CN213820608U

CN213820608U - Power stretching device

Info

Publication number: CN213820608U
Application number: CN202021987425.3U
Authority: CN
Inventors: 陈永春; 黄忠良; 李立波; 李文才; 施振杰
Original assignee: UE Furniture Co Ltd
Current assignee: UE Furniture Co Ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2021-07-30
Anticipated expiration: 2030-09-11

Abstract

The utility model discloses a power extension device, which comprises a base, two mechanical extension units, a transmission part and a linear actuator, wherein the two mechanical extension units are arranged on the base in a mirror image manner, and each extension unit comprises a footrest component, a cushion support component and a backrest component; two ends of the transmission piece are respectively connected with the first transverse connecting rods in the two mechanical stretching units; a linear actuator for driving the unit to adjust between stowed, extended and reclined positions; the linear actuator comprises a motion module and a power source; the motion module is arranged in front of the power source, and the transmission part is connected with the power source; compared with the prior art, when a user sits on the sofa using the device, the gravity center is almost completely positioned on the seat part, the weight borne by the feet is small, and the power source is arranged behind the motion module so as to provide larger driving force and supporting force; the closer the power source and the motion module are, the larger the supporting force and the driving force which can be provided by the power source are, so that the overall motion is more stable.

Description

Power stretching device

Technical Field

The present invention relates to the field of sports upholstered furniture for supporting the body of a user in a substantially seated position, and more particularly to a powered stretching device.

Background

Reclining seating units currently exist on the market that allow a user to extend a footrest or ottoman forward relative to a seat and recline a backrest rearward. These existing seating units generally provide three basic positions: a standard non-reclined stowed position; an extended position; and a reclined position. In the stowed position, the base is in a generally horizontal orientation and the backrest is disposed substantially upright. Additionally, if the seating unit includes an ottoman to which the mechanism is attached, the mechanism folds so that the ottoman does not extend. In the extended position, commonly referred to as the television ("TV") position, the ottoman is extended forward of the seat portion while the backrest and seat cushion are rotated backward through an angle of about 4 degrees to ensure that the occupant of the seating unit is comfortably watching television; in the reclined position, the backrest is positioned rearwardly from the extended position at an obtuse angle to the seat for resting or sleeping.

Many modern seating units in the current industry, such as recliners or sofas, are adapted for the above-mentioned adjustment function; it is currently common to use a wrench to control the opening of the seating unit; however, in order to expand the application range of the seat unit and improve the comfort level of the seat unit, many seat units are provided with power adjustment by combining a motor, and the backrest, the seat cushion and the leg rest are driven by the motor to drive the backrest, the seat cushion and the leg rest to open or close so as to meet the application requirements.

While many conventional reclining chairs operate satisfactorily, furniture manufacturers are continually seeking to develop improved chair frames and functional racks to reduce the complexity of the system. The utility model discloses a put forward in the utility model patent of application number "201110021296.1" has proposed a motor tube drives the link gear and the seat unit of footrest subassembly motion before through linear actuator drive, its linear actuator exists with the form of a motor slider in the front at the back, from drawing in the in-process of position to the position of stretching to the position of leaning back again, motor linear drive slider is released the slider, the distance of motor and slider is bigger and bigger, for the effort that linear actuator provided, the effect is relatively poor. Therefore, the seat unit has the problem of poor stability, and the supporting force and the driving force which can be provided by the linear actuator are reduced due to the long distance between the motor and the slide block; when a user sits on the chair with the seat unit in a side leaning posture, the gravity center of the user can shift towards the linkage mechanism at one side, so that the two linkage mechanisms are unevenly stressed, and particularly when the linear actuator drives the linkage mechanisms to move, the synchronous movement can generate left-right deviation, the movement at two sides is not synchronous, the fluctuation is generated, and the comfort is greatly reduced.

Disclosure of Invention

In order to solve the above technical problem, the present invention provides a power stretching device, which is capable of maintaining the left and right balance and stability of the power stretching device during the movement process and providing a greater driving force and supporting force for a linear actuator through a full link type mechanical stretching unit and a more stable arrangement of the linear actuator.

The technical scheme of the utility model is realized like this:

a powered stretching device comprising:

the folding stool comprises a base, wherein two mechanical stretching units are arranged on the base in a mirror symmetry manner, and each mechanical stretching unit comprises a footrest component, a cushion supporting component and a backrest component;

the two ends of the transmission part are respectively connected with first transverse connecting rods in the two mechanical stretching units, the first transverse connecting rods span the cushion supporting assembly, and the front end and the rear end of the first transverse connecting rods are respectively in rotary connection with the footrest assembly and the backrest assembly;

the linear actuator is arranged between the two mechanical extension units and is used for driving the mechanical extension units to adjust among the folding, extending and reclining positions, and the rear end of the linear actuator is connected with the transmission piece; the linear actuator comprises a motion module and a power source; the motion module is arranged in front of the power source, and the transmission part is connected with the power source;

the adjustment of the linear actuator is divided into a first stage and a second stage which are independent in stroke in sequence;

the first stage is as follows: when the power source is close to the motion module and provides power to enable the linear actuator to apply forward pulling force to the transmission piece, the first transverse connecting rod moves forwards along with the power source and drives the footrest assembly to be adjusted from the folding position to the extending position; when the power source is far away from the motion module and provides power to enable the linear actuator to apply backward thrust to the transmission piece, the first transverse connecting rod moves backward along with the power source and drives the footrest assembly to be adjusted from the extending position to the folding position;

and a second stage: when the motion module is close to the power source and the linear actuator does not apply the tension to the transmission member, the cushion support assembly and the backrest assembly are adjusted from the extending position to the reclining position; when the motion module is away from the power source and the linear actuator does not apply the pushing force to the transmission member, the cushion support assembly and the backrest assembly are adjusted from the reclined position to the extended position.

In the first stage, when the power source actively approaches the motion module, namely the linear actuator applies forward pulling force to the transmission member, the footrest assembly is adjusted from the folded position to the extended position, otherwise, the footrest assembly is adjusted from the extended position to the folded position; in the second stage, when the motion module is actively close to the power source, the cushion support assembly and the backrest assembly are adjusted from the extending position to the backward-leaning position, otherwise, the cushion support assembly and the backrest assembly are adjusted from the backward-leaning position to the extending position. When a user sits on the sofa or the seat using the power stretching device, the gravity center of the human body is almost completely located in the seat part (namely the cushion supporting component area), and the weight borne by the feet (namely the footrest component) is very small, so that the power source is arranged behind the motion module to be close to the gravity center of the user, and therefore in the process that the stretching position changes towards the backward-leaning position, the driving force and the supporting force provided by the power source positioned behind the motion module are larger, and the process is more stable. In the process of going from the folding position to the extending position and then to the backward-leaning position, the power source is closer to the motion module, the supporting force and the driving force which can be provided by the power source are larger, and the overall motion is more stable.

Preferably, the transmission member is a U-shaped transmission curved tube, an opening of the transmission curved tube is arranged towards the front, and the transmission curved tube is provided with a main body part perpendicular to the linear actuator and two connecting parts parallel to the mechanical stretching unit; the two end parts of the main body part are positioned beside the two mechanical extension units, and the connecting part is connected with the end parts of the main body part; the power source is connected with the middle part of the main body part, and the connecting part is relatively and fixedly connected with the first transverse connecting rod through a right-angle connecting piece. The arrangement of the transmission curved pipe is beneficial to the spatial configuration of the device, so that the device is more compact, and meanwhile, the transmission curved pipe and the driven curved pipe can be prevented from colliding together.

Preferably, the power source is a motor mechanism, a slide rail facing forward is arranged on the motor mechanism, the motion module is a slide block arranged on the slide rail, and the slide block is driven by the motor mechanism to move along the slide rail.

Preferably, the seat cushion further comprises a driven curved tube connected with the motion module, two ends of the driven curved tube are respectively connected with first rotating members in the two mechanical extension units, and the first rotating members are configured to drive the seat cushion support assembly and the backrest assembly to adjust between the extension position and the reclining position when rotating relative to the base.

Preferably, the seat cushion support assembly includes a seat mounting plate, the back assembly including a back member pivotally coupled to the seat mounting plate, a back drive linkage for moving the back assembly between an extended position and a reclined position, the back drive linkage including a bottom link fixedly connected to a base, the bottom link being positioned below the seat mounting plate and relatively parallel to the seat mounting plate; the first rotating piece is rotatably connected to the middle part of the seat part mounting plate, the middle part of the bottom connecting rod is hinged with a second rotating piece, and the first rotating piece is rotatably connected with the second rotating piece; the first rotating piece rotates along with the driven curved tube relative to the second rotating piece to drive the seat mounting plate to be far away from or close to the bottom connecting rod; the backrest driving connecting rod mechanism further comprises two crank connecting rods which are respectively and rotatably connected to the head end and the tail end of the bottom connecting rod, each crank connecting rod comprises two branches, a front supporting piece and a rear supporting piece are respectively hinged to one branch of each of the two crank connecting rods, the front supporting piece and the rear supporting piece are respectively connected with the head end and the tail end of the seat mounting plate and used for driving the two crank connecting rods to rotate when the seat mounting plate is far away from or close to the bottom connecting rod, and then the backrest driving connecting rod mechanism is triggered to drive the backrest assembly to move between an extending position and a backward bending position; the other branch of each of the two crank links is always parallel to the first rotating member during movement of the backrest assembly between the extended position and the reclined position.

Preferably, the backrest driving link mechanism further comprises a second transverse connecting rod located on one side of the seat mounting plate, the tail end of the second transverse connecting rod is rotatably connected with the backrest part, the front end of the second transverse connecting rod is hinged with a front longitudinal connecting rod, the front longitudinal connecting rod is a crank connecting rod located at the head end of the bottom connecting rod, two branches of the front longitudinal connecting rod are respectively a first connecting plate and a second connecting plate, the first connecting plate and the second connecting plate are arranged in a crossed mode to form a V-shaped structure, the bottom connecting rod is hinged with the front longitudinal connecting rod at the intersection of the first connecting plate and the second connecting plate, the first connecting plate is hinged with the second transverse connecting rod, the second connecting plate is hinged with the front supporting part, and the first connecting plate is always parallel to the first rotating part.

Preferably, a clamping groove is formed in the intersection of the first connecting plate and the second connecting plate of the front longitudinal connecting rod, a limiting piece is arranged on the front supporting piece, and the limiting piece abuts against the inner wall of the clamping groove when the backrest piece is located at the folding position, the extending position and the position between the folding position and the extending position.

Preferably, the backrest assembly further comprises a third transverse connecting rod and a crank connecting piece, the tail end of the third transverse connecting rod is hinged to the tail end of the backrest piece, the middle of the third transverse connecting rod is hinged to the tail end of the second transverse connecting rod, the crank connecting piece is a crank connecting rod located at the tail end of the bottom connecting rod, two branches of the crank connecting piece are respectively a third connecting plate and a fourth connecting plate, the third connecting plate and the fourth connecting plate are arranged in a crossed mode to form a V-shaped structure, the third connecting plate is hinged to the head end of the third transverse connecting rod, the bottom connecting rod is connected with the crank connecting piece at the crossed position of the third connecting plate and the fourth connecting plate, the fourth connecting plate is hinged to the rear supporting piece, and the third connecting plate is always parallel to the first rotating piece.

Preferably, a second protrusion is arranged on the third transverse connecting rod, and when the backrest is in the reclining position, the second protrusion abuts against the side wall of the rear supporting piece.

Preferably, the first transverse link is disposed in parallel on one side of the seat mounting plate, the first transverse link is rotatably coupled to a first ottoman link of the ottoman assembly, the ottoman assembly further includes a second ottoman link, a tail end of the first ottoman link, a tail end of the second ottoman link and the seat mounting plate are hinged, a tail end of the first transverse link is hinged to a rear longitudinal link, the rear longitudinal link is hinged to the seat mounting plate through a rear support, and the seat mounting plate, the first ottoman link, the second ottoman link, the first transverse link, the rear longitudinal link and the rear support form an ottoman link mechanism for driving the ottoman assembly to move between a closed position and an extended position relative to the seat mounting plate.

Preferably, a support assembly for supporting the mechanical extension unit is provided on the base.

Preferably, the supporting component comprises a supporting plate, the supporting plate is connected with the base, a connecting rod set is hinged to the supporting plate and comprises a plurality of supporting connecting rods, the heads and the tails of two adjacent supporting connecting rods are hinged to each other, the supporting connecting rod at the head end is hinged to the supporting plate, and the supporting connecting rod at the tail end is fixedly connected with the bottom connecting rod.

Preferably, the support connecting rod at the tail end is rotatably connected with a bent connecting rod, the bent connecting rod is divided into a first extending section and a second extending section along the length direction of the bent connecting rod, the second extending section is hinged with the support connecting rod, the first extending section is bent along the length direction of the first extending section to the direction far away from the bottom connecting rod, and the first extending section is hinged with the rear longitudinal connecting rod.

Preferably, the second extension is curved along its length in a direction away from the mechanical extension unit.

Preferably, the power source can be a motor, an air cylinder or an oil cylinder.

Adopted above-mentioned technical scheme the utility model discloses a design departure point, theory and beneficial effect are:

the utility model has the advantages that:

1. when a user sits on the sofa or the seat using the power stretching device, the gravity center of the human body is almost completely located in the seat part (namely the cushion supporting component area), and the weight borne by the feet (namely the footrest component) is small, so that the power source is arranged behind the motion module to be close to the gravity center of the user, and therefore in the process that the stretching position is changed to the backward-leaning position, the driving force and the supporting force provided by the power source positioned behind the motion module are larger, and the process is more stable. In the process of going from the folding position to the extending position and then to the backward-leaning position, the power source is closer to the motion module, the supporting force and the driving force which can be provided by the power source are larger, and the overall motion is more stable.

2. The first rotating piece located between the seat portion mounting plate and the base rotates relative to the second rotating piece to drive the seat portion mounting plate to be far away from or close to the base to achieve lifting of the seat portion mounting plate. When realizing that the seat mounting panel goes up and down, because first rotation piece is located the middle part of seat mounting panel, the second rotates the middle part that is located the bottom connecting rod, and first rotation piece has also constituted the middle part of seat mounting panel with the second and has supported, strengthens the bearing capacity of seat mounting panel, has improved the stability of structure.

3. The seat mounting plate is driven to ascend or descend by the backrest driving connecting rod mechanism and the backrest piece is driven to move, the transmission mode that the seat frame is jacked up by the sliding grooves commonly used in the market is overcome, the seat frame is stable in movement, the stretching process is coherent without micro-jumping perception, the seat frame has excellent experience feeling, and the requirement of people for comfort of materials is met more.

4. The head end both ends of bottom connecting rod all articulate there is the crank connecting rod, and two crank connecting rods articulate respectively has preceding support piece and back support piece. In the rotating process, the front supporting piece and the rear supporting piece not only realize the movement of the driving backrest piece, but also play a supporting role in the seat mounting plate, and the stability of the structure is improved.

5. Two crank connecting rods all are the V-arrangement, and their own one of them branch is parallel with first commentaries on classics piece all the time in the rotation process for the relative lifting height of front support piece, back support piece is the same with the lifting height of first commentaries on classics piece for the second commentaries on classics piece, makes the whole parallel up-and-down movement of seat mounting panel, and at the lift in-process, the seat mounting panel is whole can not have great unsmooth fluctuation to change, has improved the comfortable degree of person of taking.

Drawings

Fig. 1 is a top view of the power stretching device in an embodiment of the present invention;

fig. 2 is a first side view of the mechanical extension unit in the stowed position according to an embodiment of the present invention;

fig. 3 is a side view of the mechanical extension unit in a reclined position in accordance with an embodiment of the present invention;

FIG. 4 is a side view of the footrest assembly and footrest linkage assembly in an embodiment of the present invention with the footrest assembly in a collapsed position;

FIG. 5 is a side view of the footrest assembly and footrest linkage in an embodiment of the present invention with the footrest assembly in an extended position;

FIG. 6 is a side view of the back assembly and back drive linkage in an embodiment of the invention with the back assembly in an extended position;

fig. 7 is a side view of the back assembly and back drive linkage in an embodiment of the invention with the back assembly in a reclined position;

FIG. 8 is a schematic structural view of a front longitudinal link according to an embodiment of the present invention;

fig. 9 is a schematic structural view of a crank connecting member according to an embodiment of the present invention;

fig. 10 is a schematic structural view of a bent connecting rod according to an embodiment of the present invention;

fig. 11 is a schematic structural view of a backrest of an embodiment of the present invention;

fig. 12 is a schematic perspective view of the mechanical stretching unit in the folded position according to the embodiment of the present invention;

fig. 13 is a schematic perspective view of the mechanical stretching unit in the stretching position according to the embodiment of the present invention;

fig. 14 is a schematic perspective view and a partial enlarged view of the mechanical stretching unit in the reclining position according to the embodiment of the present invention.

Fig. 15 is a second side view of the mechanical extension unit in the stowed position in accordance with an embodiment of the present invention;

fig. 16 is a second side view of the mechanical extension unit in a reclined position in accordance with an embodiment of the present invention;

fig. 17 is a schematic perspective view of the power stretching device in a reclining position according to the embodiment of the present invention;

fig. 18 is a schematic perspective view of the power stretching device in the stretching position according to the embodiment of the present invention;

fig. 19 is a schematic perspective view of the power stretching device in the folded position according to the embodiment of the present invention.

The figures are numbered: 1-a base; 2-a mechanical stretching unit; 3-a footrest assembly; 31-a footrest; 32-a first ottoman link; 33-a second ottoman link; 34-a third ottoman link; 35-a fourth ottoman link; 4-a cushion support assembly; 41-seat mounting plate; 5-a backrest assembly; 51-a backrest; 511-a backrest insertion section; 512-connecting segment; 52-a second transverse link; 53-third transverse link; 531-second protrusions; 54-crank attachment; 541-a third connecting plate; 542-a fourth connecting plate; 6-a first transverse link; 7-rear longitudinal connecting rod; 71-a limiting groove; 8-rear support piece; 9-front longitudinal link; 91-a first connection plate; 92-a second connecting plate; 93-card slot; 10-a front support; 101-a stop; 11-a bottom link; 12-a support assembly; 121-a support plate; 122-support link; 123-bending connecting rod; 1231-a first extension; 1232-a second extension; 13-a linear actuator; 131-a motor mechanism; 132-a drive bend; 1321-a body portion; 1322-a connecting portion; 133-driven curved pipe; 134-a slider; 135-a slide rail; 14-a first rotating member; 15-second rotating member.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" means one or more unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The specific implementation manner of the utility model is as follows:

referring to fig. 1-19, the present embodiment provides a power stretching apparatus, which includes a base 1, two mechanical stretching units 2, a transmission member, and a linear actuator 13, wherein the two mechanical stretching units 2 are disposed on the base 1 in a mirror symmetry. In the present embodiment, each mechanical extension unit 2 includes a footrest assembly 3, a cushion support assembly 4, and a backrest assembly 5; two ends of the transmission piece are respectively connected with the first transverse connecting rods 6 in the two mechanical stretching units 2, the first transverse connecting rods 6 span the cushion supporting component 4, and the front end and the rear end of the first transverse connecting rods are respectively in rotary connection with the footrest component 3 and the backrest component 5; the linear actuator 13 is arranged between the two mechanical extension units 2 and is used for driving the mechanical extension units 2 to adjust between a folding position, an extending position and a reclining position, and the rear end of the linear actuator 13 is connected with the transmission piece; the linear actuator 13 includes a motion module and a power source; the motion module is arranged in front of the power source, and the transmission member is connected with the power source.

The adjustment of the linear actuator 13 is divided into a first stage and a second stage which are independent in stroke in turn; the first stage is as follows: as shown in fig. 18 and 19, when the power source is close to the motion module and provides power to cause the linear actuator 13 to apply a forward pulling force to the transmission member, the first transverse link 6 moves forward therewith and causes the footrest assembly 3 to adjust from the collapsed position to the extended position; when the power source is far away from the motion module and provides power to enable the linear actuator 13 to apply backward thrust to the transmission piece, the first transverse connecting rod 6 moves backwards along with the power source and drives the footrest assembly 3 to be adjusted from the stretching position to the folding position; and a second stage: as shown in fig. 17 and 18, when the motion module is close to the power source and the linear actuator 13 is not applying the above-mentioned pulling force to the transmission member, the seat cushion support assembly 4 and the backrest assembly 5 are adjusted from the extended position to the reclined position; when the motion module is away from the power source and the linear actuator 13 is not applying the above-described thrust to the transmission, the cushion-support assembly 4 and the backrest assembly 5 are adjusted from the reclined position to the extended position.

Specifically, in the present embodiment, the power source is a motor mechanism 131, a slide rail 135 facing forward is disposed on the motor mechanism 131, the moving module is a slider 134 disposed on the slide rail 135, and the slider 134 is driven by the motor mechanism 131 and reciprocates along the slide rail 135; the transmission member is a U-shaped transmission curved tube 132, an opening of the transmission curved tube 132 is arranged towards the front, and the transmission curved tube 132 is provided with a main body part 1321 perpendicular to the sliding rail 135 and two connecting parts 1322 parallel to the mechanical extension unit; the two ends of the main body 1321 are disposed near the mechanical stretching units 2 and beside the two mechanical stretching units 2, and the connecting part 1322 is connected to the end of the main body 1321 and disposed next to the mechanical stretching units 2; the motor mechanism 131 is connected with the middle part of the main body part 1321, and the connecting part 1322 is relatively and fixedly connected with the first transverse connecting rod 6 through a right-angle connecting sheet; in addition, the seat cushion support device further comprises a driven curved tube 133 connected with the slide block 134, the driven curved tube 133 is connected below the slide block 134 in an upward opening manner, two ends of the driven curved tube 133 are respectively connected with the first rotating members 14 of the two mechanical extension units 2, and the first rotating members 14 are configured to enable the first rotating members 14 to drive the seat cushion support assembly 4 and the backrest assembly 5 to be adjusted between the extension position and the reclining position when rotating relative to the base 1.

It can be seen that the first stage of the adjustment is generated by the linear actuator 13 driving the transmission curved tube 132 and driving the first transverse connecting rod 6 to move, and at this time, visually, the sliding block 134 is stationary relative to the base 1, and the motor mechanism 131 and the sliding rail 135 move synchronously, so that the linear actuator 13 applies a forward pulling force or a backward pushing force to the transmission curved tube 132 to drive the transmission curved tube 132 to move; the second stage is generated by the linear actuator 13 driving the driven curved tube 133 and driving the first rotating member 14 to move, and at this time, visually, the motor mechanism 131 and the sliding rail 135 are stationary relative to the base 1, and the slider 134 moves along the sliding rail 135 and drives the driven curved tube 133 to move; the strokes of the first and second stages are independent of each other and do not interfere with each other, and this effect is achieved by a limiting member on the mechanical extension unit 2, which will be explained in detail below.

Both ends of the driving bent pipe 132 are connected to the footrest assemblies 3 in the two mechanical extension units, respectively. Wherein, footrest subassembly 3 includes footrest 31, be connected with third ottoman connecting rod 34 and fourth ottoman connecting rod 35 on the footrest 31, third ottoman connecting rod 34 is parallel to each other with fourth ottoman connecting rod 35, and it has first ottoman connecting rod 32 to articulate on the third ottoman connecting rod 34, and it has second ottoman connecting rod 33 to articulate on the fourth ottoman connecting rod 35, and first ottoman connecting rod 32 parallels with second ottoman connecting rod 33, and second ottoman connecting rod 33 and third ottoman connecting rod 34 intercrossing just are articulated mutually in the intersection. The cushion support assembly 4 includes a seat mounting plate 41, and the first transverse link 6 is disposed in parallel on one side of the seat mounting plate 41. The first transverse link 6 has a head end rotatably coupled to the first ottoman link 32, and a tail end of the first ottoman link 32 (i.e., the end remote from the footrest 31), and a tail end of the second ottoman link 33 are each hingedly connected to the seat mounting plate 41. The drive crank 131 drives the first cross link 6 to drive the first ottoman link 32 to extend forward, which in turn drives the third ottoman link 34, the second ottoman link 33 and the fourth ottoman link 35 to extend the top-up footrest 31 forward to the extended position. When the footrest 31 is in the extended position, the position limiter on the second ottoman link 33 abuts against the side wall of the third ottoman link 34 to form a stroke limit, so that the first-stage adjustment of the mechanical extension unit 2 from the folded position to the extended position is limited, but the first-stage adjustment from the extended position to the folded position or the second-stage adjustment from the extended position to the reclined position can be performed.

Meanwhile, the tail end (i.e. the end far away from the footrest 31) of the first transverse connecting rod 6 is hinged with the rear longitudinal connecting rod 7, and the middle part of the rear longitudinal connecting rod 7 is hinged with a crank connecting piece 54, wherein the crank connecting piece 54 is one part in the backrest assembly. In this embodiment, as shown in fig. 9, the crank connector 54 includes a third connecting plate 541 and a fourth connecting plate 542, and the third connecting plate 541 and the fourth connecting plate 542 are arranged to intersect with each other to form a V-shaped structure. Wherein the fourth connecting plate 542 is hinged with a rear support 8. The crank connector 54 is connected to the seat mounting plate 41 through the rear support 8. Specifically, the rear end of the rear support member 8 (i.e., the end away from the backrest 51) is hinged to the fourth connecting plate 542 of the crank connecting member 54, and the head end of the rear support member 8 is fixedly connected to the seat mounting plate 41. Meanwhile, the rear longitudinal link 7 is hinged to the crank connector 54 at the intersection of the third connecting plate 541 and the fourth connecting plate 542.

The first ottoman link 32 and the second ottoman link 33 form an ottoman linkage, and a generally quadrilateral self-locking closed loop ottoman linkage is formed by the seat mounting plate 41, the ottoman linkage, the first transverse link 6, the rear longitudinal link 7, the crank link 54 and the rear support 8, so as to cooperate with the ottoman assembly 3 to perform a telescopic action to support the ottoman assembly 3 when the ottoman assembly 3 moves between the closed position and the extended position relative to the seat mounting plate 41, thereby preventing the ottoman assembly 3 from moving and deforming.

When the first transverse link 6 is moved toward the footrest 31, the footrest linkage is expanded in operation as shown in fig. 5. Conversely, when the first transverse link 6 is moved in a direction away from the footrest 31, the footrest link mechanism is operated to contract. The connecting rod assemblies are formed by the connecting rods, the connecting rod mechanisms move stably in the contraction process of the footrest assembly 3, so that the footrest assembly 3 is continuously stretched without micro-jump sensing, excellent experience feeling is achieved, and the comfort level of a product is improved.

In this embodiment, the backrest module 5 comprises a backrest member 51, a second transverse link 52 and a third transverse link 53. In this embodiment, as shown in fig. 11, the backrest 51 is an L-shaped link, and the backrest insertion section 511 and the connection section 512 are respectively provided at both sides of the bent portion. Wherein the backrest insertion section 511 is used for inserting the backrest. The connecting section 512 is hinged with the third transverse link 53 and the backrest 51 is hinged with the seat mounting plate 41 at the bend.

The second transverse link 52 is arranged at one side of the first transverse link 6 in parallel, and the third transverse link 53 is hinged with the tail end of the second transverse link 52. The front end (i.e. the end close to the footrest 31) of the second transverse connecting rod 52 is also hinged with a front longitudinal connecting rod 9, the middle part of the front longitudinal connecting rod 9 is hinged with a bottom connecting rod 11 fixedly connected with the base 1, the bottom connecting rod 11 is hinged with the tail end of the rear longitudinal connecting rod 7, and the third connecting plate 541 of the crank connecting piece 54 is hinged with the third transverse connecting rod 53. And as in the footrest link mechanism described above, the fourth connecting plate 542 of the crank connector 54 is also hinged to the rear support 8, and the crank connector 54 is connected to the seat mounting plate 41 through the rear support 8. Specifically, the rear end of the rear support 8 is hinged to the crank connector 54, and the head end of the rear support 8 is fixedly connected to the seat mounting plate 41. Meanwhile, the rear longitudinal link 7 is hinged to the crank connector 54 at the intersection of the third connecting plate 541 and the fourth connecting plate 542.

The backrest driving linkage mechanism is formed by the third transverse link 53, the second transverse link 52, the front longitudinal link 9, the bottom link 11, the rear longitudinal link 7 and the crank connecting piece 54 to drive the backrest assembly 5 to move between the extended position and the reclined position.

In this embodiment, the bottom link 11 is located below the seat mounting plate 41 and is substantially parallel to the seat mounting plate 41. And the middle part of the seat part mounting plate 41 is hinged with a first rotating part 14, the middle part of the bottom connecting rod 11 is hinged with a second rotating part 15, and the first rotating part 14 is rotatably connected with the second rotating part 15. Both ends of the driven bent pipe 133 are connected to the first rotating members 14 in the two mechanical extension units 2, respectively. In order to avoid interference of the first rotating member 14 with the first transverse link 6, the second transverse link 52 and the bottom link 11 during rotation, in this embodiment, as shown in fig. 14, the first rotating member 14 includes a first rotating plate 141, a second rotating plate 142, a third rotating plate 143 and a fourth rotating plate 144, and the first rotating plate 141, the second rotating plate 142, the third rotating plate 143 and the fourth rotating plate 144 are sequentially arranged to intersect in the longitudinal direction of the first rotating member 14, so that the first rotating member 14 has a W-shaped structure. Wherein the first rotating plate 141 is hinged with the seat mounting plate 41, and the first and second

transverse links

6 and 52 are located between the first and second

rotating plates

141 and 142. And the second rotating member 15 is hinge-coupled to the third rotating plate 143, and the fourth rotating plate 144 is connected to the driven curved pipe 133.

In this embodiment, when the footrest assembly 3 is moved to the extended position, the motor mechanism 131 is still operating to force the transmission curved tube 131 to move forward through the slider 134, but the limit of the stroke is formed because the limit stop on the second ottoman link 33 abuts against the side wall of the third ottoman link 34. The sliding block 134, which can slide relative to the sliding rail 135, moves, that is, the motor mechanism 131 drives the driven curved tube 133 to move, so that the first rotating member 14 rotates with the driven curved tube 133 relative to the second rotating member 15. The sum of the longitudinal lengths of the first and second

rotating members

14, 15 increases, thereby moving the seat mounting plate 41 away from the bottom link 11. Because the first rotating member 14 is located in the middle of the seat mounting plate 41, the second rotating member 15 is located in the middle of the bottom link 11, and the first rotating member 14 and the second rotating member 15 also form a middle support of the seat mounting plate 41, the bearing capacity of the seat mounting plate 41 is enhanced, and the structural stability is improved. And during this process, when the backrest drive linkage is operated (i.e., when the backrest module 5 moves to the reclined position), the longitudinal distance between the second transverse link 52 and the bottom link 11 increases, as shown in fig. 7, the second transverse link 52 moves away from the backrest 51, pulling the third transverse link 53 to flip the backrest 51 relative to the seat mounting plate 41 until the backrest 51 is in the reclined position.

Meanwhile, the head end and the tail end of the bottom connecting rod 11 can be rotatably connected with crank connecting rods. Each crank link comprises two branches. Specifically, the two crank links are the crank connector 54 and the front longitudinal link 9, respectively. The two branches of the crank connecting element 54 are a third connecting plate 541 and a fourth connecting plate 542.

In the scheme, a front supporting piece 10 is arranged at the tail end of the front longitudinal connecting rod 9. During the process that the first rotating member 14 rotates along with the driven curved tube 133 relative to the second rotating member 15, the front longitudinal connecting rod 9 and the crank connecting member 54 rotate, the sum of the longitudinal lengths of the front longitudinal connecting rod 9 and the front supporting member 10 increases, the sum of the longitudinal lengths of the crank connecting member 54 and the rear supporting member 8 increases, the bottom connecting rod 11 and the seat mounting plate 41 are supported at the head end and the tail end of the bottom connecting rod 11 and the seat mounting plate 41, so that the seat mounting plate 41 is far away from the bottom connecting rod 11, and the seat mounting plate 41 is far away from the bottom connecting rod 11 due to the fixed connection of the bottom connecting rod 11 and the base 1, namely, the ascending action of the seat mounting plate 41 is completed. The front support piece 10 and the rear support piece 8 not only realize the movement of the driving backrest, but also the front support piece 10 and the rear support piece 8 support the seat mounting plate, thereby improving the stability of the structure.

Referring to fig. 8, two branches of the front longitudinal link 9 are a first connecting plate 91 and a second connecting plate 92, and the first connecting plate 91 and the second connecting plate 92 are crossed to form a V-shaped structure. The bottom link 11 is hinged to the front longitudinal link 9 at the intersection of the first connecting plate 91 and the second connecting plate 92, the first connecting plate 91 is hinged to the second transverse link 52, and the second connecting plate 92 is hinged to the front support 10. The front support member 10 is fixedly connected to the seat mounting plate 41, and the front longitudinal link 9 is turned over when the back drive link mechanism is operated, during which the longitudinal distance between the second transverse link 52 and the bottom link 11 is increased. Since the front longitudinal link 9 is hinged to the bottom link 11 at the intersection of the first connecting plate 91 and the second connecting plate 92, the second connecting plate 92 of the front longitudinal link 9 is hinged to the front support 10. In the process that the first rotating member 14 rotates relative to the second rotating member 15 and drives the seat portion mounting plate 41 to ascend, the seat portion mounting plate 41 drives the front support 10 and the rear support 8 to ascend. Wherein the front support 10 drives the front longitudinal connecting rod 9 to rotate, and the rear support 8 drives the crank connecting piece 54 to rotate. During the rotation of the crank connecting member 54 and the front longitudinal connecting rod 9, the third transverse connecting rod 53 is driven to move forward, i.e. the backrest 51 is pulled to rotate, so that the backrest is in a backward-leaning position.

In the present embodiment, the first connecting plate 91 of the front longitudinal connecting rod 9 and the third connecting plate 541 of the crank connecting member 54 are both disposed in parallel with respect to the first rotating member 14. Referring to fig. 15 and 16, during the rotation process, the first connecting plate 91 of the front longitudinal connecting rod 9 and the third connecting plate 541 of the crank connecting piece 54 are always parallel to the first rotating member 14, so that the rotation angles of the three components are always consistent. Furthermore, the relative lifting height of the front support piece 10 and the rear support piece 8 is the same as the lifting height of the first rotating piece 14 relative to the second rotating piece 15, so that the seat mounting plate 41 integrally moves up and down in parallel, the seat mounting plate 41 does not have large fluctuation in the lifting process, and the comfort degree of a passenger is improved. And the front longitudinal connecting rod 9 and the crank connecting piece 54 are in a V-shaped structure, so that the distance between the second transverse connecting rod 52 and the bottom connecting rod 11 is shortened compared with a straight connecting rod, and the installation space is saved.

And the third transverse link 53 is provided with a second projection 531. Specifically, in this embodiment, the second protrusion 531 is a shaft head of the limiting shaft penetrating through the third transverse connecting rod 53. When the backrest 51 is in the reclined position, the second projection 531 abuts the side wall of the rear support 8. The second protrusion 531 abuts against the side wall of the rear support 8 to form a limit, so that the backrest 51 is prevented from falling downward continuously. Similarly, while preventing the backrest member 51 from falling downward continuously, the backrest drive link mechanism stops working and also provides a stroke limit for the seat mounting plate, so that the seat mounting plate can be lifted to a specified position.

On the contrary, when the motor mechanism 131 rotates reversely, the first rotating member 14 rotates reversely relative to the second rotating member 15 to drive the seat mounting plate 41 to descend. And the backrest drive linkage operates such that as the longitudinal spacing between the second transverse link 52 and the bottom link 11 decreases (i.e., as the backrest module 5 moves toward the extended position), the second transverse link 52 moves toward the backrest 51, pushing the third transverse link 53 to flip the backrest 51 relative to the seat mounting plate 41 until the mechanical extension unit 2 returns to the extended position.

Meanwhile, the front longitudinal connecting rod 9 is provided with a clamping groove 93 at the intersection of the first connecting plate 91 and the second connecting plate 92, the front supporting member 10 is provided with a supporting extension section inclined upwards towards the direction of the footrest assembly 3, and the supporting extension section is provided with a limiting member 101, in this scheme, the limiting member 101 is a cylindrical limiting member. Specifically, the columnar limiting block is a shaft head of a limiting shaft penetrating through the front supporting piece. When the mechanical stretching unit 2 is in the stretching position, the cylindrical limiting block abuts against the inner wall of the clamping groove 93. The front longitudinal connecting rod 9 is limited in stroke, so that the front longitudinal connecting rod 9 is prevented from rotating beyond the stroke, and the backrest 51 is prevented from excessively rotating beyond the preset point position of the extending position. Similarly, while preventing the backrest 51 from rotating excessively beyond the preset point where the seat is at the retracted position, the backrest driving link mechanism stops operating and also forms a stroke limit for the seat mounting plate 41, so that the seat mounting plate 41 can be lowered to a specified position; the second-stage adjustment of the mechanical extension unit 2 from the reclined position to the extended position is thereby restricted, but the second-stage adjustment from the extended position to the reclined position or the first-stage adjustment from the extended position to the stowed position may be performed.

Through the normal running fit of first rotation piece 14 and second rotation piece 15, back drive link mechanism drives preceding support piece 10 and back support piece 8 and goes up and down to drive seat mounting panel 41 and rise or descend and drive back 51 and rotate, overcome the transmission mode of the spout jack-up seat frame that generally utilizes on the market, its motion is steady, and the extension process links up no micro-pulsation perception consistently, has fabulous experience and feels, satisfies people to the comfortable demand of material more. Simultaneously foot bench subassembly 3 and back subassembly 5 are respectively through two link mechanism drives in this scheme, and its structure operation is also more stable, improves the comfort of user when the product uses. In addition, referring to fig. 12-15, in the present embodiment, the seat mounting plate 41, the first transverse link 6 and the second transverse link 52 are parallel to each other, so that they will not interfere with each other during the operation process, thereby ensuring the smooth operation of the mechanism. And the seat mounting plate 41, the first transverse link 6 and the second transverse link 52 are positioned at approximately the same height, so that the longitudinal height of the mechanical stretching unit 2 is greatly reduced, and the subsequent assembly of the power stretching device is facilitated.

In the present embodiment, the base 1 is provided with a supporting component 12 for supporting the mechanical extension unit 2. Specifically, the supporting assembly includes a supporting plate 121, the supporting plate 121 is connected to the base, and the supporting plate 121 is rotatably connected to the mechanical extension unit 2 through a plurality of links. More specifically, a linkage is hinged to the support plate 121, the linkage includes a plurality of support links 122, and the heads and the tails of two adjacent support links 122 are hinged to each other. Wherein, the supporting connecting rod 122 at the head end is hinged with the supporting plate 121, and the supporting connecting rod 122 at the tail end is fixedly connected with the bottom connecting rod 11. So that the support component 12 can rotate with the change of the form of the mechanical extension unit 2 to continuously support. Meanwhile, in this embodiment, the support link 122 at the rear end is rotatably connected to a bending link 123. As shown in fig. 10 and 15, the curved connecting rod 123 is divided into a first extending section 1231 and a second extending section 1232 along its length direction. Wherein the second extension 1232 is hinged to the support link 122, the second extension 1232 is bent along its length in a direction away from the bottom link 11, and the first extension 1232 is hinged to the rear longitudinal link 7. The support link 122 is driven by the bending link 123 to rotate along with the rotation of the rear longitudinal link 7, and the second extension 1231 is bent along its length to a direction away from the bottom link 11 to avoid interference with the bottom link 11. And the first extension 1231 is also bent along its length in a direction away from the mechanical extension unit 2. Interference of the first extension 1231 with the crank attachment 54 is avoided.

In the scheme, the hinging mode between the connecting rods adopts a bearing type kinematic pair of a column shaft and a bush. However, other prior art hinges may be used to ensure smooth operation of the extension device.

It should also be noted that the references to parallel in this embodiment are both substantially parallel, which may be the case where the two are substantially parallel, and which may allow for a small angular deflection between two parallel components. For example, an included angle of 1 to 3 degrees is formed between the two, so that the seat mounting plate 41 keeps the same posture when moving up and down in principle when driving.

Claims

1. A powered stretching device, comprising:

2. The powered extension device of claim 1, wherein: the transmission piece is a U-shaped transmission curved tube, an opening of the transmission curved tube is arranged towards the front, and the transmission curved tube is provided with a main body part perpendicular to the linear actuator and two connecting parts parallel to the mechanical extension unit; the two end parts of the main body part are positioned beside the two mechanical extension units, and the connecting part is connected with the end parts of the main body part; the power source is connected with the middle part of the main body part, and the connecting part is relatively and fixedly connected with the first transverse connecting rod through a right-angle connecting piece.

3. The powered extension device of claim 1, wherein: the power source is a motor mechanism, a slide rail which faces forwards is arranged on the motor mechanism, the moving module is a slide block arranged on the slide rail, and the slide block is driven by the motor mechanism to move along the slide rail.

4. The powered extension device of claim 1, wherein: the two ends of the driven curved tube are respectively connected with first rotating pieces in the two mechanical extension units, and the first rotating pieces are configured to be capable of driving the cushion support assembly and the backrest assembly to be adjusted between the extension position and the reclining position when rotating relative to the base.

5. The powered extension device of claim 4, wherein: the cushion support assembly includes a seat mounting plate, the back assembly including a back member, a back drive linkage for moving the back assembly between an extended position and a reclined position, the back member being pivotally coupled to the seat mounting plate, the back drive linkage including a bottom link fixedly connected to a base, the bottom link being positioned below and relatively parallel to the seat mounting plate; the first rotating piece is rotatably connected to the middle part of the seat part mounting plate, the middle part of the bottom connecting rod is hinged with a second rotating piece, and the first rotating piece is rotatably connected with the second rotating piece; the first rotating piece rotates along with the driven curved tube relative to the second rotating piece to drive the seat mounting plate to be far away from or close to the bottom connecting rod; the backrest driving connecting rod mechanism further comprises two crank connecting rods which are respectively and rotatably connected to the head end and the tail end of the bottom connecting rod, each crank connecting rod comprises two branches, a front supporting piece and a rear supporting piece are respectively hinged to one branch of each of the two crank connecting rods, the front supporting piece and the rear supporting piece are respectively connected with the head end and the tail end of the seat mounting plate and used for driving the two crank connecting rods to rotate when the seat mounting plate is far away from or close to the bottom connecting rod, and then the backrest driving connecting rod mechanism is triggered to drive the backrest assembly to move between an extending position and a backward bending position; the other branch of each of the two crank links is always parallel to the first rotating member during movement of the backrest assembly between the extended position and the reclined position.

6. The powered extension device of claim 5, wherein: the backrest driving connecting rod mechanism further comprises a second transverse connecting rod located on one side of the seat mounting plate, the tail end of the second transverse connecting rod is rotatably connected with the backrest part, the front end of the second transverse connecting rod is hinged with a front longitudinal connecting rod, the front longitudinal connecting rod is a crank connecting rod located at the head end of the bottom connecting rod, two branches of the front longitudinal connecting rod are respectively a first connecting plate and a second connecting plate, the first connecting plate and the second connecting plate are arranged in a crossed mode to form a V-shaped structure, the bottom connecting rod is hinged with the intersection of the front longitudinal connecting rod and the first connecting plate, the first connecting plate is hinged with the second transverse connecting rod, the second connecting plate is hinged with the front supporting part, and the first connecting plate is parallel with the first rotating part all the time.

7. The powered extension device of claim 6, wherein: the front longitudinal connecting rod is provided with a clamping groove at the intersection of the first connecting plate and the second connecting plate, the front supporting piece is provided with a limiting piece, and the limiting piece is abutted against the inner wall of the clamping groove when the backrest piece is at a folding position, a stretching position and a position between the folding position and the stretching position.

8. The powered extension device of claim 6, wherein: the backrest component further comprises a third transverse connecting rod and a crank connecting piece, the tail end of the third transverse connecting rod is hinged to the tail end of the backrest component, the middle portion of the third transverse connecting rod is hinged to the tail end of the second transverse connecting rod, the crank connecting piece is a crank connecting rod located at the tail end of the bottom connecting rod, two branches of the crank connecting piece are respectively a third connecting plate and a fourth connecting plate, the third connecting plate and the fourth connecting plate are arranged in a crossed mode to form a V-shaped structure, the third connecting plate is hinged to the head end of the third transverse connecting rod, the bottom connecting rod is connected with the crank connecting piece at the intersection of the third connecting plate and the fourth connecting plate, the fourth connecting plate is hinged to the rear supporting piece, and the third connecting plate is always parallel to the first rotating piece.

9. The powered extension device of claim 8, wherein: and a second bulge is arranged on the third transverse connecting rod, and when the backrest part is in a backward leaning position, the second bulge is abutted against the side wall of the rear supporting part.

10. The powered extension device of claim 5, wherein: first transverse connecting rod parallel arrangement is in one side of seat mounting panel, first transverse connecting rod rotationally couples the first ottoman connecting rod in the ottoman subassembly, the ottoman subassembly still includes the second ottoman connecting rod, the tail end of first ottoman connecting rod, the tail end of second ottoman connecting rod and the seat mounting panel is articulated, the tail end of first transverse connecting rod articulates there is back longitudinal rod, back longitudinal rod pass through back support piece with the seat mounting panel is articulated, seat mounting panel, first ottoman connecting rod, second ottoman connecting rod, first transverse connecting rod, back longitudinal rod and back support piece constitute ottoman link mechanism and are used for driving the ottoman subassembly moves between draw in position and extension position for the seat mounting panel.

11. The powered extension device of claim 10, wherein: the base is provided with a supporting component for supporting the mechanical extension unit; the supporting component comprises a supporting plate, the supporting plate is connected with the base, a connecting rod set is hinged to the supporting plate and comprises a plurality of supporting connecting rods, the heads and the tails of two adjacent supporting connecting rods are hinged to each other, the supporting connecting rods located at the head ends are hinged to the supporting plate, and the supporting connecting rods located at the tail ends are fixedly connected with the bottom connecting rod.

12. The powered extension device of claim 11, wherein: the support connecting rod that is located the tail end on rotatable coupling have crooked connecting rod, divide into first extension section and second extension section along self length direction on the crooked connecting rod, the second extension section is articulated with the support connecting rod, and just first extension section is crooked to the direction of keeping away from the bottom connecting rod along self length, first extension section is articulated with back longitudinal rod.