Seat belt retraction and locking device, and automotive seat

Abstract

To provide a seat belt retractor and locking device with stable product performance. [Solution] A seat belt retracting and locking device or the like includes a seat belt retractor (1), a sensor having a sensing seat (21) and a sensing ball (22), and a locking mechanism (3) for locking the sensing seat (21). When the locking mechanism (3) is in a locked state, the sensing seat (21) is fixed in an initial position. When the locking mechanism (3) is in an unlocked state, the sensing seat (21) is rotatable about the axis of a first pivot shaft (212) and remains in the initial position. When the seat belt retracting and locking device (3) or the like is in a normal state, the sensing seat (21) is locked in the initial position, and its angle and position are not affected by changes in vehicle speed, and the relative positions between the sensing ball (22), the pawl (14), and the ratchet (13) do not change, improving the stability of product performance.

Description

Technical Field

[0001] (Claiming Priority) This application claims the priority of Chinese Patent Application No. 202111067644.9 filed on September 13, 2021, the entire content of which is incorporated herein by reference.

[0002] (Field of the Invention) The present invention relates to the technical field of sensing devices for seat belts, and particularly relates to seat belt retracting and locking devices and automotive seats.

Background Art

[0003] As shown in FIGS. 1 to 2, in the case of some vehicle models, the seat belt retracting and locking device 4' is mounted on the seat back 2', specifically, on the backrest frame of the seat back 2'. The seat back 2' is connected to the seat cushion 1' by a rotating shaft 3'. The seat back 2' can be rotated relative to the seat cushion 1' to adjust the angle.

[0004] The seat belt retracting and locking device 4' includes a seat belt retractor 41' and a sensor 42'. The seat belt retractor 41' includes a reel housing 411', a core shaft 412', a seat belt reel 413', a ratchet 414', and a pawl 415'. The core shaft 412' is mounted on the reel housing 411'. The seat belt reel 413' is sleeve-connected to the core shaft 412'. The ratchet 414' is located outside the reel housing 411'. The ratchet 414' is sleeve-connected to the core shaft 412'. The ratchet 414' is connected to one end of the seat belt reel 413'. The ratchet 414' and the seat belt reel 413' can rotate synchronously on the core shaft 412'. The pawl 415' is located outside the reel housing 411' and is connected to the reel housing 411' by a pawl pivot shaft. After the pawl 415' is triggered, it can rotate around the pawl pivot shaft so as to engage with the ratchet 414' to prevent the ratchet 414' from rotating, thereby preventing the seat belt reel 413' from rotating.

[0005] Sensor 42' includes a sensing sheet and a sensing ball located within a concave cavity of the sensing sheet. The sensing sheet is connected to the reel housing 411' by a sensing sheet pivot shaft. Sensor 42' can be mounted by a support. The sensing sheet can rotate back and forth about the sensing sheet pivot shaft.

[0006] In the normal state, the sensor 42' hangs naturally and the pawl 415' rests on the sensing ball. The pawl 415' is separated from the ratchet 414'. The seat belt reel 413' can rotate normally.

[0007] In emergency situations, such as when the vehicle suddenly decelerates or tilts, the sensing ball moves away from its initial position due to inertia and pushes the pawl 415' upward. The pawl 415' rotates around the pawl pivot shaft. One end of the toothed pawl 415' rotates upward and engages with the ratchet 414', thereby preventing the seat belt reel 413' from continuing to rotate and preventing the seat belt from being pulled out, thereby providing better protection for the occupant.

[0008] The sensor 42' of the prior art is connected to the rotating shaft 3' of the seat back 2' by a synchronizer, and the angle of the sensor 42' changes in accordance with the adjustment of the angle of the seat back 2'.

[0009] When the angle of the seat back 2' is adjusted, the angle and / or position of the sensor 42' may change due to an error in the synchronizer, which may affect the normal performance of the sensor 42'. [Overview of the project]

[0010] The object of the present invention is to provide a seat belt retraction and locking device, and an automobile seat. Under normal conditions, the sensing seat is locked in its initial position by the locking mechanism, so that its angle or position is not affected by changes in vehicle speed. When the angle of the seat back is adjusted, the locking mechanism unlocks the sensing seat, and the vehicle sensing seat always remains in its initial position, so that the relative position between the sensing ball, the pawl, and the ratchet does not change, thereby ensuring the stability of the product's performance. [Means for solving the problem]

[0011] The present invention provides a seat belt retracting and locking device for mounting on a seat back, comprising a seat belt retractor, a sensor having a sensing sheet and a sensing ball, and a locking mechanism for locking the sensing sheet, The seat belt retractor comprises a retractor housing for connecting to the backrest frame of the seat back, a core shaft mounted in the retractor housing, a seat belt reel sleeve-connected to the core shaft, a ratchet located outside the retractor housing and rotating synchronously with the seat belt reel, and a pawl pivotably mounted outside the retractor housing and triggered by a sensing ball to lock the ratchet. The sensing sheet is connected to the retractor housing by a first pivot shaft. The sensing sheet has a housing recess, and the sensing ball is at least partially located within the housing recess. The contact point of the claw rests on the sensing ball. The sensing sheet has an initial position, and the center of gravity of the sensing sheet in the initial position is located directly below the axis of the first pivot shaft. The locking mechanism is mounted on the retractor housing and located on one side of the sensor, and the locking mechanism has a locked state in which it locks the sensing seat when the seat back is locked, and an unlocked state in which it unlocks the sensing seat when the angle of the seat back is adjusted. When the locking mechanism is in the locked state, the sensing sheet is fixed in its initial position. A seatbelt retracting and locking device is provided, wherein when the locking mechanism is in the unlocked state, the sensing sheet is rotatable with respect to the axis of the first pivot shaft, and the sensing sheet remains in its initial position.

[0012] In an optional technical solution, the counterweight block is mounted on the sensing sheet, and the counterweight block is located directly below the axis of the first pivot shaft. When the locking mechanism is unlocked, the counterweight block holds the sensing sheet in its initial position.

[0013] In an optional technical solution, when the sensing ball is stationary within the housing recess, the center of gravity of the sensing ball is located directly above the counterweight block.

[0014] In an optional technical solution, a curved rack is provided on the side of the sensing sheet facing the opposite side of the accommodating recess, and the counterweight block is located between the two ends of the curved rack. The locking mechanism is located on one side of the sensing sheet. The locking mechanism comprises an expandable locking pin and a drive member for driving the locking pin toward the side of the sensing sheet, The end portion of the locking pin faces the curved rack having the locking pin teeth. When the locking pin teeth engage with the curved rack, the locking mechanism locks the sensing sheet. When the locking pin teeth are separated from the curved rack, the locking mechanism unlocks the sensing sheet.

[0015] In an optional technical solution, the driving member is an elastic element, When the elastic element is in a compressed state, the lock pin is separated from the curved rack. When the elastic element is released, the locking pin engages with the curved rack.

[0016] In an optional technical solution, the seat belt retraction and locking device comprises an electromagnetic actuator for driving an elastic element to switch between a compressed state and an uncompressed state, The system comprises an electromagnet that can compress an elastic element when powered on, and a controller connected to the vehicle computer that can control the on / off switching of the electromagnet's power. Under normal conditions, the electromagnet is powered off, and the elastic element is released. The system further includes an electromagnetic actuator, which, when the controller receives a seatback angle adjustment signal transmitted by the vehicle computer, controls the power to an electromagnet to turn on, thereby compressing an elastic element.

[0017] In an optional technical solution, the seat belt retractor and locking device further comprises a tension cord for connecting between the rotating shaft of the seat adjuster and the locking pin. When the seat adjuster is in the locked state, the elastic element is in the released state, and the locking pin is engaged with the curved rack. When the seat adjuster is in the unlocked state, the tension cord pulls the locking pin away from the curved rack and compresses the elastic element.

[0018] In an optional technical solution, the curved rack has a first end and a second end disposed opposite to each other. The distance between the counterweight block and the first end is shorter than the distance between the counterweight block and the second end. When the seat back is in the vertical state, the locking pin is located below the curved rack and faces the counterweight block. When the seat back is tilted backward to be horizontal, the locking pin is located on the front side of the curved rack and faces the second end.

[0019] In an optional technical solution, the claw is connected to the retractor housing by the second pivot shaft. The first pivot shaft is parallel to the rotating shaft of the seat back, and the second pivot shaft and the core shaft are each parallel to the first pivot shaft.

[0020] In the technical solution of the present invention, an automotive seat comprises a seat back and a seat belt retractor and locking device according to any one of the foregoing technical solutions. The retractor housing is fixedly connected to the backrest frame of the seat back. When the seat back is locked, the locking mechanism locks the sensing seat. When the angle of the seat back is adjusted, the locking mechanism unlocks the sensing seat, and an automotive seat is further provided.

[0021] By using the above technical solutions, the following beneficial effects can be achieved.

[0022] In the seat belt retraction and locking device and automobile seat provided by the present invention, under normal conditions, the sensing seat is locked to its initial position by the locking mechanism, and therefore the angle and position of the sensing seat are not affected by changes in vehicle speed.

[0023] When the vehicle is operating normally, the pawl is disengaged from the ratchet, and the seat belt retractor can operate normally. In emergencies, such as when the vehicle brakes suddenly or tilts, due to inertia, the sensing ball moves forward and upward along the recessed wall of the housing recess, thereby triggering the pawl to engage with the ratchet, which prevents the seat belt reel from continuing to rotate and prevents the seat belt from being pulled out, thereby providing a protective effect.

[0024] When the seatback angle is adjusted, the seatbelt retractor and locking mechanism rotate with the seatback. However, the sensing seat always remains in its initial position, and the sensing ball is substantially stationary. Therefore, the relative position between the sensing ball, the pawl, and the ratchet does not change, thereby improving the stability of the product's performance. [Brief explanation of the drawing]

[0025] [Figure 1] This is a schematic diagram of a seat belt retraction and locking device mounted on the seat back, according to prior art. [Figure 2] This is a schematic diagram of the seat belt retraction and locking device in prior art. [Figure 3] This is a schematic diagram showing the relative positions of the locking mechanism, sensor, claw, and ratchet when the seat back is in a vertical position and the locking mechanism is locking the sensing seat. [Figure 4]This is a schematic diagram showing the relative positions of the locking mechanism, sensor, claw, and ratchet when the seat back is in a vertical position and the locking mechanism has released the seat. [Figure 5] This is a schematic diagram showing the relative positions of the locking mechanism, sensor, claw, and ratchet when the seat back is tilted backward and the locking mechanism is locking the sensing seat. [Figure 6] This is a schematic diagram showing the relative positions of the locking mechanism, sensor, claw, and ratchet when the seat back is tilted backward and the locking mechanism senses and unlocks the seat. [Figure 7] This is a schematic diagram showing the relative positions of the locking mechanism, sensor, claw, and ratchet when the seat back is tilted backward to a horizontal position and the locking mechanism is locking the sensing seat. [Figure 8] This is a schematic diagram showing the relative positions of the locking mechanism, sensor, claw, and ratchet when the seatback is tilted backward to a horizontal position and the locking mechanism senses and unlocks the seat. [Figure 9] This is a schematic diagram of the sensor's structure. [Figure 10] This is a schematic diagram of the electromagnetic actuator, locking pin, and elastic element. [Figure 11] This is a schematic diagram of the lock pin engaged with the curved rack when the seat adjuster is in the locked position and the elastic element is released. [Figure 12] This is a schematic diagram of a tension cord that compresses the elastic element by pulling the lock pin away from the curved rack when the seat adjuster is in the unlocked position. [Figure 13] This is a schematic diagram of a seat belt retraction and locking device mounted on the seat back. [Figure 14] This is a schematic diagram of a seatback in a vertical position. [Figure 15] This is a schematic diagram of a seatback that is tilted backward. [Figure 16] This is a schematic diagram of a seatback that is tilted backward to a horizontal position. [Modes for carrying out the invention]

[0026] Specific embodiments of the present invention will be further described below with reference to the accompanying drawings. The same parts will be represented by the same reference numerals. Note that the terms “front,” “rear,” “left,” “right,” “top,” and “bottom” used in the following description refer to directions in the accompanying drawings, and the terms “inside” and “outside” refer to directions toward or away from the geometric center of a particular component, respectively.

[0027] As shown in Figures 2 to 9 in conjunction with Figures 13 to 16, a seat belt retracting and locking device 100 for mounting on a seat back 301, provided by one embodiment of the present invention, includes a seat belt retractor 1, a sensor 2 having a sensing sheet 21 and a sensing ball 22, and a locking mechanism 3 for locking the sensing sheet 21.

[0028] The seat belt retractor 1 includes a retractor housing 11 for connection to the backrest frame of a seat back 301, a core shaft 12 mounted in the retractor housing 11, a seat belt reel (not shown) sleeve-connected to the core shaft 12, a ratchet 13 located outside the retractor housing 11 and rotating synchronously with the seat belt reel, and a pawl 14 pivotably mounted outside the retractor housing 11 and triggered by a sensing ball 22 to lock the ratchet 13.

[0029] The sensing sheet 21 is connected to the retractor housing 11 by a first pivot shaft 212.

[0030] The sensing sheet 21 is provided with a housing recess 211, and the sensing ball 22 is at least partially located within the housing recess 211.

[0031] The contact portion 141 of the claw 14 rests on the sensing ball 22.

[0032] The sensing sheet 21 has an initial position, and the center of gravity of the sensing sheet 21 in the initial position is located directly below the axis of the first pivot shaft 212.

[0033] The locking mechanism 3 is mounted on the retractor housing 11 and is located on one side of the sensor 2. The locking mechanism 3 has a locked state in which it locks the sensing seat 21 when the seat back 301 is locked, and an unlocked state in which it unlocks the sensing seat 21 when the angle of the seat back 301 is adjusted.

[0034] When the locking mechanism 3 is in the locked state, the sensing sheet 21 is fixed in its initial position.

[0035] When the locking mechanism 3 is in the unlocked state, the sensing sheet 21 is rotatable around the axis of the first pivot shaft 212, and the sensing sheet 21 remains in its initial position.

[0036] The seat belt retracting and locking device 100 provided by the present invention is used to be attached to the seat back 301 of an automobile seat 300. The seat belt retracting and locking device 100 includes a seat belt retractor 1, a normal lock sensor 2, and a locking mechanism 3 for normally locking the sensing seat 21.

[0037] The seat belt retractor 1 includes a retractor housing 11, a core shaft 12, a seat belt reel, a ratchet 13, and a pawl 14. The core shaft 12 is mounted in the retractor housing 11. The seat belt reel is sleeve-connected to the core shaft 12. For information on the mounting of the seat belt reel, please refer to the description of the seat belt reel in the background art. When the seat belt reel rotates normally around the core shaft 12, the seat belt can be pulled out normally. When the seat belt reel is restricted from rotating around the core shaft 12, the seat belt is locked and cannot be pulled out any further.

[0038] The ratchet 13 is located on the outside of the retractor housing 11. The ratchet 13 is sleeve-connected to the core shaft 12. The ratchet 13 is fixedly connected to one end of the seat belt reel. The ratchet 13 and the seat belt reel can rotate synchronously around the core shaft 12. The pawl 14 and the ratchet 13 are located on the same side of the retractor housing 11. The pawl 14 is connected to the retractor housing 11 by a second pivot shaft 142. The pawl 14 has a contact portion 141 that extends toward the sensing ball 22. One end of the pawl 14 has teeth for engaging with the ratchet 13.

[0039] The permanent lock sensor 2 includes a sensing sheet 21 and a sensing ball 22.

[0040] The sensor 2, ratchet 13, and pawl 14 are located on the same side of the retractor housing 11. The pawl 14 is located between the sensor 2 and the ratchet 13.

[0041] The first pivot shaft 212 is connected to the sensing seat 21 and extends in the width direction (vehicle width direction) of the seat back 301. The sensing seat 21 is connected to the retractor housing 11 by the first pivot shaft 212.

[0042] The sensing sheet 21 has a housing recess 211. A portion of the sensing ball 22 is located within the housing recess 211, and a portion of the sensing ball 22 protrudes from the housing recess 211. In the normal state, the contact portion 141 of the claw 14 rests on the sensing ball 22.

[0043] The locking mechanism 3 is mounted on the outside of the retractor housing 11, and the locking mechanism 3 and the sensor 2 are located on the same side of the retractor housing 11. Under normal conditions, the locking mechanism 3 locks the sensing seat 21. When the angle of the seat back 301 is adjusted, both the seat belt retractor 1 and the locking mechanism 3 rotate together with the seat back 301 around the rotation shaft 303.

[0044] The sensing sheet 21 has the following two means for connecting to the first pivot shaft 212.

[0045] First connection means: The sensing sheet 21 is fixed to the first pivot shaft 212, and the first pivot shaft 212 is pivotally connected to the retractor housing 11. When the locking mechanism 3 unlocks the sensing sheet 21, the sensing sheet 21 and the first pivot shaft 212 rotate together relative to the retractor housing 11.

[0046] Second connection means: The sensing sheet 21 is rotatably mounted on the first pivot shaft 212, and the first pivot shaft 212 is fixed to the retractor housing 11. When the locking mechanism 3 unlocks the sensing sheet 21, the sensing sheet 21 can rotate relative to the first pivot shaft 212.

[0047] Regardless of whether the sensing sheet 21 is fixedly or rotatably (pivotably) connected to the first pivot shaft 212, when the locking mechanism 3 unlocks the sensing sheet 21, the sensing sheet 21 can rotate relative to the axis of the first pivot shaft 212.

[0048] When the sensor 2 is mounted on the retractor housing 11, the sensing sheet 21 has an initial position, and the center of gravity of the sensing sheet 21 in the initial position is located directly below the axis of the first pivot shaft 212, so that the sensing sheet 21 remains in a vertical position.

[0049] The locked and unlocked states of the locking mechanism 3 correspond to the locked and adjustable states of the seat back 301. When the seat back 301 is locked, the locking mechanism 3 enters a locked state and locks the sensing seat 21. When the angle of the seat back 301 is adjusted, the locking mechanism 3 enters an unlocked state and unlocks the sensing seat 21.

[0050] The locking mechanism 3 can be selected from mechanisms such as a locking pin, latch bolt, bolt, push rod, and stop arm. Any mechanism that can lock and unlock the sensing sheet 21 can be considered the locking mechanism 3.

[0051] The locked and unlocked states of the locking mechanism 3 may be configured to be operated manually as desired, or to be configured to be operated automatically as desired.

[0052] When the locking mechanism 3 locks the sensing seat 21, the sensing seat 21 is positioned in its initial position. In situations such as when the vehicle brakes suddenly or tilts, under the action of inertial force, the sensing ball 22 rolls forward within the housing recess 211 and moves upward along the recessed wall on the front surface of the housing recess 211, thereby pushing up the contact portion 141 of the claw 14, so that the claw 14 rotates around the second pivot shaft 142. The front end of the toothed claw 14 rotates upward and engages with the ratchet 13, locking the ratchet 13, so that the seat belt reel does not rotate any further, thereby preventing the seat belt from being pulled out.

[0053] Therefore, in the case of the permanently locked sensor device provided by the present invention, unless the angle of the seat back 301 is adjusted, the sensing seat 21 is locked to its initial position by the locking mechanism 3, and thus the angle and position of the sensing seat 21 are not affected by changes in the vehicle's speed.

[0054] When the angle of the seat back 301 is adjusted, the seat belt retractor 1 and locking mechanism 3 rotate together with the seat back 301 around the rotating shaft 303. However, the sensing seat 21 rotates only around the axis of the first pivot shaft 212 and always remains in its initial position, and the sensing ball 22 also remains substantially stationary. As a result, the relative position between the sensing ball 22, the pawl 14, and the ratchet 13 does not change, thereby improving the stability of the product's performance.

[0055] In one embodiment, as shown in Figures 1 to 6, the counterweight block 213 is placed on the sensing sheet 21 and is located directly below the axis of the first pivot shaft 212.

[0056] When the locking mechanism 3 is in the unlocked state, the counterweight block 213 holds the sensing sheet 21 in its initial position.

[0057] In this embodiment, the counterweight block 213 is provided within the sensing sheet 21, and the counterweight block 213 is positioned directly below the axis of the first pivot shaft 212, thereby facilitating the maintenance of the center of gravity of the combination of the sensing sheet 21 and the counterweight block 213 directly below the axis of the first pivot shaft 212, and assisting the sensing sheet 21 to remain in its initial position when the locking mechanism 3 is in the unlocked state.

[0058] In one embodiment, when the sensing ball 22 is stationary in the housing recess 211, the center of gravity of the sensing ball 22 is located directly above the counterweight block 213, so that the center of gravity of the sensing ball 22, as well as the center of gravity of the combination of the sensing sheet 21 and the counterweight block 213, are located on the same vertical line, making it easier for the sensor 2 to remain in a vertical position.

[0059] In one embodiment, as shown in Figures 2 to 9, a curved rack 214 is provided on the side of the sensing sheet 21 facing the opposite side of the receiving recess 211, and the counterweight block 213 is located between the two ends of the curved rack 214.

[0060] The locking mechanism 3 is located on one side of the sensing sheet 21.

[0061] The locking mechanism 3 includes an expandable locking pin 31 and a drive member 32 for driving the locking pin 31 toward the side surface of the sensing sheet 21.

[0062] The end portion of the lock pin 31 facing the curved rack 214 has lock pin teeth 311.

[0063] When the locking pin teeth 311 engage with the curved rack 214, the locking mechanism 3 locks the sensing sheet 21.

[0064] When the locking pin teeth 311 are separated from the curved rack 214, the locking mechanism 3 unlocks the sensing sheet 21.

[0065] In this embodiment, a curved rack 214 is provided at the bottom of the sensing sheet 21, and the curved rack 214 and the sensing sheet 21 may be formed integrally. The counterweight block 213 is located between the two ends of the curved rack 214. That is, the center of gravity of the combination of the sensing sheet 21 and the counterweight block 213 is located between the two ends of the curved rack 214.

[0066] The locking mechanism 3 is located on one side of the sensing sheet 21 facing the opposite side of the sensing ball 22. The locking mechanism 3 includes an expandable locking pin 31 and a drive member 32. The locking pin 31 extends toward the curved rack 214, and the end portion of the locking pin 31 has locking pin teeth 311. The drive member 32 is used to drive the locking pin 31 toward the side of the sensing sheet 21 so that the locking pin teeth 311 engage with the curved rack 214. The drive member 32 may be an elastic member, a cylinder, or a motor that can drive the locking pin 31 to move linearly.

[0067] The locking mechanism 3 includes a support 33. The locking pin 31 passes through a through hole in the support 33 and is slidable relative to the support 33. The locking pin 31 has a connecting plate 34, and the drive member 32 is connected between the support 33 and the connecting plate 34.

[0068] In the normal state, the seat back 301 is locked. The drive member 32 drives the lock pin 31 to move toward the side of the curved rack 214, engaging the lock pin teeth 311 with the curved rack 214, at which point the lock mechanism 3 locks the sensing seat 21.

[0069] If it is necessary to adjust the angle of the seat back 301, an action may be taken to move the lock pin 31 away from the curved rack 214. When this happens, the lock mechanism 3 unlocks the sensing seat 21. Specifically, the lock pin 31 may be moved away from the curved rack 214 by turning off the drive member, resetting the drive member, or manually pulling the lock pin 31.

[0070] When the lock pin 31 rotates with the seat back 301, the distance between the lock pin 31 and the curved rack 214 does not change, thereby facilitating the control of engagement or disengagement between the lock pin 31 and the curved rack 214.

[0071] In one embodiment, the drive member 32 is an elastic element 321.

[0072] When the elastic element 321 is in a compressed state, the lock pin 31 is separated from the curved rack 214.

[0073] When the elastic element 321 is in the released state, the lock pin 31 is engaged with the curved rack 214.

[0074] In this embodiment, the drive member 32 is an elastic element 321 such as an expansion spring or an elastic piece, thereby facilitating operation.

[0075] In the normal state, the elastic element 321 is released or spread to push up the connecting plate 24, thereby driving the lock pin 31 to engage with the curved rack 214.

[0076] If it is necessary to adjust the angle of the seat back 301, the lock pin 31 is pulled to overcome the force acting on the elastic element 321, or the elastic element 321 is compressed by an electromagnetic mechanism, thereby separating the lock pin 31 from the curved rack 214.

[0077] In one embodiment, as shown in Figure 10, the seat belt retraction and locking device 100 further includes an electromagnetic actuator 4 for driving the elastic element 321 to switch between a compressed state and an uncompressed state.

[0078] The electromagnetic actuator 4 includes an electromagnet 41 that can compress the elastic element 321 when the power is turned on, and a controller 42 connected to the vehicle computer 200 that can control the power on and off of the electromagnet 41.

[0079] Under normal conditions, the electromagnet 41 is powered off and the elastic element 321 is released.

[0080] When the controller 42 receives a seatback angle adjustment signal transmitted by the vehicle computer 200, the controller 42 controls the power supply of the electromagnet 41 to turn on, thereby compressing the elastic element 321.

[0081] The electromagnetic actuator 4 of this embodiment is applicable to button-type, key-type, or touch-type seat back adjustment switches. The electromagnetic actuator 4 includes an electromagnet 41, a controller 42, and a circuit board 43. The electromagnet 41 and the controller 42 are each connected to the circuit board 43. The electromagnet 41 may be mounted on a support 33. The circuit board 43 is used to supply power to the electromagnet 41. The controller 42 can turn the electromagnet 41 on and off by controlling the on and off of the power supply to the circuit. The vehicle computer 200 can monitor the operating status of the motor in the electrically adjustable seat, the state of the seat lock pin, user operation, etc., by sensors. Generally, if the user has not selected to adjust the seat back 301, the seat back 301 is always considered to be in the default locked state (normal state). The controller 42 can be controlled to turn off the power supply to the circuit, thereby turning off the power to the electromagnet 41. The electromagnet 41 in the normal state is in the power-off state. In this state, the electromagnet 41 does not exert an attractive force on the elastic element 321, and the elastic element 211 is in a released, extended, or expanded state, which can drive the lock pin 31 to extend and engage with the curved rack 214. When the user selects to adjust the seat back 301, the vehicle computer 200 sends a signal to the controller 42 to adjust the seat back angle. The controller 42 controls the circuit to close and turns on the electromagnet 41. When the electromagnet 41 is turned on, it generates a magnetic field that attracts the elastic element 321, so that the elastic element 321 is compressed and can pull the lock pin 31 and separate from the curved rack 214.

[0082] In one embodiment, as shown in Figures 11-12, the seat belt retraction and locking device 100 further includes a pull cord 5 for connecting the rotating shaft 61 of the seat adjuster 6 to the locking pin 31.

[0083] When the seat adjuster 6 is in the locked position, the elastic element 321 is in the released position and the lock pin 31 is engaged with the curved rack 214.

[0084] When the seat adjuster 6 is in the unlocked state, the pull cord 5 pulls the lock pin 31 away from the curved rack 214, compressing the elastic element 321.

[0085] The pull cord 5 of this embodiment is applicable to a handle-type seat back adjustment switch having a rotating shaft.

[0086] The seat adjuster 6 may be a handle, rocker, etc., and has a rotating shaft 61. One end of the pull cord 5 is connected to a locking pin 31, and the other end is wound around the rotating shaft 61. The rotating shaft 61 may be mounted on the rotating shaft 303 of the seat back 301 and the seat cushion 302.

[0087] When the seat adjuster 6 is in the locked state or the locked position (normal state), the seat back 301 is locked and the pull cord 5 does not act on the lock pin 31. The elastic element 211 is in the released state, extended state or expanded state and can be driven to extend the lock pin 31 and engage with the curved rack 214. When the seat adjuster 6 rotates to the unlocked state or the unlocked position, the rotating shaft 61 rotates accordingly to wind the pull cord 5, and the pull cord 5 pulls the lock pin 31 and compresses the elastic element 321, thereby separating the lock pin 31 from the curved rack 214.

[0088] In one embodiment, as shown in Figures 3 to 8, the curved rack 214 has a first end 2141 and a second end 2142 that are positioned opposite each other.

[0089] The distance between the counterweight block 213 and the first end 2141 is shorter than the distance between the counterweight block 213 and the second end 2142.

[0090] When the seat back 301 is in a vertical position, the lock pin 31 is located below the curved rack 214 and faces the counterweight block 213.

[0091] When the seat back 301 is tilted backward so that it is horizontal, the lock pin 31 is located on the front side of the curved rack 214 and faces the second end 2142.

[0092] The first end 2141 is the rear end of the curved rack 214, and the second end 2142 is the front end of the curved rack 214. The length of the curved rack 214 may decrease as the counterweight block 213 approaches the first end 2141.

[0093] If the radius of the curved rack 214 is r, then if the curved rack 214 is slightly longer than the arc of 1 / 2πr, it is possible to adjust the seat back 301 90° backward from the vertical position.

[0094] In one embodiment, the claw 14 is connected to the retractor housing 11 by a second pivot shaft 142. The first pivot shaft 212 is parallel to the rotating shaft 303 of the seat back 301, and the second pivot shaft 142 and the core shaft 12 are each parallel to the first pivot shaft 212, thereby facilitating the arrangement of the product structure, keeping the sensing seat 21 perpendicular to the vehicle width direction, and facilitating keeping the sensor 2 in a vertical position without vibration in the vehicle width direction.

[0095] As shown in Figures 13 to 16, an automotive seat 300 provided by one embodiment of the present invention includes a seat back 301 and a seat belt retraction and locking device 100 as described in any one of the embodiments described above.

[0096] The retractor housing 11 is fixedly connected to the backrest frame of the seat back 301.

[0097] When the seat back 301 is locked, the locking mechanism 3 locks the sensing seat 21.

[0098] When the angle of the seat back 301 is adjusted, the locking mechanism 3 unlocks the sensing seat 21.

[0099] The automobile seat 300 provided by the present invention includes a seat back 301, a seat cushion 302, a rotating shaft 303, and a seat belt winding and locking device 100.

[0100] For details regarding the structure, configuration, and operating principle of the seat belt retraction and locking device 100, please refer to the above description of the seat belt retraction and locking device 100. Further details will not be described again in this specification.

[0101] The seat back 301 is connected to the seat cushion 302 by a rotating shaft 303. The seat back 301 can be adjusted by rotating it around the rotating shaft 303 relative to the seat cushion 302. For adjustment means and adjustment mechanism of the seat back 301, refer to the contents of the prior art.

[0102] The locked and unlocked states of the locking mechanism 3 correspond to the locked and adjustable states of the seat back 301. When the seat back 301 is locked, the locking mechanism 3 enters the locked state and locks the sensing seat 21. When it is necessary to adjust the angle of the seat back 301, or when it is being adjusted, the locking mechanism 3 enters the unlocked state and unlocks the sensing seat 21.

[0103] Therefore, in the case of the automotive seat 300 provided by the present invention, unless the angle of the seat back 301 is adjusted, the sensing seat 21 is locked to its initial position by the locking mechanism 3, and thus the angle and position of the sensing seat 21 are not affected by changes in the vehicle speed.

[0104] When the angle of the seat back 301 is adjusted, the seat belt retractor 1 and locking mechanism 3 rotate together with the seat back 301. However, the sensing seat 21 rotates only around the axis of the first pivot shaft 212 and always remains in its initial position, and the sensing ball 22 also remains substantially stationary. As a result, the relative position between the sensing ball 22, the pawl 14, and the ratchet 13 does not change, thereby improving the stability of the product's performance.

[0105] Depending on the requirements, the above technical solutions can be combined to achieve the optimal technical effect.

[0106] The above description is merely an illustration of the principles and preferred examples of the present invention. It should be noted that other modifications may be made by those skilled in the art based on the principles of the present invention, and such modifications should be interpreted as falling within the scope of the protection of the present invention.

Claims

1. A seat belt retracting and locking device (100) for mounting on a seat back (301) is characterized by comprising a seat belt retractor (1), a sensor having a sensing sheet (21) and a sensing ball (22), and a locking mechanism (3) for locking the sensing sheet (21), The seat belt retractor (1) comprises a retractor housing (11) for connecting to the backrest frame of the seat back (301), a core shaft (12) mounted in the retractor housing (11), a seat belt reel sleeve-connected to the core shaft (12), a ratchet (13) located outside the retractor housing (11) and rotating synchronously with the seat belt reel, and a pawl (14) pivotably mounted outside the retractor housing (11) and triggered by the sensing ball (22) to lock the ratchet (13), The sensing sheet (21) is connected to the retractor housing (11) by the first pivot shaft (212), The sensing sheet (21) has a housing recess (211), and the sensing ball (22) is at least partially located within the housing recess (211). The contact portion of the claw (14) rests on the sensing ball (22), The sensing sheet (21) has an initial position, and the center of gravity of the sensing sheet (21) in the initial position is located directly below the axis of the first pivot shaft (212). The locking mechanism (3) is mounted on the retractor housing (11) and positioned on one side of the sensor, and the locking mechanism (3) has a locked state in which the sensing seat (21) is locked when the seat back (301) is locked, and an unlocked state in which the sensing seat (21) is unlocked when the angle of the seat back (301) is adjusted. When the locking mechanism (3) is in the locked state, the sensing sheet (21) is fixed in the initial position. When the locking mechanism (3) is in the unlocked state, the sensing sheet (21) is rotatable with respect to the axis of the first pivot shaft (212), and the sensing sheet (21) remains in the initial position. Seat belt retraction and locking device (100).

2. The counterweight block (213) is mounted on the sensing sheet (21), and the counterweight block (213) is located directly below the axis of the first pivot shaft (212). The seat belt winding and locking device (100) according to claim 1, wherein when the locking mechanism (3) is in the unlocked state, the counterweight block (213) causes the sensing sheet (21) to remain in the initial position.

3. The seat belt winding and locking device (100) according to claim 2, wherein when the sensing ball (22) is stationary in the housing recess (211), the center of gravity of the sensing ball (22) is located directly above the counterweight block (213).

4. A curved rack (214) is provided on the side of the sensing sheet (21) facing the opposite side of the receiving recess (211), and the counterweight block (213) is located between the two ends of the curved rack (214). The locking mechanism (3) is located on one side of the sensing sheet (21), The locking mechanism (3) comprises an expandable locking pin (31) and a drive member (32) for driving the locking pin (31) toward the side surface of the sensing sheet (21), The lock pin (31) has lock pin teeth (311) at the end facing the curved rack (214), When the locking pin teeth (311) engage with the curved rack (214), the locking mechanism (3) locks the sensing sheet (21). When the locking pin teeth (311) are separated from the curved rack (214), the locking mechanism (3) unlocks the sensing sheet (21). The seat belt retraction and locking device (100) according to claim 2.

5. The driving member (32) is an elastic element (321), When the elastic element (321) is in a compressed state, the lock pin (31) is separated from the curved rack (214). When the elastic element (321) is in the released state, the lock pin (31) is engaged with the curved rack (214). The seat belt retraction and locking device (100) according to claim 4.

6. The seat belt winding and locking device (100) further comprises an electromagnetic actuator (4) for driving the elastic element (321) to switch between the compressed state and the released state, The electromagnetic actuator (4) comprises an electromagnet (41) that can compress the elastic element (321) when the power is turned on, and a controller (42) connected to a vehicle computer (200) that can control the on / off switching of the electromagnet (41). Under normal conditions, the electromagnet (41) is in the power-off state, and the elastic element (321) is in the release state. When the controller (42) receives the angle adjustment signal for the seat back (301) transmitted by the vehicle computer (200), the controller (42) controls the power supply of the electromagnet (41) to turn on, thereby compressing the elastic element (321). The seat belt retraction and locking device (100) according to claim 5.

7. The seat belt winding and locking device (100) further comprises a pull cord (5) for connecting the rotating shaft (61) of the seat adjuster (6) and the lock pin (31), When the seat adjuster (6) is in the locked state, the elastic element (321) is in the released state, and the lock pin (31) is engaged with the curved rack (214). When the seat adjuster (6) is in the unlocked state, the pull cord (5) pulls the lock pin (31) away from the curved rack (214) and compresses the elastic element (321). The seat belt retraction and locking device (100) according to claim 5.

8. The curved rack (214) has a first end (2141) and a second end (2142) that are arranged opposite to each other, The distance between the counterweight block (213) and the first end (2141) is shorter than the distance between the counterweight block (213) and the second end (2142). When the seat back (301) is in a vertical position, the lock pin (31) is located below the curved rack (214) and faces the counterweight block (213). When the seat back (301) is tilted backward so that it is horizontal, the lock pin (31) is located on the front side of the curved rack (214) and faces the second end (2142). The seat belt retraction and locking device (100) according to claim 4.

9. The claw (14) is connected to the retractor housing (11) by a second pivot shaft (142), The first pivot shaft (212) is parallel to the rotating shaft of the seat back (301), and the second pivot shaft (142) and the core shaft (12) are each parallel to the first pivot shaft (212). The seat belt retraction and locking device (100) according to claim 1.

10. An automobile seat, characterized by comprising a seat back (301) and a seat belt retraction and locking device (100) according to any one of claims 1 to 9, The retractor housing (11) is fixedly connected to the backrest frame of the seat back (301), When the seat back (301) is locked, the locking mechanism (3) locks the sensing seat (21). When the angle of the seat back (301) is adjusted, the locking mechanism (3) unlocks the sensing seat (21). Car seats.

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