A safe and anti-tilt chair

Abstract

The present invention relates to a class chair, and in particular to a safe anti-dumping class chair. A safe anti-dumping class chair is provided, which can prevent a user from falling. The present invention is achieved through the following technical means: a safe anti-dumping class chair, comprising a base, a support frame, a seat board, a backboard, etc., a backboard for a user to lean on the back is provided at the rear side of the seat board, support frames are symmetrically provided at the bottom of the seat board, and bases are provided at the bottom of the support frames. When a user sits on the seat board, an armrest frame can limit the left and right sides of the user to prevent the user from falling from the left and right sides of the seat board; when the user accidentally falls backward, the U-shaped limit rod is always against the ground, so that the U-shaped limit rod can support the class chair to prevent the user from falling directly.

Description

Technical Field

[0001] The invention relates to a classroom chair, in particular to a safe and anti-dumping classroom chair. Background Art

[0002] A chair is a chair that students sit on during class. During recess, students often sit on the chair to play. This will change the center of gravity of the students, making it easy for them to lose balance, causing both the students and the chair to fall to the ground.

[0003] Patent application number CN201220546328.X discloses an anti-falling chair, which is characterized in that a vertical beam is provided under the chair surface at an angle of 75 degrees to the chair surface, and anti-slip pads are provided at the lower ends of the chair legs. The friction between the anti-slip pads and the ground can prevent the chair from falling over, but the chair does not protect the user, and the user may slide from the left and right sides of the chair surface, so the safety of the chair is not high.

[0004] Therefore need to design a kind of safety anti-tipping school chair that can prevent the user from falling. Summary of the invention

[0005] In order to overcome the disadvantage that the existing anti-falling chair does not protect the user and the user may slide down from the left and right sides of the chair surface, thus the safety of the chair is not high, a safe anti-falling chair is provided which can prevent the user from falling.

[0006] The present invention is achieved through the following technical approaches: a safe anti-dumping classroom chair, including a base, a support frame, a seat board and a backboard, a backboard for the user to lean on the back is provided on the rear side of the seat board, support frames are symmetrically provided at the bottom of the seat board, bases are provided at the bottom of the support frames, and also include an anti-dumping component and an anti-side-falling component, an anti-dumping component that can prevent the user from tipping backwards is connected between the base and the support frame, and an anti-side-falling component that can prevent the user from tipping over from the seat board is provided on the support frame.

[0007] As a preferred technical approach of the present invention, the anti-dumping assembly includes a first connecting rod, a first spring, a rack, a sliding rod, a second connecting rod, a third connecting rod, a U-shaped limit rod, a first torsion spring, a limit block and a gear. The first connecting rod is slidably provided on the rear side of the base, and the first spring is connected between the front side of the first connecting rod and the adjacent base. Racks are slidably provided on the left and right sides of the base, and the racks are composed of an inner rack and an outer rack. Sliding rods are slidably provided in the support frame, and second connecting rods are symmetrically rotated front and back on the lower side of the sliding rods. The second connecting rods on the front side are connected to The inner rack is rotatably connected, and the second connecting rods on the rear side are rotatably connected to the outer rack. Gears are rotatably provided on the front side of the base, and the gears are meshed with adjacent inner racks and outer racks. The inner racks are in contact with adjacent first connecting rods. A third connecting rod is provided on the inner upper side of the sliding rod. A U-shaped limit rod that can resist the ground to support the safety anti-dumping chair is rotatably connected between the third connecting rods. A first torsion spring is connected between the U-shaped limit rod and the third connecting rod. A limit block is provided on the inner upper side of the sliding rod, and the limit block is located on the upper side of the third connecting rod.

[0008] As a preferred technical approach of the present invention, the anti-rollover assembly includes a V-shaped elastic sheet, an armrest frame, a fourth connecting rod and a second spring. A V-shaped elastic sheet is provided on the lower outer side of the support frame, and an armrest frame that can block the left and right sides of the user is slidably provided on the upper outer side of the support frame. A fourth connecting rod is provided at the bottom of the armrest frame, and a second spring is symmetrically connected to the top of the fourth connecting rod and the adjacent support frame front and back.

[0009] As a preferred technical approach of the present invention, it also includes a protective component that can prevent the safe anti-dumping classroom chair from tipping over excessively, thereby playing a protective role. The protective component includes a T-shaped rod, a pull rope, a third spring, a support plate, a fifth connecting rod, a sixth connecting rod, an L-shaped sliding sleeve, a first wedge block, a fourth spring and a second torsion spring. A T-shaped rod is slidably provided in the middle of the upper side of the sliding rod, and a third spring is connected between the top of the T-shaped rod and the seat plate. A support plate that can contact the ground after rotation to support the backboard is rotatably provided on the upper rear side of the backboard. A fifth connecting rod is provided at the upper front inner part of the back plate, and a sixth connecting rod is rotatably provided at both sides of the fifth connecting rod, a second torsion spring is connected between the sixth connecting rod and the fifth connecting rod, an L-shaped sliding sleeve is symmetrically provided at the upper front inner part of the back plate, a first wedge block capable of clamping the sixth connecting rod is slidably provided in the L-shaped sliding sleeve, a fourth spring is connected between the first wedge block and the adjacent L-shaped sliding sleeve, the sixth connecting rod is in contact with the adjacent first wedge block, the sixth connecting rod is in contact with the support plate, and the T-shaped rods on the left and right sides are connected to the first wedge blocks by a pull rope.

[0010] As a preferred technical approach of the present invention, it also includes a buffer component for the user's head to lean against, the buffer component includes a buffer block, a U-shaped connecting rod, a seventh connecting rod, a third torsion spring, a straight sliding sleeve, a second wedge block and an elastic member, U-shaped connecting rods are symmetrically arranged on the left and right sides of the upper inner part of the backrest plate, the seventh connecting rod is rotatably arranged on the U-shaped connecting rod, the third torsion spring is symmetrically connected between the seventh connecting rod and the adjacent U-shaped connecting rod, a buffer block is rotatably connected between the bottom of the seventh connecting rod and can be used for the user's head to lean against after rotating to the top of the backrest plate, a straight sliding sleeve is provided on the outer side of the lower part of the sixth connecting rod, a second wedge block is slidably arranged in the straight sliding sleeve, the second wedge block is connected to the adjacent sixth connecting rod with an elastic member, and the second wedge block is in contact with the seventh connecting rod on the upper side.

[0011] As a preferred technical approach of the present invention, it also includes a shielding component that can prevent the user from accidentally kicking the first connecting rod. The shielding component includes a shielding plate, an eighth connecting rod and a fourth torsion spring. The eighth connecting rod is provided on the rear side of the base. The eighth connecting rod is rotatably provided with a shielding plate that can block the first connecting rod. The fourth torsion spring is connected between the left and right sides of the front part of the shielding plate and the adjacent base.

[0012] As a preferred technical approach of the present invention, it also includes a locking component that can lock the support plate and prevent it from rotating easily. The locking component includes a connecting block, a fifth spring and a locking block. A connecting block is slidably provided on the lower side of the support plate, a fifth spring is connected between the top of the connecting block and the support plate, a locking block is provided at the bottom of the connecting block, and a locking groove that fits with the locking block is opened in the middle of the rear side of the upper part of the support plate.

[0013] As a preferred technical approach of the present invention, the buffer block is made of rubber.

[0014] Compared with the prior art, the present invention has the following significant improvements: 1. When a user sits on the seat board, the armrests can limit the left and right sides of the user to prevent the user from falling from the left and right sides of the seat board.

[0015] 2. When the user accidentally falls backward, the U-shaped limit rod always presses against the ground, so that the U-shaped limit rod can support the chair and prevent the user from falling directly.

[0016] 3 When the first connecting rod can no longer move forward in the base, and the base is still rotating backward, the support plate can support the back plate to prevent the back plate from colliding with the ground, thereby preventing the user from being injured.

[0017] 4. After the buffer block is rotated upward, it can support the user's head to prevent the user's head from colliding with the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a schematic diagram of the first three-dimensional structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the second three-dimensional structure of the present invention.

[0020] Figure 3 It is a schematic diagram of the cross-sectional three-dimensional structure of the present invention.

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the anti-dumping assembly of the present invention.

[0022] Figure 5 It is a schematic diagram of the enlarged three-dimensional structure of point A of the present invention.

[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of the anti-tilt assembly of the present invention.

[0024] Figure 7 This is a schematic diagram of the first three-dimensional structure of the protective component of the present invention.

[0025] Figure 8 This is a schematic diagram of the second three-dimensional structure of the protective component of the present invention.

[0026] Fig. 9 It is a schematic diagram of the enlarged three-dimensional structure of point B of the present invention.

[0027] Fig.10 It is a schematic diagram of the three-dimensional structure of the buffer assembly of the present invention.

[0028] Fig.11 It is a schematic diagram of the enlarged three-dimensional structure of point C of the present invention.

[0029] Fig.12 It is a schematic diagram of the three-dimensional structure of the shielding component of the present invention.

[0030] Fig.13 It is a schematic diagram of the enlarged three-dimensional structure of point D of the present invention.

[0031] Fig.14 It is a schematic diagram of the three-dimensional structure of the clamping assembly of the present invention.

[0032] Marked in the figure: 1-base, 2-support frame, 3-seat plate, 4-back plate, 5-anti-dumping assembly, 51-first connecting rod, 52-first spring, 53-rack, 54-sliding rod, 55-second connecting rod, 56-third connecting rod, 57-U-shaped limiting rod, 58-first torsion spring, 59-limiting block, 510-gear, 6-anti-side-over assembly, 61-V-shaped elastic sheet, 62-handrail frame, 63-fourth connecting rod, 64-second spring, 7-protection assembly, 71-T-shaped rod, 72-pull rope, 73-third spring, 74- Support plate, 75-fifth connecting rod, 76-sixth connecting rod, 77-L-shaped sliding sleeve, 78-first wedge block, 79-fourth spring, 710-second torsion spring, 8-buffer assembly, 81-buffer block, 82-U-shaped connecting rod, 83-seventh connecting rod, 84-third torsion spring, 85-straight sliding sleeve, 851-second wedge block, 852-elastic member, 9-shielding assembly, 91-shielding plate, 92-eighth connecting rod, 93-fourth torsion spring, 10-locking assembly, 101-connecting block, 102-fifth spring, 103-locking block. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0034] Example 1

[0035] A safe and anti-tilt chair, referring to Figure 1-3 As shown, it includes a base 1, a support frame 2, a seat plate 3, a backboard 4, an anti-dumping component 5 and an anti-side-falling component 6. The backboard 4 is welded to the rear side of the seat plate 3, and the backboard 4 can be used for the user to lean on the back. The bottom of the seat plate 3 is symmetrically welded with a support frame 2, and the bottom of the support frame 2 is welded with a base 1. An anti-dumping component 5 is connected between the base 1 and the support frame 2, and the anti-dumping component 5 can prevent the user from tipping backward. The support frame 2 is provided with an anti-side-falling component 6, and the anti-side-falling component 6 can prevent the user from tipping over from the seat plate 3.

[0036] Reference Figure 4 and Figure 5As shown, the anti-dumping assembly 5 includes a first connecting rod 51, a first spring 52, a rack 53, a slide bar 54, a second connecting rod 55, a third connecting rod 56, a U-shaped limit rod 57, a first torsion spring 58, a limit block 59 and a gear 510. The first connecting rod 51 is slidably provided on the rear side of the base 1, and the first spring 52 is connected between the front side of the first connecting rod 51 and the adjacent base 1. Racks 53 are slidably provided on the left and right sides of the base 1, and the racks 53 are composed of an inner rack 531 and an outer rack 532. Slide bars 54 are slidably provided in the support frame 2, and the lower side of the slide bars 54 is symmetrically rotatably provided with second connecting rods 55. The front second connecting rods 55 are rotatably connected to the inner rack 531, and the rear second connecting rods 55 are rotatably connected to the inner rack 531. The second connecting rod 55 is rotatably connected to the outer rack 532, and a gear 510 is rotatably provided on the inner front side of the base 1. The gear 510 is meshed with the adjacent inner rack 531 and the outer rack 532, and the inner rack 531 is in contact with the adjacent first connecting rod 51. The third connecting rod 56 is rotatably connected to the third connecting rod 56 by welding. The U-shaped limiting rod 57 is rotatably connected between the third connecting rod 56. The U-shaped limiting rod 57 can resist the ground to support the safety anti-dumping chair, and a first torsion spring 58 is connected between the U-shaped limiting rod 57 and the third connecting rod 56. A limiting block 59 is welded on the inner upper side of the sliding rod 54, and the limiting block 59 is located on the upper side of the third connecting rod 56.

[0037] Reference Figure 6 As shown, the anti-rollover component 6 includes a V-shaped elastic sheet 61, an armrest frame 62, a fourth connecting rod 63 and a second spring 64. A V-shaped elastic sheet 61 is provided on the lower outer side of the support frame 2, and an armrest frame 62 is slidably provided on the upper outer side of the support frame 2. The armrest frame 62 can block the left and right sides of the user. The bottom of the armrest frame 62 is welded with a fourth connecting rod 63, and the top of the fourth connecting rod 63 and the adjacent support frame 2 are symmetrically connected with a second spring 64 front and back.

[0038] When the class chair is needed, the user can sit on the seat board 3 and lean his back on the back board 4. When listening to the class, the user can also put his hands on the armrests 62 to listen to the class. When the user does not sit firmly and causes the chair to tip over, the armrests 62 can block the user to prevent the user from falling from the left and right sides of the seat board 3. When the armrests 62 are not needed, the user can press the armrests 62 to drive the fourth connecting rod 63 to move downward, and the second spring 64 is stretched. When the fourth connecting rod 63 contacts the V-shaped elastic sheet 61 and continues to move, the V-shaped elastic sheet 61 will be deformed. When the fourth connecting rod 63 passes over the V-shaped elastic sheet 61, the V-shaped elastic sheet 61 automatically resets. The elastic force of the second spring 64 is greater than the elastic force of the second spring 64, so that the fourth connecting rod 63 can be stuck, and then the armrest frame 62 can be stuck. When the armrest frame 62 is needed, the armrest frame 62 is pulled to drive the fourth connecting rod 63 to move upward and reset. The second spring 64 is reset, and the V-shaped elastic sheet 61 is deformed again and then reset. When the user leans backward, the backrest 4 is flipped backward, so that the seat plate 3, the support frame 2 and the base 1 are flipped backward. The backward flipping of the base 1 drives the first connecting rod 51 to reverse backward. The rear side of the first connecting rod 51 is against the ground, so that the first connecting rod 51 moves forward in the base 1, the first spring 52 is stretched, and the first connecting rod 51 moves forward to drive The inner rack 531 moves forward, and the outer rack 532 can be moved backward through the gear 510. In this way, the two adjacent racks 53 move toward each other, and the sliding bar 54 can be pulled downward by the second connecting rod 55. The downward movement of the sliding bar 54 drives the third connecting rod 56, the U-shaped limiting rod 57, the first torsion spring 58 and the limiting block 59 to move downward. At this time, the rear side of the U-shaped limiting rod 57 is against the ground, so that the U-shaped limiting rod 57 will rotate on the third connecting rod 56, and the first torsion spring 58 will be deformed. At the same time, under the reaction force of the first torsion spring 58, the U-shaped limiting rod 57 can be kept against the ground. When the U-shaped limiting rod 57 contacts the limiting block 59, the U-shaped limiting rod 57 When the user sits firmly, the base 1 will be laid flat, so that the first connecting rod 51 will move backward and reset under the action of the first spring 52. At this time, the U-shaped limiting rod 57 is against the ground, so that the first torsion spring 58 is reset to make the U-shaped limiting rod 57 rotate and reset on the third connecting rod 56, and at the same time, the third connecting rod 56, the U-shaped limiting rod 57, the limiting block 59 and the sliding rod 54 can be moved upward and reset. The sliding rod 54 moves upward and resets, and the rack 53 can be moved and reset through the second connecting rod 55, so that the user can be protected and prevented from falling.

[0039] Example 2

[0040] Based on Example 1, Figure 2 , Figure 7 , Figure 8 and Fig. 9 As shown, it also includes a protection component 7, which can prevent the safe anti-dumping classroom chair from tipping over excessively, thereby playing a protective role. The protection component 7 includes a T-shaped rod 71, a pull rope 72, a third spring 73, a support plate 74, a fifth connecting rod 75, a sixth connecting rod 76, an L-shaped sliding sleeve 77, a first wedge block 78, a fourth spring 79 and a second torsion spring 710. The middle part of the upper side of the sliding rod 54 is slidably provided with a T-shaped rod 71, and the top of the T-shaped rod 71 is connected to the seat plate 3 with a third spring 73. The upper part of the rear side of the backrest plate 4 is rotatably provided with a support plate 74. After the support plate 74 rotates, it can contact the ground to support the backrest plate 4, and the inner front side of the backrest plate 4 A fifth connecting rod 75 is provided on the upper part by welding, and a sixth connecting rod 76 is rotatably provided on both sides of the fifth connecting rod 75, and a second torsion spring 710 is connected between the sixth connecting rod 76 and the fifth connecting rod 75. An L-shaped sliding sleeve 77 is symmetrically welded on the upper inner front side of the support plate 4, and a first wedge block 78 is slidably provided in the L-shaped sliding sleeve 77. A fourth spring 79 is connected between the first wedge block 78 and the adjacent L-shaped sliding sleeve 77, and the sixth connecting rod 76 is in contact with the adjacent first wedge block 78, and the sixth connecting rod 76 is in contact with the support plate 74. The T-shaped rods 71 ​​on the left and right sides are connected to the first wedge block 78 by a pull rope 72.

[0041] Initially, the second torsion spring 710 is in a deformed state. When the sliding rod 54 moves downward until it contacts the lower portion of the T-shaped rod 71 and continues to move, the T-shaped rod 71 can be moved downward, the third spring 73 is stretched, and the T-shaped rod 71 moves downward, pulling the first wedge block 78 inward through the pull rope 72 to release the sixth connecting rod 76. The fourth spring 79 is compressed, and the sixth connecting rod 76 rotates backward under the action of the second torsion spring 710. The backward rotation of the sixth connecting rod 76 drives the support plate 74 to rotate backward. In this way, it can be prevented that when the first connecting rod 51 can no longer move forward in the base 1, and the base 1 is still rotating backward at this time, the back plate 4 will directly collide with the ground. At this time, the support plate 74 can support the back plate 4 to prevent the back plate 4 from colliding with the ground, thereby preventing the user from being When the user stands firmly and restores the chair to a flat state, the slide bar 54 moves upward and resets, no longer pressing the T-bar 71. Under the action of the third spring 73, the T-bar 71 moves upward to release the pull rope 72, so that under the action of the fourth spring 79, the first wedge block 78 moves outward and resets. The user can then rotate the support plate 74 forward to reset it. The rotation and reset of the support plate 74 drives the sixth connecting rod 76 to rotate forward. The second torsion spring 710 is deformed, and the sixth connecting rod 76 rotates forward and contacts the first wedge block 78. When it continues to rotate, the first wedge block 78 moves inward and the fourth spring 79 is compressed. When the sixth connecting rod 76 passes over the first wedge block 78, the first wedge block 78 moves outward and resets under the action of the fourth spring 79 to jam the sixth connecting rod 76.

[0042] Reference Figure 2 , Fig.10 and Fig.11 As shown, a buffer assembly 8 is also included, and the buffer assembly 8 can be used for the user's head to lean on. The buffer assembly 8 includes a buffer block 81, a U-shaped connecting rod 82, a seventh connecting rod 83, a third torsion spring 84, a straight sliding sleeve 85, a second wedge block 851 and an elastic member 852. The left and right sides of the upper inner part of the back plate 4 are symmetrically provided with U-shaped connecting rods 82 by welding, and the U-shaped connecting rods 82 are rotatably provided with seventh connecting rods 83. The seventh connecting rod 83 and the adjacent U-shaped connecting rods 82 are symmetrically connected to the first connecting rod 83. Three torsion springs 84 and a buffer block 81 are rotatably connected between the bottom of the seventh connecting rod 83. The buffer block 81 is made of rubber. After the buffer block 81 is rotated to the top of the backrest 4, the user's head can lean against it. A straight sliding sleeve 85 is welded on the outer side of the lower part of the sixth connecting rod 76. A second wedge block 851 is slidably provided in the straight sliding sleeve 85. The second wedge block 851 is connected to the adjacent sixth connecting rod 76 with an elastic member 852. The second wedge block 851 is in contact with the seventh connecting rod 83 on the upper side.

[0043] Initially, the third torsion spring 84 is in a deformed state, and the sixth connecting rod 76 rotates backward to drive the straight sliding sleeve 85, the second wedge block 851 and the elastic member 852 to rotate backward. The second wedge block 851 rotates backward and no longer resists the seventh connecting rod 83 on the upper side. Under the action of the third torsion spring 84, the seventh connecting rod 83 rotates upward, and the upward rotation of the seventh connecting rod 83 can drive the buffer block 81 to rotate. The buffer block 81 rotates and resets to be on the upper side of the backrest plate 4. During this period, the second wedge block 851 rotates until it contacts the backrest plate 4 and continues to rotate. Under the action of the backrest plate 4, the second wedge block 851 can move inward, and the elastic member 852 is compressed, so that the second wedge block 851 will not affect the rotation of the seventh connecting rod 83. In this way, the user's head can be rested on the buffer block 81, thereby preventing the user's head from contacting the ground when the chair tips over. The sixth connecting rod 76 rotates forward to drive the straight sliding sleeve 85, the second wedge block 851 and the elastic member 852 to rotate forward. At this time, the second wedge block 851 is not supported by the back plate 4 and can be moved outward and reset under the action of the elastic member 852. Then, the buffer block 81 can be rotated to drive the seventh connecting rod 83 to rotate and reset. The third torsion spring 84 is deformed. At this time, the upper seventh connecting rod 83 rotates and resets to contact the second wedge block 851, thereby causing the second wedge block 851 to move inward and the elastic member 852 to be compressed. After the upper seventh connecting rod 83 passes over the second wedge block 851, the second wedge block 851 moves outward and clamps the upper seventh connecting rod 83 under the action of the elastic member 852.

[0044] Reference Figure 2 , Fig.12 and Fig.13 As shown, a shielding component 9 is also included, which can prevent the user from accidentally kicking the first connecting rod 51. The shielding component 9 includes a shielding plate 91, an eighth connecting rod 92 and a fourth torsion spring 93. The eighth connecting rod 92 is welded on the rear side of the base 1, and a shielding plate 91 is rotatably provided on the eighth connecting rod 92. The shielding plate 91 can shield the first connecting rod 51, and a fourth torsion spring 93 is connected between the left and right sides of the front part of the shielding plate 91 and the adjacent base 1.

[0045] When the chair is in normal use, the shielding plate 91 can block the first connecting rod 51 to prevent the user from accidentally kicking the first connecting rod 51. When the chair falls backward, the shielding plate 91 contacts the ground and rotates on the eighth connecting rod 92, causing the fourth torsion spring 93 to deform. When the chair is straightened, the shielding plate 91 rotates and returns to its original position under the action of the fourth torsion spring 93.

[0046] Reference Figure 3 and Fig.14 As shown, it also includes a locking component 10, which can lock the support plate 74 and prevent it from rotating easily. The locking component 10 includes a connecting block 101, a fifth spring 102 and a locking block 103. The connecting block 101 is slidably provided on the lower side of the support plate 74, and the fifth spring 102 is connected between the top of the connecting block 101 and the support plate 74. The locking block 103 is welded on the bottom of the connecting block 101, and a slot that fits with the locking block 103 is opened in the middle of the upper rear side of the support plate 4.

[0047] When the chair is in normal use, the block 103 can be stuck by the back plate 4, thus preventing the support plate 74 from constantly swinging on the back plate 4 and affecting its use. When the support plate 74 rotates backward to drive the connecting block 101, the fifth spring 102 and the block 103 to rotate backward, the block 103 will move upward under the action of the back plate 4, and the fifth spring 102 will be compressed. When the block 103 passes over the back plate 4, the block 103 moves downward and resets under the action of the fifth spring 102. When the chair is straightened and the support plate 74 is rotated and reset, the block 103 contacts the back plate 4 and continues to rotate to move upward, and the fifth spring 102 is compressed. When the block 103 is in the slot of the back plate 4, the block 103 moves downward and resets under the action of the fifth spring 102, thereby fixing the support plate 74.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A safe and anti-tilt classroom chair, comprising a base (1), a support frame (2), a seat board (3) and a backboard (4), wherein the back side of the seat board (3) is provided with a backboard (4) for a user to lean on, the bottom of the seat board (3) is symmetrically provided with a support frame (2), and the bottom of each support frame (2) is provided with a base (1), characterized in that: The invention also comprises an anti-tipping component (5) and an anti-side-falling component (6); the anti-tipping component (5) capable of preventing a user from tipping backwards is connected between the base (1) and the support frame (2); the anti-side-falling component (6) capable of preventing a user from tipping over from the seat plate (3) is provided on the support frame (2); the anti-tipping component (5) comprises a first connecting rod (51), a first spring (52), a rack (53), a sliding rod (54), a second connecting rod (55), a third connecting rod (56), a U-shaped limiting rod (57), a first torsion spring (58), a limiting block (59) and a gear (510); the base (1) is connected to the support frame (2) and the anti-tipping component (55) is connected to the support frame (2) and the anti-side-falling component (6) is connected to the support frame (2) and the anti-tipping component (51) is connected to the support frame (2) and the anti-tipping component (5 ... ) are provided with a first connecting rod (51) in a sliding manner on the rear side, a first spring (52) is connected between the front side of the first connecting rod (51) and the adjacent base (1), racks (53) are provided in a sliding manner on the left and right sides of the base (1), the racks (53) are composed of an inner rack (531) and an outer rack (532), a sliding rod (54) is provided in a sliding manner in the support frame (2), and a second connecting rod (55) is provided on the lower side of the sliding rod (54) in a front-to-back symmetrical rotational manner, the second connecting rod (55) on the front side is rotationally connected to the inner rack (531), and the second connecting rod (55) on the rear side is rotationally connected to the outer rack (532). ) is rotatably connected, a gear (510) is rotatably provided on the inner front side of the base (1), the gear (510) is meshed with the adjacent inner rack (531) and the outer rack (532), the inner rack (531) is in contact with the adjacent first connecting rod (51), a third connecting rod (56) is rotatably connected between the third connecting rods (56) to support the ground, and a first torsion spring (58) is connected between the U-shaped limiting rod (57) and the third connecting rod (56), and the sliding rod (54) is provided with a third connecting rod (56) on the inner upper side. A limit block (59) is provided on the upper side, and the limit block (59) is located on the upper side of the third connecting rod (56); the anti-side fall component (6) comprises a V-shaped elastic sheet (61), an armrest frame (62), a fourth connecting rod (63) and a second spring (64); the lower outer side of the support frame (2) is provided with a V-shaped elastic sheet (61); the upper outer side of the support frame (2) is provided with an armrest frame (62) capable of blocking the left and right sides of the user in a sliding manner; the bottom of the armrest frame (62) is provided with a fourth connecting rod (63); the top of the fourth connecting rod (63) and the adjacent support frame (2) are symmetrically connected to the second spring (64) in a front-to-back manner.

2. A safe anti-dumping chair according to claim 1, characterized in that: The invention also includes a protective assembly (7) capable of preventing the safe anti-tipping chair from tipping over excessively, thereby achieving a protective effect. The protective assembly (7) includes a T-shaped rod (71), a pull rope (72), a third spring (73), a support plate (74), a fifth connecting rod (75), a sixth connecting rod (76), an L-shaped sliding sleeve (77), a first wedge block (78), a fourth spring (79) and a second torsion spring (710). The middle part of the upper side of the sliding rod (54) is slidably provided with a T-shaped rod (71), the top of the T-shaped rod (71) is connected to the seat plate (3) with a third spring (73), the upper part of the rear side of the backrest plate (4) is rotatably provided with a support plate (74) which can contact the ground after rotation to support the backrest plate (4), and the upper part of the inner front side of the backrest plate (4) is provided with a third spring (73). Five connecting rods (75), the fifth connecting rod (75) is rotatably provided with a sixth connecting rod (76) on both sides, the sixth connecting rod (76) and the fifth connecting rod (75) are connected with a second torsion spring (710), an L-shaped sliding sleeve (77) is symmetrically provided on the upper front side of the support plate (4), a first wedge block (78) capable of clamping the sixth connecting rod (76) is slidably provided in the L-shaped sliding sleeve (77), a fourth spring (79) is connected between the first wedge block (78) and the adjacent L-shaped sliding sleeve (77), the sixth connecting rod (76) is in contact with the adjacent first wedge block (78), the sixth connecting rod (76) is in contact with the support plate (74), and the T-shaped rods (71) on the left and right sides are connected with the first wedge block (78) by a pull rope (72).

3. A safe anti-dumping chair according to claim 2, characterized in that: The device also comprises a buffer assembly (8) capable of supporting the head of a user, the buffer assembly (8) comprising a buffer block (81), a U-shaped connecting rod (82), a seventh connecting rod (83), a third torsion spring (84), a straight sliding sleeve (85), a second wedge block (851) and an elastic member (852), U-shaped connecting rods (82) are symmetrically arranged on both sides of the upper inner portion of the support plate (4), the seventh connecting rod (83) is rotatably arranged on the U-shaped connecting rod (82), and the seventh connecting rod (83) and the adjacent U-shaped connecting rod (82) are symmetrically arranged on both sides. A third torsion spring (84) is symmetrically connected, a buffer block (81) is rotatably connected between the bottom of the seventh connecting rod (83) and can be used for the user's head to lean against after being rotated to the top of the backrest plate (4), a straight sliding sleeve (85) is provided on the outer side of the lower part of the sixth connecting rod (76), a second wedge block (851) is slidably provided inside the straight sliding sleeve (85), an elastic member (852) is connected between the second wedge block (851) and the adjacent sixth connecting rod (76), and the second wedge block (851) is in contact with the seventh connecting rod (83) on the upper side.

4. A safe anti-dumping chair according to claim 3, characterized in that: It also includes a shielding assembly (9) capable of preventing a user from accidentally kicking the first connecting rod (51), the shielding assembly (9) comprising a shielding plate (91), an eighth connecting rod (92) and a fourth torsion spring (93), the rear side of the base (1) is provided with an eighth connecting rod (92), the eighth connecting rod (92) is rotatably provided with a shielding plate (91) capable of shielding the first connecting rod (51), and the fourth torsion spring (93) is connected between the left and right sides of the front part of the shielding plate (91) and the adjacent base (1).

5. The safe anti-dumping chair according to claim 4, characterized in that: It also includes a locking assembly (10) capable of locking the support plate (74) so ​​that it does not rotate easily. The locking assembly (10) includes a connecting block (101), a fifth spring (102) and a locking block (103). The connecting block (101) is slidably provided on the lower inner side of the support plate (74). The fifth spring (102) is connected between the top of the connecting block (101) and the support plate (74). The locking block (103) is provided on the bottom of the connecting block (101). A locking groove that fits with the locking block (103) is provided in the middle of the upper rear side of the support plate (4).

6. A safe anti-dumping chair according to claim 5, characterized in that: The buffer block (81) is made of rubber.

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