Mechanical extension device for a movable seat and movable seat

Abstract

The utility model provides a mechanical stretching device for a movable seat and the movable seat. The mechanical stretching device comprises a base fixedly supported on the ground; the bearing frame, the seat mounting plate, the backrest support and the leg assembly are movably arranged above the base, and the leg assembly comprises a pedal mounting plate and an eversion assembly; the lifting assembly is arranged between the base and the bearing frame, and the seat mounting plate can be switched between the sitting position and the lifting position through the lifting assembly. According to the chair, the mechanical stretching device can be at least switched between the sitting posture position and the lying posture position through the linkage mechanism, in the lying posture position, the foremost end of the eversion assembly is located in front of the pedal mounting plate, the backrest support inclines backwards relative to the seat mounting plate, and the backrest support is located at the front end of the eversion assembly. The foremost end of the eversion assembly is higher than the foremost end of the backrest bracket.

Description

Technical Field

[0001] The utility model relates to a mechanical extension device for a movable seat and the movable seat comprising the mechanical extension device. Background Art

[0002] With the improvement of living standards and people's increasingly sophisticated demands for household items, the functions of movable seats are becoming more and more diverse. For example, in addition to the common sitting position and lying position, the "elderly chair" also has a so-called "lifting position". In the lifting position, the seat of the elderly chair can be raised relative to the ground and tilted forward to assist the user to stand up. However, with the diversification of functions, the structure has also become more complicated. This will lead to an increase in the number of parts required on the one hand, and an increase in the overall volume of the seat on the other hand. Utility Model Content

[0003] In view of this, the technical problem to be solved by the present invention is how to provide a seat that maintains a good user experience and comprehensive functionality while having a compact structure.

[0004] In order to solve the technical problem, a mechanical extension device for a movable seat is provided, the mechanical extension device comprising:

[0005] - A base fixed to the ground;

[0006] - a load-bearing frame, a seat mounting plate, a backrest support and a leg assembly movably arranged above the base, wherein the leg assembly includes a footrest mounting plate and an outward turning assembly; and

[0007] - A lifting assembly arranged between the base and the supporting frame, wherein a seat mounting plate is pivotally connected to the supporting frame, by means of which the supporting frame together with the seat mounting plate can be transformed between a sitting position and a raised position.

[0008] According to the utility model, the mechanical extension device can be transformed at least between a sitting position and a lying position, in which the front end of the outward-turned component is located in front of the footrest mounting plate, and the backrest bracket is tilted backward relative to the seat mounting plate, wherein the front end of the outward-turned component is higher than the front end of the backrest bracket.

[0009] Preferably, in the lying position, the height of the most front end of the eversion assembly relative to the ground is at least 490 mm. Preferably, in the lying position, the height of the most front end of the eversion assembly relative to the ground is at least 550 mm.

[0010] In the sitting position, the backrest bracket together with the backrest attached thereto generally points upward, the leg assembly is folded, and the footrest attached to the leg assembly is folded under the seat portion; in the lying position, the backrest bracket together with the backrest attached thereto is obviously tilted backward compared to the lying position, the leg assembly is extended forward and upward, and the footrest attached to the leg assembly is lifted forward and upward. In the process of changing from the sitting position to the lying position, the eversion assembly of the leg assembly is unfolded, so that the front end of the eversion assembly is located in front of the footrest mounting plate, thereby extending the support part for the user's lower limbs, especially at least the foot and / or calf part, providing a better zero-gravity use experience. At the same time, since the eversion assembly itself is only unfolded during the change from the sitting position to the lying position, and remains folded in the sitting position, a more compact structure is provided.

[0011] In a preferred embodiment, the outward-turning assembly includes a first outward-turning link, a second outward-turning link, a third outward-turning link and an outward-turning drive rod, wherein a four-bar linkage is formed by the footrest mounting plate, the first outward-turning link, the second outward-turning link and the third outward-turning link, and wherein the four-bar linkage can be driven to deform by the outward-turning drive rod, so that the front end of the outward-turning assembly is located in front of the footrest mounting plate.

[0012] In a preferred embodiment, the leg assembly also includes a first leg link, a second leg link, a third leg link and a fourth leg link, wherein the front ends of the third leg link and the fourth leg link are respectively hinged to the footrest mounting plate, wherein the front end of the outward-turning drive rod is hinged to the four-bar linkage, and the rear end of the outward-turning drive rod is hinged to the fourth leg link at a first hinge point.

[0013] In a preferred embodiment, the first outward-turning link includes a second hinge point arranged on its first free end, a fourth hinge point arranged on its second free end, and a third hinge point located between the second hinge point and the fourth hinge point, wherein the first outward-turning link is hinged to the outward-turning drive rod at the second hinge point, is hinged to the footrest mounting plate at the third hinge point, and is hinged to the third outward-turning link at the fourth hinge point.

[0014] In a preferred embodiment, during the unfolding of the leg assembly, as the angle between the fourth leg link and the footrest mounting plate increases, the outward drive rod causes the second free end of the first outward link to pivot upward around the third hinge point.

[0015] In a preferred embodiment, the first outward-turned connecting rod is configured as a crank member, wherein a line connecting the second hinge point and the fourth hinge point is located in front of the third hinge point.

[0016] In a preferred embodiment, two ends of the second outward-turned connecting rod are respectively hinged to the front end of the footrest mounting plate and the third outward-turned connecting rod.

[0017] In a preferred embodiment, in the lying position, the angle of the front side of the backrest bracket to the horizontal plane is at most 22°. Preferably, in the lying position, the angle of the front side of the backrest bracket to the horizontal plane is at most 13°.

[0018] In a preferred embodiment, in the sitting position, the leg assembly is retracted relative to the seat mounting plate.

[0019] In a preferred embodiment, in the raised position, the seat mounting plate is raised and tilted forward relative to the base, and the leg assembly is folded relative to the seat mounting plate, wherein the mechanical extension device can be transformed from a lying position, a sitting position to a raised position in sequence through the lifting assembly, and can be transformed from a raised position, a sitting position to a lying position in reverse in sequence.

[0020] In order to solve the technical problem, the utility model also provides a movable seat. The movable seat includes a mechanical extension device, a seat part, a backrest and a footrest attached to the mechanical extension device. The mechanical extension device includes:

[0021] - A base fixed to the ground;

[0022] - a load-bearing frame movably arranged above the base, a seat mounting plate attached to the seat portion, a backrest bracket attached to the backrest, and a leg assembly attached to the footrest, wherein the leg assembly includes a footrest mounting plate and an outward-turning assembly; and

[0023] - A lifting assembly arranged between the base and the supporting frame, wherein a seat mounting plate is pivotally connected to the supporting frame, by means of which the supporting frame together with the seat mounting plate can be transformed between a sitting position and a raised position.

[0024] According to the utility model, the mechanical extension device can be transformed at least between a sitting position and a lying position, in which the front end of the outward-turned component is located in front of the footrest mounting plate, and the backrest bracket is tilted backward relative to the seat mounting plate, wherein the front end of the outward-turned component is higher than the front end of the backrest bracket.

[0025] Preferably, in the lying position, the height of the most front end of the eversion assembly relative to the ground is at least 490 mm. Preferably, in the lying position, the height of the most front end of the eversion assembly relative to the ground is at least 550 mm.

[0026] In a preferred embodiment, the outward-turning assembly includes a first outward-turning link, a second outward-turning link, a third outward-turning link and an outward-turning drive rod, wherein a four-bar linkage is formed by the footrest mounting plate, the first outward-turning link, the second outward-turning link and the third outward-turning link, and wherein the four-bar linkage can be driven to deform by the outward-turning drive rod, so that the front end of the outward-turning assembly is located in front of the footrest mounting plate.

[0027] In a preferred embodiment, the leg assembly also includes a first leg link, a second leg link, a third leg link and a fourth leg link, wherein the front ends of the third leg link and the fourth leg link are respectively hinged to the footrest mounting plate, wherein the front end of the outward-turning drive rod is hinged to the four-bar linkage, and the rear end of the outward-turning drive rod is hinged to the fourth leg link at a first hinge point.

[0028] In a preferred embodiment, the first outward-turning link includes a second hinge point arranged on its first free end, a fourth hinge point arranged on its second free end, and a third hinge point located between the second hinge point and the fourth hinge point, wherein the first outward-turning link is hinged to the outward-turning drive rod at the second hinge point and is hinged to the third outward-turning link at the fourth hinge point.

[0029] In a preferred embodiment, during the unfolding of the leg assembly, as the angle between the fourth leg link and the footrest mounting plate increases, the outward drive rod causes the second free end of the first outward link to pivot upward around the third hinge point.

[0030] In a preferred embodiment, the first outward-turned connecting rod is configured as a crank member, wherein a line connecting the second hinge point and the fourth hinge point is located in front of the third hinge point.

[0031] In a preferred embodiment, two ends of the second outward-turned connecting rod are respectively hinged to the front end of the footrest mounting plate and the third outward-turned connecting rod.

[0032] In a preferred embodiment, in the lying position, the front side of the backrest support is at most 22° with the horizontal plane. Preferably, in the lying position, the front side of the backrest support is at most 13° with the horizontal plane.

[0033] In a preferred embodiment, in the sitting position, the footrest is folded under the seat portion.

[0034] In a preferred embodiment, in the raised position, the seat mounting plate is raised relative to the base and tilted forward, and the seat portion is folded under the seat portion, wherein the mechanical extension device can be transformed from a lying position, a sitting position to a raised position in sequence through the lifting component, and can be transformed from a raised position, a sitting position to a lying position in reverse in sequence.

[0035] It should be noted here that the details and advantages described for the mechanical extension device also apply to a movable seat comprising such a mechanical extension device.

[0036] In addition, it should be noted that the "front-rear direction" or "longitudinal direction" in this application refers to the extension direction of the leg assembly of the movable seat or its mechanical extension device. Specifically, "front" refers to the direction toward the leg assembly, and "rear" refers to the direction toward the backrest assembly. "Left-right direction" or "lateral direction" refers to the direction of the movable seat or its mechanical extension device in the horizontal direction that is perpendicular to the "front-rear direction" or "longitudinal direction". BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0038] Figure 1 A mechanical extension device for a movable seat according to an embodiment of the present invention is schematically shown in a three-dimensional diagram, which is in a lying position;

[0039] Figure 2 Schematically shown in a stereogram Figure 1 The mechanical extension device shown is in a sitting position;

[0040] Figure 3 Schematically shown in side view Figure 1 The mechanical extension device is shown in the raised position;

[0041] Figure 4 Schematically shown in side view Figure 1 The seated position of the mechanical extension device shown;

[0042] Figure 5 Schematically shown in side view Figure 1 TV position of the mechanical extension device shown;

[0043] Figure 6 Schematically shown in side view Figure 1 The lying position of the mechanical extension device shown;

[0044] Figure 7 Schematically shown Figure 1 A partial enlarged view of the leg assembly of the mechanical extension device shown;

[0045] Figure 8 Schematically shown Figure 7 A partial enlarged view of another angle of the leg assembly shown. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] The term "one embodiment" or "embodiment" as referred to herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the utility model. In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here.

[0048] Figure 1 A mechanical extension device 1 of a movable seat according to an embodiment of the present invention is schematically shown in a three-dimensional diagram. In addition, the movable seat further comprises a seat portion, a backrest and a footrest (not shown) attached to the mechanical extension device 1 . Figure 1 The mechanical extension device 1 is shown in a lying position. Figure 2 The mechanical extension device 1 is shown in a sitting position.

[0049] The mechanical extension device 1 comprises a base 10, a linkage mechanism 11, a lifting assembly 12 and an electric drive unit 13. This movable chair has a lifting function and can assist the user to get up from the chair, and is also called an "elderly chair".

[0050] The base 10 is fixedly supported on the ground. The movable seat can be moved at least sequentially from Figure 1 and Figure 6 The lying position shown changes to Figure 2 and Figure 4 The sitting position shown, Figure 3 The movable seat can be in the raised position shown in the figure, and can be changed from the raised position, the sitting position to the lying position at least in sequence. Figure 5 The figure shows a transition to a TV position between a lying position and a sitting position.

[0051] exist Figure 1 and Figure 2 In the illustrated embodiment, the base 10 includes a rear base crossbeam 101 extending in the transverse direction of the movable seat, a front base crossbeam 102, and two base longitudinal beams 103 extending in the longitudinal direction and arranged at intervals on the left and right sides. The front base crossbeam 101, the rear base crossbeam 102, and the base longitudinal beams 103 constitute a rectangular base 10.

[0052] A linkage mechanism 11 is movably arranged above the base 10 . The linkage mechanism 11 is constructed as a multi-link mechanism and includes a supporting frame 110 , a seat assembly 111 , a backrest assembly 112 and a leg assembly 113 .

[0053] The supporting frame 110 is generally constructed as a rectangular frame and includes two supporting longitudinal beams 1100 extending in the longitudinal direction of the movable seat and arranged at intervals on the left and right sides, and a front supporting cross beam 1106 and a rear supporting cross beam 1107 extending between the two supporting longitudinal beams 1100 and connecting the supporting longitudinal beams 1100. At the front end of the supporting frame 110 near the leg assembly 113, in particular, Figure 2 In the illustrated embodiment, a front end extension 1101 is included on the front load beam 1106. A rear end extension 1102 is included at the rear end of the load beam 1100 near the backrest assembly 112.

[0054] It should be noted that the front extension 1101 can be a part of the front bearing crossbeam 1106 or a component fixedly connected to the front bearing crossbeam 1106. The rear extension 1102 can be a part of the bearing longitudinal beam 1100 or a component fixedly connected to the bearing longitudinal beam 1100.

[0055] The seat assembly 111 includes an L-shaped seat mounting member 1110, a front end mounting member 1111 constructed on the front end of the seat mounting member 1110, a seat front swing link 1112, a seat rear swing link 1113, a drive connecting rod 1114 and a laterally extending motor drive rod 1115.

[0056] The seat mounting member 1110 is used to attach the seat. The front mounting member 1111 is fixedly connected to the seat mounting member 1110, or is configured as a protrusion protruding upward from the front end of the seat mounting member 1110. One end of the driving connecting rod 1114 is pivotally connected to the front mounting member 111, and the other end is pivotally connected to the driving rod protrusion 1115a protruding from the two ends of the motor driving rod 1115. The front seat swing rod 1112 is configured as a crank member, which is pivotally connected to the front end of the seat mounting member 1110 at one free end and pivotally connected to the leg assembly 113 at the other free end at least indirectly through the leg driving rod 1116. One end of the seat rear swing rod 1113 is pivotally connected to the rear end of the seat mounting member 1110, and the other end is pivotally connected to the supporting frame 110, especially the supporting longitudinal beam 1100.

[0057] like Figure 4 As shown, the seat assembly 111 is movably connected to the supporting frame 110 through a transmission mechanism. The transmission mechanism includes a first transmission rod 1103, a second transmission rod 1104 and a third transmission rod 1105, wherein the middle portion of the seat front swing rod 1112 is pivotally connected to the front end of the first transmission rod 1103, the rear end of the first transmission rod 1103 is pivotally connected to the front end of the second transmission rod 1104, the middle portion of the first transmission rod 1103 is pivotally connected to the supporting longitudinal beam 1100, especially the rear end extension portion 1102 of the supporting longitudinal beam; the rear end of the second transmission rod 1104 is pivotally connected to the lower end of the third transmission rod 1105, the upper end of the third transmission rod 1105 is pivotally connected to the lower end of the seat rear swing rod 1113, and the middle portion of the third transmission rod 1105 is pivotally connected to the supporting longitudinal beam 1100, especially the rear end extension portion 1102 of the supporting longitudinal beam.

[0058] The backrest assembly 112 includes a backrest bracket 1120 and a backrest connecting rod 1121. The backrest bracket 1120 is used to attach the backrest, and the front end of the backrest bracket 1120 is pivotally connected to the upper end of the seat mounting member 1110, the rear end of the backrest bracket 1120 is pivotally connected to the upper end of the backrest connecting rod 1121, and the lower end of the backrest connecting rod 1121 is pivotally connected to the load-bearing longitudinal beam 1100, especially the rear end extension 1102 of the load-bearing longitudinal beam.

[0059] The leg assembly 113 is constructed as a multi-link mechanism and includes a first leg link 1131 , a second leg link 1132 , a third leg link 1133 , a fourth leg link 1134 , a pedal mounting plate 1135 for attaching a pedal, and an outward turning assembly pivotally connected to the pedal mounting plate 1135 .

[0060] like Figure 5 and Figure 6 As shown, the rear end of the first leg link 1131 is pivotally connected to the middle part of the seat front swing link 1112, and the front end of the first leg link 1131 is pivotally connected to the rear end of the fourth leg link 1134; the rear end of the second leg link 1132 is pivotally connected to the front end of the seat mounting member 1110, and the front end of the second leg link 1132 is pivotally connected to the rear end of the third leg link 1133; the front ends of the third leg link 1133 and the fourth leg link 1134 are both pivotally connected to the pedal mounting plate 1135. The middle part of the second leg link 1132 is also hinged to the middle part of the fourth leg link 1134.

[0061] like Figure 7 and Figure 8 As shown, the outward turning assembly is pivotally connected to the front part of the pedal mounting plate 1135, and for this purpose, a footrest front end extension 1135a is integrally constructed at the front part of the pedal mounting plate 1135. The outward turning assembly includes a first outward turning link 1136, a second outward turning link 1137, a third outward turning link 1138 and an outward turning driving rod 1139, wherein the pedal mounting plate 1135, the first outward turning link 1136, the second outward turning link 1137 and the third outward turning link 1138 form a four-bar linkage.

[0062] The first outward-turned connecting rod 1136 is constructed as a crank member, wherein the first outward-turned connecting rod 1136 includes a second hinge point P2 on its first free end, a fourth hinge point P4 on its second free end, and a third hinge point P3 located between the second hinge point P2 and the fourth hinge point P4. The line connecting the second hinge point P2 and the fourth hinge point P4 is located in front of the third hinge point P3.

[0063] The outward-turning driving rod 1139 includes a front end and a rear end that are substantially opposite to each other in the front-back direction. The outward-turning driving rod 1139 is pivotally connected to the fourth leg link 1134 of the leg assembly 113 at the first hinge point P1 by its rear end, and is hinged to the first outward-turning link 1136 at the second hinge point P2 by its front end. The first outward-turning link 1136 is hinged to the front-end extension 1135a of the foot pedal at the third hinge point P3, and is hinged to the third outward-turning link 1138 at the fourth hinge point P4. One end of the second outward-turning link 1137 is hinged to the front-end extension 1135a of the foot pedal, and the other end is hinged to the third outward-turning link 1138, wherein the second outward-turning link 1137 and the front-end extension 1135a of the foot pedal are more forward than the third hinge point P3.

[0064] During the unfolding process of the leg assembly 113, as the angle between the fourth leg link 1134 and the footrest mounting plate 1135 increases, the outward-turning drive rod 1139 causes the second free end of the first outward-turning link 1136 to pivot upward around the third hinge point P3, thereby causing the four-bar mechanism consisting of the footrest mounting plate 1135, the first outward-turning link 1136, the second outward-turning link 1137 and the third outward-turning link 1138 to deform through the outward-turning drive rod 1139, so that the front end of the outward-turning assembly is located in front of the footrest mounting plate 1135.

[0065] The lifting mechanism 12 includes a lifting base 120, a first lifting link 121 and a second lifting link 122. The lifting base 120 is fixedly mounted on the base longitudinal beam 101 of the base 10. The first lifting link 121 and the second lifting link 122 are respectively hinged at one end on the lifting base 120, and are respectively hinged at the other end on the supporting frame 110, specifically, hinged on the front end extension 1101 fixedly connected to the front supporting cross beam 1106. Thus, the lifting base 120, the first lifting link 121, the second lifting link 122 and the front end extension 1101 form a four-bar linkage, so that the lifting and lowering of the supporting frame 110 relative to the base 10 can be realized through the modification of the four-bar linkage, thereby driving the seat assembly 111, the backrest assembly 112 and the leg assembly 113 connected to the supporting frame 110 to lift and lower relative to the base 10. The second lifting link 122 is configured with a lifting stop plate 1220 on the side thereof facing the base 10. When the lifting mechanism 12 is not lifted, the lifting stop plate 1220 abuts against the upper surface of the base longitudinal beam 103 with its lower surface.

[0066] In order to facilitate the movable seat to change between different postures, an electric drive unit 13 is also provided. In this embodiment, the electric drive unit 13 includes only one motor. The motor can be configured as a push rod motor, which includes a motor head connected to the rear base cross beam 101 and a motor push rod that is telescopically movable relative to the motor head, and the motor push rod is connected to the motor drive rod 1115.

[0067] The electric drive unit 13 can cause the movable seat to be changed from a lying position to a sitting position and a raised position in sequence, or vice versa from a raised position to a sitting position and a lying position.

[0068] Of course, in an embodiment not shown, the electric drive unit 13 may also include two motors, one of which causes the movable seat to change between a sitting position and a lying position, and the other motor causes the movable seat to change between a raised position and a sitting position and / or a lying position.

[0069] When you want the movable seat to Figure 3 The lifting position shown changes to Figure 6 When the lifting mechanism 12 is in the lying position shown in the figure, the motor push rod begins to retract relative to the motor head. As a result, the lifting mechanism 12 is retracted, causing the supporting frame 110 and even the entire linkage mechanism 11 to descend relative to the base 10. When the lifting stop plate 1220 abuts against the base longitudinal beam 103, the lifting mechanism 12 stops retracting, the linkage mechanism 11 no longer descends, and the movable seat is realized. Figure 4 Sitting position shown.

[0070] At this time, the motor push rod continues to retract relative to the motor head. As a result, the motor drive rod 1115 is turned over, which in turn drives the drive link 1114 to pivot, and causes the front mounting member 1111 to push the seat mounting member 1110 to tilt backward. At the same time, the backrest assembly 112 tilts backward, and under the action of the transmission mechanism, the front swing rod 1112 of the seat pivots, and the leg drive rod 1116 moves forward, thereby pushing the leg assembly 113 to unfold. This achieves Figure 5 The TV posture position shown Figure 6 Lying position shown.

[0071] As mentioned above, during the unfolding process of the leg assembly 113, as the angle between the fourth leg link 1134 and the footrest mounting plate 1135 increases, the outward drive rod 1139 causes the second free end of the first outward link 1136 to pivot upward around the third hinge point P3, so that the front end of the outward assembly is located in front of the footrest mounting plate 1135.

[0072] In the lying position, the height H of the front end of the eversion assembly relative to the ground is at least 490 mm, preferably 550 mm; the angle α between the front side of the backrest bracket 1120 and the horizontal plane is at most 22°, preferably at most 13°.

[0073] List of Reference Numerals

[0074] 1 Mechanical extension device

[0075] 10 Base

[0076] 101 Rear base beam

[0077] 102 Front base beam

[0078] 103 Base beam

[0079] 11 Linkage mechanism

[0080] 110 Loading frame

[0081] 1100 Load-bearing longitudinal beam

[0082] 1101 Front end extension

[0083] 1102 rear end extension

[0084] 1103 First transmission rod

[0085] 1104 Second transmission rod

[0086] 1105 Third transmission rod

[0087] 1106 Front load beam

[0088] 1107 Rear load bearing beam

[0089] 111 Seat assembly

[0090] 1110 Seat mounting parts

[0091] 1111 Front mounting parts

[0092] 1112 Seat front swing bar

[0093] 1113 Seat rear swing bar

[0094] 1114 Driving connecting rod

[0095] 1115 Motor drive rod

[0096] 1115a Drive rod protrusion

[0097] 1116 Leg drive rod

[0098] 112 Backrest assembly

[0099] 1120 Backrest Bracket

[0100] 1121 Backrest connecting rod

[0101] 113 Leg Assembly

[0102] 1131 First Leg Link

[0103] 1132 Second Leg Link

[0104] 1133 Third Leg Link

[0105] 1134 Fourth Leg Link

[0106] 1135 Footrest mounting plate

[0107] 1135a Footrest front extension

[0108] 1136 First outward-turned connecting rod

[0109] 1137 Second outward-turned connecting rod

[0110] 1138 Third outward-turned connecting rod

[0111] 1139 Eversion drive rod

[0112] 12 Lifting mechanism

[0113] 120 Lifting Base

[0114] 121 First lifting link

[0115] 122 Second lifting link

[0116] 1220 lifting stop plate

[0117] 13 Electric drive unit

[0118] P1 First Pivot Point

[0119] P2 Second pivot point

[0120] P3 Third Pivot Point

[0121] P4 Fourth pivot point.

Claims

1. A mechanical extension device for a movable seat, characterized in that: The mechanical stretching device comprises: - A base fixed to the ground; - a load-bearing frame, a seat mounting plate, a backrest support and a leg assembly movably arranged above the base, wherein the leg assembly includes a footrest mounting plate and an outward-turning assembly; and - a lifting assembly arranged between the base and the supporting frame, wherein a seat mounting plate is pivotally connected to the supporting frame, by means of which the supporting frame together with the seat mounting plate can be changed between a sitting position and a raised position, Wherein, the mechanical extension device can be transformed at least between a sitting position and a lying position, in which, in the lying position, the front end of the outward-turned component is located in front of the footrest mounting plate, and the backrest bracket is tilted backward relative to the seat mounting plate, wherein the front end of the outward-turned component is higher than the front end of the backrest bracket.

2. The mechanical stretching device according to claim 1, characterized in that: In the lying position, the height of the forwardmost end of the eversion assembly relative to the ground is at least 490 mm.

3. The mechanical stretching device according to claim 1, characterized in that: In the lying position, the height of the frontmost end of the eversion assembly relative to the ground is at least 550 mm.

4. The mechanical stretching device according to claim 1, characterized in that: The outward-turning assembly includes a first outward-turning link, a second outward-turning link, a third outward-turning link and an outward-turning driving rod, wherein a four-bar linkage is formed by the pedal mounting plate, the first outward-turning link, the second outward-turning link and the third outward-turning link, and wherein the four-bar linkage can be driven to deform by the outward-turning driving rod, so that the front end of the outward-turning assembly is located in front of the pedal mounting plate.

5. The mechanical stretching device according to claim 4, characterized in that: The leg assembly also includes a first leg link, a second leg link, a third leg link and a fourth leg link, wherein the front ends of the third leg link and the fourth leg link are respectively hinged to the footrest mounting plate, wherein the front end of the outward-turning drive rod is hinged to the four-bar linkage, and the rear end of the outward-turning drive rod is hinged to the fourth leg link at a first hinge point.

6. The mechanical stretching device according to claim 5, characterized in that: The first outward-turning link includes a second hinge point arranged on its first free end, a fourth hinge point arranged on its second free end, and a third hinge point located between the second hinge point and the fourth hinge point, wherein the first outward-turning link is hinged to the outward-turning drive rod at the second hinge point, is hinged to the footrest mounting plate at the third hinge point, and is hinged to the third outward-turning link at the fourth hinge point.

7. The mechanical stretching device according to claim 6, characterized in that During the unfolding process of the leg assembly, as the included angle between the fourth leg link and the footrest mounting plate increases, the outward-turning driving rod causes the second free end of the first outward-turning link to pivot upward around the third hinge point.

8. The mechanical stretching device according to claim 6, characterized in that The first outward-turned connecting rod is configured as a crank member, wherein a line connecting the second hinge point and the fourth hinge point is located in front of the third hinge point.

9. The mechanical stretching device according to claim 6, characterized in that: Two ends of the second outward-turned connecting rod are respectively hinged to the front end of the pedal mounting plate and the third outward-turned connecting rod.

10. The mechanical stretching device according to claim 1, characterized in that In the lying position, the front side of the backrest support is at most 22° with the horizontal plane.

11. The mechanical stretching device according to claim 10, characterized in that In the lying position, the front side of the backrest support is at most 13° with the horizontal plane.

12. The mechanical stretching device according to claim 1, characterized in that In the sitting position, the leg assembly is retracted relative to the seat mounting plate.

13. The mechanical stretching device according to claim 12, characterized in that In the raised position, the seat mounting plate is raised and tilted forward relative to the base, and the leg assembly is folded relative to the seat mounting plate, wherein the lifting assembly enables the mechanical extension device to be sequentially transformed from a lying position, a sitting position to a raised position, and the lifting assembly enables the mechanical extension device to be sequentially transformed from a raised position, a sitting position to a lying position in reverse.

14. A movable seat, characterized in that: The movable seat comprises a mechanical extension device, a seat portion, a backrest and a footrest attached to the mechanical extension device, and the mechanical extension device comprises: - A base fixed to the ground; - a load-bearing frame movably arranged above the base, a seat mounting plate attached to the seat portion, a backrest bracket attached to the backrest, and a leg assembly attached to the footrest, wherein the leg assembly includes a footrest mounting plate and an outward-turning assembly; and - a lifting assembly arranged between the base and the supporting frame, wherein a seat mounting plate is pivotally connected to the supporting frame, by means of which the supporting frame together with the seat mounting plate can be changed between a sitting position and a raised position, Wherein, the mechanical extension device can be transformed at least between a sitting position and a lying position, in which, in the lying position, the front end of the outward-turned component is located in front of the footrest mounting plate, and the backrest bracket is tilted backward relative to the seat mounting plate, wherein the front end of the outward-turned component is higher than the front end of the backrest bracket.

15. The movable seat according to claim 14, characterized in that: In the lying position, the height of the forwardmost end of the eversion assembly relative to the ground is at least 490 mm.

16. The movable seat according to claim 14, characterized in that: In the lying position, the height of the frontmost end of the eversion assembly relative to the ground is at least 550 mm.

17. The movable seat according to claim 14, characterized in that: The outward-turning assembly includes a first outward-turning link, a second outward-turning link, a third outward-turning link and an outward-turning driving rod, wherein a four-bar linkage is formed by the pedal mounting plate, the first outward-turning link, the second outward-turning link and the third outward-turning link, and wherein the four-bar linkage can be driven to deform by the outward-turning driving rod, so that the front end of the outward-turning assembly is located in front of the pedal mounting plate.

18. The movable seat according to claim 17, characterized in that: The leg assembly also includes a first leg link, a second leg link, a third leg link and a fourth leg link, wherein the front ends of the third leg link and the fourth leg link are respectively hinged to the footrest mounting plate, wherein the front end of the outward-turning drive rod is hinged to the four-bar linkage, and the rear end of the outward-turning drive rod is hinged to the fourth leg link at a first hinge point.

19. The movable seat according to claim 18, characterized in that: The first outward-turning link includes a second hinge point arranged on its first free end, a fourth hinge point arranged on its second free end, and a third hinge point located between the second hinge point and the fourth hinge point, wherein the first outward-turning link is hinged to the outward-turning drive rod at the second hinge point and is hinged to the third outward-turning link at the fourth hinge point.

20. The movable seat according to claim 19, characterized in that: During the unfolding process of the leg assembly, as the included angle between the fourth leg link and the footrest mounting plate increases, the outward-turning driving rod causes the second free end of the first outward-turning link to pivot upward around the third hinge point.

21. The movable seat according to claim 19, characterized in that: The first outward-turned connecting rod is configured as a crank member, wherein a line connecting the second hinge point and the fourth hinge point is located in front of the third hinge point.

22. The movable seat according to claim 19, characterized in that: Two ends of the second outward-turned connecting rod are respectively hinged to the front end of the pedal mounting plate and the third outward-turned connecting rod.

23. The movable chair according to claim 15, characterized in that: In the lying position, the front side of the backrest support is at most 22° with the horizontal plane.

24. The movable seat according to claim 23, characterized in that: In the lying position, the front side of the backrest support is at most 13° with the horizontal plane.

25. The movable chair according to claim 15, characterized in that: In the sitting position, the footrest is tucked under the seat portion.

26. The movable chair according to claim 25, characterized in that: In the raised position, the seat mounting plate is raised relative to the base and tilted forward, and the seat portion is folded under the seat portion, wherein the lifting assembly enables the mechanical extension device to be sequentially transformed from a lying position, a sitting position to a raised position, and the mechanical extension device can be reversely transformed from a raised position, a sitting position to a lying position.

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