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WO2015043474A1 - 一种用于转椅底盘的托架驱动机构 - Google Patents

一种用于转椅底盘的托架驱动机构 Download PDF

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Publication number
WO2015043474A1
WO2015043474A1 PCT/CN2014/087322 CN2014087322W WO2015043474A1 WO 2015043474 A1 WO2015043474 A1 WO 2015043474A1 CN 2014087322 W CN2014087322 W CN 2014087322W WO 2015043474 A1 WO2015043474 A1 WO 2015043474A1
Authority
WO
WIPO (PCT)
Prior art keywords
bracket
pin
base
pin shaft
shaft
Prior art date
Application number
PCT/CN2014/087322
Other languages
English (en)
French (fr)
Inventor
何基
阮正富
Original Assignee
浙江永艺家具股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 浙江永艺家具股份有限公司 filed Critical 浙江永艺家具股份有限公司
Publication of WO2015043474A1 publication Critical patent/WO2015043474A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03294—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest slidingly movable in the base frame, e.g. by rollers

Definitions

  • the invention relates to the technical field of a swivel chair and an office chair, in particular to a bracket driving mechanism for a swivel chair chassis.
  • the swivel chair chassis also known as the swivel chair tray, is an important part under the swivel seat cushion. The lifting of the seat cushion and the tilting angle adjustment of the backrest are all done by the chassis.
  • the current swivel chair tray is generally composed of upper tray, lower joist, rotating shaft and spring device. After the upper dial and the swivel seat are fixed on the back, the swivel chair can be tilted around the rotating shaft and can actively respond to the user. Have a sense of comfort.
  • a tray (patent number: 02287885.8), which mainly comprises a bottom plate, a movable seat, a conical tube and an adjusting device.
  • the movable seat is movably connected to the bottom plate, and a conical tube connecting the gas bar in the middle of the movable seat is connected.
  • the cone fixing plate 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, a torsion spring a fixing plate, the adjusting rod is inserted in the movable seat, the adjusting plate
  • the fixed connection is connected to one end of the adjusting rod inserted into the movable seat, one side of the adjusting plate contacts the gas pressure bar, the other side is connected with the torsion spring a; and the other side of the adjusting plate is provided with an adjusting plate stopping piece.
  • the adjustment device of the above-mentioned swivel chair tray is completely adjusted by the torsion spring.
  • the force of the torsion spring required is different, so that the product does not have good versatility.
  • the Chinese patent of the "201020264417.6" patent discloses a rolling shaft adjustment swivel chair tray which utilizes the gravity transmitted on the seat surface to transmit the restoring force of the backrest, and can basically achieve the use of people who meet different body weights without Adjustment.
  • the problem with the above chassis is that during the backward tilting of the human body, under the same seat gravity loading condition, the restoring torque of the chassis is gradually reduced or remains unchanged, and is applied to the seat back during the tilting process.
  • the pressure becomes larger, the driving force becomes larger, the recovery force is insufficient to counteract the driving force, and the restoring force is too dependent on the elastic recovery of the elastic reset device, so the applicable crowd is limited, and the person with a light weight is difficult to lean, and the weight is heavier. It is difficult for people to get up after they have fallen.
  • Such a chassis general frame includes a base for connecting the air rod, a bracket for fixing the seat, and a rocker for connecting the back of the seat, and the bracket is driven by the rocker to reset the bracket, the bracket or the tilt
  • the board is connected with an elastic reset device.
  • the drive mechanism of the bracket is the design focus, which is the key to solving the above problems.
  • the present invention overcomes the deficiencies in the prior art described above, and provides a bracket driving mechanism that can provide a reasonable restoring force during the movement of the bracket; thereby loading the seat back on the seat during the tilting process.
  • the ratio of gravity transmission to the backrest restoring force is gradually increased, and a reasonable backrest restoring force is always provided throughout the process, so that people who are lighter or heavier can easily lean back and return to get up.
  • a bracket driving mechanism for a swivel chair chassis includes a base for connecting a gas rod, a bracket for fixing the seat, and a rocker for connecting the back of the chair, wherein the bracket and the rocker are disposed in the base.
  • the middle part of the rocker is hinged to the base through the first pin shaft, and the front part of the rocker is provided with a first link and a second link, one end of the first link is hinged with the front end of the rocker, and the other end of the first link is One end of the two links is hinged through the third pin shaft and the third pin shaft is connected to the bracket, and the other end of the second link is hinged to the base through the second pin shaft, and the first pin is symmetrically opened on both sides of the bracket
  • the shaft is matched with a track groove for guiding the movement track of the bracket.
  • the first pin shaft is disposed in the track groove, and the rocker rotates through the first and second links to drive the carriage to move along the track of the track groove.
  • the second pin has two forms that do not interfere with the movement of the carriage.
  • the second pin is coupled to the base after passing or avoiding the bracket.
  • a hollow groove that cooperates with the second pin shaft to avoid the second pin shaft during the movement of the bracket is symmetrically disposed on both sides of the bracket, and the second pin shaft is disposed in the hollow groove.
  • Hollow slots are formed on both sides of the bracket so that the bracket is not obstructed by the second pin when it is moving.
  • the portion of the bracket that interferes with the second pin shaft is cut away such that the bracket avoids the second pin.
  • the first pin shaft is a long axis, and both ends of the first pin shaft are respectively connected to the base after passing through the rocker and the track groove. This ensures that it provides sufficient strength to allow the rocker to rotate freely.
  • the first pin shaft is two independent short shafts, and two brackets are fixedly arranged on the base, and one end of each short shaft passes through the rocker and the track slot in turn, and is connected to the base, and each The other end of the stub shaft is inserted into the corresponding bracket.
  • the interior of the base is more compact, and the first pin shaft is supported by the bracket to meet the strength requirement.
  • the second pin shaft is an entire long shaft, and both ends of the second pin shaft are sequentially connected to the base through the second connecting rod and the hollow groove. This also ensures that it provides sufficient strength to allow the second link to rotate freely.
  • the second The pin shaft is an entire long shaft, and both ends of the second pin shaft are respectively inserted into the second shaft hole through the second link.
  • the second pin shaft is two independent small shafts, and two supports are fixedly fixed on the base, and one end of each small shaft passes through the second connecting rod and the hollow slot in sequence, and is connected to the base. The other end of each small shaft is inserted into the corresponding support.
  • the use of such a structure makes the interior of the base more compact, and can avoid the elastic reset device from being obstructed, and the second pin shaft is supported by the support to meet the strength requirement.
  • the second The pin shaft is two independent small shafts, and two supports are fixedly arranged on the base. One end of each small shaft passes through the second link and is connected with the base, and the other end of each small shaft is inserted in the corresponding Inside the support.
  • connection of the first pin shaft to the base means that the first shaft hole is symmetrically disposed on both sides of the rear end of the base, and the first pin shaft is inserted in the first shaft hole.
  • connection of the second pin shaft to the base means that the second shaft hole is symmetrically disposed on both sides of the front end of the base, and the second pin shaft is inserted into the second shaft hole.
  • the attachment of the third pin to the bracket means that the third pin is inserted into the bracket.
  • the third pin can drive the carriage to move synchronously.
  • the base comprises a bottom plate for connecting the gas rods, and a support plate is respectively arranged in a vertical direction on the left and right sides of the bottom plate, and the support plate is fixedly connected with the bottom plate, and the first pin shaft and the second pin shaft are
  • the support plate of the base is connected;
  • the bracket comprises two substrates arranged in parallel and arranged in a vertical direction, the substrate is attached to the support plate, and the upper end of the substrate is bent to form a support plate for connecting the seat, in two substrates
  • a connecting plate is fixedly connected between the two substrates.
  • the base encloses the bracket therein, the structure is reasonable, and the overall appearance is more beautiful.
  • the first link from bottom to top is disposed obliquely toward the rocker, and the second link from the bottom to the top is inclined toward the direction away from the rocker, in the bracket During the movement, the angle between the second link and the vertical line does not exceed 90 degrees.
  • the back of the human body applies a driving force to the backrest connected to the rocker, and the rocker rotates to move the connecting rod, so that the angle between the second connecting rod and the vertical line gradually increases.
  • the angle between the two links and the horizontal line is gradually reduced, and the component of the rotational force applied by the bracket to the second link is increased, thereby realizing the gradual increase of the restoring moment of the rocker and the link mechanism by gravity loading, and As the driving force of the backrest is gradually increased, the restoring force is less dependent on the elastic restoring force of the elastic resetting device, and is suitable for the needs of different fat and thin people.
  • the track grooves and the hollow grooves described above from the bottom are inclined toward the direction of the rocker.
  • a bracket driving mechanism for a swivel chair chassis includes a base for connecting a gas rod, a bracket for fixing the seat, and a rocker for connecting the back of the chair, wherein the bracket and the rocker are disposed in the base.
  • the middle part of the rocker is hinged to the base through the first pin shaft, and the front part of the rocker is provided with a first link and a second link, one end of the first link is hinged with the front end of the rocker, and the other end of the first link is One end of the two links is hinged through the third pin shaft and the third pin shaft is connected to the bracket, and the other end of the second link is hinged to the base through the second pin shaft, and is symmetrically opened on both sides of the bracket for guiding the bracket
  • the track groove of the movement track is provided with a guide shaft matched with the track groove on the base, the guide shaft is inserted in the track groove, and the rocker rotates through the first and second links to drive the track along the track groove motion. In this manner
  • the first pin is connected to the base after passing through or avoiding the bracket, and likewise, the second pin is connected to the base after passing through or avoiding the bracket.
  • the first pin nor the second pin interferes with the movement of the bracket.
  • the first pin passes through the bracket, and the first pin is symmetrically opened on both sides of the bracket, and the first pin is engaged with the first pin to avoid the first pin when the bracket moves.
  • the shaft is disposed in the hollow slot; the first pin avoiding the bracket means that the portion of the bracket that interferes with the first pin shaft is cut off so that the bracket avoids the first pin shaft.
  • the second pin passing through the bracket means that the hollow pin 2 for engaging the second pin shaft during the movement of the bracket is symmetrically opened on both sides of the bracket, and the second pin is The shaft is disposed in the hollow groove 2; the second pin avoiding the bracket means that the portion of the bracket that interferes with the second pin shaft is cut off so that the bracket avoids the second pin.
  • the bracket driving mechanism of the present invention can match the reclining restoring force of the seat back according to the weight of the human body, so that people who are light or heavy can easily recline and get up.
  • the pin shaft, the rocker, the first link and the second link of each hinge point of the present invention form a four-point linkage mechanism to form a force transmission
  • the seat back connection is fixed to the rocker as a four-point linkage mechanism.
  • the driving force of the human body is applied to the seat by the third pin shaft hinged to the bracket to form a restoring force applied to the four-point link mechanism, and the driving force and the restoring force of the four-point link mechanism form a confrontational relationship.
  • the angle between the second link of the four-point linkage mechanism of the present invention and the horizontal line is gradually reduced, and the rotational force component of the bracket applied to the second link is increased, thereby realizing Gravity loading gradually increases the restoring moment of the four-bar linkage mechanism, and is opposed to the gradually increasing driving force.
  • the restoring force is less dependent on the elastic restoring force of the elastic resetting device, and the applicable population is wider, the weight is lighter or Heavy people can easily lean back and get up.
  • the seat equipped with the bracket driving mechanism and the chassis of the present invention in the process of leaning back, the seat also moves backwards following the rotation of the seat back, so that the back waist support always fits the back of the human body.
  • the seat in the process of leaning back, the seat also moves backwards following the rotation of the seat back, so that the back waist support always fits the back of the human body.
  • the seat Corresponding position, avoiding the back waist support from the waist of the human body to produce a waist suspension, and also avoiding friction between the clothes and the seat back.
  • FIG. 1 is a schematic perspective structural view of a chassis of the present invention in Embodiment 1;
  • FIG. 2 is a perspective view showing the perspective of another embodiment of the chassis of the present invention in Embodiment 1;
  • Figure 3 is a schematic view showing the rocker and the bracket in the initial state in the first embodiment
  • FIG. 4 is a schematic view showing the rocker and the bracket in the up state in the first embodiment
  • Figure 5 is a schematic view showing the disassembled structure of the bracket and the base in the first embodiment
  • FIG. 6 is a schematic view showing the split structure of the bracket and the base at another angle in the embodiment 1;
  • FIG. 7 is a schematic perspective structural view of a chassis in Embodiment 2.
  • Figure 8 is a schematic view showing the disassembled structure of the bracket and the base in the second embodiment
  • Figure 9 is a schematic view of a person sitting on a swivel chair in an unsinkable state
  • Figure 10 is a schematic view showing a state in which a person sits on a swivel chair and leans back;
  • FIG 11 is a perspective view showing the structure of the chassis of Embodiment 3.
  • Figure 12 is a schematic view showing the disassembled structure of the chassis in the third embodiment.
  • Embodiment 1 Firstly, the reference orientation of each component of the present invention is defined.
  • the front of the swivel chair is the front end
  • the rear of the swivel chair includes the backrest at the rear end
  • the front end of the chassis is far away.
  • the rear end of the chassis is the area near the rocker.
  • a bracket driving mechanism for a swivel chair chassis includes a base for connecting a gas rod, a bracket 2 for fixing the seat, and a rocker 3 for connecting the seat back.
  • the frame 2 and the rocker 3 are disposed in the base 1; specifically, the base 1 includes a bottom plate 4 for connecting the gas rods, and a support plate 5 is arranged on each of the left and right sides of the bottom plate 4 in a vertical direction.
  • the plate 5 is fixedly connected to the bottom plate 4, and the bottom plate 4 supports the entire chassis and the seat and the back;
  • the bracket 2 includes two substrates 6 arranged in parallel and arranged in a vertical direction, and the substrate 6 is attached to the support.
  • the upper end of the substrate 6 is bent to form a support plate 7 for connecting the seat, and the connecting plate 8 is fixedly connected between the two substrates 6.
  • the connecting plate 8 can be multiple, and the connecting plate 8 connects the two substrates 6. The connection is fixed, and the rocker 3 is disposed between the two substrates 6.
  • a first shaft hole 9 and a second shaft hole 10 are symmetrically disposed at a rear end and a front end of the support plate 5 on both sides of the base 1.
  • the first pin 11 is inserted in the middle of the rocker 3 and the rocker 3 is the first pin 11
  • the first pin 11 is a long axis, and both ends of the first pin 11 are respectively inserted through the rocker 3 and the bracket 2 and inserted into the first shaft hole 9;
  • the first link 13 and the second link 14 are symmetrically disposed on both sides of the front portion of the plate 3.
  • the first link 13 from the bottom to the top is inclined toward the direction of the rocker 3.
  • the second link 14 from the bottom to the top is inclined toward the direction away from the rocker 3, and the angle between the second link 14 and the vertical line does not exceed 90 during the movement of the bracket 2 degree.
  • first link 13 is hinged to the front end of the rocker 3 through the fourth pin shaft 16, and the other end of the first link 13 is hinged to the end of the second link 14 via the third pin 15 and the third pin 15 is interspersed.
  • the other end of the second link 14 is pierced with a second pin 12 and the second pin 12 passes through the bracket 2 and is inserted into the second shaft hole 10
  • the second pin shaft 12 is a long axis, and both ends of the second pin 12 are sequentially inserted through the second link 14 and the bracket 2, and then inserted into the second shaft hole 10; because the rocker 3 drives the bracket through the connecting rod 2 movement, so that the track 6 corresponding to the first pin 11 for guiding the movement track of the bracket 2 and the second pin 12 are matched symmetrically on the substrate 6 on both sides of the bracket 2
  • the hollow groove 18 of the second pin shaft 12 is avoided when the bracket 2 is moved.
  • the track groove 17 and the hollow groove 18 are also opened to enable the first pin shaft 11 and the second pin shaft 12 to pass through the bracket 2, from the bottom to the bottom.
  • the track groove 17 and the hollow groove 18 are inclined in the direction of the rocker 3, and the first pin 11 and the second pin 12 are respectively disposed in the track groove 17 and the hollow groove 18, and the track groove 17 is matched with the first pin 11 Used to guide the trajectory of the carrier, the hollow groove 18 only for the second through the bracket pin 12 does not hinder movement of the carriage.
  • the bracket 2 is connected with an elastic returning device, and the elastic returning device is a spring 19, one end of which is connected to the bracket 2, and the other end of the spring 19 is connected to the base 1.
  • a cross bar 20 is disposed on the bracket 2, and both ends of the cross bar 20 are fixedly connected with the two substrates 6 of the bracket 2, the spring 19 is inclined, and the upper end of the spring 19 is hooked to the cross bar 20, the spring The lower end of 19 is hooked to the lower edge of the front end of the base 1.
  • 1 to 4 springs 19 can be set according to actual needs.
  • the distance between the bracket 2 or the seat back movement with the back of the chair is 15 to 40 mm, preferably 30 mm; the angle of the back of the seat back is 10 to 30 Degree, the best is 21 degrees.
  • Embodiment 2 This embodiment is different from Embodiment 1 in that, as shown in FIGS. 7 and 8, the second pin 12 is two independent small shafts 41, and is fixedly fixed on the base 1. Two pedestals 42, one end of each small shaft 41 passes through the second connecting rod 14 and the hollow groove 18 in turn, and is inserted into the second shaft hole 10, and the other end of each small shaft 41 is inserted into the corresponding bearing. 42 inside.
  • the spring 19 can be avoided relative to the form of a long axis to prevent the spring 19 from being obstructed.
  • Embodiment 3 This embodiment is different from Embodiment 1 in that, as shown in FIGS. 11 and 12, the portions of the substrate 6 on both sides of the bracket 2 interfere with the second shaft hole 10 and the second pin shaft 12 are cut off. Thereby, the bracket 2 avoids the second shaft hole 10 and the second pin shaft 12, and the second pin shaft 12 is directly inserted into the second shaft hole 10.
  • Embodiment 4 The bracket driving mechanism of this embodiment is different from Embodiment 1 in that the first pin shaft does not cooperate with the track groove, but the guide shaft is additionally provided on the base to cooperate with the track groove, specifically
  • the bracket driving mechanism includes a base for connecting the gas rod, a bracket for fixing the seat, and a rocker for connecting the back of the chair.
  • the bracket and the rocker are all disposed in the base, and the middle of the rocker passes through the first
  • the pin shaft is hinged to the base, and the front part of the rocker is provided with a first link and a second link, one end of the first link is hinged with the front end of the rocker, and the other end of the first link and one end of the second link pass
  • the third pin shaft is hinged and the third pin shaft is connected to the bracket, and the other end of the second link is hinged to the base through the second pin shaft, and the track groove for guiding the movement track of the bracket is symmetrically opened on both sides of the bracket
  • the guide shaft is arranged on the base, and the guide shaft is inserted into the track groove, and the rocker rotates through the first and second links to drive the carriage to move along the track of the track groove.
  • the first pin is connected to the base after passing through or avoiding the bracket.
  • the second pin is connected to the base after passing through or avoiding the bracket.
  • the passage of the first pin through the bracket means that a hollow groove corresponding to the first pin shaft for escaping the first pin shaft during the movement of the bracket is symmetrically opened on both sides of the bracket, and the first pin shaft is disposed In the hollow slot 1; the first pin avoiding the bracket means that the portion of the bracket that interferes with the first pin shaft is cut off so that the bracket avoids the first pin shaft.
  • the second pin passing through the bracket means that the hollow pin 2 corresponding to the second pin shaft for escaping the second pin shaft during the movement of the bracket is symmetrically opened on both sides of the bracket, and the second pin shaft is disposed In the hollowing groove 2; the second pin avoiding the bracket means that the portion of the bracket that interferes with the second pin shaft is cut off so that the bracket avoids the second pin.

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  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Chairs Characterized By Structure (AREA)

Abstract

一种用于转椅底盘的托架驱动机构，包括底座（1）、托架（2）及翘板（3），托架（2）、翘板（3）均设置在底座（1）内，翘板（3）中部通过第一销轴（11）与底座（1）铰接，翘板（3）的前部设有第一连杆（13）、第二连杆（14），第一连杆（13）的一端与翘板（3）前端铰接，第一连杆（13）的另一端与第二连杆（14）的一端通过第三销轴（15）铰接且第三销轴（15）与托架（2）相连，第二连杆（14）的另一端通过第二销轴（12）与底座（1）铰接，在托架（2）的两侧对称开设有与第一销轴（11）配合的用以导引托架（2）运动轨迹的轨道槽（17），第一销轴（11）穿设在轨道槽（17）内，翘板（3）转动通过第一连杆（13）、第二连杆（14）带动托架（2）沿轨道槽（17）的轨迹运动。该托架驱动机构可根据人体重量，使椅背（37）倾仰回复力有相应匹配，使得无论体重轻或者重的人都可以轻松倾仰回复起身。

Description

一种用于转椅底盘的托架驱动机构 技术领域
本发明涉及转椅、办公椅技术领域，特别涉及一种用于转椅底盘的托架驱动机构。
背景技术
转椅底盘，也称转椅托盘，是装在转椅座垫下方的一个重要部件，座垫的升降，靠背的倾仰角度调节都是依靠底盘来完成的。
目前的转椅托盘普遍是由上托盘、下托梁、转轴及弹簧装置等零部件组成，上转盘与转椅座椅背面固定后，转椅可绕转轴作适当倾仰，并可主动回复，使使用者有舒适感。例如，中国专利公开了一种托盘(专利号为：02287885.8)，主要包括底板、活动座、锥形管和调节装置,活动座活动连接在底板,在活动座的中间连接气压棒的锥形管,由锥管固定板和锥形管一起焊接在活动座上；所述的调节装置包括有调节杆、调节板、扭簧a、扭簧a固定板,调节杆穿插在活动座内,调节板固定连接在调节杆插入活动座内的一端上,调节板的一面接触气压棒,另一面与扭簧a连接；在调节板的另一面上设有调节板止旋片。
上述转椅托盘的调节装置完全靠扭力弹簧来调节，对于体重不同的人来讲，所需要的扭力弹簧的力需要有所不同，使产品没有很好的通用性。针对此问题，专利号为：“201020264417.6”的中国专利公开了一种滚动轴调节转椅托盘，其利用加载在座面的重力传导为靠背的回复力，能基本实现满足不同体重的人使用而不需调节。但坐在安装上述托盘的座椅上向后倾仰时，由于人体部分重力由靠背支撑且比重逐步增大，使加载在座面的重力逐步变小，则重力传导到靠背的回复力随之变小，导致在最大倾仰角时靠背回复力不足，回复力过于依赖弹性复位装置的弹性回复，因此适用人群范围有限，体重较轻的人难以倾仰，体重较重的人倾仰后难以回复起身，无法达到最合理匹配回复力。
上述底盘存在的问题是，在人体向后倾仰过程中，在相同的椅座重力加载情况下，底盘的回复力力矩都是逐步减小或保持不变，由于倾仰过程中施加于椅背的压力变大，驱动力变大，导致回复力不足以对抗驱动力，且回复力过于依赖弹性复位装置的弹性回复，因此适用人群范围有限，体重较轻的人难以倾仰，体重较重的人倾仰后难以回复起身。
因此需要设计一种回复力对弹性复位装置的弹性回复力依赖程度小的转椅底盘，使其能够适用范围更广的人群，使体重较轻或较重的人都能轻松地倾仰和回复起身。这样的底盘大体框架包括用以连接气杆的底座、用以固定椅座的托架及用以连接椅背的翘板，托架通过翘板来驱动，为使托架复位，托架或翘板连接有弹性复位装置，在这样的底盘里，托架的驱动机构是设计的重点，其是能够解决上述问题的关键所在。
 技术解决方案
本发明克服了上述现有技术中所存在的不足，提供了一种可在托架运动过程中提供合理回复力的托架驱动机构；从而使椅背在倾仰过程中，加载于椅座的重力传导到椅背回复力的比率逐步增大，在整个过程中始终提供合理的靠背回复力，使得体重较轻或较重的人都能轻松地倾仰和回复起身。
本发明的技术方案是这样实现的：
一种用于转椅底盘的托架驱动机构，包括用以连接气杆的底座、用以固定椅座的托架及用以连接椅背的翘板，托架、翘板均设置在底座内，翘板中部通过第一销轴与底座铰接，翘板的前部设有第一连杆、第二连杆，第一连杆的一端与翘板前端铰接，第一连杆的另一端与第二连杆的一端通过第三销轴铰接且第三销轴与托架相连，第二连杆的另一端通过第二销轴与底座铰接，在托架的两侧对称开设有与第一销轴配合的用以导引托架运动轨迹的轨道槽，第一销轴穿设在轨道槽内，翘板转动通过第一、第二连杆带动托架沿轨道槽的轨迹运动。
第二销轴有两种形式不妨碍托架运动，作为优选，第二销轴穿过或避开托架后与底座相连。
作为优选，在托架的两侧对称开设有与第二销轴配合的用以在托架运动时避让第二销轴的镂空槽，第二销轴穿设在镂空槽内。在托架两侧开设了镂空槽，使得托架在运动时，不受第二销轴的阻碍。
作为优选，托架两侧的干涉到第二销轴的部分被切除从而使得托架避开第二销轴。
作为优选，所述的第一销轴为一整根长轴，第一销轴的两端各自依次穿过翘板、轨道槽后与底座相连。这样可以保证其能够提供足够的强度，使翘板能够转动自如。
作为优选，所述的第一销轴为两根独立的短轴，在底座上对应固定设有两个支架，每个短轴的一端依次穿过翘板、轨道槽后与底座相连，每个短轴的另一端插在相应的支架内。采用这样的结构使底座内部更加简洁，并且第一销轴通过支架支撑，满足了强度的要求。
作为优选，所述的第二销轴为一整根长轴，第二销轴的两端各自依次穿过第二连杆、镂空槽后与底座相连。同样这样可以保证其能够提供足够的强度，使第二连杆能够转动自如。
托架两侧的干涉到第二销轴的部分被切除从而使得托架避开第二销轴及第二销轴与底座的连接处，在这样的条件下，作为优选，所述的第二销轴为一整根长轴，第二销轴的两端各自穿过第二连杆后插置在第二轴孔内。
作为优选，所述的第二销轴为两根独立的小轴，在底座上对应固定设有两个支座，每个小轴的一端依次穿过第二连杆、镂空槽后与底座相连，每个小轴的另一端插在相应的支座内。采用这样的结构使底座内部更加简洁，并且可以避开弹性复位装置，使其不受阻碍，而且第二销轴通过支座支撑，满足了强度的要求。
托架两侧的干涉到第二销轴的部分被切除从而使得托架避开第二销轴及第二销轴与底座的连接处，在这样的条件下，作为优选，所述的第二销轴为两根独立的小轴，在底座上对应固定设有两个支座，每个小轴的一端穿过第二连杆后与底座相连，每个小轴的另一端插在相应的支座内。
作为优选，第一销轴与底座相连是指：在底座后端的两侧对称设有第一轴孔，第一销轴插置在第一轴孔内。
作为优选，第二销轴与底座相连是指：在底座前端的两侧对称设有第二轴孔，第二销轴插置在第二轴孔内。
作为优选，第三销轴与托架相连是指：第三销轴穿插在托架内。第三销轴可以带动托架同步运动。
作为优选，所述的底座包括用以连接气杆的底板，在底板的左右两侧沿竖直方向各设有一支撑板，支撑板与底板固定相连，第一销轴、第二销轴是与底座的支撑板相连；所述的托架包括两块间隔平行且沿竖直方向设置的基板，基板贴于支撑板，且基板上端弯折形成用以连接椅座的托板，在两块基板之间固定连接有连板，翘板设置在两基板之间。底座将托架包覆于其中，结构合理，整体更加美观。
作为优选，由下往上所述的第一连杆是朝着接近翘板的方向倾斜设置，由下往上所述的第二连杆是朝着背离翘板的方向倾斜设置，在托架运动过程中，第二连杆与铅垂线的夹角始终不超过90度。在人体向后倾仰过程中，人体背部对连接于翘板的靠背施加驱动力，翘板转动以撬动连杆运动，使得第二连杆与铅垂线的夹角逐渐增大，而第二连杆与水平线的锐角夹角逐步减小，则托架施加于第二连杆的旋转力分力增大，从而实现重力加载对于翘板及连杆机构的回复力力矩逐步增大，与随着靠背的倾仰逐步增大的驱动力形成对抗，回复力对弹性复位装置的弹性回复力依赖较小，适合不同胖瘦人群的需要。
为了能让托架始终沿斜向上方向运动，作为优选，由下往上所述的轨道槽与镂空槽均是朝着靠近翘板的方向倾斜设置。
一种用于转椅底盘的托架驱动机构，包括用以连接气杆的底座、用以固定椅座的托架及用以连接椅背的翘板，托架、翘板均设置在底座内，翘板中部通过第一销轴与底座铰接，翘板的前部设有第一连杆、第二连杆，第一连杆的一端与翘板前端铰接，第一连杆的另一端与第二连杆的一端通过第三销轴铰接且第三销轴与托架相连，第二连杆的另一端通过第二销轴与底座铰接，在托架的两侧对称开设有用以导引托架运动轨迹的轨道槽，在底座上设有与轨道槽配合的导轴，所述的导轴插在轨道槽内，翘板转动通过第一、第二连杆带动托架沿轨道槽的轨迹运动。在这样的方式中，第一销轴、第二销轴均不对托架运动轨迹起到导引作用，而是由底座上另外设置的导轴与托架上的轨道槽配合，使托架能够沿轨道槽的轨迹运动。
作为优选，第一销轴穿过或避开托架后与底座相连，同样，第二销轴穿过或避开托架后与底座相连。由此，第一销轴、第二销轴均不对托架的运动产生妨碍。
作为优选，第一销轴穿过托架是指：在托架的两侧对称开设有与第一销轴配合的用以在托架运动时避让第一销轴的镂空槽一，第一销轴穿设在镂空槽一内；第一销轴避开托架是指：托架两侧的干涉到第一销轴的部分被切除从而使得托架避开第一销轴。
作为优选，第二销轴穿过托架是指：在托架的两侧对称开设有与第二销轴配合的用以在托架运动时避让第二销轴的镂空槽二，第二销轴穿设在镂空槽二内；第二销轴避开托架是指：托架两侧的干涉到第二销轴的部分被切除从而使得托架避开第二销轴。
 有益效果
本发明的托架驱动机构可根据人体重量，使椅背倾仰回复力有相应匹配，使得无论体重轻或者重的人都可以轻松倾仰回复起身。
具体的说，本发明各铰接点的销轴、翘板、第一连杆、第二连杆形成四点连杆机构，形成力的传导，椅背连接固定于翘板作为四点连杆机构的驱动力，人体施加于椅座的重力通过铰接于托架的第三销轴形成施加在四点连杆机构的回复力，四点连杆机构的驱动力和回复力形成对抗关系。
在人体向后倾仰过程中，本发明四点连杆机构的第二连杆与水平线的锐角夹角逐步减小，则托架施加于第二连杆的旋转力分力增大，从而实现重力加载对于四连杆机构的回复力力矩逐步增大，与逐步增大的驱动力形成对抗，回复力对弹性复位装置的弹性回复力依赖较小，适用人群范围更广，体重较轻或较重的人都能轻松地倾仰和回复起身。
再者，装备了本发明托架驱动机构及底盘的座椅，在人在向后靠的过程中，椅座也跟随椅背的转动向后移动，使靠背腰部支撑始终贴合人体后背的对应位置，避免了靠背腰部支撑脱离人体腰部产生腰部悬空，也避免了衣物与座椅靠背产生摩擦。
 附图说明
图1为实施例1中本发明底盘的立体结构示意图；
图2为实施例1中本发明底盘另一角度的立体结构示意图；
图3为实施例1中翘板及托架处于初始状态的示意图；
图4为实施例1中翘板及托架处于翘起状态的示意图；
图5为实施例1中托架与底座的拆分结构示意图；
图6为实施例1中托架与底座另一角度的拆分结构示意图；
图7为实施例2中底盘的立体结构示意图；
图8为实施例2中托架与底座的拆分结构示意图；
图9为人坐在转椅上处于未倾仰状态的示意图；
图10为人坐在转椅上向后倾仰时的状态示意图；
图11为实施例3中底盘的立体结构示意图；
图12为实施例3中底盘的拆分结构示意图。
 本发明的实施方式
本发明的具体实施方式如下：
实施例1：首先定义本发明各部件的参考方位，本发明将底盘及转椅在正常安装使用时，转椅的前方为前端，而转椅的后方包括靠背所在的位置为后端，底盘的前端为远离翘板的区域，底盘的后端为靠近翘板的区域。
一种转椅底盘的托架驱动机构，如图1～图6所示，包括用以连接气杆的底座1、用以固定椅座的托架2及用以连接椅背的翘板3，托架2、翘板3设置在底座1内；具体的说，所述的底座1包括用以连接气杆的底板4，在底板4的左右两侧沿竖直方向各设有一支撑板5，支撑板5与底板4固定相连，底板4对整个底盘及椅座、椅背起到了支撑作用；所述的托架2包括两块间隔平行且沿竖直方向设置的基板6，基板6贴于支撑板5，且基板6上端弯折形成用以连接椅座的托板7，在两块基板6之间固定连接有连板8，连板8可以为多根，连板8将两块基板6连接固定，翘板3设置在两基板6之间。
在底座1两侧的支撑板5的后端、前端对称设有第一轴孔9、第二轴孔10，翘板3中部穿有第一销轴11且翘板3以第一销轴11为转动支点，所述的第一销轴11为一整根长轴，第一销轴11的两端各自依次穿过翘板3、托架2后插置在第一轴孔9内；翘板3前部的两侧对称设有第一连杆13、第二连杆14，如图2所示，由下往上所述的第一连杆13是朝着接近翘板3的方向倾斜设置，由下往上所述的第二连杆14是朝着背离翘板3的方向倾斜设置，在托架2运动过程中，第二连杆14与铅垂线的夹角始终不超过90度。
第一连杆13的一端与翘板3前端通过第四销轴16铰接，第一连杆13的另一端与第二连杆14的一端通过第三销轴15铰接且第三销轴15穿插在托架2内，第二连杆14的另一端穿有第二销轴12且第二销轴12穿过托架2并插置在第二轴孔10内，所述的第二销轴12为一整根长轴，第二销轴12的两端各自依次穿过第二连杆14、托架2后插置在第二轴孔10内；因翘板3通过连杆带动托架2运动，所以在托架2两侧的基板6上各对称开设有与第一销轴11配合的用以导引托架2运动轨迹的轨道槽17及与第二销轴12配合的用以在托架2运动时避让第二销轴12的镂空槽18，轨道槽17与镂空槽18的开设也是为了使第一销轴11、第二销轴12能够穿过托架2，由下往上所述的轨道槽17与镂空槽18均是朝着靠近翘板3的方向倾斜设置，第一销轴11、第二销轴12分别穿设在轨道槽17与镂空槽18内，轨道槽17与第一销轴11配合用以导引托架的运动轨迹，而镂空槽18仅是为了使第二销轴12穿过托架并不妨碍到托架运动。
托架2连接有弹性复位装置，所述的弹性复位装置为弹簧19，弹簧19的一端与托架2相连，弹簧19的另一端与底座1相连。具体的说，在托架2上设有一横杆20，横杆20的两端与托架2的两块基板6固定相连，弹簧19为倾斜设置，弹簧19的上端钩住横杆20，弹簧19的下端钩住底座1的前端下沿。实际使用中，可根据实际需要设置1～4根弹簧19。
如图4所示，当翘板3向后翻转时，第一销轴11、第二销轴12与底座间不产生任何相对位移，只与托架发生相对运动，翘板3前端向上拖动第一连杆13向上运动，而第一连杆13与第二连杆14铰接处的第三销轴15拉动托架2朝接近翘板3的斜上方运动，而托架2的运动轨迹就是沿着轨道槽17进行；在整个运动过程中，第二连杆14与铅垂线的夹角始终不超过90度，第三销轴15始终处于第一销轴11的铅垂线与第二销轴12的铅垂线之间。
当椅背或翘板3倾仰到最大角度时，托架2或椅座随椅背往后运动的距离为15～40mm，最佳为30mm；椅背向后倾仰的角度为10～30度，最佳为21度。
如图1、2、3、5、6、9所示，初始状态下，人坐在转椅上，在弹簧19拉力、椅座36、人体重力的作用下，托板7压在底座1的两支撑板(未图示)上，托架2的基板6完全处于底座1内部；如图10所示，当人向后倚靠椅背37的过程中，如图1、2、3、5、6、10所示，托架2会带动椅座36连动，使椅座36也跟随椅背37的转动向后移动，在这个过程中，以人体后背A处、人体臀部B处为例，人体后背A处与椅背37之间、人体臀部B处与椅座36之间始终保持相对固定，没有产生相对位移，从而避免了衣物与后背产生摩擦。
实施例2：该实施例与实施例1的不同之处在于，如图7、8所示，所述的第二销轴12为两根独立的小轴41，在底座1上对应固定设有两个支座42，每个小轴41的一端依次穿过第二连杆14、镂空槽18后插置在第二轴孔10内，每个小轴41的另一端插在相应的支座42内。这样，相对于一整根长轴的形式，可以避开弹簧19，防止对弹簧19造成阻碍。
实施例3：该实施例与实施例1的不同之处在于，如图11、12所示，托架2两侧的基板6干涉到第二轴孔10、第二销轴12的部分被切除从而使得托架2避开第二轴孔10及第二销轴12，第二销轴12直接插置在第二轴孔10内。
实施例4：本实施例的托架驱动机构与实施例1的不同之处在于，第一销轴不与轨道槽配合，而是在底座上另外设置了导轴与轨道槽配合，具体是说，该托架驱动机构包括用以连接气杆的底座、用以固定椅座的托架及用以连接椅背的翘板，托架、翘板均设置在底座内，翘板中部通过第一销轴与底座铰接，翘板的前部设有第一连杆、第二连杆，第一连杆的一端与翘板前端铰接，第一连杆的另一端与第二连杆的一端通过第三销轴铰接且第三销轴与托架相连，第二连杆的另一端通过第二销轴与底座铰接，在托架的两侧对称开设有用以导引托架运动轨迹的轨道槽，在底座上设有与轨道槽配合的导轴，所述的导轴插在轨道槽内，翘板转动通过第一、第二连杆带动托架沿轨道槽的轨迹运动。
而第一销轴穿过或避开托架后与底座相连，同样，第二销轴穿过或避开托架后与底座相连。
第一销轴穿过托架是指：在托架的两侧对称开设有与第一销轴配合的用以在托架运动时避让第一销轴的镂空槽一，第一销轴穿设在镂空槽一内；第一销轴避开托架是指：托架两侧的干涉到第一销轴的部分被切除从而使得托架避开第一销轴。
第二销轴穿过托架是指：在托架的两侧对称开设有与第二销轴配合的用以在托架运动时避让第二销轴的镂空槽二，第二销轴穿设在镂空槽二内；第二销轴避开托架是指：托架两侧的干涉到第二销轴的部分被切除从而使得托架避开第二销轴。

Claims (1)

1、 一种用于转椅底盘的托架驱动机构，其特征是：包括用以连接气杆的底座、用以固定椅座的托架及用以连接椅背的翘板，托架、翘板均设置在底座内，翘板中部通过第一销轴与底座铰接，翘板的前部设有第一连杆、第二连杆，第一连杆的一端与翘板前端铰接，第一连杆的另一端与第二连杆的一端通过第三销轴铰接且第三销轴与托架相连，第二连杆的另一端通过第二销轴与底座铰接，在托架的两侧对称开设有与第一销轴配合的用以导引托架运动轨迹的轨道槽，第一销轴穿设在轨道槽内，翘板转动通过第一、第二连杆带动托架沿轨道槽的轨迹运动。
2、 根据权利要求1所述的一种用于转椅底盘的托架驱动机构，其特征在于：第二销轴穿过或避开托架后与底座相连。
3、 根据权利要求2所述的一种用于转椅底盘的托架驱动机构，其特征在于：在托架的两侧对称开设有与第二销轴配合的用以在托架运动时避让第二销轴的镂空槽，第二销轴穿设在镂空槽内。
4、 根据权利要求2所述的一种用于转椅底盘的托架驱动机构，其特征在于：托架两侧的干涉到第二销轴的部分被切除从而使得托架避开第二销轴。
5、 根据权利要求1所述的一种用于转椅底盘的托架驱动机构，其特征在于：所述的第一销轴为一整根长轴，第一销轴的两端各自依次穿过翘板、轨道槽后与底座相连。
6、 根据权利要求1所述的一种用于转椅底盘的托架驱动机构，其特征在于：所述的第一销轴为两根独立的短轴，在底座上对应固定设有两个支架，每个短轴的一端依次穿过翘板、轨道槽后与底座相连，每个短轴的另一端插在相应的支架内。
7、 根据权利要求3所述的一种用于转椅底盘的托架驱动机构，其特征在于：所述的第二销轴为一整根长轴，第二销轴的两端各自依次穿过第二连杆、镂空槽后与底座相连。
8、 根据权利要求4所述的一种用于转椅底盘的托架驱动机构，其特征在于：所述的第二销轴为一整根长轴，第二销轴的两端各自穿过第二连杆后插置在第二轴孔内。
9、 根据权利要求3所述的一种用于转椅底盘的托架驱动机构，其特征在于：所述的第二销轴为两根独立的小轴，在底座上对应固定设有两个支座，每个小轴的一端依次穿过第二连杆、镂空槽后与底座相连，每个小轴的另一端插在相应的支座内。
10、 根据权利要求4所述的一种用于转椅底盘的托架驱动机构，其特征在于：所述的第二销轴为两根独立的小轴，在底座上对应固定设有两个支座，每个小轴的一端穿过第二连杆后与底座相连，每个小轴的另一端插在相应的支座内。
11、 根据权利要求1或5或6所述的一种用于转椅底盘的托架驱动机构，其特征在于：第一销轴与底座相连是指：在底座后端的两侧对称设有第一轴孔，第一销轴插置在第一轴孔内。
12、 根据权利要求1或2或3或4或7或8或9或10所述的一种用于转椅底盘的托架驱动机构，其特征在于：第二销轴与底座相连是指：在底座前端的两侧对称设有第二轴孔，第二销轴插置在第二轴孔内。
13、 根据权利要求1所述的一种用于转椅底盘的托架驱动机构，其特征在于：第三销轴与托架相连是指：第三销轴穿插在托架内。
14、 根据权利要求1所述的一种用于转椅底盘的托架驱动机构，其特征在于：所述的底座包括用以连接气杆的底板，在底板的左右两侧沿竖直方向各设有一支撑板，支撑板与底板固定相连，第一销轴、第二销轴是与底座的支撑板相连；所述的托架包括两块间隔平行且沿竖直方向设置的基板，基板贴于支撑板，且基板上端弯折形成用以连接椅座的托板，在两块基板之间固定连接有连板，翘板设置在两基板之间。
15、 根据权利要求1所述的一种用于转椅底盘的托架驱动机构，其特征在于：由下往上所述的第一连杆是朝着接近翘板的方向倾斜设置，由下往上所述的第二连杆是朝着背离翘板的方向倾斜设置，在托架运动过程中，第二连杆与铅垂线的夹角始终不超过90度。
16、 根据权利要求3所述的一种用于转椅底盘的托架驱动机构，其特征在于：由下往上所述的轨道槽与镂空槽均是朝着靠近翘板的方向倾斜设置。
17、 一种用于转椅底盘的托架驱动机构，其特征是：包括用以连接气杆的底座、用以固定椅座的托架及用以连接椅背的翘板，托架、翘板均设置在底座内，翘板中部通过第一销轴与底座铰接，翘板的前部设有第一连杆、第二连杆，第一连杆的一端与翘板前端铰接，第一连杆的另一端与第二连杆的一端通过第三销轴铰接且第三销轴与托架相连，第二连杆的另一端通过第二销轴与底座铰接，在托架的两侧对称开设有用以导引托架运动轨迹的轨道槽，在底座上设有与轨道槽配合的导轴，所述的导轴插在轨道槽内，翘板转动通过第一、第二连杆带动托架沿轨道槽的轨迹运动。
18、 根据权利要求17所述的一种用于转椅底盘的托架驱动机构，其特征是：第一销轴穿过或避开托架后与底座相连，同样，第二销轴穿过或避开托架后与底座相连。
19、 根据权利要求18所述的一种用于转椅底盘的托架驱动机构，其特征是：第一销轴穿过托架是指：在托架的两侧对称开设有与第一销轴配合的用以在托架运动时避让第一销轴的镂空槽一，第一销轴穿设在镂空槽一内；第一销轴避开托架是指：托架两侧的干涉到第一销轴的部分被切除从而使得托架避开第一销轴。
20、 根据权利要求18所述的一种用于转椅底盘的托架驱动机构，其特征是：第二销轴穿过托架是指：在托架的两侧对称开设有与第二销轴配合的用以在托架运动时避让第二销轴的镂空槽二，第二销轴穿设在镂空槽二内；第二销轴避开托架是指：托架两侧的干涉到第二销轴的部分被切除从而使得托架避开第二销轴。
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