CN206603488U - Chair bottom and office chair - Google Patents

Abstract

The utility model discloses a kind of chair bottom and office chair, chair bottom, including base, bracket and seesaw, bracket is arranged in base, seesaw is arranged in bracket, the first bearing pin is installed with the middle part of seesaw and seesaw is using the first bearing pin as rotating fulcrum, first bearing pin is connected through bracket and with base, seesaw front end both sides symmetrically offer gain, the second bearing pin is equipped with gain and the second bearing pin is connected with bracket, the rail groove coordinated with the first bearing pin is symmetrically offered in the both sides of bracket, first bearing pin is located in rail groove, the chassis also includes enabling the elasticity reset device that bracket sets back after seesaw prizes movement of bracket；Additionally provide a kind of office chair for being provided with above-mentioned chassis；Equip the office chair on this chassis so that no matter the light or heavy people of body weight easily can stand up in reclining reply；Chassis structure is in turn simplify simultaneously, part is few, easy for installation, installation effectiveness is high and cost is low.

Description

Chair bottom and office chair

Technical field

The utility model is related to swivel chair, office chair technical field, more particularly to a kind of chair bottom.

Background technology

Chair bottom, also referred to as Revolving chair chassis or Revolving chair tray, are installed in a weight below swivel chair or office chair seat cushion Part is wanted, the lifting of seat cushion, the elevation angle regulation of backrest is all completed by chassis.

Current Revolving chair chassis is generally to be made up of parts such as top tray, lower joist, rotating shaft and spring assemblies, top rotary table After being fixed with swivel chair seat back, swivel chair can make appropriate reclining around the shaft, and can actively reply, and user is had comfort.Example Such as, Chinese patent discloses a kind of pallet (Patent No.：02287885.8), mainly including bottom plate, sliding seat, conical pipe and tune Regulating device, sliding seat is movably connected in bottom plate, the conical pipe of connection air pressure rod in the middle of sliding seat, by Taper Pipe fixed plate and cone Shape pipe is welded in sliding seat together；Described adjusting means includes adjusting rod, adjustable plate, torsion spring a, torsion spring a fixed plates, adjusts Pole is interspersed in sliding seat, and adjustable plate is fixedly connected on one end in adjusting rod insertion sliding seat, and the one side of adjustable plate connects Air pressure rod is touched, another side is connected with torsion spring a；Spin-ended of adjustable plate is provided with the another side of adjustable plate.

The adjusting means of above-mentioned Revolving chair tray is adjusted completely by torque spring, required for the different people of body weight The power needs for the torque spring wanted are different, product is not had good versatility.For this problem, Patent No.： The Chinese patent of " 201410479142.0 " discloses a kind of Revolving chair chassis, including base, bracket and seesaw, and bracket is arranged on bottom In seat, seesaw is arranged in bracket, and seesaw is using the first bearing pin as rotating fulcrum, and the first bearing pin is connected through bracket and with base, Seesaw is anterior to prize bracket by first connecting rod, second connecting rod, and first connecting rod and second connecting rod pass through the 3rd hinge and the Three bearing pins are connected with bracket, and second connecting rod is installed with the second bearing pin and the second bearing pin passes through or avoided after bracket to be connected with base, The both sides of bracket symmetrically offer rail groove, and the first bearing pin is located in rail groove, and the chassis is also included when seesaw prizes bracket The elasticity reset device for enabling bracket set back after motion.

First bearing pin, the second bearing pin, the 3rd bearing pin, the 4th bearing pin, seesaw, first connecting rod, the second connecting rod on above-mentioned chassis Four-point linkage mechanism is formed, the conduction of power is formed, the chair back is connected and fixed on seesaw as the driving force of four-point linkage mechanism, human body Put on the restoring force that threeth bearing pin formation of the gravity of seat support by being articulated with bracket is applied to four-point linkage mechanism, 4 points of companies Driving force and restoring force the formation Antagonistic Relationship of linkage.

During human body backward reclining, the second connecting rod of four-point linkage mechanism progressively subtracts with horizontal acute angle Small, then bracket puts on the revolving force component increase of second connecting rod, so as to realize reply of the gravitational load for quadric chain Force square is incrementally increased, and is resisted with the driving force formation that incrementally increases, restoring force to the elastic-restoring force of elasticity reset device according to Bad smaller, applicable crowd's scope is wider, and the lighter or heavier people of body weight easily can stand up in reclining and reply.

But above-mentioned chassis has the drawback that part is more, inconvenience is installed, cost is higher, therefore, it is necessary to develop one The more simple chassis of structure is planted to realize equal function.

Utility model content

The utility model overcome in the presence of above-mentioned prior art not enough there is provided a kind of structure is more simple, portion The chair bottom that the people for meeting different weight that part is few, easy for installation, cost is low uses, the chassis is not only solved in the past During the backrest reclining of seat, the discomfort that lumbar supporting position skew is brought, so as to improve comfort level；And incline in the chair back During facing upward, the gravity for loading on seat support is transmitted to the ratio of chair back restoring force and incrementally increased, and is provided all the time in whole process Rational backrest restoring force so that the lighter or heavier people of body weight easily can stand up in reclining and reply.

What the technical solution of the utility model was realized in：

A kind of chair bottom, including base, the bracket to fixed seat support and the seesaw to connect the chair back, bracket are set Put in base, seesaw is arranged in bracket, be installed with the first bearing pin in the middle part of seesaw and seesaw is using the first bearing pin as rotating fulcrum, the One bearing pin is connected through bracket and with base, and seesaw front end both sides symmetrically offer gain, and the second bearing pin is equipped with gain And second bearing pin be connected with bracket, the rail groove coordinated with the first bearing pin is symmetrically offered in the both sides of bracket, the first bearing pin wears It is located in rail groove, the chassis also includes the elastic reset dress for enabling bracket set back after seesaw prizes movement of bracket Put.

Preferably, the anterior both sides of seesaw are arranged with controls connecting rod, one end of controls connecting rod is rotated with the second bearing pin Connection, the other end of controls connecting rod is connected by the 3rd bearing pin with base rotation.Controls connecting rod can be with the motion rail of specification bracket Mark, determines movement of bracket path generation, will not run chaotically or shake.

Preferably, the first described bearing pin is one whole major axis, the two ends of the first bearing pin each sequentially pass through seesaw, rail It is connected after road groove with base.It can so ensure that it can provide enough intensity, enable seesaw to rotate freely.

Preferably, the first described bearing pin is two independent short axles, correspondence is fixed with two supports on base, One end of each short axle is connected after sequentially passing through seesaw, rail groove with base, and the other end of each short axle is inserted in corresponding support It is interior.Make chassis interior more succinct using such structure, and the first bearing pin is supported by support, meets wanting for intensity Ask.

Preferably, the second described bearing pin is one whole major axis, the two ends of the second bearing pin each pass through after gain with support Frame is connected.It equally can so ensure that it can provide enough intensity, enable the second bearing pin pull-up bracket.

Refer to preferably, the first bearing pin is connected with base：The first axis hole, first are arranged with the both sides of base rear end Bearing pin is plugged in the first axis hole.

Refer to preferably, the second bearing pin is connected with bracket：The second axis hole, second are arranged with the both sides of bracket front end Bearing pin is plugged in the second axis hole.

Preferably, described base includes the bottom plate to connect gas bar, in the left and right sides of bottom plate vertically A supporting plate is respectively provided with, supporting plate is fixedly linked with bottom plate, the first bearing pin is connected with the supporting plate of base；Described bracket bag Include to connect the supporting plate of seat support, supporting plate both sides extend downwardly the auxiliary section coordinated with first, second bearing pin.Base is by bracket It is coated on wherein, it is rational in infrastructure, it is overall more attractive in appearance.

In order to be able to allow bracket diagonally to go up direction motion all the time, preferably, described rail groove is towards from lower to upper It is obliquely installed close to the direction of seesaw, described gain is towards the direction away from seesaw and is obliquely installed from lower to upper.In human body Backward during reclining, human body back applies driving force to the backrest for being connected to seesaw, and seesaw rotates to prize the second bearing pin fortune It is dynamic, while gain plays a part of avoiding the second bearing pin, allow the second bearing pin to pull bracket to move upwards so that bracket applies Increase in the revolving force component of the second bearing pin, so as to realize that gravitational load is incrementally increased for the restoring force torque of seesaw, with The driving force formation confrontation that the reclining of backrest is incrementally increased, restoring force the elastic-restoring force of elasticity reset device is relied on compared with It is small, the need for being adapted to different fat or thin crowds.

Preferably, bracket connects elasticity reset device, described elasticity reset device is spring, one end of spring and support Frame is connected, and the other end of spring is connected with base.Restoring force is provided come the reply for seesaw and bracket by spring, it is simple to have again Effect.

Preferably, described elasticity reset device is torsion spring, torsion spring is set on the first bearing pin, a torque arm of torsion spring Offseted with base, another torque arm and the seesaw synchronous axial system of torsion spring.When seesaw is prized, a torque arm of torsion spring is kept not Dynamic, another torque arm of torsion spring is moved with seesaw causes spacing reduction between two torque arm, thus produces the bullet for resetting seesaw Power.

Preferably, described seesaw include two side plates of two spaced and parallel side plates and connection and to connect The connecting plate of the chair back, connecting plate is located at outside base, and baffle plate is provided with the bottom surface of base, horizontal stroke is connected between two side plates Bar a, torque arm of torsion spring offsets with baffle plate, and another torque arm and the cross bar of torsion spring offset.The setting of cross bar causes convenient with turning round Spring coordinates, and it can in addition contain increase the intensity of bracket, makes it more firm.

In order to realize locking of the chair back in a certain position, preferably, the chassis is additionally provided with chair back wane lock mechanism, Described chair back wane lock mechanism includes lockplate, latch and plug housing, and lockplate is provided with row's lockhole, and lockplate is with sticking up Plate synchronous axial system, plug housing is in by lockplate and plug housing is fixedly linked with base, latch slip be interspersed on plug housing and Coordinate with lockhole, latch is connected with the elastic yarn that elastic force is produced when form produces change, the elastic force of elastic yarn makes latch automatic Insert in corresponding lockhole, elastic yarn is connected with the drive device being driven to elastic yarn., can be by by above-mentioned locking mechanism The chair back is fixed on the position that some user feels comfortably cool.

Preferably, described drive device includes axial restraint set on the adjusting rod being horizontally inserted in base, adjusting rod Provided with sleeve piece, one end of elastic yarn is stuck in external member, the other end connecting bolt of elastic yarn.Adjusting rod is the bar lifting of control gas Adjusting rod, locking, the unlocking motion of latch are realized using same adjusting rod, structure is simplified and ingenious, easy to use；When Adjusting rod stress along latch direction of insertion move when, elastic yarn is changed into heeling condition and thus produce elastic force, latch is in elastic force The situation of lockhole is remained inserted under effect, when lockplate turns to lockhole with seesaw to be aligned with latch, work of the latch in elastic force With the corresponding lockhole of lower insertion；Avoid latch directly when being synchronized with the movement with adjusting rod because elasticity reset device power is larger so that The more difficult insertion lockhole of latch.

Preferably, external member is provided with the waist hole set along external member circumferential direction, it is provided with and is connected with adjusting rod in waist hole Screw.External member axial direction is fixed on adjusting rod by screw, is kept away while waist hole is played when adjusting rod rotates regulation gas bar Allow the effect of screw.

Preferably, described elastic yarn is provided with extension, the free end of extension is bent to form crotch, on plug housing Be provided with a word hole along latch moving direction, described crotch be plugged in a word hole and crotch stroke by a word hole two ends Limitation.It is possible thereby to limit the stroke of latch, prevent latch from departing from plug housing.

Preferably, described seesaw include two side plates of two spaced and parallel side plates and connection and to connect The connecting plate of the chair back, is connected with cross bar between two side plates, and the two ends of lockplate are respectively sleeved on cross bar and the first bearing pin, Lockhole is positioned close at the position of cross bar.

Latch is set smoothly to insert in lockhole for convenience, preferably, the aperture of lockhole is more than the diameter of latch.

Preferably, described lockplate is in the middle part of the first bearing pin or at the position at middle part.Thus, seesaw is locked Determine forced position to be transferred in the middle part of chassis, it is that can control only to match somebody with somebody a unification lockplate by a latch, not only facilitates grafting position Alignment accuracy is put, also causes overall stress evenly.

Preferably, be cased with plastic bushing on cross bar, plastic bushing with lockplate intersection location at be truncated so as to A breach is formed, described lockplate is stuck in breach just.The presence of plastic bushing can not only avoid torsion spring and cross bar Directly contact sends sound, and also acts the effect for blocking lockplate, kills two birds with one stone.

Preferably, described lockplate is welded and fixed with cross bar.It is possible thereby to avoid lockplate along cross bar axis direction Produce movement.

A kind of office chair, including the chair back, seat support and chair bottom as described above, the chair back are connected with seesaw, seat support It is connected with bracket.

Preferably, also including gas bar, described gas bar is connected with the base of chair bottom.

Employing design starting point of the present utility model, theory and the beneficial effect of above-mentioned technical proposal is：

The utility model provides one kind without adjust manually, and the more preferable gravity of more humane, versatility is adaptively handled official business Chair chassis, equips the office chair or swivel chair on this chassis, according to human body weight, and backrest reclining restoring force has corresponding matching so that nothing Easily reclining reply it can be stood up by the light or heavy people of body weight.

Specifically, seesaw of the present utility model directly acts on bracket, the chair back be connected and fixed on seesaw as seesaw and The driving force of bracket, human body puts on the reply that second bearing pin formation of the gravity of seat support by being articulated with bracket is applied to bracket Power, driving force and restoring force the formation Antagonistic Relationship of bracket；Specifically, the second pin for being connected to bracket is provided with seesaw front end Axle, the second bearing pin is plugged in the gain that seesaw front end is opened up, and drives the second bearing pin to lift by gain when seesaw is rotated Bracket, the second bearing pin produces sliding in gain；So the quadric chain before comparing, the utility model simplifies chassis knot Structure, part is few, easy for installation, installation effectiveness is high and cost is low.

Meanwhile, the first bearing pin is held as the installation of elasticity reset device torsion spring simultaneously both as the rotating fulcrum of seesaw Support portion, makes space layout more compact, saves space；Cross bar not only coordinates to be driven torsion spring with torsion spring deforms it, together When cross bar coordinate again with the first bearing pin installing fixing lock fixed board, each part has been played multiple purposes, maximize section About space, reduces parts, simplifies mounting structure.

During human body backward reclining, the gravity for loading on seat support is transmitted to the ratio of chair back restoring force and incrementally increased, Rational backrest restoring force is provided all the time in whole process so that the lighter or heavier people of body weight can easily reclining and return Stand up again.

Furthermore, people during leaning on backward, and seat support also follows the rotation of the chair back to be moved rearwards by, and backrest lumbar support is begun The correspondence position of laminating human body back eventually, it is to avoid backrest lumbar support departs from human body waist, and to produce waist hanging, it also avoid Clothing produces friction with backrest.

Brief description of the drawings

Fig. 1 is the inside dimensional structure diagram on the utility model chassis in embodiment；

Fig. 2 is Fig. 1 planar structure schematic diagram；

Fig. 3 is the inside dimensional structure diagram of another angle in the utility model chassis in embodiment；

Fig. 4 is the fractionation structural representation on the utility model chassis；

Fig. 5 is the fractionation structural representation of another angle in chassis in embodiment；

Fig. 6 is the another form of internal dimensional structure diagram in the utility model chassis in embodiment；

Fig. 7 is the dimensional structure diagram of seesaw in embodiment；

Fig. 8 is the view of seesaw and base engagement in embodiment；

Fig. 9 is explosive view of the present utility model in embodiment；

Figure 10 is the explosive view of another angle of the utility model in embodiment；

Figure 11 is the planar structure schematic diagram that chassis is under original state；

Figure 12 is the dimensional structure diagram that chassis is under original state；

Planar structure schematic diagrams of the Figure 13 for chassis under in running order；

Dimensional structure diagrams of the Figure 14 for chassis under in running order；

Figure 15 is schematic diagram of the chassis on gas bar；

Figure 16 is the structural representation that elastic yarn is engaged with lockplate；

Figure 17 is the structural representation for another angle that elastic yarn is engaged with lockplate；

Figure 18 is the fit structure schematic diagram of elastic yarn extension and plug housing；

The schematic diagram that Figure 19 is in the lock state for the latch of chair back wane lock mechanism；

Figure 20 is in the schematic diagram of unlocked state for the latch of chair back wane lock mechanism.

Embodiment

In order to be more clearly understood that above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the accompanying drawings and tool The utility model is further described in detail body embodiment.It should be noted that in the case where not conflicting, this Shen The feature in embodiment and embodiment please can be mutually combined.

Many details are elaborated in the following description in order to fully understand the utility model, still, the present invention Other modes described here can also be different from using other to implement, therefore, protection domain of the present utility model not by The limitation of following public specific embodiment.

Embodiment of the present utility model is as follows：

Embodiment：The reference azimuth of each part of the utility model is defined first, and the utility model exists chassis and office chair Normal mounting is in use, the front of office chair is front end, and the position where the rear of office chair includes backrest is rear end, chassis Front end be the region away from seesaw, the rear end on chassis is close to the region of seesaw.

A kind of chair bottom, may also be referred to as a kind of Revolving chair chassis, as shown in Fig. 1~Figure 10, including to connect gas The base 1 of bar, the bracket 2 to fixed seat support and the seesaw 3 to connect the chair back, bracket 2 are arranged in base 1, and seesaw 3 is set Put in bracket 2；Specifically, described base 1 includes the bottom plate 4 to connect gas bar, in the left and right sides of bottom plate 4 along perpendicular Nogata is fixedly linked to a supporting plate 5, supporting plate 5 is respectively provided with bottom plate 4, and the whole chassis of 4 pairs of bottom plate and seat support, the chair back are served Supporting role.

As shown in Figure 4,5, the first axis hole 9 is arranged with the rear end of the supporting plate 5 of the both sides of base 1, the middle part of seesaw 3 is installed with First bearing pin 11 and seesaw 3 are rotating fulcrum with the first bearing pin 11, and the first bearing pin 11 is connected through bracket 2 and with base 1；Specifically Say, the rail groove 32 coordinated with the first bearing pin 11 is symmetrically offered in the both sides of bracket 2, the first bearing pin 11 is located in rail groove In 32, the first bearing pin 11 is one whole major axis, and the two ends of the first bearing pin 11 are each sequentially passed through plants after seesaw 3, rail groove 32 In the first axis hole 9.In order that overall keep attractive in appearance, the front end of base 1 is provided with shield 33.

The front end both sides of seesaw 3 symmetrically offer gain 6, the second bearing pin 8 are equipped with gain 6 and the second bearing pin 8 and support Frame 2 is connected；Specifically, the second axis hole 10 is arranged with the front end both sides of bracket 2, the second described bearing pin 8 is one whole long Axle, the two ends of the second bearing pin 8 are inserted in the second axis hole 10 after each passing through gain 6.

Described bracket 2 includes the supporting plate 7 to connect seat support, and the both sides of supporting plate 7 have been extended downwardly and first, second bearing pin 11st, 8 auxiliary section 12 coordinated.

For the movement locus of specification bracket, movement of bracket path generation is determined, will not run chaotically or shake；Seesaw 3 anterior both sides are arranged with controls connecting rod 30, and one end of controls connecting rod 30 rotates with the second bearing pin 8 and is connected, controls connecting rod 30 The other end rotated and be connected by the 3rd bearing pin 31 and base 1.

Described rail groove 32 is towards being obliquely installed close to the direction of seesaw 3 from lower to upper, from lower to upper described waist Groove 6 is towards the direction away from seesaw 3 and is obliquely installed.

The chassis is also included when seesaw 3 prizes the elasticity reset device for enabling bracket to set back after bracket 2 is moved； In the present embodiment, described elasticity reset device is torsion spring 12, and torsion spring 12 is set on the first bearing pin 11, a torsion of torsion spring 12 Arm 121 offsets with base 1, another torque arm 122 and the synchronous axial system of seesaw 3 of torsion spring 12；Specifically, as shown in Fig. 5,7,8, Described seesaw 3 include two side plates 13 of two spaced and parallel side plates 13 and connection and to connect the connecting plate of the chair back 14, connecting plate 14 is located at outside base 1, and gain 6 is opened on side plate 13, baffle plate 15 is provided with the bottom surface of base 1, two sides Cross bar 15 is connected between plate 13, a torque arm 121 and the baffle plate 15 of torsion spring 12 offset, another torque arm 122 of torsion spring 12 with Cross bar 15 offsets.

When the chair back or the reclining of seesaw 3 are to maximum angle, the distance that bracket 2 or seat support are moved backward with the chair back for 15~ 40mm, most preferably 30mm；The chair back backward reclining angle be 10~30 degree, most preferably 21 degree.

When the utility model is installed and used on swivel chair, under original state, people is sitting on swivel chair, as shown in Figure 11,12, In the presence of torsion spring torsion, seat support, human bady gravitational, supporting plate 7 is pressed in two supporting plates (not shown) of base 1；When people leans on backward During arm-chair is carried on the back, as shown in Figure 13,14, bracket 2 can drive seat support to interlock, and make seat support also follow the rotation of the chair back to be moved back by It is dynamic.

Further say, as shown in Figure 15~20, in order to which by seat back lock, a suitable position, the chassis is also set up There is chair back wane lock mechanism, described chair back wane lock mechanism includes lockplate 16, latch 17 and plug housing 18, lockplate 16 are provided with row's lockhole 19, and lockhole 19 is multiple, and the present embodiment is preferably 3, and lockplate 16 is inserted with the synchronous axial system of seesaw 3 Key seat 18 is in the side of lockplate 16 and plug housing 18 is fixedly linked with base 1, the slip of latch 17 be interspersed on plug housing 18 and with Lockhole 19 coordinates, and latch 17 is connected with the elastic yarn 20 that elastic force is produced when form produces change, and the elastic force of elastic yarn 20 makes to insert Pin 17 is automatically inserted into corresponding lockhole 19, and elastic yarn 20 is connected with the drive device being driven to elastic yarn 20；Elastic yarn 20 be steel wire, and its original state is vertical state, when its driven device is dragged, because the upper and lower ends of elastic yarn 20 are fixed, Therefore its run-off the straight deformation, thus produces elastic force.

As shown in Figure 16,17,18, described drive device includes the adjusting rod 21 being horizontally inserted in base 1, adjusting rod 21 Adjust the external member 22 that axial restraint on gas bar, adjusting rod 21 is arranged with a plastic material simultaneously again, external member 22 is provided with neck 34, One end of elastic yarn 20 is stuck in the neck 34 of external member 22, the other end connecting bolt 17 of elastic yarn 20；External member 22 is provided with edge The waist hole 23 that the circumferential direction of external member 22 is set, provided with the screw 24 being connected with adjusting rod 21 in waist hole 23, because waist hole 23 is to spiral shell Silk 24 serves avoidance effect, so that adjusting rod 21 can freely rotate the bar lifting of regulation gas.

Further say, described elastic yarn 20 is provided with extension 25, and the free end of extension 25 is bent to form crotch 26, A word hole 27 is provided with along latch moving direction on plug housing 18, it is interior and crotch 26 that described crotch 26 is plugged on a word hole 27 Stroke is limited by the two ends of a word hole 27, so that crotch 26 is without departing from plug housing 18.

Lockplate 16 is by the following manner installation settings：The two ends of lockplate 16 are respectively sleeved at the pin of cross bar 15 and first On axle 11, plane and the axis perpendicular of the first bearing pin 11 where lockplate 16, lockhole 19 are positioned close to the position of cross bar 15 Put place；Described lockplate 16 is in the middle part of the first bearing pin 11 or at the position at middle part；Insert, lock for the ease of latch 17 The aperture in hole 19 is more than the diameter of latch 17.

As shown in figure 19, to avoid metal contact from sending sound, plastic bushing 28, plastic bushing 28 are cased with cross bar 15 With the intersection location of lockplate 16 at be truncated so as to forming a breach 29, described lockplate 16 is stuck in breach 29 just It is interior.

When in unlocked state, as shown in figure 20, latch 17 departs from lockhole 19, now, and people sits on the seat, can be with The chair back is leaned on any angle；When in the initial position not leaned on and when being allowed to be in the lock state, adjusting rod 21 is stirred, is made Elastic yarn 20 is changed into heeling condition from vertical state, elastic force, that is, cushion effect is produced, when lockplate 16 turns to corresponding lockhole When being aligned with latch, latch is automatically inserted into the locking that lockplate is realized in corresponding lockhole in the presence of cushion effect, makes seesaw It is not rotated further by.

In description of the present utility model, term " multiple " then refers to two or more, unless otherwise clear and definite restriction. Term " first ", " second ", " the 3rd " etc. are only used for the purpose of description, and it is not intended that indicating or implying relative importance.

The term such as term " installation ", " connected ", " connection ", " fixation " all should be interpreted broadly, for example, " connection " can be It is fixedly connected or is detachably connected, or is integrally connected；" connected " can be joined directly together, and can also pass through centre Medium is indirectly connected to.For the ordinary skill in the art, can as the case may be or tool of the present utility model Body is explained to understand concrete meaning of the above-mentioned term in the utility model.

In description of the present utility model, it is to be understood that the orientation or position relationship of the instruction such as term " on ", " under " are Based on orientation shown in the drawings or position relationship, it is for only for ease of description the utility model and simplifies description, rather than indicate Or imply that the device or unit of meaning must have specific direction, with specific azimuth configuration and operation, it is thus impossible to understand For to limitation of the present utility model.

In the description of this specification, the description of term " specific embodiment " etc. means that combining the embodiment or example describes Specific features, structure, material or feature be contained at least one embodiment of the present utility model or example.In this specification In, identical embodiment or example are not necessarily referring to the schematic representation of above-mentioned term.Moreover, the specific features of description, Structure, material or feature can in an appropriate manner be combined in any one or more embodiments or example.

Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, for this For the technical staff in field, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle Within, any modification, equivalent substitution and improvements made etc. should be included within protection domain of the present utility model.

Claims (23)

1. a kind of chair bottom, it is characterized in that：Bracket including base, to fixed seat support and to connect sticking up for the chair back Plate, bracket is arranged in base, and seesaw is arranged in bracket, be installed with the first bearing pin in the middle part of seesaw and seesaw using the first bearing pin for turn Activity supporting point, the first bearing pin is connected through bracket and with base, and seesaw front end both sides symmetrically offer gain, are equipped with gain Second bearing pin and the second bearing pin is connected with bracket, the rail groove coordinated with the first bearing pin is symmetrically offered in the both sides of bracket, the One bearing pin is located in rail groove, and the chassis also includes enabling the elasticity that bracket sets back after seesaw prizes movement of bracket Resetting means.

2. chair bottom according to claim 1, it is characterised in that：The anterior both sides of seesaw are arranged with control and connected Bar, one end of controls connecting rod is rotated with the second bearing pin and is connected, and the other end of controls connecting rod is connected by the 3rd bearing pin and base rotation Connect.

3. chair bottom according to claim 1, it is characterised in that：The first described bearing pin is one whole major axis, the The two ends of one bearing pin are connected after each sequentially passing through seesaw, rail groove with base.

4. chair bottom according to claim 1, it is characterised in that：The first described bearing pin is two independent short Axle, correspondence is fixed with two supports on base, one end of each short axle sequentially pass through after seesaw, rail groove with base phase Even, the other end of each short axle is inserted in corresponding support.

5. chair bottom according to claim 1, it is characterised in that：The second described bearing pin is one whole major axis, the The two ends of two bearing pins are connected after each passing through gain with bracket.

6. chair bottom according to claim 1, it is characterised in that：First bearing pin is connected with base to be referred to：In base The both sides of rear end are arranged with the first axis hole, and the first bearing pin is plugged in the first axis hole.

7. chair bottom according to claim 1, it is characterised in that：Second bearing pin is connected with bracket to be referred to：In bracket The both sides of front end are arranged with the second axis hole, and the second bearing pin is plugged in the second axis hole.

8. chair bottom according to claim 1, it is characterised in that：Described base includes the bottom to connect gas bar Plate, a supporting plate is vertically respectively provided with the left and right sides of bottom plate, and supporting plate is fixedly linked with bottom plate, the first bearing pin be with The supporting plate of base is connected；Described bracket includes the supporting plate to connect seat support, and supporting plate both sides have extended downwardly with first, the The auxiliary section that two bearing pins coordinate.

9. chair bottom according to claim 1, it is characterised in that：Described rail groove is towards close from lower to upper The direction of seesaw is obliquely installed, and described gain is towards the direction away from seesaw and is obliquely installed from lower to upper.

10. chair bottom according to claim 1, it is characterised in that：Bracket connects elasticity reset device, described bullet Property resetting means be spring, one end of spring is connected with bracket, and the other end of spring is connected with base.

11. chair bottom according to claim 1, it is characterised in that：Described elasticity reset device is torsion spring, torsion spring It is set on the first bearing pin, a torque arm of torsion spring offsets with base, another torque arm and the seesaw synchronous axial system of torsion spring.

12. chair bottom according to claim 11, it is characterised in that：Described seesaw include two it is spaced and parallel Two side plates of side plate and connection and to connect the connecting plate of the chair back, connecting plate is located at outside base, on the bottom surface of base Provided with baffle plate, cross bar is connected between two side plates, a torque arm of torsion spring offsets with baffle plate, another torque arm of torsion spring with Cross bar offsets.

13. chair bottom according to claim 1, it is characterised in that：The chassis is additionally provided with chair back seesaw locking machine Structure, described chair back wane lock mechanism includes lockplate, latch and plug housing, and lockplate is provided with row's lockhole, lockplate With seesaw synchronous axial system, plug housing is in by lockplate and plug housing is fixedly linked with base, and latch slides and is interspersed in plug housing Above and with lockhole coordinate, latch is connected with the elastic yarn that elastic force is produced when form produces change, the elastic force of elastic yarn makes latch It is automatically inserted into corresponding lockhole, elastic yarn is connected with the drive device being driven to elastic yarn.

14. chair bottom according to claim 13, it is characterised in that：Described drive device includes being horizontally inserted bottom Adjusting rod in seat, axial restraint is arranged with sleeve piece on adjusting rod, and one end of elastic yarn is stuck in external member, elastic yarn it is another Hold connecting bolt.

15. chair bottom according to claim 14, it is characterised in that：External member is provided with along external member circumferential direction and set Waist hole, provided with the screw that is connected with adjusting rod in waist hole.

16. chair bottom according to claim 13, it is characterised in that：Described elastic yarn is provided with extension, extension The free end of section is bent to form crotch, and a word hole is provided with along latch moving direction on plug housing, and described crotch is plugged on one In word hole and the stroke of crotch is limited by a word hole two ends.

17. chair bottom according to claim 13, it is characterised in that：Described seesaw include two it is spaced and parallel Two side plates of side plate and connection and to connect the connecting plate of the chair back, cross bar, lockplate are connected between two side plates Two ends be respectively sleeved on cross bar and the first bearing pin, lockhole is positioned close at the position of cross bar.

18. chair bottom according to claim 13, it is characterised in that：The aperture of lockhole is more than the diameter of latch.

19. chair bottom according to claim 17, it is characterised in that：Described lockplate is in the middle part of the first bearing pin Or at the position at middle part.

20. chair bottom according to claim 17, it is characterised in that：Plastic bushing, plastic sheath are cased with cross bar It is truncated to form a breach at Guan Yu lockplate intersection locations, described lockplate is stuck in breach just.

21. chair bottom according to claim 17, it is characterised in that：Described lockplate is welded and fixed with cross bar.

22. a kind of office chair, it is characterized in that：Including the chair back, seat support and the office chair as described in any one of claim 1~21 Chassis, the chair back is connected with seesaw, and seat support is connected with bracket.

23. office chair according to claim 22, it is characterized in that：Also include gas bar, described gas bar and chair bottom Base be connected.