WO2014142508A1 - Seat belt retractor for securing equipment of baby seat - Google Patents

Abstract

The present invention relates to a seat belt retractor for securing equipment of a baby seat, which includes: a spool wound with a webbing; a frame for rotatably attaching the spool so as to receive the webbing wound around the spool; a flywheel gear with the center provided with a drive gear coaxial with the shaft of the spool and the peripheral surface formed with unidirectional teeth, the flywheel gear being mounted on one end of the spool so as to rotate along with the spool; a lever caught by the unidirectional teeth so as to allow the retraction of the webbing but not the release of the webbing if the webbing is released to a predetermined first length, the lever being released from the unidirectional teeth so as to allow both the retraction and the release of the webbing if the webbing is released to a predetermined second length by being retracted again after having been released to the predetermined first length; an integration plate provided with a following gear interlocking with the drive gear of the flywheel so as to rotate along with the spool and the flywheel gear, the integration plate having a first plate for adjusting the lever according to the released length of the webbing; and a sensing unit arranged adjacent to the lever for sensing whether the lever has been adjusted by the first plate so as to secure the equipment of a baby seat.

Description

Retractors for seat belts to check infant seating

The present invention relates to a seat belt retractor capable of confirming whether or not an infant seat is installed, and more particularly, to a seat belt retractor capable of confirming whether or not an infant seat is installed by checking an operation of an automatic locking retractor. .

In general, the vehicle or the mechanism is provided with various safety devices to protect the occupant so as to prevent the occupant from leaving the vehicle or the apparatus due to collision between vehicles or other objects.

The representative ones will be a seat belt and an air bag. More specifically, the seat belt serves to stably secure the lower abdomen and the chest of the person occupied in the vehicle or apparatus to the seat to protect the occupant. If it is a safety device, the airbag is a safety device to protect the occupants by serving to create a balloon that can cushion the shock in front of the person in the vehicle or mechanism.

However, seat belts and airbags can protect the occupants from collisions between some vehicles or other objects only with these basic roles, but these basic roles are often insufficient when infant seats are installed for infants. .

That is, when the infant seat is mounted, there is a possibility that the infant seat is separated from the seat belt due to the collision between the vehicle or other objects due to the structure of the infant seat, which may further deteriorate the safety of the infant seated on the infant seat. If the airbag is activated, the volume of the balloon may interfere with the infant's breathing, further degrading the safety of the infant in the infant seat.

Therefore, a variety of technologies have been developed to compensate for such shortages, typically for seat belts in retractors, and for airbags for infant seat detection.

That is, an automatic locking retractor (ALR) function is added to the retractor mounted on the seat belt, and a sensing function for detecting whether the infant seat is mounted in the airbag module that controls the operation of the airbag is added. Thus, as described above, the insufficient safety can be compensated for.

However, in implementing the technology of adding such an automatic locking retractor function to the retractor and the infant seat detection function of the airbag module, it is quite difficult to integrate them. Is implemented.

Therefore, if it can be integrated and implemented, it will not only reduce the number of parts required to implement each technology, but will also protect the infant in the infant seat more stably and reliably.

In this regard, the inventors of the present invention are related to the seat belt retractor of the Republic of Korea Patent No. 10-1152602, which the inventors of the present invention have invented and patented, how to detect the infant seat in association with the airbag module. Much research and effort has been devoted to the possibility of adding.

The technical problem of the present invention is to provide a retractor for a seat belt that can determine whether or not the infant seat is installed by checking the operation of the automatic locking retractor.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned above may be clearly understood by those skilled in the art from the following description. There will be.

The technical problem, according to an embodiment of the present invention, the spool wound webbing; A frame to which the spool is rotatably coupled and to receive a webbing wound around the spool; A flywheel gear having a drive shaft coaxial with a rotation shaft of the spool at a central portion thereof, and having a one-way tooth formed along an outer circumferential surface thereof and mounted at one end of the spool to rotate with the spool; When the webbing is drawn out by a predetermined first length, the webbing is caught by the one-way teeth to allow the webbing to be pulled out, and the extraction is prevented, and after the webbing is drawn out by the preset first length, the second webbing is drawn back into the preset second. A lever for allowing both the drawing and withdrawal of the webbing away from the one-way tooth when drawn out by a length; An integrated plate having a driven gear interlocked with a drive gear of the flywheel gear to rotate with the spool and the flywheel gear and having a first plate for adjusting the lever according to the drawing length of the webbing; And a sensing unit which, when the lever is adjusted by the first plate, detects whether the lever is adjusted by using a sensor unit provided adjacent to the lever to determine whether the infant seat is mounted. It can be achieved by the retractor for seat belts can be confirmed whether the mounting.

Here, the first plate, the first outer circumferential surface in contact with the lever when the webbing is pulled out again after a predetermined first length, and the first plate is to be retracted after the webbing is drawn out by a second predetermined length And a second outer circumferential surface in contact with the lever, wherein the first outer circumferential surface and the second outer circumferential surface are formed as circumferential surfaces having different radii, and the lever is caught by the one-way teeth by changing the position of the lever while rotating. It can be adjusted to fall or fall.

In addition, the seat belt retractor that can determine whether the infant seat mounting according to an embodiment of the present invention is inclined sensor to prevent the extraction of the webbing is caught by the one-way teeth when the frame is inclined more than a predetermined angle The integrated plate may further include a second plate that is integrally formed on the first plate to determine whether the inclination sensor is operated.

The second plate may include a third outer circumferential surface and a fourth outer circumferential surface in contact with the inclination sensor, and the third outer circumferential surface may prevent the drawing of the webbing when the frame is inclined by a predetermined angle or more. To allow the inclination sensor to be caught by the one-way teeth, and the fourth outer circumferential surface to allow the webbing to be pulled out regardless of the inclination angle when the webbing is drawn out and drawn by a predetermined third length. It is possible to prevent the inclination sensor from being caught by the one-way teeth.

On the other hand, the lever, the flywheel gear and the body disposed adjacent to the integrated plate; A first protrusion protruding from the body and in contact with the first plate; A second protrusion that is spaced apart from the first protrusion and protrudes from the body and is caught by the one-way teeth when the webbing is drawn out by a predetermined first length; And a position fixing part which prevents the second protrusion from falling from the one-way tooth due to an external force generated when the webbing is retracted after the second protrusion is caught by the one-way tooth.

At this time, when the webbing is drawn out by a predetermined first length, the first protrusion is in contact with the first outer circumferential surface of the first plate, and the second protrusion is caught by the one-way teeth, so that the webbing is no longer able to be pulled out. When the webbing is drawn out after the predetermined first length and drawn out again by the second predetermined length, the first protrusion contacts the second outer circumferential surface of the first plate and the second protrusion Apart from the one-way teeth, the webbing can be retractable.

On the other hand, the sensing unit is based on whether the second protrusion is caught by the one-way teeth while the webbing is drawn out by a predetermined first length, the second protrusion is caught in the one-way teeth and then dropped It is confirmed that the infant seat is mounted, but after it is confirmed that the infant seat is mounted, the infant seat may be separated from the one-way tooth until the second protrusion is caught by the one-way tooth again. It can be confirmed that it is attached.

Here, the sensing unit may include a position sensor unit capable of detecting a relative position of the second protrusion, so as to determine whether the second protrusion is caught or away from the one-way teeth.

In this case, the position sensor unit is provided with a circuit board on which the Hall sensor is attached, a housing on which the circuit board is mounted on one surface, and the second protrusion, provided to face the second protrusion when the second protrusion is caught by the one-way teeth and falls. It includes a magnet member that enters inside the housing, When the magnet member enters the inside of the housing, the magnetic member and the Hall sensor is adjacent to change the strength of the current flowing through the Hall sensor, the current flowing through the Hall sensor By judging through the circuit board whether the intensity of the is changed, it is possible to check whether the second protrusion is caught or away from the one-way tooth. As described above, the second protrusion is caught by the one-way tooth. In the case of falling, it can be confirmed that the infant seat is mounted.

On the other hand, the sensing unit adjusts the position of the magnet member with respect to the housing before the second protrusion falls from the one-way teeth, and enters inside the housing when the second protrusion is caught by the one-way teeth again. It may further include an elastic member for repositioning the magnet member.

In addition, the sensing unit may include an induction protrusion protruding from one surface of the magnet member facing the second protrusion to assist the magnet member in entering the housing when the second protrusion falls from the one-way tooth. It may further include.

The position sensor unit may include a circuit board to which a hall sensor is attached and a magnet member mounted to the second protrusion, and the second protrusion is caught by the one-way teeth and then falls off. By determining through the circuit board whether the strength of the current flowing through the Hall sensor changes as the sensor is adjacent and the strength of the current flowing through the Hall sensor is changed, whether the second protrusion is caught in the one-way teeth or As described above, it is possible to confirm whether the second protruding part is caught by the one-way teeth and then detached from the infant seat as described above. Here, the magnet member responds to the Hall sensor. To obtain a first portion having a polarity and a second portion having a polarity opposite to the polarity of the first portion. In contrast, the first portion and the second portion may be formed in an asymmetrical shape so as to prevent the second portion from being mounted to the protruding portion facing the hall sensor.

In this case, the magnet member may be manufactured through injection so that the first portion and the second portion may be formed in an asymmetric shape with each other.

Meanwhile, the sensing unit may be connected to an electronic control unit (ECU) which determines whether or not to operate the airbag by checking whether the infant seat is installed.

According to the seat belt retractor that can determine whether the infant seat mounting according to the present invention, by checking the operation of the automatic locking retractor can determine whether the infant seat mounting.

In addition, due to the seat belt retractor that can determine whether or not the infant seat mounting according to the present invention, in the seat belt to protect the infant seated on the infant seat technology for the retractor and in the airbag to detect the infant seat Technology can be integrated to reduce the number of parts required to implement each technology, while providing more stable and reliable protection for infants.

In addition, according to the seat belt retractor that can determine whether the infant seat according to the present invention, it is possible to implement not only the integrated technology as described above, but also the block-out function.

1 is an exploded perspective view showing an exploded embodiment of a retractor for a seat belt capable of confirming whether or not an infant seat is installed according to the present invention. FIG. 2 is an enlarged perspective view of a part of a lever, an integrated plate, a reduction gear, and the like in the embodiment illustrated in FIG. 1. 3 is an enlarged plan view of the integrated plate in the exemplary embodiment shown in FIG. 1. 4 is an enlarged bottom view of the integrated plate in the embodiment illustrated in FIG. 1. 5 is an enlarged plan view of the reduction gear in the exemplary embodiment illustrated in FIG. 1. 6 is an exploded perspective view illustrating an enlarged exploded view of the sensing unit in the exemplary embodiment shown in FIG. 1. FIG. 7 is a partial perspective view of the spool and the webbing to explain the operation of the embodiment shown in FIG. 1. 8 and 9 are schematic views showing before the sensing unit operates in the embodiment shown in FIG. 10 and 11 are perspective views showing the operation after the sensing unit is operated in the embodiment shown in FIG. 1. 12 and 13 are schematic diagrams for explaining the configuration and operation of a modification of the sensing unit in the embodiment shown in FIG. 1. 14 and 15 are schematic diagrams for explaining the configuration and operation of another modification of the sensing unit in the embodiment shown in FIG. FIG. 16 is a partial perspective view separately illustrating another modification example of the sensing unit illustrated in FIGS. 14 and 15. 17 is an enlarged perspective view illustrating the lever and the magnet member illustrated in FIG. 16. 18 is a cross-sectional view illustrating a magnet member coupled to a second protrusion of the lever illustrated in FIG. 16. FIG. 19 is a perspective view of a circuit board and a protective device with a Hall sensor shown in FIG. 16, viewed from different directions.

<Explanation of main code>

100: spool 200: frame

300: flywheel gear 400: inclination sensor

500: lever 600: integrated plate

700: reduction gear 800: detection unit

900: electronic control unit

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, descriptions of already known functions or configurations will be omitted to clarify the gist of the present invention.

First, referring to Figures 1 to 6, the configuration of an embodiment of a seat belt retractor that can determine whether or not the seat seat according to the present invention will be described in detail.

1 is an exploded perspective view illustrating an embodiment of a retractor for a seat belt capable of confirming whether an infant seat is installed according to the present invention, and FIG. 2 is a lever, integrated in an embodiment illustrated in FIG. 1. 3 is an enlarged perspective view of a part of a plate, a reduction gear, and the like, FIG. 3 is an enlarged plan view showing an integrated plate in one embodiment shown in FIG. 1, and FIG. 4 is integrated in an embodiment shown in FIG. 1. 5 is an enlarged bottom view of the plate, and FIG. 5 is an enlarged plan view of the reduction gear in the embodiment shown in FIG. 1, and FIG. 6 is an enlarged and disassembled detection unit in the embodiment shown in FIG. It is an exploded perspective view shown.

As shown in Figures 1 to 6, one embodiment of the seat belt retractor that can determine whether the seat seats according to the present invention, the spool 100, the frame 200, flywheel gear 300 , Inclination sensor 400, lever 500, integrated plate 600, reduction gear 700, the sensing unit 800 is configured to include.

Spool 100 is a cylindrical winder in which webbing 110 is wound. In this case, the webbing 110 is wound around the spool 100 by the return spring assembly 120 in the direction in which the webbing 110 is always inserted into the frame 200 to be described later.

The frame 200 receives the webbing 110 therein, and the spool 100 is rotatably coupled to the frame 200. One side outer surface of the frame 200 to which one end of the spool 100 is coupled may be coupled to the return spring assembly 120 described above, and the other outer surface of the frame 200 to which the other end of the spool 100 is coupled. The case 330 surrounding the flywheel gear 300 to be described later may be combined. On the other hand, a guide groove for guiding the webbing 110 may be provided in only one direction may be provided between one outer surface and the other outer surface of the frame 200.

Fly wheel gear (300) is coupled to the other end of the spool 100 to be rotatable with the spool 100, the inclination sensor 400, lever 500, integrated plate 600 will be described later The rotation of the spool 100 and the like are determined together. At this time, whether or not the spool 100 rotates has a correlation with the withdrawal or withdrawal of the webbing 110 as described below.

The flywheel gear 300 is provided with a drive gear 310 coaxial with the rotation axis of the spool 100 in the center, the one-way teeth 320 is formed along the outer circumferential surface.

The driving gear 310 may be coupled to a rotation center axis protruding from the center of the other end of the spool 100. In addition, the driving gear 310 may be directly connected to the driven gear 610 of the integrated plate 600, as described below, or may be indirectly connected through the reduction gear 700. The driving gear 310 serves to transmit the rotation of the spool 100 according to the withdrawal or withdrawal of the webbing 110 to the flywheel gear 300 and the integrated plate 600.

The one-way teeth 320 do not take the inclination sensor 400 or the lever 500 to be described later in the direction in which the webbing 110 is drawn, but the inclination sensor 400 or the following will be described in the direction in which the webbing 110 is drawn out. The lever 500 is formed to be caught.

Meanwhile, the flywheel gear 300 configured as described above may be surrounded by the case 330. This is provided for various purposes, including the purpose of preventing mutual interference with the integrated plate 600 to be described later.

More specifically, the case 330 may include a receiving space 332 for receiving the inclination sensor 400 to be described later. In this case, the cover 334 may be provided to cover the inclination sensor 400 so as not to be separated from the accommodation space 332. Meanwhile, various protrusions 336a, 336b, and 336c to which the lever 500, the integrated plate 600, the reduction gear 700, and the like may be rotatably connected may be provided. In addition, a cover 338 may be provided to cover the lever 500, the integrated plate 600, the reduction gear 700, and the like so that the lever 500, the integration plate 600, and the like may not be detached after being rotatably connected to the case 330.

The inclination sensor 400 serves to prevent the webbing 110 from being pulled out by being caught by the one-way teeth 320 when the frame 200 is inclined at a predetermined angle or more. The inclination sensor 400 may have any structure as long as it can serve as described above. For example, the inclination sensor 400 included in an embodiment of the seat belt retractor according to the present invention is pressed when the inclined portion facing the one-way teeth 320 and the frame 200 is inclined more than a predetermined angle. It may be composed of a spherical weight weight for pressing the part.

The lever 500 serves to implement the automatic locking retractor function by preventing the webbing 110 from being pulled out when the webbing 110 is drawn out by a specific length. That is, when the webbing 110 is drawn out by a predetermined first length (l ₁ , see FIG. 7), the lever 500 is caught by the one-way teeth 320 to allow the webbing 110 to be drawn in, but the webbing ( Withdrawal of 110) is prevented. Then, the lever 500 has a one-way tooth when the webbing 110 drawn out by the first preset length l ₁ (see FIG. 7) is drawn in and pulled out by the second preset length l ₂ (see FIG. 7). Allowing both inlet and withdrawal of webbing 110 away from 320.

In addition, the lever 500 serves to check whether the infant seat is mounted with the implementation of the automatic locking retractor function.

That is, the lever 500 is based on whether the webbing 110 is caught by the one-way teeth 320 while being drawn out by a predetermined first length (l ₁ , see FIG. 7), and the lever 500 is one-way teeth 320. ), It can be confirmed that the infant seat is installed when it is caught and dropped.

The operation of this lever 500 is controlled by the first plate 620 of the integrated plate 600, which will be described later, which rotates with the spool 100 and the flywheel gear 300.

The lever 500 operating as described above may be configured in various ways, but in one embodiment of the retractor for seat belts according to the present invention may be configured by the following method.

First, an example of the lever 500 may include a body 510, a first protrusion 520, a second protrusion 530, and a position fixing part 540.

The body 510 is disposed adjacent to the flywheel gear 300 and the integrated plate 600, and may be rotatably coupled to the case 330 or the frame 200 surrounding the flywheel gear 300. As described below, the body 510 may protrude from the first protrusion 520 and the second protrusion 530, and a position fixing part 540 may be provided.

The first protrusion 520 protrudes from the body 510 and is in contact with the first plate 620. The second protrusion 530 is adjusted by the first plate 620 according to the drawing length of the webbing 110. Serves to engage the one-way teeth 320.

That is, when the webbing 110 drawn out by the predetermined length is drawn in by the return spring assembly 120, the spool 100 on which the webbing 110 is wound is rotated, and the integrated plate cooperating with the spool 100 ( 600). As such, when the integration plate 600 rotates, the first plate 620 constituting the integration plate 600 also rotates to move the first protrusion 520. When the first protrusion 520 is moved, the body 510 is rotated, and the second protrusion 530 protruding from the body 510 is moved, so that the second protrusion 530 is one-way tooth 320. To get caught.

The second protrusion 530 is spaced apart from the first protrusion 520, protrudes from the body 510, and moves as described above, so that the webbing 110 has a predetermined first length l ₁ (see FIG. 7). If it is drawn out, it is caught by the one-way tooth 320.

More specifically, when the webbing 110 is drawn out by a predetermined first length (l ₁ , see FIG. 7), the first protrusion 520 is in contact with the first outer circumferential surface 622 of the first plate 620. The second protrusion 630 is caught by the one-way teeth 320, so that the webbing 110 is no longer able to be pulled out. In addition, when the webbing 110 is retracted after being drawn out by the preset first length l ₁ , see FIG. 7, and drawn out by the second predetermined length l ₂ , see FIG. 7, the first protrusion 520 ) Is in contact with the second outer circumferential surface 624 of the first plate 620 and the second protrusion 530 is separated from the one-way teeth 320, the webbing 110 can be withdrawn again.

The position fixing part 540 has the second protrusion 530 falling from the one-way tooth 320 due to the external force generated when the webbing 110 is retracted after the second protrusion 530 is caught by the one-way tooth 320. Serves to prevent this from happening.

That is, as described above, even though the one-way teeth 320 are formed such that the inclination sensor 400 or the lever 500 is not caught in the direction in which the webbing 110 is drawn in, the one-side teeth 320 have a thread of a certain height due to the characteristics of the teeth. When the webbing 110 is retracted, external force such as impact force or friction force may occur due to contact with the inclination sensor 400 or the lever 500. The external force may be separated from the second protrusion 530 hanging on the one-way teeth 320, the position fixing portion 540 prevents the separation of the second protrusion 530.

The method of configuring the position fixing part 540 may have any configuration as long as it serves as described above. Hereinafter, a case in which the position fixing portion 540 is formed of an elastic unit and a case formed of a clasp will be described as an example.

First, the position fixing part 540 is elastic one side is connected to the case 330 surrounding the frame 200 or flywheel gear 300 and the other side is connected to the first protrusion 520 or the second protrusion 530. It can be formed as a unit. That is, the position fixing part 540 applies an elastic force so that the second protrusion 530 faces the one-way teeth 320, so that the second protrusion 530 due to the external force generated when the webbing 110 is retracted is one direction. Falling from the teeth 320 can be prevented.

As such, when the position fixing part 540 is formed of an elastic member, the lever 500 prevents the first protrusion 520 from being separated from the first plate 620 due to the position fixing part 540. It may further include a third protrusion 550 protruding from the body 510.

In addition, the position fixing unit 540 may be formed of a latch caught on the protrusion 350 provided in the case 330 surrounding the frame 200 or the flywheel gear 300. That is, after the second protrusion 530 is caught by the one-way teeth 320, the position fixing part 540 is caught by the protrusion 350, so that the second protrusion is caused by an external force generated when the webbing 110 is drawn in. The 530 may be prevented from falling from the one-way tooth 320.

On the other hand, irrespective of the case where the position fixing part 540 is formed with the clasp or the elastic unit, the second protrusion 530 is provided in the case 330 surrounding the frame 200 or the flywheel gear 300. A guide 560 may be provided to move toward or away from the one-way teeth 320. As one component constituting the guide part 560, a locking step 562 may be formed so as not to deviate from the movement range of the lever 500.

The integrated plate 600 rotates together with the spool 100 and the flywheel gear 300, and serves to adjust the lever 500 and the inclination sensor 400 according to the drawing length of the webbing 110. That is, the integrated plate 600 is a component that enables one embodiment of the seat belt retractor according to the present invention to implement the automatic locking retractor function and the block out function together.

In particular, since the integrated plate 600 is not an assembly in which separate parts are assembled, but an integrated unit including each component to be described later, friction, noise, etc., of the assembly in implementing the automatic locking retractor function and the block out function are combined. There is no such disadvantage.

The integrated plate 600 may include a driven gear 610, a first plate 620, and a second plate 630.

The driven gear 610 is a gear that cooperates with the drive gear 310 of the flywheel gear 300. That is, the driven gear 610 serves to enable the integrated plate 600 to rotate with the flywheel gear 300 coupled with the spool 100.

The driven gear 610 having such a role may be a gear that can be interlocked with the driving gear 310, and the shape or structure thereof is not limited. As an example, as shown in detail in FIGS. 3 and 4, the driven gear 610 is opposite to the first outer circumferential surface 622 to the fourth outer circumferential surface 634 which will be described later toward the center of rotation of the integrated plate 600. It may be formed of an inner gear provided.

In this case, the reduction gear 700 may be provided between the driving gear 310 and the driven gear 610. The reduction gear 700 serves to reduce the rotational speed of the integrated plate 600 than the rotational speed of the flywheel gear 300 by reducing the rotational ratio of the driven gear 610 relative to the drive gear 310.

The reduction gear 700 having such a role is disposed so that one side is interlocked with the driving gear 310 and the other side is interlocked with the driven gear 610. At this time, in order to reduce the rotation ratio of the driven gear 610 with respect to the drive gear 310, the number of gears on one side of the drive gear 310 is greater than the number of gears on the other side of the driven gear 610.

The first plate 620 serves to adjust the lever 500 according to the drawing length of the webbing 110, and has a first outer circumferential surface 622 and a second outer circumferential surface 624.

The first outer circumferential surface 622 is an outer circumferential surface that contacts the lever 500 when the webbing 110 is retracted after being drawn out by a predetermined first length (l ₁ , see FIG. 7), and the second outer circumferential surface 624 is The webbing 110 is an outer circumferential surface contacting the lever 500 when the webbing 110 is retracted after being drawn out by a predetermined second length (l ₂ , see FIG. 7).

In this case, the first outer circumferential surface 622 and the second outer circumferential surface 624 are formed as circumferential surfaces having different radii, thereby changing the position of the lever 500 while rotating, thereby bringing the lever 500 to the one-way teeth 320. Can be adjusted to jam or fall.

More specifically, the radius of the second outer circumferential surface 624 is greater than the radius of the first outer circumferential surface 622, thereby adjusting the lever 500. That is, when the webbing 110 is drawn out and retracted by a predetermined first length l ₁ (see FIG. 7), the first protrusion 520 of the lever 500 contacts the first outer circumferential surface 622 and the lever ( The second protrusion 530 of the 500 is caught in the one-way teeth 320. However, when the webbing 110 which has been continuously drawn out is drawn out by a predetermined second length (l ₂ , see FIG. 7), the first protrusion of the lever 500 may be formed on the second outer circumferential surface 624 having a larger radius. The body 510 of the lever 500 rotates while pushing the 520. Rotation of the body 510 of the lever 500 moves the second protrusion 530 of the lever 500 so that the second protrusion 530 of the lever 500 is separated from the one-way teeth 320.

The second plate 630 serves to determine whether the inclination sensor 400 operates according to the length of the webbing 110, and is formed as an integral step on the first plate 620. That is, the second plate 630 may be composed of one injection molded product having a stepped shape with the first plate 620. In addition, the width of the second plate 630 may be greater than that of the first plate 620.

The second plate 630 includes a third outer circumferential surface 632 and a fourth outer circumferential surface 634 in contact with the inclination sensor 400.

The third outer circumferential surface 632, when the inclination sensor 400 is operated to prevent the extraction of the webbing 110 when the frame 200 is inclined more than a predetermined angle, the inclination sensor 400 is the second plate ( And an outer circumferential surface in contact with 630. In addition, the fourth outer circumferential surface 634 may be drawn out of the webbing 110 regardless of the angle at which the frame 200 is inclined when the webbing 110 is drawn out by a predetermined third length l ₃ (see FIG. 7). When this is allowed, that is, when the inclination sensor 400 is not operated, it is the outer peripheral surface in contact with the inclination sensor 400.

In this case, the fourth outer circumferential surface 634 is formed to protrude from the third outer circumferential surface 632, and when the webbing 110 is drawn out by a predetermined third length (l ₃ , see FIG. 7), the inclination sensor 400 To the outside of the flywheel gear 300 to prevent the inclination sensor 400 is caught in the one-way teeth 320.

More specifically, the webbing when 110 is more withdrawn than the third length set is a group (l _3, see Fig. 7) group to be drawn until it reaches the third length (l _3, see Fig. 7) is set, the inclination sensor The 400 is in contact with the third outer circumferential surface 632, and may be caught by the one-way teeth 320 when the frame 200 is inclined at a predetermined angle or more. However, when the webbing 110 is drawn out and drawn by a predetermined third length (l ₃ , see FIG. 7), the inclination sensor 400 comes into contact with the fourth outer circumferential surface 634, and the protruding fourth outer circumferential surface 634. ) Pushes the inclination sensor 400 to the outside of the flywheel gear 300, so that the inclination sensor 400 is no longer caught by the one-way teeth 320, webbing regardless of the inclination angle of the frame 200 Allows free entry and withdrawal of 110.

Meanwhile, in addition to the driven gear 610, the first plate 620, and the second plate 630, the integrated plate 600 may further include a reference ruler 640.

The reference ruler 640 corresponds to the reference point 340 provided in the flywheel gear 300 or the case 330 surrounding the flywheel gear 300, when the webbing 110 is completely drawn out of the frame 200. The lever 500 is connected to one side 650 to which the first outer circumferential surface 622 and the second outer circumferential surface 624 are connected when setting the length of the webbing 110 to a predetermined first length (l ₁ , see FIG. 7). It serves to be located.

The reference ruler 640 may be displayed on one surface of the integrated plate 600 in the form of an arrow, or may be a protrusion protruding from the outer circumferential surface of the second plate 630.

The detection unit 800 detects whether or not the infant seat is mounted by detecting whether the lever 500 is adjusted through a sensor unit provided adjacent to the lever 500 when the lever 500 is adjusted by the first plate 620. It is a component to check.

The detection unit 800 checks whether or not the infant seat is mounted in conjunction with the lever 500, and furthermore, if the infant seat is mounted, the airbag may be formed in any structure and shape, and various structures And both forms will be natural to belong to the scope of the present invention.

However, for example, the following description will be made in response to an example of the lever 500 as described above.

That is, whether the sensing unit 800 is pulled out by the predetermined first length (l ₁ , see FIG. 7) while the webbing 110 is caught by the second protrusion 530 of the lever 500 by the one-way teeth 320. On the basis of the reference, when the sensor unit detects that the second protrusion 530 is caught by the one-way teeth 320 and falls, it is confirmed that the infant seat is mounted.

However, after it is confirmed that the infant seat is mounted, the infant seat is mounted even if the second protrusion 530 is not caught by the one-way teeth 320 until the second protrusion 530 is caught by the one-way teeth 320 again. It should be confirmed that

If this is not confirmed, a case may be mistaken that the infant seat is not mounted when the webbing 110 is pulled out by a preset second length (l ₂ , see FIG. 7) after the infant seat is mounted. Because.

However, when the second protrusion 530 is caught by the one-way tooth 320 again, that is, when the webbing 110 is drawn out by a predetermined first length (l ₁ , see FIG. 7), the infant seat is remounted. It will be said that no mistake will occur as described above.

In order to prevent such misunderstandings, there is a method of separately checking an auxiliary unit (not shown) and a method of notifying the user through a display unit (not shown).

On the other hand, there is no limitation on the type of the sensor, of course, in order to easily sense whether the second protrusion 530 is caught in the one-way teeth 320, such as the Hall sensor (840, 840 ') to be described later It is advantageous that the position sensor unit that can detect the relative positional relationship of the two protrusions (530).

In more detail, in order to describe the sensing unit 800, referring to FIGS. 8 to 15, examples and various modifications of the sensing unit 800 will be described as follows.

8 and 9 are schematic views showing before the sensing unit is operated in the embodiment shown in FIG. 1, and FIGS. 10 and 11 are the sensing unit operated in the embodiment shown in FIG. 1. 12 and 13 are schematic views illustrating the configuration and operation of a modification of the sensing unit in the exemplary embodiment illustrated in FIG. 1, and FIGS. 14 and 15 are illustrated in FIG. It is a schematic diagram shown in order to demonstrate the structure and operation of another modified example of a sensing unit in one Embodiment shown in FIG.

As shown in FIGS. 8 to 11, the sensing unit 800 includes a circuit board 830 to which the Hall sensor 840 is attached, a housing 810 on which one surface of the circuit board 830 is mounted, and a lever. It may be configured to include a magnet member 820 provided to face the second protrusion 530 of the 500 to enter the housing 810 when the second protrusion 530 is caught by the one-way teeth 320 and falls. .

When the sensing unit 800 is configured as described above, as shown in FIGS. 8 and 9, when the second protrusion 530 of the lever 500 is caught in the one-way teeth 320, the second protrusion 530. Since the magnet member 820 is not pushing the magnet member 820 into the housing 810, the magnet member 820 and the hall sensor 840 are not adjacent to each other, thereby causing the current flowing through the hall sensor 840 to be reduced. The intensity is unchanged. Accordingly, the circuit board 830 does not recognize the fact that the intensity of the current flowing in the hall sensor 840 is changed, so it is confirmed that the infant seat is not mounted yet.

On the other hand, as shown in FIGS. 10 and 11, when the second protrusion 530 of the lever 500 is hung on the one-way teeth 320 and is separated, the second protrusion 530 is the magnet member 820. ) Is pushed into the housing 810, the magnet member 820 and the Hall sensor 840 is adjacent, thereby changing the intensity of the current flowing through the Hall sensor 840. Therefore, the circuit board 830 is also aware of the fact that the intensity of the current flowing through the Hall sensor 840 is confirmed that the infant seat is mounted.

As such, an example of the sensing unit 800 that is operated as shown in FIGS. 8 to 11 may further include an elastic member 850.

In this case, the elastic member 850 adjusts the position of the magnet member 820 with respect to the housing 810 before the second protrusion 530 falls on the one-way teeth 320, and the second protrusion 530 is one direction. After falling to the teeth 320, the second protrusion 530 serves to reposition the magnet member 820 into the housing 810 when the second protrusion 530 is caught by the one-way teeth 320 again.

If the elastic member 850 can perform the role as described above, it may be changed to a design other than the coil spring as shown in the figure.

Meanwhile, the modification of the sensing unit 800 that is operated as shown in FIGS. 12 and 13 may further include an induction protrusion 860 for assisting the operation of the sensing unit 800.

In this case, the guide protrusion 860 is to assist the magnet member 820 to enter the housing 810 when the second protrusion 530 of the lever 500 falls on the one-way teeth 320, and the second protrusion 860. A component protruding from one surface of the magnet member 820 against the 530.

That is, when the second protrusion 530 of the lever 500 and the second protrusion 530 of the structure of the magnet member 820 are difficult to push the magnet member 820 into the housing 810, FIG. 12 and FIG. As shown in FIG. 13, the induction protrusion 860 may be provided in the magnet member 820 so that the second protrusion 530 may easily push the magnet member 820 into the housing 810.

If the guide protrusion 860 may also play a role as described above, the guide protrusion 860 may not be shaped as shown in the drawings and may be changed into another shape.

Meanwhile, another modification of the sensing unit 800 that is operated as shown in FIGS. 14 and 15 is a design change to omit the housing 810 and the elastic member 850, and the hall sensor 840 ' ) Is attached to the case cover 338 adjacent to the case cover 338, and the magnet member 820 'interlocked with the hall sensor 840' may be configured to be mounted on the second protrusion 530. have.

In order to describe another modified example of the sensing unit 800 in more detail, the following description will be made with reference to FIGS. 16 to 19.

At this time, Figure 16 is a partial perspective view showing a part of the separation of the other modified example of the sensing unit shown in Figure 14 and 15, Figure 17 is an enlarged perspective view of the lever and the magnet member shown in Figure 16, FIG. 18 is a cross-sectional view illustrating a form in which a magnet member is coupled to a second protrusion of the lever illustrated in FIG. 16, and FIG. 19 is a side view of the circuit board and the protective device to which the hall sensor illustrated in FIG. 16 is attached from different directions. One perspective view.

As shown in FIGS. 16 to 19, the magnet member 820 ′ is mounted on the second protrusion 530, and is not mounted by simple adhesive, but in order to prevent incorrect mounting of the manufacturer in consideration of polarity. Can be mounted together.

That is, the magnet member 820 ′ has a polarity opposite to the polarity of the first portion 820 ′ a and the first portion 820 ′ a having a polarity (S pole) in response to the hall sensor 840 ′. N pole) having a second portion 820'b, so that the second portion 820'b is opposed to the Hall sensor 840 'so that no misfit occurs. It is advantageous to form the second portion 820 ′ b to have different shapes. That is, by forming the first portion 820 ′ a and the second portion 820 ′ asymmetrically, the magnet member 820 ′ may be prevented from being incorrectly mounted on the second protrusion 530.

As described above, in order to form the first portion 820 ′ a and the second portion 820 ′ asymmetrically, ferrite is impossible using a conventional ferrite processing method, that is, a cutting method. And PA6 mixing).

On the other hand, since the circuit board 830 'with the Hall sensor 840' is weak in durability, it is advantageous to be fitted to the circuit board protector 870 when provided adjacent to the case cover 338, in which case the circuit board Naturally, the shape of the protective device 870 does not affect the scope of rights at all.

When the sensing unit 800 is configured as described above, as shown in FIG. 14, the second protrusion 530 of the lever 500 is provided in the second protrusion 530 when the second protrusion 530 is caught by the one-way teeth 320. Since the magnet member 820 ′ is not adjacent to the hall sensor 840 ′, no current flows in the hall sensor 840 ′, and thus the infant seat is not mounted because no current is received in the circuit board 830 ′. It is confirmed that it is not.

On the other hand, as shown in FIG. 15, if the second protrusion 530 of the lever 500 is caught by the one-way teeth 320 and then falls off, the magnet member 820 ′ provided in the second protrusion 530 may be a hole. Since it is adjacent to the sensor 840 ', a current flows in the hall sensor 840', and thus, there is a current received in the circuit board 830 ', thereby confirming that the infant seat is mounted.

Examples and various modifications of the sensing unit 800 as described above are connected to an electronic control unit (ECU) 900 that determines whether or not to operate the airbag by checking whether the infant seat is mounted.

In this case, the connection with the electronic control unit 900 may be the circuit boards 830 and 830 'if the sensing unit 800 is provided as described above, as well as interworking with the circuit boards 830 and 830'. It may be a circuit board linkage 880.

In addition, the electronic control unit 900 may be provided in the airbag module, but may be provided in an integrated module that interlocks with other safety devices in the vehicle and may be configured to control the airbag module by CAN communication. Naturally, the scope of the present invention is not limited due to the design change of the electronic control unit 900.

Next, referring to FIG. 7 and FIGS. 8 to 13, the operation process and the effect of an embodiment of the seat belt retractor capable of confirming whether the infant seat is mounted according to the present invention will be described in detail.

FIG. 7 is a partial perspective view illustrating the spool and the webbing to explain the operation of the embodiment illustrated in FIG. 1.

First, referring to FIG. 7, an embodiment of a retractor for a seat belt capable of confirming whether or not an infant seat is installed according to the present invention will be described as to what function the webbing 110 implements according to the length of the pulled out.

The webbing 110 is wound on the spool 100 so that the webbing 110 is always drawn by the return spring assembly 120, but the webbing 110 is drawn out to a predetermined length according to a user's needs as follows.

However, when the webbing 110 is drawn out by a predetermined first length l ₁ , the first protrusion 520 of the lever 500 may have a first outer circumferential surface (1) of the first plate 620 of the integrated plate 600. 622, the second protrusion 530 of the lever 500 is caught by the one-way teeth 320 of the flywheel gear 300. Therefore, when the webbing 110 is drawn out by a predetermined first length l ₁ , the webbing 110 is no longer drawn out but only drawn out.

The withdrawal prevention and withdrawal allowance of the webbing 110 is to implement the automatic locking retractor function of the embodiment of the retractor for seat belts according to the present invention, the webbing 110 by a predetermined first length (l ₁ ) Withdrawal may be the point at which the automatic locking retractor function is implemented.

That is, the view point may be when the lever 500 is at one side 650 of the first plate 620 to which the first outer circumferential surface 622 and the second outer circumferential surface 624 are connected, and the webbing 110 may be It is drawn out by a predetermined first length l ₁ .

On the other hand, the viewpoint can be adjusted as desired by the user, but may be when the webbing 110 is completely drawn from the frame 200 for ease of viewpoint setting. That is, the predetermined first length l _{1 of the} webbing 110 may be a length when the webbing 110 is completely drawn out of the frame 200 as illustrated in FIG. 7.

Subsequently, when the webbing 110 is continuously drawn in and drawn out by a predetermined second length l ₂ , the first protrusion 520 of the lever 500 is formed by the first plate 620 of the integration plate 600. The outer circumferential surface 624 is in contact, and the second protrusion 530 of the lever 500 is displaced from the one-way teeth 320 of the flywheel gear 300. Therefore, when the webbing 110 is drawn out by a predetermined second length l ₂ , the webbing 110 is free to be pulled out and pulled out.

Allowing free drawing and withdrawal of the webbing 110 is to release the automatic locking retractor function of the embodiment of the retractor for seat belts according to the present invention, and the webbing 110 is set to a predetermined second length l ₂ . As long as withdrawal can be the end point to implement the automatic locking retractor function.

That is, the end point may be when the lever 500 is at the other side 660 of the first plate 620 to which the first outer circumferential surface 622 and the second outer circumferential surface 624 are connected, and the webbing 110 may be It is drawn out by a predetermined second length l ₂ .

Meanwhile, the drawing of the webbing 110 by the second predetermined length l ₂ may be used as an end point for implementing the automatic locking retractor function and at the same time as a switch for checking whether the infant seat is mounted. Can be.

That is, if the webbing 110 is in the first preset length l ₁ and the second preset length l ₂ , the webbing 110 is in a section for implementing the automatic locking retractor function. If the webbing 110 is less than or equal to the preset second length l ₂ , it will be said that it is not in the section for implementing the automatic locking retractor function, which means that there is no intention of mounting the infant seat.

Therefore, the infant seat is based on whether the webbing 110 is drawn out to the predetermined second length l ₂ or more, that is, whether the lever 500 is caught by the one-way teeth 320 and then falls. You can check whether it is installed.

At this time, in order to check whether the lever 500 is caught by the one-way teeth 320 and falls, it will be said that the sensing unit 800 is included in one embodiment of the present invention. As already discussed, the description thereof will be omitted.

As described above, according to an embodiment of the seat belt retractor that can determine whether the infant seat mounting according to the present invention, by checking the operation of the automatic locking retractor will be able to determine whether the infant seat mounting, If the infant seat is installed on the basis, it will be possible to protect the infant more stably by not operating the airbag.

On the other hand, regardless of the predetermined first length l ₁ and the second length l _{2 of the} webbing 110, when the webbing 110 is drawn out and drawn by the predetermined third length l ₃ , the slope is inclined. The pressing portion of the sensor 400 is in contact with the fourth outer circumferential surface 634 of the second plate 620 of the integrated plate 600, the pressing portion of the inclination sensor 400 one-way teeth 320 of the flywheel gear 300 To get away from it. Therefore, when the webbing 110 is drawn out and drawn by a predetermined third length l ₃ , the inclination sensor 400 does not work regardless of the inclination angle of the frame 200, so that the webbing 110 is drawn out and drawn in. This is free.

On the contrary, if the webbing 110 is drawn out more than the predetermined third length l ₃ , the pressing portion of the inclination sensor 400 is the third outer circumferential surface of the second plate 620 of the integrated plate 600. In contact with 632, it is determined whether the pressing portion of the inclination sensor 400 is caught by the one-way teeth 320 of the flywheel gear 300 according to the angle at which the frame 200 is inclined.

The withdrawal prevention and withdrawal allowance of the webbing 110 is to implement the block out function of the embodiment of the retractor for seat belts according to the present invention, which allows the webbing 110 to withdraw by a predetermined third length l ₃ . It can be a reference point for implementing the block out function.

At this time, the reference point for implementing the block out function is irrelevant to the start and end points of the above-described automatic locking retractor function. Thus, unlike shown in FIG. 6, the third predetermined length l ₃ of the webbing 110 may be longer than the second predetermined length l ₂ .

That is, in one embodiment of the seat belt retractor that can determine whether the seat seat infant according to the present invention can determine whether or not the seating infant seat by checking the operation of the automatic locking retractor, as well as separate block out function It can be implemented integrally without implementing parts of.

While specific embodiments of the invention have been described and illustrated above, it is to be understood that the invention is not limited to the described embodiments, and that various modifications and changes can be made without departing from the spirit and scope of the invention. It is self-evident to those who have. Therefore, such modifications or variations should not be understood individually from the technical spirit or point of view of the present invention, the modified embodiments will belong to the claims of the present invention.

Claims (15)

1. Spools with webbing wound;

   A frame to which the spool is rotatably coupled and to receive a webbing wound around the spool;

   A flywheel gear having a drive shaft coaxial with a rotation shaft of the spool at a central portion thereof, and having a one-way tooth formed along an outer circumferential surface thereof and mounted at one end of the spool to rotate together with the spool;

   When the webbing is drawn out by a predetermined first length, the webbing is caught by the one-way teeth to allow the webbing to be pulled out, and the extraction is prevented, and after the webbing is drawn out by the preset first length, the second webbing is drawn back into the preset second. A lever for allowing both the drawing and withdrawal of the webbing away from the one-way tooth when drawn out by a length;

   An integrated plate having a driven gear interlocked with a drive gear of the flywheel gear to rotate with the spool and the flywheel gear, the integrated plate having a first plate for adjusting the lever according to the drawing length of the webbing; And

   When the lever is adjusted by the first plate, the sensing unit for detecting whether the infant seat is mounted by detecting whether the lever is adjusted by the sensor unit provided adjacent to the lever; including, infant seat Retractor for seat belts that can be installed.
2. The method of claim 1,

   The first plate may include a first outer circumferential surface contacting the lever when the webbing is retracted after a predetermined first length, and when the webbing is retracted after a webbing is drawn for a second predetermined length. And a second outer circumferential surface in contact with the lever, wherein the first outer circumferential surface and the second outer circumferential surface are formed as circumferential surfaces having different radii, thereby engaging or dropping the lever to the one-way teeth by changing the position of the lever while rotating. Retractor for seat belts that can determine whether or not the infant seat is mounted, characterized in that the adjustment so that.
3. The method of claim 2,

   When the frame is inclined more than a predetermined angle is further included an inclination sensor to catch the one-way teeth to prevent the extraction of the webbing, the integrated plate is formed as an integral step on the first plate to operate the inclination sensor Retractor for seat belts that can determine whether or not the infant seat mounting, characterized in that it further comprises a second plate for determining whether or not.
4. The method of claim 3,

   The second plate includes a third outer circumferential surface and a fourth outer circumferential surface in contact with the inclination sensor, wherein the third outer circumferential surface prevents the webbing from being pulled out when the frame is inclined by a predetermined angle or more. The fourth outer circumferential surface to allow the webbing to be pulled out irrespective of the inclination angle when the webbing is drawn out and drawn in by the third predetermined length. Retractor for seat belts that can determine whether or not the infant seat mounting, characterized in that the sensor is prevented from being caught in the one-way teeth.
5. The method of claim 4, wherein

   The lever includes a body disposed adjacent to the flywheel gear and the integrated plate; A first protrusion protruding from the body and in contact with the first plate; A second protrusion that is spaced apart from the first protrusion and protrudes from the body and is caught by the one-way teeth when the webbing is drawn out by a predetermined first length; And a position fixing part for preventing the second protrusion from falling from the one-way tooth due to an external force generated when the webbing is retracted after the second protrusion is caught in the one-way tooth. Retractors for seat belts that can be checked.
6. The method of claim 5,

   When the webbing is drawn out by a predetermined first length, the first protrusion is in contact with the first outer circumferential surface of the first plate and the second protrusion is caught by the one-way teeth so that the webbing is no longer able to be pulled out. And when the webbing is retracted by a preset first length and then retracted by a preset second length, the first protrusion contacts the second outer circumferential surface of the first plate and the second protrusion is in one direction. A retractor for seat belts that can be checked whether or not an infant seat is mounted, wherein the webbing is retractable from the teeth.
7. The method of claim 5, wherein the sensing unit, based on whether the second protrusion is caught in the one-way teeth while the webbing is drawn by a predetermined first length, the second protrusion is caught in the one-way teeth When the child seat is separated, it is confirmed that the infant seat is mounted, but after the second child is caught in the one-way tooth again after it is confirmed that the infant seat is mounted, the second protrusion may be separated from the one-way tooth. Retractor for seat belts that can determine whether the infant seat is mounted, characterized in that the infant seat is confirmed that is mounted.
8. The method of claim 7, wherein

   The detection unit, characterized in that it comprises a position sensor for detecting the relative position of the second protrusion, so that the second protrusion is caught on the one-way teeth or separated. Retractors for seat belts that can be checked.
9. The method of claim 8,

   The position sensor unit includes a circuit board to which a hall sensor is attached, a housing in which the circuit board is mounted on one surface, and is provided to face the second protrusion, and when the second protrusion is caught by the one-way teeth and falls, Including a magnet member that enters, the magnet member is entered into the housing, the magnetic member and the Hall sensor is adjacent to the intensity of the current flowing through the Hall sensor is changed, the strength of the current flowing through the Hall sensor Determining whether the second projection is caught by the one-way teeth or away from the circuit board by determining whether the circuit board is changed.
10. The method of claim 9,

    The sensing unit is configured to adjust the position of the magnet member relative to the housing before the second protrusion falls from the one-way teeth, and the magnet member that enters inside the housing when the second protrusion is caught by the one-way teeth again. Retractor for seat belts that can be confirmed whether the seat is mounted, characterized in that it further comprises an elastic member to the original position.
11. The method of claim 9,

    The sensing unit further includes an induction protrusion protruding from one surface of the magnet member facing the second protrusion so as to assist the magnet member entering the housing when the second protrusion falls from the one-way tooth. Retractor for seat belts, characterized in that the infant seat can be installed or not.
12. The method of claim 8,

    The position sensor unit may include a circuit board to which a hall sensor is attached and a magnet member mounted to the second protrusion. When the second protrusion is caught by the one-way teeth and falls, the magnet member and the hall sensor may be separated. By determining through the circuit board whether the strength of the current flowing through the Hall sensor is changed while being adjacent, the strength of the current flowing through the Hall sensor is changed. Retractor for seat belts that can determine whether the seat, characterized in that the infant seat.
13. The method of claim 12,

    The magnet member includes a first portion having a polarity responsive to the hall sensor and a second portion having a polarity opposite to the polarity of the first portion, wherein the second portion faces the hall sensor. Retractors for seat belts that can determine whether or not the infant seat mounting, characterized in that the first portion and the second portion are formed in an asymmetrical shape with each other so as to prevent being mounted to the protrusion.
14. The method of claim 13,

    The magnet member is characterized in that the first portion and the second portion is formed through injection, so that the second portion can be formed in an asymmetrical form, retractor for seat belts that can determine whether or not the infant seat.
15. The method according to any one of claims 7 to 14,

    The sensing unit is connected to an electronic control unit (ECU) for determining whether to operate the airbag by checking whether or not the infant seat, Retractor for seat belts that can determine whether the infant seat.

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