Main body frame for seat and seat

Abstract

The utility model discloses a main body frame for seat and seat, the main body frame comprises a base, a seat frame and a chair back connecting piece, the chair back connecting piece is rotatably connected with the base through a first shaft body, the chair back connecting piece is rotatably connected with the seat frame through a second shaft body, and the base is movably connected with the seat frame through a third shaft body. The first shaft body, the second shaft body and the third shaft body are arranged in parallel at intervals; and the seat frame is configured to rotate and move relative to the base under the driving action of the second shaft body when the chair back connecting piece rotates around the first shaft body relative to the base. According to the invention, the seat frame can realize a composite motion track of rotation and movement relative to the base, and the seat frame can be ensured to synchronously tilt along with the chair back assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of seat, concretely relates to a main body frame for seat and seat. BACKGROUND

[0002] The reclining function of the seat can greatly improve the comfort of the seat, and the ideal reclining process should realize the complete synchronous movement of the seat frame and the backrest assembly, that is, the two are inclined at a coordinated angle and track, ensuring that the support surface of the human back and hips maintains a stable relative position, avoiding problems such as the waist being suspended, the hips sliding or the front edge of the thigh being pressed. However, in the prior art, the seat frame of the seat is difficult to realize complete synchronous reclining with the backrest assembly, and the problem of the seat frame acting laggingly relative to the backrest assembly often occurs. SUMMARY

[0003] The utility model discloses a main body frame for seat and seat, which can drive the seat frame to rotate and move during the reclining process of the backrest assembly through the backrest connecting piece, realizing the synchronous reclining of the seat frame relative to the backrest assembly.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A main body frame for seat, the main body frame includes a base, a seat frame and a backrest connecting piece, the backrest connecting piece is rotatably connected with the base through a first shaft body, the backrest connecting piece is rotatably connected with the seat frame through a second shaft body, the base is movably connected with the seat frame through a third shaft body, the first shaft body, the second shaft body and the third shaft body are parallel and spaced apart;

[0006] The seat frame is configured to rotate and move relative to the base under the driving action of the second shaft body when the backrest connecting piece rotates relative to the base around the first shaft body.

[0007] Preferably, the connecting line between the first shaft body, the second shaft body and the third shaft body forms a triangle, and the third shaft body, the first shaft body and the second shaft body are arranged from front to back along the front-to-back direction of the seat, and the first shaft body is lower than the second shaft body and the third shaft body.

[0008] Preferably, the seat frame is provided with a long slot, the third shaft body extends into the long slot, and the part of the third shaft body extending into the long slot is rotatable and slidable relative to the inner wall of the long slot.

[0009] Preferably, the main body frame further includes a connecting frame provided on the seat frame, and the long slot is formed in the front end of the connecting frame.

[0010] Preferably, the rear end of the connecting frame forms an adapter hole, and the second shaft body is fixedly arranged on the backrest connecting piece and rotatably arranged in the adapter hole.

[0011] Preferably, the main body frame further comprises a connecting sleeve rotatably sleeved on the third shaft body, the connecting sleeve extending into the long slot and rolling with the inner wall of the long slot.

[0012] Preferably, the inner wall of the long slot is formed with an annular flange at the edge, and the end face of the connecting sleeve extending into the long slot is matched with the annular flange to limit the rolling path of the connecting sleeve.

[0013] Preferably, the third shaft body is provided with a shaft hole, and the main body frame further comprises a pin inserted into the shaft hole, the pin forming a limiting protrusion matched with the outer wall surface of the annular flange to limit the connecting frame from being separated from the third shaft body.

[0014] Preferably, the connecting frame is provided with two groups, and the two groups of the connecting frame are symmetrically arranged on the bottom wall of the seat frame in the left-right direction of the seat.

[0015] In addition, in order to achieve the above object, the utility model also adopts the following technical scheme:

[0016] A seat comprises a backrest assembly, and the seat further comprises the main body frame according to any one of the above technical schemes, and the backrest assembly is arranged on the backrest connecting piece.

[0017] Compared with the prior art, the utility model has the beneficial effects that the base, the seat frame and the backrest connecting piece are hingedly connected by the first shaft body, the second shaft body and the third shaft body. The backrest connecting piece is rotatably connected with the base, that is, the backrest connecting piece can only rotate relative to the base around the first shaft body; the backrest connecting piece is rotatably connected with the seat frame, that is, the backrest connecting piece can rotate relative to the seat frame around the second shaft body when rotating around the first shaft body; and the seat frame is movably connected with the base, that is, the seat frame can not only rotate relative to the base around the first shaft body and the third shaft body, but also move relative to the base in the front-rear direction of the seat. Through the above structural design, the seat frame can realize the combined motion track of rotation and movement relative to the base, and the seat frame can ensure synchronous reclining action with the backrest assembly. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A structural schematic view of a main body frame for a seat is provided for the embodiments of the present application;

[0019] Figure 2 An exploded view of the main body frame;

[0020] Figure 3 A Figure 2 An enlarged schematic view of part A;

[0021] Figure 4 A state side view of the main body frame at the minimum reclining angle;

[0022] Figure 5 is a side view of the state of the main frame at the maximum reclining angle;

[0023] Figure 6 is a longitudinal sectional view of the connecting frame and the third shaft body at the long slot;

[0024] Figure 7 is a structural schematic view of the base, the chair back connecting piece and the locking mechanism;

[0025] Figure 8 is a structural schematic view of the seat provided with the main frame of the embodiment.

[0026] Wherein, 1, base; 2, seat frame; 3, chair back connecting piece; 4, first shaft body; 5, second shaft body; 6, third shaft body; 60, connecting bush; 61, pin; 610, limiting convex edge; 7, connecting frame; 70, long slot; 71, annular flange; 8, locking mechanism; 80, clamping plate; 81, fixed block; 810, clamping groove; 9, chair back assembly. DETAILED DESCRIPTION

[0027] The utility model will be further described below in combination with the drawings and specific embodiments. It should be noted that the embodiments described below or the technical features thereof can be combined to form new embodiments without conflict. Except for special description, the materials and equipment used in the embodiments can be purchased from the market. The examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the application and cannot be understood as a limitation on the application.

[0028] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "communicated", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or connected through an intermediate medium, or the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] The embodiment provides a main frame for a seat, as shown in Figure 1 、 Figure 2 and Figure 3 , which comprises a base 1, a seat frame 2 and a backrest connecting piece 3. Wherein, the backrest connecting piece 3 is rotatably connected with the base 1 through a first shaft body 4, the backrest connecting piece 3 is rotatably connected with the seat frame 2 through a second shaft body 5, and the base 1 is movably connected with the seat frame 2 through a third shaft body 6. The first shaft body 4, the second shaft body 5 and the third shaft body 6 are parallel and spaced apart in the length direction.

[0031] The rotatable connection of the backrest connecting piece 3 with the base 1 through the first shaft body 4 is a relatively rigid connection mode, which makes the two components can only rotate relative to a fixed axis, and in the embodiment, the backrest connecting piece 3 can only rotate relative to the base 1 around the first shaft body 4. The rotatable connection of the backrest connecting piece 3 with the seat frame 2 through the second shaft body 5 means that the two components can not only rotate around a fixed axis, but also rotate relative to another axis, and in the embodiment, the backrest connecting piece 3 can also rotate relative to the seat frame 2 around the second shaft body 5 when rotating around the first shaft body 4. The "movable connection" mentioned above means that the two components can not only move like the rotatable connection, but also move relative to each other, and in the embodiment, the seat frame 2 can not only rotate relative to the base 1 around the first shaft body 4, but also rotate relative to the base around the third shaft body 6, and the seat frame 2 can also move relative to the base 1 along the front and back directions of the seat.

[0032] The seat frame 2 in the embodiment is configured to rotate and move relative to the base 1 under the driving action of the second shaft body 5 when the backrest connecting piece 3 rotates relative to the base 1 around the first shaft body 4. The main frame provided by the embodiment uses the first shaft body 4, the second shaft body 5 and the third shaft body 6 to interlink the base 1, the seat frame 2 and the backrest connecting piece 3. Wherein, the backrest connecting piece 3 is rotatably connected with the base 1, the backrest connecting piece 3 is rotatably connected with the seat frame 2, and the seat frame 2 is movably connected with the base 1. Through the above structural design, the seat frame 2 can realize the combined motion track of rotation and movement relative to the base 1, and ensure that the seat frame 2 can follow the synchronous tilting action of the backrest assembly 9.

[0033] As shown in Figure 4As shown, in the front-rear direction of the seat described in the embodiment, "rear" refers to the side where the backrest connecting piece 3 is located, and "front" refers to the side of the seat frame 2 away from the backrest connecting piece 3.

[0034] In combination Figure 8 As shown, the main frame provided in the embodiment can be applied to a seat. The backrest connecting piece 3 in the embodiment is used to be connected with a backrest assembly 9 of the seat. The backrest assembly 9 includes a backrest arranged on the backrest connecting piece 3. Further, the backrest assembly 9 can further include a lumbar support, a neck support, or the like arranged on the backrest. The backrest can be fixedly or rotatably arranged on the backrest connecting piece 3. The lumbar support, the neck support, or the like can also be fixedly or rotatably arranged on the backrest, or can be slidably arranged on the backrest in the up-down direction or the front-rear direction. The structure of the backrest assembly 9 can refer to the prior art, and will not be described here.

[0035] In combination Figure 4 And Figure 5 As shown, the first shaft body 4, the second shaft body 5, and the third shaft body 6 in the embodiment are in a triangular distribution (the connecting lines among the three form a triangle), and the third shaft body 6, the first shaft body 4, and the second shaft body 5 are arranged from front to back along the front-rear direction of the seat. The first shaft body 4 is lower than the second shaft body 5 and the third shaft body 6. When the user leans back, the backrest connecting piece 3 rotates relative to the base 1, and at the same time, the backrest connecting piece 3 drives the seat frame 2 to move through the second shaft body 5. Since the second shaft body 5 is higher than the first shaft body 4 and is located rearward relative to the first shaft body 4, the seat frame 2 as a whole swings rearward relative to the base 1. At the same time, since the third shaft body 6 is located forward relative to the first shaft body 4 and the seat frame 2 can also move, the seat frame 2 moves closer to the backrest assembly 9 in the process of swinging rearward. Thus, the seat frame 2 can move synchronously with the backrest connecting piece 3, and can reduce the angle change between the seat frame 2 and the backrest assembly 9 through displacement compensation, thereby avoiding problems such as the waist being suspended, the hips sliding, or the front edge of the thigh being pressed.

[0036] Further, the seat frame 2 in the embodiment is provided with a long slot 70, the third shaft body 6 extends into the long slot 70, and the part of the third shaft body 6 extending into the long slot 70 is rotatable and slidable relative to the inner wall of the long slot 70. By providing the long slot 70, a rotatable and slidable movable connection point of the third shaft body 6 is formed. At the same time, the inner wall of the long slot 70 can limit the sliding of the third shaft body 6 along the length direction of the long slot 70 (it is easy to understand that the length direction of the long slot 70 will also change in the process of the seat frame 2 swinging relative to the base 1), thereby preventing the seat frame 2 from shaking in the process of moving, and improving the comfort of the user.

[0037] Further, the main body frame provided by the embodiment further comprises a connecting frame 7 arranged on the seat frame 2, and a long slot 70 is arranged at the front end of the connecting frame 7. The connecting frame 7 is arranged to facilitate the assembly of the seat frame 2 and the third shaft body 6. In the embodiment, the connecting frame 7 is fixedly arranged on the seat frame 2 and can synchronously swing and move with the seat frame 2. In other optional embodiments, the connecting frame 7 can be slidably arranged relative to the seat frame 2, but the connecting frame 7 has at most a degree of movement relative to the seat frame 2 along the length direction of the long slot 70, so as to ensure that the connecting frame 7 can synchronously swing and move in the same direction with the seat frame 2.

[0038] In addition, as shown in Figure 2 and Figure 3 , the connecting frame 7 in the embodiment is formed with an adapter hole at the rear end, and the second shaft body 5 is fixedly arranged on the backrest connecting piece 3 and rotatably arranged in the adapter hole. The above structure facilitates the assembly of the seat frame 2 and the second shaft body 5. In the embodiment, the first shaft body 4 and the third shaft body 6 are arranged on the base 1, and the first shaft body 4 and the third shaft body 6 can be detachably mounted on the base 1 or integrally formed with the base 1 when the base 1 is manufactured. Similarly, the second shaft body 5 is arranged on the backrest connecting piece 3, and the second shaft body 5 can be detachably mounted on the backrest connecting piece 3 or integrally formed with the backrest connecting piece 3 when the backrest connecting piece 3 is manufactured. During assembly, the position of the seat frame 2 relative to the base 1 and the backrest connecting piece 3 is first placed, then the adapter hole and the long slot 70 are aligned with the second shaft body 5 and the third shaft body 6 and inserted, and then the connecting frame 7 and the seat frame 2 are assembled after the connecting frame 7 is inserted into place.

[0039] The base 1, the backrest connecting piece 3, the first shaft body 4, the second shaft body 5 and the third shaft body 6 in the embodiment are made of high-strength materials, and specifically can be high-strength plastics or metals.

[0040] As shown in Figure 3 and Figure 5 , the main body frame provided by the embodiment further comprises a connecting bushing 60 rotatably sleeved on the third shaft body 6, and the connecting bushing 60 extends into the long slot 70 and is in rolling contact with the inner wall of the long slot 70. The connecting bushing 60 can ensure the matching precision of the long slot 70 and the third shaft body 6, and avoid problems such as movement jamming or abnormal sound caused by excessive gap. At the same time, the rolling contact converts sliding friction into rolling friction, which can significantly reduce the resistance when the seat frame 2 moves, make the reclining operation more convenient and smooth, and reduce the wear of the parts and prolong the service life.

[0041] Further, the inner wall of the long slot 70 in the embodiment is formed with an annular flange 71 at the edge, and the end face of the connecting sleeve 60 extending into the long slot 70 cooperates with the annular flange 71 to limit the rolling path of the connecting sleeve 60. Further, the third shaft body 6 is provided with a shaft hole, and the main body frame further includes a pin 61 inserted into the shaft hole, the pin 61 forms a limiting protrusion 610 which cooperates with the outer wall surface of the annular flange 71 to limit the disengagement of the connecting frame 7 from the third shaft body 6. By providing the pin 61, the disengagement of the connecting frame 7 from the third shaft body 6 can be prevented, and the movable connection relationship between the third shaft body 6 and the long slot 70 can be ensured to be reliable for a long time.

[0042] In combination Figure 2 As shown, the connecting frame 7 in the embodiment is provided with two groups, and the two groups of connecting frames 7 are symmetrically arranged on the bottom wall of the seat frame 2 along the left-right direction of the seat. It is easy to understand that two groups of second shaft bodies 5 and third shaft bodies 6 must be correspondingly provided relative to the two groups of connecting frames 7, and for the same reason, two groups of first shaft bodies 4 must also be correspondingly provided. One group of first shaft bodies 4, second shaft bodies 5 and third shaft bodies 6 are arranged on the side of one group of connecting frames 7, and another group of first shaft bodies 4, second shaft bodies 5 and third shaft bodies 6 are arranged on the side of the other group of connecting frames 7. Through the above structural design, the load between a single group of connecting frames 7 and the second shaft body 5 and the third shaft body 6 can be dispersed, which is especially suitable for seats with large load (such as office chairs, car seats), and prolongs the service life of the key components. At the same time, the symmetrical layout of the two groups of connecting frames 7 can make the forces on both sides of the seat frame 2 uniform, avoid tilting or deformation caused by unilateral force, and improve the overall rigidity and stability of the main body frame.

[0043] It is easy to understand that when a user normally sits on the seat, the backrest assembly 9 and the backrest connecting piece 3 remain fixed relative to the base 1, so that the user can normally lean against the backrest assembly 9. Therefore, the backrest connecting piece 3 in the main body frame provided by the embodiment has a locked state and an unlocked state relative to the base 1. When the backrest connecting piece 3 is in the unlocked state relative to the base 1, the backrest connecting piece 3 can rotate relative to the base 1, realizing the synchronous reclining function of the seat frame 2 and the backrest assembly 9. When the backrest connecting piece 3 is in the locked state relative to the base 1, the backrest connecting piece 3 can remain fixed relative to the base 1, ensuring that the user can normally lean against the backrest assembly 9.

[0044] The locking and unlocking structure of the backrest connecting piece 3 relative to the base 1 can adopt the existing structural design, which is illustrated in the embodiment as follows: Figure 7As shown, a locking mechanism 8 can be arranged between the base 1 and the chair back connecting piece 3, the locking mechanism 8 comprises a clamping plate 80 movably arranged on the base 1 and a fixed block 81 fixedly arranged on the chair back connecting piece 3, an arc-shaped slot is arranged on the fixed block 81, and a plurality of clamping grooves 810 are arranged on the bottom wall of the arc-shaped slot along the arc line of the arc-shaped slot. The arc of the arc-shaped slot is the same as the arc of the swing track of the chair back connecting piece 3, so that the clamping plate 80 can be clamped into each clamping groove 810 in turn during the rotation of the chair back connecting piece 3 relative to the base 1. When the clamping plate 80 is separated from the clamping groove 810, the chair back connecting piece 3 is in an unlocked state relative to the base 1, and the user can normally use the reclining function of the seat to adjust the posture of the chair back assembly 9 and the seat frame 2; when the clamping plate 80 is clamped into the clamping groove 810, the chair back connecting piece 3 is in a locked state relative to the base 1, so that the posture of the chair back assembly 9 can normally support the back of the user after being adjusted in place. A spring, a metal spring plate or other elastic member can be arranged on the base 1 to press the clamping plate 80, so that the clamping plate 80 can always be clamped into the clamping groove 810 without other external force, that is, the chair back connecting piece 3 is kept in a locked state relative to the base 1. In addition, a lever or a pull rope or the like can be arranged for the user to operate, one end of the lever or the pull rope is fixed to the clamping block, and the other end is led out to the outside of the seat. The user can drive the clamping block to separate from the clamping groove 810 by pulling the lever or the pull rope. The above-mentioned elastic member, lever or pull rope and the like are common structures, and their arrangement mode is also the prior art, which will not be described here.

[0045] As shown, Figure 8 The main frame provided by the embodiment can be applied to a seat, and the seat comprises a chair back assembly 9 arranged on the chair back connecting piece 3.

[0046] Finally, it should be noted that the above-mentioned embodiments are only optional embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A main frame for a seat, the main frame comprising a base, a seat frame and a backrest connecting member, characterized in that, The chair back connecting piece is rotatably connected with the base through a first shaft body, rotatably connected with the seat frame through a second shaft body, and movably connected with the seat frame through a third shaft body. The first shaft body, the second shaft body and the third shaft body are parallel and spaced apart. The seat frame is configured to rotate and move relative to the base under the driving action of the second shaft body when the chair back connecting piece rotates relative to the base around the first shaft body.

2. The body frame of claim 1, wherein, The connecting lines between the first shaft body, the second shaft body and the third shaft body form a triangle, and the third shaft body, the first shaft body and the second shaft body are arranged from front to back along the front-to-back direction of the seat, with the first shaft body being lower than the second shaft body and the third shaft body.

3. The main frame according to claim 1 or 2, characterized in that, The seat frame is provided with a long slot, the third shaft body extends into the long slot, and the portion of the third shaft body extending into the long slot is rotatable and slidable relative to the inner wall of the long slot.

4. The body frame of claim 3, wherein, The main frame further comprises a connecting bracket provided on the seat frame, and the long slot is formed in the front end of the connecting bracket.

5. The body frame of claim 4, wherein, The rear end of the connecting bracket is formed with an adapter hole, and the second shaft body is fixedly arranged on the chair back connecting piece and rotatably arranged in the adapter hole.

6. The body frame of claim 4, wherein, The main frame further comprises a connecting bushing rotatably sleeved on the third shaft body, the connecting bushing extends into the long slot and is in rolling fit with the inner wall of the long slot.

7. The body frame of claim 6, wherein, The inner wall of the long slot is formed with an annular flange at the edge, and the end face of the connecting bushing extending into the long slot is matched with the inner wall surface of the annular flange to limit the rolling path of the connecting bushing.

8. The body frame of claim 7, wherein, The third shaft body is provided with a shaft hole, the main frame further comprises a pin inserted into the shaft hole, the pin forms a limiting protrusion, and the limiting protrusion is matched with the outer wall surface of the annular flange to limit the disengagement of the connecting bracket from the third shaft body.

9. The body frame of claim 4, wherein, The connecting bracket is provided with two groups, and the two groups of connecting brackets are symmetrically arranged on the bottom wall of the seat frame along the left-right direction of the seat.

10. A seat comprising a seat back assembly, characterized by, The seat further comprises the main frame according to any one of claims 1 to 9, and the chair back assembly is arranged on the chair back connecting piece.

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