CN219782053U

CN219782053U - Armrest and seat

Info

Publication number: CN219782053U
Application number: CN202321042827.XU
Authority: CN
Inventors: 刘拥华; 许浩
Original assignee: UE Furniture Co Ltd
Current assignee: UE Furniture Co Ltd
Priority date: 2023-04-28
Filing date: 2023-04-28
Publication date: 2023-10-03
Anticipated expiration: 2033-04-28

Abstract

The present utility model provides an armrest comprising: the support arm is longitudinally arranged and configured to be connected to the side end of the seat part, and the top end of the support arm is provided with a connecting support and a panel assembly; the panel assembly is configured to support the elbow of a human body and is arranged on the supporting arm, and comprises an armrest panel and an armrest bottom plate, wherein the armrest bottom plate is arranged on a connecting inclined plane at the top of the connecting support; the handrail panel has two states of a horizontal supporting position and an inclined supporting position; the handrail panel can be switched between the two states when rotating along the connecting inclined plane; in the horizontal supporting position, at least the rear half part of the handrail supporting surface at the top end of the handrail panel tends to be horizontal; when the armrest panel is rotated from the horizontal support position to the inclined support position, the rear half of the armrest support surface of the armrest panel is inclined downward, the rear portion of the armrest panel is forward, the front portion is rearward, and the armrest panel assumes an upwardly inclined state.

Description

Armrest and seat

Technical Field

The utility model relates to the field of seats, in particular to an armrest and a seat.

Background

Seats are an indispensable tool for people's life, study and work. People may sit on the seat for a long time to perform various matters, so the comfort of the seat is very important. Armrests play an important role as an integral part of the seat to provide comfort; the armrests of the traditional seat are of a fixed structure, have no adjusting function and can not be lifted, so that the traditional seat can not adapt to people with different body heights; and can not rotate, so that the hand placing habit of different people can not be adapted, and the comfort requirement of people can not be met. In order to enrich the functions of handrails, the conventional seats are correspondingly provided with handrails which can rotate, lift and move, so that the seat is convenient for a user to adjust.

The utility model of publication No. CN 217723056U provides a 360-degree double-shaft rotary armrest to realize wide-range adjustment of the angle of the armrest in the horizontal direction, and the armrest is connected with an adjusting arm, wherein the adjusting arm is connected to the top of a supporting arm so as to meet the use habits of different consumers. However, the rotation and the movement of the armrests are all adjusted in the horizontal plane, and the backrest of most of the existing chairs can be adjusted in a tilting manner relative to the seat part so that the user can use the chair more comfortably, and the user can conveniently use the chair daily or lie down for rest; however, the backrest and the armrests are two separate components, and the armrests are generally disposed on both sides of the seat portion, so that when a person adjusts the elevation angle of the seat, the armrests cannot be adjusted synchronously with the backrest, resulting in a significant reduction in comfort.

The utility model disclosed in publication number CN 113229664A provides a handrail capable of rotating around a bracket to adjust a handrail arm, and the elbow support body caters for the elbow of a human body during the rotation of the handrail; in the rotating process, the human arm is attached, and the use is more comfortable. The utility model well solves the problem of synchronous angle adjustment of the armrest and the backrest, and after the armrest arm rotates, the armrest arm needs to be fixed by relying on the locking rotating mechanism, the locking rotating mechanism has a complicated structure and is easy to damage, and the cost is increased; moreover, the armrest provided by the utility model cannot be adjusted in a large range in the horizontal plane, so that the armrest has poor practicability.

In view of the above, there is a need for a chair armrest that provides effective support for the user's arms and elbows for different hands-free habits and different use conditions.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide the handrail, wherein when the handrail is subjected to angle adjustment on the horizontal plane by rotating the handrail panel, the handrail panel also generates angle change in the vertical direction along the connecting inclined plane; meanwhile, the front and back positions of the armrests can be adjusted, so that the armrests have various supporting states.

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

an armrest, comprising: the support arm is longitudinally arranged and configured to be connected to the side end of the seat part, and the top end of the support arm is provided with a connecting support and a panel assembly; a panel assembly configured to support a human elbow, mounted on the support arm; the panel assembly comprises an armrest panel and an armrest bottom plate, and the armrest bottom plate is arranged on a connecting inclined plane at the top of the connecting support; a rotating structure is arranged between the connecting support and the armrest bottom plate so that the armrest panel can be circumferentially rotated and adjusted relative to the supporting arm; the rotating structure comprises a shaft joint part and a rotating limiting groove, wherein the shaft joint part is arranged on the connecting support, the rotating limiting groove is arranged on the handrail bottom plate, the shaft joint part and the connecting support are kept relatively fixed in the circumferential direction, the shaft joint part is positioned in the rotating limiting groove, and an elastic positioning mechanism is arranged between the shaft joint part and the rotating limiting groove; the handrail panel has two states of a horizontal supporting position and an inclined supporting position; the handrail panel can be switched between the two states when rotating along the connecting inclined plane; and after the handrail panel rotates relative to the connecting support, the handrail panel is positioned at a corresponding position through the elastic positioning mechanism.

Preferably, the handrail bottom plate is closely attached to a connecting inclined plane of the connecting support, wherein the front part of the connecting inclined plane is high and the rear part of the connecting inclined plane is low, and the inclination angle of the connecting inclined plane is in the interval of 12-18 degrees; in the horizontal supporting position, at least the rear half part of the handrail supporting surface at the top end of the handrail panel tends to be horizontal; when the armrest panel is rotated from the horizontal support position to the inclined support position, the rear half of the armrest support surface of the armrest panel is inclined downward. The two states of the handrail panel meet the requirements of most use scenes of users, the elbows of the users are supported conveniently, and the design is more comprehensive.

Preferably, the cross section of the bottom of the connecting support is elliptical, and the bottom of the connecting support is connected with the supporting arm; the top surface of the connecting support is elliptical, but the elliptical area of the top surface of the connecting support is larger than that of the bottom, the ellipse of the top surface is inclined relative to the horizontal plane, and the top surface of the connecting support is provided with a bolt hole for the installation of the handrail bottom plate. By installing the handrail panel on the connecting inclined plane, the handrail panel with low front and high rear has two working states of a horizontal supporting position and an inclined supporting position.

Preferably, the cross section of the bottom of the connecting support is elliptical, and the bottom of the connecting support is connected with the supporting arm; the top surface of the connecting support is elliptical, but the elliptical area of the top surface of the connecting support is larger than that of the bottom, the ellipse of the top surface is inclined relative to the horizontal plane, and the top surface of the connecting support is provided with a bolt hole for the installation of the handrail bottom plate. The structure is provided with the angle adjustment, so that the handrail panel is clung to the arm more closely, and the user can experience more comfort in use.

Preferably, the front part of the panel assembly is thinner and the rear part is thicker, and the handrail panel is in a horizontal supporting state in the horizontal supporting position; in the inclined support position, the rear portion of the armrest panel is forward and the front portion is rearward, the armrest panel exhibiting an upwardly inclined condition; the rear part of the top is provided with a backward inclined bearing body which inclines backward and obliquely. Through the frictional force effect between fixture block and the spacing groove, fix the handrail in corresponding position, realize the handrail to the demand of stability when different states.

Preferably, a positioning plate is arranged in the handrail bottom plate, the rotation limiting groove is arranged on the positioning plate, the shaft joint part is provided with a matching end matched with the groove wall of the rotation limiting groove, and the elastic positioning mechanism comprises a spring, a clamping block which stretches out and draws back at the matching end of the shaft joint part and a plurality of limiting grooves which are arranged on the groove wall of the rotation limiting groove; when the locating plate rotates synchronously with the armrest bottom plate, the clamping blocks are switched in different limiting grooves and clamped at corresponding positions. When the position of the handrail in the front-back direction is switched, the handrail is fixed at the corresponding position through the interaction of friction force between the sliding groove and the salient points, so that the requirement of the handrail on the stability after the front-back position adjustment is realized.

Preferably, the upper surface of the handrail bottom plate is provided with a long groove along the length direction of the handrail bottom plate, the positioning plate is positioned in the long groove, a sliding positioning mechanism is arranged between the positioning plate and the long groove, and the sliding positioning mechanism comprises a positioning groove and a salient point matched with the positioning groove; the positioning grooves are arranged on two sides of the long groove, the front end of the positioning plate is provided with a cavity, the cavity is internally provided with a pressure spring, the salient points are propped in the positioning grooves under the action of the pressure spring, and when the handrail bottom plate moves back and forth relative to the positioning plate, the salient points are switched in different positioning grooves and clamped at corresponding positions; the sliding locating plate is positioned in the long groove, the handrail bottom plate is provided with a sliding groove which is penetrated up and down, and the shaft joint part passes through the sliding groove and is fixed on the connecting support. Through the sliding groove which penetrates up and down, the front and back sliding of the whole panel assembly is realized.

Preferably, the top surface of the connecting support is provided with a connecting seat, the bottom surface of the shaft joint part is provided with a slot, and the shape of the connecting seat is configured to ensure that the connecting seat and the shaft joint part are kept circumferentially fixed; the center department of locating plate leaves the hole of dodging that supplies the connecting seat to pass, and the locating plate stacks on the handrail bottom plate and when both place on the connection support, the connecting seat upwards passes the elongated slot and dodges the hole and expose on the locating plate, and the coupling portion cup joints together through the slot with the connecting seat, and wherein the top surface of connecting seat is equipped with the screw hole, and after coupling portion and connecting seat were in the same place, through the screw locking to make handrail bottom plate and locating plate install on the connection support. Through the screw hole, dodge hole and slot, realize the connection of integration between coupling portion, connecting seat, connection support and the locating plate, when the handrail takes place to rotate, these subassemblies take place the change of position as a whole.

Preferably, the positioning plate is connected with the shaft joint part through a bolt structure, and is kept relatively fixed with the connecting support in the front-rear direction. And the bolt structure is utilized to realize the requirement on stability when the positioning plate is connected with the shaft connection part.

The design starting point, the idea and the beneficial effects of the utility model adopting the technical scheme are as follows:

through the design of the inclined plane at the top of the connecting bracket, when the handrail rotates circumferentially, the handrail has two states of a horizontal supporting position and an inclined supporting position, and in the horizontal supporting position, the handrail panel at the top of the panel assembly tends to be in a horizontal state, and the handrail can be used as a conventional handrail; when the armrest panel rotates from the horizontal supporting position relative to the supporting body, the angle of the armrest panel at the top of the panel assembly is changed at the same time, so that the armrest has various supporting modes.

Drawings

FIG. 1 is a front view of a handrail panel in a horizontal support position in an embodiment of the utility model;

FIG. 2 is an oblique top view of the present utility model with the armrest panel removed;

FIG. 3 is a top view of the internal connection assembly of the present utility model;

FIG. 4 is a top view of the present utility model after removal of the panel assembly;

FIG. 5 is an exploded view of the connection of the panel assembly to the support body in an embodiment of the utility model;

fig. 6 is a side view of the panel assembly of the present utility model.

FIG. 7 is a front view of the armrest panel in an angled support position in an embodiment of the present utility model;

the reference numerals are as follows: 1-supporting arm, 2-connecting bracket, 3-panel assembly, 3 a-handrail panel, 3 b-handrail bottom plate, 4-connecting inclined plane, 5-rotating structure, 5 a-coupling part, 5 b-rotation limit groove, 6-elastic positioning mechanism, 6 a-spring, 6 b-fixture block, 6 c-limit groove, 7-bolt hole, 8-back inclined supporting body, 9-positioning plate, 10-long groove, 11-sliding positioning mechanism, 11 a-positioning groove, 11 b-salient point, 12-cavity, 13-pressure spring, 14-sliding groove, 15-connecting seat, 16-slot and 17-avoiding hole.

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, without conflict, the embodiments of the present utility model and features in the embodiments may be combined with each other.

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

as shown in fig. 1-7, the utility model provides an armrest, which comprises a longitudinal supporting arm 1, a connecting bracket 2 and an armrest panel 3, wherein the top end of the supporting arm 1 is provided with the connecting bracket 2 and the panel assembly 3; and the panel assembly 3 is mounted on the support arm 1 through the connection bracket 2 and comprises an armrest panel 3a and an armrest bottom plate 3b, wherein the armrest bottom plate 3b is mounted on the connection inclined plane 4 at the top of the connection bracket 2. The function of the present utility model to provide a handrail will be specifically described below:

in order to meet the use requirements of users in various use situations, the armrest provided by the utility model not only can be rotationally adjusted relative to the support arm 1 in the circumferential direction, but also can be slidably adjusted relative to the support arm 1 in the front-rear direction.

As shown in fig. 2 and 3, in order to realize the circumferential rotation adjustment of the armrest panel 3a, a rotation structure 5 is arranged between the connecting bracket 2 and the armrest bottom plate 3b to realize the circumferential rotation of the armrest panel 3a relative to the support arm 1; the rotating structure 5 comprises a shaft connection part 5a and a rotation limiting groove 5b, the shaft connection part 5a is arranged in the rotation limiting groove 5b, an elastic positioning mechanism 6 is arranged between the shaft connection part 5a and the rotation limiting groove 5b, the elastic positioning mechanism 6 comprises a spring 6a, a clamping block 6b and a limiting groove 6c, and the shaft connection part 5a realizes the position fixation of the handrail panel 3a in rotation through the elastic positioning mechanism 6; the rotation limiting grooves 5b are provided with a plurality of limiting grooves 6c which are distributed along a 220-degree arc, clamping blocks 6b are arranged at the front ends of the shaft connection parts 5a, springs 6a are arranged between the clamping blocks 6b and the bodies of the shaft connection parts 5a, and the corresponding positions of the clamping blocks 6b clamped in the rotation limiting grooves 5b are realized by deformation of the springs 6 a.

As shown in fig. 5, the connection bracket 2 and the shaft connection portion 5a have the following connection relationship: the bottom surface of the shaft connection part 5a is provided with a slot 16, the top surface of the connection support 2 is provided with a connection seat 15, wherein the connection seat 15 protrudes out of the connection support 2, and the shape of the connection seat 15 is configured to keep the connection seat and the shaft connection part 5a fixed in the circumferential direction, for example, in the embodiment, as shown in fig. 4, the shape approximates to a cross; in the vertical direction, the armrest bottom plate 3b is mounted on the connection support 2, and the connection seat 15 passes through the armrest bottom plate 3b to expose the upper half part, and is sleeved with the slot 16 at the bottom of the shaft connection part 5a, and after the sleeve is sleeved, the shaft connection part 5a and the connection seat 15 are locked by a screw.

If the armrest panel 4a has only a function of rotating left and right, the rotation limiting groove 5b may be directly mounted on the connection bracket 2. But the handrail provided by the utility model also has the function of sliding back and forth.

In order to solve the problem, a long groove 10 is arranged on the handrail bottom plate 3b, wherein a positioning plate 9 is arranged in the long groove 10, the shape is rectangular, the width of the long groove 10 is the same as that of the positioning plate 9, so that the positioning plate 9 can slide relative to the handrail bottom plate 3b in the long groove 10, the positioning plate 9 and the handrail bottom plate 3b are clamped between the shaft joint part 5a and the connecting support 2, and the positioning plate 9 is kept relatively static with the connecting support 2 all the time when the handrail panel 3a moves; the positioning plate 9 is provided with a groove, and a rotation limiting groove 5b is arranged in the groove, wherein the rotation limiting groove 5b is in the shape of an arc, and the arc edge is tangent with the positioning plate 9; with the above structure, the armrest panel 3a is slid forward and backward based on the support arm 1.

In this embodiment, the components around the positioning plate 9 are more and finer, and the following description will be given about the state of the positioning plate 9 and the connection state of the peripheral components:

the positioning plate 9 is arranged in a long groove 10 arranged along the length direction of the handrail bottom plate, wherein the bottom of the long groove 10 is provided with a sliding groove 14 which penetrates up and down, the shaft joint part 2 is arranged on the positioning plate 9 and simultaneously passes through the sliding groove 14 to be fixed on the connecting support 2, and meanwhile, the shaft joint part 2 is fixed with the positioning plate 9 through a rotation limiting groove 5 b. As shown in fig. 4, the cross section of the top of the connection bracket 2 is elliptical, the ellipse of the top surface is inclined relative to the horizontal surface, and the top surface of the connection bracket 2 is provided with a bolt hole 7 for fixing the shaft connection part 5a and a connection seat 15; the center department of locating plate 9 leaves the dodging hole 17 that supplies connecting seat 15 to pass, locating plate 9 stacks on handrail bottom plate 3b and both when placing on connecting support 2, connecting seat 15 upwards passes elongated slot 10 and dodges hole 17 and exposes on locating plate 9, coupling portion 5a cup joints together through slot 16 with connecting seat 15, wherein the top surface of connecting seat 15 is equipped with bolt hole 7, coupling portion 5a is in the same place with connecting seat 15 after, pass slot 16 through the screw and lock, thereby make coupling portion 5a and locating plate 9 install on connecting support 2, make connecting support 2, locating plate 9, coupling portion 5a combine as an organic wholely.

As shown in fig. 3, in view of realizing the forward and backward sliding of the armrest panel 3a and the fixation of the position after the sliding, the positioning plate 9 is installed inside the long groove 10, and the forward and backward sliding of the armrest panel 3a is realized by the slide positioning mechanism 11; the sliding positioning mechanism 11 comprises positioning grooves 11a and protruding points 11b, the positioning grooves 11a are arranged on two sides of the long groove 10, the protruding points 11b are positioned in a cavity 12 at the front end of the positioning plate 9, and the corresponding positions of the protruding points 11a clamped in the positioning grooves 11a are realized in the cavity 12 through the protruding points 11b and the pressure springs 13; when the handrail panel 3a slides forwards and backwards, the protruding points 11b on the positioning plate 9 fixed by the connecting support 2 are clamped at different positions of the positioning grooves 11a positioned at the two sides of the handrail bottom plate 3 b; at the same time, the connecting bracket 2, the positioning plate 9 and the shaft connection part 5a are always kept as a whole, the handrail bottom plate 3b is changed relative to the occurrence of the position change, and the positioning plate 9 realizes the selection of the sliding position through the positioning groove 11 a.

Depending on the angle of rotation of the armrest panel 3a, in which the armrest panel 3a has two states, a horizontal support position and an inclined support position, it is possible to switch between the two states when the armrest panel 3a rotates along the connection slope 4, and to position the armrest panel 3a in the corresponding position by the elastic positioning mechanism 6. Next, two states of the armrest panel 4a will be described:

as shown in fig. 1, the handrail bottom plate 3b is tightly attached to the connection inclined plane 4 of the connection bracket 2, wherein the connection inclined plane 4 is higher at the front and lower at the back, the inclination angle of the inclined plane is 15 °, the front part of the panel assembly 3 is thinner, the rear part is thicker, and after the two are combined, the handrail panel 3a is in a horizontal supporting state at the occurrence position of the horizontal supporting position;

similarly, as shown in fig. 7, in the inclined support position, the rear portion of the armrest panel 3a is forward and the front portion is rearward, and the armrest panel 3a assumes an upwardly inclined state. Under the horizontal supporting position, comfortable arm supporting experience can be brought to a user in an office scene; in the inclined support position, the upwardly inclined armrest panel 3a allows a user to have a comfortable use experience by leaning on the armrest panel 3a when lifting his/her arms, such as reading a book and using a mobile phone. At the same time, as shown in fig. 6, the rear part of the top of the armrest panel 3a is provided with a backward inclined support 8 inclined backward, which ensures that the user's arm leans against the armrest panel 3a more stably during use, thus achieving a better comfort and stability.

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

1. An armrest, comprising:

the support arm is longitudinally arranged and configured to be connected to the side end of the seat part, and the top end of the support arm is provided with a connecting support and a panel assembly;

a panel assembly configured to support a human elbow, mounted on the support arm; the panel assembly comprises an armrest panel and an armrest bottom plate, and the armrest bottom plate is arranged on a connecting inclined plane at the top of the connecting support; a rotating structure is arranged between the connecting support and the armrest bottom plate so that the armrest panel can be circumferentially rotated and adjusted relative to the supporting arm; the rotating structure comprises a shaft joint part and a rotating limiting groove, wherein the shaft joint part is arranged on the connecting support, the rotating limiting groove is arranged on the handrail bottom plate, the shaft joint part and the connecting support are kept relatively fixed in the circumferential direction, the shaft joint part is positioned in the rotating limiting groove, and an elastic positioning mechanism is arranged between the shaft joint part and the rotating limiting groove; the handrail panel has two states of a horizontal supporting position and an inclined supporting position; the handrail panel can be switched between the two states when rotating along the connecting inclined plane; and after the handrail panel rotates relative to the connecting support, the handrail panel is positioned at a corresponding position through the elastic positioning mechanism.

2. The handrail of claim 1, wherein: the handrail bottom plate is tightly attached to the connecting inclined plane of the connecting support, wherein the front part of the connecting inclined plane is high and the rear part of the connecting inclined plane is low, and the inclination angle of the connecting inclined plane is in the interval of 12-18 degrees; in the horizontal supporting position, at least the rear half part of the handrail supporting surface at the top end of the handrail panel tends to be horizontal; when the armrest panel is rotated from the horizontal support position to the inclined support position, the rear half of the armrest support surface of the armrest panel is inclined downward.

3. The handrail of claim 1, wherein: the cross section of the bottom of the connecting support is elliptical, and the bottom of the connecting support is connected with the supporting arm; the top surface of the connecting support is elliptical, but the elliptical area of the top surface of the connecting support is larger than that of the bottom, the ellipse of the top surface is inclined relative to the horizontal plane, and the top surface of the connecting support is provided with a bolt hole for the installation of the handrail bottom plate.

4. The handrail of claim 2, wherein: wherein the front portion of the panel assembly is thinner and the rear portion is thicker, and the armrest panel assumes a horizontally supported condition in the horizontally supported position; in the inclined support position, the rear portion of the armrest panel is forward and the front portion is rearward, the armrest panel exhibiting an upwardly inclined condition; the rear part of the top is provided with a backward inclined bearing body which inclines backward and obliquely.

5. The handrail of claim 1, wherein: the armrest bottom plate is internally provided with a positioning plate, the rotation limiting groove is arranged on the positioning plate, the shaft joint part is provided with a matching end matched with the groove wall of the rotation limiting groove, and the elastic positioning mechanism comprises a spring, a clamping block which stretches out and draws back at the matching end of the shaft joint part and a plurality of limiting grooves which are arranged on the groove wall of the rotation limiting groove; when the locating plate rotates synchronously with the armrest bottom plate, the clamping blocks are switched in different limiting grooves and clamped at corresponding positions.

6. The handrail as claimed in claim 5, wherein: the upper surface of the handrail bottom plate is provided with a long groove along the length direction of the handrail bottom plate, the positioning plate is positioned in the long groove, a sliding positioning mechanism is arranged between the positioning plate and the long groove, and the sliding positioning mechanism comprises a positioning groove and a salient point matched with the positioning groove; the positioning grooves are arranged on two sides of the long groove, the front end of the positioning plate is provided with a cavity, the cavity is internally provided with a pressure spring, the salient points are propped in the positioning grooves under the action of the pressure spring, and when the handrail bottom plate moves back and forth relative to the positioning plate, the salient points are switched in different positioning grooves and clamped at corresponding positions; the sliding locating plate is positioned in the long groove, the handrail bottom plate is provided with a sliding groove which is penetrated up and down, and the shaft joint part passes through the sliding groove and is fixed on the connecting support.

7. The handrail of claim 6, wherein: the top surface of the connecting support is provided with a connecting seat, the bottom surface of the shaft connecting part is provided with a slot, and the shape of the connecting seat is configured to ensure that the connecting seat and the shaft connecting part are kept circumferentially fixed; the center department of locating plate leaves the hole of dodging that supplies the connecting seat to pass, and the locating plate stacks on the handrail bottom plate and when both place on the connection support, the connecting seat upwards passes the elongated slot and dodges the hole and expose on the locating plate, and the coupling portion cup joints together through the slot with the connecting seat, and wherein the top surface of connecting seat is equipped with the bolt hole, and after coupling portion and connecting seat were in the same place, through the screw locking to make handrail bottom plate and locating plate install on the connection support.

8. The handrail of claim 7, wherein: the positioning plate is connected with the shaft connection part through a bolt structure, and is kept relatively fixed with the connecting support in the front-rear direction.