阅读说明：本技术 一种转椅底盘的多功能调节装置及其使用方法 (Multifunctional adjusting device for chassis of swivel chair and using method thereof ) 是由 黄余成 于 2020-12-25 设计创作，主要内容包括：本发明涉及转椅技术领域,具体为一种转椅底盘的多功能调节装置及其使用方法,装置包括壳体和靠背安装板,靠背安装板通过主销轴铰接于壳体上,靠背安装板上设有与主销轴平行的顶进轴,壳体内设有弹力组件、调节组件以及推进块,弹力组件包括第一弹簧以及第二弹簧,第一弹簧的一端和第二弹簧的一端共同抵接于调节组件上,调节组件调节第一弹簧和第二弹簧夹角；方法包括步骤一,解锁工序；步骤二,弹性调节工序,该工序包括：夹角调节以及有效圈数调节；步骤三,升降调节工序。通过调节组件快速调节第一弹簧和第二弹簧之间的夹角,同时通过解锁工序、弹性调节工序以及升降调节工序的调节方法配合夹角调节和有效圈数调节,调节快,弹力大。(The invention relates to the technical field of swivel chairs, in particular to a multifunctional adjusting device of a swivel chair chassis and a use method thereof, wherein the device comprises a shell and a backrest mounting plate, the backrest mounting plate is hinged on the shell through a main pin shaft, a jacking shaft parallel to the main pin shaft is arranged on the backrest mounting plate, an elastic component, an adjusting component and a pushing block are arranged in the shell, the elastic component comprises a first spring and a second spring, one end of the first spring and one end of the second spring are abutted against the adjusting component together, and the adjusting component adjusts an included angle between the first spring and the second spring; the method comprises the steps of firstly, unlocking; step two, an elasticity adjusting process, which comprises the following steps: adjusting included angles and effective turns; and step three, a lifting adjusting procedure. The included angle between the first spring and the second spring is rapidly adjusted through the adjusting assembly, and meanwhile, the adjusting method through the unlocking process, the elastic adjusting process and the lifting adjusting process is matched with the included angle adjusting and the effective number of turns adjusting, so that the adjusting is rapid, and the elasticity is large.)

1. The utility model provides a multi-functional adjusting device on swivel chair chassis, includes casing (1) and back mounting panel (2), back mounting panel (2) hinge through swizzle axle (21) in on casing (1), be equipped with on back mounting panel (2) with the parallel axle (22) that advances of swizzle axle (21), its characterized in that: be equipped with elasticity subassembly (4), adjusting part (5) and advance piece (6) in casing (1), elasticity subassembly (4) include first spring (41) and second spring (42), the common butt of the one end of first spring (41) and the one end of second spring (42) in on adjusting part (5), adjusting part (5) are adjusted first spring (41) and second spring (42) contained angle, the other end of first spring (41) and the other end of second spring (42) articulate jointly in one side of advancing piece (6), it locates to advance piece (6) the cover advance on axle (22).

2. A multifunctional adjustment device of a swivel chair chassis according to claim 1, characterized in that it further comprises an angle adjustment assembly (3), said angle adjustment assembly (3) comprising:

the adjusting plate (31) is sleeved on the main pin shaft (21) and the jacking shaft (22), the adjusting plate (31) swings around the main pin shaft (21) along with the backrest mounting plate (2), a plurality of gear holes (311) are formed in the free swinging end part of the adjusting plate (31), and locking holes (11) are formed in the shell (1) corresponding to the gear holes (311);

the locking rod (32) is arranged on the shell (1) in a sliding mode along the axis of the locking hole (11), and the locking rod (32) can be inserted into the gear hole (311) in a matched mode to lock the adjusting plate (31); and

the first adjusting rod (33) is arranged outside the shell (1) and penetrates through the side wall of the shell (1) to be in transmission connection with the locking rod (32).

3. A multifunctional adjustment device of a swivel chair chassis according to claim 1, characterized in that the adjustment assembly (5) comprises:

the rotating handle (51), the said rotating handle (51) penetrates into the cavity of the said body (1) from outside the said body (1), it rotates freely relative to the said body (1);

a first set of drive teeth (52), the first set of drive teeth (52) being disposed at a drive end of the rotating handle (51);

the screw (53) is arranged in the shell (1) along the vertical direction, and the first transmission tooth group (52) is used for transmitting the rotation of the screw (53); and

the moving piece A (54) is sleeved on the screw rod (53), the screw rod (53) rotates in the forward and reverse directions to drive the moving piece A (54) to reciprocate up and down, and the moving piece A (54) is hinged to drive the first spring (41) to change the included angle of the first spring (41) relative to the second spring (42).

4. The multifunctional adjusting device of the swivel chair chassis according to claim 3, further comprising a moving member B (55), wherein the moving member B (55) is sleeved on the screw rod (53), the screw rod (53) rotates forward and backward to drive the moving member B (55) to reciprocate up and down, and the moving member B (55) is hinged to drive the second spring (42) to change an included angle of the second spring (42) relative to the first spring (41).

5. Multifunctional adjustment device of a swivel chair chassis according to claim 4, characterized in that one end of the screw (53) is provided with a right-handed thread and the other end is provided with a left-handed thread.

6. The multifunctional adjusting device for the chassis of the swivel chair of claim 3, further comprising a first turn number adjusting unit (56), wherein the first turn number adjusting unit (56) is arranged at the end of the first spring (41) to adjust the elastic force of the first spring (41), the first turn number adjusting unit (56) comprises a connecting piece (561), a rotating driving wheel a (562), a rotating rod (563) and a separating piece (564), the connecting piece (561) connects the first spring (41) and the moving piece A (54), the rotating rod (563) is rotatably arranged in the connecting piece (561), a rack (12) is arranged on the inner wall of the housing (1), the rotating driving wheel a (562) is in meshing transmission with the rack (12), and the rotating driving wheel a (562) drives the rotating rod (563) to rotate, the separating piece (564) is arranged at the end of the rotating rod (563), the spacer (564) is inserted into a gap of the first spring (41) to adjust an effective number of turns of the first spring (41).

7. The multifunctional adjusting device for the chassis of the swivel chair of claim 6, further comprising a second turn number adjusting unit (57), wherein the second turn number adjusting unit (57) is arranged at the end of the second spring (42) to adjust the elastic force of the second spring (42), the second turn number adjusting unit (57) comprises a rotating driving wheel b (571), the rotating driving wheel b (571) is arranged as a conical gear, and the top of the screw rod (53) is provided with a bevel gear (531) in meshing transmission with the rotating driving wheel b (571).

8. A multifunctional adjustment device of a swivel chair chassis according to claim 4 characterized in that the end of the second spring (42) is also provided with a set of the turn number adjustment units one (56).

9. A multifunctional adjustment device of a revolving chair chassis according to claim 1, characterized in that it further comprises a lifting and stirring assembly (8), said lifting and stirring assembly (8) comprising:

the third adjusting rod (81) is sleeved on the second adjusting rod (721), and the third adjusting rod (81) extends into the inner cavity of the shell (1) and is integrally connected with a top plate (82); and

the swinging piece (83) is sleeved on the main pin shaft (21), and the top plate (82) is abutted to drive the swinging piece (83) to swing around the main pin shaft (21).

10. A multifunctional adjusting method of a revolving chair chassis is characterized by comprising the following steps:

step one, an unlocking procedure, namely rotating a first adjusting rod (33) to enable a locking rod (32) to be separated from a gear hole (311), and at the moment, an adjusting plate (31) can be driven by a backrest mounting plate (2) to rotate around a main pin shaft (21);

step two, an elasticity adjusting process, which comprises the following steps:

a) the included angle is adjusted, the included angle of the first spring (41) relative to the second spring (42) is adjusted through a rotating handle (51), so that the resultant force of the first spring (41) and the second spring (42) is adjusted, and the elastic restoring force of the backrest mounting plate (2) is adjusted;

b) effective turn number adjustment, wherein a separator (564) in the turn number adjusting unit I (56) and the turn number adjusting unit II (57) is driven to rotate by a rotating rod (563) while the angle between the first spring (41) and the second spring (42) is changed, and the separator (564) changes the effective turn number of the first spring (41) and the second spring (42) so as to change the elastic force of the first spring and the second spring;

and step three, a lifting adjusting process, namely, a third adjusting rod (81) is pulled to push the swinging piece (83) to swing around the main pin shaft (21), and the swinging piece (83) is used for controlling the lifting of the shell (1).

Technical Field

The invention relates to the technical field of swivel chairs, in particular to a multifunctional adjusting device for a swivel chair chassis and a using method thereof.

Background

A swivel chair tray, also called a swivel chair chassis, is an important part arranged below a seat cushion of a swivel chair, and can realize the lifting of the seat cushion and the inclination angle adjustment of a backrest. The tray of the prior swivel chair generally comprises a tray body, a wane, a rotating shaft, a spring device and other parts, wherein the wane is fixed with the back of the seat of the swivel chair, and the back of the seat of the swivel chair can properly tilt around the rotating shaft and can elastically return, so that a user has comfortable feeling. The existing swivel chair backrest has insufficient elastic force and is troublesome to adjust.

Patent document No. CN201410479184.4 discloses a chair back rocker locking mechanism for a swivel chair chassis, which comprises a locking plate, a torsion spring a, a bolt and a bolt seat, wherein a row of locking holes are arranged on the locking plate, the locking plate is fixedly connected with a fourth pin shaft and synchronously moves along with the fourth pin shaft under the action of the rocker, the fourth pin shaft is a whole long shaft, the bolt seat is beside the locking plate, the bolt seat is fixedly connected with a base of the chassis, the bolt is slidably inserted on the bolt seat and matched with the locking hole, a first spring arm of the torsion spring a is connected with the bolt, and a second spring arm of the torsion spring a is connected to a driving device for driving the torsion spring a to rotate back and forth.

However, the inventor finds that the hardness of the spring of the swivel chair tray cannot be quickly adjusted in the using process, and the elastic force is not large enough.

Disclosure of Invention

In view of the above problems, it is an object of the present invention to provide a multifunctional adjustment device for a chassis of a swivel chair, which adjusts an included angle between a first spring and a second spring through an adjustment assembly, so that an elastic force applied to a backrest mounting plate by an elastic assembly is adjusted quickly and the elastic force is large, thereby solving the above-mentioned problems in the prior art that the hardness of the spring cannot be adjusted quickly by a swivel chair tray, and the magnitude of the elastic force is not large enough.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a multi-functional adjusting device on swivel chair chassis, includes casing and back mounting panel, the back mounting panel pass through the swizzle axle articulate in on the casing, be equipped with on the back mounting panel with the parallel axle that advances of swizzle axle, its characterized in that: be equipped with elasticity subassembly, adjusting part and propulsion piece in the casing, the elasticity subassembly includes first spring and second spring, the common butt of the one end of first spring and the one end of second spring in on the adjusting part, the adjusting part is adjusted first spring and second spring contained angle, the other end of first spring and the other end of second spring articulate jointly in one side of propulsion piece, it locates to advance the piece cover the epaxial in top.

As an improvement, the device further comprises an angle adjusting assembly, wherein the angle adjusting assembly comprises:

the adjusting plate is sleeved on the main pin shaft and the jacking shaft, swings around the main pin shaft along with the backrest mounting plate, a plurality of gear holes are formed in the free swinging end of the adjusting plate, and locking holes are formed in the shell corresponding to the gear holes;

the locking rod is arranged on the shell in a sliding mode along the axis of the locking hole and can be inserted into the gear hole in a matched mode to lock the adjusting plate; and

the first adjusting rod is arranged outside the shell and penetrates through the side wall of the shell to be in transmission connection with the locking rod.

As an improvement, the adjustment assembly comprises:

the rotating handle penetrates into the inner cavity of the shell from the outside of the shell and freely rotates relative to the shell;

the first transmission gear set is arranged at the transmission end part of the rotating handle;

the screw is arranged in the shell along the vertical direction, and the first transmission tooth group transmits the screw to rotate; and

the moving piece A is sleeved on the screw rod, the screw rod rotates in the forward and reverse directions to drive the moving piece A to reciprocate up and down, and the moving piece A is hinged to drive the first spring to change the included angle of the first spring relative to the second spring.

As an improvement, the spring support further comprises a moving member B, the moving member B is sleeved on the screw rod, the screw rod rotates in the forward and reverse directions to drive the moving member B to reciprocate up and down, and the moving member B is hinged to drive the second spring to change an included angle of the second spring relative to the first spring.

As an improvement, one end of the screw is provided with a right-handed thread, and the other end of the screw is provided with a left-handed thread.

As the improvement, still include the number of turns regulating unit one, the number of turns regulating unit one set up in the tip of first spring is right first spring carries out the elastic force and adjusts, number of turns regulating unit one includes connecting piece, rotatory drive wheel an, bull stick and separator, the connecting piece is connected first spring with moving member A, the bull stick rotate set up in the connecting piece, shells inner wall sets up the rack, rotatory drive wheel an with the rack toothing transmission, and this rotatory drive wheel a drive the bull stick is rotatory, the separator set up in the tip of bull stick, the separator is pegged graft and is gone into be used for adjusting in the clearance of first spring the effective number of turns of first spring.

As an improvement, still include number of turns regulating unit two, number of turns regulating unit two set up in the tip of second spring is right the second spring carries out the elastic force and adjusts, number of turns regulating unit two is including rotatory drive wheel b, rotatory drive wheel b sets up to conical gear, the top of screw rod be equipped with rotatory drive wheel b meshing transmission's bevel gear.

As a modification, the end part of the second spring is also provided with a group of first turn number adjusting units.

As the improvement, still include the lift and stir subassembly, the lift stir subassembly includes:

the third adjusting rod is sleeved on the second adjusting rod and extends into the inner cavity of the shell to be integrally connected with a top plate; and

the swinging piece is sleeved on the main pin shaft, and the top plate is abutted to drive the swinging piece to swing around the main pin shaft.

In view of the above problems, another object of the present invention is to provide a multifunctional adjustment method for a chassis of a swivel chair, which further rapidly adjusts the magnitude of the elastic force by adjusting the adjustment methods of the unlocking process, the elastic adjustment process and the lifting adjustment process in cooperation with the angle adjustment and the effective number of turns.

In order to achieve the purpose, the invention provides the following technical scheme:

a multifunctional adjusting method of a revolving chair chassis is characterized by comprising the following steps:

step one, an unlocking procedure, namely rotating a first adjusting rod to enable a lock rod to be separated from a gear hole, and at the moment, driving an adjusting plate to rotate around a main pin shaft by a backrest mounting plate;

step two, an elasticity adjusting process, which comprises the following steps:

a) the included angle is adjusted, the included angle of the first spring relative to the second spring is adjusted through rotating the handle, so that the resultant force of the first spring and the second spring is adjusted, and the elastic restoring force of the backrest mounting plate is adjusted;

b) the number of effective turns is adjusted, and at the same time when the angle between the first spring and the second spring is changed, the separators in the first number of turns adjusting unit and the second number of turns adjusting unit are driven by the rotating rod to rotate, and the separators change the number of effective turns of the first spring and the second spring so as to change the elastic force of the first spring and the second spring;

and step three, a lifting adjusting procedure, namely, a third adjusting rod is pulled to push the swinging piece to swing around the main pin shaft, and the swinging piece is used for controlling the lifting of the shell.

The invention has the beneficial effects that:

(1) according to the invention, the included angle between the first spring and the second spring is rapidly adjusted through the adjusting assembly, and meanwhile, the adjusting methods of the unlocking process, the elastic adjusting process and the lifting adjusting process are matched with included angle adjustment and effective circle number adjustment, so that the elastic force of the elastic assembly acting on the backrest mounting plate is quickly adjusted, and the elastic force is large;

(2) according to the invention, the moving piece B arranged on the second spring is matched with the moving piece A to synchronously move, so that the first spring and the second spring can simultaneously change the angle, and the adjustment can be further carried out quickly;

(3) the effective number of turns of the first spring is adjusted by arranging the number-of-turns adjusting unit in the first spring, so that the elasticity of the first spring is increased;

(4) the invention adjusts the effective number of turns of the second spring by arranging the turn number adjusting unit in the second spring so as to adjust the elastic force of the second spring, and further adjusts the elastic force of the elastic component on the backrest mounting plate by matching with the first spring.

In conclusion, the adjustable swivel chair has the advantages of being fast in adjustment, large in elastic force, high in reliability and the like, and is particularly suitable for the technical field of swivel chairs.

Drawings

FIG. 1 is a schematic view of the overall axis of the present invention.

FIG. 2 is a schematic diagram of the internal structure of the present invention.

FIG. 3 is a front cross-sectional view of the present invention.

Fig. 4 is a schematic view of embodiment 2 of the present invention.

Fig. 5 is a schematic view of embodiment 3 of the present invention.

Fig. 6 is a second schematic view of embodiment 3 of the present invention.

FIG. 7 is a schematic view of embodiment 4 of the present invention.

FIG. 8 is a schematic view of embodiment 5 of the present invention.

FIG. 9 is a process flow diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Example 1:

as shown in fig. 1 to 3, a multifunctional adjusting device for a revolving chair chassis comprises a shell 1 and a backrest mounting plate 2, the backrest mounting plate 2 is hinged on the shell 1 through a main pin shaft 21, a jacking shaft 22 parallel to the main pin shaft 21 is arranged on the backrest mounting plate 2, an elastic component 4, an adjusting component 5 and a pushing block 6 are arranged in the shell 1, the elastic component 4 comprises a first spring 41 and a second spring 42, one end of the first spring 41 and one end of the second spring 42 are abutted on the adjusting component 5 together, the adjusting component 5 adjusts an included angle between the first spring 41 and the second spring 42, the other end of the first spring 41 and the other end of the second spring 42 are hinged on one side of the pushing block 6 together, and the pushing block 6 is sleeved on the jacking shaft 22.

Further, still include angle adjusting part 3, angle adjusting part 3 includes:

the adjusting plate 31 is sleeved on the main pin shaft 21 and the jacking shaft 22, the adjusting plate 31 swings around the main pin shaft 21 along with the backrest mounting plate 2, a plurality of gear holes 311 are formed in the free swinging end of the adjusting plate 31, and locking holes 11 are formed in the shell 1 corresponding to the gear holes 311;

the lock rod 32 is arranged on the shell 1 in a sliding manner along the axis of the locking hole 11, and the lock rod 32 can be inserted into the gear hole 311 in a matching manner to lock the adjusting plate 31; and

the first adjusting rod 33 is arranged outside the shell 1, and the first adjusting rod 33 penetrates through the side wall of the shell 1 to be in transmission connection with the locking rod 32.

It should be noted that, the backrest mounting plate 2 is connected with the adjusting plate 31 as a whole through the main pin 21 and the jacking shaft 22, and after the locking lever 32 unlocks the adjusting plate 31, a person on the seat leans the backrest mounting plate 2 backwards so that the adjusting plate 31 freely rotates around the main pin 21.

Further, the adjusting assembly 5 includes:

a rotating handle 51, wherein the rotating handle 51 penetrates into the inner cavity of the shell 1 from the outside of the shell 1 and freely rotates relative to the shell 1;

a first set of transmission teeth 52, said first set of transmission teeth 52 being arranged at the transmission end of said rotary handle 51;

the screw 53 is arranged in the shell 1 along the vertical direction, and the first transmission tooth group 52 transmits the screw 53 to rotate; and

the moving member a54, the moving member a54 is sleeved on the screw 53, the screw 53 rotates forward and backward to drive the moving member a54 to reciprocate up and down, and the moving member a54 hinges and drives the first spring 41 to change an included angle of the first spring 41 relative to the second spring 42.

It should be noted that the angle between the first spring 41 and the second spring 42 changes, so that the resultant force acting on the backrest mounting plate 2 changes, thereby achieving the elastic force adjustment of the backrest mounting plate 2.

Further, still include lift and dial subassembly 8, lift and dial subassembly 8 includes:

the third adjusting rod 81 is sleeved on the second adjusting rod 721, and the third adjusting rod 81 extends into the inner cavity of the shell 1 and is integrally connected with the top plate 82; and

the swinging piece 83 is sleeved on the main pin shaft 21, and the top plate 82 drives the swinging piece 83 to swing around the main pin shaft 21 in an abutting mode.

Example 2:

for the sake of simplicity, only the points of difference of embodiment 2 from embodiment 1 are described below; this example 2 differs from example 1 in that:

as shown in fig. 4, in this embodiment, the spring further includes a moving member B55, the moving member B55 is sleeved on the screw 53, the screw 53 rotates forward and backward to drive the moving member B55 to reciprocate up and down, and the moving member B55 hinges and drives the second spring 42 to change an included angle of the second spring 42 relative to the first spring 41.

Further, one end of the screw 53 is provided with a right-handed thread, and the other end thereof is provided with a left-handed thread.

Specifically, the moving member B55 cooperates with the moving member a54 to quickly adjust the included angle of the second spring 42 relative to the first spring 41, so that the elastic force applied to the backrest mounting plate 2 is larger and the adjustment is faster.

Example 3:

for the sake of simplicity, only the points of difference of embodiment 3 from embodiment 1 or embodiment 2 are described below; this embodiment 3 differs from embodiment 1 or embodiment 2 in that:

as shown in fig. 5 and 6, in this embodiment, the first coil number adjusting unit 56 is further included, the first coil number adjusting unit 56 is disposed at an end of the first spring 41 to adjust an elastic force of the first spring 41, the first coil number adjusting unit 56 includes a connecting member 561, a rotary driving wheel a562, a rotary rod 563, and a partition 564, the connecting member 561 is connected to the first spring 41 and the moving member a54, the rotary rod 563 is rotatably disposed in the connecting member 561, a rack 12 is disposed on an inner wall of the housing 1, the rotary driving wheel a562 is in meshing transmission with the rack 12, the rotary driving wheel a562 drives the rotary rod 563 to rotate, the partition 564 is disposed at an end of the rotary rod 563, and the partition 564 is inserted into a gap of the first spring 41 to adjust an effective coil number of the first spring 41.

It should be noted that the elastic coefficient of the spring is related to the diameter of the spring, the wire diameter of the spring, the material of the spring, and the effective number of turns of the spring. The specific relationship is as follows: inversely proportional to the diameter of the coils, directly proportional to the 4 th power of the wire diameter of the spring, directly proportional to the modulus of elasticity of the material of the spring, and inversely proportional to the number of active turns of the spring. While the moving member a54 drives the first spring 41 to move, the rotary driving wheel a562 drives the divider 564 to rotate through the rotary rod 563 to change the effective number of turns of the first spring 41, further adjusting the elastic force.

Example 4:

for the sake of simplicity, only the points of difference of example 4 from example 1 or example 2 or example 3 are described below; this embodiment 4 differs from embodiment 1 or embodiment 2 or embodiment 3 in that:

as shown in fig. 7, in this embodiment, the winding number adjusting unit two 57 is further included, the winding number adjusting unit two 57 is disposed at an end of the second spring 42 to adjust the elastic force of the second spring 42, the winding number adjusting unit two 57 includes a rotating driving wheel b571, the rotating driving wheel b571 is a conical gear, and a bevel gear 531 in meshing transmission with the rotating driving wheel b571 is disposed at the top of the screw 53.

It should be noted that the second coil-number adjusting unit 57 further includes a connecting member 561, a rotating rod 563, and a partition 564, the connecting member 561 connects the second spring 42 and the moving member B55, the rotating rod 563 is rotatably disposed in the connecting member 561, the rotating driving wheel B571 is in meshing transmission with the bevel gear 531, the rotating driving wheel B571 drives the rotating rod 563 to rotate, the partition 564 is disposed at an end of the rotating rod 563, and the partition 564 is inserted into a gap of the second spring 42 to adjust an effective coil number of the second spring 42.

Example 5:

for the sake of simplicity, only the points of difference between embodiment 5 and embodiment 3 are described below; this example 5 differs from example 3 in that:

as shown in fig. 8, in the present embodiment, the end of the second spring 42 is also provided with a set of the turn number adjusting unit one 56.

It should be noted that, two sets of the first coil-number adjusting units 56 are both meshed with the driving wheel a562 by the rack 12, and the effective coil numbers of the springs are adjusted by the separating pieces 564 in synchronization during the process of adjusting the included angle between the second spring 42 and the first spring 41, and the structure is simple and reliable.

Example 6:

as shown in fig. 9, a multifunctional adjusting method of a revolving chair chassis is characterized by comprising the following steps:

step one, an unlocking procedure, namely rotating the first adjusting rod 33 to enable the locking rod 32 to be separated from the gear hole 311, and at the moment, the adjusting plate 31 can be driven by the backrest mounting plate 2 to rotate around the main pin shaft 21;

step two, an elasticity adjusting process, which comprises the following steps:

c) the included angle is adjusted, the included angle of the first spring 41 relative to the second spring 42 is adjusted by rotating the handle 51, so that the resultant force of the first spring 41 and the second spring 42 is adjusted, and the elastic restoring force of the backrest mounting plate 2 is adjusted;

d) effective turn number adjustment, in which the number of turns of the first spring 41 and the second spring 42 is changed while the angle between the first spring 41 and the second spring 42 is changed, the spacer 564 in the first turn number adjustment unit 56 and the second turn number adjustment unit 57 is rotated by the rotating rod 563, and the spacer 564 changes the effective turn number of the first spring 41 and the second spring 42 to change the elastic force thereof;

and step three, a lifting adjusting process, namely, a third adjusting rod 81 is pulled to push the swinging piece 83 to swing around the main pin shaft 21, and the swinging piece 83 is used for controlling the lifting of the shell 1.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.