WO2025185524A1 - 用于可升降座椅的机械伸展装置和可升降座椅 - Google Patents

用于可升降座椅的机械伸展装置和可升降座椅

Info

Publication number
WO2025185524A1
WO2025185524A1 PCT/CN2025/079765 CN2025079765W WO2025185524A1 WO 2025185524 A1 WO2025185524 A1 WO 2025185524A1 CN 2025079765 W CN2025079765 W CN 2025079765W WO 2025185524 A1 WO2025185524 A1 WO 2025185524A1
Authority
WO
WIPO (PCT)
Prior art keywords
outward
turning
link
mounting plate
hinge point
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
PCT/CN2025/079765
Other languages
English (en)
French (fr)
Other versions
WO2025185524A8 (zh
Inventor
雷晓春
李晓鸿
宋刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Remacro Technology Co Ltd
Original Assignee
Remacro Technology Co Ltd
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
Priority claimed from CN202410265705.XA external-priority patent/CN118021081A/zh
Priority claimed from CN202420449955.4U external-priority patent/CN222285050U/zh
Application filed by Remacro Technology Co Ltd filed Critical Remacro Technology Co Ltd
Publication of WO2025185524A1 publication Critical patent/WO2025185524A1/zh
Publication of WO2025185524A8 publication Critical patent/WO2025185524A8/zh
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/02—Seat parts
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Supports for the head or the back
    • A47C7/40—Supports for the head or the back for the back
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Supports for the head or the back
    • A47C7/40—Supports for the head or the back for the back
    • A47C7/46—Supports for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/50—Supports for the feet or the legs

Definitions

  • the present application relates to a mechanical extension device for a liftable seat and a liftable seat comprising the mechanical extension device.
  • the technical problem to be solved by this application is how to provide a seat that maintains a good user experience and comprehensive functionality while having a compact structure.
  • the liftable seat includes a seat portion, a backrest and a footrest.
  • the mechanical extension device includes:
  • the linkage mechanism comprising a seat mounting plate, a backrest bracket, and a leg assembly, wherein the leg assembly comprises a footrest mounting plate and an outward turning assembly;
  • a lifting assembly is arranged between the base and the linkage mechanism, wherein the seat mounting plate can be moved between a sitting position and a raised position by means of the lifting assembly.
  • the linkage mechanism enables the mechanical extension device to be shifted between at least a sitting position and a reclining position.
  • the front end of the outward-facing assembly In the reclining position, the front end of the outward-facing assembly is located forward of the footrest mounting plate, and the backrest bracket is tilted rearward relative to the seat mounting plate.
  • the front end of the outward-facing assembly is at least 490 mm above the ground. In some embodiments, in the reclining position, the front end of the outward-facing assembly is at least 550 mm above the ground.
  • the backrest bracket and the backrest attached thereto are generally pointed upward, the leg assembly is folded, and the footrest attached to the leg assembly is folded under the seat portion.
  • the backrest bracket and the backrest attached thereto are significantly tilted rearward compared to the reclining position, the leg assembly is extended forward and upward, and the footrest attached to the leg assembly is raised forward and upward.
  • the leg assembly's folding assembly is unfolded, so that the front end of the folding assembly is located in front of the footrest mounting plate, thereby extending the support portion for the user's lower limbs, especially at least the feet and/or calves, providing a better user experience.
  • the folding assembly itself is only unfolded during the transition from the sitting position to the reclining position and remains folded in the sitting position, a more compact structure is provided.
  • the outward-turning assembly includes a first outward-turning link, a second outward-turning link, a third outward-turning link and an outward-turning drive rod, wherein a four-bar linkage is formed by the footrest mounting plate, the first outward-turning link, the second outward-turning link and the third outward-turning link, and wherein the four-bar linkage can be driven to deform by the outward-turning drive rod, so that the front end of the outward-turning assembly is located in front of the footrest mounting plate.
  • the leg assembly further includes a first leg link, a second leg link, a third leg link and a fourth leg link, wherein the front ends of the third leg link and the fourth leg link are respectively hinged to the footrest mounting plate, wherein the front end of the outward-turning drive rod is hinged to the four-bar linkage, and the rear end of the outward-turning drive rod is hinged to the fourth leg link at a first hinge point.
  • the first outward-turning link includes a second hinge point arranged on its first free end, a fourth hinge point arranged on its second free end, and a third hinge point located between the second hinge point and the fourth hinge point, wherein the first outward-turning link is hinged to the outward-turning drive rod at the second hinge point, is hinged to the footrest mounting plate at the third hinge point, and is hinged to the third outward-turning link at the fourth hinge point.
  • the outward drive rod causes the second free end of the first outward link to pivot upward around the third hinge point.
  • the first outward-turning connecting rod is configured as a bell crank, wherein a line connecting the second hinge point and the fourth hinge point is located in front of the third hinge point.
  • two ends of the second outward-turned connecting rod are hinged to the front end of the footrest mounting plate and the third outward-turned connecting rod respectively.
  • the angle of the front side of the backrest support to the horizontal plane is at most 22°. In some embodiments, in the lying position, the angle of the front side of the backrest support to the horizontal plane is at most 13°.
  • the leg assembly in the sitting position, is retracted relative to the seat mounting plate.
  • the seat mounting plate in the raised position, is raised and tilted forward relative to the base, and the leg assembly is folded relative to the seat mounting plate, wherein the lifting assembly can sequentially shift the mechanical extension device from a lying position, a sitting position to a raised position, and reversely shift the mechanical extension device sequentially from a raised position, a sitting position to a lying position.
  • the present application also provides a liftable chair.
  • the liftable chair includes a mechanical extension device, a seat portion attached to the mechanical extension device, a backrest, and a footrest.
  • the mechanical extension device includes:
  • the linkage mechanism comprising a seat mounting plate attached to the seat portion, a backrest bracket attached to the backrest, and a leg assembly attached to the footrest, wherein the leg assembly comprises a footrest mounting plate and an outward turning assembly;
  • a lifting assembly is arranged between the base and the linkage mechanism, wherein the seat mounting plate can be moved between a sitting position and a raised position by means of the lifting assembly.
  • the linkage mechanism enables the mechanical extension device to be shifted between at least a sitting position and a reclining position.
  • the front end of the outward-facing assembly In the reclining position, the front end of the outward-facing assembly is located forward of the footrest mounting plate, and the backrest bracket is tilted rearward relative to the seat mounting plate.
  • the front end of the outward-facing assembly is at least 490 mm above the ground. In some embodiments, in the reclining position, the front end of the outward-facing assembly is at least 550 mm above the ground.
  • the outward-turning assembly includes a first outward-turning link, a second outward-turning link, a third outward-turning link and an outward-turning drive rod, wherein a four-bar linkage is formed by the footrest mounting plate, the first outward-turning link, the second outward-turning link and the third outward-turning link, and wherein the four-bar linkage can be driven to deform by the outward-turning drive rod, so that the front end of the outward-turning assembly is located in front of the footrest mounting plate.
  • the leg assembly further includes a first leg link, a second leg link, a third leg link and a fourth leg link, wherein the front ends of the third leg link and the fourth leg link are respectively hinged to the footrest mounting plate, wherein the front end of the outward-turning drive rod is hinged to the four-bar linkage, and the rear end of the outward-turning drive rod is hinged to the fourth leg link at a first hinge point.
  • the first outward-turning link includes a second hinge point arranged on its first free end, a fourth hinge point arranged on its second free end, and a third hinge point located between the second hinge point and the fourth hinge point, wherein the first outward-turning link is hinged to the outward-turning drive rod at the second hinge point and is hinged to the third outward-turning link at the fourth hinge point.
  • the outward drive rod causes the second free end of the first outward link to pivot upward around the third hinge point.
  • two ends of the second outward-turned connecting rod are hinged to the front end of the footrest mounting plate and the third outward-turned connecting rod respectively.
  • the footrest in the sitting position, the footrest is tucked under the seat portion.
  • the seat mounting plate in the raised position, is raised and tilted forward relative to the base, and the seat portion is folded under the seat portion, wherein the lifting assembly enables the mechanical extension device to be sequentially transformed from a lying position, a sitting position to a raised position, and the mechanical extension device to be reversely transformed from a raised position, a sitting position to a lying position.
  • FIG1 schematically shows a perspective view of a mechanical extension device for a liftable seat according to one embodiment of the present application, which is in a lying position;
  • FIG2 schematically shows in perspective the mechanical extension device shown in FIG1 in a sitting position
  • FIG3 schematically shows, in side view, the raised position of the mechanical stretching device shown in FIG1 ;
  • FIG4 schematically shows a side view of the mechanical extension device shown in FIG1 in a sitting position
  • FIG5 schematically illustrates, in side view, the TV posture position of the mechanical stretching device shown in FIG1 ;
  • FIG6 schematically shows, in side view, the lying position of the mechanical stretching device shown in FIG1 ;
  • FIG7 schematically shows a partial enlarged view of the leg assembly of the mechanical extension device shown in FIG1 ;
  • FIG8 schematically shows a partial enlarged view of the leg assembly shown in FIG7 from another angle.
  • references to "one embodiment” or “an embodiment” herein refer to specific features, structures, or characteristics that may be included in at least one implementation of the present application.
  • the terms “upper,” “lower,” “left,” “right,” “top,” “bottom,” and the like, indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplification. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and are therefore not to be construed as limiting the present application.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly specifying the number of the technical features referred to. Thus, a feature designated “first” or “second” may explicitly or implicitly include one or more of such features. Furthermore, the terms “first,” “second,” and the like are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that such terms are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.
  • FIG1 schematically illustrates in perspective a mechanical extension device 1 for a height-adjustable chair according to an embodiment of the present application.
  • the height-adjustable chair includes a seat portion, a backrest, and a footrest (not shown) attached to the mechanical extension device 1.
  • FIG1 shows the mechanical extension device 1 in a reclining position
  • FIG2 shows the mechanical extension device 1 in a sitting position.
  • the mechanical extension device 1 includes a base 10 , a linkage mechanism 11 , a lifting assembly 12 and an electric drive unit 13 .
  • the base 10 includes a rear base crossbeam 101 extending in the transverse direction of the liftable seat, a front base crossbeam 102, and two base longitudinal beams 103 extending in the longitudinal direction and spaced apart from each other on the left and right sides.
  • the front base crossbeam 101, the rear base crossbeam 102, and the base longitudinal beams 103 form a rectangular base 10.
  • a linkage mechanism 11 is movably arranged above the base 10 .
  • the linkage mechanism 11 is constructed as a multi-link mechanism and includes a supporting frame 110 , a seat assembly 111 , a backrest assembly 112 and a leg assembly 113 .
  • the supporting frame 110 is generally constructed as a rectangular frame and includes two supporting longitudinal beams 1100 extending longitudinally of the movable seat and spaced apart from each other on the left and right sides, and a front supporting cross beam 1106 and a rear supporting cross beam 1107 extending between and connecting the two supporting longitudinal beams 1100.
  • the front supporting cross beam 1106 includes a front extension 1101.
  • a rear extension 1102 is included.
  • front extension 1101 can be either a part of the front load-bearing crossbeam 1106 or a component fixedly connected to the front load-bearing crossbeam 1106.
  • the rear extension 1102 can be either a part of the load-bearing longitudinal beam 1100 or a component fixedly connected to the load-bearing longitudinal beam 1100.
  • the seat assembly 111 includes an L-shaped seat mounting member 1110, a front end mounting member 1111 constructed on the front end of the seat mounting member 1110, a seat front swing link 1112, a seat rear swing link 1113, a drive link 1114 and a laterally extending motor drive rod 1115.
  • the seat mounting member 1110 is used to attach the seat.
  • the front mounting member 1111 is fixedly connected to the seat mounting member 1110 or is configured as a protrusion protruding upward from the front end of the seat mounting member 1110.
  • a drive link 1114 is pivotally connected at one end to the front mounting member 111 and at its other end to drive rod protrusions 1115a protruding from both ends of the motor drive rod 1115.
  • the front seat swing link 1112 is configured as a bell crank member. One free end is pivotally connected to the front end of the seat mounting member 1110 and the other free end is at least indirectly pivotally connected to the leg assembly 113 via the leg drive rod 1116.
  • the rear seat swing link 1113 is pivotally connected at one end to the rear end of the seat mounting member 1110 and at least indirectly pivotally connected to the support frame 110, particularly the support longitudinal beam 1100, at its other end.
  • the seat assembly 111 is movably connected to the supporting frame 110 via a transmission mechanism.
  • the transmission mechanism includes a first transmission rod 1103, a second transmission rod 1104, and a third transmission rod 1105.
  • the middle portion of the front seat swing link 1112 is pivotally connected to the front end of the first transmission rod 1103, the rear end of the first transmission rod 1103 is pivotally connected to the front end of the second transmission rod 1104, and the middle portion of the first transmission rod 1103 is pivotally connected to the supporting longitudinal beam 1100, particularly the rear end extension 1102 of the supporting longitudinal beam.
  • the rear end of the second transmission rod 1104 is pivotally connected to the lower end of the third transmission rod 1105, the upper end of the third transmission rod 1105 is pivotally connected to the lower end of the rear seat swing link 1113, and the middle portion of the third transmission rod 1105 is pivotally connected to the supporting longitudinal beam 1100, particularly the rear end extension 1102 of the supporting longitudinal beam.
  • the backrest assembly 112 includes a backrest bracket 1120 and a backrest link 1121.
  • the backrest bracket 1120 is used to attach the backrest, and the front end of the backrest bracket 1120 is pivotally connected to the upper end of the seat mounting member 1110, the rear end of the backrest bracket 1120 is pivotally connected to the upper end of the backrest link 1121, and the lower end of the backrest link 1121 is pivotally connected to the load-bearing longitudinal beam 1100, in particular, the rear end extension 1102 of the load-bearing longitudinal beam.
  • the leg assembly 113 is constructed as a multi-link mechanism and includes a first leg link 1131 , a second leg link 1132 , a third leg link 1133 , a fourth leg link 1134 , a pedal mounting plate 1135 for attaching a pedal, and an outward rotation assembly pivotally connected to the pedal mounting plate 1135 .
  • the rear end of the first leg link 1131 is pivotally connected to the middle portion of the seat front swing link 1112, and the front end of the first leg link 1131 is pivotally connected to the rear end of the fourth leg link 1134.
  • the rear end of the second leg link 1132 is pivotally connected to the front end of the seat mounting member 1110, and the front end of the second leg link 1132 is pivotally connected to the rear end of the third leg link 1133.
  • the front ends of the third leg link 1133 and the fourth leg link 1134 are both pivotally connected to the footrest mounting plate 1135.
  • the middle portion of the second leg link 1132 is also hingedly connected to the middle portion of the fourth leg link 1134.
  • the first outward-turning link 1136 is configured as a bell crank, wherein the first outward-turning link 1136 includes a second hinge point P2 at its first free end, a fourth hinge point P4 at its second free end, and a third hinge point P3 located between the second hinge point P2 and the fourth hinge point P4.
  • the line connecting the second hinge point P2 and the fourth hinge point P4 is located forward of the third hinge point P3.
  • the outward-turning drive rod 1139 includes a front end and a rear end that are generally opposed to each other in the front-to-back direction.
  • the rear end of the outward-turning drive rod 1139 is pivotally connected to the fourth leg link 1134 of the leg assembly 113 at a first hinge point P1, and the front end is hingedly connected to the first outward-turning link 1136 at a second hinge point P2.
  • the first outward-turning link 1136 is hingedly connected to the front extension 1135a of the footrest at a third hinge point P3 and to the third outward-turning link 1138 at a fourth hinge point P4.
  • One end of the second outward-turning link 1137 is hingedly connected to the front extension 1135a of the footrest, and the other end is hingedly connected to the third outward-turning link 1138.
  • the second outward-turning link 1137 is hingedly connected to the front extension 1135a of the footrest more forward than the third hinge point P3.
  • the outward-turning drive rod 1139 causes the second free end of the first outward-turning link 1136 to pivot upward around the third hinge point P3, thereby causing the four-bar linkage composed of the footrest mounting plate 1135, the first outward-turning link 1136, the second outward-turning link 1137 and the third outward-turning link 1138 to deform through the outward-turning drive rod 1139, so that the front end of the outward-turning assembly is located in front of the footrest mounting plate 1135.
  • the lifting mechanism 12 includes a lifting base 120, a first lifting link 121, and a second lifting link 122.
  • the lifting base 120 is fixedly mounted on the base longitudinal beam 101 of the base 10.
  • the first lifting link 121 and the second lifting link 122 are each hinged at one end to the lifting base 120 and at the other end to the supporting frame 110, specifically, to a front extension 1101 fixedly connected to the front supporting crossbeam 1106.
  • the lifting base 120, the first lifting link 121, the second lifting link 122, and the front extension 1101 form a four-bar linkage.
  • This modification of the four-bar linkage enables the supporting frame 110 to be raised and lowered relative to the base 10, thereby driving the seat assembly 111, the backrest assembly 112, and the leg assembly 113 connected to the supporting frame 110 to be raised and lowered relative to the base 10.
  • the second lifting link 122 is configured with a lifting stop plate 1220 on the side thereof facing the base 10. When the lifting mechanism 12 is not lifted, the lifting stop plate 1220 abuts against the upper surface of the base longitudinal beam 103 with its lower surface.
  • an electric drive unit 13 is also provided.
  • the electric drive unit 13 comprises a single electric motor.
  • the electric motor can be configured as a push rod motor, comprising a motor head connected to the rear base crossbeam 101 and a motor push rod that is retractable relative to the motor head.
  • the motor push rod is connected to the motor drive rod 1115.
  • the electric drive unit 13 can cause the liftable seat to be sequentially changed from a lying position to a sitting position and a raised position, or vice versa, from a raised position to a sitting position and a lying position.
  • the electric drive unit 13 may also include two motors, one of which causes the liftable seat to change between a sitting position and a lying position, and the other motor causes the liftable seat to change between a raised position and a sitting position and/or a lying position.
  • the motor push rod continues to retract relative to the motor head.
  • This causes the motor drive rod 1115 to flip, which in turn causes the drive link 1114 to pivot, prompting the front mounting member 1111 to push the seat mounting member 1110 backward.
  • the backrest assembly 112 tilts backward, and under the action of the transmission mechanism, the seat front swing arm 1112 pivots, causing the leg drive rod 1116 to move forward, pushing the leg assembly 113 to unfold.
  • the outward drive rod 1139 causes the second free end of the first outward link 1136 to pivot upward around the third hinge point P3, so that the front end of the outward assembly is located in front of the footrest mounting plate 1135.
  • the height H of the front end of the eversion assembly relative to the ground is at least 490 mm, and in some embodiments is 550 mm; the angle ⁇ of the front side of the backrest bracket 1120 with the horizontal plane is at most 22°, and in some embodiments is at most 13°.

Landscapes

  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Passenger Equipment (AREA)

Abstract

本发明提供一种用于可升降座椅的机械伸展装置，可升降座椅包括坐席部、靠背和脚踏，机械伸展装置包括：固定支撑在地面上的底座；可活动地布置在底座上方的联动机构，联动机构包括座部安装板、靠背支架和腿部组件，其中，腿部组件包括脚踏安装板和外翻组件；和布置在底座与联动机构之间的升降组件，其中，通过升降组件能够使座部安装板在坐姿位置与抬升位置之间变换。

Description

用于可升降座椅的机械伸展装置和可升降座椅 技术领域
本申请涉及一种用于可升降座椅的机械伸展装置以及包括所述机械伸展装置的可升降座椅。
背景技术
随着生活水平的提高，以及人们对家居用品的日臻细致化的需求，可活动座椅的功能越来越多样化。例如“老人椅”在具有常见的坐姿位置和躺姿位置之外，还具有所谓的“抬升位置”。在抬升位置中，老人椅的坐席部能够相对于地面升高和向前倾斜，以便辅助使用者起身。然而，随着功能的多样化，也带来了结构上的复杂化。这一方面会导致所需零件增多，另一方面导致座椅整体上的体积增大。
发明内容
有鉴于此，本申请所要解决的技术问题在于，如何提供一种在结构紧凑的情况下保持良好的使用体验和全面的功能性的座椅。
为解决所述技术问题，提供一种用于可升降座椅的机械伸展装置，所述可升降座椅包括坐席部、靠背和脚踏，所述机械伸展装置包括：
-固定支撑在地面上的底座；
-可活动地布置在所述底座上方的联动机构，所述联动机构包括座部安装板、靠背支架和腿部组件，其中，所述腿部组件包括脚踏安装板和外翻组件；和
-布置在所述底座与所述联动机构之间的升降组件，其中，通过所述升降组件能够使所述座部安装板在坐姿位置与抬升位置之间变换。
根据本申请，通过所述联动机构能够使所述机械伸展装置至少在坐姿位置与躺姿位置之间变换，在所述躺姿位置中，所述外翻组件的最前端位于所述脚踏安装板的前方，并且所述靠背支架相对于所述座部安装板向后倾斜，其中，所述外翻组件的最前端相对于地面的高度为至少490mm。在一些实施方式中，在所述躺姿位置中，所述外翻组件的最前端相对于地面的高度为至少550mm。
在所述坐姿位置中，靠背支架连同与其附接的靠背大体上向上指向，腿部组件收拢，附接在腿部组件上的脚踏则收拢在坐席部下方；在所述躺姿位置中，靠背支架连同与其附接的靠背则与躺姿位置相比明显地向后倾斜，腿部组件向前向上伸展，附接在腿部组件上的脚踏则向前向上抬升。在从坐姿位置变换至躺姿位置的过程中，腿部组件的外翻组件展开，使得外翻组件的最前端位于脚踏安装板的前方，从而使对使用者的下肢、尤其至少对脚部和/或小腿部分的支撑部分延长，提供更好的使用体验。与此同时，由于外翻组件本身随着从坐姿位置至躺姿位置的变换过程中才展开，而在坐姿位置中仍保持收拢，因此提供了更紧凑的结构。
在一种实施方式中，所述外翻组件包括第一外翻连杆、第二外翻连杆、第三外翻连杆和外翻驱动杆，其中，通过所述脚踏安装板、所述第一外翻连杆、第二外翻连杆和第三外翻连杆构成四连杆机构，并且其中，通过所述外翻驱动杆能够驱动所述四连杆机构变形，从而使所述外翻组件的最前端位于所述脚踏安装板的前方。
在一种实施方式中，所述腿部组件还包括第一腿部连杆、第二腿部连杆、第三腿部连杆和第四腿部连杆，其中，所述第三腿部连杆和所述第四腿部连杆的前端分别与所述脚踏安装板铰接，其中，所述外翻驱动杆的前端与所述四连杆机构铰接，并且所述外翻驱动杆的后端与所述第四腿部连杆在第一铰接点处铰接。
在一种实施方式中，所述第一外翻连杆包括设置在其第一自由端部上的第二铰接点、设置在其第二自由端部上的第四铰接点和位于所述第二铰接点与所述第四铰接点之间的第三铰接点，其中，所述第一外翻连杆在所述第二铰接点处与所述外翻驱动杆铰接，在第三铰接点处与脚踏安装板铰接，并且在所述第四铰接点处与所述第三外翻连杆铰接。
在一种实施方式中，在腿部组件的展开过程中，随着所述第四腿部连杆与所述脚踏安装板之间的夹角增大，所述外翻驱动杆促使所述第一外翻连杆的第二自由端部围绕所述第三铰接点向上枢转。
在一种实施方式中，所述第一外翻连杆构造为曲拐件，其中，所述第二铰接点与第四铰接点的连线位于所述第三铰接点前方。
在一种实施方式中，所述第二外翻连杆的两端分别与所述脚踏安装板的前端和所述第三外翻连杆铰接。
在一种实施方式中，在所述躺姿位置中，所述靠背支架的前侧面与水平面的角度为最多22°。在一些实施方式中，在躺姿位置中，所述靠背支架的前侧面与水平面的角度为最多13°。
在一种实施方式中，在所述坐姿位置中，所述腿部组件相对于所述座部安装板收拢。
在一种实施方式中，在所述抬升位置中，所述座部安装板相对于所述底座抬升且向前倾斜，并且所述腿部组件相对于所述座部安装板收拢，其中，通过所述升降组件能够使所述机械伸展装置依次从躺姿位置、坐姿位置变换至抬升位置，并且能够使所述机械伸展装置反向地依次从抬升位置、坐姿位置变换至躺姿位置。
为解决所述技术问题，本申请还提供一种可升降座椅。所述可升降座椅包括机械伸展装置、与所述机械伸展装置附接的坐席部、靠背和脚踏。所述机械伸展装置包括：
-固定支撑在地面上的底座；
-可活动地布置在所述底座上方的联动机构，所述联动机构包括与坐席部附接的座部安装板、与靠背附接的靠背支架和与脚踏附接的腿部组件，其中，所述腿部组件包括脚踏安装板和外翻组件；和
-布置在所述底座与所述联动机构之间的升降组件，其中，通过所述升降组件能够使所述座部安装板在坐姿位置与抬升位置之间变换。
根据本申请，通过所述联动机构能够使所述机械伸展装置至少在坐姿位置与躺姿位置之间变换，在所述躺姿位置中，所述外翻组件的最前端位于所述脚踏安装板的前方，并且所述靠背支架相对于所述座部安装板向后倾斜，其中，所述外翻组件的最前端相对于地面的高度为至少490mm。在一些实施方式中，在所述躺姿位置中，所述外翻组件的最前端相对于地面的高度为至少550mm。
在一种实施方式中，所述外翻组件包括第一外翻连杆、第二外翻连杆、第三外翻连杆和外翻驱动杆，其中，通过所述脚踏安装板、所述第一外翻连杆、第二外翻连杆和第三外翻连杆构成四连杆机构，并且其中，通过所述外翻驱动杆能够驱动所述四连杆机构变形，从而使所述外翻组件的最前端位于所述脚踏安装板的前方。
在一种实施方式中，所述腿部组件还包括第一腿部连杆、第二腿部连杆、第三腿部连杆和第四腿部连杆，其中，所述第三腿部连杆和所述第四腿部连杆的前端分别与所述脚踏安装板铰接，其中，所述外翻驱动杆的前端与所述四连杆机构铰接，并且所述外翻驱动杆的后端与所述第四腿部连杆在第一铰接点处铰接。
在一种实施方式中，所述第一外翻连杆包括设置在其第一自由端部上的第二铰接点、设置在其第二自由端部上的第四铰接点和位于所述第二铰接点与所述第四铰接点之间的第三铰接点，其中，所述第一外翻连杆在所述第二铰接点处与所述外翻驱动杆铰接，并且在所述第四铰接点处与所述第三外翻连杆铰接。
在一种实施方式中，在腿部组件的展开过程中，随着所述第四腿部连杆与所述脚踏安装板之间的夹角增大，所述外翻驱动杆促使所述第一外翻连杆的第二自由端部围绕所述第三铰接点向上枢转。
在一种实施方式中，所述第一外翻连杆构造为曲拐件，其中，所述第二铰接点与第四铰接点的连线位于所述第三铰接点前方。
在一种实施方式中，所述第二外翻连杆的两端分别与所述脚踏安装板的前端和所述第三外翻连杆铰接。
在一种实施方式中，在所述躺姿位置中，所述靠背支架的前侧面与水平面的角度为最多22°地，在躺姿位置中，所述靠背支架的前侧面与水平面的角度为最多13°。
在一种实施方式中，在所述坐姿位置中，所述脚踏收拢在所述坐席部下方。
在一种实施方式中，在所述抬升位置中，所述座部安装板相对于所述底座抬升且向前倾斜，并且所述坐席部收拢在所述坐席部下方，其中，通过所述升降组件能够使所述机械伸展装置依次从躺姿位置、坐姿位置变换至抬升位置，并且能够使所述机械伸展装置反向地依次从抬升位置、坐姿位置变换至躺姿位置。
在此要说明的是，对于机械伸展装置所述的细节和优点也适用于包括这种机械伸展装置的可升降座椅。
此外，在此还要说明的是，本申请中所述“前后方向”或者说“纵向”是就可升降座椅或其机械伸展装置的腿部组件的伸展方向而言的，具体来说，“前方”是指朝向腿部组件的方向，“后方”是指朝向靠背组件的方向。“左右方向”或者说“横向”是就可升降座椅或其机械伸展装置的在水平方向上与“前后方向”或“纵向”垂直的方向而言的。
附图说明
以下借助附图详细阐述本申请的实施方式。
图1以立体图方式示意性示出根据本申请的一种实施方式的用于可升降座椅的机械伸展装置，其处于躺姿位置；
图2以立体图方式示意性示出图1所示机械伸展装置，其处于坐姿位置；
图3以侧视图方式示意性示出图1所示机械伸展装置的抬升位置；
图4以侧视图方式示意性示出图1所示机械伸展装置的坐姿位置；
图5以侧视图方式示意性示出图1所示机械伸展装置的TV姿位置；
图6以侧视图方式示意性示出图1所示机械伸展装置的躺姿位置；
图7示意性示出图1所示机械伸展装置的腿部组件的局部放大图；
图8示意性示出图7所示腿部组件的另一角度的局部放大图。
具体实施方式
下面将结合本申请实施方式中的附图，对本申请实施方式中的技术方案进行清楚、完整地描述，显然，所描述的实施方式仅仅是本申请一部分实施方式，而不是全部的实施方式。基于本申请中的实施方式，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施方式，都属于本申请保护的范围。
此处所称的“一个实施方式”或“实施方式”是指可包含于本申请至少一个实现方式中的特定特征、结构或特性。在本申请的描述中，需要理解的是，术语“上”、“下”、“左”、“右”、“顶”、“底”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含的包括一个或者更多个该特征。而且，术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本申请的实施方式能够以除了在这里图示或描述的那些以外的顺序实施。
图1以立体图方式示意性示出根据本申请的一种实施方式的可升降座椅的机械伸展装置1，此外，该可升降座椅还包括与该机械伸展装置1附接的未图示的坐席部、靠背和脚踏。图1所示的机械伸展装置1处于躺姿位置，图2所示的机械伸展装置1处于坐姿位置。
该机械伸展装置1包括底座10、联动机构11、升降组件12和电驱动单元13。
底座10固定地支撑在地面上。通过联动机构11和升降组件12能够使可升降座椅至少依次从图1和图6所示的躺姿位置变换至图2和图4所示的坐姿位置、图3所示的抬升位置，并且能够至少依次从抬升位置、坐姿位置变换至躺姿位置。其中，可升降座椅还可以如图5所示变换至介于躺姿位置与坐姿位置之间的TV姿位置。
在图1和图2所示实施例中，该底座10包括沿可升降座椅的横向延伸的后底座横梁101、前底座横梁102和沿纵向延伸且相互间隔地布置在左右两侧的两个底座纵梁103。前底座横梁101、后底座横梁102和底座纵梁103构成矩形的底座10。
在该底座10上方可活动地布置有联动机构11。该联动机构11构造为多连杆机构，并且包括承载框架110、座部组件111、靠背组件112和腿部组件113。
该承载框架110大体上构造为矩形框架，并且包括沿可活动座椅的纵向延伸且在左右两侧相互间隔地布置的两个承载纵梁1100和在两个承载纵梁1100之间延伸且将承载纵梁1100相连的前承载横梁1106和后承载横梁1107。在承载框架110靠近腿部组件113的前端，尤其如图2所示实施例中，在前承载横梁1106上包括前端延长部1101。在承载纵梁1100的靠近靠背组件112的后端包括后端延长部1102。
在此要说明的是，前端延长部1101既可以是前承载横梁1106的一部分，也可以是与前承载横梁1106固定连接的部件。后端延长部1102既可以是承载纵梁1100的一部分，也可以是与承载纵梁1100固定连接的部件。
该座部组件111包括L形构造的座部安装件1110、构造在座部安装件1110前端上的前端安装件1111、座部前摆杆1112、座部后摆杆1113、驱动连杆1114和横向延伸的马达驱动杆1115。
座部安装件1110用于附接坐席部。前端安装件1111固定连接在座部安装件1110上，或者构造为从座部安装件1110的前端向上突伸的凸起部。驱动连杆1114的一端与前端安装件11枢转连接，另一端与从马达驱动杆1115的两端突伸的驱动杆凸起1115a枢转连接。座部前摆杆1112构造为曲拐件，其在一个自由端部上与座部安装件1110的前端枢转连接，在另一个自由端部上至少间接地通过腿部驱动杆1116与腿部组件113枢转连接。座部后摆杆1113的一端与座部安装件1110的后端枢转连接，另一端至少间接地与承载框架110、尤其是承载纵梁1100枢转连接。
如图4所示，座部组件111通过传动机构与承载框架110可活动地连接。传动机构包括第一传动杆1103、第二传动杆1104和第三传动杆1105，其中，座部前摆杆1112的中部与第一传动杆1103的前端枢转连接，第一传动杆1103的后端与第二传动杆1104的前端枢转连接，第一传动杆1103的中部与承载纵梁1100、尤其是承载纵梁的后端延长部1102枢转连接；第二传动杆1104的后端与第三传动杆1105的下端枢转连接，第三传动杆1105的上端与座部后摆杆1113的下端枢转连接，第三传动杆1105的中部则与承载纵梁1100、尤其是承载纵梁的后端延长部1102枢转连接。
该靠背组件112包括靠背支架1120和靠背连杆1121。该靠背支架1120用于附接靠背，并且靠背支架1120的前端与座部安装件1110的上端枢转连接，靠背支架1120的后端与靠背连杆1121的上端枢转连接，靠背连杆1121的下端与承载纵梁1100、尤其是承载纵梁的后端延长部1102枢转连接。
该腿部组件113构造为多连杆机构，并且包括第一腿部连杆1131、第二腿部连杆1132、第三腿部连杆1133、第四腿部连杆1134、用于附接脚踏的脚踏安装板1135和与脚踏安装板1135枢转连接的外翻组件。
如图5和图6所示，第一腿部连杆1131的后端与座部前摆杆1112的中部枢转连接，第一腿部连杆1131的前端与第四腿部连杆1134的后端枢转连接；第二腿部连杆1132的后端与座部安装件1110的前端枢转连接，第二腿部连杆1132的前端与第三腿部连杆1133的后端枢转连接；第三腿部连杆1133和第四腿部连杆1134的前端均与脚踏安装板1135枢转连接。第二腿部连杆1132的中部还与第四腿部连杆1134的中部相互铰接。
如图7和图8所示，外翻组件枢转连接在脚踏安装板1135的前部，为此，在脚踏安装板1135的前部一体式构造有脚踏板前端延长部1135a。所述外翻组件包括第一外翻连杆1136、第二外翻连杆1137、第三外翻连杆1138和外翻驱动杆1139，其中，通过脚踏安装板1135、所述第一外翻连杆1136、第二外翻连杆1137和第三外翻连杆1138构成四连杆机构。
该第一外翻连杆1136构造为曲拐件，其中，第一外翻连杆1136包括在其第一自由端部上的第二铰接点P2、在其第二自由端部上的第四铰接点P4和位于第二铰接点P2与第四铰接点P4之间的第三铰接点P3。第二铰接点P2与第四铰接点P4的连线位于第三铰接点P3前方。
外翻驱动杆1139包括大体上沿前后方向相互对置的前端和后端。外翻驱动杆1139利用其后端在第一铰接点P1处与腿部组件113的第四腿部连杆1134枢转连接，利用其前端在第二铰接点P2处与第一外翻连杆1136铰接。第一外翻连杆1136在第三铰接点P3处与脚踏板前端延长部1135a铰接，在第四铰接点P4处与第三外翻连杆1138铰接。第二外翻连杆1137的一端与脚踏板前端延长部1135a铰接，另一端与第三外翻连杆1138铰接，其中，第二外翻连杆1137与脚踏板前端延长部1135a较之第三铰接点P3更靠前。
在腿部组件113的展开过程中，随着第四腿部连杆1134与脚踏安装板1135之间的夹角增大，外翻驱动杆1139促使第一外翻连杆1136的第二自由端部围绕第三铰接点P3向上枢转，从而通过外翻驱动杆1139促使由脚踏安装板1135、所述第一外翻连杆1136、第二外翻连杆1137和第三外翻连杆1138构成的四连杆机构变形，使外翻组件的最前端位于脚踏安装板1135的前方。
升降机构12包括升降基座120、第一升降连杆121和第二升降连杆122。升降基座120固定安装在底座10的底座纵梁101上。第一升降连杆121和第二升降连杆122分别以其一端铰接在升降基座120上，并分别以其另一端铰接在承载框架110上，具体而言铰接在与前承载横梁1106固定连接的前端延长部1101上。由此，通过升降基座120、第一升降连杆121、第二升降连杆122和前端延长部1101构成四连杆机构，从而能够通过该四连杆机构的变型，实现承载框架110相对于底座10的抬升和下降，进而带动与承载框架110连接的座部组件111、靠背组件112和腿部组件113相对于底座10抬升和下降。第二升降连杆122在其面向底座10的侧面上构造有升降止挡板1220。当升降机构12未抬升时，升降止挡板1220以其下表面抵靠在底座纵梁103的上表面上。
为促使可升降座椅在不同姿态之间变换，还提供了电驱动单元13。在该实施方式中，电驱动单元13包括仅一个电动机。电动机可以构造为推杆电机，其包括连接在后底座横梁101上的电机头和相对于电机头可伸缩活动的电机推杆，该电机推杆与马达驱动杆1115连接。
通过该电驱动单元13可以促使可升降座椅依次从躺姿位置变换至坐姿位置、抬升位置，或者反向地从抬升位置变换至坐姿位置、躺姿位置。
当然，在未示出的实施例中，电驱动单元13也可以包括两个电动机，其中一个电动机促使可升降座椅在坐姿位置与躺姿位置之间变换，另一个电动机促使可升降座椅在抬升位置与坐姿位置和/或躺姿位置之间变换。
当希望可升降座椅从图3所示的抬升位置变换至图6所示的躺姿位置时，电机推杆开始相对于电机头回收。由此，抬升机构12回收，促使承载框架110、乃至整个联动机构11相对于底座10下降。当升降止挡板1220抵靠在底座纵梁103上时，抬升机构12停止回收，联动机构11不再下降，可升降座椅实现图4所示的坐姿位置。
此时，电机推杆继续相对于电机头回收。由此，带动马达驱动杆1115翻转，进而带动驱动连杆1114枢转，并促使前端安装件1111推动座部安装件1110向后倾斜。与此同时，靠背组件112向后倾斜，并且在传动机构的作用下，座部前摆杆1112枢转，腿部驱动杆1116前移，进而推动腿部组件113展开。从而达到图5所示的TV姿位置乃至图6所示的躺姿位置。
如前所述，在腿部组件113的展开过程中，随着第四腿部连杆1134与脚踏安装板1135之间的夹角增大，外翻驱动杆1139促使第一外翻连杆1136的第二自由端部围绕第三铰接点P3向上枢转，使外翻组件的最前端位于脚踏安装板1135的前方。
在躺姿位置中，外翻组件的最前端相对于地面的高度H为至少490mm，在一些实施方式中为550mm；靠背支架1120的前侧面与水平面的角度α为最多22°，在一些实施方式中为最多13°。
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Claims (24)

  1. 一种用于可升降座椅的机械伸展装置，所述可升降座椅包括坐席部、靠背和脚踏，所述机械伸展装置包括：
    -固定支撑在地面上的底座；
    -可活动地布置在所述底座上方的联动机构，所述联动机构包括座部安装板、靠背支架和腿部组件，其中，所述腿部组件包括脚踏安装板和外翻组件；和
    -布置在所述底座与所述联动机构之间的升降组件，其中，通过所述升降组件能够使所述座部安装板在坐姿位置与抬升位置之间变换，
    其中，通过所述联动机构能够使所述机械伸展装置至少在坐姿位置与躺姿位置之间变换，在所述躺姿位置中，所述外翻组件的最前端位于所述脚踏安装板的前方，并且所述靠背支架相对于所述座部安装板向后倾斜，其中，所述外翻组件的最前端相对于地面的高度为至少490mm。
  2. 根据权利要求1所述的机械伸展装置，其中，在所述躺姿位置中，所述外翻组件的最前端相对于地面的高度为至少550mm。
  3. 根据权利要求1所述的机械伸展装置，其中，所述外翻组件包括第一外翻连杆、第二外翻连杆、第三外翻连杆和外翻驱动杆，其中，通过所述脚踏安装板、所述第一外翻连杆、第二外翻连杆和第三外翻连杆构成四连杆机构，并且其中，通过所述外翻驱动杆能够驱动所述四连杆机构变形，从而使所述外翻组件的最前端位于所述脚踏安装板的前方。
  4. 根据权利要求3所述的机械伸展装置，其中，所述腿部组件还包括第一腿部连杆、第二腿部连杆、第三腿部连杆和第四腿部连杆，其中，所述第三腿部连杆和所述第四腿部连杆的前端分别与所述脚踏安装板铰接，其中，所述外翻驱动杆的前端与所述四连杆机构铰接，并且所述外翻驱动杆的后端与所述第四腿部连杆在第一铰接点处铰接。
  5. 根据权利要求4所述的机械伸展装置，其中，所述第一外翻连杆包括设置在其第一自由端部上的第二铰接点、设置在其第二自由端部上的第四铰接点和位于所述第二铰接点与所述第四铰接点之间的第三铰接点，其中，所述第一外翻连杆在所述第二铰接点处与所述外翻驱动杆铰接，在第三铰接点处与脚踏安装板铰接，并且在所述第四铰接点处与所述第三外翻连杆铰接。
  6. 根据权利要求5所述的机械伸展装置，其中，在腿部组件的展开过程中，随着所述第四腿部连杆与所述脚踏安装板之间的夹角增大，所述外翻驱动杆促使所述第一外翻连杆的第二自由端部围绕所述第三铰接点向上枢转。
  7. 根据权利要求5所述的机械伸展装置，其中，所述第一外翻连杆构造为曲拐件，其中，所述第二铰接点与第四铰接点的连线位于所述第三铰接点前方。
  8. 根据权利要求5所述的机械伸展装置，其中，所述第二外翻连杆的两端分别与所述脚踏安装板的前端和所述第三外翻连杆铰接。
  9. 根据权利要求1所述的机械伸展装置，其中，在所述躺姿位置中，所述靠背支架的前侧面与水平面的角度为最多22°。
  10. 根据权利要求9所述的机械伸展装置，其中，在躺姿位置中，所述靠背支架的前侧面与水平面的角度为最多13°。
  11. 根据权利要求1所述的机械伸展装置，其中，在所述坐姿位置中，所述腿部组件相对于所述座部安装板收拢。
  12. 根据权利要求11所述的机械伸展装置，其中，在所述抬升位置中，所述座部安装板相对于所述底座抬升且向前倾斜，并且所述腿部组件相对于所述座部安装板收拢，其中，通过所述升降组件能够使所述机械伸展装置依次从躺姿位置、坐姿位置变换至抬升位置，并且能够使所述机械伸展装置反向地依次从抬升位置、坐姿位置变换至躺姿位置。
  13. 一种可升降座椅，所述可升降座椅包括机械伸展装置、与所述机械伸展装置附接的坐席部、靠背和脚踏，其中，所述机械伸展装置包括：
    -固定支撑在地面上的底座；
    -可活动地布置在所述底座上方的联动机构，所述联动机构包括与坐席部附接的座部安装板、与靠背附接的靠背支架和与脚踏附接的腿部组件，其中，所述腿部组件包括脚踏安装板和外翻组件；和
    -布置在所述底座与所述联动机构之间的升降组件，其中，通过所述升降组件能够使所述座部安装板在坐姿位置与抬升位置之间变换，
    其中，通过所述联动机构能够使所述机械伸展装置至少在坐姿位置与躺姿位置之间变换，在所述躺姿位置中，所述外翻组件的最前端位于所述脚踏安装板的前方，并且所述靠背支架相对于所述座部安装板向后倾斜，其中，所述外翻组件的最前端相对于地面的高度为至少490mm。
  14. 根据权利要求13所述的可升降座椅，其中，在所述躺姿位置中，所述外翻组件的最前端相对于地面的高度为至少550mm。
  15. 根据权利要求13所述的可升降座椅，其中，所述外翻组件包括第一外翻连杆、第二外翻连杆、第三外翻连杆和外翻驱动杆，其中，通过所述脚踏安装板、所述第一外翻连杆、第二外翻连杆和第三外翻连杆构成四连杆机构，并且其中，通过所述外翻驱动杆能够驱动所述四连杆机构变形，从而使所述外翻组件的最前端位于所述脚踏安装板的前方。
  16. 根据权利要求15所述的可升降座椅，其中，所述腿部组件还包括第一腿部连杆、第二腿部连杆、第三腿部连杆和第四腿部连杆，其中，所述第三腿部连杆和所述第四腿部连杆的前端分别与所述脚踏安装板铰接，其中，所述外翻驱动杆的前端与所述四连杆机构铰接，并且所述外翻驱动杆的后端与所述第四腿部连杆在第一铰接点处铰接。
  17. 根据权利要求16所述的可升降座椅，其中，所述第一外翻连杆包括设置在其第一自由端部上的第二铰接点、设置在其第二自由端部上的第四铰接点和位于所述第二铰接点与所述第四铰接点之间的第三铰接点，其中，所述第一外翻连杆在所述第二铰接点处与所述外翻驱动杆铰接，并且在所述第四铰接点处与所述第三外翻连杆铰接。
  18. 根据权利要求17所述的可升降座椅，其中，在腿部组件的展开过程中，随着所述第四腿部连杆与所述脚踏安装板之间的夹角增大，所述外翻驱动杆促使所述第一外翻连杆的第二自由端部围绕所述第三铰接点向上枢转。
  19. 根据权利要求17所述的可升降座椅，其中，所述第一外翻连杆构造为曲拐件，其中，所述第二铰接点与第四铰接点的连线位于所述第三铰接点前方。
  20. 根据权利要求17所述的可升降座椅，其中，所述第二外翻连杆的两端分别与所述脚踏安装板的前端和所述第三外翻连杆铰接。
  21. 根据权利要求13所述的可升降座椅，其中，在所述躺姿位置中，所述靠背支架的前侧面与水平面的角度为最多22°。
  22. 根据权利要求21所述的可升降座椅，其中，在躺姿位置中，所述靠背支架的前侧面与水平面的角度为最多13°。
  23. 根据权利要求13所述的可升降座椅，其中，在所述坐姿位置中，所述脚踏收拢在所述坐席部下方。
  24. 根据权利要求23所述的可升降座椅，其中，在所述抬升位置中，所述座部安装板相对于所述底座抬升且向前倾斜，并且所述坐席部收拢在所述坐席部下方，其中，通过所述升降组件能够使所述机械伸展装置依次从躺姿位置、坐姿位置变换至抬升位置，并且能够使所述机械伸展装置反向地依次从抬升位置、坐姿位置变换至躺姿位置。
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