A gear-type heavy-duty swivel chair chassis and its usage method

Abstract

The present invention relates to swivel chairs and office chairs, and particularly relates to a gear-type heavy swivel chair chassis and its usage method. It includes a chassis main body, on one side inside the chassis main body, a locking seat is installed, on one side inside the locking seat, a mounting seat is connected, a control member is installed on the mounting seat, a locking component is connected to one side of the locking seat, the chassis main body is provided with a mounting hole corresponding to the locking component, an adjusting component is connected to one side of the chassis main body, a connecting block is connected to one side of the inner wall of the chassis main body, and a movable seat is connected to one side of the chassis main body. The structure of this application is simple, optimizing the adjustment process of traditional swivel chairs. The required angle is adjusted through the control seat adjusting rod and the back adjusting rod, simplifying the adjustment method. The adjusting nut set for people with different weights can adjust the tightness of the spring according to different weights, so as to achieve the most reasonable matching restoring force, thereby making the product have better versatility.

Description

Technical Field

[0001] The present invention belongs to the technical field of swivel chairs and office chairs, and particularly relates to a gear-type heavy swivel chair chassis and a using method thereof. Background Art

[0002] A swivel chair chassis, also known as a swivel chair tray, is an important component installed under the seat cushion of a swivel chair, capable of realizing the lifting of the seat cushion and the adjustment of the reclining angle of the backrest. Currently, the swivel chair trays generally consist of components such as a tray body, a rocker, a rotating shaft, and a spring device. The rocker is fixed to the back of the swivel chair seat, and the backrest of the swivel chair can be appropriately reclined around the rotating shaft and can elastically return, providing a comfortable feeling for the user. The existing swivel chair chassis has a relatively complex structure and troublesome adjustment, which is not user-friendly for some middle-aged and even elderly people. Often, a single adjustment lever undertakes the adjustment requirements for the seat, backrest, and lifting, resulting in relatively high adjustment difficulty, inconvenient use, and the overall structure of the traditional chassis design is relatively thick, indirectly making the overall thickness of the chair seat board look relatively thick, causing a certain sense of discomfort.

[0003] The object of the present invention is to solve the drawback of relatively high adjustment difficulty in the current technology and propose a gear-type heavy swivel chair chassis and a using method thereof.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a gear-type heavy swivel chair chassis, including a chassis main body. Inside one side of the chassis main body, a locking seat is installed. Inside one side of the locking seat, a mounting seat is connected. A control member is installed on the mounting seat. One side of the locking seat is connected with a locking component. The chassis main body is provided with a mounting hole corresponding to the locking component. One side of the chassis main body is connected with an adjusting component. One side of the inner wall of the chassis main body is connected with a connecting block. One side of the chassis main body is connected with a movable seat. One side of the inner wall of the chassis main body is installed with a backrest locking piece. One side of the movable seat is connected with a mounting rivet. The mounting rivet sequentially passes through the movable seat, the backrest locking piece, and the chassis main body to install and connect them. One side of the backrest locking piece is connected with a first limit rivet. A first limit groove is provided on the upper side of the backrest locking piece. Both sides of the chassis main body are connected with armrest connecting components.

[0005] Preferably, one side of the bottom of the chassis main body is connected with a mounting foot, and the other side of the chassis main body is connected with a cross bar. Inside one side of the chassis main body, a fixing screw is provided. The installation of the mounting foot facilitates the installation of the chassis on the swivel chair.

[0006] Preferably, the mounting base is provided with a movable slot, and a movable rod is arranged in the movable slot. The number of the movable rods is two. One end of each movable rod is connected with a control member. The control member is made of plastic, and the number of the control members is two. The control member includes a seat control block and a back control block. One end of the surfaces of the seat control block and the back control block is provided with a connecting groove, and a square groove is arranged on one side of the connecting groove. The adjustment of the seat and the backrest is facilitated by arranging the control member.

[0007] Preferably, the locking assembly includes a first locking member, a second locking member is arranged on one side of the first locking member, a retaining ring is connected to one end of the first locking member, a seat locking adjustment spring is connected to one side of the retaining ring, a retaining ring is connected to one end of the second locking member, and a backrest locking adjustment spring is connected to one side of the retaining ring. The seat locking adjustment spring is connected to the backrest locking adjustment spring. The locking assembly can be effectively fixed by arranging the retaining ring.

[0008] Preferably, a tapered tube is arranged on one side of the connecting block, a shock absorption assembly is installed on the outer side of the tapered tube. The shock absorption assembly includes a shock absorption buffer rubber, an anti-wear bushing is installed on the outer side of the shock absorption buffer rubber, a protective shell is installed on the outer side of the anti-wear bushing. A fixing plate is arranged on one side of the connecting block, and a second limiting groove is arranged on one side of the connecting block. The service life of the tapered tube and the pneumatic rod can be effectively improved by arranging the shock absorption assembly.

[0009] Preferably, a mounting hole is arranged on the fixing plate, the mounting hole is associated with a fixing screw. A seat locking piece is connected to one side of the fixing plate, a small-sized rivet is connected to one side of the seat locking piece. The small-sized rivet sequentially passes through the connecting block and the seat locking piece to connect them. A torsion spring is connected to one side of the fixing plate, a corrugated sheath is connected to the outer side of the torsion spring. One end of the torsion spring is connected with a bowl-shaped gasket, and an adjusting nut is installed at one end of the bowl-shaped gasket. The adjusting nut is connected to the fixing screw. The tightness of the backrest can be adjusted by arranging the adjusting nut.

[0010] Preferably, the adjusting assembly includes a lifting adjusting rod, a seat adjusting rod is installed on one side of the lifting adjusting rod, a backrest adjusting rod is installed on one side of the seat adjusting rod. The seat adjusting rod is connected to one side of the mounting base, and the backrest adjusting rod is connected to the other side of the mounting base. The height of the seat can be adjusted by arranging the lifting adjusting rod.

[0011] Preferably, a second limiting rivet is connected to one side of the chassis main body, a connecting rivet is arranged on one side of the second limiting rivet. The second limiting rivet and the connecting rivet sequentially pass through the chassis main body and the connecting block to install and connect them. The movement of the connecting block within the position of the second limiting groove is facilitated by arranging the second limiting rivet.

[0012] Preferably, the armrest connection assembly includes a first armrest telescopic rod, the first armrest telescopic rod is provided with a second armrest telescopic rod, and the first armrest telescopic rod and the second armrest telescopic rod are installed on both sides of the chassis body. By providing the first armrest telescopic rod and the second armrest telescopic rod, the front and rear length and the upper and lower height can be adjusted to meet the needs of consumers with different body shapes and weights.

[0013] Preferred:

[0014] 1. Install the chassis body at the bottom of the seat by installing the feet and the cross bar, and the cone tube position is used to install the gas pressure rod. When the seat cushion needs to be adjusted forward and backward inclination angle, first move the seat adjustment rod by hand, and the seat control block is driven to move forward by the seat locking adjustment spring to complete the seat cushion unlocking, and then adjust the seat cushion angle by hand or with the buttocks. The adjustment angle range is determined by the second limit groove. After adjusting to a suitable angle, move the seat adjustment rod again, and the seat control block is driven to move backward by the seat locking adjustment spring to complete automatic locking. The seat cushion itself has a rebound protection function. When the seat cushion is adjusted to a certain angle, after locking, the seat adjustment rod is adjusted to the released position by moving the seat adjustment rod. The seat cushion will not be directly released and reset. A person needs to sit on the rear end of the seat cushion with his buttocks to apply a downward force. This downward force drives the seat locking adjustment spring, and the seat locking adjustment spring drives the first locking component to move to one side, and one end of the first locking component pops out from the first slot, and then it will be unlocked and released;

[0015] Second, when the backrest needs to be adjusted in angle, the back adjustment lever is manually moved and held down, and the back locking adjustment spring drives the back control block to move forward to complete the unlocking of the backrest. The person sitting on the chair can adjust the required angle by leaning back. The adjustment angle range is determined by the first limit slot. After adjusting to the desired position, the back adjustment lever is released, and the back locking adjustment spring drives the seat control block to move backward to complete the automatic locking. The backrest itself has a rebound protection function. When the backrest is reclined to the end and locked, the back adjustment lever is moved to the released position, and the backrest will not be released. The person needs to lean against the backrest and apply a backward force to the backrest to release it. This backward force drives the back locking adjustment spring, and the back locking adjustment spring drives the second locking component to move to one side, and one end of the second locking component pops out from the second slot, so that it can be released. The purpose is to prevent sudden release and hitting the back of the person.

[0016] 3. When you need to adjust the tightness of the backrest, tighten or loosen the adjusting nut to adjust the tension of the spring, thereby adjusting the forward and backward rocking force;

[0017] 4. When the position of the armrest needs to be adjusted, the first armrest telescopic rod and the second armrest telescopic rod can be adjusted in length and height front and back to meet the needs of consumers with different body shapes and weights.

[0018] The advantages of the present invention are as follows:

[0019] The structure of this application is simple, optimizing the adjustment process of traditional swivel chairs. By controlling the seat adjustment rod and the back adjustment rod, the required angle can be adjusted, simplifying the adjustment method. The adjustment nuts set for people with different weights can adjust the tightness of the spring according to different weights, so as to achieve the most reasonable matching restoring force, making the product have better versatility and meeting the needs of people with different weights and body shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the structure of the present invention.

[0022] Figure 2 It is an exploded view of the structure of the present invention.

[0023] Figure 3 It is a top view of the structure of the present invention with the seat and the back locked separately.

[0024] Figure 4 It is the structure of the present invention Figure 3 The cross-sectional view taken along A-A in the middle.

[0025] Figure 5 It is a cross-sectional view of the structure of the present invention with the seat and the back swinging.

[0026] Figure 6 It is a top view of the structure of the present invention with the seat and the back unlocked separately.

[0027] Figure 7 It is an exploded view of the shock-absorbing component of the structure of the present invention.

[0028] In the figure: 1. Adjusting nut; 2. Bowl-shaped gasket; 3. Torsion spring; 4. Corrugated sheath; 5. Protective housing; 6. Tapered pipe; 7. Fixed plate; 8. Connecting block; 9. Seat locking piece; 10. Small rivet; 11. Lifting and adjusting rod; 12. Second limit rivet; 13. Connecting rivet; 14. Seat adjusting rod; 15. Back adjusting rod; 16. First arm telescopic rod; 17. Seat control block; 18. Back control block; 19. Mounting seat; 20. Locking seat; 21. First limit rivet; 22. Movable seat; 23. Fixed screw; 24. Chassis main body; 25. Cross bar; 26. Second arm telescopic rod; 27. Snap ring; 28. First locking component; 29. Second locking component; 30. Seat locking and adjusting spring; 31. Back locking and adjusting spring; 32. Mounting foot; 33. Mounting rivet; 34. Back locking piece; 35. First limit groove; 36. Second limit groove; 37. Anti-wear bushing; 38. Shock-absorbing buffer rubber; 39. First card slot; 40. Second card slot. Detailed implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0030] Please refer to Figure 1-7 As shown, a gear-type heavy chassis includes a chassis main body 24. On one side inside the chassis main body 24, a locking seat 20 is installed. On one side inside the locking seat 20, a mounting seat 19 is connected. A control member is installed on the mounting seat 19. On one side of the locking seat 20, a locking component is connected. The chassis main body 24 is provided with a mounting hole corresponding to the locking component. On one side of the chassis main body 24, an adjusting component is connected. On one side of the inner wall of the chassis main body 24, a connecting block 8 is connected. On one side of the chassis main body 24, a movable seat 22 is connected. On one side of the inner wall of the chassis main body 24, a back locking piece 34 is installed. On one side of the movable seat 22, two mounting rivets 33 are connected. The mounting rivets 33 pass through the movable seat 22, the back locking piece 34, and the chassis main body 24 in sequence to install and connect them. On one side of the back locking piece 34, a first limit rivet 21 is connected. On the upper side of the back locking piece 34, a first limit groove 35 is provided. The first limit rivet 21 is connected to the first limit groove 35. The width of the first limit groove 35 is the swing interval of the movable seat 22. Arm connection components are connected to both sides of the chassis main body 24. The chassis main body 24 is provided with mounting holes corresponding to the installation of each component.

[0031] In this embodiment, one side of the bottom of the chassis main body 24 is connected with a mounting foot 32, the other side of the chassis main body 24 is connected with a cross bar 25, one side inside the chassis main body 24 is provided with a fixing screw 23, and the mounting foot 32 and the cross bar 25 can be fixed to the bottom of the swivel chair by screwing.

[0032] In this embodiment, the mounting seat 19 is provided with a movable groove, a movable rod is arranged in the movable groove, the number of the movable rods is two, the movable rods are fixed in the mounting seat 19, one end of each movable rod is connected with a control member, the control member is made of plastic, the number of the control members is two, the control member includes a seat control block 17 and a back control block 18, and a connecting groove is arranged at one end of the surfaces of the seat control block 17 and the back control block 18, and a square groove is arranged on one side of the connecting groove. By arranging the control member, it is convenient to adjust the seat and the backrest.

[0033] In this embodiment, the locking assembly includes a first locking member 28, a second locking member 29 is arranged on one side of the first locking member 28, a retaining ring 27 is connected to one end of the first locking member 28, a seat locking adjustment spring 30 is connected to one side of the retaining ring 27, a retaining ring 27 is connected to one end of the second locking member 29, the number of the retaining rings 27 is two, the retaining rings 27 are common products on the market and can be directly purchased, a backrest locking adjustment spring 31 is connected to one side of the retaining ring 27, the seat locking adjustment spring 30 is connected with the backrest locking adjustment spring 31, the seat locking adjustment spring 30 and the backrest locking adjustment spring 31 are jointly connected to the seat control block 17 and the back control block 18, and the first locking member 28 and the second locking member 29 sequentially pass through the locking seat 20, the seat locking adjustment spring 30 and the backrest locking adjustment spring 31 to connect and fix them, and the retaining ring 27 can effectively fix the locking member.

[0034] In this embodiment, a tapered tube 6 is arranged on one side of the connecting block 8, the tapered tube 6 is used for installing and connecting a gas spring, the gas spring is a common product on the market and can be directly purchased, a shock absorption assembly is installed on the outer side of the tapered tube 6, the shock absorption assembly includes a shock absorption buffer rubber 38, an anti-wear bushing 37 is installed on the outer side of the shock absorption buffer rubber 38, a protective shell 5 is installed on the outer side of the anti-wear bushing 37, a fixing plate 7 is arranged on one side of the connecting block 8, a second limiting groove 36 is arranged on one side of the connecting block 8, and the second limiting groove 36 is connected by a limit rivet. The width of the second limiting groove 36 is the swinging range of the connecting block 8. By arranging the shock absorption assembly, the service life of the tapered tube 6 and the gas spring can be effectively improved.

[0035] In this embodiment, the fixing plate 7 is provided with mounting holes, which are associated with the fixing screw 23. One side of the fixing plate 7 is connected with a seat locking piece 9, and one side of the seat locking piece 9 is connected with a small rivet 10. The number of the small rivets 10 is two. The small rivets 10 sequentially pass through the connecting block 8 and the seat locking piece 9 to connect them. One side of the fixing plate 7 is connected with a torsion spring 3. The outer side of the torsion spring 3 is connected with a corrugated sheath 4. One end of the torsion spring 3 is connected with a bowl-shaped gasket 2, and one end of the bowl-shaped gasket 2 is provided with an adjusting nut 1, and the adjusting nut 1 is connected with the fixing screw 23. By setting the adjusting nut 1, it is convenient to adjust the tightness of the backrest.

[0036] In this embodiment, the adjusting assembly includes a lifting adjusting rod 11. One end of the lifting adjusting rod 11 is installed below the tapered tube 6. One side of the lifting adjusting rod 11 is installed with a seat adjusting rod 14, and one side of the seat adjusting rod 14 is installed with a back adjusting rod 15. The seat adjusting rod 14 is connected with one side of the mounting seat 19, and the back adjusting rod 15 is connected with the other side of the mounting seat 19. By setting the lifting adjusting rod 11, it is convenient to adjust the height of the seat.

[0037] In this embodiment, one side of the chassis main body 24 is connected with a second limit rivet 12, and there is a connecting rivet 13 on one side of the second limit rivet 12. The second limit rivet 12 and the connecting rivet 13 sequentially pass through the chassis main body 24 and the connecting block 8 to install and connect them, and the connecting rivet 13 fixes it. The limit rivet restricts its swing angle range. By setting the second limit rivet 12, it is convenient for the connecting block 8 to move within the position of the second limit groove 36.

[0038] In this embodiment, the armrest connection assembly includes a first armrest telescopic rod 16, and the first armrest telescopic rod 16 is provided with a second armrest telescopic rod 26. The first armrest telescopic rod 16 and the second armrest telescopic rod 26 are installed on both sides of the chassis main body 24. The first armrest telescopic rod 16 and the second armrest telescopic rod 26 can both be adjusted in terms of the front-back length and the up-down height. By setting the first armrest telescopic rod 16 and the second armrest telescopic rod 26, it is convenient to meet the needs of consumers with different body sizes and weights.

[0039] The implementation principle of this embodiment is as follows: Regarding the adjustment of the locking state, because there is an 8-shaped or gourd-shaped structure on the locking seat 20, which are actually two stop positions, the stop positions in the loosened or locked state. So when operating, there is no need to hold it manually all the time. Just reach the position, and then the spring force will directly form a preset force on the mechanism, enabling the mechanism to realize the transformation between the locked and loosened states in the state of allowing loosening. Here, the so-called allowing loosening refers to the return force protection function. The specific content of the return force protection function is as follows:

[0040] 1. Install the chassis main body 24 on the bottom of the seat through the mounting feet 32 and the cross bar 25. The position of the tapered tube 6 is for installing the pneumatic rod. When it is necessary to adjust the front-back tilt angle of the seat cushion, first use your hand to move the seat adjustment lever 14, drive the seat control block 17 to move forward through the seat locking adjustment spring 30, and complete the unlocking of the seat cushion. Use your hand or your hip to adjust the angle of the seat cushion. The adjustment angle range is determined by the second limit groove 36. Adjust to the appropriate angle, and then move the seat adjustment lever 14 again. Drive the seat control block 17 to move backward through the seat locking adjustment spring 30 to complete the automatic locking. The seat cushion itself has a return force protection function. When the seat cushion is adjusted to a certain angle and locked, move the seat adjustment lever 14 to the release position, and the seat cushion will not directly loosen and reset. It is necessary for a person to sit on the rear end of the seat cushion and apply a downward force. This downward force drives the seat locking adjustment spring 30, and the seat locking adjustment spring 30 drives the first locking component 28 to move to one side. One end of the first locking component 28 pops out from the first card slot 39, and then it will be unlocked and loosened;

[0041] 2. When it is necessary to adjust the reclining angle of the backrest, use your hand to move the back adjustment lever 15 and hold it down. Drive the back control block 18 to move forward through the back locking adjustment spring 31 to complete the unlocking of the backrest. A person sitting on the chair can adjust the required angle by leaning back. The adjustment angle range is determined by the first limit groove 35. After adjusting to the desired position, release the back adjustment lever 15, drive the seat control block 17 to move backward through the back locking adjustment spring 31 to complete the automatic locking. The backrest itself has a return force protection function. When the backrest reclines to the end and is locked, move the back adjustment lever 15 to the release position, and the backrest will not loosen. It is necessary for a person to lean on the backrest and apply a backward force to the backrest to loosen it. This backward force drives the back locking adjustment spring 31, and the back locking adjustment spring 31 drives the second locking component 29 to move to one side. One end of the second locking component 29 pops out from the second card slot 40, so that it can be loosened. The purpose is to prevent sudden loosening and hitting people's backs;

[0042] 3. When it is necessary to adjust the tightness of the backrest reclining, by tightening or loosening the adjusting nut 1, adjust its tightness to clamp or release the tension of the spring, so as to achieve the purpose of adjusting the front-back rocking force;

[0043] 4. When it is necessary to adjust the position of the armrest, the first armrest telescopic rod 16 and the second armrest telescopic rod 26 can be adjusted in terms of front-back length and up-down height, so as to meet the needs of consumers with different body sizes and weights.

[0044] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0045] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A gear - type heavy - duty chassis, including a chassis main body. On one side inside the chassis main body, a locking seat is installed. On one side inside the locking seat, a mounting seat is connected. A control member is installed on the mounting seat. On one side of the locking seat, a locking component is connected. The chassis main body is provided with a mounting hole corresponding to the locking component. On one side of the chassis main body, an adjusting component is connected. On one side of the inner wall of the chassis main body, a connecting block is connected. On one side of the chassis main body, a movable seat is connected. On one side of the inner wall of the chassis main body, a back locking piece is installed. On one side of the movable seat, a mounting rivet is connected. The mounting rivet sequentially passes through the movable seat, the back locking piece, and the chassis main body to install and connect them. On one side of the back locking piece, a first limit rivet is connected. On one side of the upper part of the back locking piece, a first limit groove is provided. The first limit groove is connected through the first limit rivet. The width of the first limit groove is the swing range of the movable seat. Armrest connecting components are connected to both sides of the chassis main body; There is a movable groove on the mounting seat. Inside the movable groove, there are movable rods. The number of the movable rods is two. One end of each movable rod is connected to a control member. The number of the control members is two. The control member includes a seat control block and a back control block. At one end of the surfaces of the seat control block and the back control block, there are connecting grooves. There is a connecting groove on the surface of one end of the control member. There is a square groove on one side of the connecting groove; The locking component includes a first locking part. On one side of the first locking part, there is a second locking part. One end of the first locking part is connected to a circlip. On one side of the circlip, a seat locking adjustment spring is connected. One end of the second locking part is connected to a circlip. On one side of the circlip, a back locking adjustment spring is connected. The seat locking adjustment spring is connected to the back locking adjustment spring; The seat locking adjustment spring and the back locking adjustment spring jointly connect the seat control block and the back control block. The first locking part and the second locking part sequentially pass through the locking seat, the seat locking adjustment spring, and the back locking adjustment spring to connect and fix them. The adjusting component includes a lifting adjustment rod. On one side of the lifting adjustment rod, a seat adjustment rod is installed. On one side of the seat adjustment rod, a back adjustment rod is installed. The seat adjustment rod is connected to one side of the mounting seat. The back adjustment rod is connected to the other side of the mounting seat.

2. The stepped heavy chassis according to claim 1, wherein: On one side of the bottom of the chassis main body, a mounting foot is connected. On the other side of the chassis main body, a cross bar is connected. On one side inside the chassis main body, a fixing screw is provided.

3. A stepped heavy chassis according to claim 2, characterized in that: On one side of the upper part of the connecting block, a taper tube is provided. On the outside of the taper tube, a shock - absorbing component is installed. The shock - absorbing component includes a shock - absorbing buffer rubber. On the outside of the shock - absorbing buffer rubber, an anti - wear bushing is installed. On the outside of the anti - wear bushing, a protective shell is installed. On one side of the upper part of the connecting block, a fixing plate is provided. On one side of the connecting block, a second limit groove is provided.

4. A stepped heavy-duty chassis according to claim 3, characterized in that: The fixing plate is provided with a mounting hole, and the mounting hole is associated with the fixing screw. A seat locking plate is connected to one side of the fixing plate, and a small rivet is connected to one side of the seat locking plate. The small rivet passes through the connecting block and the seat locking plate in sequence to connect them. A torsion spring is connected to one side of the fixing plate, and a corrugated sheath is connected to the outside of the torsion spring. A bowl-shaped gasket is connected to one end of the torsion spring, and an adjusting nut is installed on one end of the bowl-shaped gasket, and the adjusting nut is connected to the fixing screw.

5. A stepped heavy-duty chassis according to claim 1, wherein: A second limiting rivet is connected to one side of the chassis body, and a connecting rivet is provided on one side of the second limiting rivet. The second limiting rivet and the connecting rivet pass through the chassis body and the connecting block in sequence to install and connect them.

6. A stepped heavy-duty chassis according to claim 1, characterized in that: The armrest connecting assembly comprises a first armrest telescopic rod, the first armrest telescopic rod is provided with a second armrest telescopic rod, and the first armrest telescopic rod and the second armrest telescopic rod are mounted on both sides of the chassis body.

7. A method for using a gear-type heavy chassis as described in claim 4, characterized in that :

1. Install the chassis body at the bottom of the seat by installing the feet and the cross bar, and the cone tube position is used to install the gas pressure rod. When the seat cushion needs to be adjusted forward and backward inclination angle, first move the seat adjustment rod by hand, and the seat control block is driven to move forward by the seat locking adjustment spring to complete the seat cushion unlocking, and then adjust the seat cushion angle by hand or with the buttocks. The adjustment angle range is determined by the second limit groove. After adjusting to a suitable angle, move the seat adjustment rod again, and the seat control block is driven to move backward by the seat locking adjustment spring to complete automatic locking. The seat cushion itself has a rebound protection function. When the seat cushion is adjusted to a certain angle, after locking, the seat adjustment rod is adjusted to the released position by moving the seat adjustment rod. The seat cushion will not be directly released and reset. A person needs to sit on the rear end of the seat cushion with his buttocks to apply a downward force. This downward force drives the seat locking adjustment spring, and the seat locking adjustment spring drives the first locking component to move to one side, and one end of the first locking component pops out from the first slot, and then it will be unlocked and released; Second, when the backrest needs to be adjusted in angle, the back adjustment lever is manually moved and held down, and the back locking adjustment spring drives the back control block to move forward to complete the unlocking of the backrest. The person sitting on the chair can adjust the required angle by leaning back. The adjustment angle range is determined by the first limit slot. After adjusting to the desired position, the back adjustment lever is released, and the back locking adjustment spring drives the seat control block to move backward to complete the automatic locking. The backrest itself has a rebound protection function. When the backrest is reclined to the end and locked, the back adjustment lever is moved to the released position, and the backrest will not be released. The person needs to lean against the backrest and apply a backward force to the backrest to release it. This backward force drives the back locking adjustment spring, and the back locking adjustment spring drives the second locking component to move to one side, and one end of the second locking component pops out from the second slot, so that it can be released. The purpose is to prevent sudden release and hitting the back of the person.

3. When you need to adjust the tightness of the backrest, tighten or loosen the adjusting nut to adjust the tension of the spring, thereby adjusting the forward and backward rocking force; IV. When the position of the armrest needs to be adjusted, the first armrest telescopic rod and the second armrest telescopic rod can be adjusted in terms of the front-back length and the up-down height, so as to meet the needs of consumers with different body sizes and weights.

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