CN220458958U - Supporting mechanism for seat and seat - Google Patents

Abstract

The utility model aims to provide a supporting mechanism for a seat, which comprises a seat frame, a supporting beam and a bearing component arranged between the seat frame and the supporting beam, wherein the seat frame comprises seat frame side rods which are arranged in a bilateral symmetry mode, the bearing component is arranged to be a front support which extends forwards obliquely from the supporting beam and a rear support which extends backwards obliquely, the bearing component is symmetrically arranged at two ends of the supporting beam, and then the front support and the rear support form a V-shaped support for the seat frame side rods to form a stable triangle structure, so that the supporting mechanism has the effects of small occupied space and good supporting stability.

Description

Supporting mechanism for seat and seat

Technical Field

The utility model relates to the field of seats, in particular to a supporting mechanism for a seat and the seat.

Background

In the daily use of the seat, especially the folding chair, a supporting mechanism is often used for supporting the weight of the whole seat surface and the seat frame of the seat, so that the situation that the seat frame is deformed, distorted or even cracked can not occur when the folding chair is used is ensured.

The conventional folding chairs are usually provided with supporting mechanisms at the seat frames to ensure the daily use of the folding chairs, but most of the folding chairs are too complex in supporting mechanism design structure, unsatisfactory in supporting stabilizing effect and relatively poor in use experience.

For example, in the patent of a support mechanism of a folding chair of CN 218683087, the folding chair increases the support strength of the chair by providing the connecting posts 6 between the legs 2, so that the folding chair has poor appearance, and according to the fig. 1 and 2 of the patent, the overall structure of the support structure 3 provided between the connecting posts and the connection manner with the connecting posts 6 of the folding chair are also complex, and the installation is not simple enough for the user, and the use experience is poor.

For this purpose, the applicant has found, through a beneficial search and study, a solution to the above-mentioned problems, against which the technical solutions to be described below are developed.

Disclosure of Invention

In order to solve the technical problems, the utility model aims at providing a supporting mechanism for a seat, which comprises a seat frame, a supporting beam and a bearing component arranged between the seat frame and the supporting beam, wherein the front bracket extending obliquely forwards from the supporting beam on the bearing component and the rear bracket extending obliquely backwards are connected with seat frame side bars symmetrically arranged on the seat frame, so that the front bracket and the rear bracket form a V-shaped support for the seat frame side bars and form a stable triangle structure with the seat frame side bars.

Still further, the present utility model provides a seat equipped with the above-mentioned support mechanism, which does not affect its support effect on the seat frame even if it is simple in structure.

The technical scheme of the utility model is realized as follows:

a support mechanism for a seat, comprising:

the support assembly comprises a seat frame, a support beam and a support assembly arranged between the seat frame and the support beam, wherein the seat frame comprises seat frame side rods which are arranged in a bilateral symmetry mode, the support assembly is installed at one end of the support beam, the support assembly comprises a front support extending forwards obliquely from the support beam and a rear support extending backwards obliquely from the support beam, the upper ends of the front support and the rear support are respectively connected to corresponding positions of the seat frame side rods, and the front support and the rear support are opposite to the seat frame side rods to form a V-shaped support.

Preferably, the seat frame side rod is provided with a mounting groove in advance, an insertion notch which is preset and communicated is arranged below the mounting groove, the upper end of the front support is connected with a support shaft, at least one tangent plane is arranged on the support shaft, so that a milling part is formed at the tangent plane, the thickness of the milling part is smaller than the diameter of the support shaft, the seat frame side rod enables the milling part to be inserted into the mounting groove along the tangent plane direction through the insertion notch, and meanwhile, the milling part cannot be separated from the insertion notch when deviating from the insertion direction in the mounting groove.

Preferably, an open slot is formed in the upper end of the seat frame side rod, the lower end of the open slot is communicated with the mounting slot through a through slot, a mounting screw hole is preset in the tangential plane, a threaded fastener penetrates through the through slot and is screwed into the mounting screw hole, and the length of the through slot is larger than the diameter of the threaded fastener so as to play a role in limiting rotation of the seat frame.

Preferably, the notch of the open slot is detachably provided with a sealing cover, and the sealing cover is used for sealing the open slot so as to ensure the integrity and the beauty of the upper surface of the side rod of the seat frame and prevent dust and moisture from entering.

Preferably, the front support is 5-10cm in length and the rear support is 5-10cm in length, which makes the horizontal length of the support assembly moderate and small in space.

Preferably, the inclination angle of the front support relative to the horizontal plane is 30-60 degrees, and the inclination angle of the rear support relative to the horizontal plane is 40-60 degrees.

Preferably, a limit groove is formed at a corresponding position of the lower end of the seat frame side rod matched with the rear support, the upper end of the rear support is inserted into the limit groove, and when the rear support is separated from the limit groove, the seat frame rotates around the front support, so that the seat frame can be conveniently turned over and adjusted.

Preferably, the limit groove is obliquely arranged on the bottom surface of the seat frame side rod, a notch is formed at the lower end of the limit groove, a limit clamping plate matched with the limit groove is bent at the upper end of the rear support, the rear support is configured to rotate around the support beam, and when the rear support rotates under the action of external force, the limit clamping plate enters or leaves the limit groove, so that the seat frame is more convenient to adjust.

Preferably, an elastic member is provided between the support beam and the rear bracket, and the elastic member is configured to maintain the rear bracket in a tendency to be inserted into the limit groove, which ensures that the rear bracket does not escape from the limit groove due to its own weight when supporting the seat frame, thereby making the support more stable.

Preferably, the lower end of the front bracket is fixed relative to the supporting beam in the circumferential direction, or the front bracket is configured to be rotatable about the supporting beam within a range of 3-6 degrees, and the seat frame can be stably supported when the front bracket is fixed relative to the supporting beam in the circumferential direction; when the front support is rotatable, the seat frame can be stably supported and simultaneously rotates back and forth at a small angle along the circumferential direction of the support beam, so that the user is provided with the most comfortable experience.

Preferably, the supporting members are disposed at both left and right ends of the supporting beam in pairs, and the supporting members in pairs form four fulcrums to stably support the seat frame.

Preferably, the front bracket and the rear bracket are straight rods. The structure is simple and reliable.

Further provided is a seat comprising at least two symmetrical seat bearings, the two ends of the support beam being each mounted on a respective seat bearing.

The principle and beneficial effects of the utility model adopting the technical scheme are as follows:

the utility model aims at providing a supporting mechanism for a seat, which comprises a seat frame, a supporting beam and a bearing component arranged between the seat frame and the supporting beam, wherein the seat frame comprises seat frame side rods which are symmetrically arranged left and right, the bearing component is arranged to be a front support which obliquely extends forwards from the supporting beam and a rear support which obliquely extends backwards, the bearing component is symmetrically arranged at two ends of the supporting beam, and then the front support and the rear support form a V-shaped support for the seat frame side rods to form a stable triangle structure, so that the supporting mechanism has the effects of small occupied space and good supporting stability.

Drawings

FIG. 1 is an enlarged schematic view of a limit clamping plate clamped into a limit groove;

FIG. 2 is an enlarged view of the limiting groove for the escape of the limiting clamp;

FIG. 3 is an exploded view of the support mechanism according to the embodiment;

figure 4 is a partial cross-sectional view of the bearing assembly of the support mechanism of the embodiment;

figure 5 is an exploded view of the support mechanism of the embodiment where the bearing assembly is mounted;

FIG. 6 is a schematic structural view of the rear bracket;

FIG. 7 is a schematic view of a support beam;

FIG. 8 is a schematic structural view of a front bracket;

FIG. 9 is a schematic view of a structure of a shaft sleeve according to an embodiment;

FIG. 10 is an exploded view of the mounting of the support shaft and the seat frame of the front bracket;

FIG. 11 is an enlarged view of the mounting groove of the seat side lever;

FIG. 12 is a schematic view of the support mechanism bearing frame;

FIG. 13 is a partial cross-sectional view of the front bracket at the mounting of the support shaft to the bezel;

FIG. 14 is a cross-sectional view of the support shaft mounting for the front bracket;

the reference numerals are as follows: 1-supporting beam, 2-adjusting spanner, 3-spring steel bar, 4-torsion spring, 5-rear bracket, 6-protecting cover, 7-front bracket, 8-shaft sleeve, 9-second screw fastener, 10-first screw fastener, 11-first limit screw, 12-second limit screw, 13-seat frame, 14-back frame, 15-sheath, 16-screw fastener, 17-sealing cover, 101-first screw hole, 102-second screw hole, 103-inner lining plate, 104-avoidance hole, 105-installation chute, 106-inserting section, 201-countersunk through hole, 202-connecting part, 203-operating part, 204-spanner plate, 51-third screw hole, 52-first notch, 53-first sleeve, 54-stopper plate, 61-through hole c, 71-second notch, 72-fourth screw hole, 73-end cap, 74-slot, 75-second sleeve, 76-mounting screw hole, 77-tangential plane, 78-supporting shaft, 79-milling flat, 701-stopper plate, 702-annular gap, 81-through hole a, 82-through hole b, 83-inner cylindrical surface, 131-stopper groove, 132-seat frame side bar, 133-through notch, 134-insertion notch, 135-mounting groove, 136-open groove

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

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

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

The specific embodiments of the present utility model are as follows:

example 1: as shown in fig. 1 to 8, the present embodiment provides a supporting mechanism applied to a seat, the supporting mechanism includes a seat frame 13, a supporting beam 1 and a bearing assembly disposed therebetween, in the seat, the supporting beam 1 is supported at the upper end positions of two bilaterally symmetrical leg assemblies, the leg assemblies form a seat bearing member, the seat frame 13 and a back frame 14 are integrally constructed so that they can synchronously act, the bearing assemblies are symmetrically mounted at both ends of the supporting beam 1, the seat frame 13 includes bilaterally symmetrically disposed seat frame side bars 132, and each bearing assembly correspondingly supports one seat frame side bar 132, thereby stably supporting the seat frame 13; the bearing assembly comprises a front bracket 7 extending forwards obliquely and a rear bracket 5 extending backwards obliquely from the support beam 1, and the core utility model is that the upper ends of the front bracket 7 and the rear bracket 5 are respectively connected to corresponding positions of the seat frame side rods 132, and the rear bracket 5 of the front bracket 7 forms a group of symmetrical V-shaped supports with small occupied space and stable structure for the seat frame side rods 132. The front bracket 7 and the rear bracket 5 are straight rods, and the width of the front bracket 7 is thicker from the position of the supporting beam 1 to the upper end direction; the same is true of the rear bracket 5, guaranteeing the supporting stability of the foundation.

As shown in fig. 10 to 14, the connection between the front bracket 7 and the seat frame 13 is achieved in such a way that: the seat frame side lever 132 is preset with a mounting groove 135, a preset and penetrating insertion notch 134 is arranged below the mounting groove 135, the upper end part of the front bracket 7, which is connected with the seat frame 13, extends forwards and is provided with a support shaft 78, the support shaft 78 and the front bracket 7 are kept relatively fixed and can not rotate relatively, for example, the support shaft 78 can be realized in a welding mode, two tangent planes 77 are symmetrically arranged on the support shaft 78 so as to form a milling part 79 at the tangent plane part, and the tangent planes 77 are arranged so that the support shaft 78 can penetrate through the insertion notch 34; when the seat frame side lever 132 inserts the flat-milled portion 79 into the mounting groove 135 through the insertion notch 134 in the direction of the tangential surface 77 while the flat-milled portion 79 rotates in the mounting groove 135, the insertion notch 134 is not aligned with the flat-milled portion 79, and the support shaft 78 cannot be separated from the mounting groove 135 from the insertion notch 134, thereby completing the connection of the front bracket 7 and the seat frame 13.

As shown in fig. 10 and 11, after the front bracket 7 is connected to the seat frame 13, the seat frame 13 may rotate relative to the front bracket 7, but in order to prevent the insertion slot 134 on the seat frame 13 from aligning with the milled portion 79 on the front bracket 7, the seat frame 13 is separated from the front bracket 7, and the rotation angle is limited, and this limiting process is implemented as follows: an open slot 136 is provided at the upper end of the seat frame side lever 132, the lower end of the open slot 136 communicates with the mounting slot 135 through a through slot 133, a mounting screw hole 76 is preset in the tangential plane 77 of the front bracket 7, a threaded fastener 16 is threaded into the mounting screw hole 76 through the through slot 133, and the rotation angle of the seat frame 13 is restricted by restricting the length of the through slot 133.

As shown in fig. 3-7, the tail end of the front bracket 7 is sleeved on the supporting beam 1 through the second sleeve 75 formed integrally, of course, the front bracket 7 can be designed to be relatively fixed with the supporting beam in the circumferential direction, but in the actual use process, in order to improve the sitting experience of a user, the front bracket 7 is configured to be capable of rotating by a small angle of 5-10 degrees, so that the seat frame 13 can rotate integrally with the front bracket 7, and the free function of leaning forward and backward is realized; specifically, the method is configured in the following way: a second notch 71 is formed in the second sleeve 75, a second screw hole 102 is preset at a corresponding position on the support beam 1, a second limit screw 12 is penetrated into the second screw hole 102, and the second limit screw 12 is positioned in the second notch 71; in this way, the second limit screw 12 axially fixes the front bracket 7 on the support beam 1, and the rotation range of the front bracket 7 is limited by the cooperation with the second notch 71, that is, the rotatable angle of the front bracket 7 is determined by the length of the second notch 71, and it is worth mentioning that the length of the second notch 71 is smaller than that of the first notch 52, so that when the support mechanism enters the support state, the seat frame 13 can still rotate back and forth at a slight angle along the circumferential direction of the support beam 1, thereby giving the user the most comfortable experience.

In order to enable the front bracket 7 to rotate with a certain pretightening force and be convenient to reset, a certain elastic pretightening force is added to the front bracket, and the front bracket is realized in the following manner: as shown in fig. 5 and 7, the supporting beam 1 is a hollow cylinder, a spring steel bar 3 is threaded into the supporting beam 1, a lining plate 103 is fixedly arranged in the supporting beam 1 in advance, a avoiding hole 104 is formed in the lining plate 103, the spring steel bar 3 is threaded through the avoiding hole 104 of the lining plate 103, so that the spring steel bar 3 is circumferentially fixed in the supporting beam 1, and the structural strength of the whole supporting beam 1 is increased.

As shown in fig. 4-8, when the supporting arm 7 is installed, the spring steel bar 3 passes through a preset slot 74 on the end cover 73 at the tail end of the supporting arm 7; specifically, the section of the spring steel bar 3 is flat, the supporting arm 7 is sleeved on the cross beam 1 through a second sleeve 75 formed at the tail part, one end of the second sleeve 75 is opened, the end cover 73 is formed at the other end of the second sleeve 75, namely the same side end of the supporting arm 7, the end part of the cross beam 1 forms a section of inserting section 106 which is in inserted fit with the second sleeve 75, at least one installation chute 105 is formed on the inserting section 106 along the axial direction of the cross beam 1, the initial end of the installation chute 105 corresponds to the end of the cross beam 1 and is opened, the tail end of the installation chute 105 extends towards the middle part of the cross beam 1, and the installation chute 105 is inclined in a spiral manner from the initial end to the tail end, namely is deflected along the circumferential direction; the end cover 73 does not seal the cylinder mouth of the second sleeve 75 completely, a part of the circumference of the end cover 73 is connected with the supporting arm 7 and is integrally formed, a limiting plate 701 which can be inserted into the installation chute 105 is formed at the joint of the end cover 73 and the supporting arm 7, an annular gap 702 is formed between the other part of the circumference of the end cover 73 and the inner wall of the second sleeve 75, when the second sleeve 75 is sleeved with the cross beam 1, the spring steel bar 3 is firstly inserted into the slot 74 on the end cover 73, the limiting plate 701 is gradually inserted into the installation chute 105, the inserting section 106 is inserted into the annular gap 702, and as the second sleeve 75 is gradually inserted in, the limiting plate 701 is guided by the installation chute 105 and deflects a certain angle relative to the rectangular avoidance hole 104 of the inner lining plate 103 along the circumferential direction, so that the spring steel bar 3 is twisted to generate pretightening force, and the width of the limiting plate 701 is smaller than the width of the tail end of the installation chute 105, thereby leaving a margin for the rotation of the supporting arm 7 relative to the cross beam 1; the cooperation of the second limit screw 12 and the second notch 71 can maintain the pre-tightening elasticity; that is to say that the spring steel bar 3 has been slightly twisted by the support arm 7, with a certain preload.

When the supporting mechanism is in a supporting state, the seat frame 13 can rotate together with the front support 7, and due to the existence of pretightening force during installation, the front support 7 can more easily make the spring steel bar 3 generate torsion deformation during rotation so as to generate reset elastic force of the seat frame 13.

As shown in fig. 10-14, the seat frame 13 can rotate relative to the front bracket 7, a sheath 15 can be installed at the milling part 79 of the front bracket 7, and by wrapping the sheath 15, not only the rotation abrasion between the support shaft 78 on the front bracket 7 and the installation groove 135 of the seat frame side lever 132 can be reduced, but also the installation cooperation between the support shaft 78 and the installation groove 135 can be more compact.

As shown in fig. 3, 4 and 8, a pair of protecting covers 6 which are symmetrical left and right can be further arranged, the protecting covers 6 are decorative plates made of plastics, a through hole c61 is arranged on each protecting cover 6, a fourth screw hole 72 is preset on the front bracket 7, and a second threaded fastener 9 penetrates through the through hole c61 and is screwed into the fourth screw hole 72; therefore, when the protecting cover 6 and the front support 7 synchronously move, the function of shielding decoration is achieved, part of dust can be effectively prevented from entering the supporting mechanism, and the normal operation of the supporting mechanism is ensured.

As shown in fig. 2-7, the rear bracket 5 is connected with the seat frame 13 and is rotatable relative to the support beam 1, specifically, a limit groove 131 is obliquely arranged on the bottom surface of the seat frame side lever 132, a limit clamping plate 54 matched with the limit groove 131 is bent and formed at the upper end of the rear bracket 5, when the rear bracket 5 rotates under the action of external force, the limit clamping plate 51 is inserted into the limit groove 131, the rest rear bracket 5 of the front bracket 7 forms stable support for the seat frame 13, and when the limit clamping plate 54 leaves the limit groove 131, the seat frame 13 can rotate around the front bracket 7.

Specifically, the external force of the rear bracket 5 is controlled by connecting the rear bracket 5 with the adjusting wrench 2, and the limiting clamping plate 54 can be selectively matched with the limiting groove 131 under the action of the adjusting wrench 2, so that the supporting mechanism forms a supporting state and a releasing state.

The supporting state of the seat frame 13 is realized as follows: when the limiting clamping plate 54 is clamped in the limiting groove 131 preset below the laterally symmetrical seat side rod 132 on the seat frame 13, the limiting groove 131 limits the limiting clamping plate 54 to be separated, and the seat frame 13 is stably supported.

The disengagement state of the seat frame 13 is realized in such a way that: when the seat frame 13 needs to be disconnected, the adjusting spanner 2 is pulled to drive the rear bracket 5 to rotate, so that the limiting clamping plate 54 on the rear bracket 5 is separated from the limiting groove 131, the seat frame 13 connected with the upper end of the front bracket 7 loses the supporting point provided by the rear bracket 5, and the seat frame 13 can rotate relative to the front bracket 7 to adjust the position.

The reset state of the bezel 13 is achieved as follows: because the limit groove 131 is obliquely arranged and is limited by the arc-shaped rotation track of the seat frame or the rear bracket 5, the limit groove 131 is difficult to clamp into, as shown in fig. 1-2, when the seat frame 13 needs to be reset, the adjusting spanner 2 needs to be rotated again, so that the limit clamping plate 54 avoids the seat frame 13 and is clamped into the limit groove 131, and the supporting mechanism enters the supporting state again.

Still further, as shown in fig. 2 and 3, the adjusting wrench 2 controls the rear bracket 5 such that the adjusting wrench 2 includes an operation portion 203 and a connection portion 202 formed at an end portion of the operation portion 203, the operation portion 203 is disposed along the axial direction of the support beam 1, the connection portion 202 is connected to the rear bracket 5, and the operation portion 203 is pulled to rotate the rear bracket 5 by the connection portion 202; the third screw hole 51 is preset on the rear bracket 5, the countersunk through hole 201 is preset on the connecting portion 202, and the first threaded fastener 10 is screwed into the third screw hole 51 on the rear bracket by passing through the countersunk through hole 201, so that the rotation connection between the adjusting wrench 2 and the rear bracket 5 is realized.

More specifically, the operation portion 203 and the connection portion 202 are made of plastic, the operation portion 203 is an arc plate attached to the outer wall of the support beam 1, and the arc plate is disposed along the length direction of the support beam 1; a pulling plate 204 is formed at the edge of the middle position of the arc plate, and the operation part 203 rotates around the supporting beam 1 so that the connection part 202 drives the rear bracket 5 to rotate; the arc-shaped plate is attached to the outer side of the supporting beam 1, so that the space is not occupied additionally, the supporting beam 1 is skillfully utilized as a rotating support, and a rotating shaft is not required to be arranged additionally.

As shown in fig. 10, a cover 17 is detachably disposed at the notch position of the open slot 136, and the cover 17 is used for closing the open slot 136, preventing dust from entering the open slot 136 and maintaining the integrity of the appearance of the seat frame 13.

As shown in fig. 6 and 8, the length of the front bracket 7 is 5-10cm, and the inclination angle of the front bracket 7 relative to the horizontal plane is 30-60 degrees; the length of the rear support 5 is 5-10cm, the inclination angle of the rear support 5 relative to the horizontal plane is 40-60 degrees, and the front support 7, the rear support 5 and the seat frame 13 form a triangle with small area and stable structure, so that the supporting mechanism occupies small space and has good supporting effect.

As shown in fig. 4 to 5, an elastic member, for example, a torsion spring 4 is disposed between the support beam 1 and the rear bracket 5, one elastic arm of the torsion spring 4 acts on the front bracket 7, and the front bracket 7 is kept relatively fixed, and the other elastic arm of the torsion spring 4 acts on the rear bracket 5, that is, abuts against the outer side of the rear bracket 5, so that the torsion spring 4 always has a rotation tendency of clamping the rear bracket 5 into the limiting groove 131, and thus the structure of the seat frame 13 is more stable when in a supporting state.

As shown in fig. 3-7, the tail end of the rear bracket 5 is sleeved on the supporting beam 1 through a first sleeve 53 formed integrally, in order to limit the rotation angle of the rear bracket 5, a first notch 52 is formed in the first sleeve 53, a first screw hole 101 is preset in the supporting beam 1, a first limit screw 11 is penetrated into the first screw hole 101, and the first limit screw 11 is positioned in the first notch 52; thus, the first limit screw 11 limits the axial movement of the rear bracket 5 on the support beam 1, and also limits the rotation range of the rear bracket 5 by cooperating with the first notch 52, i.e. the rotatable angle of the rear bracket 5 is determined by the length of said first notch 52.

Example 2: the difference between this embodiment and embodiment 1 is that, in addition to the front bracket 7 and the rear bracket 5 being directly mounted on the support beam 1, as shown in fig. 9, a shaft sleeve 8 may be added on the mounting surfaces of the support beam 1 and the front bracket 7 and the rear bracket 5, the shaft sleeve 8 is sleeved on the support beam 1, and an inner cylinder surface 83 at the end of the shaft sleeve 8 abuts against the end of the support beam 1; the shaft sleeve 8 is provided with a through hole a81 and a through hole b82, the first limit screw 11 passes through the through hole a81, and the second limit screw 12 passes through the through hole b82, so that the support beam 1 and the shaft sleeve 8 are fixed together, the support mechanism is compact in structure, the front support 7 is separated from the support beam 1 by the rear support 5, and abrasion between the front support and the rear support is reduced.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims (13)

1. A support mechanism for a seat, comprising: the support assembly comprises a seat frame (13), a support beam (1) and a support assembly arranged between the seat frame and the support beam, wherein the seat frame (13) comprises seat frame side rods (132) which are arranged in a bilateral symmetry mode, the support assembly is installed at one end of the support beam (1), the support assembly comprises a front support (7) which obliquely extends forwards from the support beam and a rear support (5) which obliquely extends backwards, the upper ends of the front support (7) and the rear support (5) are respectively connected to corresponding positions of the seat frame side rods (132), and the front support (7) and the rear support (5) are opposite to the seat frame side rods (132) to form a V-shaped support.

2. A support mechanism for a seat as claimed in claim 1, wherein: the seat frame side rod (132) is provided with a mounting groove (135) in advance, an insertion notch (134) which is preset and communicated is arranged below the mounting groove (135), the upper end of the front support (7) is connected with a support shaft (78), the support shaft (78) is provided with at least one tangential surface (77) so as to form a milling part (79) at the tangential surface, the thickness of the milling part (79) is smaller than the diameter of the support shaft (78), the seat frame side rod (132) enables the milling part (79) to be inserted into the mounting groove (135) along the tangential surface (77) direction through the insertion notch (134), and meanwhile, the milling part (79) cannot be separated from the insertion notch (134) when the mounting groove (135) deviates from the insertion direction.

3. A support mechanism for a seat as claimed in claim 2, wherein: an open slot (136) is formed in the upper end of the seat frame side rod (132), the lower end of the open slot (136) is communicated with the mounting groove (135) through a through notch (133), a mounting screw hole (76) is preset in the tangential plane (77), a threaded fastener (16) penetrates through the through notch (133) to be screwed into the mounting screw hole (76), and the length of the through notch (133) is larger than the diameter of the threaded fastener (16) so as to play a role in limiting rotation of the seat frame (13).

4. A support mechanism for a seat as claimed in claim 3, wherein: a sealing cover (17) is detachably arranged at the notch position of the open groove (136), and the sealing cover (17) is used for sealing the open groove (136).

5. A support mechanism for a seat as claimed in claim 1, wherein: the length of the front bracket (7) is 5-10cm, and the length of the rear bracket (5) is 5-10cm.

6. A support mechanism for a seat as claimed in claim 1, wherein: the inclination angle of the front bracket (7) relative to the horizontal plane is 30-60 degrees, and the inclination angle of the rear bracket (5) relative to the horizontal plane is 40-60 degrees.

7. A support mechanism for a seat as claimed in claim 1, wherein: the seat frame comprises a seat frame side rod (132), a rear support (5) and a seat frame (13), wherein a limiting groove (131) is formed in the corresponding position of the lower end of the seat frame side rod (132) matched with the rear support (5), the upper end of the rear support (5) is inserted into the limiting groove (131), and when the rear support (5) is separated from the limiting groove (131), the seat frame (13) rotates around the front support (7).

8. A support mechanism for a seat as claimed in claim 7, wherein: the limiting groove (131) is obliquely formed in the bottom surface of the seat frame side rod (132), a limiting clamping plate (51) matched with the limiting groove (131) is bent and formed at the upper end of the rear support (5), the rear support (5) is configured to rotate around the supporting beam (1), and when the rear support (5) rotates under the action of external force, the limiting clamping plate (51) enters or leaves the limiting groove (131).

9. A support mechanism for a seat as claimed in claim 8, wherein: an elastic member is provided between the support beam (1) and the rear bracket (5), and is configured to maintain the rear bracket (5) in a tendency to be inserted into the limiting groove (131).

10. A support mechanism for a seat as claimed in claim 1, wherein: the lower end of the front bracket (7) is fixed relative to the supporting beam (1) in the circumferential direction, or the front bracket (7) is configured to be rotatable about the supporting beam (1) within a range of 3-6 degrees.

11. A support mechanism for a seat as claimed in claim 9, wherein: the bearing assemblies are arranged at the left end and the right end of the supporting beam (1) in pairs.

12. A support mechanism for a seat as claimed in claim 1, wherein: the front bracket (7) and the rear bracket (5) are straight rods.

13. A seat, characterized by: comprising two symmetrical seat supports and the support mechanism for a seat according to claim 1, the two ends of the support beam (1) being each mounted on a respective seat support.