CN107625324B

CN107625324B - Office chair chassis and office chair

Info

Publication number: CN107625324B
Application number: CN201610596293.3A
Authority: CN
Inventors: 何基
Original assignee: UE Furniture Co Ltd
Current assignee: UE Furniture Co Ltd
Priority date: 2016-07-18
Filing date: 2016-07-18
Publication date: 2024-04-12
Anticipated expiration: 2036-07-18
Also published as: CN107625324A

Abstract

The invention discloses an office chair chassis and an office chair, the office chair chassis comprises a base, a bracket and a rocker, the bracket is arranged in the base, the rocker is arranged in the bracket, a first pin shaft penetrates through the middle of the rocker and takes the first pin shaft as a rotating fulcrum, the first pin shaft penetrates through the bracket and is connected with the base, waist slots are symmetrically formed in two sides of the front end of the rocker, a second pin shaft penetrates through the waist slots and is connected with the bracket, track slots matched with the first pin shaft are symmetrically formed in two sides of the bracket, the first pin shaft penetrates through the track slots, and the chassis further comprises an elastic reset device which enables the bracket to recover to the original position after the rocker prizes the bracket; the office chair is provided with the chassis; the office chair with the chassis enables people with light weight or heavy weight to easily lean up and recover to get up; meanwhile, the chassis structure is simplified, the components are few, the installation is convenient, the installation efficiency is high, and the cost is low.

Description

Office chair chassis and office chair

Technical Field

The invention relates to the technical field of swivel chairs and office chairs, in particular to an office chair chassis.

Background

The office chair chassis, also called swivel chair chassis or swivel chair tray, is an important part arranged below the swivel chair or office chair seat cushion, and the lifting of the seat cushion and the adjustment of the tilting angle of the backrest are all completed by the chassis.

The prior swivel chair chassis is generally composed of an upper tray, a lower joist, a rotating shaft, a spring device and other parts, and after the upper turntable is fixed with the back of a swivel chair seat, the swivel chair can tilt properly around the rotating shaft and can actively return, so that a user has comfort. For example, chinese patent discloses a tray (patent number: 02287885.8), mainly comprising a bottom plate, a movable seat, a conical tube and an adjusting device, wherein the movable seat is movably connected with the bottom plate, the conical tube of an air pressure rod is connected in the middle of the movable seat, and the conical tube are welded together on the movable seat; the adjusting device comprises an adjusting rod, an adjusting plate, a torsion spring a and a torsion spring a fixing plate, wherein the adjusting rod is inserted into the movable seat, the adjusting plate is fixedly connected to one end of the adjusting rod inserted into the movable seat, one surface of the adjusting plate is in contact with the air pressure rod, and the other surface of the adjusting plate is connected with the torsion spring a; the other surface of the adjusting plate is provided with an adjusting plate rotation stopping sheet.

The adjusting device of the swivel chair tray is adjusted by the torsion spring completely, and for people with different weights, the force of the torsion spring is required to be different, so that the product has no good universality. To this problem, the patent number is: the Chinese patent of 201410479142.0 discloses a swivel chair chassis, which comprises a base, a bracket and a rocker, wherein the bracket is arranged in the base, the rocker is arranged in the bracket, the rocker uses a first pin shaft as a rotating pivot, the first pin shaft penetrates through the bracket and is connected with the base, the front part of the rocker is used for prying the bracket through a first connecting rod and a second connecting rod, the first connecting rod is hinged with the second connecting rod through a third pin shaft and is connected with the bracket through the third pin shaft, the second connecting rod penetrates through the second pin shaft and penetrates through or avoids the bracket and then is connected with the base, track grooves are symmetrically formed in two sides of the bracket, the first pin shaft penetrates through the track grooves, and the chassis further comprises an elastic reset device which enables the bracket to recover to the original position after the rocker moves the bracket.

The first pin shaft, the second pin shaft, the third pin shaft, the fourth pin shaft, the wane, the first connecting rod and the second connecting rod of the chassis form a four-point connecting rod mechanism to form force transmission, the chair back is connected and fixed on the wane to serve as driving force of the four-point connecting rod mechanism, gravity applied to the chair seat by a human body forms restoring force applied to the four-point connecting rod mechanism through the third pin shaft hinged to the bracket, and the driving force and the restoring force of the four-point connecting rod mechanism form an opposing relation.

In the backward tilting process of the human body, the acute angle included angle between the second connecting rod of the four-point connecting rod mechanism and the horizontal line is gradually reduced, so that the component force of the rotating force applied to the second connecting rod by the bracket is increased, the gradual increase of the gravity loading restoring force moment of the four-connecting rod mechanism is realized, the restoring force moment is opposed to the gradual increase driving force, the restoring force is less in dependence on the elastic restoring force of the elastic restoring device, the applicable crowd range is wider, and people with lighter weight or heavier weight can tilt and recover to get up easily.

However, the chassis has the defects of more parts, inconvenient installation and higher cost, so that a chassis with simpler structure is needed to realize the same function.

Disclosure of Invention

The invention overcomes the defects in the prior art, and provides the office chair chassis which has simpler structure, fewer parts, convenient installation and low cost and can be used by people with different weights, and the chassis not only solves the uncomfortable feeling caused by the offset of the lumbar support position when the backrest of the previous chair is tilted, thereby improving the comfort level; in addition, in the process of tilting the chair back, the ratio of the gravity loaded on the chair seat to the restoring force of the chair back is gradually increased, and the reasonable restoring force of the chair back is always provided in the whole process, so that people with lighter weight or heavier weight can tilt and restore to rise easily.

The technical scheme of the invention is realized as follows:

the utility model provides an office chair chassis, the on-line screen storage device comprises a base, be used for the bracket of fixed seat support and be used for connecting the wane of back of the chair, the bracket sets up in the base, the wane sets up in the bracket, first round pin axle and wane are worn to first round pin axle as the rotation fulcrum in the middle part of the wane, first round pin axle passes the bracket and links to each other with the base, the waist groove has been seted up to wane front end bilateral symmetry, wear to be equipped with second round pin axle and link to each other with the bracket in the waist groove, set up with first round pin axle complex track groove in the bilateral symmetry of bracket, first round pin axle wears to establish in the track inslot, this chassis still includes and makes the bracket can resume the elasticity resetting means of normal position after the wane prizing the bracket motion.

Preferably, control connecting rods are symmetrically arranged on two sides of the front part of the seesaw, one end of each control connecting rod is rotationally connected with the second pin shaft, and the other end of each control connecting rod is rotationally connected with the base through the third pin shaft. The control connecting rod can standardize the movement track of the bracket, so that the movement track of the bracket is regularly determined, and no running disorder or shake can occur.

Preferably, the first pin shaft is an integral long shaft, and two ends of the first pin shaft respectively pass through the rocker and the track groove in sequence and then are connected with the base. Thus, the rocker can be ensured to provide enough strength, and the rocker can rotate freely.

Preferably, the first pin shaft is two independent short shafts, two brackets are correspondingly and fixedly arranged on the base, one end of each short shaft sequentially penetrates through the rocker and the track groove and then is connected with the base, and the other end of each short shaft is inserted into the corresponding bracket. The structure is adopted, so that the inside of the base is simpler, and the first pin shaft is supported by the bracket, so that the strength requirement is met.

Preferably, the second pin shaft is a whole long shaft, and two ends of the second pin shaft respectively penetrate through the waist grooves and then are connected with the bracket. This also ensures that it provides sufficient strength to enable the second pin to pull up the bracket.

Preferably, the first pin is connected with the base by: the two sides of the rear end of the base are symmetrically provided with first shaft holes, and the first pin shafts are inserted into the first shaft holes.

Preferably, the second pin is connected with the bracket: second shaft holes are symmetrically formed in two sides of the front end of the bracket, and the second pin shafts are inserted into the second shaft holes.

Preferably, the base comprises a bottom plate for connecting the air rod, wherein the left side and the right side of the bottom plate are respectively provided with a supporting plate along the vertical direction, the supporting plates are fixedly connected with the bottom plate, and the first pin shaft is connected with the supporting plates of the base; the bracket comprises a supporting plate used for connecting the chair seat, and the two sides of the supporting plate are downwards extended to form a matching part matched with the first pin shaft and the second pin shaft. The bracket is wrapped in the base, so that the structure is reasonable, and the whole bracket is more attractive.

In order to enable the bracket to always move in the oblique upward direction, preferably, the track groove from bottom to top is obliquely arranged in the direction approaching to the rocker, and the waist groove from bottom to top is obliquely arranged in the direction separating from the rocker. In the backward tilting process of the human body, the back of the human body applies driving force to the backrest connected to the rocker, the rocker rotates to pry the second pin shaft to move, and meanwhile, the waist groove plays a role of avoiding the second pin shaft, so that the second pin shaft can pull the bracket to move upwards, the component force of the rotating force applied to the second pin shaft by the bracket is increased, the gradual increase of the restoring force moment of the rocker due to gravity loading is realized, the restoring force is opposite to the driving force gradually increased along with tilting of the backrest, the elastic restoring force dependence of the restoring force on the elastic restoring device is small, and the device is suitable for the needs of different fat and thin people.

Preferably, the bracket is connected with an elastic resetting device, the elastic resetting device is a spring, one end of the spring is connected with the bracket, and the other end of the spring is connected with the base. The spring is used for providing restoring force for the recovery of the seesaw and the bracket, and the device is simple and effective.

Preferably, the elastic reset device is a torsion spring, the torsion spring is sleeved on the first pin shaft, one torsion arm of the torsion spring is propped against the base, and the other torsion arm of the torsion spring rotates synchronously with the rocker. When the rocker is pried, one torsion arm of the torsion spring is kept motionless, and the other torsion arm of the torsion spring moves along with the rocker so that the distance between the two torsion arms is reduced, and therefore elastic force for resetting the rocker is generated.

Preferably, the seesaw comprises two side plates which are parallel at intervals and a connecting plate which is connected with the two side plates and is used for connecting the chair back, the connecting plate is positioned outside the base, a baffle is arranged on the bottom surface of the base, a cross rod is connected between the two side plates, one torsion arm of the torsion spring is abutted against the baffle, and the other torsion arm of the torsion spring is abutted against the cross rod. The setting of horizontal pole makes the convenience cooperate with the torsional spring, can also increase the intensity of bracket in addition, makes it more firm.

In order to realize the locking of the chair back at a certain position, as the preference, the chassis is also provided with a chair back wane locking mechanism, the chair back wane locking mechanism comprises a locking plate, a bolt and a bolt seat, a row of lock holes are formed in the locking plate, the locking plate synchronously rotates along with the wane, the bolt seat is positioned beside the locking plate and fixedly connected with the base, the bolt is inserted on the bolt seat in a sliding manner and matched with the lock holes, the bolt is connected with an elastic wire which generates elastic force when the form is changed, the elastic force of the elastic wire enables the bolt to be automatically inserted into the corresponding lock hole, and the elastic wire is connected with a driving device for driving the elastic wire. By means of the locking mechanism, the chair back can be fixed at a position which is comfortable for a certain user.

Preferably, the driving device comprises an adjusting rod horizontally inserted into the base, a sleeve is axially and fixedly sleeved on the adjusting rod, one end of the elastic wire is clamped on the sleeve, and the other end of the elastic wire is connected with the bolt. The adjusting rod is an adjusting rod for controlling the air rod to lift, the same adjusting rod is adopted to realize the locking and unlocking actions of the bolt, the structure is simple and ingenious, and the use is convenient; when the adjusting rod is stressed to move along the inserting direction of the bolt, the elastic wire is changed into an inclined state to generate elastic force, the bolt is kept to be inserted into the lock hole under the action of the elastic force, and when the locking plate rotates along with the rocker until the lock hole is aligned with the bolt, the bolt is inserted into the corresponding lock hole under the action of the elastic force; the bolt is prevented from being inserted into the lock hole more difficultly due to the fact that the elastic reset device is larger when the bolt moves synchronously with the adjusting rod.

Preferably, the sleeve is provided with a waist hole arranged along the circumferential direction of the sleeve, and a screw connected with the adjusting rod is arranged in the waist hole. The screw is fixed the external member axial direction on adjusting the pole, and waist hole plays the effect of dodging the screw when adjusting the pole rotation and adjusting the pole simultaneously.

Preferably, the elastic wire is provided with an extension section, the free end of the extension section is bent to form a hook, a straight hole is formed in the bolt seat along the moving direction of the bolt, the hook is inserted into the straight hole, and the stroke of the hook is limited by two ends of the straight hole. Therefore, the travel of the bolt can be limited, and the bolt is prevented from being separated from the bolt seat.

Preferably, the seesaw comprises two side plates which are parallel at intervals and a connecting plate which is connected with the two side plates and is used for connecting the chair back, a cross rod is connected between the two side plates, two ends of the locking plate are respectively sleeved on the cross rod and the first pin shaft, and the locking hole is arranged at a position close to the cross rod.

In order to facilitate the bolt to be smoothly inserted into the lock hole, the diameter of the lock hole is preferably larger than the diameter of the bolt.

Preferably, the locking plate is located at or near the middle of the first pin shaft. Therefore, the rocker locking stress position is transferred to the middle of the chassis, and can be controlled by only matching one bolt with one locking plate, so that the accuracy of alignment of the plugging position is convenient, and the overall stress is more uniform.

Preferably, a plastic sleeve is sleeved on the cross rod, the plastic sleeve is cut off at the position where the plastic sleeve is intersected with the locking plate, so that a notch is formed, and the locking plate is just clamped in the notch. The existence of the plastic sleeve can not only prevent the torsion spring from making sound in direct contact with the cross rod, but also play a role in clamping the locking plate, thereby achieving two purposes.

Preferably, the locking plate is welded and fixed with the cross bar. Thereby, the locking plate is prevented from moving in the direction of the axis of the cross bar.

An office chair comprises a chair back, a chair seat and an office chair chassis as described above, wherein the chair back is connected with a wane, and the chair seat is connected with a bracket.

Preferably, the air bar is connected with the base of the office chair chassis.

The design starting point, the idea and the beneficial effects of the invention adopting the technical scheme are as follows:

the invention provides the gravity self-adaptive office chair chassis which is free from manual adjustment, more humanized and better in universality, and the office chair or swivel chair provided with the chassis has the advantages that the backrest leaning and leaning restoring force is correspondingly matched according to the weight of a human body, so that people with light weight or heavy weight can lean and lean easily to recover to get up.

Specifically, the rocker acts on the bracket directly, the chair back is connected and fixed on the rocker to serve as driving force of the rocker and the bracket, gravity applied to the chair seat by a human body forms restoring force applied to the bracket through the second pin shaft hinged to the bracket, and the driving force and the restoring force of the bracket form an opposing relation; specifically, a second pin shaft connected to the bracket is arranged at the front end of the rocker, the second pin shaft is inserted into a waist groove formed in the front end of the rocker, the rocker drives the second pin shaft through the waist groove when rotating so as to lift the bracket, and the second pin shaft slides in the waist groove; compared with the prior four-bar mechanism, the invention simplifies the chassis structure, has fewer parts, convenient installation, high installation efficiency and low cost.

Meanwhile, the first pin shaft is used as a rotating fulcrum of the rocker and also used as an installation bearing part of the torsion spring of the elastic reset device, so that the space layout is more compact, and the space is saved; the cross rod is matched with the torsion spring to drive the torsion spring to deform, and meanwhile, the cross rod is matched with the first pin shaft to install and fix the locking plate, so that each part has multiple purposes, space is saved to the maximum, parts are reduced, and installation structure is simplified.

In the backward tilting process of the human body, the ratio of the gravity loaded on the chair seat to the restoring force of the chair back is gradually increased, and the reasonable restoring force of the chair back is always provided in the whole process, so that people with lighter weight or heavier weight can tilt and restore to rise easily.

Furthermore, in the process of backward leaning of a person, the chair seat also moves backward along with the rotation of the chair back, so that the lumbar support of the backrest always fits with the corresponding position of the human back, the lumbar suspension caused by the separation of the lumbar support of the backrest from the lumbar of the human body is avoided, and the friction between clothes and the chair back is also avoided.

Drawings

FIG. 1 is a schematic view of the internal perspective structure of a chassis according to the present invention in an embodiment;

FIG. 2 is a schematic plan view of the structure of FIG. 1;

FIG. 3 is a schematic view of an internal perspective structure of another angle of the chassis according to the present invention;

FIG. 4 is a schematic view of a disassembled structure of the chassis of the present invention;

FIG. 5 is a schematic view of a split structure of another angle of the chassis in an embodiment;

FIG. 6 is a schematic view of an internal perspective structure of another form of chassis according to the present invention;

fig. 7 is a schematic perspective view of a rocker in an embodiment;

fig. 8 is a schematic view illustrating a state in which a rocker is engaged with a base in the embodiment;

FIG. 9 is an exploded view of the present invention in an embodiment;

FIG. 10 is an exploded view of another aspect of the present invention in an embodiment;

FIG. 11 is a schematic plan view of the chassis in an initial state;

fig. 12 is a schematic perspective view of the chassis in an initial state;

FIG. 13 is a schematic plan view of the chassis in an operative condition;

fig. 14 is a schematic perspective view of the chassis in an operative state;

FIG. 15 is a schematic view of the chassis mounted on the air bars;

FIG. 16 is a schematic view of the configuration of the elastic wire in cooperation with the locking plate;

FIG. 17 is a schematic view of another angle of engagement of the elastic wire with the locking plate;

FIG. 18 is a schematic view of the mating structure of the spring wire extension and the latch base;

FIG. 19 is a schematic view of the latch of the seat back rocker locking mechanism in a locked state;

fig. 20 is a schematic view of the latch of the seat back rocker locking mechanism in an unlocked state.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

The specific embodiments of the present invention are as follows:

examples: the invention firstly defines the reference orientation of each component, when the chassis and the office chair are normally installed and used, the front of the office chair is the front end, the rear of the office chair comprises the back which is the rear end, the front end of the chassis is the area far away from the seesaw, and the rear end of the chassis is the area close to the seesaw.

An office chair chassis, which can also be called a swivel chair chassis, as shown in fig. 1-10, comprises a base 1 for connecting an air bar, a bracket 2 for fixing a chair seat and a rocker 3 for connecting a chair back, wherein the bracket 2 is arranged in the base 1, and the rocker 3 is arranged in the bracket 2; specifically, the base 1 includes a bottom plate 4 for connecting an air bar, a supporting plate 5 is respectively arranged on the left side and the right side of the bottom plate 4 along the vertical direction, the supporting plate 5 is fixedly connected with the bottom plate 4, and the bottom plate 4 has supporting effect on the whole chassis, the chair seat and the chair back.

As shown in fig. 4 and 5, the rear ends of the supporting plates 5 at two sides of the base 1 are symmetrically provided with first shaft holes 9, a first pin 11 penetrates through the middle of the rocker 3, the rocker 3 takes the first pin 11 as a rotating fulcrum, and the first pin 11 penetrates through the bracket 2 and is connected with the base 1; specifically, the two sides of the bracket 2 are symmetrically provided with the track grooves 32 matched with the first pin shafts 11, the first pin shafts 11 are arranged in the track grooves 32 in a penetrating manner, the first pin shafts 11 are whole long shafts, and two ends of the first pin shafts 11 respectively pass through the rocker 3 and the track grooves 32 in sequence and then are inserted into the first shaft holes 9. In order to maintain the overall beauty, the front end of the base 1 is provided with a shield 33.

Waist slots 6 are symmetrically formed in two sides of the front end of the seesaw 3, a second pin shaft 8 is arranged in the waist slots 6 in a penetrating mode, and the second pin shaft 8 is connected with the bracket 2; specifically, the two sides of the front end of the bracket 2 are symmetrically provided with second shaft holes 10, the second pin shaft 8 is a whole long shaft, and two ends of the second pin shaft 8 respectively pass through the waist groove 6 and are inserted into the second shaft holes 10.

The bracket 2 comprises a supporting plate 7 for connecting a chair seat, and two sides of the supporting plate 7 are downwards extended with a matching part 12 matched with the first pin shaft 11 and the second pin shaft 8.

In order to standardize the movement track of the bracket, the movement track of the bracket is regularly determined, so that no running disorder or shake occurs; control connecting rods 30 are symmetrically arranged on two sides of the front portion of the rocker 3, one end of each control connecting rod 30 is rotatably connected with the corresponding second pin shaft 8, and the other end of each control connecting rod 30 is rotatably connected with the base 1 through a third pin shaft 31.

The rail groove 32 is inclined toward the direction approaching the rocker 3 from bottom to top, and the waist groove 6 is inclined toward the direction separating from the rocker 3 from bottom to top.

The chassis also comprises an elastic reset device which enables the bracket to restore to the original position after the rocker 3 prizes the bracket 2 to move; in this embodiment, the elastic restoring device is a torsion spring 12, the torsion spring 12 is sleeved on the first pin shaft 11, one torsion arm 121 of the torsion spring 12 abuts against the base 1, and the other torsion arm 122 of the torsion spring 12 rotates synchronously with the rocker 3; specifically, as shown in fig. 5, 7 and 8, the rocker 3 includes two parallel side plates 13 and a connecting plate 14 connecting the two side plates 13 and connecting the backrest, the connecting plate 14 is located outside the base 1, the waist slot 6 is opened on the side plates 13, a baffle 15 is disposed on the bottom surface of the base 1, a cross bar 15 is connected between the two side plates 13, one torsion arm 121 of the torsion spring 12 abuts against the baffle 15, and the other torsion arm 122 of the torsion spring 12 abuts against the cross bar 15.

When the chair back or the seesaw 3 tilts to the maximum angle, the distance of the backward movement of the bracket 2 or the chair seat along with the chair back is 15-40 mm, and the optimal distance is 30mm; the backward tilting angle of the chair back is 10-30 degrees, and the optimal angle is 21 degrees.

When the invention is installed and used on a swivel chair, in an initial state, a person sits on the swivel chair, as shown in figures 11 and 12, and under the action of torsion of a torsion spring, a chair seat and the weight of the person, the supporting plate 7 is pressed on two supporting plates (not shown) of the base 1; when a person leans back on the chair back, as shown in fig. 13 and 14, the bracket 2 drives the chair seat to be linked, so that the chair seat also moves back along with the rotation of the chair back.

Further, as shown in fig. 15 to 20, in order to lock the chair back in a proper position, the chassis is further provided with a chair back rocker locking mechanism, the chair back rocker locking mechanism comprises a locking plate 16, a latch 17 and a latch seat 18, a row of lock holes 19 are arranged on the locking plate 16, the number of the lock holes 19 is more than 3, the locking plate 16 rotates synchronously with the rocker 3, the latch seat 18 is located beside the locking plate 16 and the latch seat 18 is fixedly connected with the base 1, the latch 17 is slidably inserted on the latch seat 18 and matched with the lock holes 19, the latch 17 is connected with an elastic wire 20 which generates elastic force when the shape changes, the elastic wire 20 is elastically inserted into the corresponding lock hole 19 automatically, and the elastic wire 20 is connected with a driving device for driving the elastic wire 20; the elastic wire 20 is a steel wire, and its initial state is a vertical state, and when it is dragged by the driving device, since the upper and lower ends of the elastic wire 20 are fixed, it is inclined and deformed, thereby generating elastic force.

As shown in fig. 16, 17 and 18, the driving device comprises an adjusting rod 21 horizontally inserted into the base 1, the adjusting rod 21 is used for simultaneously adjusting the air rods, a sleeve member 22 made of plastic is axially and fixedly sleeved on the adjusting rod 21, a clamping groove 34 is formed in the sleeve member 22, one end of the elastic wire 20 is clamped in the clamping groove 34 of the sleeve member 22, and the other end of the elastic wire 20 is connected with the bolt 17; the sleeve 22 is provided with a waist hole 23 arranged along the circumferential direction of the sleeve 22, and a screw 24 connected with the adjusting rod 21 is arranged in the waist hole 23, and the waist hole 23 plays a role in avoiding the screw 24, so that the adjusting rod 21 can freely rotate to adjust the lifting of the air rod.

Still further, the elastic wire 20 is provided with an extension section 25, the free end of the extension section 25 is bent to form a hook 26, a slot 27 is provided on the latch seat 18 along the moving direction of the latch, the hook 26 is inserted into the slot 27, and the stroke of the hook 26 is limited by two ends of the slot 27, so that the hook 26 cannot be separated from the latch seat 18.

The locking plate 16 is mounted by: the two ends of the locking plate 16 are respectively sleeved on the cross rod 15 and the first pin shaft 11, the plane of the locking plate 16 is perpendicular to the axis of the first pin shaft 11, and the locking hole 19 is arranged at a position close to the cross rod 15; the locking plate 16 is positioned at the middle part or the position close to the middle part of the first pin shaft 11; to facilitate insertion of the latch 17, the aperture of the latch hole 19 is larger than the diameter of the latch 17.

As shown in fig. 19, in order to avoid rattling of the metal contact, a plastic sleeve 28 is placed over the cross bar 15, the plastic sleeve 28 being truncated at the intersection with the locking plate 16 so as to form a notch 29, said locking plate 16 being just snapped into the notch 29.

When in an unlocked state, as shown in fig. 20, the latch 17 is separated from the latch hole 19, and at this time, a person sits on the seat and can lean against the seat back at any angle; when the locking plate 16 rotates to the corresponding lock hole to align with the bolt, the bolt is automatically inserted into the corresponding lock hole under the action of the buffer force to lock the locking plate, so that the rocker is not rotated any more.

In the description of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances or the specific explanation of the present invention.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or unit referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the terms "specific embodiment" and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An office chair chassis, characterized in that: including the base, be used for the bracket of fixed seat support and be used for connecting the wane of back of the chair, the bracket sets up in the base, the wane sets up in the bracket, the wane middle part has worn first round pin axle and wane and has used first round pin axle to rotate the fulcrum, first round pin axle passes the bracket and links to each other with the base, the waist groove has been seted up to wane front end bilateral symmetry, wear to be equipped with second round pin axle and second round pin axle links to each other with the bracket in the waist groove, the second round pin axle links to each other with the bracket and means: the two sides of the front end of the bracket are symmetrically provided with second shaft holes, the second pin shafts are inserted into the second shaft holes, the two sides of the bracket are symmetrically provided with track grooves matched with the first pin shafts, and the first pin shafts are penetrated in the track grooves; the chassis also comprises an elastic reset device which enables the bracket to restore to the original position after the rocker prizes the bracket to move, the bracket is connected with the elastic reset device, the elastic reset device is a spring, one end of the spring is connected with the bracket, and the other end of the spring is connected with the base; control connecting rods are symmetrically arranged on two sides of the front part of the seesaw, one end of each control connecting rod is rotationally connected with the second pin shaft, and the other end of each control connecting rod is rotationally connected with the base through the third pin shaft; the rail grooves from bottom to top are obliquely arranged towards the direction close to the rocker, and the waist grooves from bottom to top are obliquely arranged towards the direction far away from the rocker;

the chassis is also provided with a chair back rocker locking mechanism, the chair back rocker locking mechanism comprises a locking plate, a bolt and a bolt seat, a row of lock holes are formed in the locking plate, the locking plate synchronously rotates along with the rocker, the bolt seat is beside the locking plate and fixedly connected with the base, the bolt is inserted on the bolt seat in a sliding manner and matched with the lock holes, an elastic wire which generates elastic force when the form is changed is connected with the bolt, the elastic wire enables the bolt to be automatically inserted into the corresponding lock hole by the elastic force of the elastic wire, and a driving device for driving the elastic wire is connected with the elastic wire;

the driving device comprises an adjusting rod horizontally inserted into the base, a sleeve is axially and fixedly sleeved on the adjusting rod, one end of the elastic wire is clamped on the sleeve, and the other end of the elastic wire is connected with the bolt;

the rocker comprises two side plates which are parallel at intervals and a connecting plate which is connected with the two side plates and used for connecting a chair back, a cross rod is connected between the two side plates, two ends of the locking plate are respectively sleeved on the cross rod and the first pin shaft, and the locking hole is arranged at a position close to the cross rod.

2. An office chair chassis according to claim 1, wherein: the first pin shaft is a whole long shaft, and two ends of the first pin shaft respectively pass through the rocker and the track groove in sequence and then are connected with the base.

3. An office chair chassis according to claim 1, wherein: the first pin shaft is two independent short shafts, two brackets are correspondingly and fixedly arranged on the base, one end of each short shaft sequentially penetrates through the rocker and the track groove and then is connected with the base, and the other end of each short shaft is inserted into the corresponding bracket.

4. An office chair chassis according to claim 1, wherein: the second pin shaft is a whole long shaft, and two ends of the second pin shaft respectively penetrate through the waist grooves and then are connected with the bracket.

5. An office chair chassis according to claim 1, wherein: the first pin shaft is connected with the base and means that: the two sides of the rear end of the base are symmetrically provided with first shaft holes, and the first pin shafts are inserted into the first shaft holes.

6. An office chair chassis according to claim 1, wherein: the base comprises a bottom plate for connecting the air rod, the left side and the right side of the bottom plate are respectively provided with a supporting plate along the vertical direction, the supporting plates are fixedly connected with the bottom plate, and the first pin shaft is connected with the supporting plates of the base; the bracket comprises a supporting plate used for connecting the chair seat, and the two sides of the supporting plate are downwards extended to form a matching part matched with the first pin shaft and the second pin shaft.

7. An office chair chassis according to claim 1, wherein: the elastic reset device is a torsion spring, the torsion spring is sleeved on the first pin shaft, one torsion arm of the torsion spring is propped against the base, and the other torsion arm of the torsion spring and the rocker synchronously rotate.

8. An office chair chassis according to claim 7, wherein: the rocker comprises two side plates which are parallel at intervals and a connecting plate which is connected with the two side plates and is used for connecting a chair back, wherein the connecting plate is positioned outside the base, a baffle is arranged on the bottom surface of the base, a cross rod is connected between the two side plates, one torsion arm of the torsion spring is abutted against the baffle, and the other torsion arm of the torsion spring is abutted against the cross rod.

9. An office chair chassis according to claim 1, wherein: the sleeve is provided with a waist hole arranged along the circumferential direction of the sleeve, and a screw connected with the adjusting rod is arranged in the waist hole.

10. An office chair chassis according to claim 1, wherein: the elastic wire is provided with an extension section, the free end of the extension section is bent to form a hook, a straight hole is formed in the bolt seat along the moving direction of the bolt, the hook is inserted into the straight hole, and the stroke of the hook is limited by two ends of the straight hole.

11. An office chair chassis according to claim 1, wherein: the aperture of the lock hole is larger than the diameter of the bolt.

12. An office chair chassis according to claim 1, wherein: the locking plate is positioned at the middle part or the position close to the middle part of the first pin shaft.

13. An office chair chassis according to claim 1, wherein: the cross rod is sleeved with a plastic sleeve, the plastic sleeve is cut off at the position where the plastic sleeve is intersected with the locking plate, so that a notch is formed, and the locking plate is just clamped in the notch.

14. An office chair chassis according to claim 1, wherein: the locking plate is fixedly connected with the cross rod.

15. An office chair, characterized by: an office chair chassis comprising a back, a seat, and any of claims 1-14, the back being connected to the rocker, the seat being connected to the bracket.

16. An office chair according to claim 15, wherein: the air rod is connected with the base of the office chair chassis.