WO2020042532A1 - 一种手动式汽车座椅顶腰机构及其工作方法 - Google Patents

一种手动式汽车座椅顶腰机构及其工作方法 Download PDF

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Publication number
WO2020042532A1
WO2020042532A1 PCT/CN2019/071664 CN2019071664W WO2020042532A1 WO 2020042532 A1 WO2020042532 A1 WO 2020042532A1 CN 2019071664 W CN2019071664 W CN 2019071664W WO 2020042532 A1 WO2020042532 A1 WO 2020042532A1
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WIPO (PCT)
Prior art keywords
ratchet
top waist
crossbar
rotating disk
handle
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PCT/CN2019/071664
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English (en)
French (fr)
Inventor
邓吉雄
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福州联泓交通器材有限公司
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Application filed by 福州联泓交通器材有限公司 filed Critical 福州联泓交通器材有限公司
Publication of WO2020042532A1 publication Critical patent/WO2020042532A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/64—Back-rests or cushions
    • B60N2/66—Lumbar supports

Definitions

  • the invention relates to a manual car seat top waist mechanism and a working method thereof.
  • top waist structure for supporting the driver's waist.
  • the existing top waist structure is divided into two modes of manual adjustment and electric adjustment, and manual adjustment is more common.
  • the maximum ejection point APEX of the top waist mechanism is not clear.
  • the distance between the APEX point and the seat H in the direction of the trunk line must meet a certain range in the seat ergonomic check to ensure comfort.
  • the chair factory usually matches the convenience products on the market, which causes the compatibility between the seat platform and the top waist convenience products. At present, the top waist convenience products on the market generally have high APEX points and poor comfort.
  • the object of the present invention is to provide a manual car seat top waist mechanism and a working method thereof, which can provide assistance when a user adjusts the top waist mechanism and can adjust the top waist mechanism to an appropriate position.
  • the handle can be automatically rotated and reset.
  • a manual car seat top waist mechanism including a seat back frame, a cross bar is arranged on the seat back frame, a two-way ratchet mechanism is provided at one end of the cross bar, and one end of the two-way ratchet mechanism is installed on the cross bar.
  • the other end is provided with a ratchet rotating disk that adjusts the direction of rotation of the two-way ratchet mechanism and a coil spring that can automatically reset the ratchet rotating disk.
  • the ratchet rotating disk is provided with a handle that can twist the two-way ratchet mechanism through the ratchet rotating disk.
  • a top waist mechanism is provided in the middle, and a torsion bar is provided at the other end of the cross bar for adjusting the rotation of the top waist mechanism.
  • the ratchet wheel rotating disk can be rotated, and the ratchet wheel rotating disk is in a normal position or a working state position by rotating.
  • two mounting plates are symmetrically arranged in the middle of the cross bar.
  • the backrest frame is provided with a blocking piece for fixing a power-assisted torsion bar.
  • the power-assisted torsion bar has a torque in a normal state, so that the crossbar and the top waist mechanism have a tendency to rotate forward.
  • the top waist mechanism includes a top plate, a plastic buckle and a connecting rod, the plastic buckle is installed on the top plate, one end of the connecting rod is fixed on the plastic buckle, and the other end of the connecting rod is fixed on the mounting plate.
  • Another technical solution provided by the present invention is: a working method of a manual car seat top waist mechanism, including the manual car seat top waist mechanism;
  • the top waist mechanism When the user does not adjust the top waist mechanism, the top waist mechanism is in a normal state. At this time, because the assisted torsion bar installed at one end of the crossbar has a torque, the crossbar and the top waist mechanism have a tendency to rotate forward. At this time, the ratchet wheel of the two-way ratchet mechanism is in the normal position, and the pawl of the two-way ratchet mechanism installed at the other end of the crossbar prevents the ratchet from rotating forward, so that the crossbar and the top waist mechanism remain normal;
  • the handle is connected to the ratchet rotating disk of the two-way ratchet mechanism, and the ratchet rotating disk is connected to the pawl.
  • the pawl rotates relative to the ratchet of the two-way ratchet mechanism, and does not push the ratchet to rotate.
  • the user leans on the top waist mechanism, so that the top waist mechanism and the crossbar tend to rotate backwards.
  • the ratchet of the mechanism prevents the ratchet from rotating in the reverse direction, so the top waist mechanism can maintain a comfortable position adjusted by the user at this time;
  • the ratchet rotating disk drives the ratchet rotating disk and the handle to automatically reset, the handle is connected to the ratchet rotating disk of the two-way ratchet mechanism, the ratchet rotating disk is connected to the pawl, and the pawl faces away from the ratchet of the two-way ratchet mechanism.
  • the assisted torsion bar installed at one end of the cross bar has a torque
  • the cross bar and the top waist mechanism have a tendency to rotate forward.
  • the ratchet wheel of the two-way ratchet mechanism is in the normal position.
  • the pawl of the two-way ratchet mechanism installed at the other end of the crossbar prevents the ratchet from rotating in a positive direction, so that the crossbar and the top waist mechanism remain normal.
  • the present invention has the beneficial effects that the present invention can provide assistance when a user adjusts the top waist mechanism by using a power assisted torsion bar and a two-way ratchet mechanism, and can adjust the top waist mechanism to an appropriate position after the top waist mechanism is adjusted.
  • the handle can be automatically rotated and reset.
  • the adjusting mechanism used in the present invention is a forged piece with precise matching and small idle stroke.
  • Figure 1 is a schematic diagram of the installation structure of the present invention
  • FIG. 2 is a schematic diagram of an execution mechanism of the present invention
  • FIG. 3 is a schematic diagram of a two-way ratchet mechanism according to the present invention.
  • 40-handle 50-top waist mechanism; 51-top plate; 52-plastic buckle; 53-connecting rod; 60-assisted torsion bar; 70-mounting plate; 80-baffle.
  • a manual car seat top waist mechanism includes a seat back frame 10, a cross bar 20 is provided on the seat back frame 10, and one end of the cross bar 20 is provided with a two-way ratchet mechanism 30 and a two-way ratchet.
  • One end of the mechanism 30 is mounted on the crossbar 20, and the other end is provided with a ratchet rotating disk 31 for adjusting the rotation direction of the two-way ratchet mechanism 30 and a coil spring 32 capable of automatically resetting the ratchet rotating disk 31.
  • the ratchet rotating disk 31 is provided with a ratchet The rotating disc 31 twists the handle 40 of the two-way ratchet mechanism 30.
  • a top waist mechanism 50 is provided in the middle of the crossbar 20, and the other end of the crossbar 20 is provided with a power assist torsion bar 60 for adjusting the top waist mechanism 50 for the rotation of the crossbar 20
  • the ratchet rotating disk 31 can be driven to rotate.
  • the ratchet rotating disk 31 can rotate the two-way ratchet mechanism 30 to rotate, and then the crossbar 20 and the top waist mechanism 50 can be rotated.
  • the ratchet wheel rotating disc 31 can be rotated, and the ratchet wheel rotating disc 31 is in a normal position or a working state position by rotating.
  • two mounting plates 70 are symmetrically disposed in the middle of the cross bar 20.
  • the backrest frame 10 is provided with a blocking piece 80 for fixing a power assist torsion bar 60.
  • the power assist torsion bar 60 has a torque in a normal state, so that the cross bar 20 and the top waist mechanism 50 have a tendency to rotate forward. .
  • the top waist mechanism 50 includes a top plate 51, a plastic buckle 52, and a connecting rod 53.
  • the plastic buckle 52 is mounted on the top plate 51, one end of the connecting rod 53 is fixed to the plastic buckle 52, and the other end of the connecting rod 53 It is fixed on the mounting plate 70.
  • a working method of a manual car seat top waist mechanism includes the manual car seat top waist mechanism:
  • the top waist mechanism 50 When the user does not adjust the top waist mechanism 50, the top waist mechanism 50 is in a normal state. At this time, because the assisting torsion bar 60 installed at one end of the crossbar 20 has a torque, the crossbar 20 and the top waist mechanism 50 have a direction. The forward rotation trend, at this time, the ratchet wheel 31 of the two-way ratchet mechanism 30 is in the normal position, and the pawl of the two-way ratchet mechanism 30 installed at the other end of the crossbar 20 prevents the ratchet from rotating forward, so that the crossbar 20 and the top waist mechanism 50 Keep the norm
  • the ratchet rotating disk 31 is driven by the coil spring 32 to drive the ratchet rotating disk 31 and the handle 40 to automatically reset.
  • the handle 40 is connected to the ratchet rotation disc 31 of the two-way ratchet mechanism 30, and the ratchet rotation disc 31 is connected to the pawl.
  • the pawl is relatively turned away from the ratchet of the two-way ratchet mechanism 30, and does not push the ratchet to rotate, and the user leans against the top at this time.
  • the top waist mechanism 50 and the cross bar 20 have a tendency to rotate backward, but since the ratchet of the two-way ratchet mechanism 30 prevents the ratchet from rotating in the reverse direction, the top waist mechanism 50 can keep Staff adjustable comfort position;
  • the ratchet wheel 31 is driven by the coil spring 32 to automatically reset the ratchet wheel 31 and the handle 40.
  • the handle 40 is connected to the ratchet wheel 31 of the two-way ratchet mechanism 30
  • the ratchet rotating disc 31 is connected to the pawl, and the pawl is relatively turned to the ratchet of the two-way ratchet mechanism 30 without pushing the ratchet to rotate.
  • the torsion bar 60 installed at one end of the crossbar 20 has a torque
  • the crossbar 20 and the The top waist mechanism 50 has a tendency to rotate forward.
  • the ratchet rotating disk 31 of the two-way ratchet mechanism 30 is in a normal position, and the pawl of the two-way ratchet mechanism 30 installed at the other end of the crossbar 20 prevents the ratchet from turning forward. To keep the crossbar 20 and the top waist mechanism 50 in a normal state.

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Seats For Vehicles (AREA)

Abstract

一种手动式汽车座椅顶腰机构及一种手动式汽车座椅顶腰机构的工作方法，手动式汽车座椅顶腰机构包括椅背骨架（10），在椅背骨架（10）上设置有横杆（20），横杆（20）一端设置有双向棘轮机构（30），双向棘轮机构（30）一端安装于横杆（20）上，另一端设置有调节双向棘轮机构（30）转动方向的棘轮旋转盘（31）和能使棘轮旋转盘（31）自动复位的卷簧（32），在棘轮旋转盘（31）上设置有可通过棘轮旋转盘（31）扭动双向棘轮机构（30）的把手（40），在横杆（20）中部设置有顶腰机构（50），横杆（20）的另一端设置有调节顶腰机构（50）时为横杆（20）的转动助力的助力扭杆（60）。

Description

一种手动式汽车座椅顶腰机构及其工作方法 技术领域
本发明涉及一种手动式汽车座椅顶腰机构及其工作方法。
 背景技术
在大部分的汽车座椅上均有一个用于支撑驾驶员腰部的顶腰结构，现有的顶腰结构分为手动调节和电动调节两种模式，其中手动调节的较为普遍。
 技术问题
对于现有的手动顶腰调节机构来说，往往存在以下问题：
（1）当人坐在座椅上时，很难转动调节把手，并且由于调节机构内大多使用塑料件，在使用一定时间后存在磨损变形，导致机构间配合的间隙增大，使人们在转动调节把手时会出现一段空行程，使人们操作不便；
（2）现有的手动调节把手在调节后不能归位，在调节旋转至某一些角度时，往往会从椅背侧面突出成为突出物，当汽车遇到险情时，该手动调节把手就会影响座椅侧气囊爆破的及时性，使汽车存在安全隐患，同时从座椅背后凸出的调节把手也在一定程度上影响汽车内饰的美观；
（3）在当前市面上流行的顶腰机构，顶出方式多为收缩—挠曲顶出，一定程度上受限于座椅背骨架高度，经对比调查，现品最大顶出行程均在15~35mm，扣除椅背发泡吸收量，实际有效行程为7~22mm之间，效果较不理想，同时由于存在空行程的影响，实际的有效行程更小；
（4）顶腰机构最大顶出点APEX点不明确，该APEX点与座椅H点在躯干线方向的距离值在座椅人机工程校核中须符合一定的范围才能保证舒适性，座椅厂通常匹配市面上的便品，这就出现了座椅平台与顶腰便品兼容性问题，目前市面上的顶腰便品，其APEX 点普遍偏高，舒适性不佳。
 技术解决方案
有鉴于此，本发明的目的在于提供了一种手动式汽车座椅顶腰机构及其工作方法，能在使用人员调节顶腰机构时提供助力，并能在顶腰机构调节至合适位置后，把手能自动旋转复位。
本发明的技术方案是：一种手动式汽车座椅顶腰机构，包括椅背骨架，在椅背骨架上设置有横杆，横杆一端设置有双向棘轮机构，双向棘轮机构一端安装于横杆上，另一端设置有调节双向棘轮机构转动方向的棘轮旋转盘和能使棘轮旋转盘自动复位的卷簧,在棘轮旋转盘设置有可通过棘轮旋转盘扭动双向棘轮机构的把手，在横杆中部设置有顶腰机构，横杆的另一端设置有调节顶腰机构时为横杆转动助力的助力扭杆。
进一步的，所述棘轮旋转盘可以进行转动，通过转动使棘轮旋转盘处于常态位置或工作状态位置。
进一步的，在横杆的中部对称设置有两个安装板。
进一步的，在椅背骨架上设置有固定助力扭杆的挡片，所述助力扭杆在常态下具有扭力，使横杆和顶腰机构具有向前转动的趋势。
进一步的，所述顶腰机构包括顶板、塑胶扣和连接杆，所述塑胶扣安装在顶板上，连接杆一端固定于塑胶扣上，连接杆另一端固定于安装板上。
本发明提供的另一种技术方案是；一种手动式汽车座椅顶腰机构的工作方法，包括所述的手动式汽车座椅顶腰机构；
（1）当使用人员没有对顶腰机构进行调节时，顶腰机构处于常态，这时由于安装在横杆一端助力扭杆具有扭力，使横杆和顶腰机构具有向前转动的趋势，此时双向棘轮机构的棘轮旋转盘处于常态位置，安装在横杆另一端的双向棘轮机构的棘爪阻止棘轮正向转动，使横杆和顶腰机构保持常态；
（2）当使用人员需要对顶腰机构进行顶出调节时，这时正向转动把手，把手与双向棘轮机构的棘轮旋转盘相连，棘轮旋转盘带动棘爪正向推动双向棘轮机构的棘轮转动，为横杆和顶腰机构向前转动提供力的作用，同时助力扭杆也为横杆和顶腰机构向前转动提供助力，使用人员在旋转把手时更加省力，当使用人员将顶腰机构调整至合适位置时，松开把手，这时棘轮旋转盘由于受到卷簧的作用,带动棘轮旋转盘和把手自动复位，把手与双向棘轮机构的棘轮旋转盘相连，棘轮旋转盘与棘爪相连，棘爪背向双向棘轮机构的棘轮进行相对转动，不推动棘轮转动，而此时使用人员靠在顶腰机构上，使顶腰机构和横杆有向后转动的趋势，但是由于此时双向棘轮机构的棘爪阻止棘轮反向转动，所以此时顶腰机构能够保持使用人员调节的舒适位置；
（3）当使用人员需要将顶腰机构向后调节时，反向转动把手，这时双向棘轮机构的棘爪阻止棘轮正向转动，可以反向转动，把手与双向棘轮机构的棘轮旋转盘相连，棘轮旋转盘与棘爪相连，带动棘爪反向推动双向棘轮机构的棘轮转动，为横杆和顶腰机构向后转动提供力的作用，当使用人员将回调至合适位置时，松开把手，这时棘轮旋转盘由于受到卷簧的作用,带动棘轮旋转盘和把手自动复位，把手与双向棘轮机构的棘轮旋转盘相连，棘轮旋转盘与棘爪相连，棘爪背向双向棘轮机构的棘轮进行相对转动，不推动棘轮转动，这时由于安装在横杆一端助力扭杆具有扭力，使横杆和顶腰机构具有向前转动的趋势，此时双向棘轮机构的棘轮旋转盘处于常态位置，安装在横杆另一端的双向棘轮机构的棘爪阻止棘轮正向转动，使横杆和顶腰机构保持常态。
 有益效果
与现有技术相比，本发明的有益效果是：本发明通过使用助力扭杆和双向棘轮机构配合，能在使用人员调节顶腰机构时提供助力，并能在顶腰机构调节至合适位置后，把手能自动旋转复位，同时本发明使用的调节机构均为锻造件，搭配精密，空行程小。
为使得本发明的上述目的、特征和优点能够更明显易懂，下面结合附图对本发明的具体实施方式做详细说明。
 附图说明
图1为本发明的安装结构示意图；
图2为本发明执行机构示意图；
图3为本发明双向棘轮机构示意图；
图中：10-椅背骨架；20-横杆；30-双向棘轮机构；31-棘轮旋转盘；32-卷簧；
40-把手；50-顶腰机构；51-顶板；52-塑胶扣；53-连接杆；60-助力扭杆；70-安装板；80-挡片。
 本发明的实施方式
如图1~3所示，一种手动式汽车座椅顶腰机构，包括椅背骨架10，在椅背骨架10上设置有横杆20，横杆20一端设置有双向棘轮机构30，双向棘轮机构30一端安装于横杆20上，另一端设置有调节双向棘轮机构30转动方向的棘轮旋转盘31和能使棘轮旋转盘31自动复位的卷簧32,在棘轮旋转盘31设置有可通过棘轮旋转盘31扭动双向棘轮机构30的把手40，在横杆20中部设置有顶腰机构50，横杆20的另一端设置有调节顶腰机构50时为横杆20转动助力的助力扭杆60，可通过调节把手40，带动棘轮旋转盘31转动，棘轮旋转盘31转动带动双向棘轮机构30转动，进而带动横杆20和顶腰机构50转动。
本实施例中，所述棘轮旋转盘31可以进行转动，通过转动使棘轮旋转盘31处于常态位置或工作状态位置。
本实施例中，在横杆20的中部对称设置有两个安装板70。
本实施例中，在椅背骨架10上设置有固定助力扭杆60的挡片80，所述助力扭杆60在常态下具有扭力，使横杆20和顶腰机构50具有向前转动的趋势。
本实施例中，所述顶腰机构50包括顶板51、塑胶扣52和连接杆53，所述塑胶扣52安装在顶板51上，连接杆53一端固定于塑胶扣52上，连接杆53另一端固定于安装板70上。
一种手动式汽车座椅顶腰机构的工作方法，包括所述的手动式汽车座椅顶腰机构：
（1）当使用人员没有对顶腰机构50进行调节时，顶腰机构50处于常态，这时由于安装在横杆20一端助力扭杆60具有扭力，使横杆20和顶腰机构50具有向前转动的趋势，此时双向棘轮机构30的棘轮旋转盘31处于常态位置，安装在横杆20另一端的双向棘轮机构30的棘爪阻止棘轮正向转动，使横杆20和顶腰机构50保持常态；
（2）当使用人员需要对顶腰机构50进行顶出调节时，这时正向转动把手40，把手40与双向棘轮机构30的棘轮旋转盘31相连，棘轮旋转盘31带动棘爪正向推动双向棘轮机构30的棘轮转动，为横杆20和顶腰机构50向前转动提供力的作用，同时助力扭杆60也为横杆20和顶腰机构50向前转动提供助力，使用人员在旋转把手40时更加省力，当使用人员将顶腰机构50调整至合适位置时，松开把手40，这时棘轮旋转盘31由于受到卷簧32的作用,带动棘轮旋转盘31和把手40自动复位，把手40与双向棘轮机构30的棘轮旋转盘31相连，棘轮旋转盘31与棘爪相连，棘爪背向双向棘轮机构30的棘轮进行相对转动，不推动棘轮转动，而此时使用人员靠在顶腰机构50上，使顶腰机构50和横杆20有向后转动的趋势，但是由于此时双向棘轮机构30的棘爪阻止棘轮反向转动，所以此时顶腰机构50能够保持使用人员调节的舒适位置；
（3）当使用人员需要将顶腰机构50向后调节时，反向转动把手40，这时双向棘轮机构30的棘爪阻止棘轮正向转动，可以反向转动，把手40与双向棘轮机构30的棘轮旋转盘31相连，棘轮旋转盘31与棘爪相连，带动棘爪反向推动双向棘轮机构30的棘轮转动，为横杆20和顶腰机构50向后转动提供力的作用，当使用人员将回调至合适位置时，松开把手40，这时棘轮旋转盘31由于受到卷簧32的作用,带动棘轮旋转盘31和把手40自动复位，把手40与双向棘轮机构30的棘轮旋转盘31相连，棘轮旋转盘31与棘爪相连，棘爪背向双向棘轮机构30的棘轮进行相对转动，不推动棘轮转动，这时由于安装在横杆20一端助力扭杆60具有扭力，使横杆20和顶腰机构50具有向前转动的趋势，此时双向棘轮机构30的棘轮旋转盘31处于常态位置，安装在横杆20另一端的双向棘轮机构30的棘爪阻止棘轮正向转动，使横杆20和顶腰机构50保持常态。
上述操作流程及软硬件配置，仅作为本发明的较佳实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等同变换，或直接或间接运用在相关技术领域，均同理包括在本发明的专利保护范围内。

Claims (6)

  1. 一种手动式汽车座椅顶腰机构，其特征在于：包括椅背骨架，在椅背骨架上设置有横杆，横杆一端设置有双向棘轮机构，双向棘轮机构一端安装于横杆上，另一端设置有调节双向棘轮机构转动方向的棘轮旋转盘和能使棘轮旋转盘自动复位的卷簧,在棘轮旋转盘设置有可通过棘轮旋转盘扭动双向棘轮机构的把手，在横杆中部设置有顶腰机构，横杆的另一端设置有调节顶腰机构时为横杆转动助力的助力扭杆。
  2. 根据权利要求1所述的手动式汽车座椅顶腰机构，其特征在于：所述棘轮旋转盘可以进行转动，通过转动使棘轮旋转盘处于常态位置或工作状态位置。
  3. 根据权利要求1所述的手动式汽车座椅顶腰机构，其特征在于：在横杆的中部对称设置有两个安装板。
  4. 根据权利要求1所述的手动式汽车座椅顶腰机构，其特征在于：在椅背骨架上设置有固定助力扭杆的挡片，所述助力扭杆在常态下具有扭力，使横杆和顶腰机构具有向前转动的趋势。
  5. 根据权利要求3所述的手动式汽车座椅顶腰机构，其特征在于：所述顶腰机构包括顶板、塑胶扣和连接杆，所述塑胶扣安装在顶板上，连接杆一端固定于塑胶扣上，连接杆另一端固定于安装板上。
  6. 一种手动式汽车座椅顶腰机构的工作方法，包括如权利要求1所述的手动式汽车座椅顶腰机构，其特征在于：
    （1）当使用人员没有对顶腰机构进行调节时，顶腰机构处于常态，这时由于安装在横杆一端助力扭杆具有扭力，使横杆和顶腰机构具有向前转动的趋势，此时双向棘轮机构的棘轮旋转盘处于常态位置，安装在横杆另一端的双向棘轮机构的棘爪阻止棘轮正向转动，使横杆和顶腰机构保持常态；
    （2）当使用人员需要对顶腰机构进行顶出调节时，这时正向转动把手，把手与双向棘轮机构的棘轮旋转盘相连，棘轮旋转盘带动棘爪正向推动双向棘轮机构的棘轮转动，为横杆和顶腰机构向前转动提供力的作用，同时助力扭杆也为横杆和顶腰机构向前转动提供助力，使用人员在旋转把手时更加省力，当使用人员将顶腰机构调整至合适位置时，松开把手，这时棘轮旋转盘由于受到卷簧的作用,带动棘轮旋转盘和把手自动复位，把手与双向棘轮机构的棘轮旋转盘相连，棘轮旋转盘与棘爪相连，棘爪背向双向棘轮机构的棘轮进行相对转动，不推动棘轮转动，而此时使用人员靠在顶腰机构上，使顶腰机构和横杆有向后转动的趋势，但是由于此时双向棘轮机构的棘爪阻止棘轮反向转动，所以此时顶腰机构能够保持使用人员调节的舒适位置；
    （3）当使用人员需要将顶腰机构向后调节时，反向转动把手，这时双向棘轮机构的棘爪阻止棘轮正向转动，可以反向转动，把手与双向棘轮机构的棘轮旋转盘相连，棘轮旋转盘与棘爪相连，带动棘爪反向推动双向棘轮机构的棘轮转动，为横杆和顶腰机构向后转动提供力的作用，当使用人员将回调至合适位置时，松开把手，这时棘轮旋转盘由于受到卷簧的作用,带动棘轮旋转盘和把手自动复位，把手与双向棘轮机构的棘轮旋转盘相连，棘轮旋转盘与棘爪相连，棘爪背向双向棘轮机构的棘轮进行相对转动，不推动棘轮转动，这时由于安装在横杆一端助力扭杆具有扭力，使横杆和顶腰机构具有向前转动的趋势，此时双向棘轮机构的棘轮旋转盘处于常态位置，安装在横杆另一端的双向棘轮机构的棘爪阻止棘轮正向转动，使横杆和顶腰机构保持常态。
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