A protective support for tightening a canvas

Abstract

The utility model relates to an oil painting equipment field especially relates to a kind of for oil painting canvas tight protection support. Including support frame and slide bar, slide bar is connected with sliding block, sliding block is slidably connected with support frame, four roots slide bars are respectively provided with through slot, through slot side wall is slidably connected with support rod, support rod is threadedly connected with limit block and clamping plate two, support rod is connected with clamping plate one, limit block and slide bar are mutually matched, clamping plate two and clamping plate one are mutually matched, support rod is connected with handle, sliding block is connected with connecting frame, support frame is provided with sliding slot, connecting frame is slidably connected with sliding slot, sliding block is rotatably connected with pivot, pivot is connected with pawl, pawl is connected with spring, the other end of spring is connected with connecting frame, sliding slot side wall is connected with tooth plate, pawl and tooth plate are mutually matched. Adopt the utility model can realize the flexible adjustment of support size, adapt multiple specifications oil painting canvas creation demand.

Description

Technical Field

[0001] This utility model relates to the field of oil painting equipment, and in particular to a support for tensioning and protecting oil painting canvas. Background Technology

[0002] In the field of oil painting, the canvas, as the core carrier of pigments and artistic expression, is directly related to the smoothness of the creative process, the final presentation effect of the painting, and its long-term preservation quality. As a key auxiliary tool, the canvas support has always been developed around the direction of "adapting to creative needs and ensuring canvas performance".

[0003] Traditional fixed inner frame stands have a fixed inner frame size and can only fit a single size canvas. When facing different needs from small sketching canvases to large creative canvases, the entire stand needs to be replaced, which is costly and inconvenient to store. Utility Model Content

[0004] The present invention aims to provide a support for tensioning and protecting oil painting canvases, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A protective bracket for tensioning oil painting canvas includes a support frame and sliding rods. Each sliding rod is connected to a slider, which is slidably connected to the support frame. Four sliding rods are provided, each with a through groove. Support rods are slidably connected to the sidewalls of the through grooves. Each support rod is threadedly connected to a limit block and a second clamping plate. A first clamping plate is connected to each support rod. The limit block cooperates with the sliding rod, and the second clamping plate cooperates with the first clamping plate. A handle is connected to each support rod. A connecting frame is connected to each slider. The support frame has a sliding groove, and the connecting frame is slidably connected to the sliding groove. A rotating shaft is rotatably connected to each slider. A pawl is connected to the rotating shaft, and a spring is connected to the pawl. The other end of the spring is connected to the connecting frame. A toothed plate is connected to the sidewall of the sliding groove, and the pawl cooperates with the toothed plate.

[0006] Preferably, the slider is rotatably connected to a roller, the support frame has a groove, the sidewall of the groove is connected to an optical shaft, and the roller is rotatably connected to the optical shaft.

[0007] Preferably, the first clamp and the second clamp are each connected to a rubber pad.

[0008] Preferably, the clamp is connected to an anti-slip pad, and the anti-slip pad cooperates with the slide rod.

[0009] Preferably, the support frame is connected to a mounting plate.

[0010] Preferably, the rotating shaft is connected to a lever.

[0011] The beneficial effects of this technical solution compared to existing technologies are as follows: (1) This solution achieves flexible adjustment of the support frame size by setting up structures such as sliding rods, through grooves, and support rods, adapting to the needs of creating oil canvases of various sizes. Sliding the sliders along the support frame can adjust the horizontal and vertical distances between the sliding rods, and sliding the support rods along the through grooves can adapt to canvas edges of different widths. The two together can achieve full coverage from small sketching canvases to large-scale creative canvases. This multi-dimensional adjustment structure does not require replacing the main support frame; size adaptation can be completed simply by sliding the components, which reduces equipment costs and storage space, making it especially suitable for studios, classrooms, and other scenarios where canvas sizes need to be frequently changed. (2) By setting up rollers, grooves, and optical axes, the smoothness and stability of slider adjustment are significantly improved. The rollers and optical axes generate rolling friction, which greatly reduces frictional resistance, making it easier to push the slider to move the slider. Even a single person can easily complete the tension adjustment of multiple canvas sizes. At the same time, the guiding effect of the optical axis on the rollers can limit the sliding direction of the slider, preventing the slider from deviating during the adjustment process and causing the slider to tilt. This ensures that the canvas is always in a regular support state, providing a stable foundation for the subsequent uniform tensioning of the canvas.

[0012] (3) By incorporating rubber pads, the protection and fixation of the canvas edges are enhanced. Furthermore, the rubber pads possess elasticity and friction, allowing them to conform to the canvas edges through elastic deformation during clamping, preventing damage to the fibers from hard contact. Simultaneously, they increase the friction between the clamps and the canvas, preventing slippage at the edges during tensioning or creation, ensuring a secure fixation. In addition, the softness of the rubber pads adapts to canvas edges of varying thicknesses, enabling stable clamping even on thicker canvases with linings, thus improving the bracket's adaptability to various canvas types.

[0013] (4) By setting anti-slip pads, the connection stability between the support rod and the slide rod is further enhanced, and the support rod is prevented from shifting when the canvas is tightened. As a key component connecting adjacent slide rods, the relative position of the support rod and the slide rod directly affects the uniformity of canvas tightening. In the traditional structure, the support rod is prone to sliding along the slide rod groove due to the rebound force of the canvas, resulting in local tension imbalance. The anti-slip pads can increase the friction between the clamp and the slide rod. Combined with the positioning effect of the limiting block, the position of the support rod on the slide rod can be firmly fixed, preventing it from shifting longitudinally or laterally during the canvas tightening process.

[0014] (5) By setting up a mounting plate, the usage scenarios and fixing methods of the bracket can be expanded. For example, it can be fixed to the easel crossbar for standing creation, or installed on the edge of the workbench to save operating space, or even fixed to an outdoor sketching easel to meet the needs of outdoor creation. In addition, it makes the connection between the bracket and the external carrier more secure, avoiding canvas displacement caused by the bracket shaking during creation. Especially when using techniques that require a lot of force, such as using a scraper or thick paint, a stable mounting base can ensure accurate brush operation and improve the creative experience.

[0015] (6) By setting a lever, the unlocking operation of the pawl and the toothed plate is simplified, and the convenience of bracket adjustment is improved. Traditional pawl unlocking often requires directly moving the pawl body, which has a small operating space and is prone to deformation due to improper force; while the lever extends to the outside of the slider, and during operation, you only need to move the lever with your finger to drive the pawl to disengage from the toothed plate through the rotating shaft, and no additional tools are required for the unlocking process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 A front sectional view of the sliding groove provided by this utility model; Figure 3 A left sectional view of the roller groove provided by this utility model; Reference numerals in the attached drawings: 1. Support frame; 2. Slide bar; 3. Through groove; 4. Mounting plate; 5. Slider; 6. Rotating shaft; 7. Toggle block; 8. Sliding groove; 9. Clamping plate one; 10. Clamping plate two; 11. Handle; 12. Toothed plate; 13. Connecting frame; 14. Pawl; 15. Spring; 16. Limiting block; 17. Anti-slip pad; 18. Rubber pad; 19. Support rod; 20. Optical shaft; 21. Roller groove; 22. Roller. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: like Figure 1-3The illustrated support for tensioning and protecting oil painting canvas includes a support frame 1 and four sliding rods 2. The four sliding rods 2 are divided into two groups: one group is arranged horizontally in parallel, and the other group is arranged vertically in parallel. The two groups of sliding rods 2 are vertically intersecting and staggered. Each sliding rod 2 has a slider 5 connected to both ends. Each slider 5 is slidably connected to the outer wall of the support frame 1. Each of the four sliding rods 2 has a through groove 3. The side wall of the through groove 3 at each staggered position is slidably connected to a support rod 19 for fixing the edges and corners of the canvas. At the same time, support rods 19 are also slidably connected at the non-intersecting points between the two sliding rods 2 in the horizontal group and between the two sliding rods 2 in the vertical group to help fix the middle area of ​​the canvas edge, ensuring that the canvas edge is evenly taut from the corners to the center. This is suitable for techniques that require high canvas support strength, such as thick painting and palette knife painting. Each support rod 19 is threadedly connected to a limiting block 16 and a clamping plate 10. Rotating the limiting block 16 disengages it from the support rod 19, allowing the support rod 19 and its connected components to be disassembled. Each support rod 19 is connected to a clamping plate 9. The limiting block 16 cooperates with the slide rod 2, and each clamping plate 10 cooperates with its corresponding clamping plate 9. Rotating the clamping plate 10 adjusts its distance from the clamping plate 9, adapting to canvases of different thicknesses. All the clamps 19 on the support rods 19 are on the same horizontal line. Each support rod 19 is connected to a handle 11 at the top. Each slider 5 is connected to a connecting frame 13. The outer walls of the support frame 1 are provided with sliding grooves 8. Each connecting frame 13 is slidably connected to the corresponding sliding groove 8. Pushing the slider 5 along the sliding groove 8 can drive the slider 2 to move horizontally or vertically, easily adapting to different sized canvases. Each slider 5 is rotatably connected to a pivot 6. Each pivot 6 is connected to a pawl 14. Each pawl 14 is connected to a spring 15. The other end of each spring 15 is connected to the corresponding connecting frame 13. Each sliding groove 8 is connected to a toothed plate 12 at the bottom wall. Each pawl 14 cooperates with the corresponding toothed plate 12. When slider 5 is pushed to tighten the canvas by moving slider 2, pawl 14 engages with toothed plate 12 under the elastic force of spring 15. Due to the toothed design of toothed plate 12, pawl 14 can slide unidirectionally along toothed plate 12 without obstructing slider 2 from moving in the tightening direction. After the canvas is adjusted to the target tension, slider 5 is released. Pawl 14, under the action of spring 15, engages with the toothed groove of toothed plate 12, preventing slider 5 from moving in the slack direction. This achieves stable locking of slider 2, ensuring that the canvas is in a constant tension state for a long time and preventing slack due to canvas rebound force.

[0018] like Figure 3As shown, each slider 5 has rollers 22 rotatably connected to its upper and lower ends. Two roller grooves 21 are formed on the outer walls of the support frame 1, and two optical axes 20 are connected to the side walls of each roller groove 21. Each roller 22 is rotatably connected to its corresponding optical axis 20. This converts the sliding friction between the slider 5 and the support frame 1 into rolling friction, significantly reducing adjustment resistance. Furthermore, the guiding effect of the optical axis 20 on the rollers 22 restricts the sliding direction of the slider 5, preventing the slider 2 from tilting during adjustment and ensuring the canvas remains in a regular rectangular support state.

[0019] like Figure 2 As shown, each clamp 19 and clamp 20 has a rubber pad 18 connected to its opposite side. The rubber pad 18 is elastic and non-slip, allowing it to conform to the canvas edge through elastic deformation when clamping the canvas, avoiding the compression and damage to the canvas fibers caused by traditional rigid clamps. Simultaneously, the rubber pad 18 increases the friction between the clamp and the canvas, preventing the canvas from slipping at the edges during tensioning or creation. Each clamp 19 has an anti-slip pad 17 connected to its bottom, and each anti-slip pad 17 cooperates with its corresponding slide rod 2. The anti-slip pad 17 adheres to the surface of the slide rod 2, increasing the friction between the clamp 19 and the slide rod 2, enhancing the stability of the support rod 19. At the same time, the softness of the anti-slip pad 17 reduces friction and wear between the clamp 19 and the slide rod 2, extending the service life of the support frame.

[0020] like Figure 1 As shown, mounting plates 4 are connected to both ends of the upper and lower sides of the support frame 1. Each pivot 6 is connected to a lever 7. If it is necessary to adjust the tension or remove the canvas, the lever 7 on the pivot 6 can be moved to rotate the pawl 14 around the pivot 6, so that the pawl 14 disengages from the toothed plate 12. After the lock is released, the slider 5 can be pushed to adjust the position of the slider 2.

[0021] The specific implementation process is as follows: In use, place the canvas edges sequentially between the clamps 1-9 and 2-10 of each support rod 19. First, fix the support rods 19 at the staggered positions, i.e., the corners of the canvas; then fix the support rods 19 at the non-staggered positions, i.e., the middle area of ​​the canvas edge. Rotate the clamps 2-10 on each support rod 19 to reduce the distance between them and the clamps 1-9 until the rubber pads 18 are in contact with the canvas edge, achieving a stable clamping of the canvas edge. Then, push the slider 5 along the tensioning direction, pushing the horizontal group slide rod 2 horizontally and the vertical group slide rod 2 vertically, causing the canvas to gradually tighten. During this process, the pawl 14 engages with the toothed plate 12 in one direction under the action of the spring 15, without hindering the movement of the slide rod 2. When the canvas reaches the target tension, release the slider 5. The pawl 14, under the action of the spring 15, engages with the toothed groove of the toothed plate 12, preventing the slider 5 from moving in the opposite direction and locking the position of the slide rod 2, ensuring that the canvas is in a constant tension state for a long time. To adjust the tension, move the lever 7 to disengage the pawl 14 from the toothed plate 12, push the slider 5 to fine-tune the position of the slide bar 2, and then release the lever 7 to relock it. When removing the canvas, first move the lever 7 to release the slide bar 2 from the lock, then rotate the clamp 2 10 to increase the gap and remove the canvas. If you need to remove the support rod 19, rotate the limit block 16 to disengage it from the support rod 19, and then grasp the handle 11 to remove the support rod 19 along the through groove 3.

[0022] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A tensioning and protective bracket for oil painting canvas, characterized in that: The system includes a support frame (1) and slide rods (2). Each slide rod (2) is connected to a slider (5), which is slidably connected to the support frame (1). There are four slide rods (2), each with a through groove (3). A support rod (19) is slidably connected to the side wall of each through groove (3). Each support rod (19) is threadedly connected to a limit block (16) and a second clamping plate (10). Each support rod (19) is connected to a first clamping plate (9). The limit block (16) cooperates with the slide rod (2), and the second clamping plate (10) cooperates with the first clamping plate (9). The support rod (19) is connected to a handle (11), the slider (5) is connected to a connecting frame (13), the support frame (1) has a sliding groove (8), the connecting frame (13) is slidably connected to the sliding groove (8), the slider (5) is rotatably connected to a rotating shaft (6), the rotating shaft (6) is connected to a pawl (14), the pawl (14) is connected to a spring (15), the other end of the spring (15) is connected to the connecting frame (13), the side wall of the sliding groove (8) is connected to a toothed plate (12), and the pawl (14) and the toothed plate (12) cooperate with each other.

2. The protective bracket for tensioning oil painting canvas as described in claim 1, characterized in that: The slider (5) is rotatably connected to a roller (22), the support frame (1) has a roller groove (21), the side wall of the roller groove (21) is connected to an optical shaft (20), and the roller (22) is rotatably connected to the optical shaft (20).

3. The protective bracket for tensioning oil painting canvas as described in claim 1, characterized in that: The first clamp (9) and the second clamp (10) are respectively connected to rubber pads (18).

4. The protective bracket for tensioning oil painting canvas as described in claim 1, characterized in that: The clamping plate (9) is connected to an anti-slip pad (17), which cooperates with the slide rod (2).

5. A protective bracket for tensioning oil painting canvas as described in claim 1, characterized in that: The support frame (1) is connected to the mounting plate (4).

6. A protective bracket for tensioning oil painting canvas as described in claim 1, characterized in that: The rotating shaft (6) is connected to a lever (7).

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