fixed by passing through the first connecting holes on the first connecting rod and the second connecting rod. The first connecting rod and the second connecting rod rotate around the hinged post. The first drawing board fixing frame and the second drawing board fixing frame slide along the length of the third fixing frame. The rotating block has a block-shaped structure, and the rotating block is provided with a first threaded post. The first threaded post passes through the through hole in the middle of the hinge post and is used to fix the first connecting rod and the second connecting rod by means of a nut. The rotating block is used to fix the position of the third fixing frame. The bracket is connected to the rotating block; the bracket is fixed to the base plate. The support legs are fixed to the base plate and serve as the support structure for the easel.

[0006] Furthermore, the left vertical plate of the drawing board holder has a first guide groove along its length, and a second guide groove is distributed parallel above the first guide groove. The inner area between the two guide grooves has a storage groove extending along the length of the vertical plate. The bottom horizontal plate has multiple protrusions arranged at intervals along its length, and each protrusion has a corresponding recessed first groove on its side. A fifth cylindrical slider is installed on the top horizontal plate, and a semi-circular notch is provided on the side of the fifth cylindrical slider. The right vertical plate has a third guide groove along its length, and a fourth guide groove is distributed parallel above it. A cover plate is installed on the surface of the drawing board holder.

[0007] Furthermore, the left end of the connecting rod is provided with a first cylindrical slider, and a second cylindrical slider is coaxially distributed below the first cylindrical slider; the right end is provided with a third cylindrical slider, and a fourth cylindrical slider is coaxially distributed below the third cylindrical slider; a notch is provided at the bend, and a first connecting hole is provided on the side wall of the notch; the first connecting hole of the first connecting rod is hinged to the second connecting rod through a connector, and the notch serves as a clearance structure at the hinge; The first cylindrical slider and the second cylindrical slider of the first connecting rod cooperate with the third guide groove and the fourth guide groove of the first drawing board holder, respectively; the third cylindrical slider and the fourth cylindrical slider cooperate with the third guide groove and the fourth guide groove of the second drawing board holder, respectively; the first cylindrical slider and the second cylindrical slider of the second connecting rod cooperate with the first guide groove and the second guide groove of the first drawing board holder, respectively; the third cylindrical slider and the fourth cylindrical slider cooperate with the first guide groove and the second guide groove of the second drawing board holder, respectively.

[0008] Furthermore, the left side of the third fixing frame is provided with a first sliding groove extending along the length direction, and the end is connected to a first through groove with a notch; the right side is provided with a second sliding groove that is parallel to the first sliding groove and extends along the length direction, and the end is connected to a second through groove with a notch; the back of the middle part is provided with four evenly spaced circular grooves that cooperate with the rotating block for installation and positioning of related components.

[0009] The slider of the first drawing board holder engages with the first groove in the third holder, and the slider of the second drawing board holder engages with the second groove.

[0010] Furthermore, the rotating block-shaped structure has an arc-shaped curved surface on one side and a flat surface on the other side. It includes a side through hole and a uniformly distributed hemispherical groove on one side of the flat surface. The hemispherical groove corresponds to the circular groove. A first threaded post is located in the middle position. The first threaded post passes through the through hole in the middle of the hinge post and is fixed to the first connecting rod and the second connecting rod by a nut. A spring and a ball are placed in the groove. During the rotation of the third fixing frame, the ball sinks into the circular groove, thus fixing the position of the third fixing frame.

[0011] Furthermore, the support consists of a bottom cylindrical column and a U-shaped long groove. The bottom cylindrical column has a threaded through hole in the middle, and the U-shaped long groove has a third groove in the middle to provide movement space for the third fixed frame. The top two sides of the U-shaped long groove have a first through hole and a nut groove. The first through hole cooperates with the side through hole on the rotating block. The first bolt passes through the two holes to connect the support and the rotating block. The nut groove holds the nut and cooperates with the first bolt for fastening. By tightening the first bolt, the rotating block is fixed and can rotate around the first bolt to realize the tilt adjustment of the easel.

[0012] Furthermore, the substrate has a block structure with a first connecting block and a second connecting block arranged in a circular array around its edge. The sidewall of the first connecting block has a second connecting hole with a circular through hole, and the side of the second connecting block has a first threaded hole. The second connecting hole is coaxial with the first threaded hole. A second groove is provided between the first connecting block and the second connecting block. A stud is provided in the central area of ​​the substrate. The bracket is fixed to the substrate through the threaded through hole and the stud.

[0013] Furthermore, the support leg includes a first support leg and a second support leg. The first support leg is an elongated hollow rectangular rod structure with a central hole at its lower end, extending along the length of the rod to accommodate the second support leg. A guide groove running through the front of the first support leg along its length is provided for adjusting the position of the second support leg in conjunction with a second bolt. A circular second through hole is provided at the upper end of the first support leg for inserting a wing bolt to fix it to the substrate. The second support leg is a hollow elongated structure with a sharp tip at the bottom for easy insertion into a ground or other support surface. A second threaded hole is provided at the top of the second support leg for engaging with the second bolt to fix it to the first support leg. By placing the second support leg in the central hole of the first support leg and placing the second bolt in the guide groove and engaging with the second threaded hole, the second support leg can be fixed to the first support leg by tightening the second bolt.

[0014] Furthermore, the wing-shaped bolt is shaped like a butterfly wing, making it easy to tighten manually; the cylindrical head is located at the top of the wing-shaped bolt; the second threaded post is located below the cylindrical head, extending vertically and having external threads on its surface; the pin is located to the left of the second connecting hole and the second through hole, the second threaded post of the wing-shaped bolt is located in the first threaded hole, the cylindrical head is located to the right of the second through hole, the diameter of the first threaded hole is larger than the diameter of the second through hole, and the first support leg is fixed in the groove by tightening the wing-shaped bolt.

[0015] Furthermore, there are three sets of supporting legs, evenly distributed around the circumference.

[0016] The portable folding outdoor sketching easel of the present invention has the following advantages: 1. The first and second drawing board holders of this invention are connected by an X-structure frame composed of a first connecting rod and a second connecting rod. Simultaneously, the first and second drawing board holders slide open or close on a third holder via a fifth cylindrical slider. The first and second drawing board holders, the first connecting rod, and the second connecting rod together form a drawing board holding structure. When the drawing board holding structure is open, it is connected to the fifth cylindrical slider via a hinged column, allowing it to rotate around a rotating block, achieving both horizontal and vertical drawing board holding states. When the drawing board holding structure is closed, it can rotate around the central hinged column of the third holder, ensuring that all components are parallel in the length direction and reducing the storage volume.

[0017] 2. The rotating block can rotate around the through hole on the bracket to adjust the pitch of the aforementioned drawing board support structure, thereby achieving the optimal drawing angle.

[0018] 3. The portable folding outdoor sketching easel is supported by three legs. Each support leg includes a first support leg and a second support leg. The second support leg can slide linearly within the hole in the first support leg and is fixed by bolts. The support legs can rotate upward around the second connecting hole on the base plate and be parallel to the drawing board holding structure in the closed state. The height of each support leg can be adjusted at will, while further reducing the storage space. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a portable folding outdoor sketching easel according to the present invention; Figure 2 This is a diagram showing the folded state of a portable folding outdoor sketching easel according to the present invention; Figure 3 This is a schematic diagram of the vertical version of the present invention; Figure 4 This is a schematic diagram of the horizontal use of the present invention; Figure 5 This is a schematic diagram of the first drawing board fixing frame structure of the present invention; Figure 6 This is a schematic diagram of the first connecting rod structure of the present invention; Figure 7 This is a schematic diagram of the third fixing frame structure of the present invention; Figure 8 This is a schematic diagram of the rotating block structure of the present invention; Figure 9 This is a schematic diagram of the support structure of the present invention; Figure 10 This is a schematic diagram of the substrate structure of the present invention; Figure 11 This is a schematic diagram of the first support leg structure of the present invention; Figure 12 This is a schematic diagram of the butterfly bolt structure of the present invention; Figure 13 This is a schematic diagram of the second support leg structure of the present invention.

[0020] Explanation of markings in the diagram: 1. First drawing board holder; 1-1. First guide groove; 1-2. Second guide groove; 1-3. Storage groove; 1-4. Boss; 1-5. First groove; 1-6. Fifth cylindrical slider; 1-7. Semi-circular notch; 1-8. Third guide groove; 1-9. Fourth guide groove; 2. Cover plate; 3. First connecting rod; 3-1. First cylindrical slider; 3-2. Second cylindrical slider; 3-3. Third cylindrical slider; 3-4. Fourth cylindrical slider; 3-5. Notch; 3-6. First connecting hole; 4. Third holder; 4-1. First sliding groove; 4-2. First through groove; 4-3. Hinge post; 4-4. Second through groove; 4-5. Second sliding groove; 4-6. Circular groove; 5. Rotating block; 5-1. Side through hole; 5-2. Hemispherical groove; 5-3, First threaded post; 6, Connector; 7, First bolt; 8, Second connecting rod; 9, Second drawing board holder; 10, Support; 10-1, Threaded through hole; 10-2, Third groove; 10-3, First through hole; 10-4, Nut groove; 11, Base; 11-1, Second connecting hole; 11-2, First connecting block; 11-3, Second groove; 11-4, Stud; 11-5, Second connecting block; 11-6, First threaded hole; 12, Pin; 13, Wing bolt; 13-1, Cylindrical head; 13-2, Second threaded post; 14, Second bolt; 15, First support leg; 15-1, Central hole; 15-2, Guide groove; 15-3, Second through hole; 16, Second support leg; 16-1, Tip; 16-2, Second threaded hole. Detailed Implementation

[0021] To better understand the purpose, structure, and function of this invention, a portable folding outdoor sketching easel of this invention will be described in further detail below with reference to the accompanying drawings.

[0022] A portable folding outdoor sketching easel includes a drawing board fixing frame, a connecting rod, a third fixing frame 4, a rotating block 5, a bracket 10, a base 11, and supporting legs; The connecting rod includes a first connecting rod 3 and a second connecting rod 8. The first connecting rod 3 and the second connecting rod 8 have the same structure and are U-shaped long strips in the whole. The first connecting rod 3 and the second connecting rod 8 are provided with a first connecting hole 3-6 in the middle. The drawing board fixing frame includes a first drawing board fixing frame 1 and a second drawing board fixing frame 9. The first drawing board fixing frame 1 and the second drawing board fixing frame 9 have the same structure and are U-shaped long strips in the whole. Both the first drawing board holder 1 and the second drawing board holder 9 are provided with storage slots 1-3; the first connecting rod 3 is hinged to the second connecting rod 8 through a connector. After the first connecting rod 3 and the second connecting rod 8 are connected, they can rotate 90 degrees. When unfolded, they present a cross X shape, which opens the first drawing board holder 1 and the second drawing board holder 9. When closed, they are rod-shaped and hidden in the storage slots 1-3 of the first drawing board holder 1 and the second drawing board holder 9; when the first drawing board holder 1 and the second drawing board holder 9 are folded, the boss 1-4 of the first drawing board holder 1 and the first groove 1-5 of the second drawing board holder 9 are engaged in an interlocking manner; the first groove 1-5 of the first drawing board holder 1 and the boss 1-4 of the second drawing board holder 9 are engaged in an interlocking manner. The third fixing frame 4 is generally in the shape of a long strip plate, with a cylindrical hinged column 4-3 with a perforated boss in the middle area. The two connecting rods are fixed by passing through the first connecting hole 3-6 on the first connecting rod 3 and the second connecting rod 8. The first connecting rod 3 and the second connecting rod 8 rotate around the hinged column 4-3. The first drawing board fixing frame 1 and the second drawing board fixing frame 9 slide along the length of the third fixing frame 4. The rotating block 5 is a block-shaped structure. The rotating block 5 is provided with a first threaded post 5-3. The first threaded post 5-3 passes through the through hole in the middle of the hinge post 4-3 and is used to fix the first connecting rod 3 and the second connecting rod 8 by means of a nut. The rotating block 5 is used to fix the position of the third fixing frame 4. The bracket 10 is connected to the rotating block 5; the bracket 10 is fixed on the base plate 11. The support leg is fixed to the base plate 11, and the support leg is the support structure of the easel.

[0023] The left vertical plate of the drawing board holder has a first guide groove 1-1 along its length, and a second guide groove 1-2 is distributed parallel above the first guide groove 1-1. The inner area between the two guide grooves has a storage groove 1-3 extending along the length of the vertical plate. The bottom horizontal plate has multiple protrusions 1-4 arranged at intervals along its length. Each protrusion 1-4 has a corresponding recessed first groove 1-5 on its side. The top horizontal plate is equipped with a fifth cylindrical slider 1-6, and the side of the fifth cylindrical slider 1-6 has a semi-circular notch 1-7. The right vertical plate has a third guide groove 1-8 along its length, and a fourth guide groove 1-9 is distributed parallel above it. A cover plate 2 is installed on the surface of the drawing board holder.

[0024] The left end of the connecting rod is provided with a first cylindrical slider 3-1, and a second cylindrical slider 3-2 is coaxially distributed below the first cylindrical slider 3-1; the right end is provided with a third cylindrical slider 3-3, and a fourth cylindrical slider 3-4 is coaxially distributed below the third cylindrical slider 3-3; a notch 3-5 is provided at the bend, and a first connecting hole 3-6 is provided on the side wall of the notch 3-5; the first connecting hole 3-6 of the first connecting rod 3 is hinged to the second connecting rod 8 through the connector 6, and the notch 3-5 serves as a clearance structure at the hinge; The first cylindrical slider 3-1 and the second cylindrical slider 3-2 of the first connecting rod 3 respectively cooperate with the third guide groove 1-8 and the fourth guide groove 1-9 of the first drawing board holder 1, and the third cylindrical slider 3-3 and the fourth cylindrical slider 3-4 cooperate with the third guide groove 1-8 and the fourth guide groove 1-9 of the second drawing board holder 9; the first cylindrical slider 3-1 and the second cylindrical slider 3-2 of the second connecting rod 8 respectively cooperate with the first guide groove 1-1 and the second guide groove 1-2 of the first drawing board holder 9, and the third cylindrical slider 3-3 and the fourth cylindrical slider 3-4 cooperate with the first guide groove 1-1 and the second guide groove 1-2 of the second drawing board holder.

[0025] The third fixing frame 4 has a first sliding groove 4-1 extending along the length direction on the left side, and a first through groove 4-2 with a notch at the end; a second sliding groove 4-5 parallel to the first sliding groove 4-1 and extending along the length direction on the right side, and a second through groove 4-4 with a notch at the end; and four evenly spaced circular grooves 4-6 on the back of the middle part, which cooperate with the rotating block 5 for installation and positioning of related components.

[0026] The column slider 1-6 of the first drawing board holder 1 cooperates with the first slide groove 4-1 in the third holder 4, and the column slider 1-6 of the second drawing board holder 9 cooperates with the second slide groove 4-5.

[0027] The rotating block 5 has a block structure with an arc-shaped surface on one side and a flat surface on the other side. It includes a side through hole 5-1 and a uniformly distributed hemispherical groove 5-2 on one side of the flat surface. The hemispherical groove 5-2 corresponds to the circular groove 4-6. A first threaded post 5-3 is provided in the middle position. The first threaded post 5-3 passes through the through hole in the middle of the hinge post 4-3 and fixes the first connecting rod 3 and the second connecting rod 8 with the nut. When the easel is unfolded, the third fixing frame 4 can rotate 90 degrees around the first threaded post 5-3 on the rotating block (5) so that the easel has two clamping forms: horizontal and vertical. The four uniformly distributed circular grooves 4-6 on the third fixing frame 4 correspond to the grooves 5-2 on the rotating block 5. Springs and balls are placed in the grooves 5-2. During the rotation of the third fixing frame (4), the balls are trapped in the circular grooves 4-6 to fix the position of the third fixing frame 4. The support 10 consists of a bottom cylinder and a U-shaped groove. The bottom cylinder has a threaded through hole 10-1 in the middle, and the U-shaped groove has a third groove 10-2 in the middle to provide space for the third fixed frame 4. The top two sides of the U-shaped groove have a first through hole 10-3 and a nut groove 10-4. The first through hole 10-3 cooperates with the side through hole 5-1 on the rotating block 5. The first bolt 7 passes through the two holes to connect the support 10 and the rotating block 5. The nut groove 10-4 holds a nut to cooperate with the first bolt 7 for fastening. By tightening the first bolt 7, the rotating block 5 is fixed and can rotate around the first bolt 7 to realize the tilt adjustment of the easel.

[0028] The substrate 11 has a block structure with a first connecting block 11-2 and a second connecting block 11-5 arranged in a circular array around its edge. The side wall of the first connecting block 11-2 is provided with a second connecting hole 11-1 with a circular through hole. The side of the second connecting block is provided with a first threaded hole 11-6. The second connecting hole 11-1 and the first threaded hole 11-6 are coaxial. A second groove 11-3 is provided between the first connecting block 11-2 and the second connecting block 11-5. A stud 11-4 is provided in the central area of ​​the substrate 11. The bracket 10 is fixed to the substrate 11 through the threaded through hole 10-1 and the stud 11-4.

[0029] The support legs include a first support leg 15 and a second support leg 16. The first support leg 15 is an elongated hollow rectangular rod structure. The lower end of the first support leg 15 has a central hole 15-1 extending along the length of the rod to accommodate the second support leg 16. The front of the first support leg 15 has a guide groove 15-2 extending along its length, used to adjust the position of the second support leg 16 in conjunction with a second bolt 14. The upper end of the first support leg 15 has a circular second through hole 15-3 for inserting a wing bolt 13 to achieve connection with the base. Fixing plate 11; the second support leg 16 is a hollow elongated structure with a pointed tip 16-1 at the bottom, which is sharp and easy to insert into the ground or other support surfaces; the top of the second support leg 16 is provided with a second threaded hole 16-2, which is used to cooperate with the second bolt 14 to fix it to the first support leg 15; the second support leg 16 is placed in the middle hole 15-1 of the first support leg 15, and the second bolt 14 is placed in the guide groove 15-2 and cooperates with the second threaded hole 16-2. By tightening the second bolt 14, the second support leg 16 can be fixed to the first support leg 15.

[0030] The wing bolt 13 is shaped like a butterfly wing, making it easy to tighten manually. The cylindrical head 13-1 is located on the top of the wing bolt 13. The second threaded post 13-2 is located below the cylindrical head 13-1, extending vertically and having external threads on its surface. The pin 12 is located to the left of the second connecting hole 11-1 and the second through hole 15-3. The second threaded post 13-2 of the wing bolt 13 is located in the first threaded hole 11-6, and the cylindrical head 13-1 is located to the right of the second through hole 15-3. The diameter of the first threaded hole 11-6 is larger than the diameter of the second through hole 15-3. The first support leg 15 is fixed in the groove 11-2 by tightening the wing bolt 13.

[0031] There are three sets of supporting legs, evenly distributed around the circumference.

[0032] In the unfolded state of the easel, the third fixing frame 4 can rotate 90 degrees around the first threaded post 5-3 on the rotating block 5, so that the easel has two clamping forms: horizontal and vertical. The four evenly distributed circular grooves 4-6 of the third fixing frame 4 correspond to the grooves 5-2 on the rotating block 5. Springs and balls are placed in the grooves 5-2. During the rotation of the third fixing frame (4), the balls are trapped in the circular grooves 4-6, which fixes the position of the third fixing frame 4. The first drawing board holder 1, the second drawing board holder 9, the first connecting rod 3, and the second connecting rod 8 can rotate 90 degrees around the center hole of the hinge post 4-3 when folded. When folded, the first drawing board holder 1 and the second drawing board holder 9 rotate around the hinge post 4-3 and are parallel to the third holder 4. After rotating 90 degrees clockwise, the first drawing board holder 1 and the second drawing board holder 9 in the folded state are perpendicular to the third holder 4. At this time, the two drawing board holders can be unfolded. When the drawing board holders are unfolded, the first drawing board holder 1, the second drawing board holder 9, and the third holder 4 are connected as one unit.

[0033] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A portable folding outdoor sketching easel, characterized in that, Includes a drawing board holder, connecting rod, third holder (4), rotating block (5), bracket (10), base (11), and support leg; The connecting rod includes a first connecting rod (3) and a second connecting rod (8). The first connecting rod (3) and the second connecting rod (8) have the same structure and are U-shaped long strips. The first connecting rod (3) and the second connecting rod (8) are provided with a first connecting hole (3-6) in the middle. The drawing board fixing frame includes a first drawing board fixing frame (1) and a second drawing board fixing frame (9). The first drawing board fixing frame (1) and the second drawing board fixing frame (9) have the same structure and are U-shaped long strips. Both the first drawing board holder (1) and the second drawing board holder (9) are provided with storage slots (1-3); the first connecting rod (3) is hinged to the second connecting rod (8) through a connector. After the first connecting rod (3) and the second connecting rod (8) are connected, they can rotate 90 degrees. When unfolded, they present a cross X shape, which opens the first drawing board holder (1) and the second drawing board holder (9) and closes into a rod shape and is hidden in the storage slots (1-3) of the first drawing board holder (1) and the second drawing board holder (9); when the first drawing board holder (1) and the second drawing board holder (9) are folded, the boss (1-4) of the first drawing board holder (1) and the first groove (1-5) of the second drawing board holder (9) are engaged in an interlocking manner; the first groove (1-5) of the first drawing board holder (1) and the boss (1-4) of the second drawing board holder (9) are engaged in an interlocking manner. The third fixing frame (4) is generally in the shape of a long strip plate. A cylindrical hinged column (4-3) with a perforated boss is provided in the middle area. The two connecting rods are fixed by passing through the first connecting holes (3-6) on the first connecting rod (3) and the second connecting rod (8). The first connecting rod (3) and the second connecting rod (8) rotate around the hinged column (4-3). The first drawing board fixing frame (1) and the second drawing board fixing frame (9) slide along the length direction of the third fixing frame (4). The rotating block (5) has a block structure and is provided with a first threaded post (5-3). The first threaded post (5-3) passes through the through hole in the middle of the hinge post (4-3) and is used to fix the first connecting rod (3) and the second connecting rod (8) by means of a nut. The rotating block (5) is used to fix the position of the third fixing frame (4). The bracket (10) is connected to the rotating block (5); the bracket (10) is fixed on the base plate (11); The support leg is fixed to the base plate (11), and the support leg is the support structure of the easel.

2. The portable folding outdoor sketching easel according to claim 1, characterized in that, The left vertical plate of the drawing board holder has a first guide groove (1-1) along the length direction, and a second guide groove (1-2) is distributed parallel above the first guide groove (1-1). The inner area between the two guide grooves has a storage groove (1-3) extending along the length direction of the vertical plate. The bottom horizontal plate has multiple protrusions (1-4) arranged at intervals along the length direction. Each protrusion (1-4) has a corresponding recessed first groove (1-5) on its side. The top horizontal plate is equipped with a fifth cylindrical slider (1-6), and the side of the fifth cylindrical slider (1-6) has a semi-circular notch (1-7). The right vertical plate has a third guide groove (1-8) along the length direction, and a fourth guide groove (1-9) is distributed parallel above it. The surface of the drawing board holder is equipped with a cover plate (2).

3. A portable folding outdoor sketching easel according to claim 2, characterized in that, The left end of the connecting rod is provided with a first cylindrical slider (3-1), and a second cylindrical slider (3-2) is coaxially distributed below the first cylindrical slider (3-1); the right end is provided with a third cylindrical slider (3-3), and a fourth cylindrical slider (3-4) is coaxially distributed below the third cylindrical slider (3-3); a notch (3-5) is provided at the bend, and a first connecting hole (3-6) is provided on the side wall of the notch (3-5); the first connecting hole (3-6) of the first connecting rod (3) is hinged to the second connecting rod (8) through the connector (6), and the notch (3-5) serves as a clearance structure at the hinge; The first cylindrical slider (3-1) and the second cylindrical slider (3-2) of the first connecting rod (3) are respectively engaged with the third guide groove (1-8) and the fourth guide groove (1-9) of the first drawing board holder (1), and the third cylindrical slider (3-3) and the fourth cylindrical slider (3-4) are engaged with the third guide groove (1-8) and the fourth guide groove (1-9) of the second drawing board holder (9); the first cylindrical slider (3-1) and the second cylindrical slider (3-2) of the second connecting rod (8) are respectively engaged with the first guide groove (1-1) and the second guide groove (1-2) of the first drawing board holder (9), and the third cylindrical slider (3-3) and the fourth cylindrical slider (3-4) are engaged with the first guide groove (1-1) and the second guide groove (1-2) of the second drawing board holder.

4. A portable folding outdoor sketching easel according to claim 3, characterized in that, The third fixing frame (4) has a first sliding groove (4-1) extending along the length direction on the left side, and a first through groove (4-2) with a notch at the end; a second sliding groove (4-5) parallel to the first sliding groove (4-1) and extending along the length direction on the right side, and a second through groove (4-4) with a notch at the end; and four evenly spaced circular grooves (4-6) on the back of the middle part, which cooperate with the rotating block (5). The column slider (1-6) of the first drawing board holder (1) cooperates with the first slide groove (4-1) in the third holder (4), and the column slider (1-6) of the second drawing board holder (9) cooperates with the second slide groove (4-5).

5. A portable folding outdoor sketching easel according to claim 4, characterized in that, The rotating block (5) has a block structure with an arc-shaped curved surface on one side and a flat surface on the other side. It includes a side through hole (5-1) and a uniformly distributed hemispherical groove (5-2) on one side of the flat surface. The hemispherical groove (5-2) corresponds to the circular groove (4-6). A first threaded post (5-3) is provided in the middle position. The first threaded post (5-3) passes through the through hole in the middle of the hinge post (4-3) and fixes the first connecting rod (3) and the second connecting rod (8) by means of a nut. A spring and a ball are placed in the groove (5-2). The ball is embedded in the circular groove (4-6) to fix the position of the third fixing frame (4).

6. A portable folding outdoor sketching easel according to claim 5, characterized in that, The bracket (10) consists of a bottom cylinder and a U-shaped groove. The bottom cylinder has a threaded through hole (10-1) in the middle. The U-shaped groove has a third groove (10-2) in the middle to provide space for the third fixed frame (4). The top two sides of the U-shaped groove have a first through hole (10-3) and a nut groove (10-4). The first through hole (10-3) cooperates with the side through hole (5-1) on the rotating block (5). The first bolt (7) passes through the two holes to connect the bracket (10) and the rotating block (5). The nut groove (10-4) holds the nut and cooperates with the first bolt (7) to tighten it. By tightening the first bolt (7), the rotating block (5) is fixed. The rotating block (5) can rotate around the first bolt (7) to realize the tilt adjustment of the easel.

7. A portable folding outdoor sketching easel according to claim 6, characterized in that, The substrate (11) is a block structure with a first connecting block (11-2) and a second connecting block (11-5) arranged in a circular array around its edge. The side wall of the first connecting block (11-2) is provided with a second connecting hole (11-1) with a circular through hole. The side of the second connecting block is provided with a first threaded hole (11-6). The second connecting hole (11-1) is coaxial with the first threaded hole (11-6). A second groove (11-3) is provided between the first connecting block (11-2) and the second connecting block (11-5). A stud (11-4) is provided in the central area of ​​the substrate (11). The bracket (10) is fixed on the substrate (11) through the threaded through hole (10-1) and the stud (11-4).

8. A portable folding outdoor sketching easel according to claim 7, characterized in that, The support legs include a first support leg (15) and a second support leg (16). The first support leg (15) is a long, hollow rectangular rod structure. The lower end of the first support leg (15) has a central hole (15-1) that extends along the length of the rod to accommodate the second support leg (16). The front of the first support leg (15) has a guide groove (15-2) that runs through the length of the rod to adjust the position of the second support leg (16) with the help of bolts (14). The upper end of the first support leg (15) has a circular second through hole (15-3) for inserting a wing bolt (13) to achieve connection with the base. Fixing the plate (11); the second support leg (16) is a hollow strip structure with a pointed tip (16-1) at the bottom, which is sharp and easy to insert into the ground or other support surfaces; the top of the second support leg (16) is provided with a second threaded hole (16-2), which is used to cooperate with the second bolt (14) to fix it to the first support leg (15); the second support leg (16) is placed in the middle hole (15-1) of the first support leg (15), and the second bolt (14) is placed in the guide groove (15-2) and cooperates with the second threaded hole (16-2). By tightening the bolt, the second support leg (16) can be fixed to the first support leg (15).

9. A portable folding outdoor sketching easel according to claim 8, characterized in that, The butterfly bolt (13) is shaped like a butterfly wing; the cylindrical head (13-1) is located on the top of the butterfly bolt (13); the second threaded post (13-2) is located below the cylindrical head (13-1), extends vertically and has external threads on its surface; the pin (12) is located to the left of the second connecting hole (11-1) and the second through hole (15-3), the second threaded post (13-2) of the butterfly bolt (13) is located in the first threaded hole (11-6), the cylindrical head (13-1) is located to the right of the second through hole (15-3), the diameter of the first threaded hole (11-6) is larger than the diameter of the second through hole (15-3), and the first support leg (15) is fixed in the groove (11-2) by tightening the butterfly bolt (13).

10. A portable folding outdoor sketching easel according to claim 1, characterized in that, There are three sets of supporting legs, evenly distributed around the circumference.

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