CN221179933U - Chair frame of electric chair - Google Patents

Abstract

The utility model relates to the technical field of furniture, in particular to a chair frame and a base of an electric chair; a main lever mounted on the base; a seat plate mounted on the main lever and located above the main lever; a driving mechanism mounted on a lower end surface of the seat plate; the linkage type hinge mechanism is movably arranged on the seat plate and is connected with the output end of the driving mechanism; the leg support bracket is arranged at one end of the linkage type hinge mechanism, which is close to the front of the seat plate; the chair back bracket is detachably arranged at one end of the linkage type hinge mechanism, which is close to the rear of the seat plate; the driving mechanism can drive the linkage type hinge mechanism to extend or retract, so as to adjust the lifting or retracting of the leg support bracket and adjust the angle between the chair back bracket and the seat plate. The driving mechanism and the linkage type hinge mechanism are directly arranged on the seat board, the linkage type hinge mechanism can directly adjust the leg support bracket and the chair back bracket, the complex movement mechanism of the traditional electric chair is simplified, the structure is simpler, the installation is simpler, and the manufacturing cost of the product is lower.

Description

Chair frame of electric chair

Technical Field

The utility model relates to the technical field of furniture, in particular to a chair frame of an electric chair.

Background

Office chairs are various chairs equipped for convenience in daily work and social activities; the narrow office chair refers to a back rest chair on which a person sits when performing a tabletop work in a sitting posture. Office chairs generally comprise casters, chair legs, air bars, chassis, seat, armrests, chair back seat connection, chair back, lumbar pillow, headrest and other structures. The existing office chairs generally have the functions of moving, rotating, backrest adjusting, leg supporting and the like. Along with the continuous improvement of the living standard of people, the requirements of people on office chairs are also higher and higher, and the office chairs with electric adjustment are more and more popular with people.

The existing electric office chair is provided with an electric mechanism for adjusting a backrest, so that the electric office chair has more complicated structures except a chassis, an air rod, a chair seat and the like, and the product installation is also more complicated, and the overall cost is higher.

Disclosure of utility model

The utility model aims to provide a chair frame of an electric chair, which aims to solve the technical problems of complex overall structure, complicated installation and higher manufacturing cost in the prior art.

To achieve the above object, the present utility model provides a chair frame of an electric chair, comprising:

A base;

A main lever mounted on the base;

A seat plate mounted on the main lever and located above the main lever;

a driving mechanism mounted on a lower end surface of the seat plate;

The linkage type hinge mechanism is movably arranged on the seat plate and is connected with the output end of the driving mechanism;

the leg support bracket is arranged at one end of the linkage type hinge mechanism, which is close to the front of the seat plate;

The chair back bracket is detachably arranged at one end of the linkage type hinge mechanism, which is close to the rear of the seat plate;

the driving mechanism can drive the linkage type hinge mechanism to extend or retract, so as to adjust the lifting or retracting of the leg support bracket and adjust the angle between the chair back bracket and the seat plate.

Preferably, both ends of the seat board are bent downwards to form bending parts, and both ends of the main rod are respectively connected with the two bending parts.

Preferably, connecting pieces are arranged at two ends of the main rod, a first mounting hole is formed in the connecting piece, and a second mounting hole corresponding to the first mounting hole is formed in the bending part; the connecting piece passes through the first mounting hole and the second mounting hole so as to connect and fix the bending part and the connecting piece.

Preferably, the base comprises swivel chair legs, pulleys, an air bar and an adjusting handle; the swivel chair leg comprises a plurality of supporting legs, each supporting leg is provided with a pulley, the air rod is arranged on the swivel chair leg, the main rod is rotatably sleeved outside the air rod, the adjusting end of the air rod protrudes out of the main rod, and the adjusting handle is arranged on the main rod and located right above the adjusting end of the air rod.

Preferably, the linkage hinge mechanism comprises a connecting cross rod, a left hinge assembly and a right hinge assembly, wherein the left hinge assembly and the right hinge assembly are arranged at intervals and are movably mounted on the seat board, the connecting cross rod is connected with the output end of the driving mechanism, the two ends of the connecting cross rod are respectively connected with the left hinge assembly and the right hinge assembly, and the left hinge assembly and the right hinge assembly are identical in structure.

Preferably, the left hinge assembly comprises a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a long rod and a left connecting plate; one end of the first connecting rod and one end of the second connecting rod are rotatably connected with the seat plate, the other end of the first connecting rod is rotatably connected with one end of the third connecting rod, the other end of the second connecting rod is rotatably connected with one end of the fourth connecting rod, the third connecting rod is rotatably connected with the fourth connecting rod, and the other end of the third connecting rod and the other end of the fourth connecting rod are connected with the leg support bracket; one end of the long rod is rotatably connected with the second connecting rod, the other end of the long rod is rotatably connected with the left connecting plate, and the left connecting plate is rotatably connected with the seat plate and the chair back bracket; one end of the connecting cross rod is connected with the second connecting rod.

Preferably, the left hinge assembly further comprises a fixing plate, wherein one end of the first connecting rod and one end of the second connecting rod are rotatably connected with the fixing plate, and the fixing plate is fixedly connected with the seat plate.

Preferably, a left mounting plate is arranged on the left side of the chair back support, a slot is formed in the left mounting plate, and the left connecting plate is inserted into the slot.

Preferably, the driving mechanism comprises a driving motor, a screw and a movable shell, wherein the driving motor is connected with one end of the screw and used for driving the screw to rotate, the movable shell is sleeved on the screw and is in threaded connection with the screw, the driving motor is installed on the seat plate, and one end, far away from the driving motor, of the movable shell is connected with the linkage type hinge mechanism.

Preferably, a mounting seat is mounted on the lower end face of the seat plate, and the driving motor is mounted on the mounting seat.

The chair frame of the electric chair has at least the following beneficial effects: the driving mechanism and the linkage type hinge mechanism are directly arranged on the seat board, the linkage type hinge mechanism can directly adjust the leg support bracket and the chair back bracket under the action of the driving mechanism, the complex movement mechanism of the traditional electric chair is simplified, the structure is simpler, the installation is simpler, and the manufacturing cost of the product is lower.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the structure of a chair frame of the electric chair of the present utility model;

FIG. 2 is a schematic view of the extension structure of the electric chair of the present utility model with the seat plate removed from the chair frame;

FIG. 3 is a schematic view of the chair frame of the electric chair of the present utility model in a retracted configuration with the seat pan removed;

FIG. 4 is a schematic view of the structure of the seat plate of the present utility model;

FIG. 5 is a schematic structural view of the main lever of the present utility model;

FIG. 6 is a schematic view of the structure of the main lever and the base of the present utility model;

FIG. 7 is a schematic view of the drive mechanism and linkage hinge structure of the present utility model;

FIG. 8 is a schematic view of the left hinge assembly of the present utility model;

FIG. 9 is a schematic view of the chair back support of the present utility model;

Fig. 10 is a schematic structural view of the left mounting plate of the present utility model.

In the accompanying drawings: 1-base, 11-swivel chair leg, 111-landing leg, 12-pulley, 13-gas lever, 14-adjustment handle, 2-mobile jib, 21-connection piece, 22-first mounting hole, 3-bedplate, 31-kink, 32-second mounting hole, 4-actuating mechanism, 41-driving motor, 42-screw, 43-movable shell, 5-coordinated hinge mechanism, 51-connection horizontal pole, 52-left hinge assembly, 521-first connecting rod, 522-second connecting rod, 523-third connecting rod, 524-fourth connecting rod, 525-long pole, 526-left connecting plate, 527-fixed plate, 53-right hinge assembly, 6-leg support, 7-back support, 71-left mounting plate, 711-slot, 8-mount pad.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1 to 3, a chair frame of an electric chair includes a base 1, a main rod 2, a seat plate 3, a driving mechanism 4, a linkage hinge mechanism 5, a leg support bracket 6 and a back support bracket 7.

The base 1 is a base of the chair frame and is used for being placed on the bottom surface to support other parts of the chair frame. The main rod 2 is arranged on the base 1, the main rod 2 is of a strip rod structure, the main rod 2 is horizontally arranged relative to the bottom surface, and the middle position is arranged on the base 1. The seat plate 3 is mounted on the main lever 2 and is located above the main lever 2. In the finished electric chair, the seat cushion is mounted on the upper end of the seat plate 3 for seating by a user. A driving mechanism 4 is mounted on the lower end surface of the seat plate 3, and the driving mechanism 4 is used for driving the linkage hinge mechanism 5 to extend or retract. The linkage type hinge mechanism 5 is movably arranged on the seat board 3 and is positioned below the seat board 3; the linkage type hinge mechanism 5 is connected with the output end of the driving mechanism 4. The leg support bracket 6 is arranged at one end of the linkage hinge mechanism 5 near the front of the seat plate 3, and the leg support bracket 6 is used as a main body bracket of a leg support in the finished electric chair and supports the legs of a user in use. The chair back support 7 is detachably arranged at one end of the linkage hinge mechanism 5 close to the rear of the seat plate 3, and the chair back support 7 is used as a main body support of a backrest in a finished electric chair, so that the back of a user can lean on and support the upper half of the user during use. The drive mechanism 4 may drive the linked hinge mechanism 5 to extend or retract. When the driving mechanism 4 drives the linkage type hinge mechanism 5 to extend, the linkage type hinge mechanism 5 can drive the leg support bracket 6 to lift, and simultaneously, the angle between the chair back bracket 7 and the seat plate 3 is adjusted to be large, so that the leg support bracket 6 can support the legs of a user, and meanwhile, the chair back bracket 7 can support the user lying down. By setting the driving mechanism 4 or the linkage type hinge mechanism 5, the effect of the sofa with zero gravity can be realized.

The existing electric office chair is required to be provided with an electric mechanism for adjusting the backrest, so that the electric office chair has more complicated structures except for a chassis, an air rod 13, a chair seat and the like, and the product installation is also more complicated, and the overall cost is higher. According to the technical scheme, the driving mechanism 4 and the linkage type hinge mechanism 5 are directly arranged on the seat board 3, the linkage type hinge mechanism 5 can directly adjust the leg support bracket 6 and the chair back bracket 7 under the action of the driving mechanism 4, the complex movement mechanism of the traditional electric chair is simplified, the structure is simpler, the installation is simpler, and the manufacturing cost of the product is lower.

Referring to fig. 4, further, both ends of the seat plate 3 are bent downward to form bending portions 31, and both ends of the main rod 2 are respectively connected with the two bending portions 31. The seat board 3 is a plate-shaped main body, the left end and the right end of the seat board are downwards bent to form bending parts 31, and the two bending parts 31 are parallel to each other and perpendicular to the horizontal plane. The two ends of the main rod 2 are respectively arranged and fixed on the inner side surfaces of the two bending parts 31, namely the main rod 2 is positioned between the two bending parts 31. The structure of the seat board 3 is arranged in such a way that the seat board can be conveniently installed and fixed with the main rod 2, and the assembly of the driving mechanism 4 and the linkage type hinge mechanism 5 can be conveniently realized.

Referring to fig. 5, specifically, connecting pieces 21 are disposed at two ends of the main rod 2, and the width and length of the connecting pieces 21 are greater than the width and length of the cross section of the main rod 2. The end of the main rod 2 is connected with the middle position of the connecting sheet 21, and a first mounting hole 22 is formed in the connecting sheet 21, specifically, two first mounting holes 22 are formed in two sides of the main rod 2 by the connecting sheet 21. The bending portion 31 is provided with second mounting holes 32 corresponding to the first mounting holes 22, and the positions and the numbers of the second mounting holes are corresponding to each other. The connecting piece passes through the first mounting hole 22 and the second mounting hole 32 to connect and fix the bending part 31 and the connecting piece 21, and the connecting piece can be a locking piece such as a common bolt, a screw or the like. Through setting up connection piece 21 and seting up first mounting hole 22 and second mounting hole 32, can conveniently be fixed mobile jib 2 and bedplate 3 connection, and the installation is simple, and structural stability is high.

Referring to fig. 6, the base 1 includes swivel legs 11, pulleys 12, an air bar 13, and an adjusting handle 14. Swivel chair leg 11 includes a plurality of legs 111, each leg 111 having a pulley 12 mounted thereon. The air bar 13 is arranged on the swivel chair leg 11, the main bar 2 is rotatably sleeved outside the air bar 13, and the adjusting end of the air bar 13 protrudes out of the main bar 2. An adjusting handle 14 is mounted on the main rod 2 directly above the adjusting end of the air rod 13. The pulley 12 and the swivel chair legs 11 can realize the movement of the electric chair; the air bar 13 is used for adjusting the horizontal height of the seat board 3, and the adjusting handle 14 is used for adjusting the air bar 13 by a user; the main rod 2 can be actively sleeved outside the air rod 13, so that the seat plate 3 can rotate relative to the base 1.

Referring to fig. 7, further, the ganged hinge mechanism 5 includes a connecting rail 51, a left hinge assembly 52, and a right hinge assembly 53. The left hinge assembly 52 and the right hinge assembly 53 are identical in structure and symmetrically arranged, wherein the left hinge assembly 52 is movably mounted on the seat plate 3, and the right hinge assembly 53 is also movably mounted on the seat plate 3. The connecting cross rod 51 is connected to the output end of the driving mechanism 4, and both ends are connected to the left hinge assembly 52 and the right hinge assembly 53, respectively. The drive mechanism 4 may push or pull the connecting rail 51 forward or backward. When the drive mechanism 4 pushes the connecting cross bar 51 forward, the left hinge assembly 52 and the right hinge assembly 53 are extended synchronously, thereby lifting the leg rest bracket 6 and enlarging the angle between the seat back bracket 7 and the seat plate 3. When the driving mechanism 4 pulls the connecting cross bar 51 backward, the left hinge assembly 52 and the right hinge assembly 53 retract synchronously, and the leg rest bracket 6 is retracted and the angle between the seat back bracket 7 and the seat plate 3 is reduced. The linkage type hinge mechanism 5 enables the leg support bracket 6 and the chair back bracket 7 to be regulated more smoothly by arranging the left hinge component 52 and the right hinge component 53. The left hinge assembly 52 and the right hinge assembly 53 can be synchronously adjusted through the connecting cross rod 51, and only one driving mechanism 4 is needed, so that the cost is reduced, and the synchronism is improved. The connecting cross rod 51 can also improve the structural stability of the left hinge assembly 52 and the right hinge assembly 53, and ensure the adjustment stability of the electric chair.

As before, the left hinge assembly 52 and the right hinge assembly 53 are identical in structure; accordingly, only the specific structure of the left hinge assembly 52 will be described in detail in this embodiment, and repetitive description will be avoided.

Referring to fig. 8, in particular, the left hinge assembly 52 includes a first link 521, a second link 522, a third link 523, a fourth link 524, a long rod 525, and a left connecting plate 526. One end of the first link 521 and one end of the second link 522 are rotatably connected to the seat plate 3. The other end of the first link 521 is rotatably connected to one end of the third link 523. One end of the second link 522 is rotatably coupled to one end of the fourth link 524. The third link 523 is rotatably connected to the fourth link 524. The other end of the third link 523 and the other end of the fourth link 524 are connected to the leg rest bracket 6. One end of the long rod 525 is rotatably connected to the second link 522, and the other end of the long rod 525 is rotatably connected to the left connecting plate 526. The left connecting plate 526 is rotatably connected with the seat plate 3, and the left connecting plate 526 is also connected with the seatback bracket 7. One end of the connecting rail 51 is connected to the second link 522, and the other end of the connecting rail 51 is connected to the second link 522 in the right hinge assembly 53. The structure of the left hinge assembly 52 provided in this embodiment can simultaneously achieve lifting or retraction of the leg rest bracket 6 and angular adjustment of the seatback bracket 7 by a simple structure.

Referring to fig. 8, the left hinge assembly 52 further includes a fixing plate 527. One end of the first connecting rod 521 and one end of the second connecting rod 522 are rotatably connected with a fixed plate 527, and the fixed plate 527 is fixedly connected with the seat plate 3; that is, one ends of the first and second links 521 and 522 are rotatably connected to the fixing plate 527, and the first and second links 521 and 522 are connected to the seat plate 3. By providing the fixing plate 527, the left hinge assembly 52 can be conveniently assembled, and the left hinge assembly 52 is more complete in structure; but also to more conveniently mount the left hinge assembly 52 on the seat pan 3. On the other hand, the fixing plate 527 connects the first and second links 521 and 522, enabling the extension and retraction of the left hinge assembly 52 to be smoother.

Referring to fig. 9 and 10, further, a left mounting plate 71 is disposed on the left side of the chair back bracket 7, a slot 711 is disposed on the left mounting plate 71, and a left connecting plate 526 is inserted into the slot 711. It should be noted that the right side of the seat back bracket 7 is also provided with a right mounting plate (not shown) having the same structure as the left mounting plate 71, and the right mounting plate is detachably connected to a right connecting plate (corresponding to the left connecting plate 526) of the right hinge assembly 53. Through the structural design of left mounting panel 71, can realize dismantling the connection between back of the chair support 7 and the bedplate 3, and connection structure is simpler, and the connection process is convenient and fast more.

Referring to fig. 7, further, the driving mechanism 4 includes a driving motor 41, a screw 42, and a moving housing 43. The output end of the driving motor 41 is connected with one end of the screw 42 for driving the screw 42 to rotate. The movable housing 43 is sleeved on the screw 42 and is in threaded connection with the screw 42. The drive motor 41 is mounted on the seat plate 3. The end of the movable housing 43 remote from the drive motor 41 is connected to the linked hinge mechanism 5, specifically to an intermediate position of the connecting rail 51. The driving motor 41 rotates to drive the screw rod 42 to rotate around the central axis, and the screw rod 42 rotates to drive the movable housing 43 to move along the vertical direction of the screw rod 42 relative to the screw rod 42. The driving motor 41 can realize forward rotation and reverse rotation by control, so that the screw rod 42 can also rotate forward or reverse rotation, and the movable housing 43 can move in two directions under the action of the screw rod 42, thereby realizing the purpose of driving the linked hinge mechanism 5 to extend or retract.

Referring to fig. 1, specifically, a mounting seat 8 is mounted on a lower end surface of the seat plate 3, and a driving motor 41 is mounted on the mounting seat 8. The driving motor 41 can be conveniently installed and fixed by arranging the installation seat 8.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (10)

1. A chair frame for an electric chair, comprising:

A base (1);

-a main lever (2) mounted on the base (1);

A seat plate (3) that is mounted on the main lever (2) and is located above the main lever (2);

a driving mechanism (4) mounted on the lower end surface of the seat plate (3);

A linkage hinge mechanism (5) which is movably mounted on the seat plate (3) and is connected with the output end of the driving mechanism (4);

A leg support bracket (6) which is arranged at one end of the linkage type hinge mechanism (5) close to the front of the seat plate (3);

A chair back bracket (7) which is detachably arranged at one end of the linkage type hinge mechanism (5) close to the rear of the seat plate (3);

The driving mechanism (4) can drive the linkage type hinge mechanism (5) to extend or retract, so as to adjust the leg support bracket (6) to lift or retract and adjust the angle between the chair back bracket (7) and the seat plate (3).

2. The chair frame of an electric chair according to claim 1, wherein both ends of the seat plate (3) are bent downward to form bending parts (31), and both ends of the main rod (2) are respectively connected with two bending parts (31).

3. The chair frame of the electric chair according to claim 2, characterized in that the two ends of the main rod (2) are provided with connecting pieces (21), the connecting pieces (21) are provided with first mounting holes (22), and the bending parts (31) are provided with second mounting holes (32) corresponding to the first mounting holes (22); the connecting piece passes through the first mounting hole (22) and the second mounting hole (32) to connect and fix the bending part (31) and the connecting piece (21).

4. A chair frame for an electric chair according to claim 1, characterized in that the base (1) comprises swivel legs (11), pulleys (12), gas bars (13) and adjustment handles (14); swivel chair leg (11) include a plurality of landing legs (111), every all install on landing leg (111) pulley (12), gas pole (13) are installed on swivel chair leg (11), mobile jib (2) rotationally cover is established gas pole (13) outside just the regulation end of gas pole (13) is outstanding mobile jib (2), adjust handle (14) install on mobile jib (2), just be located directly over the regulation end of gas pole (13).

5. The chair frame of an electric chair according to claim 1, characterized in that the linkage type hinge mechanism (5) comprises a connecting cross rod (51), a left hinge assembly (52) and a right hinge assembly (53), wherein the left hinge assembly (52) and the right hinge assembly (53) are arranged at intervals and are movably arranged on the seat board (3), the connecting cross rod (51) is connected with the output end of the driving mechanism (4), two ends of the connecting cross rod are respectively connected with the left hinge assembly (52) and the right hinge assembly (53), and the left hinge assembly (52) and the right hinge assembly (53) are identical in structure.

6. The frame of an electric chair according to claim 5, wherein the left hinge assembly (52) comprises a first link (521), a second link (522), a third link (523), a fourth link (524), a long bar (525) and a left connecting plate (526); one end of the first connecting rod (521) and one end of the second connecting rod (522) are rotatably connected with the seat board (3), the other end of the first connecting rod (521) is rotatably connected with one end of the third connecting rod (523), the other end of the second connecting rod (522) is rotatably connected with one end of the fourth connecting rod (524), the third connecting rod (523) is rotatably connected with the fourth connecting rod (524), and the other end of the third connecting rod (523) and the other end of the fourth connecting rod (524) are connected with the leg support bracket (6); one end of the long rod (525) is rotatably connected with the second connecting rod (522), the other end of the long rod is rotatably connected with the left connecting plate (526), and the left connecting plate (526) is rotatably connected with the seat plate (3) and the chair back bracket (7); one end of the connecting cross rod (51) is connected with the second connecting rod (522).

7. The chair frame of an electric chair according to claim 6, characterized in that the left hinge assembly (52) further comprises a fixing plate (527), wherein one end of the first link (521) and one end of the second link (522) are rotatably connected to the fixing plate (527), and the fixing plate (527) is fixedly connected to the seat plate (3).

8. The chair frame of an electric chair according to claim 6, characterized in that the left side of the chair back support (7) is provided with a left mounting plate (71), the left mounting plate (71) is provided with a slot (711), and the left connecting plate (526) is inserted into the slot (711).

9. The chair frame of an electric chair according to claim 1, characterized in that the driving mechanism (4) comprises a driving motor (41), a screw rod (42) and a movable housing (43), wherein the driving motor (41) is connected with one end of the screw rod (42) and is used for driving the screw rod (42) to rotate, the movable housing (43) is sleeved on the screw rod (42) and is in threaded connection with the screw rod (42), the driving motor (41) is mounted on the seat board (3), and one end, far away from the driving motor (41), of the movable housing (43) is connected with the linkage hinge mechanism (5).

10. A chair frame for an electric chair according to claim 9, characterized in that the lower end surface of the seat plate (3) is provided with a mounting seat (8), and the drive motor (41) is mounted on the mounting seat (8).