CN117461955A - Mechanical stretching device for a movable seat unit and seat unit - Google Patents

Abstract

The invention relates to a mechanical stretching device for a movable seating unit, comprising: -a linkage support (1) comprising a support structure (12), a linkage structure (13) and a seat frame mounting plate (135), the linkage structure (13) having side plates (131); -a back mechanism (2), the back mechanism (2) being pivotably connected with the linkage mount (1) and for attachment with a backrest of the seating unit; -a leg extension (3) with a foot rest, the leg extension (3) being pivotably connected with the linkage support (1) and the foot rest being attached with a footrest of the seat unit. According to the invention, the seat frame mounting plate (135) and the linkage structure (13) are hinged in a relatively pivotable manner at a first hinge point (137), so that a first included angle (alpha) is formed by taking the extending direction of the side plate (131) and the seat frame mounting plate (135) as a side, and the seat frame mounting plate (135) and the linkage structure (13) are pivoted in a relatively pivotable manner through the pivot mechanism and cause the change of the first included angle (alpha) in the back tilting process for realizing the conversion of the seat unit to the lying state.

Description

Mechanical stretching device for a movable seat unit and seat unit

Technical Field

The present invention 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 they can be converted between a sitting, a resting (or TV) position and a lying position, the footrests of the seating units extending forward with the angle between the backrest and the seat part being substantially unchanged when said seating units are converted from the sitting to the resting position, the footrests being raised further forward and upwards than in the resting position, the backrest being raised significantly backward, so 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 of the known designs is that with the change of the seating unit into the lying position, the seat part is tilted up too strongly, so that the seat part forms an excessive angle with the horizontal plane, which affects the comfort of the user. In addition, the seat part is raised severely to cause a larger gap between the seat part and the backrest, so that the risk of dropping articles is brought, and the potential safety hazard of easily clamping a user is caused.

Disclosure of Invention

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

To solve the above-mentioned technical problem, the present invention provides a mechanical stretching device for a movable seat unit, which comprises left and right mirror-symmetrical halves, only one of which is described below.

The mechanical stretching device for a movable seating unit according to the present invention comprises:

-a linkage mount comprising a support structure for movably supporting the mechanical stretcher, a linkage structure movably connected with the seat portion of the seat unit, and a seat frame mounting plate for attaching the seat portion, the linkage structure comprising side plates;

-a back mechanism pivotably connected to the linkage mount and for attachment to a backrest of the seating unit;

-a leg extension with a foot rest, the leg extension being pivotably connected with a linkage mount and the foot rest being attached with a footrest of a seat unit.

The mechanical stretching device according to the present invention is configured to enable the seat unit to be shifted between two or three of a sitting posture state, a leisure posture state and a lying posture state. In other words, the seat unit is capable of sequential conversion or reverse sequential conversion between a sitting posture state, a leisure posture state and a lying posture state; the seating unit is also capable of direct conversion from a sitting position to a lying position or vice versa. In the sitting position, the footrests are folded under the seat; in the rest position, the footrests extend to the front of the seat portion; in said recumbent position the backrest reclines such that the angle between the backrest and the seat portion increases relative to the sitting position and in said recumbent position the footrests extend forward of the seat portion and the footrests preferably extend further forward and upward than in said recumbent position, more preferably such that the height of the highest point of the leg extension structure relative to the horizontal plane is greater than the height of the highest point of the back mechanism relative to the horizontal plane, thereby forming a so-called "zero gravity" position in which the legs of the seat unit user are significantly above the head, at least above the chest.

According to the invention, the seat frame mounting plate and the linkage structure are relatively pivotally hinged at a first hinge point, so that a first included angle which takes the extending direction of the side plate and the seat frame mounting plate as an edge is formed. In the process that the backrest of the seat unit is reclined for realizing the transformation from the seat unit to the lying state, the seat frame mounting plate and the linkage structure are pivoted relatively through the pivoting mechanism and cause the change of the first included angle.

In a preferred embodiment, the seat frame mounting plate is pivotally hinged relative to the side plate of the linkage structure at a first hinge point, thereby forming a first angle with the first hinge point as an apex and with the direction of extension of the side plate and the seat frame mounting plate as an edge. In the process of leaning back, the seat frame mounting plate and the side plate are pivoted relatively around a first hinge point through a pivot mechanism, and the first included angle is changed.

Alternatively, the bezel mounting plate may also be hinged to the side plate indirectly, for example by means of other connectors, such as one or more pivot members.

According to the invention, the first angle varies from 0 ° to 15 °, preferably from 2 ° to 8 °, most preferably from 4 ° to 6 °, during recline of the backrest.

According to the present invention, preferably, when the first hinge point is provided at the front end of the seat frame mounting plate, the first clip angle becomes large during the reclining of the backrest; and when the first hinge point is arranged at the rear end of the seat frame mounting plate, the first included angle becomes smaller in the backward tilting process of the backrest.

In this embodiment, during recline of the backrest, the front ends of the side plates of the linkage move upwardly and forwardly, so that the first hinge point between the seat frame mounting plate and the side plates also moves upwardly and forwardly therewith. Meanwhile, when the first hinge point is provided at the front end, the rear end of the seat frame mounting plate is raised as a free end, which makes the first clip angle large; and when the first hinge point is provided at the rear end, the front end of the seat frame mounting plate descends as a free end, which makes the first angle smaller.

Compared with the design of the fixed assembly of the seat part and the side plate, the upward inclination degree of the seat frame mounting plate in the back leaning process is obviously reduced. On the one hand, the user can take a more stretched posture in a lying posture state, so that the use comfort is improved, on the other hand, the gap between the seat part and the backrest caused by the severe upward tilting of the seat part is eliminated, the use convenience is improved, and the use safety is improved.

According to the present invention, the seat frame mounting plate is configured with a support flange, and the seat portion can be mounted on the support flange.

According to an alternative embodiment of the invention, the seat frame mounting plate remains stationary relative to the backrest during the transition of the seat unit from the sitting position to the rest position. In this embodiment, the support flange can be supported with its bottom side on the side plate. Preferably, in the design that the first hinge point is provided at the front end of the seat frame mounting plate, the support flange can be supported on the side plate with its bottom side at the rear of the seat frame mounting plate, more preferably on the corresponding boss of the side plate, so that the seat frame mounting part is always supported on the side plate during the transition of the seat unit from the sitting posture to the leisure posture, and the user can always maintain a more stretched posture, resulting in better comfort.

According to the invention, the linkage structure comprises the lifting component, and when the first hinge point is arranged at the front end of the seat frame mounting plate, the lifting component promotes the rear end of the seat part to lift upwards in the process of leaning back. Optionally, when the first hinge point is disposed at the rear end of the seat frame mounting plate, the lifting assembly urges the front end of the seat portion downward.

According to the invention, the pivoting mechanism is designed as a seat frame pivot lever, wherein the seat frame mounting plate is hinged at its rear end to one end of the seat frame pivot lever at a second hinge point when the first hinge point is provided at the front end of the seat frame mounting plate, wherein the other end of the seat frame pivot lever is hinged to the linkage, preferably to the lifting assembly.

Preferably, according to the present invention, the support structure comprises a base and a first support member and a second support member pivotally connected to the base, respectively, and the lifting assembly is disposed between the first support member and the second support member.

Preferably, according to the present invention, the lifting assembly includes a lifting linkage pivotably connected to the seat frame pivot lever. When the first hinge point is arranged at the front end of the seat frame mounting plate, the lifting linkage piece pivots in the back leaning process, so that a second hinge point between the seat frame pivot rod and the seat frame mounting plate rises, and the rear end of the seat frame mounting plate is lifted upwards. In this design, the other end of the seat frame pivot lever is pivotally connected to the lift linkage. Therefore, the seat frame mounting plate, the seat frame pivoting rod, the lifting linkage piece and the side plate form a four-bar mechanism. Therefore, in the process of leaning back, when the lifting assembly of the linkage structure, preferably the lifting linkage piece, is driven by the side plates to pivotally move, the second hinge point between the seat frame pivot rod and the seat frame mounting plate is pushed to move upwards, and then the rear end of the seat frame mounting plate pivotally connected with the seat frame pivot rod is enabled to rise. When the first hinge point is arranged at the rear end of the seat frame mounting plate, the position of the hinge point between the seat frame pivot rod and the lifting linkage piece on the lifting connecting piece is adjusted, so that the second hinge point between the seat frame pivot rod and the lifting linkage piece moves forwards and downwards in the process of leaning back the backrest of the seat unit, and the front end of the seat frame mounting plate is forced to be lowered downwards through the seat frame pivot rod.

According to the invention, the lifting assembly further comprises a first lifting link and a second lifting link. In this embodiment, the lifting linkage is preferably pivotably coupled to the support structure, the first lifting link, the back mechanism and the linkage, respectively.

According to the invention, the lifting linkage is provided with a support connection point, a transmission connection point, a back connection point and preferably also with a linkage connection point. The support connection point is pivotably coupled to a support structure, preferably a second support of the support structure; the transmission connection point is pivotally coupled with the first lifting connecting rod; the back connection point is pivotally coupled to the back mechanism. Preferably, the linkage connection point is pivotably coupled to a linkage structure, preferably a side plate of the linkage structure.

In this embodiment, preferably, a first distance L1 is provided between the drive connection point and the support connection point, a second distance L2 is provided between the drive connection point and the back connection point, and the ratio of the first distance L1 to the second distance L2 is in the range of 0.95 to 0.75.

The seat part, preferably the support flange of the seat frame mounting plate, forms a second included angle with the horizontal direction. The second clip angle becomes larger during recline of the back of the seat unit. Preferably, the second angle is between 10 ° and 18 °, preferably between 14 ° and 16 °, in the fully reclined state of the backrest, i.e. in the recumbent state, in which the highest point of the leg extension is 400mm to 600mm, preferably 554mm, relative to the ground.

Compared with the design mode of fixing and assembling the seat part and the side plates, the seat unit realizes smaller inclination of the seat part under the condition that the heights of the legs are the same in the lying state, thereby improving the using comfort.

According to the invention, the linkage structure further comprises a first linkage piece, a second linkage piece and a third linkage piece, wherein the middle part of the second linkage piece is rotationally connected with the side plate, one end of the second linkage piece is connected with one end of the first linkage piece, the other end of the first linkage piece is connected with the first support piece, the other end of the second linkage piece is connected with one end of the third linkage piece, and the other end of the third linkage piece is connected with the leg rest extending mechanism.

The mechanical stretching device according to the present invention further comprises a leg stretching structure comprising a first leg link, a second leg link, a third leg link, a fourth leg link, and a foot rest, wherein the rear end of the first leg link is hinged to the linkage structure, the front end of the first leg link is hinged to the rear end of the second leg link, the rear end of the third leg link is hinged to the linkage structure, the front end of the third leg link is hinged to the rear end of the fourth leg link, the second leg link and the fourth leg link are respectively hinged to the foot rest at the front ends thereof, wherein the middle part of the second leg link is further hinged to the middle part of the third leg link, preferably, one end of the second leg link close to the first leg link is provided with a first connection point, and the second leg link is hinged to the middle part of the third leg link at the first connection point.

In a further aspect, the invention also relates to a seating unit comprising the above-described mechanical stretching device, an armrest attached to the mechanical stretching device, a seat portion, a backrest, a footrest, preferably comprising an electric drive.

The seat unit may preferably be designed as a cradle floor type seat unit, in which case the support structure of the mechanical stretcher is movably supported on the floor.

The seating unit may also be configured as a floor-standing armrest seating unit, in which case the support structure of the mechanical extension device is movably attached to the armrest, the underside of which rests on the floor.

Drawings

Embodiments of the present invention 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 invention in a recumbent position;

FIG. 2 is a side view of the mechanical stretcher of FIG. 1 in a seated position;

FIG. 3 is a side view of the mechanical stretcher of FIG. 1 in a resting position;

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

FIG. 5 is another angled side view of the mechanical stretcher of FIG. 2;

FIG. 6 is another angled side view of the mechanical stretcher of FIG. 3;

FIG. 7 is another angled side view of the mechanical stretcher of FIG. 4;

FIG. 8 is a side view of a mechanical stretcher according to another embodiment of the present invention in a resting position;

FIG. 9 is a side view of the mechanical stretcher of FIG. 8 in a recumbent position;

FIG. 10 is a perspective view of a seating unit in accordance with an embodiment of the present invention;

FIGS. 11a, 11b are side views of the seating unit of FIG. 10 in a seated position;

FIGS. 12a, 12b are side views of the seating unit of FIG. 10 in a recreational attitude;

FIGS. 13a, 13b are side views of the seating unit of FIG. 10 in a reclined position;

FIG. 14 is a perspective view of a seating unit in accordance with another embodiment of the present invention;

fig. 15 is a side view of the seating unit of fig. 14 in a seated position.

Detailed Description

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

Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. In the description of the present invention, 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 invention 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 invention. 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 embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The invention is first illustrated by way of example in the case of the floor-standing mechanical extension of the iron stand shown in fig. 1 to 7, wherein the seat mounting plate 135 is articulated with its front end to the front end of the side plate 131.

One embodiment of a mechanical stretching device for a movable seating unit is schematically shown in fig. 1. The mechanical stretching device comprises: a linkage support 1, a back mechanism 2 and a leg extension structure 3.

Specifically, as shown in fig. 3, the linkage support 1 includes a support structure 12, a linkage structure 13, and a seat frame mounting plate 135.

The mechanical stretching device shown in fig. 1 to 7 is implemented as a cradle-type mechanical stretching device, in which embodiment the support structure 12 comprises a base 121, a first support 122 and a second support 123. The base 121 includes two mirror-symmetrical side rails 1211 disposed on the left and right sides, and preferably also includes a front rail 1212 and a rear rail 1213 that connect the two side rails 1211. The first support 122 is hinged with its lower end to the front end of the side rail 1211, and the second support 123 is hinged with its lower end to the rear end of the side rail 1211.

The linkage structure 13 includes a side plate 131, a first linkage 132, a second linkage 133, a third linkage 134, a bezel pivot lever 136, and a lift assembly 124. The middle part of the second linkage member 133 is rotatably connected with the side plate 131, one end of the second linkage member 133 is connected with one end of the first linkage member 132, the other end of the first linkage member 132 is connected with the first support member 122, the other end of the second linkage member 133 is connected with one end of the third linkage member 134, and the other end of the third linkage member 134 is pivotally connected with the leg extension structure 3. In the embodiment shown in fig. 1 to 7, the seat frame mounting plate 135 is hinged at its front end to the front end of the side plate 131 at a first hinge point 137, and the opposite free end of the seat mounting plate 135 is hinged to one end of the seat frame pivot lever 136 at a second hinge point 138, wherein the other end of the seat frame pivot lever 136 is hinged to the linkage 13, in particular to a lifting linkage 1241 in the lifting assembly 124 of the linkage 13.

As shown in fig. 5 to 7, the elevation assembly 124 includes: lift linkage 1241, first lift link 1242, and second lift link 1243. The elevating assembly 124 is disposed between the first support 122 and the second support 123.

As shown in fig. 5, the lifting linkage 1241 is provided with a support connection point 1241a, a transmission connection point 1241b, a back connection point 1241c and a linkage connection point 1241d, wherein the support connection point 1241a is pivotally coupled with the second support 123 of the support structure 12, the transmission connection point 1241b is pivotally coupled with one end of the first lifting link 1242, and the other end of the first lifting link 1242 is pivotally connected with the first support 122 through the second lifting link 1243; the back connection point 1241c is pivotally coupled to the back link 22 of the back mechanism 2 and the linkage connection point 1241d is pivotally coupled to the side plate 131 of the linkage structure 13.

As shown in fig. 7, in this embodiment, a first distance L1 is between the transmission connection point 1241b and the support connection point 1241a, a second distance L2 is between the transmission connection point 1241b and the back connection point 1241c, and a ratio of the first distance L1 to the second distance L2 ranges from 0.95 to 0.75.

A support flange 1351 is formed on the seat frame mounting plate 135, and is preferably configured integrally with the seat frame mounting plate 135.

Specifically, the back mechanism 2 includes a back link 21 attached to the back and a back link 22 pivotally connected thereto. The backrest connecting member 21 is hinged to the rear end of the side plate 131 of the linkage 13.

Specifically, the leg extension structure 3 is composed of 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 131 of the linkage structure 13, 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 131, the front end of the third leg link 33 is hinged to the rear end of the fourth leg link 34, the second leg link 32 and the fourth leg link 34 are respectively hinged to the leg rest 35 at the front ends thereof, wherein a first connection point 321 is provided at an end of the second leg link 32 near the first leg link 31, and the second leg link 32 is hinged to the middle of the third leg link 33 at the first connection point 321.

Specifically, the linkage support 1 further includes a transmission structure 14, and the transmission structure 14 includes a first transmission member 141 and a second transmission member 142 that are connected. The first transmission member 141 is hinged at one end to the second transmission member 142 and at the other end is connected directly or indirectly to a drive means, preferably an electric drive means. Preferably, as shown in fig. 1, one end of the first transmission member 141 is hinged with one end of the second transmission member 141, the other end of the first transmission member 141 is attached to the side plate 131 and connected with the electric driving device 8 via a pivot link, and the other end of the second transmission member 142 is connected with the first leg link 31 of the leg extension structure 3. The driving device is used for driving the linkage support to move through the transmission structure. In some embodiments, the electric drive may be a push rod motor or a slider motor drive, preferably a linear motor; in other embodiments, the drive may be a manual drive.

According to the present embodiment, the back mechanism 2 and the leg stretching device 3 are driven to stretch or shrink by the movement of the linking bracket 1, so that the mechanical stretching device can realize the conversion of the seat unit between the sitting posture state shown in fig. 2 and 5, the leisure posture state shown in fig. 3 and 6 and the lying posture state shown in fig. 4 and 7, or the direct conversion between the sitting posture state and the lying posture state.

In the embodiment shown in fig. 1 to 7, a mechanical stretching device capable of changing between three postures of sitting, resting and lying is exemplified. In the sitting position, the footrests 35 are folded under the seat; in the rest position, the foot rest 35 extends to the front of the seat portion; in the recumbent position, the backrest is reclined such that the angle between the backrest and the seat portion increases relative to in the sitting position and in the rest position, the footrests 35 extend further forward and upward than in the rest position.

In the process of the seat unit moving from the sitting posture state shown in fig. 2 and 5 to the leisure posture state shown in fig. 3 and 6, the linkage structure 13 drives the first supporting member 122 to incline forward, and further drives the lifting assembly 124 to move forward. In the process, the seat frame mounting plate 135 is supported with its bottom side of the support flange 1351 on the side plate 131, so that the seat part remains stationary with respect to the side plate 131 throughout the process.

During the transition of the seat unit from the rest posture state shown in fig. 3 and 6 to the lying posture state shown in fig. 4 and 7, the front end of the side plate 131 moves upward and forward, so that the first hinge point 137 between the seat frame mounting plate 135 and the side plate 131 moves upward and forward accordingly, which causes the front end of the seat frame mounting plate 135 to move forward and tilt up. Meanwhile, the elevation linkage 1241 of the elevation assembly 124 pivots about the hinge point with the second support 123, and as shown in fig. 6 and 7, the elevation linkage 1241 pivots about the hinge point with the second support 123 in a counterclockwise direction during the transition of the seat unit to the lying state, so that the second hinge point 138 between the seat frame pivot lever 136 and the elevation linkage 1241 moves upward, thereby causing the seat frame pivot lever 136 to push the rear end of the seat frame mounting plate 135 upward. Thereby making the magnitude of the tilting of the bezel mounting plate 135 less large.

As shown in fig. 3 and 4, the seat frame mounting plate 135 is pivotally hinged at a first hinge point 137 between the front end thereof and the front end of the side plate 131, thereby forming a first angle α with respect to the extending direction of the side plate 131 and the seat frame mounting plate 135, which is viewed from the side of the mechanical stretching device and has the first hinge point 137 as a vertex. The first angle α becomes larger during the transition of the seat unit from the rest position shown in fig. 3 to the lying position shown in fig. 4, and in this embodiment, the first angle α increases by 0 ° to 15 °, preferably by 2 ° to 8 °, and most preferably by 4 ° to 6 °.

Fig. 8 and 9 show another floor-standing mechanical stretcher of the iron stand. The embodiment shown in fig. 8 and 9 is substantially the same as the embodiment shown in fig. 1 to 7, except that in the embodiment shown in fig. 8 and 9, the seat mounting plate 135 is hinged at its rear end to the rear end of the side plate 131.

In this embodiment, the seat mounting plate 135 is hinged at a first hinge point 137 at its rear end with the rear end of the side plate 131, and the opposite free end of the seat mounting plate 135 is hinged at a second hinge point 138 with one end of the seat frame pivot lever 136, wherein the other end of the seat frame pivot lever 136 is hinged with the linkage 13, in particular with a lift linkage 1241 in the lift assembly 124 of the linkage 13.

By adjusting the position of the hinge point between the seat frame pivot lever 136 and the lift linkage 1241 on the lift link 1241, the second hinge point 138 between the seat frame pivot lever 136 and the lift linkage 1241 moves forward and downward during recline of the back of the seat unit, thereby forcing the front end of the seat frame mounting plate 135 to descend through the seat frame pivot lever 136. Thereby making the magnitude of the tilting of the bezel mounting plate 135 less large.

As shown in fig. 8 and 9, the seat frame mounting plate 135 is relatively pivotally hinged at a first hinge point 137 between a rear end thereof and a rear end of the side plate 131, thereby forming a first angle α with respect to an extending direction of the side plate 131 and the seat frame mounting plate 135, which is an apex of the first hinge point 137. The first angle α becomes smaller during the transition of the seat unit from the rest position shown in fig. 8 to the lying position shown in fig. 9, and in this embodiment, the first angle α is reduced by 0 ° to 15 °, preferably by 2 ° to 8 °, and most preferably by 4 ° to 6 °.

Fig. 10 to 13b exemplarily show a iron stand floor type seat unit according to the present invention.

As shown in fig. 10, the illustrated seating unit includes a mechanical stretching device according to the present invention, an armrest 4 attached to the mechanical stretching device, a seat frame 5 for attaching a seat portion, a backrest 6, a footrest 7, and an electric drive device. In this embodiment, the mechanical stretcher is movably supported on the ground by a base 121 of the support structure 12.

Fig. 11a, 11b show the seating unit in a sitting position, in which the backrest 6 remains substantially vertical and the footrests 7 attached to the footrests are folded under the seating portion.

Fig. 12a, 12b show the seating unit in a rest position, in which the leg extension means has moved the footrest 7 forward and upward, the seat frame 5 being substantially stationary relative to the backrest 6.

Fig. 13a, 13b show the seating unit in a lying position, in which the backrest 6 is reclined and the front end of the seat frame 5 is tilted upward, however its angle of tilt is significantly reduced compared to the prior art.

One side of the armrest is removed in fig. 11b, 12b and 13b for clarity.

The seating unit according to the present invention can be converted between the sitting, resting and lying positions shown in fig. 11a to 13b, and can also be converted directly from the sitting position shown in fig. 11a, 11b to the lying position shown in fig. 13a, 13b or vice versa.

Fig. 14 and 15 exemplarily show a armrest floor type seating unit according to the present invention.

The footrests which are folded under the seat in the sitting position are removed for clarity. As shown in fig. 14, the illustrated seating unit includes a mechanical stretching device according to the present invention, an armrest 4 attached to the mechanical stretching device, a seat frame 5 for attaching a seat portion, a backrest 6, an electric drive device, and a not-shown footrest. In this embodiment, the armrests 4 are each fixedly connected to the base of the support structure 12, and the bottom surfaces of the armrests 4 are also supported on the ground.

Fig. 15 shows a side view of the seating unit in a sitting position, with one side armrest removed for clarity.

As shown in fig. 12b and 13b, the support flange 1351 for supporting the seat portion 5 forms a second angle β with the horizontal direction when viewed from the side of the mechanical stretcher or the seat unit. The second angle beta becomes larger during the transition of the seat unit from the rest position to the lying position, wherein preferably the second angle beta is an angle between 10 deg. and 18 deg., preferably between 14 deg. and 16 deg. in the lying position. In this state, the highest point of the leg extension 3 has a height of 400mm to 600mm, preferably 554mm, with respect to the ground.

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

List of reference numerals

1. Linkage support

12. Supporting structure

121. Base seat

1211. Side rail

1212. Front transverse rail

1213. Rear cross rail

122. First support piece

123. Second support piece

124. Lifting assembly

1241. Lifting linkage piece

1241a support connection point

1241b drive connection point

1241c back attachment point

1241d linkage connection point

1242. First lifting connecting rod

1243. Second lifting connecting rod

13. Linkage structure

131. Side plate

132. First linkage member

133. Second linkage member

134. Third linkage member

135. Seat frame mounting plate

1351. Support flange

136. Seat frame pivot rod

137. First hinge point

138. Second hinge point

14. Transmission structure

141. First transmission member

142. Second transmission member

2. Back mechanism

21. Backrest connecting piece

22. Back connecting rod

3. Leg stretching device

31. First leg connecting rod

32. Second leg link

321. First connection point

33. Third leg connecting rod

34. Fourth leg link

4. Armrest (Armrest)

5. Seat frame

6. Backrest for chair

7. Foot stool

8. Electric drive device

Alpha first included angle

Beta second included angle

L1 first distance

L2 a second distance.

Claims (13)

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

-a linkage support (1) comprising a support structure (12) for movably supporting the mechanical stretcher, a linkage structure (13) movably connected with the seat portion of the seat unit, and a seat frame mounting plate (135) for attaching the seat portion, the linkage structure (13) having side plates (131);

-a back mechanism (2), the back mechanism (2) being pivotably connected with the linkage mount (1) and for attachment with a backrest of the seating unit;

-a leg extension (3) with a foot rest, the leg extension (3) being pivotably connected with the linkage mount (1) and the foot rest being attached with a footrest of the seat unit;

the seat frame mounting plate (135) and the linkage structure (13), preferably the side plate (131), are hinged in a relatively pivotable manner at a first hinge point (137), so that a first included angle (alpha) which preferably takes the first hinge point (137) as a vertex and takes the extending direction of the side plate (131) and the seat frame mounting plate (135) as a side is formed, and in the reclining process of the backrest for realizing the conversion of the seat unit into the reclining position, the seat frame mounting plate (135) and the linkage structure (13), preferably the side plate (131), are pivoted relatively around the first hinge point (137) through the pivot mechanism, and the first included angle (alpha) is changed.

2. A mechanical stretching device according to claim 1, wherein the first angle (α) varies by 0 ° to 15 °, preferably by 2 ° to 8 °, most preferably by 4 ° to 6 °, during recline of the backrest.

3. The mechanical stretching device according to claim 1 or 2, wherein the first angle (a) becomes larger during recline of the backrest when the first hinge point (137) is provided at the front end of the seat frame mounting plate (135); and when the first hinge point (137) is disposed at the rear end of the seat frame mounting plate (135), the first angle (α) becomes smaller during the reclining of the backrest.

4. A mechanical stretching device according to claim 3, wherein the linkage (13) comprises a lifting assembly (124), the lifting assembly (124) causing the rear end of the seat portion to lift upwards during recline of the backrest when the first hinge point (137) is provided at the front end of the seat mounting plate (135); when the first hinge point (137) is disposed at the rear end of the seat frame mounting plate (135), the lifting assembly (124) urges the front end of the seat portion to be lowered downward during recline of the backrest.

5. The mechanical stretching device according to claim 4, wherein the pivoting mechanism is designed as a seat frame pivoting lever (136), wherein the seat frame mounting plate (135) is hinged at its rear end with one end of the seat frame pivoting lever (136) at a second hinge point (138) when the first hinge point (137) is provided at the front end of the seat frame mounting plate (135), wherein the other end of the seat frame pivoting lever (136) is hinged with the linkage (13), preferably with the lifting assembly (124).

6. The mechanical stretcher according to claim 5 wherein the lift assembly (124) includes a lift linkage (1241), the lift linkage (1241) being pivotally connected to the seat frame pivot lever (136), the lift linkage (1241) pivoting during recline of the backrest when the first hinge point (137) is disposed at the forward end of the seat frame mounting plate (135) such that a second hinge point (138) between the seat frame pivot lever (136) and the seat frame mounting plate (135) rises to raise the rear end of the seat frame mounting plate (135) upward; when the first hinge point (137) is disposed at the rear end of the seat frame mounting plate (135), the elevation linkage (1241) pivots during recline of the backrest, so that the second hinge point (138) between the seat frame pivot lever (136) and the seat frame mounting plate (135) descends, thereby lowering the front end of the seat frame mounting plate (135) downward.

7. The mechanical stretching device according to claim 6, wherein the lifting assembly (124) further comprises a first lifting link (1242) and a second lifting link (1243), wherein preferably the lifting linkage (1241) is pivotably coupled to the support structure (12), the first lifting link (1242), the back mechanism (2), the linkage structure (13), respectively.

8. Mechanical stretching device according to claim 7, wherein the lifting linkage (1241) is provided with a support connection point (1241 a), a transmission connection point (1241 b), a back connection point (1241 c) and preferably a linkage connection point (1241 d), wherein the support connection point (1241 a) is pivotably coupled to a support structure (12), preferably a second support (123) of the support structure (12), the transmission connection point (1241 b) is pivotably coupled to a first lifting link (1242), the back connection point (1241 c) is pivotably coupled to a back mechanism (2), preferably the linkage connection point (1241 d) is pivotably coupled to a linkage structure (13), preferably a side plate (131) of the linkage structure (13), and wherein preferably the transmission connection point (1241 b) has a first distance (L1) from the support connection point (1241 a), the transmission connection point (1241 b) has a second distance (L2) from the back connection point (1241 c), the first distance (L2) being in the range of a second distance (L0.75.

9. A mechanical stretching device according to any one of the preceding claims, wherein the seat portion forms a second angle (β) with the horizontal direction, wherein the second angle (β) becomes larger during recline of the backrest.

10. A mechanical stretching device according to claim 9, wherein the second included angle (β) is an angle between 10 ° and 18 °, preferably between 14 ° and 16 °, and the highest point of the leg stretching structure (3) is 400mm to 600mm, preferably 554mm, with respect to the ground in the fully reclined state of the backrest.

11. A movable seating unit, the seating unit comprising: a mechanical stretching device, a handrail attached thereto, a seat portion, a backrest, a footrest according to any one of the preceding claims, preferably comprising an electric drive.

12. A seating unit as claimed in claim 11, characterised in that the mechanical stretching means is movably supported on the ground by a support structure (12).

13. A seating unit as claimed in claim 11, wherein the support structure (12) of the mechanical stretcher is movably attached to an armrest, the underside of which is supported on the ground.