JP2010105577A - Seat belt attachment auxiliary device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily attach a seat belt by easily taking a tongue of the seat belt when an occupant sits on a rear seat or the like and attaches the seat belt. <P>SOLUTION: The seat belt attachment auxiliary device includes: a projection arm drive part 30 capable of projecting the seat belt 8 usually stored in a part of a seat back 3 and laid along the seat back 3 toward a front side by turning of a projection arm 33; a drive transmission part 40 in which a wire 45 connected to the projection arm 33 and a coil spring 41 are arranged in series; a drive source 50 having a motor 51 attaining turning of the projection arm 33 by rolling-up or drawing out a wire 35 connected to the coil spring 41; a detection sensor 22 for detecting the sitting state of the occupant. The projection arm 33 is operated by wire rolling-up action of the motor 51 by detecting the sitting occupant by the detection sensor 22, and the seat belt 8 is forwardly projected to a side position of the occupant to assist attachment of the seat belt of the occupant. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seat belt wearing assistance device, and in particular, when a passenger sits on a bench seat in the rear seat and wears the seat belt, the tongue position of the seat belt is moved forward from the seat back surface by a simple drive mechanism. It is related with the seatbelt mounting | wearing auxiliary | assistance apparatus which moved to (2) so that mounting | wearing of the buckle was made easy.

  In a normal seat belt device, when the occupant sits on the seat and wears the seat belt, the passenger grasps the tongue inserted through the seat belt, inserts it into the tongue insertion port of the buckle device located beside the seat, and buckles the tongue. The seat belt waist belt and shoulder belt properly restrain the occupant in a state of being fixed on the apparatus. At that time, the occupant of the front seat seats the tongs held at a predetermined position of the seat belt which is stretched substantially vertically along the center pillar located beside the seat back so as to twist the body. The tongue is mounted on the buckle device located inside the seat. As a mechanism for assisting the passenger in wearing the seat belt, the invention described in Patent Document 1 has been proposed. The invention disclosed in Patent Document 1 mainly includes a seat belt system 40 having a bracket 30 provided on a side surface of a seat back so as to be rotatable about a lower end rotation shaft in a front passenger seat. . The seat belt system 40 includes a belt 41, a tongue plate 42 through which the belt 41 is inserted, a winding device 43 that can wind up one end portion in the longitudinal direction of the belt 41, and the other end portion in the longitudinal direction of the belt 41. An anchor member 44 and a buckle 45 to which the tongue plate 42 can be attached and detached. Of these, the winding device 43 is accommodated in the bracket 30. The seated occupant picks up the tongue plate 42 located at the tip of the bracket 30 that has fallen forward so as to function as an armrest, pulls out the belt 41 from the take-up device 43 in the bracket 30, and moves it to the opposite side of the seat. A tongue plate 42 is attached to the buckle 45 positioned. The storage position of the bracket 30 is secured by a torsion spring (elastic member) 48 incorporated in the shaft portion, and the bracket is rotated from the storage position to the use position (horizontal position) by the operation of the electric motor 50 installed in the seat back. In the meantime, the tongue plate 42 is projected from the tip of the bracket 30 by the operation of the slide guide 53, so that the occupant can easily take the tongue plate 42.

There has also been proposed a seat belt presenter device in which a belt hanger is inserted at the tip of a rod of a telescopic mechanism that can be expanded and contracted separately from a seat (Patent Document 2). In this seat belt presenter device, by operating the driving device provided at the rod base, the rod of the telescopic mechanism is extended, the belt hanger is positioned at the side of the seat where the occupant is seated, and the seat belt is handled. Can be easily performed.
JP 2006-117008 A Japanese Utility Model Publication No. 61-176047

  By the way, the seatbelt mounting assist device disclosed in Patent Document 1 swings the bracket forward by a motor-driven wire operation on the premise that a bracket is provided on the side surface of the seatback like a front seat. The tongue plate is projected from the tip of the bracket by the slide mechanism, thereby facilitating the pulling out of the seat belt from the winding device built in the bracket and the buckle mounting of the tongue plate. Therefore, an independent type seat structure is assumed. Since the rear seat generally has a bench seat structure, some seat belt retractors are installed behind the seat. In such a type of seat belt device, a bracket as disclosed in Patent Document 1 is used. A seatbelt wearing assist device of the type used by tilting forward cannot be applied.

  In addition, in the seat belt wearing assistance device disclosed in Patent Literature 1 and Patent Literature 2, swinging of the bracket arm incorporating the winding device and rod expansion / contraction of the telescopic mechanism are realized by forward / reverse rotation operation of the motor. . It is necessary to use a motor with a relatively large output for swinging the bracket and extending / contracting the rod, and the drive system becomes larger and heavier as an auxiliary device for the seat belt device.

  Further, in the invention disclosed in Patent Document 1, it is not assumed that the rotation operation is blocked by a part of the occupant's body when the bracket is rotated forward. In other words, the position of the bracket is set to detect that the bracket has moved to the horizontal position and stop energizing the motor. Therefore, there is a possibility that the motor is not energized and the motor load is generated. Also in Patent Document 2, even when there is an obstacle in the extending direction of the rod, an overload to the drive device is similarly generated. Even if an overload prevention device is provided, when the motor stops, the bracket and rod stop during rotation and extension, and it is necessary to set a control circuit that performs each return operation and re-operation. There is.

  Accordingly, an object of the present invention is to solve the above-described problems, and in a seat belt device equipped with a seat belt along a seat back like a rear seat, a part of a seated occupant's body rotates an arm. Even if it becomes an obstacle, the seat belt can be easily attached without the load being applied to the motor drive, with the seat belt extended forward using the biasing force of the motor and spring as the drive source It is to provide a mounting assistance device.

  In order to achieve the above object, the present invention provides a seat belt which is housed in a part of a seat back and is stretched along the seat back in front of the seat back surface according to the rotation of the overhanging arm. An overhanging arm driving unit that can be extended and held toward the wire, a wire connected to the overhanging arm driving unit, a drive transmission unit in which an elastic member is interposed in series in the path of the wire, and the drive transmission unit Winding or pulling out the wire connected to the arm drive unit to operate the drive unit, a drive source capable of applying a predetermined urging force to the elastic member, and a detection unit for detecting the seating state of the occupant, Detecting the occupant seated in the detection unit, the arm drive unit is operated by the wire rod winding operation of the drive source, and a part of the seat belt is projected to a side position of the occupant to Characterized in that to assist Toberuto mounting. Thus, the seat belt extending mechanism can be operated with a simple configuration, and the occupant can easily attach the seat belt in this state.

  The overhang arm drive unit is housed in a notch formed in the seat back, and is always housed in the notch by the biasing force of a torsion coil spring, and the drive unit is configured to move the elastic member of the drive transmission unit. It is preferable to extend the portion of the seat belt by extending the extension arm forward against the urging force of the torsion coil spring by extending the wire rod while extending the wire rod. As a result, the overhanging arm is accommodated in a normally urged state in the seat back, so that it does not interfere with the occupant's up and down movement, and only operates when the operation of extending the seat belt is necessary. Can be made.

  The spring biasing force applied by the extension of the elastic member of the drive transmission unit allows the extension arm to protrude forward against the biasing force of the torsion coil spring even after the drive source is stopped. Even when the obstacle prevents the extension arm from rotating, the arm can be extended without driving the motor as the drive source, and the power consumption can be suppressed.

  When the drive source is an electric motor with a speed reducer having a member that winds the wire extending from the drive transmission portion, efficient winding and drawing of the wire can be realized by a small motor.

  By using a tension coil spring as the elastic member of the drive transmission unit, a simple structure can be realized, and by using a mainspring spring, the drive transmission unit can be downsized.

  The projecting arm has a bent shape that avoids interference with the indoor-side protruding member of the door, thereby preventing the arm from coming into contact with the door interior or the seated occupant from coming into contact with the arm. .

  A cover sheet is provided between the overhanging arm and the seat back, and the cover sheet is unfolded in a fan shape between the arm and the seat back surface as the overhanging arm rotates forward. Is preferred. Accordingly, it is possible to reliably prevent the movement of the arm from being blocked due to a part of the occupant's body being sandwiched between the arm and the seat back.

  The overhang arm drive unit is composed of a rotating member that replaces a part of the cushion in the seat back, and the skin surface rotates from an initial state that is flush with the skin of the seat back. It is preferable to project the seat belt forward on the skin surface. Thereby, a member with good appearance can be provided in terms of a design having both an arm function and a cover sheet function.

  As described above, according to the present invention, in the rear seat, when the occupant is seated, the seat belt disposed along the seat back is moved forward by the overhang mechanism that operates when the occupant is seated. By overhanging, it is possible to realize a state in which the occupant can easily put the seat belt on the hand. Further, when the operation of the overhang mechanism is blocked by an obstacle or the like, the motor as a drive source can be stopped to prevent an overload from occurring, and when the obstacle is removed, the motor is Since the operation of the overhang mechanism can be performed without re-driving, the power consumption of the motor can be suppressed.

Hereinafter, the configuration of the seat belt wearing assistance device according to the embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a seat belt used by a passenger seated in a left seat, and a seat portion 2 and a seat back 3 of the left seat, a part of a rear shelf 7 between the rear seat and the rear window 4, and a rear seat bench. An initial state of the device 1 (a state in which no occupant is seated) is shown. In the seat belt device 1, as shown in the figure, the retractor 6 is fixed on a frame (not shown) below the rear shelf 7, and the seat belt 8 pulled out from the retractor 6 is seated along the seat back 3. The seat belt is pulled out to the lower end of the back 3, and the end of the seat belt is located in the back portion between the lower end of the seat back 3 and the seat portion 2, and is fixed to an anchor portion (not shown) fixed to the seat frame surface. . A tongue 9 is inserted through the seat belt 8 and is disposed at a height that can be easily taken by a passenger by a snap member (not shown) provided on the seat belt 8. Furthermore, in the same figure, the overall configuration of the seatbelt wearing assist device 10 is also shown. The seat belt wearing assist device 10 includes an overhang arm mechanism 30 housed in the seat back 3 below the intermediate position of the seat belt 8, and a drive transmission for operating the overhang arm mechanism 30 by winding and pulling out the wire. The main part is a part 40, a drive source 50 for winding and pulling out the wire, and a control part for controlling the drive source 50. The rear side of the drive transmission part 40 is in a rear trunk (not shown). They are arranged in series.

  FIG. 2 shows an overhanging state of the seat belt 8 of the seat belt wearing assistance device 10 of the left seat 2 in a state where a passenger (not shown) is seated. In the left side seat, the seat belt 3 is hanged in the vertical direction of the seat back 3 by a part of the overhanging arm 33 protruding forward from the surface of the seat back 3 by the operation of the seat belt wearing assist device 10 (see FIG. 1). The seat belt 8 protrudes forward so as to be bent at an intermediate position, and a tongue 9 is positioned on the upper side near the bent tip of the seat belt 8. For this reason, the passenger (not shown) is seated and holds the tongue 9 in the vicinity of the bent position of the seat belt 8 protruding forward on the left side. The tongue 9 can be easily attached to the buckle 21 on the right side of the seated position.

Hereinafter, the configuration of the seat belt wearing assistance device 10 and a part of the seat belt 8 wound around the surface of the seat back 3 and wound around the surface of the seat back 3 are stretched by a predetermined amount when seated on the occupant. The operation of each part to be output will be described.
[Configuration of seat belt auxiliary equipment]

  A schematic configuration of an embodiment of the seat belt wearing assistance device will be described with reference to FIGS. The seat belt wearing assist device 10 includes a protruding arm mechanism 30 that realizes a series of operations up to a state where the wearing of the seat belt illustrated in FIGS. 1 to 2 is facilitated, and swinging of the protruding arm 33 of the protruding arm mechanism 30. A tension coil spring (hereinafter referred to as a coil spring) 41 serving as a drive transmission unit 40 that realizes (reciprocating rotation operation) and a DC motor 51 as a drive source 50 including a speed reducer 52 are configured. FIG. 3 shows each of the overhang arm mechanism 30, the drive transmission unit 40, the drive source 50, and the seating detection sensors 22 as detection units arranged at a plurality of locations in order to detect the relationship and each state. FIG. 2 is a configuration diagram schematically showing a configuration including a seat belt wearing detection sensor 23 and an ECU as a control unit 26, and operation explanatory diagrams of corresponding operation portions.

  The overhanging arm mechanism 30 shown in the configuration diagram of FIG. 3A is in a notch formed from the surface of the seat back 3 as shown in FIG. 1 when not seated (occupant is not seated). The whole is housed. The extension arm mechanism 30 is supported by a substantially U-shaped support frame 31 fixed on a frame (not shown) that supports the seat 2 as shown in FIGS. 1 to 3C. And a belt arm 34 attached to the upper end of the projecting arm 33. The projecting arm 33 has an inverted L shape such that the rotating shaft 32 is positioned at the lower end. A wire fixing end 33 a described later is formed on the front surface side of the overhang arm 33. An end of an arm drive wire 35 (hereinafter simply referred to as a wire 35) connected to the drive transmission unit 40 is fixed to the wire fixing end 33a. A coil spring holding shaft 36 and a deflection pulley 38 are coaxially formed on the rotating shaft 32, and a coil portion 37 a of a torsion coil spring 37 is held on the coil spring holding shaft 36. The torsion coil spring 37 is formed of a spring having a predetermined torsion spring coefficient in the coil portion 37a and extended from both ends of the coil portion 37a as shown in FIGS. One end of the linear portion is fixed to the side flange of the support frame 31, and the other end is inserted and fixed in a fixing hole formed at a predetermined position of the projecting arm 33. Due to the action of the initial urging force of the torsion coil spring 37 (clockwise direction in FIG. 3A), as shown in FIGS. It is in a state of being accommodated in the notch of the back 3. The wire fixing end 33 a formed on the front surface side of the overhanging arm 33 is connected to the wire 45 from the motor 51 of the driving source 50 and the wire 35 connected via the coil spring 41 on the path coaxially with the rotating shaft 32. It is stretched over the arranged deflection pulley 38 and wired. Therefore, as shown in FIGS. 2 and 3B, when the occupant is seated, the wire 35 is drawn by a predetermined amount by the forward rotation of the motor 51, and the wire fixing end 33a is rotated via the deflection pulley 38. Thus, the overhang arm 33 is rotated by a predetermined angle about the rotation shaft 32, and the upper half portion of the overhang arm 33 and the belt holder 34 project from the seat back 3 toward the front of the seat.

  FIG. 3A also shows a drive transmission unit 40 constituted by a part of the wire 35 extended from the overhang arm mechanism 30. The drive transmission unit 40 has a simple configuration in which a tension coil spring 41 functioning as a backup spring is wired so that it can expand and contract linearly in its axial direction. As shown in FIGS. 1 to 2, the coil spring 41 as the drive transmission unit 40 is wired in a rear trunk (not shown), and a wire 45 connected to the other end fixing end of the drive source 50 described later. When a predetermined amount is taken up by a take-up pulley (not shown) in the speed reducer 52, it expands according to the tension and accumulates an urging force.

  In the present invention, the drive source 50 is installed in a rear trunk located behind the seat on which the seatbelt mounting auxiliary device 1 is installed, and a DC motor 51 that can rotate forward and backward by an operation signal from the control unit 26. , And a speed reducer 52. The reduction gear 52 decelerates the motor output to such an extent that the wire can be wound and pulled out, and the wire 45 is wound around a winding pulley (not shown) on the gear train. As shown in FIGS. 1 and 3A, the end of the wire 45 extending from one end of the coil spring 41 of the drive transmission unit 40 is fixed to a take-up pulley (not shown) in the speed reducer. By switching between forward / reverse rotation and adjusting the amount of rotation, the amount of winding and drawing of the wire 45 can be set as appropriate.

  As shown in FIGS. 2 and 3 (b), the winding amount of the wire by the motor 51 is arranged at an intermediate position between the winding of the wire 35 and the winding of the protruding arm 33 forward together with the seat belt 8. A length corresponding to a predetermined amount of elongation (acting as an urging force when released) is set to the coil spring 41, and the coil spring 41 is wound in the speed reducer 52 by the rotation of the motor 51.

  As another configuration for operating the seat belt wearing assistance device 10 of the present invention, as shown in FIG. 3A, the seat detection sensor 22 embedded in the seat surface of the seat is housed in the buckle 21, as shown in FIG. The seat belt wearing detection sensor 23 for detecting the proper wearing of the tongue 9, the door opening / closing detection sensor 24 for detecting the opening / closing state of the door, and the operation information of the occupant from each of these sensors are collected In response to this, a control unit 26 is provided for setting an appropriate position of the seat belt extending member 10 by issuing a motor operation command signal.

  Since the seat belt wearing assistance device 10 has each configuration shown in FIG. 3A, the overhanging arm 33 housed in the seat back 3 holds the seat belt 8 in a state where the occupant is seated and the door is closed. While rotating so as to project forward, a predetermined spring urging force can be accumulated in the coil spring 41 as a backup spring, and this accumulated spring urging force allows the occupant to perform an arm rotation operation as will be described later. After the elbow or the like becomes an obstacle and the arm rotation is prevented, and then the obstacle is removed, the overhanging arm 33 can perform a predetermined restoration rotation operation.

Hereinafter, the operation (at the time of normal operation) of the seatbelt attachment assisting device 10 according to the seating operation of the occupant will be described with reference to FIGS. 4A to 5B and the flowchart (FIG. 6).
FIG. 4A is a schematic configuration diagram showing an initial state in which the overhang arm mechanism 30, the drive transmission unit 40, and the drive source 50 are connected by the wires 35 and 45, which is the main configuration of the seatbelt wearing auxiliary device 10. It is. At this time, the overhang arm mechanism 30 is housed in the seat back 3 by the urging force of the torsion coil spring 37. In addition, the coil spring 41 of the drive transmission unit 40 has a free length (initial length), and the drive transmission unit from the tensile force in the extending direction, the wire 35 between the overhanging arm 33 and the drive transmission unit 40 and the drive source 50. The wire 45 extended to 40 is not tensioned to remove the slack.

  From this initial state, as shown in FIG. 4 (b), when the occupant opens the door and sits down, and the driver turns on the ignition key in the driver's seat, each detection unit detects whether the occupant is seated or the door is closed. The state is detected, the control unit 26 (FIG. 3A) receives each detection signal, the motor 51 rotates forward, the wire 45 is wound up, the coil spring 41 extends, and the wire 35 is moved by a predetermined amount. Pull in. At this time, the force with which the wire 35 is drawn is larger than the urging force of the torsion coil spring 37 of the overhanging arm 33, so the overhanging arm 33 rotates from the seat back 3 against the urging force of the torsion coil spring 37. 3. Project outside. At that time, the seat belt 8 is bent and protrudes forward by the belt holder 34 provided at the tip of the extension arm 33 (FIG. 4B). As shown in FIG. 4B, the wire winding amount at this time is the length of the extension arm 33 that fully extends and is extended until a predetermined tension (tension) is applied to the coil spring 41. When the motor load at that time is detected, the motor 51 stops rotating. In this state, the seated occupant can easily take the tongue 9 (FIG. 2) of the seat belt 8 located on the left side of the seating position and attach it to the buckle 21 (FIG. 2) located on the right side of the occupant. it can.

Thereafter, as shown in FIG. 4C, when the control unit 26 receives a signal indicating that the occupant properly wears the buckle 21, the control unit 26 rotates the motor 51 in the reverse direction. At that time, when the wire 45 is slightly drawn out, a biasing force in a retracting direction in which the coil spring 41 tries to return to the initial state acts, and the biasing force of the coil spring 41 is released, and the pushing out of the overhanging arm mechanism 30 is held. The wire 35 is in a free state. As a result, the extension arm 33 is rotated to the accommodation position in the seat back 3 by the urging force of the torsion coil spring 37 in the extension arm 33, and the wire 35 is pulled back to the extension arm 33 side (FIG. 4C). During this time, the motor 51 stops rotating (OFF state) after a predetermined time (Δt) has elapsed from the state shown in FIG. At this time, the overhanging arm 33 is held in the seat back 3 by the urging force of the torsion coil spring 37, and thereafter, the seat belt wearing assist device until the occupant removes the buckle 21 of the seat belt 8. The state where no power consumption for driving 10 itself is generated is maintained.
(When the operation is blocked by an obstacle to return operation)

  In FIG. 5 (a), in the state where the occupant is seated, for example, the elbow of the occupant is positioned in front of the overhanging arm 33, and the arm 33 protruding so as to fall down to a predetermined forward position is normally rotated. A blocked state is shown. Note that the forward rotation of the overhanging arm 33 is not an abrupt operation, so that only an arm rotation operation is prevented without an impact that may cause injury to the occupant. When a predetermined load is applied to the motor 51 in such a state, the forward rotation of the motor 51 is stopped in a state where the coil spring 41 as a backup spring is extended to some extent and biased. Thereafter, as shown in FIG. 5B, when the occupant's elbow or the like is retracted, the position and length of the wire 45 do not change, so the end of the coil spring 41 on the motor 51 side is fixed. In this state, the urging force (shrinking force) of the coil spring 41 acts to act to pull the wire 35. As a result, the overhang arm 33 can be rotated to the original overhang position as shown in FIG. Thereafter, the occupant can wear the seat belt 8 in the same manner as in FIGS.

In winding the wire 45 by the motor 51 described above, the rotation of the motor 51 is stopped with the coil spring 41 as a backup spring extended to a predetermined length. The biasing force will act. In order to prevent the take-up pulley from rotating in the pull-out direction at this time, it is preferable to incorporate a clutch or a worm gear or the like that is self-locked when the predetermined hoisting is completed in the gear train. It is also possible to prevent reverse rotation by electrically energizing a small motor current, not a mechanical measure.
(Modification of drive transmission unit)

  A modification in which the drive transmission unit 40 and the drive source 50 are made compact and can be incorporated into a frame (not shown) as a frame member of the rear seat will be described with reference to FIG. In the drive transmission unit 40 described above, as shown in FIG. 1, a linear coil spring 41 is connected in series to the end of the wire 35, and a wire 45 is connected in series to the other end of the coil spring 41. The route to (motor 51) was configured. As described above, it is assumed that the overhanging arm 33, the drive transmission unit 40, and the drive source 50 are arranged in series, and the rear part of the drive transmission unit 40 is located in the rear trunk.

On the other hand, in the modified example, as shown in FIG. 7, a mainspring spring 41 </ b> S is used in the drive transmission unit 40 instead of the coil spring 41 shown in FIG. Since the mainspring 41S can have a flat disk shape, the fixing portions at both ends of the spring can be formed in a half-shaped casing shape. The mainspring spring 41S includes a member in which the bearing member A that fixes the center side end portion so as to penetrate the center end side fixing portion and the half casing 48, and a casing 49 that covers the opposite surface in the same shape. The outer peripheral end side fixing portion of the mainspring spring 41S is held at the end portion. On both sides of the casings 48 and 49, fixing ends 48a and 49a and spiral guide surfaces 48b and 49b of the mainspring spring 41S are formed. The wire 35 and the end of the wire 45 are connected to the fixing ends of the casings 48 and 49, respectively. In FIG. 7, in order to clarify the arrangement of each component, the members are illustrated separately. However, the motor 51 and the mainspring spring 41S can be combined in a reduction gear box (not shown). Therefore, the drive transmission unit 40, the speed reducer 52, and the motor 51 can be integrated as an assembly. By adopting such a configuration, it is possible to reduce the size of the apparatus by directly attaching to the frame at the back position of the seat back of the rear seat in which the above-described mechanism is integrated and the extending arm 33 is incorporated. . In addition, since the spring coefficient of the mainspring spring can be set small, the motor capacity can also be reduced, power can be saved, and the overall assembly including the reduction gear and the motor can be downsized.
(Configuration of overhang arm)

  As described above, the overhanging arm 33 is usually accommodated in a notch having a predetermined shape formed on the surface of the seat back in a state where the rotating shaft at the lower end is supported. Then, due to the biasing force of the torsion coil spring attached to a part of the arm or the pulling force of the wire, the overhanging arm 33 can be rotated forward around the rotation axis at the lower end or can be returned to the notch again. it can. In the above description, a model in which the arm and the belt holder form an inverted L shape as shown in FIGS. 1 and 2 is shown as the shape of the overhang arm 33. However, in the rear seat of the actual vehicle, as shown in FIG. 8, the armrest 60 (shown in phantom line) provided in the interior of the door protrudes toward the passenger when the door is closed. Yes. Therefore, in order to equip the actual vehicle with the overhanging arm 33, the arm 33 does not interfere with the trajectory when the armrest 60 and the overhanging arm of the overhanging arm that extends the seat belt interfere with each other, and the arm 33 hits the flank of the occupant. It is necessary to make it a shape that does not touch.

FIG. 9 is a part shape diagram showing various overhanging arms 33. As shown in each figure, the arm main body 33d is a rod member in order to reduce the notch portion of the seat back and reduce the weight. Further, in order to avoid interference with the armrest 60 (FIG. 8) portion on the door side and to position the rotating shaft 32 in the vicinity of the vehicle outer end portion of the seat, it has a substantially L shape. Further, the belt holder 34 has a substantially cylindrical shape in the horizontal direction, but the both ends 34b are larger in diameter than the seat belt holding portion 34a so that the seat belt can be securely held at the center position, and the belt is shifted to the left and right. It is difficult. FIG. 4A shows a type in which the belt holder 34 is fixed and held at the center, and a simple and durable structure can be obtained. Since the projecting arm 33 shown in FIG. 5B rotatably supports the cylindrical belt holder 34, the friction between the seat belt and the belt holder 34 can be reduced when rotating, and is not necessary for the seat belt. Can be prevented from applying excessive tension. FIG. 2C shows a low-cost type overhanging arm 33 which is entirely made of a rod-like processed product. Although it is an inexpensive type, it is possible to minimize the notch portion formed in the seat back, and when considering the seat design and the like, it is possible to suppress a sense of incongruity when an additional device is incorporated in the seat back.
(Configuration of anti-pinch cover)

  As described above, for example, as shown in FIGS. 2 and 4 (a) to 4 (c), when the occupant is seated and the door is closed, the overhanging arm housed in the seat back 3 operates the motor. Accordingly, the seat belt 8 is rotated so as to project forward. When the occupant attaches the tongue 9 of the seat belt 8 to the buckle 21 (FIG. 2) located on the opposite side of the seat belt 8 on which the occupant is seated, the overhanging arm 33 performs a reversing operation to return into the seat back 3. However, if the elbow or the like of the occupant is located between the overhanging arm 33 and the seat back 3 at this time, the overhanging arm 33 is caught by the elbow and cannot be returned into the seat back 3. The return force of the overhanging arm 33 is a weak biasing force generated by the return spring mechanism, so that the occupant will not be injured, but in order to realize a smooth return operation of the overhanging arm 33 and a series of rotation operations of the overhanging arm 33 There is also a need for ingenuity not to show the passengers.

  FIG. 10 shows a state in which an occupant (not shown) is seated and the extending arm 33 pushes the seat belt 8 forward. At this time, on the passenger (not shown) side between the overhanging arm 33 and the seat back 3, a cover sheet 65 for preventing pinching is disposed so as to spread in a fan shape and cover the space. In the state in which the overhanging arm 33 is accommodated, the cover sheet 65 is composed of a fan-shaped cloth sheet that is accommodated in a folded state in the notch of the seat back 3 as shown in FIG. . When the overhanging arm 33 pivots forward from this stowed state, as shown in FIG. 5B, the fan arm is unfolded between the overhanging arm 33 and the seat back 3, and the overhanging arm 33 projects from the passenger side. It plays a role of closing a gap formed between the arm 33 and the seat back 3. FIG. 12 is an enlarged view showing the configuration of the cover sheet 65 shown in FIG. As shown in the figure, the front end 65a is attached to the overhanging arm 33, the rear end 65b is attached to a fixing portion (not shown) in the cushion 3d in the seat back 3, and the overhanging arm 33 rotates forward. When moved, the entire cover sheet 65 is expanded in a fan shape.

  FIG. 13 shows a modification using a cover sheet 65 in which the accordion shape is previously folded. By making the cover sheet 65 into a bellows shape in this way, the shape at the time of folding is determined, so the cushion 3d in the seat back 3 is cut out to a predetermined dimension, and the cover sheet 65 is securely stored therein. Can do.

  14 and 15, instead of the rod-shaped overhanging arm 33 described above, a part of the seat cushion 3d is formed as a triangular prism-shaped block 66 having a substantially wedge shape in plan view, as shown in FIG. The structure which provided the rotation fulcrum 67 in the lower end is shown. According to the projecting member of this shape (hereinafter referred to as a block 66), a space in which the block 66 can be accommodated is formed in the seat back 3, and the seat back skin 66a side of the block 66 is the seat back in the accommodated state. Since it is accommodated so as to be flush with the skin of the back 3, the seat back 3 is notched, and the housing state of the overhanging arm 33 is not exposed from the notch, so that the seat design is very attractive. Good. In addition, by configuring the block 66 with a lightweight foam similar to a cushion, the specifications of the drive spring and the like can be the same as or weaker than the overhanging arm 33. Further, as shown in FIG. 14, since the side surface 66b of the block 66 is located between the seat belt 8 and the seat back 3 that protrudes, the effect of closing the gap portion as well as the cover sheet 65 is achieved. .

The schematic perspective view which showed the backseat seat equipped with the seatbelt mounting assistance apparatus of this invention. The schematic perspective view which showed the operation state of the seatbelt mounting assistance apparatus shown in FIG. The schematic block diagram which showed the structure of the seatbelt mounting assistance apparatus, and its operation example. Operation | movement explanatory drawing which showed the operation | movement procedure of a seatbelt mounting assistance apparatus (at the time of normal operation). Operation | movement explanatory drawing which showed the operation | movement procedure of the seatbelt mounting assistance apparatus (at the time of operation | movement prevention cancellation | release). The operation | movement flowchart which showed the operation | movement procedure of the seatbelt mounting assistance apparatus. The schematic structure perspective view which showed the modification of the seatbelt mounting assistance apparatus. The fragmentary perspective view which showed the example of the installation to the seat back of the extension arm of a seatbelt mounting auxiliary device. The front view which showed the example of the shape of the overhanging arm. The partial perspective view which showed the operation state of the overhang | projection arm shown in FIG. 8, and the expansion | deployment state of a cover sheet. The side surface fragmentary sectional view which showed the operation state of the overhang | projection arm, and the expansion | deployment state of the cover sheet. The elements on larger scale which showed the unfolded state of the cover sheet. The elements on larger scale which showed the modification of the cover sheet. The side surface enlarged view which showed the example which used the block as a modification of an overhang | projection arm. The state explanatory drawing which showed the state which rotated the block shown in FIG. 14, and extended the seat belt ahead.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat belt apparatus 2 Seat part 6 Retractor 8 Seat belt 9 Tongue 10 Seat belt mounting assistance apparatus 21 Buckle 22 Seating detection sensor 26 Control part 30 Overhang arm mechanism 33 Overhang arm 34 Belt holder 35 Arm drive wire 37 Torsion coil spring 40 Drive transmission part 41 coil spring 41S mainspring spring 45 wire 50 drive source 51 motor 52 speed reducer 65 cover sheet 66 block

Claims (9)

A projecting arm drive that can hold and hold a seat belt housed in a part of the seat back and stretched along the seat back from the seat back surface forward according to the rotation of the projecting arm. And
A wire connected to the projecting arm drive unit, a drive transmission unit having an elastic member interposed in series in the path of the wire,
A drive source capable of operating the arm drive unit by winding or pulling the wire connected to the drive transmission unit and applying a predetermined urging force to the elastic member;
A detection unit that detects the seating state of the occupant,
Detecting an occupant seated at the detection unit, operating the arm drive unit by winding the wire of the drive source, and projecting a part of the seat belt to a side position of the occupant to mount the occupant's seat belt A seatbelt wearing assistance device characterized by assisting.   The overhang arm drive unit is housed in a notch formed in the seat back, and is always housed in the notch by the biasing force of a torsion coil spring, and the drive unit is configured to move the elastic member of the drive transmission unit. 2. A part of the seat belt is extended by extending the wire and winding the wire to rotate the extension arm forward against the urging force of the torsion coil spring. The seatbelt wearing auxiliary device according to 1.   A spring biasing force applied by extension of an elastic member of the drive transmission unit allows the extension arm to protrude forward against the biasing force of the torsion coil spring after the drive source is stopped. The seatbelt wearing assist device according to claim 1 or 2.   The seat belt wearing assist according to any one of claims 1 to 3, wherein the drive source is an electric motor with a reduction gear having a member that winds up a wire extending from the drive transmission portion. apparatus.   The seatbelt wearing assist device according to claim 1, wherein the elastic member of the drive transmission unit is a tension coil spring.   The seatbelt wearing assist device according to claim 1, wherein the elastic member of the drive transmission unit is a mainspring spring.   2. The seat belt wearing assistance device according to claim 1, wherein the overhanging arm includes a bent arm that avoids interference with an indoor protrusion member of the door.   A cover sheet is provided between the overhanging arm and the seat back, and the cover sheet unfolds in a fan shape between the arm and the seat back surface by rotating the overhanging arm forward. The seatbelt wearing auxiliary device according to claim 1, wherein   The overhang arm drive unit is composed of a rotating member that replaces a part of the cushion in the seat back, and the skin surface rotates from an initial state that is flush with the skin of the seat back. 2. The seat belt wearing assist device according to claim 1, wherein the seat belt is projected forward on the skin surface.

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