CN221012563U - Mechanical stretching device for a movable seat unit and seat unit - Google Patents

Abstract

The utility model relates to a mechanical stretching device for a movable seating unit, comprising: the seat assembly comprises a base assembly, a side plate and a central linkage piece; a backrest assembly pivotally connected to a rear portion of the side panels; a leg extension device pivotally connected to the front of the side panel, including a first foot rest; the mechanical extension means enables the seating unit to be converted between a sitting position in which the first footrests are each stowed beneath the seat, and a lying position; in the recumbent position, the highest point of the footstool is higher than the highest point of the backrest, wherein the first foot rest extends forward and upward, and the utility model further relates to a movable seating unit.

Description

Mechanical stretching device for a movable seat unit and seat unit

Technical Field

The present utility model relates to a mechanical stretcher for a movable seating unit and a seating unit including the mechanical stretcher.

Background

A variety of seating units for use in a mobile seating unit are known in the art, such as sofas or seats with multiple position changing functions. Along with the improvement of the living standard of people, the comfort requirements on sofas and seats are also increasingly improved. In known designs, the movable seating units are generally provided with mechanical extension means, whereby the seating units can be shifted between a sitting position, a TV position (or rest position) and a lying position, the footrests of the seating units extending forward when the seating units are shifted from the sitting position to the TV position, the angle between the backrest and the seat being substantially unchanged, the footrests being further raised forward and upwards than in the rest position when the seating units are shifted from the rest position to the lying position, the backrest being significantly reclined such that the legs of the user of the seating units are higher than the heads in the lying position, a so-called "zero gravity" sensation being experienced.

However, a disadvantage in the known designs is that with the change of the seat unit into the recumbent position, a gap is present between the backrest and the seat, which on the one hand pulls the user's coat upwards and on the other hand leads to a risk of items falling out of the gap.

Disclosure of utility model

The utility model aims to solve the technical problem of providing a seat unit which has a simple structure and is more in line with human engineering mechanics.

To solve the above technical problem, the present utility model provides a mechanical stretching device for a movable seat unit, comprising:

-a seat assembly comprising a base assembly, a side plate attached to the seat of the seating unit, a central linkage coupled between the base assembly and the side plate;

-a backrest assembly pivotally connected to the rear of the side plate, comprising a backrest connector for attaching a backrest of a seat unit and a backrest link assembly pivotally connected to the backrest connector, the backrest link assembly comprising a first backrest link hinged to the central linkage and a second backrest link hinged to the side plate, wherein the first backrest link is hinged to the second backrest link;

-a leg extension means pivotally connected to the front of the side panel comprising a plurality of links pivotally connected to each other, a first foot rest for attaching a footrest;

The mechanical extension means enable the seat unit to be transformed between a sitting position in which the first footrest is stowed under the seat, a TV pose position and/or a recumbent position; in the TV pose position, the first foot rest extends forward; in the recumbent position, the backrest is reclined with the highest point of the footrest being higher than the highest point of the backrest, with the first foot rest extending forward and upward.

In this embodiment, the backrest is preferably tilted back in the recumbent position by at least 35 °, particularly preferably by at least 40 °, compared to the sitting position. Thereby providing a more comfortable zero gravity experience for the user.

In an alternative embodiment, in the recumbent position, the first foot rest is raised with its front end such that the foot rest face of the first foot rest forms an acute angle between 10 ° and 23 ° with the horizontal plane, preferably such that the foot rest face of the first foot rest forms an acute angle between 16 ° and 19 ° with the horizontal plane.

It is noted that the acute angle of the "opening forward" as used herein refers to the direction of the enclosed acute angle opening toward the leg extension means.

In another alternative embodiment, the leg extension device further comprises a second foot rest, both the first foot rest and the second foot rest being stowed under the seat in the sitting position; in the TV pose position, the first foot rest and the second foot rest extend forward; in the recumbent position, the backrest is reclined with the highest point of the footstool being higher than the highest point of the backrest, wherein both the first foot rest and the second foot rest extend forward and upward, wherein the second foot rest is located in front of the first foot rest.

In a first development of this alternative embodiment, in the recumbent position the second foot rest is raised with its front end such that the foot rest surface of the second foot rest forms an acute angle between 10 ° and 23 ° with the horizontal plane, particularly preferably such that the foot rest surface of the second foot rest forms an acute angle between 12 ° and 15 ° with the horizontal plane.

In a second development of this alternative embodiment, in the recumbent position the second foot rest is suspended with its front end such that the foot rest surface of the second foot rest forms an acute angle of between 8 ° and 30 ° with the horizontal plane, preferably the foot rest surface of the second foot rest forms an angle of between 12 ° and 20 ° with the horizontal plane.

It is noted that the acute angle "opening rearward" as used herein refers to the direction of the enclosed acute angle opening toward the backrest assembly.

According to a preferred embodiment, the first foot rest is connected with the second foot rest by a foot rest extension assembly comprising a first extension and a second extension hinged to each other.

In this embodiment, one end of the first extension member is hinged to the second leg rest at the distal end, the other end of the second extension member is hinged to one end of the second extension member, the other end of the second extension member is hinged to the leg link of the first leg rest connected to the proximal end, and the front end of the second leg rest is raised or drooped in the recumbent position by adjusting the hinge position of the first extension member and the second leg rest, so that the corresponding leg rest surface forms an angle with the horizontal plane that is comfortable for the user.

Further, in this embodiment, the backrest link is coupled to the seat assembly by the backrest link assembly, and the backrest link assembly compresses itself at the same time as the backrest link is compressed by the scissor structure of the backrest link assembly. Thereby eliminating a gap that may occur between the backrest and the seat portion during the posture change of the seat unit. The novel zero-back-rubbing type clothes hanger not only realizes a real zero-back-wall structure, saves installation space and eliminates the falling risk of articles caused by gaps, but also avoids pulling out the upper clothes of a user, and realizes comfortable experience of zero back rubbing.

According to a preferred embodiment, the backrest link assembly further comprises a third backrest link, a fourth backrest link and a fifth backrest link, wherein the lower end of the third backrest link is hinged to the second backrest link, the upper end of the third backrest link is hinged to the rear end of the backrest link, the upper end of the fourth backrest link is hinged to the front end of the backrest link at a first pivot point, the front end of the fifth backrest link is hinged to the first backrest link at a second pivot point, the rear end of the fifth backrest link is hinged to the middle of the third backrest link, and the lower end of the fourth backrest link is hinged to the middle of the fifth backrest link.

According to a preferred embodiment, the backrest link is reclined by compression of the backrest link assembly during the transition of the seat unit from the sitting position to the lying position.

According to a preferred embodiment, the relative movement between the side plates and the central linkage during the transition of the seat unit from the sitting position to the lying position causes an increase in the distance between the hinge points of the first backrest link and the central linkage and the hinge points of the second backrest link and the side plates, thereby achieving compression of the backrest link assembly.

According to a preferred embodiment, both the first pivot point and the second pivot point are moved forward during the transition of the seat unit from the sitting position to the lying position, wherein the distance between the first pivot point and the second pivot point decreases.

According to a preferred embodiment, the seat assembly further comprises a front swing link, a rear swing link, a seat linkage and a side plate linkage, wherein the lower ends of the front swing link and the rear swing link are respectively and pivotally connected with the base assembly, and the upper ends of the front swing link and the rear swing link are connected with the side plate through a central linkage, the seat linkage and the side plate linkage.

According to a preferred embodiment, the seat unit is converted between a sitting position and a lying position by the swinging of the side plates relative to the base assembly causing movement of the backrest assembly and the leg extension means relative to the seat assembly.

According to a preferred embodiment, the mechanical stretching device further comprises an electric drive coupled between the base assembly and the side plate.

In order to solve the above technical problem, the present utility model further provides a seat unit, including:

-a seat;

-a backrest;

-a footrest; and

-A mechanical stretching device comprising:

-a seat assembly comprising a base assembly, a side plate attached to the seat, a central linkage coupled between the base assembly and the side plate;

-a back link assembly pivotally connected to the rear of the side plate, comprising a back link for attaching the back and a back link assembly pivotally connected to the back link, the back link assembly comprising a first back link hinged to the central link and a second back link hinged to the side plate, wherein the first back link is hinged to the second back link;

-a leg extension means pivotally connected to the front of the side panel comprising a plurality of links pivotally connected to each other, a first foot rest for attaching a footrest;

The seat unit being convertible between a sitting position, in which the first footrest is stowed under the seat, a TV position and/or a lying position; in the TV pose position, the first foot rest extends forward; in the recumbent position, the backrest is reclined with the highest point of the footrest being higher than the highest point of the backrest, with the first foot rest extending forward and upward.

In this embodiment, the backrest is preferably tilted back in the recumbent position by at least 35 °, particularly preferably by at least 40 °, compared to the sitting position. Thereby providing a more comfortable zero gravity experience for the user. In an alternative embodiment, in the recumbent position, the first foot rest is raised with its front end such that the foot rest face of the first foot rest forms an acute angle between 10 ° and 23 ° with the horizontal plane, preferably such that the foot rest face of the first foot rest forms an acute angle between 16 ° and 19 ° with the horizontal plane.

In another alternative embodiment, the leg extension device further comprises a second foot rest, both the first foot rest and the second foot rest being stowed under the seat in the sitting position; in the TV pose position, the first foot rest and the second foot rest extend forward; in the recumbent position, the backrest is reclined with the highest point of the footstool being higher than the highest point of the backrest, wherein both the first foot rest and the second foot rest extend forward and upward, wherein the second foot rest is located in front of the first foot rest.

In a first development of this alternative embodiment, in the recumbent position the second foot rest is raised with its front end such that the foot rest surface of the second foot rest forms an acute angle between 10 ° and 23 ° with the horizontal plane, particularly preferably such that the foot rest surface of the second foot rest forms an acute angle between 12 ° and 15 ° with the horizontal plane.

In a second development of this alternative embodiment, in the recumbent position the second foot rest is suspended with its front end such that the foot rest surface of the second foot rest forms an acute angle of between 8 ° and 30 ° with the horizontal plane, preferably the foot rest surface of the second foot rest forms an angle of between 12 ° and 20 ° with the horizontal plane.

According to a preferred embodiment, the first foot rest is connected with the second foot rest by a foot rest extension assembly comprising a first extension and a second extension hinged to each other.

According to a preferred embodiment, the backrest link assembly further comprises a third backrest link, a fourth backrest link and a fifth backrest link, wherein the lower end of the third backrest link is hinged to the second backrest link, the upper end of the third backrest link is hinged to the rear end of the backrest link, the upper end of the fourth backrest link is hinged to the front end of the backrest link at a first pivot point, the front end of the fifth backrest link is hinged to the first backrest link at a second pivot point, the rear end of the fifth backrest link is hinged to the middle of the third backrest link, and the lower end of the fourth backrest link is hinged to the middle of the fifth backrest link.

According to a preferred embodiment, the backrest link is reclined by compression of the backrest link assembly during the transition of the seat unit from the sitting position to the lying position.

According to a preferred embodiment, the relative movement between the side plates and the central linkage during the transition of the seat unit from the sitting position to the lying position causes an increase in the distance between the hinge points of the first backrest link and the central linkage and the hinge points of the second backrest link and the side plates, thereby achieving compression of the backrest link assembly.

According to a preferred embodiment, both the first pivot point and the second pivot point are moved forward during the transition of the seat unit from the sitting position to the lying position, wherein the distance between the first pivot point and the second pivot point decreases.

According to a preferred embodiment, the seat assembly further comprises a front swing link, a rear swing link, a seat linkage and a side plate linkage, wherein the lower ends of the front swing link and the rear swing link are respectively and pivotally connected with the base assembly, and the upper ends of the front swing link and the rear swing link are connected with the side plate through a central linkage, the seat linkage and the side plate linkage.

According to a preferred embodiment, the seat unit is converted between a sitting position and a lying position by the swinging of the side plates relative to the base assembly causing movement of the backrest assembly and the leg extension means relative to the seat assembly.

According to a preferred embodiment, the seating unit further comprises an electric drive coupled between the base assembly and the side panel.

Drawings

Embodiments of the present utility model are described in detail below with reference to the drawings.

FIG. 1 is a perspective view of a mechanical stretcher according to one embodiment of the present utility model in a seated position;

FIG. 2 is a perspective view of the mechanical stretcher of FIG. 1 in a TV pose position;

FIG. 3 is a perspective view of the mechanical stretcher of FIG. 1 in a recumbent position;

FIG. 4 is a side view of the mechanical stretcher of FIG. 1;

FIG. 5 is a side view of the mechanical stretcher of FIG. 1 in a TV pose position;

FIG. 6 is a side view of the mechanical stretcher of FIG. 1 in a recumbent position;

FIG. 7 is a perspective view of a mechanical stretcher according to an alternative embodiment of the present utility model in a seated position;

FIG. 8 is a perspective view of the mechanical stretcher of FIG. 7 in a TV pose position;

FIG. 9 is a perspective view of the mechanical stretcher of FIG. 7 in a recumbent position;

FIG. 10 is a side view of the mechanical stretcher of FIG. 7;

FIG. 11 is another angled side view of the mechanical stretcher of FIG. 10;

FIG. 12 is a mechanical stretcher of a first modification of the alternative embodiment shown in FIG. 7, in a TV pose position;

FIG. 13 is a side view of the mechanical stretcher of FIG. 12 in a recumbent position;

FIG. 14 is a mechanical stretcher of a second modification of the alternative embodiment shown in FIG. 7, in a TV pose position;

fig. 15 is a side view of the mechanical stretcher of fig. 14 in a recumbent position.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the utility model. In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may include one or more of the feature, either explicitly or implicitly. Moreover, the terms "first," "second," and the like, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.

As referred to herein, "forward" or "forward of the seat unit" or "forward of the mechanical extension means" refers to a direction toward the leg extension means based on the seat unit, unless otherwise indicated; accordingly, references herein to "rearward" or "rearward of a seat unit" or "rearward of a mechanical extension device" refer to a direction toward the backrest assembly based on the seat unit.

An embodiment of a mechanical stretching device for a movable seating unit is schematically shown first of all in fig. 1 to 6.

The mechanical extension device comprises a seat assembly 1, a backrest assembly 2 and a leg extension device 3. The backrest assembly 2 is hinged to the rear of the seat assembly 1 and the leg extension means 3 is hinged to the front of the seat assembly 1. The seat assembly 1 is attached to the seat of the seat unit, the backrest assembly 2 is attached to the backrest of the seat unit, and the leg extension device 3 is attached to the footrest of the seat unit. By means of a relative movement of the seat assembly 1, the backrest assembly 2 and the leg extension means 3, the seat unit or its mechanical extension means can be shifted between a sitting position, a TV position and/or a lying position. In the sitting position, the backrest is upright and the footrest is folded under the seat; in the TV position, the backrest does not tilt significantly rearward, the footrest moves upward and forward to the front of the seat as the leg extension device extends; in the recumbent position, the footrest remains extended to the front of the seat while the backrest is inclined significantly rearward.

The seat assembly 1 includes a base assembly 11, a front swing link 12, a rear swing link 13, and a side plate 140 attached to the seat of the seat unit.

In the embodiment shown in fig. 1, which is used for a floor-standing seating unit of an iron frame, the base assembly 11 directly supports the mechanical extension on the bottom surface and includes two mirror-symmetrical base stringers 111 provided on the left and right sides and a base front cross member 112 and a base rear cross member 113 connecting the two base stringers 111. However, in an embodiment not shown, the base assembly 11 may also indirectly support the mechanical extension device above the floor, for example, the base assembly 11 may be rotatably mounted on a rotating base, or the base assembly 11 may be fixedly coupled to the armrest portion of the floor-standing seating unit.

In the embodiment shown in fig. 1, the front swing link 112 is hinged at its lower end to the front end of the base longitudinal beam 111, and the rear swing link 113 is hinged at its lower end to the rear end of the base longitudinal beam 111. The side plate 140 is movable relative to the base assembly 11, for which purpose in this embodiment the seat assembly 1 further comprises a central linkage 15, a seat linkage 16 and a side plate linkage 17, wherein the central linkage 15 is provided with a plurality of pivot points, with which the central linkage 15 is hinged to the backrest assembly 2, to the side plate 140, to the seat linkage 16 and to the rear swing link 13, respectively. One end of the seat linkage member 16 is connected with the front swing rod 12 through the side plate linkage member 17, and the other end of the seat linkage member 16 is connected with the central linkage member 15. Thus, the side plate 140 can be driven to move relative to the base assembly 11 by the swing of the front swing link 12 and the rear swing link 13, and then the backrest assembly 2 is driven to move.

The backrest assembly 2 comprises a backrest connector 20 attached to the backrest and a backrest link assembly pivotably connected to the backrest connector 20, said backrest link assembly comprising 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. One end of the first backrest link 21 is hinged to the central linkage 15, and one end of the second backrest link 22 is hinged to the rear end of the side plate 140, wherein the first backrest link 21 is hinged to the second backrest link 22. The other end of the second backrest link 22 is hinged to the lower end of the third backrest link 23, and the upper end of the third backrest link 23 is hinged to the rear end of the backrest link 20. The upper end of the fourth backrest link 24 is hinged with the front end of the backrest link 20 at the first pivot point P1, the front end of the fifth backrest link 25 is hinged with the other end of the first backrest link 21 at the second pivot point P2, the rear end of the fifth backrest link 25 is hinged with the middle of the third backrest link 23, and the lower end of the fourth backrest link 24 is hinged with the middle of the fifth backrest link 25.

As shown in fig. 4 to 7, the leg extension device 3 is constituted by a plurality of links pivotally connected to each other, wherein the rear end of the first leg link 31 is hinged to the side plate 140, the front end of the first leg link 31 is hinged to the rear end of the second leg link 32, the rear end of the third leg link 33 is hinged to the front end of the side plate 140, the front end of the third leg link 33 is hinged to the rear end of the fourth leg link 34, and the front ends of the second leg link 32 and the fourth leg link 34 are respectively hinged to the first leg rest 35.

The mechanical stretching device further comprises a first transmission member 18 and a second transmission member 19 pivotally connected to each other, one end of the first transmission member 18 being hinged to one end of the second transmission member 19, the other end of the first transmission member 18 being hinged to the side plate 140, the other end of the second transmission member 19 being hinged to the leg stretching device 3, in particular to the first leg link 31. Thus, the side panels 140 of the seat assembly 1 move relative to the base assembly 11, bringing about the retraction and extension movements of the leg extension device 3.

To enable the seat unit to be changed between different positions, an electric drive 4 is also provided. The side plate 140 comprises a motor cross bar 40 fixedly connected at its inner side, and the electric drive 4 is coupled between said motor cross bar 40 and the base front cross bar 112 of the base assembly 11. The drive means 4 are preferably designed as linear electric drives, by means of which the side plates 140 can be moved relative to the base assembly 11 and thus the backrest assembly 2 and the leg extension means 3, so that the seat unit can be changed between different positions, for example between a sitting position, a TV position and a lying position.

The electric drive 4 is in this embodiment designed to cause the mechanical extension means of the seat unit to change between a sitting position, a TV position and a lying position. The electric drive device 4 comprises a motor head 41, a motor sliding rail 42 fixedly connected with the motor head 41, a motor sliding block 43 and a motor connecting rod 44, wherein the motor sliding block 43 can slide along the motor sliding rail 42 relative to the motor head 41. The motor head 41 is fixedly mounted on the base rear cross beam 113, one end of a motor connecting rod 44 is hinged with the motor sliding block 43, and the other end is hinged with the motor cross rod 40.

As shown in fig. 4-6, in the seated position shown in fig. 4, the first foot rest 35 is folded under the seat. If the seat unit is shifted 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 by the side plates 140. In the process, second leg link 32 and fourth leg link 34 rotate first foot rest 35 upwardly. When the seat unit is shifted from the TV position shown in fig. 5 to the lying position shown in fig. 6, the first footrest 35 is raised and the footrest surface of the first footrest 35 forms an acute angle α forward with respect to the horizontal plane, which acute angle α is 16 ° to 19 °, in this embodiment, particularly preferably 17 °.

The mechanical stretcher further includes a first linkage 141, a second linkage 142, and a third linkage 143. The middle part of the second linkage member 142 is rotatably connected with the side plate 140, one end of the second linkage member 142 is connected with one end of the first linkage member 141, the other end of the first linkage member 141 is connected with the front swing link 12, the other end of the second linkage member 142 is connected with one end of the third linkage member 143, and the other end of the third linkage member 143 is pivotably connected with the first leg link 31 of the leg stretching device 3.

When the mechanical stretcher is in the sitting position shown in fig. 4, the back link 20 of the back assembly 2 stands up, forming an angle β with the horizontal plane with the back attached to the back link 20.

During the transition of the mechanical stretching device from the sitting position shown in fig. 4 to the TV position shown in fig. 5, the electric drive 4 is operated such that the motor slider 43 slides along the motor slide 42 towards the motor head 41 such that the distance between the motor head 41 and the motor slider 43 decreases. In the process, the motor slider 43 moves the side plate 140 forward, i.e., in the direction of the leg extension device 3, through the motor link 44, and the front swing link 12 and the rear swing link 13 swing forward. Thereby, the first link 141 moves forward with the front swing link 12, and pushes the first leg link 31 with the second link 142 and the third link 143; and thereby the leg extension device 3. The side plate interlocking piece 17 and the seat interlocking piece 16 also move forward along with the front swing rod 12 and drive the central interlocking piece 15 to move forward. In this process, the central linkage 15 moves forward along with the side plates 140, and the backrest assembly 2 is moved forward and downward as a whole by the first backrest link 21 and the second backrest link 22, without the backrest connecting member 20 being significantly tilted, wherein the first pivot point P1 and the second pivot point P2 move downward and forward.

During the transition of the mechanical stretching device from the TV position shown in fig. 5 to the lying position shown in fig. 6, the electric drive 4 continues to operate, so that the motor slider 43 slides further along the motor slide 42 towards the motor head 41, so that the distance between the motor head 41 and the motor slider 43 is further reduced. During this process, the motor slider 43 continues to move the side plate 140 forward, i.e. in the direction of the leg extension 3, via the motor link 44, with the front pendulum rod 12 and the rear pendulum rod 13 swinging forward with a greater extent. When the front swing link 12 and the rear swing link 13 swing to the maximum extent, the side plate 140 moves significantly forward with respect to the center link 15, thereby increasing the distance between the hinge point of the center link 15 and the first backrest link 21 and the hinge point of the side plate 140 and the second backrest link 22, and further causing the backrest link assembly to move forward while the backrest link assembly itself compresses and the backrest link 20 tilts strongly rearward. In the process, not only the first pivot point P1 and the second pivot point P2 are both moved forward, but also the distance between the first pivot point P1 and the second pivot point P2 is significantly reduced compared to in the sitting position and in the TV position. The backrest connector 20 is attached to the backrest of the seat unit, and the angle β of the backrest to the horizontal increases by at least 40 ° during the transition of the seat unit from the sitting position to the lying position.

Fig. 7 to 15 show an alternative embodiment according to the present application, wherein fig. 12 and 13 show side views of a TV pose and a lying position of a first modification, and fig. 14 and 15 show side views of a TV pose and a lying position of a second modification.

Unlike the embodiment shown in fig. 1 to 6, the leg extension device 3 of this alternative embodiment further comprises a second foot rest 37. The leg extension device 3 is constituted by a plurality of links pivotally connected to each other, wherein the rear end of the first leg link 31 is hinged to the side plate 140, the front end of the first leg link 31 is hinged to the rear end of the second leg link 32, the rear end of the third leg link 33 is hinged to the front end of the side plate 140, the front end of the third leg link 33 is hinged to the rear end of the fourth leg link 34, the front end of the second leg link 32 and the front end of the fourth leg link 34 are respectively hinged to the first footrest 35, and the front end of the fourth leg link 34 is hinged to the second footrest 37. The first foot rest 35 is hinged to one end of the link 36, and the other end of the link 36 is hinged to the middle of the fourth leg link 34.

Leg extension apparatus 3 further includes leg rest extension assembly 38, leg rest extension assembly 38 including a first extension 381 and a second extension 382, first extension 381 being hinged at one end to a central portion of second leg rest 37, the other end of first extension 381 being hinged at one end of second extension 382, the other end of second extension 382 being hinged at a central portion of second leg link 32, the central portion of second extension 382 being hinged at a central portion of fourth leg link 34.

In this alternative embodiment, first foot rest 35 is hinged with fourth leg link 34 via trace 36, the fourth leg link is connected with the second foot rest, first foot rest 35 is not connected with the fourth leg link, and flexibility of movement of the first foot rest and the second foot rest during retraction or extension is increased. The first foot rest 35, the linkage rod 36, the fourth leg connecting rod 34, the second extension piece 382 and the second leg connecting rod 32 form a five-bar mechanism, the first foot rest can be more flexibly close to or separated from the second foot rest, the distance between the first foot rest and the second foot rest after separation is increased, and the extension length of the second foot rest is increased.

According to a first modification of the alternative embodiment, in the sitting position as shown in fig. 11, the footrest surfaces of the first footrest 35 and the second footrest 37 are in the same plane, and the first footrest 35 and the second footrest 37 are folded under the seats, and the first footrest 35 is located above the second footrest 37. If the seat unit is changed from the sitting position shown in fig. 11 to the lying position shown in fig. 13, the front end of the second foot rest 37 is raised and the foot rest surface of the second foot rest 37 forms an acute angle α forward with respect to the horizontal plane, which angle α is preferably 12 ° to 15 °, particularly preferably 13 °.

According to a second modification of the alternative embodiment, if the seat unit is changed from the sitting position shown in fig. 11 to the TV pose position shown in fig. 14, the first leg link 31 and the third leg link 33 are rotated by the side plates 140, so that the leg rest extension assembly 38 is moved from the retracted position shown in fig. 11 to the extreme position shown in fig. 14, during which the second leg link 32 rotates the first leg rest 35 upward, the link 36 rotates with the first leg rest 35, so that the first leg rest 35 is supported while rotating more flexibly, and the fourth leg link 34 rotates the second leg rest 37 and the leg rest extension assembly 38 forward and upward until the second leg rest 37 extends to the extreme position. When leg rest extension assembly 38 is extended to the extreme position shown in fig. 14, the leg rest surface of first leg rest 35 is in a substantially horizontal position and the leg rest surface of second leg rest 37 is inclined downwardly at its forward end. In the recumbent position shown in fig. 15, the second foot rest 37 depends with its front end, its foot rest surface forming an acute angle α with the horizontal plane, which opening is directed rearward, in this second variant the acute angle α preferably being 12 ° to 20 °, particularly preferably 15 °. The user can slightly drop the legs in the TV pose position of the seat unit without uncomfortable excessive upturned legs.

The foregoing description has fully disclosed specific embodiments of this utility model. It should be noted that any modifications to the specific embodiments of the utility model may be made by those skilled in the art without departing from the scope of the utility model as defined in the appended claims. Accordingly, the scope of the claims of the present utility model is not limited to the foregoing detailed description.

List of reference numerals

1. Seat assembly

11. Base assembly

111. Base longitudinal beam

112. Front cross beam of base

113. Base rear cross beam

12. Front swing rod

13. Rear swing rod

140. Side plate

141. First linkage member

142. Second linkage member

143. Third linkage member

15. Central linkage

16. Seat part linkage piece

17. Side plate linkage piece

18. First transmission member

19. Second transmission member

2. Backrest assembly

20. Backrest connecting piece

21. First backrest connecting rod

22. Second backrest connecting rod

23. Third backrest connecting rod

24. Fourth backrest connecting rod

25. Fifth backrest connecting rod

3. Leg stretching device

31. First leg connecting rod

32. Second leg link

33. Third leg connecting rod

34. Fourth leg link

35. First foot rest

36. Linkage rod

37. Second foot rest

38. Foot rest extension assembly

381. First extension piece

382. Second extension piece

4. Electric drive device

40. Motor cross bar

41. Motor head

42. Motor slide rail

43. And a motor connecting rod.

Claims (36)

1. A mechanical stretcher for a movable seating unit, comprising:

-a seat assembly comprising a base assembly, a side plate attached to the seat of the seating unit, a central linkage coupled between the base assembly and the side plate;

-a backrest assembly pivotally connected to the rear of the side plate (140) comprising a backrest link for attaching a backrest of a seat unit and a backrest link assembly pivotally connected to the backrest link, the backrest link assembly comprising a first backrest link hinged to the central link and a second backrest link hinged to the side plate, wherein the first backrest link is hinged to the second backrest link;

-a leg extension means pivotally connected to the front of the side panel comprising a plurality of links pivotally connected to each other, a first foot rest for attaching a footrest;

The mechanical extension means enable the seat unit to be transformed between a sitting position in which the first footrest is stowed under the seat, a TV pose position and/or a recumbent position; in the TV pose position, the first foot rest extends forward; in the recumbent position, the backrest is reclined with the highest point of the footrest being higher than the highest point of the backrest, with the first foot rest extending forward and upward.

2. The mechanical stretching device of claim 1, wherein the backrest is tilted rearward in the recumbent position at least 35 ° compared to the sitting position.

3. The mechanical stretching device of claim 2, wherein the backrest is tilted rearward in the recumbent position by at least 40 ° compared to the sitting position.

4. The mechanical extension device of claim 1, wherein in the recumbent position the first foot rest is raised with its forward end such that the foot rest face of the first foot rest is at an acute angle between 10 ° and 23 ° open forward from horizontal.

5. The mechanical extension device of claim 4, wherein in the recumbent position the first leg rest is raised at its forward end such that the foot rest face of the first leg rest is at an acute angle between 16 ° and 19 ° open forward from horizontal.

6. The mechanical extension device of claim 1, further comprising a second foot rest, wherein in the seated position, both the first foot rest and the second foot rest are stowed below the seat; in the TV pose position, the first foot rest and the second foot rest extend forward; in the recumbent position, the backrest is reclined with the highest point of the footstool being higher than the highest point of the backrest, wherein both the first foot rest and the second foot rest extend forward and upward, wherein the second foot rest is located in front of the first foot rest.

7. The mechanical extension device of claim 6, wherein in the recumbent position the second foot rest is raised with its forward end such that the foot rest face of the second foot rest is at an acute angle between 10 ° and 23 ° open forward from horizontal.

8. The mechanical extension device of claim 7, wherein in the recumbent position the second foot rest is raised with its forward end such that the foot rest face of the second foot rest is at an acute angle between 12 ° and 15 ° open forward from horizontal.

9. The mechanical extension device of claim 6, wherein in the recumbent position the second foot rest is sagged with its front end such that the foot rest face of the second foot rest is at an acute angle between 8 ° and 30 ° open rearward from horizontal.

10. The mechanical extension device of claim 9, wherein in the recumbent position the foot rest surface of the second foot rest is at an angle of between 12 ° and 20 ° to horizontal.

11. The mechanical extension device of claim 6, wherein the first foot rest is connected to the second foot rest by a foot rest extension assembly comprising a first extension member and a second extension member hinged to each other.

12. The mechanical stretcher of claim 1, wherein the back link assembly further comprises a third back link, a fourth back link, and a fifth back link, wherein a lower end of the third back link is hinged to the second back link, an upper end of the third back link is hinged to a rear end of the back link, an upper end of the fourth back link is hinged to a front end of the back link at a first pivot point, a front end of the fifth back link is hinged to the first back link at a second pivot point, a rear end of the fifth back link is hinged to a middle of the third back link, and a lower end of the fourth back link is hinged to a middle of the fifth back link.

13. The mechanical stretcher of claim 12 wherein the back link is reclined by compression of the back link assembly during shifting of the seat unit from the seating position to the reclined position.

14. The mechanical stretcher according to claim 13 wherein the relative movement between the side plates and the center linkage during the transition of the seat unit from the seating position to the lie position increases the distance between the hinge points of the first and center links and the hinge points of the second and side plates to effect compression of the back link assembly.

15. The mechanical stretcher according to claim 12 wherein the first pivot point and the second pivot point each move forward during the transition of the seat unit from the sitting position to the lying position, wherein the distance between the first pivot point and the second pivot point decreases.

16. The mechanical stretching device of claim 1, wherein the seat assembly further comprises a front swing link, a rear swing link, a seat linkage and a side plate linkage, wherein lower ends of the front swing link and the rear swing link are pivotably connected to the base assembly, respectively, and upper ends of the front swing link and the rear swing link are connected to the side plate through a center linkage, a seat linkage and a side plate linkage.

17. The mechanical extension device of claim 16 wherein the seat unit is converted between the sitting and reclined positions by the swinging of the side plates relative to the base assembly to urge movement of the backrest assembly and leg extension device relative to the seat assembly.

18. The mechanical stretcher of claim 1 further comprising an electric drive coupled between the base assembly and the side plate.

19. A seating unit comprising:

-a seat;

-a backrest;

-a footrest; and

-A mechanical stretching device comprising:

-a seat assembly comprising a base assembly, a side plate attached to the seat, a central linkage coupled between the base assembly and the side plate;

-a backrest assembly pivotally connected to a rear portion of the side plate (140) comprising a backrest link for attaching the backrest and a backrest link assembly pivotally connected to the backrest link, the backrest link assembly comprising a first backrest link hinged to the central link and a second backrest link hinged to the side plate, wherein the first backrest link is hinged to the second backrest link;

-a leg extension means pivotally connected to the front of the side panel comprising a plurality of links pivotally connected to each other, a first foot rest for attaching a footrest;

The seat unit being convertible between a sitting position, in which the first footrest is stowed under the seat, a TV position and/or a lying position; in the TV pose position, the first foot rest extends forward; in the recumbent position, the backrest is reclined with the highest point of the footrest being higher than the highest point of the backrest, with the first foot rest extending forward and upward.

20. The seating unit defined in claim 19, wherein the back is reclined at least 35 ° in the reclined position as compared to the seated position.

21. The seating unit defined in claim 20, wherein the back is reclined at least 40 ° in the reclined position as compared to the seated position.

22. A seating unit as claimed in claim 19, wherein in the recumbent position the first foot rest is raised at its forward end such that the foot rest face of the first foot rest is at an acute angle between 10 ° and 23 ° open forward from horizontal.

23. A seating unit as claimed in claim 22, wherein in the recumbent position the first foot rest is raised at its forward end such that the foot rest face of the first foot rest is at an acute angle between 16 ° and 19 ° open forward from horizontal.

24. The seating unit defined in claim 19, wherein the leg extension device further includes a second foot rest, the first foot rest and the second foot rest each being stowed below the seat in the seated position; in the TV pose position, the first foot rest and the second foot rest extend forward; in the recumbent position, the backrest is reclined with the highest point of the footstool being higher than the highest point of the backrest, wherein both the first foot rest and the second foot rest extend forward and upward, wherein the second foot rest is located in front of the first foot rest.

25. A seating unit as claimed in claim 24, wherein in the recumbent position the second footrest is raised at its forward end such that the foot rest face of the second footrest is at an acute angle between 10 ° and 23 ° open forward from horizontal.

26. A seating unit as claimed in claim 25, wherein in the recumbent position the second footrest is raised at its forward end such that the foot rest face of the second footrest is at an acute angle between 12 ° and 15 ° open forward from horizontal.

27. A seating unit as claimed in claim 24, wherein in the recumbent position the second foot rest depends at a forward end thereof such that the foot rest face of the second foot rest is at an acute angle between 8 ° and 30 ° open rearward from horizontal.

28. The seating unit defined in claim 27, wherein in the recumbent position, the foot rest surface of the second foot rest is at an angle of between 12 ° and 20 ° from horizontal.

29. The seating unit defined in claim 24, wherein the first leg rest and the second leg rest are connected by a leg rest extension assembly including first and second extensions hinged to one another.

30. The seating unit of claim 19, wherein the back link assembly further comprises a third back link, a fourth back link, and a fifth back link, wherein a lower end of the third back link is hinged to the second back link, an upper end of the third back link is hinged to a rear end of the back link, an upper end of the fourth back link is hinged to a front end of the back link at a first pivot point, a front end of the fifth back link is hinged to the first back link at a second pivot point, a rear end of the fifth back link is hinged to a middle of the third back link, and a lower end of the fourth back link is hinged to a middle of the fifth back link.

31. The seating unit defined in claim 30, wherein compression of the back link assembly reclines the back link during shifting of the seating unit from the seating position to the lie position.

32. The seating unit of claim 31, wherein relative movement between the side plates and the center linkage increases a distance between a hinge point of the first back link and center linkage and a hinge point of the second back link and side plates during a transition of the seating unit from a seating position to a reclined position, thereby effecting compression of the back link assembly.

33. The seating unit of claim 30, wherein the first pivot point and the second pivot point both move forward during the transition of the seating unit from the seating position to the lie position, wherein a distance between the first pivot point and the second pivot point decreases.

34. The seating unit of claim 19, wherein the seat assembly further comprises a front swing link, a rear swing link, a seat linkage, and a side plate linkage, wherein lower ends of the front swing link and the rear swing link are pivotally connected to the base assembly, respectively, and upper ends of the front swing link and the rear swing link are connected to the side plate via a center linkage, a seat linkage, and a side plate linkage.

35. The seating unit defined in claim 34, wherein movement of the back assembly and leg extension means relative to the seat assembly is caused by swinging of the side panels relative to the base assembly to effect the transition of the seating unit between the seating and lie positions.

36. The seating unit defined in claim 19, further comprising an electric drive coupled between the base assembly and the side panels.