Multifunctional sliding table saw for woodworking

Abstract

A multifunctional woodworking table saw comprises a push table frame, on which a left push plate, a movable push plate, a fixed push plate and a right push plate are arranged from left to right in sequence, a left slide rail for the left push plate to move left and right is installed on the left side of the push table frame, a right slide rail for the right push plate to move left and right is installed on the right side of the push table frame, and a middle slide rail for the movable push plate to move forward and backward is installed in the middle of the push table frame; a mounting plate for convenient installation of a dust-free saw is installed on the fixed push plate, and an opening is provided on the mounting plate for the dust-free saw blade to be exposed; a backrest matching with a wooden board is also clamped on the fixed push plate, and a push rod matching with a wooden board is clamped on the movable push plate. The push table saw has a reasonable design and various functions, which can not only meet the various cutting needs of woodworkers for wooden boards, but also can be folded and carried, greatly improving the work efficiency of woodworkers.

Description

Technical Field

[0001] The invention relates to a sliding table saw, in particular to a multifunctional sliding table saw specially used for woodworking. Background Art

[0002] 1906, in Berlin, Germany: In order to complete his furniture design, Mr. Wilhelm Odendorf invented the world's first sliding table saw, which made sawing wood quick and precise.

[0003] At present, the commonly used sliding table saw includes a bed, a workbench, longitudinal and cross-cutting guides, a main saw, a scoring saw, a transmission and other parts. Its structure and working principle are similar to those of an ordinary circular saw, and it can be used alone as an ordinary circular saw, which can effectively assist carpenters in sawing wood.

[0004] However, the existing sliding table saws are not versatile enough, and carpenters often need to use other tools to process wood, which seriously affects the work efficiency of carpenters. In addition, the sliding table saws in the prior art are generally bulky and can only be used in fixed places. They are inconvenient to carry and transport, which greatly restricts the promotion and use of sliding table saws. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a multifunctional woodworking special sliding table saw which is reasonably designed, easy to carry and can effectively improve the work efficiency of woodworking in view of the deficiencies in the prior art.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solutions. The present invention is a multifunctional woodworking sliding table saw, which includes a sliding table frame, on which a left push plate, a movable push plate, a fixed push plate and a right push plate are arranged from left to right in sequence, a left slide rail for the left push plate to move left and right is installed on the left side of the sliding table frame, a right slide rail for the right push plate to move left and right is installed on the right side of the sliding table frame, and a middle slide rail for the movable push plate to move forward and backward is installed in the middle of the sliding table frame; a mounting plate for facilitating the installation of a dust-free saw is installed on the fixed push plate, and an opening is provided on the mounting plate for facilitating the exposure of the saw blade of the dust-free saw; a backrest that cooperates with the wooden board is also clamped on the fixed push plate, and a push rod that cooperates with the wooden board is clamped on the movable push plate.

[0007] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the multifunctional woodworking sliding table saw described above, the middle slide rail includes a plurality of fixed slide blocks fixedly installed on the sliding table frame, a sliding rod is installed at the bottom of the movable push plate, a sliding cavity is provided in the fixed slide block for facilitating the movement of the sliding rod, a plurality of ball bearings are installed in the sliding cavity for facilitating the sliding of the sliding rod, and a sliding opening cooperating with the sliding rod is opened at the top of the sliding cavity.

[0008] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the multifunctional woodworking sliding table saw described above, the mounting plate on the fixed push plate is square in shape, and a mounting opening for facilitating the installation of the mounting plate is provided on the fixed push plate at the mounting opening. An annular support plate for supporting the mounting plate from the bottom is provided on the fixed push plate at the mounting opening.

[0009] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the multifunctional woodworking sliding table saw described above, the sliding table includes a left sliding table and a right sliding table, and the left sliding table and the right sliding table are hinged together by a fan-shaped hinge page. The fan-shaped hinge page includes a left hinge page fixedly mounted on the left sliding table and a right hinge page fixedly mounted on the right sliding table. The left hinge page and the right hinge page are also provided with hinge holes for facilitating fastening by hinge bolts; one side of the left hinge page and the right hinge page are both provided with end faces perpendicular to the sliding table, the end face of the left hinge page extends to the outside of the end of the left sliding table, and the end face of the right hinge page extends to the outside of the end of the right sliding table.

[0010] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the multifunctional woodworking sliding table saw described above, the bottom of the sliding table frame is also symmetrically hinged with 4 lifting support legs, and each lifting support leg is hinged with a supporting hinged rod on the sliding table frame, and the hinged rod is composed of 2 support rods with hinged ends.

[0011] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the multifunctional woodworking sliding table saw described above, the lifting support leg includes an upper support leg and a lower support leg. The top of the upper support leg is hinged to the sliding table frame, and the top of the lower support leg is inserted into the upper support leg. The upper support leg is also screwed with a fastening bolt for fastening the lower support leg.

[0012] The technical problem to be solved by the present invention can be further achieved through the following technical solutions. For the multifunctional woodworking sliding table saw described above, the push rod includes an outer rod and an inner rod with one end inserted into the outer rod, and length scales are provided on the inner rod and the outer rod; the movable push plate is also provided with an angle dial that cooperates with the push rod, and a number of positioning holes are evenly arranged on the angle dial for facilitating the positioning of the push rod.

[0013] The technical problem to be solved by the present invention can also be further achieved through the following technical scheme. For the multifunctional woodworking sliding table saw described above, the left slide rail and the right slide rail are both outer sleeves fixedly installed on the sliding table frame, and the left push plate and the right push plate are both equipped with inner sleeve rods inserted in the outer sleeve.

[0014] The technical problem to be solved by the present invention can be further achieved through the following technical solutions. For the multifunctional woodworking sliding table saw described above, the left push plate and / or the right push plate are also equipped with a first roller mechanism for facilitating the movement of the wooden board, and the first roller mechanism includes a first rectangular groove, in which a plurality of rollers are installed; the push table frame at the middle slide rail is also equipped with a second roller mechanism for facilitating the movement of the wooden board, and the second roller mechanism includes a second rectangular groove, in which a plurality of rollers are installed.

[0015] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the multifunctional woodworking table saw described above, the push rod is clamped on the movable push plate by the first clamping member, and the backrest is clamped on the fixed push plate by the second clamping member. The first clamping member and the second clamping member are both composed of a clamping body and a clamping bolt. The clamping body is composed of two plywood and a connecting plate connecting the two plywood. A clamping groove is formed between the two plywood for easy clamping on the push table frame. A connecting shaft for cooperating with the push rod or the backrest is installed on one of the plywood, and the clamping bolt is screwed on the other plywood.

[0016] Compared with the prior art, the present invention takes the fixed push plate as the reference, and can adjust the position of the movable push plate forward and backward as needed, and can adjust the position of the left push plate and the right push plate left and right, so as to be more suitable for cutting wooden boards. At the same time, the position of the dust-free saw can be adjusted by the position of the mounting plate on the fixed push plate and the movable push plate, so that the cutting of wooden boards can be conveniently adjusted, fast and efficient, and the wooden boards can be accurately cut by the cooperation of the push rod and the backrest; secondly, the push table frame and the support legs of the present application can be retracted and folded to reduce the occupation of external space, so that the carpenter can carry it with him in the car and change the work site without being restricted by the site. The push table saw has a reasonable design and various functions. It can not only meet the carpenter's various cutting needs for wooden boards, but also can be folded and carried, which greatly improves the work efficiency of carpenters. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural schematic diagram of the present invention;

[0018] Figure 2 A top view of the structure of the present invention;

[0019] Figure 3 It is a structural schematic diagram of a fixed push plate of the present invention;

[0020] Figure 4 It is a structural schematic diagram of the push rod of the present invention;

[0021] Figure 5 It is a structural schematic diagram of the backing of the present invention;

[0022] Figure 6It is a structural schematic diagram of the inner sleeve rod and the outer sleeve of the present invention;

[0023] Figure 7 This is a schematic diagram of the structure of the first clamping member and the second clamping member of the present invention;

[0024] Figure 8 It is a structural schematic diagram of a fixed sliding block of the present invention;

[0025] Fig. 9 It is a structural schematic diagram of the first roller mechanism of the present invention;

[0026] Fig.10 It is a schematic structural diagram of the second roller mechanism of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Reference Figure 1-10A multifunctional sliding table saw for woodworking, the sliding table saw comprises a sliding table frame 1, on which a left pushing plate 2, a movable pushing plate 3, a fixed pushing plate 4 and a right pushing plate 5 are arranged from left to right in sequence, a left slide rail for the left pushing plate 2 to move left and right is installed on the left side of the pushing table frame 1, a right slide rail for the right pushing plate 5 to move left and right is installed on the right side of the pushing table frame 1, and a middle slide rail for the movable pushing plate 3 to move forward and backward is installed in the middle of the pushing table frame 1; a mounting plate 16 for facilitating the installation of a dust-free saw is installed on the fixed pushing plate 4, and an opening 17 for facilitating the exposure of the saw blade of the dust-free saw is opened on the mounting plate 16; a backrest 7 cooperating with a wooden board is also clamped on the fixed pushing plate 4, and a push rod 6 cooperating with a wooden board is clamped on the movable pushing plate 3. The size of the left push plate 2 is consistent with that of the right push plate 5; the size of the movable push plate 3 is consistent with that of the fixed push plate 4; the fixed push plate 4 is fixedly installed on the push stand 1 and is used as a cutting reference for the wooden board. The movable push plate 3 can move forward and backward, and the left push plate 2 and the right push plate 5 can move left and right, which is convenient for adjustment according to the size of the wooden board, effectively supporting the wooden board, and facilitating carpenters to saw the wooden board; a mounting bracket is installed at the bottom of the mounting plate 16 for easy installation and fixation of the dust-free saw, which is convenient for the installation and disassembly of the dust-free saw; at the same time, the opening The width of 17 is slightly wider, at 3-5cm, which can facilitate the tilting of the dust-free saw blade to cut the wooden board at an angle, and the tilt angle can be manually adjusted as needed; the backrest 7 is a rectangular aluminum tube or steel tube with grooves on the top and bottom, which is convenient for clamping on the fixed push plate 4 to position the end of the wooden board and fix the wooden board in the longitudinal direction; the push rod 6 is clamped on the movable push plate 3 to position and fix the wooden board in the transverse direction, and length scales are set on the backrest 7 and the push rod 6 to facilitate measuring the wooden board.

[0029] The middle slide rail includes a plurality of fixed slide blocks 29 fixedly mounted on the push platform 1, a slide rod is mounted at the bottom of the movable push plate 3, and the slide rod is a round rod made of metal or carbide; a slide cavity 30 is provided in the fixed slide block 29 for facilitating the movement of the slide rod, a plurality of ball bearings 31 are mounted in the slide cavity 30 for facilitating the sliding of the slide rod, and a slide opening cooperating with the slide rod is provided at the top of the slide cavity 30. The fixed slider 29 is in the shape of a rectangular parallelepiped and is fixedly installed on the push platform 1. The sliding cavity 30 and the sliding rod are both in the shape of a cylinder. The sliding rod is fixedly connected to the bottom of the movable push plate 3. The setting of the sliding opening facilitates the sliding of the connection between the sliding rod and the movable push plate 3; the setting of the ball 31 is used to reduce the friction between the sliding rod and the sliding cavity 30, which is convenient for pushing the movable push plate 3. The fixed slider 29 in the sliding cavity 30 is provided with a groove that cooperates with the ball 31; the fixed sliders 29 on both sides of the push platform 1 are also screwed with limit bolts 32, and the limit bolts 32 are screwed on the fixed sliders 29. The ends of the limit bolts 32 extend into the sliding cavity 30, which are used to position the sliding rod when needed, thereby fixing the movable push plate 3; preferably, three fixed sliders 29 are provided, which are respectively installed on the two side ends and the middle of the push platform 1.

[0030] The mounting plate 16 on the fixed push plate 4 is in a square shape, and a mounting opening 18 is provided on the fixed push plate 4 for facilitating the installation of the mounting plate 16. The mounting opening 18 is the same size as the mounting plate 16, and a ring-shaped support plate 19 for supporting the mounting plate 16 from the bottom is provided on the fixed push plate 4 at the mounting opening 18. The ring-shaped support plate 19 is used to support the mounting plate 16 from the bottom, so as to facilitate the fixing of the mounting plate 16; the mounting plate 16 is in a square shape, and after the mounting plate 16 is rotated 90°, it can also be placed in the mounting opening 18, so as to facilitate the adjustment of the cutting direction of the dust-free saw on the mounting plate 16.

[0031] The push platform 1 includes a left push platform 1 and a right push platform 1, and the left push platform 1 and the right push platform 1 are hinged together by a fan-shaped hinge page, and the fan-shaped hinge page includes a left hinge page fixedly installed on the left push platform 1 and a right hinge page 9 fixedly installed on the right push platform 1. The left hinge page and the right hinge page 9 are both circular plates with a notch on one side. The left hinge page and the right hinge page 9 are also provided with hinge holes for fastening by hinge bolts; one side of the left hinge page and the right hinge page 9 are both provided with an end face perpendicular to the push platform 1, the end face of the left hinge page extends to the outside of the end of the left push platform 1, and the end face of the right hinge page 9 extends to the outside of the end of the right push platform 1. The left push platform 1 and the right push platform 1 are both composed of two transverse supports and a longitudinal support vertically connecting the two transverse supports, and the transverse supports and the longitudinal supports can be made of square tubes; the ends of the two transverse supports of the left push platform 1 and the right push platform 1 are hinged together by fan-shaped hinge pages, which are convenient for relative rotation and folded together. During normal use, they are installed on the hinge holes by hinge bolts, and then the left push platform 1 and the right push platform 1 are horizontally connected together by hinge nuts. When folding is required, the hinge nuts are loosened, and the bottoms of the left push platform 1 and the right push platform 1 are folded together, so that the bottoms of the left push platform 1 and the right push platform 1 are tightly attached, and then fixed by hinge nuts; at this time, the end faces of the left hinge page and the right hinge page 9 form a supporting plane, which is convenient for vertical placement of the push platform 1, and it will not tip over left or right, which is convenient for subsequent storage and transportation.

[0032] The bottom of the push platform 1 is also symmetrically hinged with four lifting support legs, and each lifting support leg is hinged with a supporting hinge rod 10 on the push platform 1, and the hinge rod 10 is composed of two support rods with hinged ends. The four lifting support legs are hinged at the bottom of the push platform 1 by bolts and nuts, and can rotate relative to the push platform 1, so as to facilitate the adjustment of the lifting support legs to be vertical or parallel to the push platform 1, so as to support the push platform 1 or reduce the external space occupation; the two support rods are hinged by bolts and nuts, and can rotate relative to each other. The ends of the two support rods are connected to the push platform 1 or the lifting support legs by bolts and nuts, respectively, for supporting and fixing the lifting support legs, and are also convenient for disassembly and folding. The four lifting support legs are arranged in two groups at the bottom of both sides of the push platform 1, and a connecting frame for fixing is also connected between the two lifting support legs on each side.

[0033] The lifting support leg comprises an upper support leg 11 and a lower support leg 12. The top of the upper support leg 11 is hinged to the push platform 1, and the top of the lower support leg 12 is inserted into the upper support leg 11. The upper support leg 11 is also screwed with a fastening bolt 13 for fastening the lower support leg 12. The upper support leg 11 and the lower support leg 12 are both made of square tubes, which facilitates the lower support leg 12 to be inserted into the upper support leg 11. The length of the entire lifting support leg can be adjusted by adjusting the length of the lower support leg 12 inserted into the upper support leg 11, and the lower support leg 12 can be fixed by the fastening bolt 13; the bottom of the lower support leg 12 is also equipped with a moving wheel 14 for easy movement.

[0034] The push rod 6 includes an outer rod and an inner rod 20 with one end inserted into the outer rod, and the inner rod 20 and the outer rod are both provided with length scales; the movable push plate 3 is also provided with an angle dial matched with the push rod 6, and the angle dial is evenly provided with a number of positioning holes for facilitating the positioning of the push rod 6. The inner rod 20 and the outer rod are both rectangular parallelepiped-shaped, and a cavity is provided in the outer rod for facilitating the insertion of the inner rod 20, and a fixing bolt 22 for fixing the inner rod 20 is also screwed on the outer rod; the positioning holes are provided at the positions of the angle dial at full angles, such as 30°, 45°, and 60°, and a positioning bolt is also screwed on the positioning holes for positioning the push rod 6.

[0035] The left and right slide rails are both outer sleeves 23 fixedly mounted on the push platform 1, and the left push plate 2 and the right push plate 5 are both equipped with inner sleeve rods 15 inserted in the outer sleeves 23. The outer sleeves 23 and the inner sleeve rods 15 are both made of rectangular tubes, and the ends of the outer sleeves 23 are also screwed with fixing bolts 22 for fixing the inner sleeve rods 15; the left slide rail includes two outer sleeves 23, which are respectively mounted on the two ends of the left side of the push platform 1, and the bottom of the left push plate 2 is fixedly mounted with two inner sleeve rods 15 respectively matched with the outer sleeves 23; the right slide rail includes two outer sleeves 23, which are respectively mounted on the two ends of the right side of the push platform 1, and the bottom of the right push plate 5 is fixedly mounted with two inner sleeve rods 15 respectively matched with the outer sleeves 23.

[0036] The left push plate 2 and / or the right push plate 5 are also equipped with a first roller mechanism for facilitating the movement of the wooden board, the first roller mechanism includes a first rectangular groove 33, and a plurality of rollers 34 are installed in the first rectangular groove 33; the push stand 1 at the middle slide rail is also equipped with a second roller mechanism for facilitating the movement of the wooden board, the second roller mechanism includes a second rectangular groove 35, and a plurality of rollers 34 are installed in the second rectangular groove 35. The first roller mechanism is convenient for assisting the movement of the wooden board on the left push plate 2 or the right push plate 5, and the top of the roller 34 in the first rectangular groove 33 is kept in the same level with the top of the left push plate 2 or the right push plate 5; the second roller mechanism is convenient for pushing the movable push plate 3 forward and backward, and the top of the roller 34 in the second rectangular groove 35 is in contact with the bottom of the movable push plate 3 to provide effective support.

[0037] The push rod 6 is clamped on the movable push plate 3 by a first clamping piece, and the backrest 7 is clamped on the fixed push plate 4 by a second clamping piece 8. The first clamping piece and the second clamping piece 8 are both composed of a clamping body and a clamping bolt 26. The clamping body is composed of two clamping plates 24 and a connecting plate 25 connecting the two clamping plates 24. A clamping groove is formed between the two clamping plates 24 for easy clamping on the push platform 1. A connecting shaft 27 for cooperating with the push rod 6 or the backrest 7 is installed on one of the clamping plates 24, and the clamping bolt 26 is screwed on the other clamping plate 24. The setting of the clamping bolt 26 is used to tighten the movable push plate 3 or the fixed push plate 4 when the clamping groove is clamped to the end of the movable push plate 3 or the fixed push plate 4, so as to facilitate the fixing of the first clamping piece or the second clamping piece 8. The push rod 6 is clamped on the movable push plate 3 by two first clamping members, and the first clamping member and the push rod 6 are both installed with bearings and bearing seats that match the connecting shaft 27. The connecting shaft 27 is vertically installed on the first clamping member through the bearing and the bearing seat. Due to the setting of the connecting shaft 27, the push rod 6 and the first clamping member can rotate relative to each other; the backrest 7 is clamped on the fixed push plate 4 by two second clamping members 8, and the second clamping member 8 and the backrest 7 are both installed with bearings and bearing seats that match the connecting shaft 27. The connecting shaft 27 is vertically installed on the second clamping member through the bearing and the bearing seat. On the part 8, due to the setting of the connecting shaft 27, the backrest 7 and the second clamping part 8 can rotate relative to each other; the bottom of the push rod 6 and the backrest 7 are both provided with a rectangular slide groove 21 extending from one end to the other end, and a rectangular slider 28 is provided in the rectangular slide groove 21. The rectangular slider 28 is installed with a bearing and a bearing seat that cooperates with the connecting shaft 27. The rectangular slider 28 can slide in the rectangular slide groove 21, which is convenient for adjusting the clamping position of the push rod 6 or the backrest 7; the slot width of the rectangular slide groove 21 is smaller than the width of the bottom of the rectangular slide groove 21 to prevent the rectangular slider 28 from falling out of the slot.

[0038] The inventive point of the present application is that the lifting support legs of the sliding table saw can be retracted and folded, and the left sliding platform and the right sliding platform can rotate relative to each other and overlap together. After folding, the lifting support legs can be folded between the left sliding platform and the right sliding platform to form a rectangular whole, which is convenient for stacking multiple sliding table saws together for storage and transportation; secondly, the middle slide rail that cooperates with the movable push plate is of hidden design and fixedly installed on the pushing platform, which not only facilitates the pushing and pulling of the movable push plate forward and backward, but also cannot be seen from the outside, and is beautiful and generous.

Claims

1. A multifunctional sliding table saw for woodworking, characterized in that: The push table saw comprises a push table frame, on which a left push plate, a movable push plate, a fixed push plate and a right push plate are arranged in sequence from left to right. A left slide rail for the left push plate to move left and right is installed on the left side of the push table frame, a right slide rail for the right push plate to move left and right is installed on the right side of the push table frame, and a middle slide rail for the movable push plate to move forward and backward is installed in the middle of the push table frame; a mounting plate for facilitating the installation of a dust-free saw is installed on the fixed push plate, and an opening is provided on the mounting plate for facilitating the exposure of a saw blade of the dust-free saw; a backrest cooperating with a wooden board is also clamped on the fixed push plate, and a push rod cooperating with the wooden board is clamped on the movable push plate; The middle slide rail comprises a plurality of fixed slide blocks fixedly mounted on the push platform, a slide rod is mounted at the bottom of the movable push plate, a slide cavity is arranged in the fixed slide block for facilitating the movement of the slide rod, a plurality of balls are mounted in the slide cavity for facilitating the sliding of the slide rod, and a slide opening is arranged at the top of the slide cavity for cooperating with the slide rod; The mounting plate on the fixed push plate is in a square shape, and a mounting opening is provided on the fixed push plate for facilitating the installation of the mounting plate. The fixed push plate at the mounting opening is also provided with an annular support plate for supporting the mounting plate from the bottom; The push platform comprises a left push platform and a right push platform, and the left push platform and the right push platform are hinged together by a fan-shaped hinge page, and the fan-shaped hinge page comprises a left hinge page fixedly installed on the left push platform and a right hinge page fixedly installed on the right push platform, and the left hinge page and the right hinge page are also provided with hinge holes for facilitating fastening by hinge bolts; one side of the left hinge page and the right hinge page are both provided with end faces perpendicular to the push platform, and the end face of the left hinge page extends to the outside of the end of the left push platform, and the end face of the right hinge page extends to the outside of the end of the right push platform; The bottom of the push platform is also symmetrically hinged with four lifting support legs, each lifting support leg is hinged with a supporting hinge rod on the push platform, and the hinge rod is composed of two support rods with hinged ends; The lifting support leg comprises an upper support leg and a lower support leg, the top of the upper support leg is hinged to the push platform, the top of the lower support leg is inserted into the upper support leg, and the upper support leg is also screwed with a fastening bolt for fastening the lower support leg; The push rod comprises an outer rod and an inner rod with one end inserted into the outer rod, and length scales are arranged on the inner rod and the outer rod; the movable push plate is also provided with an angle dial matched with the push rod, and a plurality of positioning holes are evenly arranged on the angle dial for facilitating the positioning of the push rod; The left and right slide rails are both outer sleeves fixedly mounted on the push platform, and the left and right push plates are both equipped with inner sleeve rods for plugging into the outer sleeves; The left push plate and / or the right push plate are also equipped with a first roller mechanism for facilitating the movement of the wooden board, the first roller mechanism comprising a first rectangular groove, in which a plurality of rollers are installed; the push platform at the middle slide rail is also equipped with a second roller mechanism for facilitating the movement of the wooden board, the second roller mechanism comprising a second rectangular groove, in which a plurality of rollers are installed; The push rod is clamped on the movable push plate by the first clamping member, and the backrest is clamped on the fixed push plate by the second clamping member. The first clamping member and the second clamping member are both composed of a clamping body and a clamping bolt. The clamping body is composed of two clamping plates and a connecting plate connecting the two clamping plates. A clamping groove is formed between the two clamping plates for easy clamping on the push platform. A connecting shaft for cooperating with the push rod or the backrest is installed on one of the clamping plates, and the clamping bolt is screwed on the other clamping plate.

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