CN113040556A

CN113040556A - Back linkage mechanism for sofa

Info

Publication number: CN113040556A
Application number: CN201911375440.4A
Authority: CN
Inventors: 叶琦琦; 毕大岩; 陆建忠; 褚炳彬
Original assignee: Kuka Home Co Ltd
Current assignee: Kuka Home Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-06-29

Abstract

The invention relates to a back linkage mechanism for a sofa; the back linkage mechanism is characterized in that a connecting rod assembly forming the back linkage mechanism comprises a plurality of rod bodies which are mutually and rotationally connected end to end and a backrest mounting seat which is arranged on one of the rod bodies, rotationally connected with the other connecting rod through the other auxiliary connecting rod and fixed above the rod bodies; the rod bodies which are mutually connected in a head-to-tail rotating way are in a folding state of being sequentially stacked when the sofa is in a sitting posture, and are in a half-extending or full-extending unfolding state when the sofa is in a TV posture or a lying posture respectively. The sofa has the advantages that the back mechanism is designed into a transverse stacking structure and a motion track, so that the space is saved, and the feeling that a user is extruded when the posture of the sofa is changed is avoided; the use comfort of the user is improved.

Description

Back linkage mechanism for sofa

Technical Field

The invention relates to a back mechanism for a sofa; in particular to a foldable back mechanism for improving the use comfort of a movable seat or a deformable sofa and further reducing the volume of a backrest framework of the foldable back mechanism.

Background

In general, a movable seat or a convertible sofa (hereinafter referred to as a sofa) has a frame made of a plurality of rigid members such as link assemblies or plates that can rotate or move relative to each other. When the framework is changed into the posture, the flexible covering wrapped outside the framework is inevitably squeezed, and meanwhile, the squeezing of the flexible covering is also changed into the squeezing of the user, and the use feeling of the user can be influenced.

The above drawbacks are more likely to occur, in particular, during the use of the transformable or functional sofa. Currently, for functional sofas, there are generally three recognized postures that can be mutually rotated: namely a sitting position, a TV position and an extended position (also called a lying position). The mutual rotation of the different postures is realized by the posture conversion of the framework of the sofa. For the framework of such sofas, the following modules are generally included: 1. seat frame mechanism, 2, hang translation mechanism, 3, back mechanism, 4, leg rest mechanism. In the sitting posture, the modules of the sofa framework are in the furled state, and the sofa is in the state of a common sofa, so that the sitting posture requirement of a user is met. The posture of the TV is distinguished from the sitting position in that the leg rest mechanism at the lower part of the sofa is converted into a deployed state and provides sufficient support for the user's legs, while the back mechanism at the rear part of the sofa remains stationary or slightly topples over, so that the user's need to lie half is met. The lying position is that the back mechanism is further inclined in the state of the TV position, and other mechanisms of the sofa, such as a seat frame mechanism and the like, are correspondingly changed in posture through the suspension translation mechanism, so that the whole sofa framework is finally in a nearly horizontal state. Therefore, in the process of changing any posture of the functional sofa, the backrest mechanism always participates in the deformation process and makes a large posture change. In this case, if the rigid link constituting the backrest mechanism is pressed against the flexible cover, it is highly likely to be felt by the user, and thus, to be transformed into a pressing against the user, so that the comfort of the user is lowered.

Generally, to avoid the above problems, the option is to reserve sufficient space for movement of the backrest mechanism. In order to achieve the purpose of leaving space, the depth of the sofa cushion (i.e. the seat board with the flexible covering) is often reduced, and meanwhile, the inward bending measures are taken at the triangular junctions between the cushion and the backrest and between the cushion and the armrests, which undoubtedly also affect the sitting feeling of the user. Also, reducing the usable area of the sofa cushion is only a surface visible measure. Particularly, for the modification of the sofa inner frame, in order to leave enough space for the back mechanism, the thickness of the whole back mechanism and even the suspension translation mechanism and the gap between the back mechanism and the suspension translation mechanism have to be widened, and the direct influence is that the volume of the sofa frame becomes larger. Clearly, this will make the entire sofa appear to become bulky.

Disclosure of Invention

The aim of the invention is to overcome the above-mentioned drawbacks, namely that the invention aims at reducing the space required by the back mechanism during movement, or that the invention aims at reducing the volume of the back mechanism so that it becomes as thin as possible and that during movement it bends as far inward and downward as possible, rather than outward or in an expanded position.

In order to achieve the above object, the present invention is realized by:

a back linkage for a sofa comprising at least a seat frame support mechanism 101, a suspension translation mechanism 102 and a back linkage 103; the back linkage mechanism 103 is a connecting rod assembly which has a driven relationship with each other and is rotatably connected with each other, and at least one connecting rod in the connecting rod assembly is rotatably connected with the suspension translation mechanism 102; when the suspension translation mechanism 102 is subjected to posture conversion, the back linkage mechanism 103 also makes corresponding posture conversion; the link assembly constituting the back linkage 103 includes a plurality of link bodies rotatably connected end to end and a back mount 1034 disposed on one of the link bodies and rotatably connected to the other link through the other auxiliary link to be fixed above the link bodies; the rod bodies which are mutually connected in a head-to-tail rotating way are in a folding state of being sequentially stacked when the sofa is in a sitting posture, and are in a half-extending or full-extending unfolding state when the sofa is in a TV posture or a lying posture respectively.

The back linkage mechanism for the sofa comprises a connecting rod assembly of the back linkage mechanism 103, wherein one end of the connecting rod assembly is rotatably connected with the suspension translation mechanism 102 and transmits pushing force or pulling force to a subsequent adjacent connecting rod, the other end of the first connecting rod 1031 is connected with one end of an intermediate connecting rod 1032, the other end of the intermediate connecting rod 1032 is rotatably connected with one end of a second connecting rod 1033, the other end of the second connecting rod 1033 is connected with one end of a backrest mounting seat 1034, the other end of the backrest mounting seat 1034 is rotatably connected with an auxiliary connecting rod 1035, and the other end of the auxiliary connecting rod 1035 is rotatably connected with the middle part of the intermediate connecting rod 1032; thus, when the suspension translation mechanism 102 and the seat frame 101 change the posture, the first link 1031 is rotated around the rotation point by the pushing or pulling force of the suspension translation mechanism 102, so as to sequentially drive the middle link 1032, the second link 1033, and the auxiliary link 1035 to rotate correspondingly, and at this time, the backrest mounting seat 1034 also makes a corresponding posture change under the action of the second link 1033 and the auxiliary link 1035.

The back mechanism for the sofa realizes the purpose of controlling the action sequence of the backrest mounting seat 1034 in the connecting rod assembly by adjusting the curvature of the middle connecting rod 1032 and the position of the connecting point, namely the turning point, of the second connecting rod 1033 between the middle connecting rod 1032 and the backrest mounting seat 1034; specifically, the intermediate link 1032 is bent in an "L" shape, and the intermediate link 1032, the second link 1033, and the backrest mounting seat 1034 form a connection structure of a rectangular projection plane, wherein a center point of a connection point between the auxiliary link 1035 and the intermediate link 1032, that is, a rotation point, and a connection point between the second link 1033 and the intermediate link 1032, that is, a rotation point, are located on the same axis, and the two rotation points of the second link 1033 and the auxiliary link 1035, and the second link 1033 and the intermediate link 1032 are located above and below the seat frame 101, respectively; even if the second link 1033 and the auxiliary link 1035 for driving the backrest mount 1034 to move are vertically arranged and the backrest mount 1034 and the second link 1033 achieve the purpose of synchronous movement, when the suspension translation mechanism 102 and the seat frame 101 change postures, the first link 1031 rotates around the rotation point under the pushing or pulling force of the suspension translation mechanism 102, so as to sequentially drive the middle link 1032, the second link 103 and the auxiliary link 1035 to correspondingly rotate, at this time, the backrest mount 1034 makes corresponding posture changes under the action of the second link 103 and the auxiliary link 1035, and particularly, the backrest mount 1034 generates upward bending movement or downward bending movement along with the extending movement or the retracting movement of the second link (1033) under the synchronous action of the second link 103 and the auxiliary link 1035.

In the above-mentioned back linkage mechanism for the sofa, the two groups of suspension translation mechanisms 102 are arranged outside the two sides of the seat frame 101 in the symmetrical mirror image postures, the suspension translation mechanism 102 is a link assembly for realizing translation action, and at least comprises two types of parallelogram mechanisms connected with each other, the two types of parallelogram mechanisms sequentially act in sequence, and the motion trajectories of the two types of parallelogram mechanisms are mutually parallel or on the same axis, so as to achieve the purpose of translation action, and a mutually-constrained structure or motion trajectory is provided between the two links connected with the backrest mounting seat 1034, so that the suspension translation mechanism 102 can linearly translate the seat frame of the sofa forward alone or together with other mechanisms, so as to achieve the effect of not increasing the inclined space when the back linkage mechanism 103 is inclined.

The back linkage mechanism for the sofa further comprises armrest parts which are also positioned at two sides of the seat frame 101 and used for supporting the arms and elbows of a user, the armrest parts are substantially box-shaped structures which are provided with flexible coatings on the outer parts and are hollow in the inner parts, and the hanging translation mechanisms 102 arranged at the outer parts of the two sides of the seat frame 101 are embedded and fixed in the box-shaped structures of the armrest parts; meanwhile, the outer side of the bottom of the box-shaped structure of the armrest part is provided with the supporting leg, so that the bottom of the movable seat or the deformable sofa is lifted off the ground through the armrest part.

The back linkage mechanism for the sofa is characterized in that the suspension translation mechanism 102 is provided with two groups of linkage assemblies which are arranged inside the seat frame 101 in symmetrical mirror image postures, the suspension translation mechanism 102 is a linkage assembly for realizing translation action, specifically, the suspension translation mechanism 102 comprises two suspension units, the two suspension units are respectively connected with the substrate 1, the two suspension units and the substrate form at least a trilateral polygonal structure respectively, the two at least trilateral polygonal structures are respectively connected with the substrate to form one side of a trilateral polygon, and the two suspension units are connected through at least one linkage rod to limit and link the motion tracks of the two suspension units; wherein, the two suspension units and the base plate form a quadrilateral mechanism respectively.

The two suspension units are two suspension units with the opposite side lengths in proportion; the motion trail of the connecting rods opposite to the base plate has at least partial linear motion trail, and the motion trail between the connecting rods of the two suspension units at least comprises partial linear motion trail.

The back linkage mechanism for the sofa is characterized by further comprising armrest parts, wherein the armrest parts are positioned on two sides of the seat frame 101 and used for supporting arms and elbows of a user, the armrest parts are substantially box-shaped structures which are provided with flexible coatings on the outside and are hollow inside, and meanwhile, supporting legs are arranged on the outer sides of the bottoms of the box-shaped structures of the armrest parts, so that the bottoms of the movable seat or the deformable sofa can be lifted off the ground through the armrest parts.

The invention discloses a novel back mechanism for a movable seat or a functional sofa, which has the advantages that a connecting rod of a back linkage mechanism 103 is designed into a folding (or stacking) structure and a motion track, so that the requirement on the motion space is more linear in the motion process of the back linkage mechanism 103 and the control of the unfolding sequence of the connecting rod is realized, and thus, the internal space of the sofa can be skillfully utilized by combining the moving sequence of a suspension translation mechanism 102 and a seat frame 101 in the functional sofa, and the aim of saving the motion space is further fulfilled. And a larger space and depth are obtained for the seat plate next to the backrest linkage 103 and the armrests, so that the area of the cushion of the movable seat or the functional sofa can be further enlarged to improve the use comfort of the user. Meanwhile, a folding or stacking structure is adopted, and the connecting points (i.e. turning points) of the second connecting rod 1033, the middle connecting rod 1032 and the backrest mounting seat 1034 in the back linkage mechanism 103 are respectively changed from the traditional transverse arrangement to the vertical arrangement, and the two turning points are respectively positioned at the upper side and the lower side of the seat frame 101, so that when the back linkage mechanism 1033 acts, the whole action is synchronously carried out by matching with the motion of the suspension translation mechanism 102 and even the seat frame 101, therefore, the whole action track is more linear, the extrusion of the back mechanism 103 on the flexible coating is effectively avoided, and the feeling that a user is extruded in the process of changing the posture of the movable seat or the functional sofa is also avoided.

Also, while the present invention improves the back mechanism 103, the space required by the back mechanism 103 is reduced, so the suspension translation mechanism 102 is improved in arrangement and adjusted in motion trajectory; moreover, the combination of the suspension translation mechanism 102 and the backrest mechanism 103 is used together with the armrest with the arm brace in accordance with the layout of the suspension translation mechanism 102 after adjustment, so that the movable seat or the functional sofa has the characteristics of comfortable use and compact structure, and meanwhile, the bottom of the sofa is lifted off the ground, thereby being more convenient for the cleaning work of the bottom of the sofa.

Drawings

Fig. 1 is a schematic structural view of a functional sofa using a back mechanism provided by the present invention.

Fig. 2 is a schematic structural view of the folding state and the unfolding state of the back mechanism provided by the present invention.

Fig. 3 is a first schematic view of a suspension translation mechanism used in combination with the back mechanism provided by the present invention.

Fig. 4 is a second schematic view of a suspension translation mechanism used in combination with the back mechanism provided by the present invention.

Fig. 5 is a continuation of the schematic diagram of the suspension translation mechanism of fig. 4.

Fig. 6 is a second extension of the schematic diagram of the suspended translation mechanism of fig. 4.

Fig. 7 is a third extension of the schematic diagram of the suspended translation mechanism of fig. 4.

Fig. 8 is a fourth development of the schematic view of the suspension translation mechanism of fig. 4.

Fig. 9 is a comparison of a conventional back extension mechanism and the new back extension mechanism proposed by the present invention.

Detailed Description

The invention is further illustrated by the following specific examples.

Example 1

As shown in fig. 1, a back mechanism for a convertible sofa comprising at least a seat frame 101, a suspension translation mechanism 102 and a back mechanism 103; the back mechanism 103 is a connecting rod assembly which has a driven relationship and is rotatably connected with each other, and at least one connecting rod in the connecting rod assembly is rotatably connected with the suspension translation mechanism 102; therefore, when the suspension translation mechanism 102 makes posture transition, the back mechanism also makes corresponding posture transition; the link assembly constituting the back mechanism 102 includes a plurality of link bodies rotatably connected end to end and a back mount 1034 disposed on one of the link bodies and rotatably connected to the other link rod through the other auxiliary link rod so as to be fixed above the link bodies; the rod bodies which are mutually connected in a head-to-tail rotating way are in a folding state of being sequentially stacked when the deformable sofa is in a sitting posture, and are in a half-extending or full-extending unfolding state when the movable seat or the deformable sofa is in a TV posture or a lying posture respectively.

Example two

The second embodiment is a specific mode based on the first embodiment.

As shown in fig. 2, the link assembly of the back mechanism for convertible sofa, as shown in fig. 2, constituting the back mechanism 103 includes a first link 1031 having one end rotatably connected to the suspension translation mechanism 102 and transmitting pushing or pulling force to the subsequent adjacent link, the other end of the first link 1031 being connected to one end of an intermediate link 1032, the other end of the intermediate link 1032 being rotatably connected to one end of a second link 1033, the other end of the second link 1033 being connected to one end of the backrest mounting seat 1034, the other end of the backrest mounting seat 1034 being rotatably connected to an auxiliary link 1035, the other end of the auxiliary link 1035 being rotatably connected to the middle portion of the intermediate link 1032; thus, when the suspension translation mechanism 102 and the seat frame 101 change the posture, the first link 1031 is rotated around the rotation point by the pushing or pulling force of the suspension translation mechanism 102, so as to sequentially drive the middle link 1032, the second link 1033, and the auxiliary link 1035 to rotate correspondingly, and at this time, the backrest mounting seat also makes a corresponding posture change under the action of the second link 1033 and the auxiliary link 1035.

EXAMPLE III

The third embodiment is a further specific mode based on the second embodiment.

As shown in fig. 2, the back mechanism for a movable seat or a convertible sofa described above achieves the purpose of controlling the action sequence of the backrest mounting seats 1034 in the connecting rod assemblies by adjusting the curvature of the middle connecting rods 1032; specifically, the intermediate link 1032 is bent in an "L" shape, and the intermediate link 1032, the second link 1033, and the backrest mounting seat 1034 form a connection structure of a rectangular projection plane, wherein a center point of a connection point between the auxiliary link 1035 and the intermediate link 1032, that is, a rotation point, and a connection point between the second link 1033 and the intermediate link 1032, that is, a rotation point, are located on the same axis, and the two rotation points of the second link 1033 and the auxiliary link 1035, and the second link 1033 and the intermediate link 1032 are located above and below the seat frame 101, respectively; even if the second link 1033 and the auxiliary link 1035 for driving the backrest mount 1034 to move are vertically arranged and the backrest mount 1034 and the second link 1033 achieve the purpose of synchronous movement, when the suspension translation mechanism 102 and the seat frame 101 change the posture, the first link 1031 rotates around the rotation point under the pushing or pulling force of the suspension translation mechanism 102, so as to sequentially drive the middle link 1032, the second link 1033, and the auxiliary link 1035 to correspondingly rotate, at this time, the backrest mount 1034 also makes corresponding posture change under the action of the second link 1033 and the auxiliary link 1035, and particularly, the backrest mount 1034 generates upward bending movement or downward bending movement along with the extending movement or the retracting movement of the second link 1033 under the synchronous action of the second link 1033 and the auxiliary link 1035.

Example four

The fourth embodiment is a functional sofa having a suspension translation mechanism based on any one of the back mechanisms of embodiments 1 to 3.

As shown in fig. 1 and 3, the above-mentioned back mechanism for movable seats or convertible sofas has two sets of suspension translation mechanisms 102, which are arranged outside the two sides of the seat frame 101 in a symmetrical mirror-image posture, the suspension translation mechanism 102 is a link assembly for realizing translation action, it at least comprises two similar parallelogram mechanisms which are connected with each other, the two similar parallelogram mechanisms sequentially act in sequence, and the motion tracks are mutually parallel or positioned on the same axis, thereby achieving the purpose of translational action, the two links of the parallelogram-like mechanism connected to the backrest mount 1034 have a mutually-constrained structure or motion trajectory, therefore, the suspension translation mechanism 102 can linearly translate the seat frame 101 of the functional sofa forward alone or together with other mechanisms, so as to achieve the effect that the inclined space is not increased when the back mechanism 103 is inclined.

The back mechanism for the movable seat or the deformable sofa further comprises armrest parts which are also positioned at two sides of the seat frame and are used for supporting the arms and elbows of a user, the armrest parts are substantially box-shaped structures which are provided with flexible coatings at the outer parts and are hollow at the inner parts, and the suspension translation mechanisms arranged at the outer parts of the two sides of the seat frame are embedded and fixed in the box-shaped structures of the armrest parts; meanwhile, the outer side of the bottom of the box-shaped structure of the armrest part is provided with the supporting leg, so that the bottom of the movable seat or the deformable sofa is lifted off the ground through the armrest part.

EXAMPLE five

The fifth embodiment is a specific mode based on the fourth embodiment.

As shown in fig. 3, the suspension translation mechanism 102 of the back mechanism for the movable seat or the convertible sofa can be selected from the following specific modes: comprises a base plate 1 ', one end of the base plate 1' is movably hinged with one end of a first connecting rod 2 ', the proximal end of the other end of the base plate 1' is movably hinged with one end of a second connecting rod 4 ', the top end of a third connecting rod 3' and the top end of a fourth connecting rod 5 'are hinged on the position which is higher than the middle of the other ends of the first connecting rod 2' and the second connecting rod 4 ', and the third connecting rod 3' and the fourth connecting rod 5 'are not directly connected with the base plate 1'. In order to define the movement trajectories of the first link 2 ', the second link 4 ', the third link 3 ' and the fourth link 5 ', a first connecting rod 6 ' is provided between the other top end of the third link 3 ' and the other top end of the fourth link 5 ', and the top end of the first link 2 ' and the top end of the second link 4 ' are connected by a second connecting rod 8 ', which second connecting rod 8 ' is not of rectilinear design but is a recessed connecting rod. A third connecting rod 7 ' is arranged between the fourth connecting rod 5 ' and the second connecting rod 8 '. The first connecting rod 6 ', the second connecting rod 8 ' and the third connecting rod 7 ' are limited in order to enable the suspension translation mechanism to linearly translate the functional sofa frame forwards, so that the function of not increasing the inclined space when the back mechanism is inclined is achieved. It becomes possible to place the functional sofa at a short distance from the wall.

The suspension translation mechanisms are arranged on the left side and the right side of the seat frame in the functional sofa as shown in figure 3. By means of the mechanism in fig. 1, the base plate 1 'is arranged in the sofa frame, for example, the armrest of the outer wooden frame, and the rest, in particular the first connecting rod 6' and/or the third connecting rod 3 'and the fourth connecting rod 5', is directly or indirectly connected to the sofa seat frame 101. Due to the design, the motion trail of the mechanism can be limited, so that the motion trail of the moving connecting rod 6' is a motion trail with linear motion.

EXAMPLE six

The sixth embodiment is a specific choice of yet another suspension system parallel to the fifth embodiment.

As shown in fig. 4, the back mechanism for a movable seat or a convertible sofa has two sets of suspension translation mechanisms 102 arranged inside a seat frame 101 in symmetrical mirror-image postures, the suspension translation mechanisms 102 are link assemblies for realizing translation motion, and specifically, the suspension translation mechanisms 102 include two suspension units, the two suspension units are respectively connected to a base plate 1, the two suspension units and the base plate 1 respectively form at least a trilateral polygonal structure, the two at least trilateral polygonal structures are respectively connected to the base plate 1 to form one side of a trilateral polygon, and the two suspension units are connected through at least one link to limit and link the motion tracks of the two suspension units; wherein, the two suspension units and the base plate 1 respectively form a quadrilateral mechanism.

The two suspension units are two suspension units with the opposite side lengths being proportional to each other; the motion trail of the link relative to the base plate 1 has at least a part of linear motion trail, and the motion trail between the links of the two suspension units at least comprises a part of linear motion trail.

The back mechanism of the movable seat or the deformable sofa further comprises armrest parts, wherein the armrest parts are positioned on two sides of the seat frame and used for supporting the arms and elbows of a user, the armrest parts are substantially box-shaped structures which are provided with flexible coatings on the outside and hollow inside, and meanwhile, supporting legs are arranged on the outer sides of the bottoms of the box-shaped structures of the armrest parts, so that the bottoms of the movable seat or the deformable sofa are lifted off the ground through the armrest parts.

EXAMPLE seven

The seventh embodiment is a specific mode based on the sixth embodiment.

As shown in fig. 4-8, a suspension translation mechanism 102 is provided that also contributes to saving movement space, specifically: the base plate 1 comprises two suspension units, the two suspension units are respectively connected with the base plate 1, the two suspension units and the base plate form at least a trilateral polygonal structure, the two at least trilateral polygonal structures are respectively connected with the base plate to form one side of a trilateral polygon, the two suspension units are connected through at least one connecting rod to limit and link the movement tracks of the two suspension units, and the two suspension units and the base plate form a quadrilateral mechanism respectively.

Further, the first suspension unit comprises a first connecting rod 2, a second connecting rod 3 and a third connecting rod 4, wherein one end of the first connecting rod 2 is rotatably connected with a first connecting point 9 on the substrate 1, the other end of the first connecting rod 2 is rotatably connected with one end of the second connecting rod 3, the middle of the second connecting rod 3 is connected with the top end of the third connecting rod 4, and the other end of the third connecting rod 4 is connected with a second connecting point 10 on the substrate 1.

And the two suspension units are two suspension units with the opposite side lengths in proportion.

The two suspension units of the suspension translation mechanism of the sofa are the same, the second suspension unit comprises a fourth connecting rod 5, a fifth connecting rod 6 and a sixth connecting rod 7, one end of the fourth connecting rod 5 is rotatably connected to a third connecting point 11 on the base plate 1, the other end of the fourth connecting rod 5 is rotatably connected to one end of the fifth connecting rod 6, the middle part of the fifth connecting rod 6 is rotatably connected to the top end of the sixth connecting rod 7, and the other end of the third connecting rod 7 is rotatably connected to a fourth connecting point 12 on the base plate 1; the other end of the second connecting rod 3 is connected with a fifth connecting rod 6 through a first connecting rod 8, and the distance from the first connecting point to the second connecting point is equal to the distance from the third connecting point to the fourth connecting point.

In the suspension translation mechanism of the sofa, the ratio of the length from the first connecting point 9 to the second connecting point 10 to the length from the second connecting point 10 to the sixth connecting point 15 is 4.2: 1 to 5.3: 1, the ratio of the length of the second connection point 10 to the sixth connection point 15 to the length of the sixth connection point 15 to the fifth connection point 14 is 0.8: 1 to 1.2: 1, the length ratio of the sixth connecting point 15 to the fifth connecting point 14 to the length ratio of the fifth connecting point 14 to the first connecting point 9 is 0.18: 1 to 0.25: 1.

in the suspension translation mechanism of the sofa, the motion trail of the connecting rod relative to the base plate 1 has at least a part of linear motion trail.

In the suspension translation mechanism of the sofa, the relative connecting rods of the base plate 1 are at least partial linear motion tracks of the second connecting rod 3 and the fifth connecting rod 6.

In the suspension translation mechanism of the sofa, the motion tracks of the seventh connecting point 16 of the second connecting rod 3 and the eighth connecting point 13 of the fifth connecting rod 6 are partially linear motion.

In summary of the above embodiments, the present invention essentially provides a new back linkage mechanism, and a sofa backrest using the new back linkage mechanism has the following movement sequence and action characteristics when in use:

a sofa comprises a seat frame supporting mechanism 101, a hanging translation mechanism 102 and a back linkage mechanism 103; the connecting rod assembly of the back linkage mechanism (103) comprises a first connecting rod 1031, one end of which is rotatably connected with the suspension translation mechanism 102 and transmits pushing force or pulling force to a subsequent adjacent connecting rod, the other end of the first connecting rod 1031 is connected with one end of an intermediate connecting rod 1032, the other end of the intermediate connecting rod 1032 is rotatably connected with one end of a second connecting rod 1033, the other end of the second connecting rod 1033 is connected with one end of a backrest mounting seat 1034, the other end of the backrest mounting seat 1034 is rotatably connected with an auxiliary connecting rod 1035, and the other end of the auxiliary connecting rod 1035 is rotatably connected with the middle part of the intermediate connecting rod 1032; the middle link 1032 is bent in an "L" shape, the middle link 1032, the second link 1033, and the backrest mounting seat 1034 form a connection structure of a rectangular projection plane, a connection point between the auxiliary link 1035 and the middle link 1032, that is, a rotation point, and a central point between the connection point between the second link 1033 and the middle link 1032, that is, a rotation point, are located on the same axis, and the two rotation points of the second link 1033 and the auxiliary link 1035, and the second link 1033 and the middle link 1032 are located above and below the seat frame 101, respectively; even if the second link 1033 and the auxiliary link 1035 for driving the backrest mount 1034 to move are vertically arranged and the backrest mount 1034 and the second link 1033 achieve the purpose of synchronous movement, when the suspension translation mechanism 102 and the seat frame 101 change postures, the first link 1031 rotates around a rotation point under the pushing or pulling force of the suspension translation mechanism 102, so as to sequentially drive the middle link 1032, the second link 103 and the auxiliary link 1035 to correspondingly rotate, at this time, the backrest mount 1034 also makes a corresponding posture change under the action of the second link 103 and the auxiliary link 1035, and particularly, the backrest mount 1034 generates an upward bending movement or a downward bending movement along with the extension movement or the contraction movement of the second link 3 under the synchronous action of the second link 103 and the auxiliary link 1035.

The new back linkage mechanism for sofa provided by the present invention has the advantages that the link of the back linkage mechanism is designed to be a folding (or stacking) structure and the driving rod (i.e. the second link 1033 and the auxiliary link 1035) of the back mounting seat 1034 is vertically arranged (as shown in fig. 9), that is, the rotation points a and b are vertically distributed, so that more seating depth space is left, while the conventional sofa iron frame horizontally arranges the rotation points a 'and b' of the back mounting seat, so that the depth space of the seating surface is occupied during the action of the back mounting seat, thereby reducing the seating depth and affecting the experience. Furthermore, the mechanical stretching device relies on the improved suspension translation mechanism and the improved backrest stretching mechanism, and the requirement on the motion space is more linear in the motion process of the back mechanism, and the control of the unfolding sequence of the connecting rod assembly is realized, so that the internal space of the sofa can be ingeniously utilized by combining the moving sequence of the suspension translation mechanism and the seat frame in the functional sofa, and the purpose of saving the motion space is further achieved. In this way, a larger space and depth are obtained for the seat plate next to the backrest mechanism and the armrest, and the area of the cushion of the movable seat or the functional sofa can be further enlarged to improve the comfort of the user. Meanwhile, a folding or stacking structure is adopted, when the back mechanism acts, the whole action is synchronously carried out by matching with the motion of the suspension translation mechanism and even the seat frame, so that the whole action track is more linear, the extrusion of the back mechanism to the flexible coating is effectively avoided, and the extrusion feeling of a user in the process of changing the posture of the movable seat or the functional sofa is also avoided.

Claims

1. A back linkage for a sofa comprising at least a seat frame support mechanism (101), a suspension translation mechanism (102) and a back linkage mechanism (103); the back linkage mechanism (103) is a connecting rod assembly which has a driven relationship and is rotatably connected with each other, and at least one connecting rod in the connecting rod assembly is rotatably connected with the suspension translation mechanism (102); when the suspension translation mechanism (102) is subjected to posture transformation, the back linkage mechanism (103) also makes corresponding posture transformation; the back linkage mechanism is characterized in that a connecting rod assembly forming the back linkage mechanism (103) comprises a plurality of rod bodies which are mutually connected in a head-to-tail rotating way and a back mounting seat (1034) which is arranged on one rod body, is connected with the other rod body in a rotating way through the other auxiliary connecting rod and is fixed above the rod body; the rod bodies which are mutually connected in a head-to-tail rotating way are in a transversely and sequentially stacked folding state when the sofa is in a sitting posture, and are in a half-extending or full-extending unfolding state when the sofa is in a TV posture or a lying posture respectively.

2. A back linkage for a sofa according to claim 1, characterized in that the link assembly constituting the back linkage (103) comprises a first link (1031) having one end rotatably connected to the suspension translation mechanism (102) and transmitting pushing or pulling force to the subsequent adjacent link, the other end of the first link (1031) being connected to one end of an intermediate link (1032), the other end of the intermediate link (1032) being rotatably connected to one end of a second link (1033), the other end of the second link (1033) being connected to one end of the backrest mount (1034), the other end of the backrest mount (1034) being rotatably connected to an auxiliary link (1035), the other end of the auxiliary link (1035) being rotatably connected to the middle part of the intermediate link (1032); thus, when the suspension translation mechanism (102) and the seat frame (101) change the posture, the first link (1031) rotates around the rotation point under the pushing or pulling force of the suspension translation mechanism (102), so as to sequentially drive the middle link (1032), the second link (1033), and the auxiliary link (1035) to correspondingly rotate, and at this time, the backrest mounting seat (1034) also makes a corresponding posture change under the action of the second link (1033) and the auxiliary link (1035).

3. The back mechanism for a sofa of claim 2, wherein the purpose of controlling the sequence of the backrest mounting seat (1034) in the connecting rod assembly is achieved by adjusting the curvature of the middle connecting rod (1032) and the position of the second connecting rod (1033) at the connecting point of the middle connecting rod (1032) and the backrest mounting seat (1034), i.e. the turning point; specifically, the intermediate link (1032) is bent in an "L" shape, and the three of the intermediate link (1032), the second link (1033), and the backrest mount (1034) constitute a connection structure of a rectangular projection surface, wherein a connection point, i.e., a turning point, of the auxiliary link (1035) and the intermediate link (1032) and a central point, i.e., a turning point, of a connection point, i.e., a turning point, of the second link (1033) and the intermediate link (1032), are located on the same axis, and two turning points, i.e., a turning point, of the second link (1033) and the auxiliary link (1035), and of the second link (1033) and the intermediate link (1032), are located above and below the seat frame (101), respectively, even if the second link (1035) and the auxiliary link (1033) for driving the backrest mount (1034) to move are vertically arranged and the backrest mount (1034) and the second link (1033) to move synchronously, so that when the suspension translation mechanism (102) and the seat frame (101) change postures, the first link (1031) rotates around a rotation point under the pushing or pulling force of the suspension translation mechanism (102), so as to sequentially drive the middle link (1032), the second link (103) and the auxiliary link (1035) to correspondingly rotate, at this time, the backrest mounting seat (1034) also makes a corresponding posture change under the action of the second link (103) and the auxiliary link (1035), and particularly, the backrest mounting seat (1034) generates an upward bending movement or a downward bending movement along with the extension movement or the contraction movement of the second link (1033) under the synchronous action of the second link (103) and the auxiliary link (1035).

4. The back linkage mechanism for the sofa according to any one of claims 1 to 3, wherein the suspension translation mechanism (102) has two groups, which are arranged outside the two sides of the seat frame (101) in symmetrical mirror image postures, the suspension translation mechanism (102) is a linkage assembly for realizing translation action, and comprises at least two parallelogram-like mechanisms connected with each other, the two parallelogram-like mechanisms sequentially act in sequence and the motion tracks are mutually parallel or on the same axis, so as to achieve the purpose of translation action, and a mutually-constrained structure or motion track is arranged between the two linkage rods connected with the backrest installation seat (1034) of the parallelogram-like mechanism, so that the suspension translation mechanism (102) can linearly translate the seat frame of the sofa forward alone or together with other mechanisms so as to achieve the inclination of the back linkage mechanism (103), the effect of the inclined space is not increased.

5. The back mechanism for a movable seat or a convertible sofa as claimed in claim 4, further comprising armrest portions, also located on both sides of the seat frame (101), for supporting the user's arms and elbows, the armrest portions being substantially a box-shaped structure with a flexible covering on the outside and a hollow inside, the suspension translation mechanisms (102) arranged on both sides of the seat frame (101) being embedded and fixed in the box-shaped structure of the armrest portions; meanwhile, the outer side of the bottom of the box-shaped structure of the armrest part is provided with the supporting leg, so that the bottom of the movable seat or the deformable sofa is lifted off the ground through the armrest part.

6. The back linkage mechanism for the sofa according to any one of claims 1 to 3, wherein the suspension translation mechanism (102) has two sets of linkage assemblies arranged inside the seat frame (101) in symmetrical mirror-image postures, the suspension translation mechanism (102) is a linkage assembly for realizing translation motion, and specifically, the suspension translation mechanism (102) comprises two suspension units, the two suspension units are respectively connected with the base plate (1), the two suspension units and the base plate form at least a trilateral polygonal structure, the two at least trilateral polygonal structures are respectively connected with the base plate to form one side of the trilateral polygon, and the two suspension units are connected through at least one linkage to limit and link the motion tracks of the two suspension units; wherein, the two suspension units and the base plate form a quadrilateral mechanism respectively.

7. The back linkage for a sofa of claim 6, wherein the two suspension units are two suspension units having opposite side lengths proportional; the motion trail of the connecting rods opposite to the base plate has at least partial linear motion trail, and the motion trail between the connecting rods of the two suspension units at least comprises partial linear motion trail.

8. The back linkage mechanism for sofa of claim 6, further comprising armrest portions on both sides of the seat frame 101 for supporting the user's arms and elbows, wherein the armrest portion is substantially a box-shaped structure with a flexible covering on the outside and a hollow inside, and the outer side of the bottom of the box-shaped structure of the armrest portion is provided with legs so that the bottom of the movable seat or the deformable sofa can be lifted off the ground through the armrest portions.