US20250151908A1 - Mechanical stretching device for movable seat unit and seat unit - Google Patents

Mechanical stretching device for movable seat unit and seat unit Download PDF

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Publication number
US20250151908A1
US20250151908A1 US19/026,632 US202519026632A US2025151908A1 US 20250151908 A1 US20250151908 A1 US 20250151908A1 US 202519026632 A US202519026632 A US 202519026632A US 2025151908 A1 US2025151908 A1 US 2025151908A1
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US
United States
Prior art keywords
backrest
link
stretching device
footrest
assembly
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
US19/026,632
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English (en)
Inventor
Xiaochun Lei
Xiaohong Li
Yuankun Li
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
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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 CN202322904449.8U external-priority patent/CN221012563U/zh
Priority claimed from CN202322921168.3U external-priority patent/CN221129340U/zh
Priority claimed from PCT/CN2024/127047 external-priority patent/WO2025087331A1/zh
Application filed by Remacro Technology Co Ltd filed Critical Remacro Technology Co Ltd
Assigned to Remacro Technology Co., Ltd. reassignment Remacro Technology Co., Ltd. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEI, Xiaochun, LI, XIAOHONG, Li, Yuankun
Publication of US20250151908A1 publication Critical patent/US20250151908A1/en
Pending legal-status Critical Current

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    • 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
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/024—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable inclination
    • A47C1/0242—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable inclination by electric motors
    • 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
    • A47C1/034—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts including a leg-rest or foot-rest
    • A47C1/0342—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts including a leg-rest or foot-rest in combination with movable backrest-seat unit or back-rest
    • A47C1/0345—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts including a leg-rest or foot-rest in combination with movable backrest-seat unit or back-rest characterised by foot-rests actuated by lazy-tongs
    • 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
    • A47C1/034—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts including a leg-rest or foot-rest
    • A47C1/035—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts including a leg-rest or foot-rest in combination with movably-coupled seat and back-rest
    • A47C1/0355—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts including a leg-rest or foot-rest in combination with movably-coupled seat and back-rest actuated by linkages, e.g. lazy-tongs mechanisms
    • 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
    • A47C7/14—Seat parts of adjustable shape; elastically mounted ; adaptable to a user contour or ergonomic seating positions
    • 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 disclosure relates to a mechanical stretching device for a movable seat unit, and a seat unit including the mechanical stretching device.
  • the movable chair unit generally includes a mechanical stretching device, whereby it can be switched between a sitting position, a TV position (or relaxing position) and a lying position.
  • a mechanical stretching device When the chair unit is switched from the sitting position to the relaxing position, the footrest of the chair unit extends forward, and the angle between the backrest and the seat cushion remains basically unchanged.
  • the chair unit When the chair unit is switched from the relaxing position to the lying position, the footrest extends further forward and upward than in the relaxing position, and the backrest reclines significantly.
  • the legs are higher than the head, experiencing the so-called “zero gravity” feeling.
  • the disadvantage in the known design is that as the seat unit is switched to the lying position, a gap occurs between the backrest and the seat, which, on the one hand, pulls the user's jacket upward, and on the other hand, causes the risk of the item falling out of the gap.
  • the technical problem to be solved by the present disclosure is to provide a seat unit with a simple structure and improved ergonomics.
  • a mechanical stretching device for a movable seat unit including:
  • the mechanical stretching device allows the seat unit to be switched between a sitting position, a TV position, and/or a lying position; the first footrest member is folded below the seat when in the sitting position; the first footrest member is stretched forward when in the TV position; and the backrest is relined backward, a highest point of the footrest is higher than a highest point of the backrest, and the first footrest member is stretched forward and upward, when in the lying position.
  • the backrest is reclined at least 35° more in the lying position than in the sitting position. In some implementations, it is reclined backwards at least 40°. This provides users with a more comfortable zero-gravity experience.
  • a front end of the first footrest member is raised in the lying position, so that an acute angle with an opening facing forward in a range of 10° to 23° is formed between the footrest surface of the first footrest member and the horizontal plane. In some implementations, the acute angle with the opening facing forward in a range of 16° to 19° is formed between the footrest surface of the first footrest member and the horizontal plane.
  • the acute angle of “the opening facing forward” as described herein refers to the direction of the opening of the acute angle faces the leg stretching device.
  • the leg stretching device further includes a second footrest member; both the first footrest member and the second footrest member are folded below the seat when in the sitting position; both the first footrest member and the second footrest member are stretched forward when in the TV position; and the backrest is relined backward, a highest point of the footrest is higher than a highest point of the backrest, and the first footrest member is stretched forward and upward, when in the lying position, in which the second footrest member is located in front of the first footrest member.
  • a front end of the second footrest member is raised in the lying position, so that an acute angle with an opening facing forward in a range of 10° to 23° is formed between the footrest surface of the second footrest member and the horizontal plane.
  • the acute angle with the opening facing forward in a range of 12° to 15° is formed between the footrest surface of the second footrest member and the horizontal plane.
  • the front end of the second footrest member is lowered in the lying position, so that the acute angle with the opening facing backward in a range of 8° to 30° is formed between the footrest surface of the second footrest member and the horizontal plane.
  • the angle between the second footrest member 37 and the horizontal plane is in a range of 12° to 20°.
  • the acute angle “the opening facing backward” as described herein refers to the direction of the opening of the acute angle faces the backrest assembly.
  • the first footrest member is connected to the second footrest member through a footrest extension assembly
  • the footrest extension assembly includes a first extension member and a second extension member hinged to each other.
  • an end of the first extension member is hinged to the second footrest member distal thereto, an opposite end of the first extension member is hinged to an end of the second extension member, an opposite end of the second extension member is hinged to the leg link connecting the first footrest member proximal thereto, and the front end of the second footrest is raised or lowered in the lying position by adjusting the hinge position of the first extension member with the second footrest member, so that a comfortable angle for the user is formed by the corresponding footrest surface with the horizontal surface.
  • the backrest connecting member is coupled to the seat assembly through the backrest link assembly, and the backrest link assembly itself is compressed while the backrest connecting member is compressed through the scissor structure of the backrest link assembly.
  • the backrest link assembly further includes a third backrest link, a fourth backrest link, and a fifth backrest link; a lower end of the third backrest link is hinged to the second backrest link, an upper end of the third backrest link is hinged to a rear end of the backrest connecting member, an upper end of the fourth backrest link is hinged to a front end of the backrest connecting member at a first hinge point, a front end of the fifth backrest link is hinged to the first backrest link at a second hinge point, a rear end of the fifth backrest link is hinged to a middle of the third backrest link, and a lower end of the fourth backrest link is hinged to a middle of the fifth backrest link.
  • the backrest connecting member when the seat unit is switched from the sitting position to the lying position, the backrest connecting member is reclined backwards by means of compression of the backrest link assembly.
  • a relative movement between the lateral plate and the central driven member leads to an increase in a distance from a hinge point between the first backrest link and the central driven member to a hinge point between the second backrest link and the lateral plate, so as to achieve compression of the backrest link assembly.
  • both the first hinge point and the second hinge point are moved forward, and a distance between the first hinge point and the second hinge point is decreased.
  • the seat assembly further includes a front swing rod, a rear swing rod, a seat driven member, and a lateral plate driven member; lower ends of both the front swing rod and the rear swing rod are pivotally connected to the base assembly, upper ends of both the front swing rod and the rear swing rod are connected to the lateral plate through the central driven member, the seat driven member, and the lateral plate driven member.
  • a movement of the backrest assembly and the leg stretching device relative to the seat assembly is caused by rotation of the lateral plate relative to the base assembly, so as to achieve a switching of the seat unit between the sitting position and the lying position.
  • the mechanical stretching device further includes an electric driving device coupled between the base assembly and the lateral plate.
  • the mechanical stretching device further includes an electric driving device, in which the electric driving device includes a first electric driver and a second electric driver, the first electric driver is configured to cause the leg stretching device to stretch and retract relative to the seat assembly, and the second electric driver is configured to cause the backrest assembly to move relative to the seat assembly.
  • the electric driving device includes a first electric driver and a second electric driver
  • the first electric driver is configured to cause the leg stretching device to stretch and retract relative to the seat assembly
  • the second electric driver is configured to cause the backrest assembly to move relative to the seat assembly.
  • the first electric driver and the second electric driver operate independently of each other, thereby enabling the backrest assembly and the leg stretching device to be flexibly adjusted independently of each other.
  • the mechanical stretching device can be switched between multiple positions, for example, switched between a sitting position, a TV position, and/or a lying position.
  • the footrest is folded below the seat when in the sitting position; the footrest is stretched forward when in the TV position; and the backrest is relined backward, and a highest point of the footrest is higher than a highest point of the backrest, when in the lying position.
  • the mechanical stretching device does not only show the three positions of sitting position, TV position, and lying position, but also can show the intermediate position between the three positions through the different positions of the backrest and the leg stretching device, for example, the backrest is inclined backward with respect to the seat assembly only by the second electric driver, and the first electric driver does not work, so that the footrest is still folded under the seat.
  • the leg stretching device further includes a second footrest member; when the first electric driver causes the leg stretching device to stretch to the front of the seat assembly, the second footrest member is located in front of the first footrest member.
  • the backrest connecting member is coupled to the seat assembly through the backrest link assembly, and the backrest link assembly itself is compressed while the backrest connecting member is compressed through the scissor structure of the backrest link assembly.
  • the first electric driver acts between the seat assembly and the leg stretching device
  • the second electric driver acts between the base assembly and the seat assembly
  • the base assembly includes the base rear crossbeam
  • the leg stretching device includes a first motor crossbar
  • the seat assembly includes a second motor crossbar close to the leg stretching device and a third motor crossbar close to the backrest assembly.
  • the first electric driver acts between the first motor crossbar and the second motor crossbar
  • the second electric driver acts between the third motor crossbar and the base rear crossbeam.
  • the second motor crossbar is connected to the lateral plate, and the third motor crossbar is connected to the central driven member. In some implementations, the second motor crossbar is fixedly connected to the lateral plate, and the third motor crossbar is fixedly connected to the central driven member.
  • an end of the first electric driver is coupled to the first motor crossbar, and an opposite end thereof is coupled to the lateral plate motor crossbar.
  • An end of the second electric driver is coupled to the base rear crossbeam, and an opposite end thereof is also coupled to the lateral plate motor crossbar.
  • the backrest link assembly further includes a third backrest link, a fourth backrest link, and a fifth backrest link; a lower end of the third backrest link is hinged to the second backrest link, an upper end of the third backrest link is hinged to a rear end of the backrest connecting member, an upper end of the fourth backrest link is hinged to a front end of the backrest connecting member at a first hinge point, a front end of the fifth backrest link is hinged to the first backrest link at a second hinge point, a rear end of the fifth backrest link is hinged to a middle of the third backrest link, and a lower end of the fourth backrest link is hinged to a middle of the fifth backrest link.
  • the backrest connecting member when the backrest assembly is moved relative to the seat assembly through the second electric driver, the backrest connecting member is reclined backwards through compression of the backrest link assembly.
  • a relative movement between the lateral plate and the central driven member leads to an increase in a distance from a hinge point between the first backrest link and the central driven member to a hinge point between the second backrest link and the lateral plate, so as to achieve the compression of the backrest link assembly.
  • both the first hinge point and the second hinge point are moved forward, and a distance between the first hinge point and the second hinge point is decreased.
  • the seat assembly further includes a front swing rod, a rear swing rod, a seat driven member, a lateral plate driven member, and a driving link; lower ends of both the front swing rod and the rear swing rod are pivotally connected to the base assembly, upper ends of both the front swing rod and the rear swing rod are connected to the lateral plate through the central driven member, the seat driven member, and the lateral plate driven member, an upper end of the driving link is hinged to a middle of the seat driven member, and a lower end of the driving link is hinged to a middle of the base assembly.
  • a movement of the backrest assembly relative to the seat assembly is caused by rotation of the lateral plate relative to the base assembly.
  • both the first electric driver and the second electric driver are designed as linear electric drivers.
  • a seat unit including: a seat, a backrest, a footrest, and a aforementioned mechanical stretching device, in which the lateral plate is attached to the seat, the backrest connecting member is attached to the backrest, and the first footrest member is attached to the footrest.
  • FIG. 1 is a perspective view of a mechanical stretching device according to a first embodiment of the present disclosure in the sitting position;
  • FIG. 2 is a perspective view of the mechanical stretching device shown in FIG. 1 in the TV position;
  • FIG. 3 is a perspective view of the mechanical stretching device shown in FIG. 1 in the lying position;
  • FIG. 4 is a side view of the mechanical stretching device shown in FIG. 1 ;
  • FIG. 5 is a side view of the mechanical stretching device shown in FIG. 1 in the TV position;
  • FIG. 6 is a side view of the mechanical stretching device shown in FIG. 1 in the lying position
  • FIG. 7 is a perspective view of the mechanical stretching device according to a second alternative embodiment of the present disclosure in the sitting position
  • FIG. 8 is a perspective view of the mechanical stretching device shown in FIG. 7 in the TV position
  • FIG. 9 is a perspective view of the mechanical stretching device shown in FIG. 7 in the lying position
  • FIG. 10 is a side view of the mechanical stretching device shown in FIG. 7 ;
  • FIG. 11 is a side view of another view of the mechanical stretching device shown in FIG. 10 ;
  • FIG. 12 is the mechanical stretching device of a first improvement solution of the alternative embodiment shown in FIG. 7 in the TV position;
  • FIG. 13 is a side view of the mechanical stretching device shown in FIG. 12 in the lying position;
  • FIG. 14 is the mechanical stretching device of a second improvement solution of the alternative embodiment shown in FIG. 7 in the TV position;
  • FIG. 15 is a side view of the mechanical stretching device shown in FIG. 14 in the lying position;
  • FIG. 16 is a perspective view of the mechanical extension device according to a third alternative embodiment of the present application in a sitting position
  • FIG. 17 is a perspective view of the mechanical stretching device shown in FIG. 16 in the TV position;
  • FIG. 18 is a perspective view of the mechanical stretching device shown in FIG. 16 in the lying position
  • FIG. 19 is a side view of the mechanical stretching device shown in FIG. 16 ;
  • FIG. 20 is a side view of the mechanical stretching device shown in FIG. 19 in the TV position;
  • FIG. 21 is a side view of the mechanical stretching device shown in FIG. 19 in the lying position;
  • FIG. 22 is a perspective view of the mechanical stretching device according to a fourth alternative embodiment of the present disclosure in the sitting position
  • FIG. 23 is a perspective view of the mechanical stretching device shown in FIG. 22 in the TV position;
  • FIG. 24 is a perspective view of the mechanical stretching device shown in FIG. 22 in the lying position
  • FIG. 25 is a side view of the mechanical stretching device shown in FIG. 22 ;
  • FIG. 26 is a side view of of the mechanical stretching device shown in FIG. 25 in another perspective;
  • FIG. 27 is a side view of the mechanical stretching device shown in FIG. 26 in the TV position;
  • FIG. 28 is a side view of the mechanical stretching device shown in FIG. 26 in the lying position.
  • FIGS. 1 to 6 a first embodiment of a mechanical stretching device for a movable seat unit is schematically shown in accordance with FIGS. 1 to 6 .
  • the mechanical stretching device includes a seat assembly 1 , a backrest assembly 2 , and a leg stretching device 3 .
  • the backrest assembly 2 is hinged to a rear part of the seat assembly 1 and the leg stretching device 3 is hinged to a front part of the seat assembly 1 .
  • the seat assembly 1 is attached to a seat of the seat unit, the backrest assembly 2 is attached to a backrest of the seat unit, and the leg stretching device 3 is attached to a footrest of the seat unit.
  • the seat unit, or mechanical stretching device thereof can be switched between a sitting position, a TV position, and/or a lying position by means of the relative movement of the seat assembly 1 , the backrest assembly 2 , and the leg stretching device 3 .
  • the backrest In the sitting position, the backrest is upright, and the footrest is folded under the seat; in the TV position, the backrest does not incline significantly backward, and the footrest is moved upward and forward to the front of the seat with the stretching of the leg stretching device; and in the lying position, the footrest remains extended to the front of the seat, and the backrest is reclined significantly backward.
  • the mechanical stretching device is configured to be applied to an iron frame floor-standing seat unit
  • the base assembly 11 supports the mechanical stretching device directly on the bottom surface, and includes two mirror-symmetrical base longitudinal beams 111 disposed on the left and right sides, and a base front crossbeam 112 and a base rear crossbeam 113 connecting the two base longitudinal beams 111 .
  • the base assembly 11 may also indirectly support the mechanical stretching device above the bottom surface, e.g., the base assembly 11 is rotatably mounted on the rotating base, or the base assembly 11 is fixedly coupled in position to the armrests of the seat unit with floor-standing armrests.
  • a lower end of the front swing rod 12 is hinged to a front end of the base longitudinal beam 111
  • a lower end of the rear swing rod 13 is hinged to a rear end of the base longitudinal beam 111
  • the lateral plate 140 is movable relative to the base assembly 11
  • the seat assembly 1 further includes a central driven member 15 , a seat driven member 16 , and a lateral plate driven member 17 .
  • the central driven member 15 is provided with a plurality of hinge points, and the central driven member 15 is respectively hinged with the backrest assembly 2 , the lateral plate 140 , the seat driven member 16 , and the rear swing rod 13 at different hinge points.
  • An end of the seat driven member 16 is connected to the front swing rod 12 through the lateral plate driven member 17 , and an opposite end of the seat driven member 16 is connected to the central driven member 15 . Accordingly, the movement of the lateral plate 140 relative to the base assembly 11 can be driven by the rotation of the front swing rod 12 and the rear swing rod 13 , which in turn drives the movement of the backrest assembly 2 .
  • the backrest assembly 2 includes a backrest connecting member 20 attached to the backrest and a backrest link assembly pivotally connected to the backrest connecting member 20 .
  • the backrest link assembly includes a first backrest link 21 , a second backrest link 22 , a third backrest link 23 , a fourth backrest link 24 , and a fifth backrest link 25 .
  • An end of the first backrest link 21 is hinged to the central driven member 15
  • an end of the second backrest link 22 is hinged to a rear end of the lateral plate 140
  • the first backrest link 21 is hinged to the second backrest link 22 .
  • An opposite end of the second backrest link 22 is hinged to a lower end of the third backrest link 23
  • an upper end of the third backrest link 23 is hinged to a rear end of the backrest connecting member 20
  • An upper end of the fourth backrest link 24 is hinged to a front end of the backrest connecting member 20 at a first hinge point P 1
  • a front end of the fifth backrest link 25 is hinged to an opposite end of the first backrest link 21 at a second hinge point P 2
  • a rear end of the fifth backrest link 25 is hinged to a middle of the third backrest link 23
  • a lower end of the fourth backrest link 24 is hinged to a middle of the fifth backrest link 25 .
  • the mechanical stretching device further includes a first transmission member 18 and a second transmission member 19 pivotally connected with each other, an end of the first transmission member 18 is hinged to an end of the second transmission member 19 , an opposite end of the first transmission member 18 is hinged to the lateral plate 140 , and an opposite end of the second transmission member 19 is hinged to the leg stretching device 3 , in particular to the first leg link 31 .
  • the lateral plate 140 of the seat assembly 1 moves relative to the base assembly 11
  • the lateral plate 140 drives the retracting and stretching movement of the leg stretching device 3 .
  • an electric driving device 4 is also provided.
  • the lateral plate 140 includes a motor crossbar 40 fixedly connected in inner side of the lateral plate 140 , and the electric driving device 4 is coupled between the motor crossbar 40 and the base front crossbeam 112 of the base assembly 11 .
  • the electric driving device 4 is designed as a linear electric driver, and the lateral plate 140 can be moved relative to the base assembly 11 through the retracting and stretching movement of the linear electric driver, which drives the movement of the backrest assembly 2 and the leg stretching device 3 , thereby realizing the switching of the seat unit between different positions, such as between the sitting position, the TV position and the lying position.
  • the electric driving device 4 is designed in this embodiment for causing the mechanical stretching device of the seat unit to be switched between the sitting position, the TV position and the lying position.
  • the electric driving device 4 includes a motor head 41 , a motor sliding rail 42 fixedly connected to the motor head 41 , a motor slider 43 and a motor link 44 that can slide relative to the motor head 41 along the motor sliding rail 42 .
  • the motor head 41 is fixedly mounted on the base rear crossbeam 113 .
  • An end of the motor link 44 is hinged to the motor slider 43 , and an opposite end thereof is hinged to the motor crossbar 40 .
  • the first footrest member 35 is folded under the seat. If the seat unit is switched from the sitting position shown in FIG. 4 to the TV position shown in FIG. 5 , the first leg link 31 and the third leg link 33 are rotated driven by the lateral plate 140 . During this process, the second leg link 32 and the fourth leg link 34 drive the first footrest member 35 to rotate upward.
  • the first footrest member 35 is raised, and the acute angle ⁇ formed between the footrest surface of the first footrest member 35 and the horizontal plane with its opening facing forward is, in this implementation, in a range of 16° to 19°. In some implementations, the acute angle ⁇ is 17°.
  • the mechanical stretching device further includes a first linkage member 141 , a second linkage member 142 , and a third linkage member 143 .
  • a middle of the second linkage member 142 is rotatably connected to the lateral plate 140 , an end of the second linkage member 142 is connected to an end of the first linkage member 141 , an opposite end of the first linkage member 141 is connected to the front swing rod 12 , an opposite end of the second linkage member 142 is connected to an end of the third linkage member 143 , and an opposite end of the third linkage member 143 is pivotally connected to the first leg link 31 of the leg stretching device 3 .
  • the backrest connecting member 20 of the backrest assembly 2 is upright upward at an angle ⁇ between the backrest attached to the backrest connecting member 20 and the horizontal plane.
  • the electric driving device 4 operates such that the motor slider 43 slides along the motor sliding rail 42 towards the motor head 41 , leading to a reduction in the distance between the motor head 41 and the motor slider 43 .
  • the motor slider 43 moves the lateral plate 140 forward, i.e., in a direction toward the leg stretching device 3 , through the motor link 44 , with the front swing rod 12 and the rear swing rod 13 swinging forward.
  • the first linkage member 141 moves forward with the front swing rod 12 and pushes the first leg link 31 with the second linkage member 142 and the third linkage member 143 ; and thus the leg stretching device 3 is unfolded.
  • the lateral plate driven member 17 and the seat linkage member 16 also move forward with the front swing rod 12 and drive the central linkage member 15 forward.
  • the central linkage member 15 moves forward together with the lateral plate 140 , thereby driving the backrest assembly 2 as a whole forward and downward through the first backrest link 21 and the second backrest link 22 , while the backrest connecting member 20 does not incline significantly, in which the first hinge point P 1 and the second hinge point P 2 both move downward and forward.
  • the electric driving device 4 continues to operate, causing the motor slider 43 to slide further towards the motor head 41 along the motor sliding rail 42 , so that the distance between the motor head 41 and the motor slider 43 is further reduced.
  • the motor slider 43 continues to move the lateral plate 140 forward, i.e., in a direction toward the leg stretching device 3 , through the motor link 44 , with the front swing rod 12 and the rear swing rod 13 swinging forward with a greater amplitude.
  • FIGS. 7 to 15 illustrate a second alternative embodiment according to the present disclosure, in which FIGS. 12 and 13 illustrate side views of a first improvement solution in the TV position and in the lying position, and FIGS. 14 and 15 illustrate side views of a second improvement solution in the TV position and in the lying position.
  • the leg stretching device 3 further includes a footrest extension assembly 38 , the footrest extension assembly 38 includes a first extension member 381 and a second extension member 382 , an end of the first extension member 381 is hinged to a middle of the second footrest member 37 , an opposite end of the first extension member 381 is hinged to an end of the second extension member 382 , an opposite end of the second extension member 382 is hinged to a middle of the second leg link 32 , and a middle of the second extension member 382 is hinged to a middle of the fourth leg link 34 .
  • the first footrest member 35 is hinged to the fourth leg link 34 through the driven rod 36 , the fourth leg link 34 is connected to the second footrest member 37 , and the first footrest member 35 is not connected to the fourth leg link 34 , increasing the flexibility of movement of the first footrest member 35 and the second footrest member 37 during retracting or stretching.
  • the first footrest member 35 , the driven rod 36 , the fourth leg link 34 , the second extension member 382 , and the second leg link 32 form a five linkage mechanism.
  • the first footrest member 35 can be more flexible to close or separate from the second footrest member 37 , increasing the distance between the first footrest member 35 and the second footrest member 37 after separation, and increasing the extension length of the second footrest member 37 .
  • the footrest surfaces of the first footrest member 35 and the second footrest member 37 are in the same plane, the first footrest member 35 and the second footrest member 37 are folded under the seat, and the first footrest member 35 is located above the second footrest member 37 .
  • a front end of the second footrest member 37 is raised, and the acute angle ⁇ formed between the footrest surface of the second footrest member 37 and the horizontal plane with its opening facing forward is, in this first improvement solution, in a range of 12° to 15°. In some implementations, the acute angle ⁇ is 13°.
  • the first leg link 31 and the third leg link 33 are rotated under the drive of the lateral plate 140 , causing the footrest extension assembly 38 to move from the retracted position shown in FIG. 11 to the limit position shown in FIG. 14 .
  • the front end of the second footrest member 37 is lowered, and the acute angle ⁇ formed between the footrest surface thereof and the horizontal plane with its opening facing backward is, in this second improvement, in a range of 12° to 20°. In some implementations, the acute angle ⁇ is 15°.
  • the user's legs can be lowered slightly without causing the legs to uncomfortably tilted upwards.
  • the mechanical stretching device includes a base assembly 11 , a seat assembly 1 , a backrest assembly 2 , and a leg stretching device 3 .
  • the backrest assembly 2 is hinged to a rear part of the seat assembly 1 and the leg stretching device 3 is hinged to a front part of the seat assembly 1 .
  • the seat assembly 1 is attached to a seat of the seat unit, the backrest assembly 2 is attached to a backrest of the seat unit, and the leg stretching device 3 is attached to a footrest of the seat unit.
  • the seat unit, or mechanical stretching device thereof, can be switched between a sitting position, a TV position, and/or a lying position by means of the relative movement of the seat assembly 1 , the backrest assembly 2 , and the leg stretching device 3 .
  • the backrest In the sitting position, the backrest is upright, and the footrest is folded under the seat; in the TV position, the backrest does not incline significantly backward, and the footrest is moved upward and forward to the front of the seat with the stretching of the leg stretching device; and in the lying position, the footrest remains extended to the front of the seat, and the backrest is reclined significantly backward.
  • the mechanical stretching device is configured to be applied to an iron frame floor-standing seat unit
  • the base assembly 11 supports the mechanical stretching device directly on the bottom surface, and includes two mirror-symmetrical base longitudinal beams 111 disposed on the left and right sides, and a base front crossbeam 112 and a base rear crossbeam 113 connecting the two base longitudinal beams 111 .
  • the base assembly 11 may also indirectly support the mechanical stretching device above the bottom surface, e.g., the base assembly 11 is rotatably mounted on the rotating base, or the base assembly 11 is fixedly coupled in position to the armrests of the seat unit with floor-standing armrests.
  • the seat assembly 1 includes a front swing rod 12 , a rear swing rod 13 , and a lateral plate 140 attached to the seat of the seat unit.
  • a lower end of the front swing rod 12 is hinged to a front end of the base longitudinal beam 111
  • a lower end of the rear swing rod 13 is hinged to a rear end of the base longitudinal beam 111 .
  • the backrest assembly 2 includes a backrest connecting member 20 attached to a backrest and a backrest link assembly pivotally connected to the backrest connecting member 20 .
  • the backrest link assembly includes a first backrest link 21 , a second backrest link 21 , a third backrest link 23 , a fourth backrest link 24 , and a fifth backrest link 25 .
  • An end of the first backrest link 21 is hinged to the central driven member 15
  • an end of the second backrest link 22 is hinged to a rear end of the lateral plate 140
  • the first backrest link 21 is hinged to the second backrest link 22 .
  • An opposite end of the second backrest link 22 is hinged to a lower end of the third backrest link 23
  • an upper end of the third backrest link 23 is hinged to a rear end of the backrest connecting member 20
  • An upper end of the fourth backrest link 24 is hinged to a front end of the backrest connecting member 20 at a first hinge point P 1
  • a front end of the fifth backrest link 25 is hinged to an opposite end of the first backrest link 21 at a second hinge point P 2
  • a rear end of the fifth backrest link 25 is hinged to a middle of the third backrest link 23
  • a lower end of the fourth backrest link 24 is hinged to a middle of the fifth backrest link 25 .
  • the leg stretching device 3 is composed of a plurality of links pivotally connected with each other, in which a rear end of the first leg link 31 is hinged to the lateral plate 140 , a front end of the first leg link 31 is hinged to a rear end of the second leg link 32 , a rear end of the third leg link 33 is hinged to a front end of the lateral plate 140 , a front end of the third leg link 33 is hinged to a rear end of the fourth leg link 34 , and a front end of the second leg link 32 and a front end of the fourth leg link 34 are hinged to the first footrest member 35 , respectively.
  • an electric driver 4 is also provided.
  • the first motor crossbar 401 is fixedly connected to the first leg link 31 of the leg stretching device 3
  • the second motor crossbar 402 and the third motor crossbar 403 are provided at the seat assembly, in particular, the second motor crossbar 402 is fixedly connected at the lateral plate 140
  • the third motor crossbar 403 is fixedly connected at the central driven member 15 .
  • the electric driving device 4 includes a first electric driver 404 coupled between the first motor crossbar 401 and the second motor crossbar 402 , and a second electric driver 405 coupled between the third motor crossbar 403 and the base rear crossbeam 113 of the base assembly 11 .
  • the first electric driver 404 and the second electric driver 405 are designed as linear electric drivers including, respectively, a motor head, a motor sliding rail fixedly connected to the motor head, and a motor slider 43 slidable relative to the motor head along the motor sliding rail.
  • the distance between the motor head and the motor slider 43 is changed by the sliding of the motor slider 43 along the motor sliding rail, so that the relative movement between the components coupled to the motor head and the components coupled to the motor slider 43 can be made possible by this retracting and stretching movement of the linear electric driver.
  • the seat unit is to be switched from the sitting position to the TV position, only the first electric driver 404 is caused to operate, in which the distance between the motor head 41 of the first electric driver 404 and the motor slider 43 is increased, so that the distance between the first motor crossbar 401 and the second motor crossbar 402 is increased, and the leg stretching device 3 is driven to be unfolded relative to the lateral plate 140 by the first leg link 31 , thereby switching the mechanical stretching device from the sitting position shown in FIG. 19 to the TV position shown in FIG. 20 .
  • the second electric driver 405 is operating, the distance between the motor head 41 of the second electric driver 405 and the motor slider 43 is increased, and the distance between the third motor crossbar 403 and the base rear crossbeam 113 is increased, so that the lateral plate 140 is pushed forward relative to the base assembly 11 by the central driven member 15 , that is, in a direction toward the leg stretching device 3 , and the front swing rod 12 and the rear swing rod 13 swing forward accordingly.
  • the lateral plate driven member 17 and the seat driven member 16 are also moved forward with the front swing rod 12 .
  • the seat unit may also be in other positions not specifically shown in the figures.
  • the backrest connecting member 20 causes the backrest to be reclined backward, while the first electric driver 404 is not operating, so that the leg stretching device is still folded below the seat.
  • FIGS. 22 to 28 illustrate a fourth alternative embodiment according to the present disclosure.
  • the leg stretching device 3 further includes a second footrest member 37 .
  • the leg stretching device 3 is composed of a plurality of links pivotally connected with each other, in which a rear end of the first leg link 31 is hinged to the lateral plate 140 , a front end of the first leg link 31 is hinged to a rear end of the second leg link 32 , a rear end of the third leg link 33 is hinged to a front end of the side plate 140 , a front end of the third leg link 33 is hinged to the a end of the fourth leg link 34 , a front end of the second leg link 32 is hinged to the first footrest member 35 , and a front end of the fourth leg link 34 is hinged to the second footrest member 37 .
  • the first footrest member 35 is hinged to an end of the driven rod 36 and an opposite end of the driven rod 36 is hinged to a middle of the fourth leg link 34 .
  • the leg stretching device 3 further includes a footrest extension assembly 38 , the footrest extension assembly 38 includes a first extension member 381 and a second extension member 382 , an end of the first extension member 381 is hinged to a middle of the second footrest member 37 , an opposite end of the first extension member 381 is hinged to an end of the second extension member 382 , an opposite end of the second extension member 382 is hinged to a middle of the second leg link 32 , and a middle of the second extension member 382 is hinged to a middle of the fourth leg link 34 .
  • FIGS. 26 to 28 exemplarily illustrate several positions of the mechanical stretching device of the fourth alternative embodiment.
  • the footrest surfaces of the first footrest member 35 and the second footrest member 37 are in the same plane, and the first footrest member 35 and the second footrest member 37 are folded under the seat, and the first footrest member 35 is located above the second footrest member 37 .
  • both the first footrest member 35 and the second footrest member 37 are stretched in front of the seat.
  • the first footrest member 35 and the second footrest member 37 remain in front of the seat, while the backrest connecting member 20 is reclined strongly backward.
  • the seat unit is switched from the sitting position shown in FIG. 26 to the TV position shown in FIG. 27 , only the first electric driver 404 is allowed to be stretched, causing the first motor crossbar 401 to drive the first leg link 31 and the third leg link 33 to rotate forward so that the footrest extension assembly 38 moves from the retracted position shown in FIG. 26 to the limit position shown in FIG. 27 .
  • the second leg link 32 drives the first footrest member 35 to rotate upward
  • the driven rod 36 is rotated with the first footrest member 35 , causing the first footrest member 35 more flexible to rotate while supporting the first footrest member 35
  • the fourth leg link 34 drives the second footrest member 37 and the footrest extension assembly 38 to extend forward and rotate upward until the second footrest member 37 is stretched to the limit position.
  • the footrest extension assembly 38 is stretched to the limit position shown in FIG. 27
  • the footrest surface of the second footrest member 37 is reclined upward with its front end. The TV position shown in FIG. 27 is thus achieved.
  • the second electric driver 405 is operated, in which the distance between the third motor crossbar 403 and the base rear crossbeam 113 is increased, thereby pushing the lateral plate 140 forward relative to the base assembly 11 by means of the central driven member 15 , that is, in a direction toward the leg stretching device 3 , with the front swing rod 12 and the rear swing rod 13 swinging forward.
  • the lateral plate driven member 17 and the seat driven member 16 are also moved forward with the front swing rod 12 .
  • the driving link 16 a Since the driving link 16 a is originally inclined backward at its upper end in the TV position, when the front swing rod 12 and the rear swing rod 13 swing forward, the driving link 16 a pivots forward at its upper end, supporting the seat driven member 16 to move forward and upward, thereby driving the central driven member 15 to rotate while moving forward, increasing the distance from a hinge point between the central driven member 15 and the first backrest link 21 to a hinge point between the lateral plate 140 and the second backrest link 22 , thereby causing the backrest link assembly itself to be compressed while moving forward and the backrest connecting member 20 to be reclined strongly backward.
  • leg stretching device 11 base assembly 31 first leg link 111 base longitudinal beam 32 second leg link 112 base front crossbeam 33 third leg link 113 base rear crossbeam 34 fourth leg link 12 front swing rod 35 first footrest member 13 rear swing rod 36 driven rod 140 lateral plate 37 second footrest member 141 first linkage member 38 footrest extension assembly 142 second linkage member 381 first extension member 143 third linkage member 382 second extension member 15 central driven member 4 electric driving device 16 seat driven member 40 motor crossbar 16a driving link 41 motor head 17 lateral plate driven member 42 motor sliding rail 18 first transmission member 43 motor slider 19 second transmission member 401 first motor crossbar 2 backrest assembly 402 second motor crossbar 20 backrest connecting member 403 third motor crossbar 21 first backrest link 404 first electric driver 22 second backrest link 405 second electric driver 23 third backrest link 44 motor link 24 fourth backrest link 25 fifth backrest link

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
US19/026,632 2023-10-27 2025-01-17 Mechanical stretching device for movable seat unit and seat unit Pending US20250151908A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
CN202322904449.8U CN221012563U (zh) 2023-10-27 2023-10-27 用于可活动的座椅单元的机械伸展装置及座椅单元
CN202322904449.8 2023-10-27
CN202322921168.3U CN221129340U (zh) 2023-10-27 2023-10-27 用于可活动的座椅单元的机械伸展装置及座椅单元
CN202322921168.3 2023-10-27
PCT/CN2024/127047 WO2025087331A1 (zh) 2023-10-27 2024-10-24 用于可活动的座椅单元的机械伸展装置及座椅单元

Related Parent Applications (1)

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PCT/CN2024/127047 Continuation WO2025087331A1 (zh) 2023-10-27 2024-10-24 用于可活动的座椅单元的机械伸展装置及座椅单元

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US20250151908A1 true US20250151908A1 (en) 2025-05-15

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ID=95023022

Family Applications (1)

Application Number Title Priority Date Filing Date
US19/026,632 Pending US20250151908A1 (en) 2023-10-27 2025-01-17 Mechanical stretching device for movable seat unit and seat unit

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US (1) US20250151908A1 (de)
EP (1) EP4570128A4 (de)
JP (1) JP2025536503A (de)
KR (1) KR20250034170A (de)
AU (1) AU2024287295A1 (de)

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US20240315453A1 (en) * 2023-03-23 2024-09-26 L&P Property Management Company High-leg recliner seating mechanism
US20240315452A1 (en) * 2023-03-23 2024-09-26 L&P Property Management Company High-leg recliner seating mechanism
US20240336167A1 (en) * 2023-04-06 2024-10-10 Camaco, LLC Constant center lounge seat
US20240374032A1 (en) * 2023-05-08 2024-11-14 Haining Heli Machinery& Technology Co., Ltd. Seat frame and seat with switchable sitting and lying positions
US20250187502A1 (en) * 2023-12-12 2025-06-12 Hyundai Motor Company Rotation mechanism and seat including the same
US20250288116A1 (en) * 2024-03-14 2025-09-18 Nine Wood Trading Co., Limited Adjustable sofa
US20250311848A1 (en) * 2024-04-05 2025-10-09 Industrias Nortecaucanas S.A.S Recliner chair with reclining mechanism and reclining mechanism assembly for venue bleachers
US12599235B2 (en) * 2021-08-17 2026-04-14 Dewertokin Technology Group Co., Ltd. Mechanical extension device and suspension mechanism thereof

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JPS6116708A (ja) * 1984-07-02 1986-01-24 前田　英世 自在椅子
US5503453A (en) * 1993-05-27 1996-04-02 La-Z-Boy Chair Company Two-way high-leg recliner
JP5634890B2 (ja) * 2011-01-17 2014-12-03 カリモク家具株式会社 椅子
CN102894699B (zh) * 2012-11-01 2015-05-20 锐迈机械科技（吴江）有限公司 一种活动座椅靠背随动装置
US9839297B2 (en) * 2014-03-28 2017-12-12 L&P Property Management Company Split ottoman linkage accomodating a chaise pad
US10881209B2 (en) * 2018-01-12 2021-01-05 L&P Property Management Company Recliner seating mechanism with seat extension
CN210008763U (zh) * 2019-04-30 2020-02-04 东莞市捷科五金有限公司 一种结构改进的背靠可触墙式沙发架
CN217161486U (zh) * 2021-10-27 2022-08-12 锐迈科技股份有限公司 用于可活动的座椅单元的机械伸展装置及座椅单元

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12599235B2 (en) * 2021-08-17 2026-04-14 Dewertokin Technology Group Co., Ltd. Mechanical extension device and suspension mechanism thereof
US20240315453A1 (en) * 2023-03-23 2024-09-26 L&P Property Management Company High-leg recliner seating mechanism
US20240315452A1 (en) * 2023-03-23 2024-09-26 L&P Property Management Company High-leg recliner seating mechanism
US20240336167A1 (en) * 2023-04-06 2024-10-10 Camaco, LLC Constant center lounge seat
US20240374032A1 (en) * 2023-05-08 2024-11-14 Haining Heli Machinery& Technology Co., Ltd. Seat frame and seat with switchable sitting and lying positions
US12569066B2 (en) * 2023-05-08 2026-03-10 Haining Heli Machinery & Technology Co., Ltd. Seat frame and seat with switchable sitting and lying positions
US20250187502A1 (en) * 2023-12-12 2025-06-12 Hyundai Motor Company Rotation mechanism and seat including the same
US20250288116A1 (en) * 2024-03-14 2025-09-18 Nine Wood Trading Co., Limited Adjustable sofa
US20250311848A1 (en) * 2024-04-05 2025-10-09 Industrias Nortecaucanas S.A.S Recliner chair with reclining mechanism and reclining mechanism assembly for venue bleachers

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EP4570128A4 (de) 2025-12-10
AU2024287295A1 (en) 2025-05-15
EP4570128A1 (de) 2025-06-18
JP2025536503A (ja) 2025-11-07

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