CN212630322U - Mechanical stretching unit and mechanical stretching device - Google Patents

Abstract

The utility model discloses a mechanical stretching unit and mechanical stretching device, the mechanical stretching unit includes footrest subassembly, cushion supporting component and back subassembly, the cushion supporting component includes the seat mounting panel, through being provided with the back supporting connecting rod, the first bench connecting rod that collapses, the second bench connecting rod that collapses, the first transverse connecting rod, the first longitudinal connecting rod and seat mounting panel constitute first link mechanism and be used for driving the footrest subassembly to move between drawing in the position and the extension position relative to the seat mounting panel; the backrest component comprises a backrest piece and a second transverse connecting rod, the second transverse connecting rod is arranged on one side of the first transverse connecting rod in parallel, and a second connecting rod mechanism is formed by the front longitudinal connecting rod, the bottom connecting rod, the rear longitudinal connecting rod and the second transverse connecting rod and is used for driving the backrest component to move between a depending position and a backward leaning position. The footrest component and the backrest component are respectively driven by the two groups of link mechanisms, the movement is stable, and the extension process is continuous.

Description

Mechanical stretching unit and mechanical 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 mechanical stretching unit and mechanical 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' 201110021296.1 patent teaches a linkage mechanism and a seating unit that allows the seating unit to recline or fold by means of a channel and a sequential element that extends into the channel, which allows the state of the seating unit to change by sliding the sequential element within the channel. However, the following problems still remain as described above;

the seat unit can be forcibly extended, lifted and closed only by the sliding long groove; thereby make the extension device in the function, can not make the movement track of product accomplish smoothly, because of the space clearance of spout, lead to the user when leaning on the back, the state of beating or displacement can appear, and to a great extent has reduced user's experience and has felt.

And in the process of folding or extending the backrest, the plate where the sliding groove is located relatively moves upwards or downwards to drive the component for supporting the cushion to rotate, and because the matching motion track of the sliding groove and the component is not smooth enough, the problem of jumping or displacement can also occur in the rotating process of the component for supporting the cushion.

Disclosure of Invention

In order to solve the technical problem, the utility model aims at providing a mechanical extension unit through two sets of link mechanism drive foot bench subassembly and back subassembly respectively, its motion is steady, and the extension process links up no trace perception of beating, has fabulous experience and feels, satisfies people more to using comfortable demand.

Solve the technical problem, the utility model discloses take following technical scheme:

a mechanical stretching unit comprising: the seat cushion supporting assembly comprises a seat mounting plate, a first transverse connecting rod parallel to the seat mounting plate is arranged on one side of the seat mounting plate and rotatably connected to a first stool collapsing connecting rod in the foot stool assembly, the tail end of the first stool collapsing connecting rod and the tail end of a second stool collapsing connecting rod in the foot stool assembly are hinged to the seat mounting plate, the tail end of the first transverse connecting rod is hinged to a rear longitudinal connecting rod, the rear longitudinal connecting rod is hinged to the seat mounting plate through a rear supporting connecting rod, and the seat mounting plate, the first stool collapsing connecting rod, the second stool collapsing connecting rod, the first transverse connecting rod, the rear longitudinal connecting rod and the rear supporting connecting rod form a first connecting rod mechanism for driving the foot stool assembly to move between a folding position and an extending position relative to the seat mounting plate; the backrest component comprises a backrest piece and a second transverse connecting rod, the second transverse connecting rod is arranged on one side of the first transverse connecting rod in parallel, the backrest piece is pivotally connected to the seat mounting plate, the tail end of the second transverse connecting rod is rotatably connected with the backrest piece, the front end of the second transverse connecting rod is hinged to a front longitudinal connecting rod, the middle of the front longitudinal connecting rod is hinged to a bottom connecting rod, the bottom connecting rod is hinged to a second rear longitudinal connecting rod, the second rear longitudinal connecting rod is connected with the second transverse connecting rod, and the second transverse connecting rod, the front longitudinal connecting rod, the bottom connecting rod and the second rear longitudinal connecting rod form a second connecting rod mechanism for driving the backrest component to move between a folding position and a reclining position; and the tail end of the front longitudinal connecting rod is provided with a front supporting piece, and the front supporting piece is connected with the seat mounting plate and used for driving the seat mounting plate to ascend or descend when the front longitudinal connecting rod rotates.

In a further scheme, the front longitudinal connecting rod comprises 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 and the front longitudinal connecting rod are hinged to the meeting position of the first connecting plate and the second connecting plate, the first connecting plate is hinged to the second transverse connecting rod, and the second connecting plate is hinged to the front supporting piece.

In a further scheme, 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 part is arranged on the front supporting part, and when the backrest is located at the folding position, the limiting part abuts against the inner wall of the clamping groove to prevent the backrest from excessively rotating to exceed the preset position where the folding position is located.

In a further aspect, the first linkage is connected to the second linkage; the backrest part drives the second connecting rod mechanism to contract when moving to the backward leaning position; when the second connecting rod mechanism is contracted, the second transverse connecting rod approaches to the bottom connecting rod; and the second link mechanism presses the first link mechanism to contract when doing contraction action.

In a further scheme, the backrest assembly further comprises a third transverse connecting rod and a crank connecting piece, two ends of the third transverse connecting rod are hinged to the backrest piece and the second transverse connecting rod respectively, the head end of the crank connecting piece is hinged to the third transverse connecting rod, the tail end of the crank connecting piece is rotatably connected with the bottom connecting rod, a first bulge is arranged on the crank connecting piece and abuts against the side wall of the rear longitudinal connecting rod, and when the second connecting rod mechanism contracts, the first bulge presses the side wall of the rear longitudinal connecting rod.

In a further scheme, the crank connecting piece comprises 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 third transverse connecting rod, the fourth connecting plate is hinged to the rear supporting connecting rod, and the rear longitudinal connecting rod is hinged to the crank connecting piece at the intersection of the third connecting plate and the fourth connecting plate.

In a further scheme, a second protrusion is arranged on the third transverse connecting rod, and when the backrest is located at the backward leaning position, the second protrusion abuts against the side wall of the rear supporting connecting rod. The lateral wall through second arch and back supporting connection rod offsets and forms spacingly, prevents that the back support from continuously bending backward the whereabouts.

The utility model discloses provide a mechanical extension device simultaneously, mechanical extension unit in base and two above-mentioned schemes, two mechanical extension units are mirror symmetry setting on the base, the bottom connecting rod all with base fixed connection.

In a further aspect, a plurality of support tubes are disposed between the two mechanical extension units. The overall stability of the device is improved by a plurality of support tubes.

In a further scheme, two ends of at least one support tube in the plurality of support tubes are respectively connected with the front longitudinal connecting rods in the two mechanical extension units, so that the second connecting rod mechanisms on two sides can be ensured to synchronously operate, and the bottom mounting plate can be lifted more stably.

In a further scheme, a supporting component for supporting the mechanical extension unit is arranged on the base, so that the mechanical extension unit is supported, and the stability of the structure is improved.

In a further scheme, the supporting component includes the backup pad, the backup pad with the base is connected, just it has the linkage to articulate in the backup pad, the linkage includes many supporting connecting rods, and the end to end of two adjacent supporting connecting rods is articulated each other, the supporting connecting rod that is located the head end with the backup pad is articulated, and the supporting connecting rod that is located the tail end is connected with bottom connecting rod fixed connection. So that the supporting component can rotate along with the change of the shape of the mechanical stretching unit to continuously support.

In a further scheme, a bent connecting rod is rotatably connected to the supporting connecting rod at the tail end, 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 to the supporting 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 to the rear longitudinal connecting rod to avoid interference with the bottom connecting rod.

In a further aspect, the second extension is bent along its length in a direction away from the mechanical extension unit to avoid interference with the crank connection.

Advantageous effects

1. The footstool component is driven by the connecting rod component formed by the connecting rods, the motion is stable, the stretching process is coherent without micro-bounce perception, the footstool component has excellent experience feeling, and the requirement of people for comfort of materials is met.

2. The seat mounting plate is driven to ascend or descend by the second connecting rod, the transmission mode that the seat frame is jacked up by the sliding groove 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.

3. The footrest assembly is driven to move between a folded position and an extended position relative to the seat mounting plate through a first transverse connecting rod; the second linkage drives the backrest assembly to move between a stowed position and a reclined position. The footrest assembly and the backrest assembly are driven by the two link mechanisms respectively, and the structure operation is more stable.

4. The first transverse connecting rod is located on one side of the seat mounting plate, and the second transverse connecting rod is located on one side of the first transverse connecting rod, so that the heights of the seat mounting plate, the first transverse connecting rod and the second transverse connecting rod are approximately consistent, the longitudinal height of the mechanical stretching unit is greatly reduced, and subsequent assembly is facilitated.

Drawings

FIG. 1 is a schematic view of a mechanical stretching apparatus;

FIG. 2 is a schematic view of the mechanical extension unit with the footrest assembly in a stowed position and the backrest assembly in a stowed position;

FIG. 3 is a schematic view of the mechanical extension unit with the footrest assembly in an extended position and the backrest assembly in a reclined position;

FIG. 4 is a schematic illustration of the footrest assembly and the first link mechanism with the footrest assembly in the collapsed position;

FIG. 5 is a schematic illustration of the footrest assembly and the first linkage mechanism with the footrest assembly in the extended position;

fig. 6 is a schematic structural view of the backrest assembly and the second link mechanism when the backrest assembly is in the folded position;

FIG. 7 is a schematic view of the backrest assembly and the second linkage mechanism with the backrest assembly in a reclined position;

FIG. 8 is a schematic view of the front longitudinal link;

FIG. 9 is a schematic structural view of a crank attachment;

FIG. 10 is a schematic view of a curved link;

FIG. 11 is a schematic view of the backrest;

FIG. 12 is a schematic three-dimensional view of the mechanical extension unit when the footrest assembly is in the stowed position and the backrest assembly is in the stowed position;

FIG. 13 is a schematic view of the mechanical extension unit at another angle with the footrest assembly in the stowed position and the backrest assembly in the stowed position;

FIG. 14 is a schematic three-dimensional view of the mechanical extension unit when the footrest assembly is in the extended position and the backrest assembly is in the stowed position;

fig. 15 is a three-dimensional schematic view of the mechanical extension unit when the footrest assembly is in the extended position and the backrest assembly is in the reclined position.

The reference numerals in the schematic drawings illustrate:

1-base, 2-mechanical extension unit, 3-footrest assembly, 31-footrest, 32-first bench-collapsing link, 33-second bench-collapsing link, 34-third bench-collapsing link, 35-fourth bench-collapsing link, 4-cushion-supporting assembly, 41-seat-mounting plate, 5-backrest assembly, 51-backrest, 511-backrest-insertion section, 512-connection section, 52-second transverse link, 53-third transverse link, 531-second projection, 54-crank-connection, 541-third connection plate, 542-fourth connection plate, 543-first projection, 6-first transverse link, 7-rear longitudinal link, 71-limiting groove, 8-rear supporting link, 9-front longitudinal link, 91-first connection plate, 92-second connecting plate, 93-clamping groove, 10-front support, 101-stop, 11-bottom link, 12-support component, 121-support plate, 122-support link, 123-bending link, 1231-first extension, 1232-second extension, 13-drive component, 131-first drive link, 1311-groove, 132-second drive link, 1321-third protrusion, 133-rotation shaft, 134-spring, 14-support tube.

Detailed Description

For a further understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1-15, the present embodiment provides a mechanical stretching apparatus, which includes a base 1 and two mechanical stretching units 2, wherein the two mechanical stretching units 2 are disposed on the base 1 in a mirror symmetry manner. In the present embodiment, each mechanical extension unit 2 includes a footrest assembly 3, a cushion support assembly 4, and a backrest assembly 5. The footrest assembly 3 comprises a footrest 31, a third stool collapsing connecting rod 34 and a fourth stool collapsing connecting rod 35 are connected to the footrest 31, the third stool collapsing connecting rod 34 and the fourth stool collapsing connecting rod 35 are parallel to each other, a first stool collapsing connecting rod 32 is hinged to the third stool collapsing connecting rod 34, a second stool collapsing connecting rod 33 is hinged to the fourth stool collapsing connecting rod 35, the first stool collapsing connecting rod 32 and the second stool collapsing connecting rod 33 are parallel to each other, and the second stool collapsing connecting rod 33 and the third stool collapsing connecting rod 34 are crossed and hinged at the crossed position.

The cushion support assembly 4 comprises a seat mounting plate 41, one side of the seat mounting plate 41 being provided with a first transverse link 6 parallel to the seat mounting plate 41. The head end of the first transverse link 6 is rotatably coupled to the first bench collapsing link 32, and the tail end of the first bench collapsing link 32 (i.e., the end away from the footrest 31), and the tail end of the second bench collapsing link 33 are both hinged to the seat mounting plate 41.

And the tail end (i.e. the end far away from the footrest 31) of the first transverse connecting rod 6 is hinged with a rear longitudinal connecting rod 7, the middle part of the rear longitudinal connecting rod 7 is hinged with a crank connecting piece 54, and 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 the rear support link 8. The crank attachment 54 is connected to the seat mounting plate 41 by the rear support link 8. Specifically, the rear end of the rear support link 8 (i.e., the end away from the backrest 51) is hinged to the fourth connecting plate 542 of the crank connector 54, and the head end of the rear support link 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 bench collapsing link 32 and the second bench collapsing link 33 form a bench collapsing link group, and a self-locking closed-loop first link mechanism in a substantially quadrilateral shape is formed by the seat mounting plate 41, the bench collapsing link group, the first transverse link 6, the rear longitudinal link 7, the crank connecting member 54 and the rear support link 8, so as to drive the footrest assembly 3 to move between a folded position and an extended position relative to the seat mounting plate 41.

When the first link mechanism operates and the first transverse link 6 moves towards the footrest 31, as shown in fig. 5, the first transverse link 6 pushes the first stool collapsing link 32 to rotate, the first stool collapsing link 32 drives the third stool collapsing link 34 to lift up the footrest 31, and further drives the fourth stool collapsing link 35 and the second stool collapsing link 33 to rotate until the footrest 31 is in the extended position.

On the contrary, when the first link mechanism operates to drive the first transverse link 6 to move towards the direction away from the footrest 31, the first transverse link 6 pulls the first stool collapsing link 32 to rotate, and the first stool collapsing link 32 drives the third stool collapsing link 34 to be brought back to the footrest 31, so as to realize the contraction of the footrest assembly 3. The connecting rod assemblies are formed by the connecting rods to realize driving, the movement of the connecting rod assemblies is stable, the stretching process is coherent, no micro-bounce perception exists, the experience feeling is excellent, and the comfort level of a product is improved.

Meanwhile, in the present embodiment, the backrest module 5 includes a backrest 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 far away from 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 a third connecting plate 541 of the crank connecting piece 54 is hinged with a third transverse connecting rod 53. And as described in the above-mentioned first link mechanism, the fourth connecting plate 542 of the crank connector 54 is further hinged to the rear support link 8, and the crank connector 54 is connected to the seat mounting plate 41 through the rear support link 8. Specifically, the tail end of the rear support link 8 is hinged to the crank connector 54, and the head end of the rear support link 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 third transverse connecting rod 53, the second transverse connecting rod 52, the front longitudinal connecting rod 9, the bottom connecting rod 11, the rear longitudinal connecting rod 7 and the crank connecting piece 54 form a second connecting rod mechanism for driving the backrest assembly 5 to move between the folding position and the reclining position.

When the second linkage is operated (i.e., the backrest module 5 is moved 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. And a front supporting piece 10 is arranged on the tail end of the front longitudinal connecting rod 9 in the scheme.

Referring to fig. 8, the front longitudinal link 9 includes 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 when the second link mechanism operates, the longitudinal distance between the second transverse link 52 and the bottom link 11 increases, and in the process, the front longitudinal link 9 is turned over. Because the front longitudinal connecting rod 9 is hinged to the bottom connecting rod 11 at the intersection of the first connecting plate 91 and the second connecting plate 92, and the second connecting plate 92 of the front longitudinal connecting rod 9 is hinged to the front supporting piece 10, in the process of overturning the front longitudinal connecting rod 9, the front longitudinal connecting rod 9 jacks the front supporting piece 10, so as to raise the height of the seat mounting plate 41, and achieve the purpose of driving the seat mounting plate 41 to rise. And the front longitudinal connecting rod 9 is 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.

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 backrest 51 is in the retracted position, the cylindrical stopper abuts against the inner wall of the engaging 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 folding position.

Conversely, when the second linkage operates such that the longitudinal distance between the second transverse link 52 and the bottom link 11 decreases (i.e., the backrest module 5 moves to the folded position), the second transverse link 52 moves toward the backrest 51, and pushes the third transverse link 53 to turn the backrest 51 relative to the seat mounting plate 41 until the backrest 51 is in the folded position. In the process, the front longitudinal connecting rod 9 is turned over, the front longitudinal connecting rod 9 drives the front supporting piece 10 to descend, and then the height of the seat mounting plate 41 is reduced, so that the purpose of driving the seat mounting plate 41 to descend is achieved.

The seat mounting plate 41 is driven to ascend or descend by the second connecting rod mechanism, the transmission mode of pushing up the seat frame by the sliding groove 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. The footrest component 3 and the backrest component 5 are driven by two link mechanisms respectively, the structure operation is more stable, and the comfort of the user is improved when the product is used. Meanwhile, 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 stable operation of the mechanism. And the seat mounting plate 41, the first transverse link 6 and the second transverse link 52 are located 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 mechanical stretching device is facilitated.

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 link 8. The second protrusion 531 abuts against the side wall of the rear support link 8 to form a limit position, so that the backrest 51 is prevented from continuously falling backwards.

In addition, the crank connecting element 54 is provided with a first protrusion 543 on the third connecting plate 541. Specifically, in this embodiment, the first protrusion 543 is a shaft head of the limiting shaft penetrating through the third connecting plate 541. The first protrusion 543 abuts against the side wall of the rear longitudinal link 7 when the footrest assembly 3 is in the folded position and the backrest assembly 5 is in the folded position.

In order to avoid the dislocation of the first protrusion 543 and the rear longitudinal connecting rod 7, the rear longitudinal connecting rod 7 is provided with a limiting groove 71, and the first protrusion 543 abuts against the groove wall of the limiting groove 71 when the footrest assembly 3 is in the folded position and the backrest assembly 5 is in the folded position. When the second link mechanism contracts (i.e. the second transverse link 52 approaches the bottom link 11), the first protrusion 543 presses the sidewall of the rear longitudinal link 7, pushing the rear longitudinal link 7 to rotate, and then driving the first link mechanism to operate. When the first link mechanism is retracted (i.e. the first transverse link 6 moves towards the footrest 31), the first transverse link 6 pushes the first stool collapsing link 32 to rotate, the first stool collapsing link 32 drives the third stool collapsing link 34 to lift the footrest 31, and further drives the fourth stool collapsing link 35 and the second stool collapsing link 33 to rotate until the footrest 31 is in the extended position.

In this embodiment, the mechanical extension unit 2 is further provided with a driving assembly 13 for driving the first link mechanism to operate. The driving assembly 13 includes a spring 134, a first driving link 131 and a second driving link 132, the first stool collapsing link 32 is hinged to a head end of the first driving link 131, and a tail end of the first driving link 131 is hinged to a head end of the second driving link 132. The rear end of the second driving link 132 is rotatably connected to the seat mounting plate 41, and specifically, the rear end of the second driving link 132 is provided with a through hole, the seat mounting plate 41 is provided with a rotating shaft 133, and the rotating shaft 133 passes through the through hole, so that the second driving link 132 can rotate around the rotating shaft 133. And both ends of the spring 134 are connected to the first driving link 131 and the seat mounting plate 41, respectively. When the footrest assembly 3 is in the stowed position, the first and second drive links 131, 132 are folded relatively close together. The second driving link 132 is provided with a third protrusion 1321, the first driving link 131 is provided with a groove 1311, the third protrusion 1321 is clamped in the groove 1311, and the spring 134 is in a stretching state. The spring 134 gives the first driving link 131 a restoring force, but the spring 134, the third protrusion 1321 and the groove wall of the groove 1311 are located on the same straight line, and the restoring force forces the third protrusion 1321 to abut against the groove wall of the groove 1311, so that the first driving link 131 and the second driving link 132 cannot be restored. When the footrest assembly 3 is required to be in the extended position, the second driving link 132 and the first driving link 131 only need to be rotated downward, so that the third protrusion 1321 is separated from the groove 1311, the spring 134 automatically drives the first driving link 131 to return, and the first stool collapsing link 32 is lifted up, so that the footrest assembly 3 is in the extended position.

In addition, a plurality of supporting pipes 14 for improving the stability of the device and for driving the two mechanical stretching units 2 to synchronously move are arranged between the two mechanical stretching units 2, and two ends of the supporting pipes 14 are respectively connected with the two mechanical stretching units 2. And as a preferred embodiment, two ends of at least one support tube 14 in the plurality of support tubes 14 are respectively connected with the front longitudinal connecting rods 9 in the two mechanical extension units, so that the synchronous operation of the second connecting rod mechanisms at two sides is ensured, and the lifting of the bottom mounting plate is more stable.

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.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims (12)

1. A mechanical stretching unit, comprising: the seat cushion supporting assembly comprises a seat mounting plate, a first transverse connecting rod parallel to the seat mounting plate is arranged on one side of the seat mounting plate and rotatably connected to a first stool collapsing connecting rod in the foot stool assembly, the tail end of the first stool collapsing connecting rod and the tail end of a second stool collapsing connecting rod in the foot stool assembly are hinged to the seat mounting plate, the tail end of the first transverse connecting rod is hinged to a rear longitudinal connecting rod, the rear longitudinal connecting rod is hinged to the seat mounting plate through a rear supporting connecting rod, and the seat mounting plate, the first stool collapsing connecting rod, the second stool collapsing connecting rod, the first transverse connecting rod, the rear longitudinal connecting rod and the rear supporting connecting rod form a first connecting rod mechanism for driving the foot stool assembly to move between a folding position and an extending position relative to the seat mounting plate; the backrest component comprises a backrest piece and a second transverse connecting rod, the second transverse connecting rod is arranged on one side of the first transverse connecting rod in parallel, the backrest piece is pivotally connected to the seat mounting plate, the tail end of the second transverse connecting rod is rotatably connected with the backrest piece, the front end of the second transverse connecting rod is hinged to a front longitudinal connecting rod, the middle of the front longitudinal connecting rod is hinged to a bottom connecting rod, the bottom connecting rod is hinged to a rear longitudinal connecting rod, the rear longitudinal connecting rod is connected with the second transverse connecting rod, and the second transverse connecting rod, the front longitudinal connecting rod, the bottom connecting rod and the rear longitudinal connecting rod form a second connecting rod mechanism for driving the backrest component to move between a folding position and a reclining position; and the tail end of the front longitudinal connecting rod is provided with a front supporting piece, and the front supporting piece is connected with the seat mounting plate and used for driving the seat mounting plate to ascend or descend when the front longitudinal connecting rod rotates.

2. The mechanical extension unit of claim 1, wherein the front longitudinal link includes a first link plate and a second link plate arranged to intersect to form a V-shaped configuration, the bottom link and the front longitudinal link are hinged at the intersection of the first link plate and the second link plate, the first link plate is hinged to the second transverse link, and the second link plate is hinged to the front support.

3. The mechanical spreader unit of claim 2, wherein the front longitudinal link has a slot at the intersection of the first connecting plate and the second connecting plate, the front support has a stop member, and the stop member abuts against the inner wall of the slot when the backrest is in the retracted position.

4. The mechanical extension unit of claim 1, wherein the first linkage is coupled to the second linkage; the backrest part drives the second connecting rod mechanism to contract when moving to the backward leaning position; when the second connecting rod mechanism is contracted, the second transverse connecting rod approaches to the bottom connecting rod; and the second link mechanism presses the first link mechanism to contract when doing contraction action.

5. The mechanical extension unit of claim 4, wherein the backrest assembly further comprises a third transverse connecting rod and a crank connecting member, two ends of the third transverse connecting rod are respectively hinged to the backrest member and the second transverse connecting rod, a head end of the crank connecting member is hinged to the third transverse connecting rod, a tail end of the crank connecting member is rotatably connected to the bottom connecting rod, a first protrusion is disposed on the crank connecting member and abuts against a side wall of the rear longitudinal connecting rod, and when the second connecting rod mechanism performs a retracting action, the first protrusion presses the side wall of the rear longitudinal connecting rod.

6. The mechanical extension unit of claim 5, wherein the crank connector includes a third connecting plate and a fourth connecting plate, the third connecting plate and the fourth connecting plate are arranged to intersect to form a V-shaped structure, the third connecting plate is hinged to the third transverse link, the fourth connecting plate is hinged to the rear support link, and the rear longitudinal link is hinged to the crank connector at the intersection of the third connecting plate and the fourth connecting plate.

7. A mechanical extension unit according to claim 5, wherein the third transverse link is provided with a second projection which abuts against a side wall of the rear support link when the backrest is in the reclined position.

8. A mechanical stretching apparatus, comprising a base and two mechanical stretching units as claimed in any one of claims 1 to 6, wherein the two mechanical stretching units are arranged on the base in mirror symmetry, and the bottom connecting rod is fixedly connected with the base.

9. The mechanical stretching device of claim 8, wherein a plurality of support tubes are disposed between the two mechanical stretching units; two ends of at least one of the support tubes are respectively connected with the front longitudinal connecting rods in the two mechanical extension units.

10. The mechanical stretching apparatus of claim 8, wherein a support assembly for supporting the mechanical stretching unit is provided on the base; 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.

11. The mechanical stretching device as claimed in claim 10, wherein a bending link is rotatably connected to the supporting link at the rear end, the bending link is divided into a first extending section and a second extending section along its length direction, the second extending section is hinged to the supporting link, the first extending section is bent along its length direction away from the bottom link, and the first extending section is hinged to the rear longitudinal link.

12. The mechanical stretching apparatus of claim 11 wherein said second extension is curved along its length in a direction away from said mechanical stretching unit.

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