CN107713350B - Drawing board top clamping and fixing mechanism of easel - Google Patents

Abstract

The top clamping and fixing mechanism of the drawing board of the easel comprises a lower supporting plate arranged on supporting legs of the easel, a connecting pipe arranged on a fixing seat connected with the upper parts of the supporting legs, and a top clamping and fixing mechanism of the drawing board arranged on the connecting pipe.

Description

Clamping and fixing mechanism at the top of the drawing board of the easel

Technical field

The present invention relates to an easel, and in particular to a clamping and fixing mechanism at the top of the drawing board of the easel.

Background technique

An easel is a shelf used to place drawing boards when painting. Traditional easels are made of wood. Each wooden strip is fixed by nails to form an easel. It is generally used indoors. If you want to take it to the wild, the structure is large and inconvenient to carry. Therefore, people invented the telescopic easel. The support legs of the telescopic easel can be shortened and folded. After shrinking, the easel is compact and easy to carry. A clamping and fixing mechanism for the drawing board will be installed on the top of the telescopic easel. The existing clamping and fixing mechanism generally includes a vertical lifting rod. The lifting rod is driven up and down by a rocker. The upper end of the lifting rod is connected to a pressure plate. The pressure plate It is rotatably connected to the lifting rod through an eccentric shaft. A fixed plate and a sliding plate are set on the lifting rod under the pressure plate. A spring is set between the fixed plate and the sliding plate. The head of the sliding plate is equipped with a transverse splint. When the pressure plate is pressed down, it is in contact with the sliding plate. When people want to take out the drawing board from the easel, they need to first rotate the pressure plate on the head upward through the eccentric shaft. After the rotation, the pressure plate no longer presses and fixes the sliding plate under the action of the eccentric shaft, and then People push the sliding plate forward, and the sliding plate drives the horizontal splint forward to disengage from the drawing board. At this time, the pressure plate needs to be rotated downward through the eccentric shaft, and the sliding plate is pressed again. Finally, people can turn the lifting rod by rotating the rocker. When the drawing board is to be placed and clamped, people put the drawing board on the easel, then turn the rocker to lower the lifting rod, and the lifting rod drives the fixed plate, sliding plate and splint to descend until the The splint is pressed on the upper end of the drawing board. At this time, the pressing plate is rotated upward by hand, and the spring drives the sliding plate and the splint backward under the action of the restoring force. The splint clamps the drawing board. Finally, the pressing plate is pressed downward, and the pressing plate moves downward under the action of the eccentric shaft. Rotate and press the sliding plate so that the clamping plate remains clamped to the drawing board. The disadvantages of this structure are: 1. The operation of taking out and clamping the drawing board is very troublesome and cumbersome; 2. The structure of the clamping and fixing mechanism is complex, which increases the manufacturing cost; 3. The longitudinal fixed plate and sliding plate, as well as the horizontal The plywood appears abrupt and has poor integrity. Especially during transportation, the single-piece transverse plywood is easily broken and damaged, and its strength is poor, which affects its service life.

Contents of the invention

The object of the present invention is to overcome the shortcomings of the existing technology and provide a top clamping of the drawing board of an easel that is easy to take out and clamp, has a simple structure, low manufacturing cost, good integrity, high structural strength, and guaranteed service life. Fixed mechanism.

The technical solution of the drawing board top clamping and fixing mechanism of the easel of the present invention is: it includes a supporting foot of the easel, a lower supporting plate of the drawing board is arranged on the supporting foot, the upper part of the supporting foot is connected to a fixed base, a connecting pipe is provided on the fixed base, and the connecting pipe is A top clamping and fixing mechanism is provided for the drawing board, which is characterized in that: the top clamping and fixing mechanism includes a fixed box, a connecting cover and a splint, a connecting cover is set on the fixing box, a splint is set in the connecting cover, and the lower end of the fixing box There are inserting posts, which are plugged and matched with the connecting pipe. The upper end of the fixed box is equipped with left baffle, right baffle and rear baffle. The inner walls of the left and right baffles are equipped with pins and protrusions. The rear baffle is There is a positioning plate on the inner wall. The front side of the fixed box is an opening. There are positioning pieces and vertical plates on the opening on the front side. There are protruding limiting teeth on the limiting piece. The front side of the limiting teeth is a slope. The back side of the position tooth is a straight surface, and hooks are formed on both sides of the vertical plate. The lower end of the connecting cover is equipped with a connecting plate, a spring piece and an L-shaped limiting slide plate. The connecting plate, the spring piece and the L-shaped limiting plate are The skateboards are divided into two groups, the left and right groups, which are symmetrical to each other. There is an arc-shaped groove in the connecting plate. The pin of the fixed box is inserted into the arc-shaped groove. The pin cooperates with the connecting plate and the elastic piece. There is a directional groove on the inner wall of the limiting skateboard. The extension plate protrudes from the inside, and the extension plate matches the hook of the vertical plate. The outer wall of the limiting slide plate has a groove, and the groove matches the inner wall protrusions of the left and right baffles. The splint is made on one side. There is a slider, and there are two or more latching teeth made under the slider. The front side of the latching teeth is a straight blocking surface, and the back side of the latching teeth is an inclined guide surface. The straight blocking surface of the latching teeth is the straight surface of the limiting tooth. To match, the inclined guide surface of the clamping tooth matches the inclined surface of the limiting tooth, a perforation is opened in the slider, a spring is set between the slider and the back baffle of the fixed box, a guide rod is set in the spring, and one end of the guide rod There is a baffle ring, which matches the positioning plate of the rear baffle, and the other end of the guide rod is inserted into the through hole.

The invention discloses a clamping and fixing mechanism on the top of the drawing board of the easel. When people want to put the drawing board on the easel or take out the drawing board from the easel, they can push the connecting cover backward by 1-2 mm with their fingers to make the connection The extension plate on the inside of the L-shaped limit slide under the cover moves inward and detaches from the hook on the vertical plate of the fixed box. At this time, the connecting cover can be flipped upward through the arc groove around the pin of the fixed box, and the connecting cover drives the The splint is flipped upward to open, and people can open the connecting cover and the splint upward to a certain angle (usually 15°-40°), so that the groove on the outer wall of the connecting cover can protrude from the protrusions on the inner wall of the left and right baffles of the fixed box, and the The protrusion is stuck at the lower end of the connection cover, so that the connection cover and the splint will not fall after people release their hands. When the splint rotates upward and opens, the spring pushes the slider forward under the action of elastic force, and the integrated part on the slider The splint moves forward and upward (tilt upward). At this time, the drawing board can be placed on the easel, or the drawing board on the easel can be taken out. The splint will not block the drawing board; when the drawing board is placed and needs to be clamped and fixed, just Press the connection cover downward with your hand slightly, so that the connection cover can rotate downward against the resistance of the protrusion. Press the protrusions to slightly deform the left and right baffles, and the connecting cover can rotate downward). After the connecting cover rotates downward, it becomes horizontal with the fixed box. At the same time, the connecting cover drives the splint to rotate downward together to a horizontal state, making the sliding The clamping teeth at the lower end of the block mesh with the limiting teeth on the limiting piece. At this time, the spring slightly pushes the slider forward again. The slider drives the splint and the connecting cover to move forward 1-2 mm, making the L-shaped limit under the connecting cover The extension plate on the inside of the slide plate again cooperates with the hook on the vertical plate of the fixed box to prevent the connection cover from opening. At this time, the splint is pushed forward under the action of the spring, and people can push the splint backward. The integrated slide block overcomes the elastic force of the spring and moves backward (because the front side of the lower teeth of the slide block is a straight surface and the rear side is an inclined guide surface, and the front side of the upper limit teeth of the limit piece is a straight surface and the rear side is an inclined surface, Therefore, when the slider is pushed backward, the inclined guide surface cooperates with the inclined surface, and the slider can be pushed backward one by one. However, the straight surface of the limit tooth blocks the straight surface of the clamping tooth, and the slider cannot move forward. , so the slider and the splint at this time can only be pushed backward, but cannot move forward) until the splint clamps the upper end of the drawing board. The top clamping and fixing mechanism of the drawing board of the easel of this solution is, firstly, easy to operate when picking up and placing the drawing board; secondly, the structure is simple and the manufacturing cost is low; thirdly, the fixed box, connecting cover and splint are in the shape of a rectangular parallelepiped when not in use and shrink, and the integrity is Good, high structural strength to avoid collision damage during transportation and ensure service life.

The drawing board top of the easel of the present invention is a clamping and fixing mechanism. The front end of the limiting slide plate is provided with a barb, and a retractor is formed under the slider. The retractor matches the barb. With the hook and barb, the slider is limited to prevent the splint and slider from coming out. A chute is formed between the rear side of the left baffle and the right baffle and the rear baffle. The inclination angle of the chute is 15°-40°, and the chute is in contact with the lower end of the connecting cover. When the connection cover and the splint are opened upward, the rear side of the connection cover is in contact with the chute. The chute can limit the opening angle of the connection cover and the splint, preventing the opening angle from being too large and causing the arc of the connection plate to The groove protrudes from the pin on the inner wall of the fixed box. The outer wall of the insertion post is evenly distributed with convex arcs and concave arcs, and the convex arcs and concave arcs are spaced apart from each other. There is a insertion surface inclined inward under the convex arc, and the convex arc and the insertion surface are connected with each other. Match the inner wall of the connecting pipe. The outer diameter of the convex arc on the outer wall of the inserting post is slightly larger than the inner diameter of the inner wall of the connecting pipe. When the inserting post is inserted into the connecting pipe, it is first matched with it through the inclined insertion surface, which is easy to insert. After insertion, it is inserted through the convex circle with a slightly larger outer diameter. The arc is extruded on the inner wall of the connecting pipe, making the plug-in fit between the two tight and reliable. There is a reinforcing piece between the insertion post and the fixed box. With the reinforcement sheet, the structural strength between the insertion post and the fixed box is improved.

Description of drawings

Figure 1 is a three-dimensional schematic diagram of a clamping and fixing mechanism on the top of the drawing board installed on the easel;

Figure 2 is a three-dimensional schematic view of the clamping and fixing mechanism at the top of the drawing board;

Figure 3 is a schematic structural diagram of the clamping and fixing mechanism at the top of the drawing board;

Figure 4 is an exploded perspective view of the clamping and fixing mechanism at the top of the drawing board;

Figure 5 is an exploded structural diagram of the clamping and fixing mechanism at the top of the drawing board;

Figure 6 is a perspective view of the connection cover;

Figure 7 is a schematic structural diagram of the plug-in connection state between the connecting pipe and the fixed box.

Detailed ways

The invention relates to a clamping and fixing mechanism for the top of the drawing board of an easel, as shown in Figures 1 to 7, which includes a support leg 1 of the easel, a lower supporting plate 11 of the drawing board is provided on the support leg, and the upper part of the support leg is connected to a fixed seat 12 , a connecting pipe 13 is set on the fixed base, and a top clamping and fixing mechanism 14 of the drawing board is set on the connecting pipe. It is characterized in that: the top clamping and fixing mechanism 14 includes a fixing box 2, a connecting cover 4 and a splint 6. In the fixing box A connecting cover is provided on the top, and a splint is provided in the connecting cover. The lower end of the fixed box 2 is provided with an inserting post 20, which is plugged and matched with the connecting pipe 13. The upper end of the fixed box is provided with a left baffle 21, a right baffle 22 and a rear The baffle 23 has pins 24 and protrusions 25 on the inner walls of the left and right baffles, a positioning plate 26 on the inner wall of the rear baffle, an opening on the front side of the fixed box, and a positioning piece on the front opening. 27 and vertical plate 28, the limiting piece is formed with protruding limiting teeth 29, the front side of the limiting teeth is a bevel 30, the rear side of the limiting teeth is a straight surface 31, and both sides of the vertical plate are formed with hooks 32. The lower end of the connecting cover 4 is provided with a connecting plate 41, a spring piece 42 and an L-shaped limiting slide plate 43. The connecting plate, the elastic piece and the L-shaped limiting sliding plate are two groups on the left and right, and are symmetrical to each other. In the connecting plate, An arc-shaped groove 44 is formed, and the pin 24 of the fixed box 2 is inserted into the arc-shaped groove. The pin cooperates with the connecting plate and the elastic piece. An inwardly protruding extension plate 45 is formed on the inner wall of the limiting slide plate 43. The extension plate Cooperating with the hooks 32 of the vertical plate 28, the outer wall of the limiting slide plate is formed with a groove 46, which is coupled with the inner wall protrusions 25 of the left and right baffles 21 and 22. The splint 6 is formed with a groove on one side. The slider 61 has two or more latching teeth 63 formed under the slider. The front side of the latching teeth is a straight blocking surface 64, and the rear side of the latching teeth is an inclined guide surface 65. The straight blocking surface and the limiting surface of the latching teeth are The straight surface 31 of the tooth 29 matches, the inclined guide surface of the latch tooth matches the inclined surface 30 of the limiting tooth, a through hole 66 is opened in the slider 61, and a spring 67 is provided between the slider and the back baffle 23 of the fixed box 2 , a guide rod 68 is provided in the spring, one end of the guide rod is equipped with a blocking ring 69, the blocking ring matches the positioning plate 26 of the rear baffle 23, and the other end of the guide rod is inserted into the through hole 66. When people want to put the drawing board on the easel or take out the drawing board from the easel, they can use their fingers to push the connecting cover backward by a distance of 1-2 mm, so that the extension plate 45 on the inside of the L-shaped limiting slide 43 under the connecting cover 4 moves toward The inner movement and the hook 32 on the vertical plate 28 of the fixed box 2 are separated from each other. At this time, the connecting cover 4 can be flipped upward through the arc groove 44 around the pin 24 of the fixed box 2. The connecting cover 4 drives the splint 6 to be flipped upward. To open, people can open the connecting cover and the splint upward to a certain angle (usually 15°-40°), so that the groove 46 on the outer wall of the connecting cover 4 can protrude from the protrusions on the inner walls of the left and right baffles 21 and 22 of the fixed box 2 25, and the protrusion is stuck at the lower end of the connecting cover 4, so that the connecting cover and the splint 6 will not fall after people release their hands, and when the splint is rotated upward and opened, the spring 67 will push the slide forward under the action of elastic force. Block 61, the integrated splint 6 on the slider moves forward and upward (tilt upward). At this time, the drawing board can be placed on the easel, or the drawing board on the easel can be taken out. The splint 6 will not block the drawing board; when the drawing board is placed, When clamping and fixing it, just press the connecting cover 4 downwards with a little force, so that the connecting cover can rotate downward against the resistance of the protrusion 25 (make the protrusion into a protruding arc shape, and press it with a little force to When the connection cover is pressed down, the side wall of the connection cover squeezes the protrusions, causing the left and right baffles 21 and 22 to deform slightly, and the connection cover 4 can rotate downward). After the connection cover rotates downward, it becomes horizontal with the fixed box 2 state, and at the same time, the connecting cover drives the splint 6 to rotate downward together to a horizontal state, so that the teeth 63 at the lower end of the slider 61 mesh with the limit teeth 29 on the limiter 27. At this time, the spring 67 slightly pushes the slider forward again. 61. The slider drives the splint 6 and the connecting cover 4 to move forward 1-2 mm together, so that the extension plate 45 on the inside of the L-shaped limit slide 43 under the connecting cover is again matched with the hook 32 on the vertical plate 28 of the fixed box 2 , thereby preventing the connection cover 4 from opening, and at this time, the splint 6 is in a forward pushing state under the action of the spring 67. People can push the splint backward, and the integrated slider 61 on the splint overcomes the elastic force of the spring 67 and moves backward (due to The front side of the lower latch tooth 63 of the slider is a straight surface 64 and the rear side is an inclined guide surface 65. The front side of the upper limit tooth 29 of the limiting piece 27 is a straight surface 31 and the rear side is an inclined surface 30. Therefore, when the slider 61 When pushing backward, the inclined guide surface 65 cooperates with the inclined surface 30, and the slider can be pushed backward one by one. However, the straight surface 31 of the limiting tooth 29 blocks the straight blocking surface 64 of the latch tooth 63, and the slider 61 cannot move forward. Move forward, so the slider and the splint 6 at this time can only be pushed backward, but cannot move forward) until the splint clamps the upper end of the drawing board. The top clamping and fixing mechanism of the drawing board of the easel of this solution is, firstly, easy to operate when picking up and placing the drawing board; secondly, the structure is simple and the manufacturing cost is low; thirdly, the fixed box 2, the connecting cover 4 and the splint 6 are in the shape of a rectangular parallelepiped when not in use. , good integrity and high structural strength to avoid collision damage during transportation and ensure service life. A barb 47 is formed on the front end of the limiting slide plate 43, and a draw hook 62 is formed under the slider 61, and the draw hook cooperates with the barb. With the hook 62 and the barb 47, the slider 61 is limited to prevent the splint 6 and the slider from coming out. A chute 37 is formed between the rear side of the left baffle 21 and the right baffle 22 and the rear baffle 23. The inclination angle of the chute is 15°-40°, and the chute is in contact with the lower end of the connecting cover 4. When the connection cover 4 and the splint 6 are opened upward, the rear side of the connection cover is in contact with the chute 37. The chute can limit the opening angle of the connection cover 4 and the splint 6 to prevent the opening angle from being too large. The arc-shaped groove 44 of the connecting plate is disengaged from the pin 24 on the inner wall of the fixed box 2 . The outer wall of the insertion post 20 is evenly distributed with convex arcs 33 and concave arcs 34. The convex arcs and concave arcs are spaced apart from each other. An inwardly inclined insertion surface 35 is formed under the convex arc. The convex arcs and The insertion surface matches the inner wall of the connecting pipe. The outer diameter of the convex arc 33 on the outer wall of the plug 20 is slightly larger than the inner diameter of the inner wall of the connecting pipe 13. When the plug is inserted into the connecting pipe, it is first matched with the inclined plug surface 35. The insertion is easy. After the insertion, the outer diameter is slightly larger. The large convex arc 33 is pressed against the inner wall of the connecting pipe 13, so that the plug-in fit between the two is tight and reliable. A reinforcing piece 38 is formed between the insertion post 20 and the fixed box 2 . With the reinforcing piece 38, the structural strength between the insertion post 20 and the fixed box 2 is improved.

Claims (4)

1. The top clamping and fixing mechanism of the drawing board of the easel includes the supporting feet of the easel (1), the lower supporting plate of the drawing board (11) is set on the supporting feet, the upper part of the supporting feet is connected to the fixed base (12), and the fixed base is provided with a connection Pipe (13), a top clamping and fixing mechanism (14) of the drawing board is provided on the connecting pipe, which is characterized in that: the top clamping and fixing mechanism (14) includes a fixed box (2), a connecting cover (4) and a splint ( 6), a connection cover is provided on the fixed box, and a splint is provided in the connection cover. The lower end of the fixed box (2) is equipped with an inserting post (20), and the inserting post is plugged and matched with the connecting pipe (13). The upper end of the fixing box is made There are left baffle (21), right baffle (22) and rear baffle (23). The inner walls of the left and right baffles are equipped with pins (24) and protrusions (25). The inner wall of the rear baffle is equipped with Positioning plate (26), the front side of the fixed box is an opening, a positioning piece (27) and a vertical plate (28) are formed on the front opening, and a protruding limiting tooth (29) is formed on the limiting piece. The front side of the positioning tooth is a bevel (30), the rear side of the limiting tooth is a straight surface (31), hooks (32) are formed on both sides of the vertical plate, and a connecting plate (32) is formed on the lower end of the connecting cover (4). 41), elastic pieces (42) and L-shaped limiting slide plates (43). The connecting plate, elastic pieces and L-shaped limiting sliding plates are divided into two groups on the left and right, and are symmetrical to each other. An arc-shaped groove is formed in the connecting plate ( 44), the pin (24) of the fixed box (2) snaps into the arc groove, and the pin matches the connecting plate and the elastic piece. An extension plate (45) protruding inward is formed on the inner wall of the limiting slide plate (43). ; 25) to match, a slider (61) is formed on one side of the splint (6), and two or more latching teeth (63) are formed under the slider, and the front side of the latching teeth is a straight blocking surface (64). ), the rear side of the latch is an inclined guide surface (65), the straight surface of the latch matches the straight surface (31) of the limit tooth (29), the oblique guide surface of the latch matches the inclined surface of the limit tooth (30) ) to match, a perforation (66) is opened in the slider (61), a spring (67) is set between the slider and the back baffle (23) of the fixed box (2), and a guide rod (68) is set in the spring. One end of the guide rod is equipped with a blocking ring (69). The blocking ring matches the positioning plate (26) of the rear baffle (23). The other end of the guide rod is inserted into the through hole (66). The left baffle (21) A chute (37) is formed between the rear side of the right baffle (22) and the rear baffle (23). The inclination angle of the chute is 15°-40°. The chute is in contact with the lower end of the connecting cover (4). . 2. The top clamping and fixing mechanism of the drawing board of the easel according to claim 1, characterized in that: a barb (47) is formed on the front end of the limiting slide (43), and a barb (47) is formed under the slider (61). Retractor hook (62), the retractor hook cooperates with the barb. 3. The clamping and fixing mechanism at the top of the drawing board of the easel according to claim 1, characterized in that: the outer wall of the insertion post (20) is evenly distributed with convex arcs (33) and concave arcs (34). The convex arcs The concave arcs and concave arcs are spaced apart from each other, and an inwardly inclined insertion surface (35) is formed under the convex arc. The convex arc and the insertion surface match the inner wall of the connecting pipe (13). 4. The top clamping and fixing mechanism of the drawing board of the easel according to claim 1, characterized in that: a reinforcing piece (38) is formed between the insertion post (20) and the fixing box (2).