A multi-stage angle positioning adjustment device and a car seat back table

Abstract

The present invention discloses a multi-stage angle positioning adjustment device and a car seat back table. The multi-stage angle positioning adjustment device is composed of a bracket, a rotating shaft, a ratchet, a cam, a fixed shaft, a pawl and a torsion spring, and can realize the support of the table board body at multiple angles on the front car seat back, automatic unlocking, temporary folding, and folding when not in use. In addition, the multi-stage angle positioning adjustment device has a simple structure, is easy to assemble and process, and has a large supporting strength for supporting the table board body at multiple angles. The locking and unlocking of the multi-stage angle positioning adjustment device, that is, the support and folding of the table board body, can be achieved by simply flipping the table board body upward or downward, and the operation is extremely simple and convenient. Therefore, the present invention has the advantages of simple structure, easy assembly, multi-stage adjustable table board support angle, large supporting strength, and simple and convenient operation. In addition, the present invention can be applied to most car seats on the market.

Description

Technical Field

[0001] The invention relates to a multi-stage angle positioning and adjusting device and a car seat back table plate using the device. Background Art

[0002] As people's living standards improve, they have more and more requirements for the functions that car seats can provide. Among them, the use of small tables on the back of seats provides great convenience and comfort for people's in-car entertainment.

[0003] The existing small table for the backrest of a car seat has the following shortcomings:

[0004] First, the structure is relatively complex. On the one hand, it is composed of many parts and components, which makes production and assembly difficult. On the other hand, the back of the table top body needs to be processed into a complex structure to accommodate the installation of parts, which makes processing and molding difficult, increasing production costs.

[0005] Secondly, the internal adjustment mechanism of the small table on the car seat back is mostly a connecting rod mechanism, which is not strong enough. When the vehicle is bumpy during driving, the connecting rod mechanism is easily damaged by vibration, affecting the normal use of its adjustment function.

[0006] Third, when the angle position of the small table on the car seat back needs to be adjusted, most car seat small tables have only one angle position and cannot be adjusted in multiple levels to adapt to the tilt angle of the front seat back.

[0007] Fourthly, the small table on the back of the car seat requires a special unlocking and locking mechanism to unlock and fix the small table. Generally, the unlocking and locking mechanisms are relatively complicated, and unlocking and locking are relatively troublesome, which reduces the convenience of operation for passengers to a certain extent. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a multi-stage angle positioning adjustment device and a car seat back table to solve the problem that the existing car seat back table has difficulty in taking into account the structural complexity, supporting strength, multi-stage angle adjustment, and locking and unlocking convenience at the same time.

[0009] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0010] A multi-stage angle positioning adjustment device, characterized in that: the multi-stage angle positioning adjustment device is provided with a bracket, a rotating shaft, a ratchet, a cam, a fixed shaft, a pawl and a torsion spring; wherein, a limiting column is provided on the side of the ratchet, and the outer edge of the ratchet is divided into a ratchet tooth section provided with a plurality of ratchet teeth and a smooth section without ratchet teeth; the cam is provided with an arc-shaped limiting groove, and a first protrusion, a second protrusion and a groove portion located between the first protrusion and the second protrusion are provided on the outer edge of the cam;

[0011] The inner end of the rotating shaft is mounted on the bracket, the ratchet and the cam are both mounted on the middle of the rotating shaft, and the ratchet is fixed to the rotating shaft, and the bracket and the cam are both able to rotate around the rotating axis of the rotating shaft, so that: the center of the circular arc limiting groove falls on the rotating axis, and the limiting column extends into the circular arc limiting groove;

[0012] The inner end of the fixed shaft is fixed on the bracket, and the fixed shaft is parallel to the rotating shaft. The pawl and the torsion spring are rotatably mounted on the fixed shaft, and the inner end of the torsion spring is fixed on the pawl, and the outer end is relatively fixed to the fixed shaft, so that: when the pawl is driven by the bracket rotating around the rotating axis to stop at the ratchet tooth segment, under the action of the torsion spring, one side of the pawl clamps one of the ratchet teeth of the ratchet wheel, and the other side is located in the groove portion of the cam, and driven by the bracket rotating in the positive direction around the rotating axis, the pawl can slide on each ratchet tooth of the ratchet wheel in the positive direction, and drive the cam to rotate in the positive direction around the rotating axis by pushing the first protrusion, and when the pawl clamps the last ratchet tooth of the ratchet wheel in the positive direction, the limiting column slides to the starting end of the arc-shaped limiting groove in the positive direction.

[0013] Wherein, the ratchet and the cam are arranged in any one of the following two ways:

[0014] Mode 1: The ratchet is located on the inner side of the cam, then: the limiting column is arranged on the outer side of the ratchet; when the pawl is driven by the bracket rotating around the rotation axis to stay on the ratchet tooth segment, under the action of the torsion spring, the inner side of the pawl clamps one of the ratchet teeth of the ratchet, and the outer side is located in the groove of the cam;

[0015] Method 2: The ratchet is located on the outside of the cam, then: the limiting column is arranged on the inner side of the ratchet; when the pawl is driven by the bracket rotating around the rotation axis to stop at the ratchet tooth segment, under the action of the torsion spring, the outer part of the pawl clamps one of the ratchet teeth of the ratchet, and the inner part is located in the groove part of the cam.

[0016] As a preferred embodiment of the present invention: the bracket is provided with a limiting protrusion, and the smooth section of the ratchet is provided with an arc-shaped groove. When the bracket drives the cam to rotate around the rotation axis in the reverse direction through the pawl, so that the limiting protrusion is located at the end of the arc-shaped limiting groove along the positive direction, and the bracket continues to rotate around the rotation axis in the reverse direction to a certain position, the limiting protrusion can be stuck in the arc-shaped groove.

[0017] As a preferred embodiment of the present invention: the bracket is provided with a rotating shaft mounting hole and a fixed shaft mounting hole, the inner end portion of the rotating shaft is rotatably mounted in the rotating shaft mounting hole of the bracket, and the inner end portion of the fixed shaft is fixed in the fixed shaft mounting hole of the bracket; the ratchet is welded and fixed on the rotating shaft; the pawl is provided with a torsion spring mounting hole, and the inner end of the torsion spring is fixed in the torsion spring mounting hole of the pawl.

[0018] A car seat back table board, provided with a table board body, characterized in that: the car seat back table board is also provided with the multi-stage angle positioning adjustment device;

[0019] The table top body is provided with a rotating shaft hole, the multi-stage angle positioning adjustment device is arranged on the inner side of the rotating shaft hole, the outer end of the rotating shaft passes through the rotating shaft hole and extends to the outer side of the table top body, and the rotating shaft can rotate in the rotating shaft hole, the bracket, the outer end of the fixed shaft, and the outer end of the torsion spring are all fixedly connected to the table top body; the outer end of the rotating shaft is used to be fixedly connected to the car seat backrest.

[0020] As a preferred embodiment of the present invention: the table board body is provided with a table board surface and a left side edge and a right side edge respectively arranged on the left and right sides of the table board surface, the left side edge and the right side edge are each provided with a rotation axis hole, and the rotation axis hole on the left side edge is coaxial with the rotation axis hole on the right side edge; the car seat back table board is provided with two of the multi-stage angle positioning adjustment devices;

[0021] For one of the multi-stage angle positioning adjustment devices, the outer end of its rotating shaft passes through the rotating shaft hole on the left side to the outside of the left side, the outer end of its fixed shaft and the outer end of the torsion spring are both fixed to the left side, and its bracket is fixed to the back of the table top;

[0022] For the other multi-stage angle positioning and adjustment device, the outer end of its rotating shaft passes through the rotating shaft hole on the right side to the outside of the right side, the outer end of its fixed shaft and the outer end of the torsion spring are both fixed on the right side, and its bracket is fixed on the back of the table top.

[0023] Among them, preferably: the table top body is also provided with a rear side edge, and the rear side edge is arranged on the rear side of the table top surface; the bracket of the multi-stage angle positioning adjustment device is also fixed on the rear side edge.

[0024] Among them, preferably: the left side and the right side are both provided with a fixing shaft hole for fixing the outer end of the fixing shaft and a torsion spring fixing hole for fixing the outer end of the torsion spring; the bracket is fixedly connected to the back side of the table top and the rear side by bolts respectively.

[0025] As a preferred embodiment of the present invention: a fixing plate is fixed to the outer end of the rotating shaft, and the fixing plate is used to be fixedly connected to the car seat backrest by bolts.

[0026] As a preferred embodiment of the present invention: the back side of the table top is provided with honeycomb reinforcing ribs.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] First, the present invention utilizes a multi-stage angle positioning and adjustment device which is composed of a bracket, a rotating shaft, a ratchet, a cam, a fixed shaft, a pawl and a torsion spring through an ingenious assembly method, which can realize the support, automatic unlocking, temporary folding, and folding of the table board body at multiple angle positions on the front car seat backrest, and the multi-stage angle positioning and adjustment device has a simple structure, is easy to assemble and process, and has a large supporting strength for the multi-stage angle position support of the table board body. The locking and unlocking of the multi-stage angle positioning and adjustment device, that is, the support and folding of the table board body, can be achieved by simply flipping the table board body upward or downward, and the operation is extremely simple and convenient. Therefore, the present invention has the advantages of simple structure, easy assembly, multi-stage adjustable table board support angle, large supporting strength, and simple and convenient operation, and the present invention can be applied to most car seats on the market.

[0029] Secondly, the present invention arranges a limiting boss on the bracket and an arc-shaped groove on the smooth section of the ratchet. The arc-shaped groove is used to constrain the limiting boss, thereby reducing the shaking and flapping of the table board body and ensuring that the back of the table board body can be reliably fitted on the front car seat backrest when not affected by external force. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0031] Figure 1 It is a structural schematic diagram of the multi-stage angle positioning adjustment device of the present invention when it is in use;

[0032] Figure 2 It is a schematic diagram of the structure explosion of the multi-stage angle positioning adjustment device of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure explosion of the car seat back table board of the present invention;

[0034] Figure 4 A rear view of the car seat back table of the present invention;

[0035] Figure 5It is a structural schematic diagram of the multi-level angle positioning adjustment device of the present invention when the table board body is supported at the highest angle position;

[0036] Figure 6 It is a structural schematic diagram of the multi-stage angle positioning adjustment device of the present invention when it is in a flipped-up state;

[0037] Figure 7 It is a structural schematic diagram of the multi-stage angle positioning adjustment device of the present invention when it is in a flipped-down state;

[0038] Figure 8 It is a schematic diagram of the structure of the ratchet in the present invention;

[0039] Fig. 9 It is a schematic diagram of the structure of the ratchet and the bracket in the flipped-down state in the present invention;

[0040] Fig.10 It is a structural schematic diagram of the table top body in the present invention. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with embodiments:

[0042] Embodiment 1

[0043] like Figures 1 to 10 As shown, the present invention discloses a multi-stage angle positioning adjustment device, which is provided with a bracket 1, a rotating shaft 2, a ratchet 3, a cam 4, a fixed shaft 5, a pawl 6 and a torsion spring 7; wherein, a limiting column 3-1 is provided on the side of the ratchet 3, and the outer edge of the ratchet 3 is divided into a ratchet tooth segment 3a provided with a plurality of ratchet teeth 3-2 and a smooth segment 3b without ratchet teeth; the cam 4 is provided with an arc-shaped limiting groove 4a, and a first protrusion 4-1, a second protrusion 4-2 and a groove portion 4b located between the first protrusion 4-1 and the second protrusion 4-2 are provided on the outer edge of the cam 4;

[0044] The inner end of the rotating shaft 2 is mounted on the bracket 1, the ratchet 3 and the cam 4 are both sleeved on the middle part of the rotating shaft 2, and the ratchet 3 is fixed to the rotating shaft 2, the bracket 1 and the cam 4 can rotate around the rotating axis 2a of the rotating shaft 2, so that: the center of the circular arc limiting groove 4a falls on the rotating axis 2a, and the limiting column 3-1 extends into the circular arc limiting groove 4a;

[0045] The inner end of the fixed shaft 5 is fixed on the bracket 1, and the fixed shaft 5 is parallel to the rotating shaft 2. The pawl 6 and the torsion spring 7 are both rotatably mounted on the fixed shaft 5, and the inner end of the torsion spring 7 is fixed on the pawl 6, and the outer end is relatively fixed to the fixed shaft 5, so that: when the pawl 6 is driven by the bracket 1 rotating around the rotating axis 2a to stop at the ratchet tooth segment 3a, under the action of the torsion spring 7, one side of the pawl 6 clamps one of the ratchet teeth 3-2 of the ratchet 3, and the other side is located in the groove portion 4b of the cam 4, and when the pawl 6 is rotated around the rotating axis 2a in the positive FWD direction, the pawl 6 is rotated in the positive FWD direction. Driven by the rotating bracket 1, the pawl 6 can slide on each ratchet tooth 3-2 of the ratchet 3 along the positive FWD, and drive the cam 4 to rotate around the rotation axis 2a along the positive FWD by pushing the first protrusion 4-1, and when the pawl 6 slides along the positive FWD and exceeds the last ratchet tooth 3-2 of the ratchet 3 on the positive FWD, it drives the cam 4 to rotate to its extreme rotation angle on the positive FWD, so that the limit column 3-1 is at the starting end 4a1 of the arc-shaped limit groove 4a along the positive FWD.

[0046] The ratchet 3 and the cam 4 may be arranged in any of the following two ways:

[0047] Method 1: The ratchet wheel 3 is located on the inner side of the cam 4 (see Figure 1 ), then: the limiting column 3-1 is arranged on the outer side of the ratchet 3; when the pawl 6 is driven by the bracket 1 rotating around the rotation axis 2a to stay on the ratchet tooth segment 3a, under the action of the torsion spring 7, the inner side of the pawl 6 clamps one of the ratchet teeth 3-2 of the ratchet 3, and the outer side is located in the groove portion 4b of the cam 4;

[0048] Method 2: The ratchet 3 is located on the outside of the cam 4 (not shown in the figure), then: the limiting column 3-1 is set on the inner side of the ratchet 3; when the pawl 6 is driven by the bracket 1 rotating around the rotation axis 2a to stop at the ratchet tooth segment 3a, under the action of the torsion spring 7, the outer part of the pawl 6 clamps one of the ratchet teeth 3-2 of the ratchet 3, and the inner part is located in the groove portion 4b of the cam 4.

[0049] The present invention also discloses a car seat backrest table, which is provided with a table body 8 and the multi-stage angle positioning and adjusting device;

[0050] The table top body 8 is provided with a rotating shaft hole 8a, and the multi-stage angle positioning adjustment device is arranged on the inner side of the rotating shaft hole 8a. The outer end of the rotating shaft 2 passes through the rotating shaft hole 8a and extends to the outer side of the table top body 8, and the rotating shaft 2 can rotate in the rotating shaft hole 8a. The bracket 1, the outer end of the fixed shaft 5, and the outer end of the torsion spring 7 are all fixedly connected to the table top body 8; the outer end of the rotating shaft 2 is used to be fixedly connected to the car seat backrest.

[0051] The car seat back table board of the present invention can work in the use state, the flip-up state and the flip-down state. The specific working principle is as follows:

[0052] 1. Usage Status

[0053] like Figure 1 As shown, the table board body 8 is flipped upward to drive the bracket 1 to rotate around the rotation axis 2a along the positive FWD, so that the pawl 6 is driven to the ratchet tooth segment 3a. Under the action of the torsion spring 7, the pawl 6 first clamps the first ratchet tooth 3-2 of the ratchet 3 along the positive FWD. At this time, the table board body 8 is supported at the lowest angle position by the multi-stage angle positioning adjustment device; the table board body 8 is further flipped upward to make the pawl 6 rotate along the positive FWD on the ratchet 3. The table board body 8 slides on each ratchet tooth 3-2, and stops the upward flipping of the table board body 8 when the pawl 6 is in the ratchet tooth segment 3a, so that the pawl 6 is stuck in one of the multiple ratchet teeth 3-2 of the ratchet 3. At this time, the table board body 8 is supported by the multi-stage angle positioning adjustment device at any one of the second lowest angle position to the highest angle position. Therefore, the table board body 8 of the present invention is supported by the multi-stage angle positioning adjustment device at multiple angle positions. The rear passengers can choose to support the table board body 8 at a suitable angle position according to the inclination angle of the front car seat back, so as to adjust the table board body 8 to a horizontal state for the convenience of the rear passengers.

[0054] 2. Upward state

[0055] like Figure 6 As shown, when the table board body 8 is supported at the highest angle position by the multi-stage angle positioning adjustment device, the pawl 6 clamps the last ratchet tooth 3-2 of the ratchet 3 along the forward FWD (see Figure 5); at this time, the table board body 8 is further flipped upward, so that the pawl 6 drives the cam 4 to rotate to its extreme rotation angle in the positive FWD, that is, the limiting column 3-1 is at the starting end 4a1 of the arc-shaped limiting groove 4a along the positive FWD. Due to the limiting effect of the limiting column 3-1 of the ratchet 3 on the cam 4 through the arc-shaped limiting groove 4a, the cam 4 cannot continue to rotate around the rotation axis 2a along the positive FWD, so that the pawl 6 is at the first end of the cam 4. The table top body 8 is blocked by a protrusion 4-1 and then lifted up to separate from the ratchet teeth 3-2 of the ratchet 3. Under the action of the torsion spring 7, the pawl 6 is pressed on the first protrusion 4-1 of the cam 4 and slides along the positive FWD, thereby realizing the automatic unlocking of the multi-stage angle positioning adjustment device. In addition, the table top body 8 can continue to flip upward to a state where its front side 8b is in contact with the backrest of the front car seat, so as to temporarily retract the table top body 8, making it easier for rear passengers to enter and exit their seats without being blocked by the table top on the car seat back.

[0056] 3. Flip down state

[0057] like Figure 7 As shown, after the multi-stage angle positioning adjustment device is automatically unlocked, that is, the pawl 6 is separated from the ratchet teeth 3-2 of the ratchet 3 as the table board body 8 is flipped upward, the table board body 8 is flipped downward, driving the bracket 1 to rotate around the rotation axis 2a along the reverse REV, so that the pawl 6 pressed on the first protrusion 4-1 drives the cam 4 to rotate around the rotation axis 2a along the reverse REV until the cam 4 is driven to rotate to its limit rotation angle on the reverse REV, that is, when the limiting column 3-1 of the ratchet 3 is at the end 4a2 of the circular arc limiting groove 4a along the forward FWD, due to the limiting effect of the limiting column 3-1 on the cam 4 through the circular arc limiting groove 4a, the cam 4 cannot continue to rotate around the rotation axis 2a along the reverse REV The bracket 1 continues to rotate in the reverse REV direction, driving the pawl 6 to slide on the first protrusion 4-1 of the cam 4 along the reverse REV direction, and the pawl 6 finally slides along the reverse REV direction until it abuts against the second protrusion 4-2 of the cam 4. Thus, the table board body 8 can be turned down to its back side 8c in the flipped-up state to fit with the backrest of the front car seat, so as to fold the table board body 8 when the rear passengers are not in use. At this time, the pawl 6 limits the cam 4 by abutting against the second protrusion 4-2, so that the cam 4 cannot rotate in the forward FWD direction.

[0058] In summary, the present invention utilizes a multi-stage angle positioning and adjustment device which is composed of a bracket 1, a rotating shaft 2, a ratchet 3, a cam 4, a fixed shaft 5, a pawl 6 and a torsion spring 7 through a clever assembly method, which can realize the support, automatic unlocking, temporary folding, and folding of the table board body 8 at multiple angle positions on the front car seat backrest, and the multi-stage angle positioning and adjustment device has a simple structure, is easy to assemble and process, and has a large supporting strength for the support of the table board body 8 at multiple angle positions. The locking and unlocking of the multi-stage angle positioning and adjustment device, that is, the support and folding of the table board body 8, can be achieved by simply flipping the table board body 8 upward or downward, and the operation is extremely simple and convenient. Therefore, the present invention has the advantages of simple structure, easy assembly, multi-stage adjustable table board support angle, large supporting strength, and simple and convenient operation, and the present invention can be applied to most car seats on the market.

[0059] Among them, since the ratchet 3 and the cam 4 are coaxially assembled on the rotating shaft 2, and the ratchet 3 and the cam 4 are used as the actuator, the multi-stage angle positioning adjustment device of the present invention has greater strength.

[0060] Embodiment 2

[0061] On the basis of the above-mentioned embodiment 1, this embodiment 2 also adopts the following preferred structure:

[0062] like Figure 8 and Fig. 9 As shown, the bracket 1 is provided with a limiting boss 1-1, and the smooth section 3b of the ratchet 3 is provided with an arc-shaped groove 3c. When the bracket 1 drives the cam 4 to rotate around the rotation axis 2a along the reverse REV through the pawl 6, so that the limiting boss 3-1 is located behind the end end 4a2 of the arc-shaped limiting groove 4a along the forward FWD, and the bracket 1 continues to rotate around the rotation axis 2a along the reverse REV to a certain position, the limiting boss 1-1 can be stuck in the arc-shaped groove 3c.

[0063] The location of the arc-shaped groove 3c on the smooth section 3b depends on the angle at which the back side 8c of the table board body 8 is rotated to fit the backrest of the front row car seat, so that:

[0064] When the car seat back table of the present invention is working in the flipped-down state, the ratchet 3 drives the cam 4 to rotate to its limit rotation angle in the reverse REV direction, that is, the limit post 3-1 of the ratchet 3 is located before the end 4a2 of the arc-shaped limit groove 4a along the forward FWD, and the bracket 1 The limiting convex column 1-1 does not reach the position of the arc-shaped groove 3c, which has no effect on the downward flipping of the table board body 8. After the limiting column 3-1 is at the end 4a2 of the arc-shaped limiting groove 4a along the forward FWD, when the back 8c of the table board body 8 fits with the backrest of the front car seat, the limiting convex column 1-1 is stuck in the arc-shaped groove 3c. Under the constraint of the ratchet 3, the rotation of the bracket 1 is limited, that is, the flipping of the table board body 8 is limited to reduce the shaking and flapping of the table board body 8, ensuring that the back 8c of the table board body 8 is kept in contact with the backrest of the front car seat without external force. When the rear passengers need to use the table board, they can flip the table board body 8 upward with appropriate force to disengage the limiting convex column 1-1 from the arc-shaped groove 3c.

[0065] Embodiment 3

[0066] On the basis of the above-mentioned embodiment 1 or embodiment 2, this embodiment 3 further adopts the following preferred structure:

[0067] The bracket 1 is provided with a rotating shaft mounting hole 1a and a fixed shaft mounting hole 1b, the inner end portion of the rotating shaft 2 is rotatably mounted in the rotating shaft mounting hole 1a of the bracket 1 so that the bracket 1 can rotate around the axis of the rotating shaft 2, and the inner end portion of the fixed shaft 5 is fixed in the fixed shaft mounting hole 1b of the bracket 1; the ratchet 3 is preferably welded and fixed on the rotating shaft 2, but the rotation and axial movement between the ratchet 3 and the rotating shaft 2 can also be limited by matching limiting convex edges and limiting groove structures; the pawl 6 is provided with a torsion spring mounting hole 6a, and the inner end of the torsion spring 7 is fixed in the torsion spring mounting hole 6a of the pawl 6.

[0068] Embodiment 4

[0069] Based on any one of the above embodiments 1 to 3, this embodiment 4 also adopts the following preferred structure:

[0070] like Figure 3 and Figure 4As shown, the table board body 8 is provided with a table board surface 8-1 and a left side edge 8-2 and a right side edge 8-3 respectively arranged on the left and right sides of the table board surface 8-1, and each of the left side edge 8-2 and the right side edge 8-3 is provided with a rotation axis hole 8a, and the rotation axis hole 8a on the left side edge 8-2 is coaxial with the rotation axis hole 8a on the right side edge 8-3; the car seat back table board is provided with two of the multi-stage angle positioning adjustment devices;

[0071] For one of the multi-stage angle positioning adjustment devices, the outer end of its rotating shaft 2 passes through the rotating shaft hole 8a on the left side 8-2 to the outside of the left side 8-2, the outer end of its fixed shaft 5 and the outer end of the torsion spring 7 are both fixed to the left side 8-2, and its bracket 1 is fixed to the back side of the table surface 8-1, that is, the back side 8c of the table body 8;

[0072] For the other multi-stage angle positioning and adjustment device, the outer end of its rotating shaft 2 passes through the rotating shaft hole 8a on the right side edge 8-3 to the outside of the right side edge 8-3, the outer end of its fixed shaft 5 and the outer end of the torsion spring 7 are both fixed on the right side edge 8-3, and its bracket 1 is fixed on the back side of the table top surface 8-1, that is, the back side 8c of the table top body 8.

[0073] Among them, preferably: the table top body 8 is also provided with a rear side edge 8-4, and the rear side edge 8-4 is arranged on the rear side of the table top surface 8-1; the bracket 1 of the multi-stage angle positioning adjustment device is also fixed on the rear side edge 8-4.

[0074] Among them, preferably: the left side 8-2 and the right side 8-3 are both provided with a fixed shaft hole 8d for fixing the outer end of the fixed shaft 5 and a torsion spring fixing hole 8e for fixing the outer end of the torsion spring 7; the bracket 1 is fixedly connected to the back side of the table top surface 8-1 and the rear side 8-4 respectively by bolts 9.

[0075] Embodiment 5

[0076] Based on any one of the above embodiments 1 to 4, this embodiment 5 also adopts the following preferred structure:

[0077] A fixing plate 10 is fixed to the outer end of the rotating shaft 2, and the fixing plate 10 is used to be fixedly connected to the car seat backrest by bolts. The fixing plate 10 is preferably provided with a waist-shaped hole 10a, and the outer end of the rotating shaft 2 is bolted in the waist-shaped hole 10a of the fixing plate 10.

[0078] Embodiment 6

[0079] Based on any one of the above embodiments 1 to 5, this embodiment 6 also adopts the following preferred structure:

[0080] The back side of the table top surface 8-1, that is, the back side 8c of the table top body 8, is provided with honeycomb reinforcing ribs 8-5.

[0081] The present invention is not limited to the above-mentioned specific implementation modes. According to the above-mentioned contents, in accordance with the common technical knowledge and customary means in the field, without departing from the above-mentioned basic technical ideas of the present invention, the present invention can also make other various forms of equivalent modifications, replacements or changes, all of which fall within the protection scope of the present invention.

Claims

1. A multi-stage angle positioning adjustment device, characterized in that: The multi-stage angle positioning adjustment device comprises a bracket (1), a rotating shaft (2), a ratchet (3), a cam (4), a fixed shaft (5), a pawl (6) and a torsion spring (7); wherein a limiting column (3-1) is provided on the side of the ratchet (3); the outer edge of the ratchet (3) is divided into a ratchet tooth section (3a) provided with a plurality of ratchet teeth (3-2) and a smooth section (3b) without ratchet teeth; the cam (4) is provided with an arc-shaped limiting groove (4a); and a first protrusion (4-1), a second protrusion (4-2) and a groove section (4b) located between the first protrusion (4-1) and the second protrusion (4-2) are provided on the outer edge of the cam (4); The inner end of the rotating shaft (2) is mounted on the bracket (1); the ratchet (3) and the cam (4) are both mounted on the middle of the rotating shaft (2); the ratchet (3) and the rotating shaft (2) are fixed to each other; the bracket (1) and the cam (4) are both capable of rotating around the rotating axis (2a) of the rotating shaft (2), so that: the center of the circular arc limiting groove (4a) falls on the rotating axis (2a), and the limiting column (3-1) extends into the circular arc limiting groove (4a); The inner end of the fixed shaft (5) is fixed on the bracket (1), the fixed shaft (5) is parallel to the rotating shaft (2), the pawl (6) and the torsion spring (7) are both rotatably mounted on the fixed shaft (5), and the inner end of the torsion spring (7) is fixed on the pawl (6), and the outer end is relatively fixed to the fixed shaft (5), so that: when the pawl (6) is driven by the bracket (1) rotating around the rotating axis (2a) to stop on the ratchet tooth segment (3a), under the action of the torsion spring (7), one side of the pawl (6) is clamped on one of the ratchet teeth (3-2) of the ratchet (3), and the other side is located in the groove portion (4b) of the cam (4), and when rotating around the rotating axis (2a), the pawl (6) is rotated to the outer end of the torsion spring (7). Driven by the bracket (1) rotating in the forward direction (FWD), the pawl (6) can slide on each ratchet tooth (3-2) of the ratchet wheel (3) in the forward direction (FWD), and drive the cam (4) to rotate in the forward direction (FWD) around the rotation axis (2a) by pushing the first protrusion (4-1); and, when the pawl (6) slides in the forward direction (FWD) beyond the last ratchet tooth (3-2) of the ratchet wheel (3) in the forward direction (FWD), it drives the cam (4) to rotate to its limit rotation angle in the forward direction (FWD), so that the limiting column (3-1) slides to the starting end (4a1) of the arc-shaped limiting groove (4a) in the forward direction (FWD); The bracket (1) is provided with a limiting convex column (1-1), and a circular arc groove (3c) is provided on the smooth section (3b) of the ratchet wheel (3); when the bracket (1) drives the cam (4) to rotate in the reverse direction (REV) around the rotation axis (2a) through the ratchet pawl (6), so that the limiting column (3-1) is located behind the rear end (4a2) of the circular arc limiting groove (4a) in the forward direction (FWD), and when the bracket (1) continues to rotate in the reverse direction (REV) around the rotation axis (2a) to a certain position, the limiting convex column (1-1) can be stuck in the circular arc groove (3c); The bracket (1) is provided with a rotating shaft mounting hole (1a) and a fixed shaft mounting hole (1b); the inner end of the rotating shaft (2) is rotatably mounted in the rotating shaft mounting hole (1a) of the bracket (1); the inner end of the fixed shaft (5) is fixed in the fixed shaft mounting hole (1b) of the bracket (1); the ratchet (3) is welded and fixed on the rotating shaft (2); the pawl (6) is provided with a torsion spring mounting hole (6a), and the inner end of the torsion spring (7) is fixed in the torsion spring mounting hole (6a) of the pawl (6).

2. The multi-stage angle positioning adjustment device according to claim 1, characterized in that: The ratchet (3) and the cam (4) are arranged in any one of the following two ways: Mode 1: The ratchet (3) is located on the inner side of the cam (4), then: the limiting column (3-1) is arranged on the outer side of the ratchet (3); when the pawl (6) is driven by the bracket (1) rotating around the rotation axis (2a) to stop on the ratchet tooth segment (3a), under the action of the torsion spring (7), the inner side of the pawl (6) clamps one of the ratchet teeth (3-2) of the ratchet (3), and the outer side is located in the groove (4b) of the cam (4); Mode 2: The ratchet (3) is located outside the cam (4), then: the limiting column (3-1) is arranged on the inner side surface of the ratchet (3); when the pawl (6) is driven by the bracket (1) rotating around the rotation axis (2a) to stop on the ratchet tooth segment (3a), under the action of the torsion spring (7), the outer side of the pawl (6) clamps one of the ratchet teeth (3-2) of the ratchet (3), and the inner side is located in the groove portion (4b) of the cam (4).

3. A car seat backrest table, comprising a table body (8), characterized in that: The car seat back table is also provided with the multi-stage angle positioning adjustment device as claimed in claim 1 or 2; The table top body (8) is provided with a rotating shaft hole (8a), the multi-stage angle positioning adjustment device is arranged on the inner side of the rotating shaft hole (8a), the outer end of the rotating shaft (2) passes through the rotating shaft hole (8a) and extends to the outer side of the table top body (8), and the rotating shaft (2) can rotate in the rotating shaft hole (8a), the bracket (1), the outer end of the fixed shaft (5), and the outer end of the torsion spring (7) are all fixedly connected to the table top body (8); the outer end of the rotating shaft (2) is used to be fixedly connected to the backrest of the car seat.

4. The car seat back table according to claim 3, characterized in that: The table board body (8) is provided with a table board surface (8-1) and a left side edge (8-2) and a right side edge (8-3) respectively arranged on the left and right sides of the table board surface (8-1); each of the left side edge (8-2) and the right side edge (8-3) is provided with a rotation axis hole (8a), and the rotation axis hole (8a) on the left side edge (8-2) is coaxial with the rotation axis hole (8a) on the right side edge (8-3); the car seat back table board is provided with two of the multi-stage angle positioning adjustment devices; For one of the multi-stage angle positioning adjustment devices, the outer end of its rotating shaft (2) passes through the rotating shaft hole (8a) on the left side edge (8-2) to the outside of the left side edge (8-2), the outer end of its fixed shaft (5) and the outer end of the torsion spring (7) are both fixed to the left side edge (8-2), and its bracket (1) is fixed to the back of the table top surface (8-1); For another multi-stage angle positioning adjustment device, the outer end of its rotating shaft (2) passes through the rotating shaft hole (8a) on the right side edge (8-3) to the outside of the right side edge (8-3), the outer end of its fixed shaft (5) and the outer end of the torsion spring (7) are both fixed on the right side edge (8-3), and its bracket (1) is fixed on the back of the table top surface (8-1).

5. The car seat back table according to claim 4, characterized in that: The table top body (8) is also provided with a rear side edge (8-4), and the rear side edge (8-4) is arranged on the rear side of the table top surface (8-1); the bracket (1) of the multi-stage angle positioning adjustment device is also fixed on the rear side edge (8-4).

6. The car seat back table according to claim 5, characterized in that: The left side (8-2) and the right side (8-3) are both provided with a fixing shaft hole (8d) for fixing the outer end of the fixing shaft (5) and a torsion spring fixing hole (8e) for fixing the outer end of the torsion spring (7); the bracket (1) is fixedly connected to the back side of the table top (8-1) and the rear side (8-4) respectively by bolts (9).

7. The car seat back table according to any one of claims 3 to 6, characterized in that: A fixing plate (10) is fixed to the outer end of the rotating shaft (2), and the fixing plate (10) is used to be fixedly connected to the backrest of the automobile seat via bolts.

8. The car seat back table according to any one of claims 4 to 6, characterized in that: The back side of the table top surface (8-1) is provided with honeycomb-shaped reinforcing ribs (8-5).

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