JP5199200B2 - Seat belt device - Google Patents

Description

  The present invention relates to a seat belt device for restraining the body of an occupant seated on a vehicle seat, for example.

  Patent Document 1 below discloses an example of a buckle device that constitutes a seat belt device. In this buckle device, when the motor is driven, a cam (referred to as “first cam member” in Patent Document 1) is rotated by this driving force. When the cam rotates, a cam follower (referred to as “second cam member” in Patent Document 1) moves in the direction of the rotation axis of the cam. As a result, when the arm mechanically connected to the cam follower moves in the direction of the rotation axis of the cam, the protrusion provided on the arm comes out of the recess provided on the block, and the rotation restriction on the arm is released. When the cam further rotates in this state, the rotational force of the cam is transmitted to the arm via the cam follower, and the arm turns. This raises the buckle.

JP 2006-298257 A

  This buckle device has a complicated structure because the cam follower is moved in the axial direction of the cam together with the arm by the rotational force of the cam to release the arm turning restriction. In addition, when the cam follower is moved in the axial direction of the cam, a large friction is generated between the cam and the cam follower. For this reason, in order to operate reliably, the output of a drive means must be enlarged and the whole apparatus will enlarge.

  In the present invention, in consideration of the above facts, a buckle or an anchor that can move between the restraint position and the assist position can be restrained from moving at the restraint position, and the structure for restricting the movement and releasing it is simple. The object is to obtain a belt device.

  In the seat belt device according to the first aspect of the present invention, the buckle for holding the tongue is attached by mounting the anchor provided at the tip of the webbing belt or the tongue provided on the webbing belt. A support member, an intermediate member connected to the support member so as to be relatively rotatable with respect to the support member and displaceable in a predetermined direction with respect to the support member; and the intermediate member is moved by an output driving force. The driving means for moving in the predetermined direction and the support are connected, and the support rotates relative to the intermediate member while restricting the movement of the support when the intermediate member moves in the predetermined direction. The movement direction of the support is changed from the restraint position where the buckle or the anchor is located on the rear end side of the seat to the front side or above the restraint position. And a restricting means for restricting movement to an assist position where the buckle or the anchor is located, and the support is engaged with the support in a state where the support is in the restrained position, and the assist is in the engaged state with respect to the support. A restricting means capable of restricting the movement of the support to a position; and provided in the intermediate member, wherein the support is engaged with the restricting means when the support is in the restrained position. Lock means for maintaining movement restriction and disengagement of the movement restriction by the restriction means when the intermediate member is displaced in the predetermined direction with respect to the support to disengage the restriction means; It is equipped with.

  In the seat belt device according to the first aspect of the present invention, when the driving force is output from the driving means and the intermediate member moves in the predetermined direction, the support coupled to the intermediate member moves together with the intermediate member. To do. However, limiting means is connected to the support, and if the support is to be moved along with the intermediate member moving in a predetermined direction, the movement of the support is limited to the limiting means. As the support moves in the predetermined direction, the support rotates relative to the intermediate member while moving in the predetermined direction.

  As described above, the buckle or the anchor attached to the support member is moved to the rear end of the seat by moving the support member relative to the intermediate member by the movement restriction by the restriction unit while moving in the predetermined direction together with the intermediate member. It moves from the restraining position on the side to the assist position in front of or above the seat from the restraining position.

  By the way, the seat belt device according to the present invention is provided with the restricting means, and the restricting means is engaged with the support body in a state where the buckle or the anchor is in the restraining position. In such an engaged state of the restricting means with respect to the support, the locking means provided on the intermediate member is engaged with the restricting means. In this state, if the support member is moved to the assist position side without moving the intermediate member in a predetermined direction, the restricting means interferes with the support member. The restricting means that interferes with the support attempts to move so as to eliminate the interference by the pressing force from the support, but the locking means engaged with the restricting means maintains the interference of the restricting means with the support. For this reason, a support body cannot be moved to the assist position side.

  From this state, when the driving force is output from the driving means as described above, first, the support whose movement is restricted by the restriction means does not move, and the intermediate member moves in a predetermined direction relative to the support. Moving. In this way, when the intermediate member moves in the predetermined direction, the engagement of the locking means with the restricting means is released. As described above, when the engagement of the locking unit with the regulating unit is released, the movement restriction of the support body by the regulating unit can be eliminated, and the support body can move to the assist position side.

  As described above, the seat belt device according to the present invention does not require a special driving force (a driving force different from the driving force output from the driving unit) only for canceling the movement restriction of the support by the limiting unit. is there. Moreover, since the movement restriction of the support body by the restricting means can be eliminated by moving the intermediate member in the predetermined direction for moving the support body to the assist position side, in order to eliminate the movement restriction of the support body by the restricting means, A mechanism for moving the intermediate member in a direction different from the predetermined direction is also unnecessary.

  A seat belt device according to a second aspect of the present invention is the seat belt device according to the first aspect of the present invention, wherein the seat belt device is integrally provided on one of the intermediate member and the support, or any one of the intermediate member and the support. A shaft portion that is rotatably supported, and is formed on the other of the intermediate member and the support, and the shaft portion enters the inside so that the other of the other is rotatably supported by the shaft portion. At the same time, the intermediate member and the support are connected by a hole portion whose inner peripheral shape is larger than the outer peripheral shape of the shaft portion and the shaft portion is movable in the predetermined direction on the inner side.

  In the seat belt device according to the second aspect of the present invention, the shaft portion that is integrally provided on one of the intermediate member and the support body or that rotatably supports any one of the intermediate member and the support is provided in the middle. It enters the inside of the hole formed in the other of the member and the support body, and thereby the intermediate member and the support body are connected to each other so as to be relatively rotatable around the shaft portion.

  Here, the inner peripheral shape of the hole formed in the other of the intermediate member and the support is larger than the outer peripheral shape of the shaft portion. Therefore, the shaft portion is movable inside the hole portion. For this reason, when the movement of the support is restricted by the restricting means, a driving force is output from the driving means. As a result, when the intermediate member moves in a predetermined direction, the shaft moves inside the hole. Thus, the intermediate member can move in a predetermined direction while the movement of the support is restricted.

  A seat belt device according to a third aspect of the present invention is the seat belt device according to the first or second aspect of the present invention, wherein the seat belt device pivots in the predetermined direction around the base end side by the driving force of the driving means, A swivel arm that is rotatable relative to the support and that is pivotally connected to the distal end side so as to be able to swivel relative to the support in the predetermined direction about the base end is used as the intermediate member. Yes.

  According to the third aspect of the present invention, when the driving force is output from the driving means, the turning arm as the intermediate member turns in a predetermined direction around the base end side. Thereby, the engagement of the locking means with the restricting means is canceled, and consequently, the movement restriction of the support by the restricting means is canceled. When the turning arm further turns in a predetermined direction in this state, the support body rotates around the tip end side of the turning arm while rotating together with the turning arm, and moves to the assist position side.

  Thus, in the present invention, the intermediate member is a turning arm, and the movement of the turning arm in a predetermined direction is turning about the base end side of the turning arm. For this reason, it is not necessary to convert the driving force of the driving means into a linear motion, and the structure becomes simple.

  A seat belt device according to a fourth aspect of the present invention is the seat belt device according to the third aspect of the present invention, wherein the seat belt device rotates about an axis about the base end side and having the same direction as the pivot axis direction of the pivot arm as an axial direction. The restricting means is a link member that is connected to the support body so that the distal end side is rotatable relative to the support body about an axis whose axial direction is the same direction as the pivot axis direction.

  According to the seatbelt device of the present invention as set forth in claim 4, the link member as the restricting means is rotatable around an axis having the same direction as the turning axis direction of the turning arm as the axial direction around the base end side. In addition, the distal end side is connected to the support body so as to be relatively rotatable around an axis whose axial direction is the same direction as the turning axis direction of the turning arm. That is, in the present invention, a link mechanism is constituted by the swing arm, the support body, and the link member, and the buckle can be moved from the restraining position to the assist position by the movement of the link mechanism, and further, by the regulating means. It is also possible to eliminate the movement restriction of the support.

  According to a fifth aspect of the present invention, there is provided a seat belt device according to the fourth aspect of the present invention, further comprising a biasing unit that biases the support body toward the assist position with respect to the swing arm. .

  According to the seatbelt device of the present invention as set forth in claim 5, the support body is urged toward the assist position by the urging means with respect to the turning arm. For this reason, in a state where the buckle or the anchor is located at the restraining position and the restricting means is engaged with the support, the support that is biased toward the assist position by the biasing means is interfered with the restricting means. Movement of the support to the assist position side is restricted.

  As described above, when the buckle or the anchor is moved from the assist position to the restraint position, the urging force of the urging means is not in the predetermined direction described above, and the support body is urged toward the assist position side to thereby restrict the regulating means. Therefore, the movement of the support to the assist position side can be restricted in a state where the buckle or anchor is at the restraining position.

  As described above, the seatbelt device according to the present invention can restrict the movement of the buckle or the anchor that can move between the restraining position and the assist position at the restraining position, and the structure for restricting the movement and the release thereof. Can be easy.

It is a disassembled perspective view which shows the structure of the principal part of the seatbelt apparatus which concerns on the 1st Embodiment of this invention. It is a top view which shows the structure of the principal part of the seatbelt apparatus which concerns on the 1st Embodiment of this invention. It is a side view of the seat to which the seat belt device concerning a 1st embodiment of the present invention is applied, and shows the state where a buckle exists in a restraint position. It is a side view corresponding to FIG. 5 which shows the state which has a buckle in an assist position. It is an enlarged side view of the principal part which shows the state of an intermediate member and a support body in the state where the buckle was located in the restraint position. FIG. 6 is an enlarged side view corresponding to FIG. 5 illustrating a state in which the intermediate member has moved in a predetermined direction with respect to the support body with the buckle positioned at the restraining position. FIG. 6 is an enlarged side view corresponding to FIG. 5, showing a state in which cancellation of the support movement restriction by the restricting means is started. FIG. 6 is an enlarged side view corresponding to FIG. 5, showing a state in which the intermediate member, the support, and the regulating means are further moved from the state shown in FIG. 7. FIG. 6 is an enlarged side view corresponding to FIG. 5, showing a state in which the restriction on movement of the support by the restricting means is eliminated. 9 is an enlarged side view corresponding to FIG. 5 showing a state in which the intermediate member and the support body have further moved from the state shown in FIG. FIG. 6 is an enlarged side view corresponding to FIG. 5 showing a state in the middle of returning from the assist position to the restraint position. FIG. 6 is an enlarged side view corresponding to FIG. 5 showing a state in which the movement restriction of the support body by the restriction means is started. FIG. 13 is an enlarged side view corresponding to FIG. 5 showing a state in which the intermediate member and the support body are further moved from the state shown in FIG. 12. FIG. 14 is an enlarged side view corresponding to FIG. 5, showing a state in which the intermediate member and the support body are further moved from the state shown in FIG. 13. It is a disassembled perspective view which shows the structure of the principal part of the seatbelt apparatus which concerns on the 2nd Embodiment of this invention. FIG. 6 is an enlarged side view corresponding to FIG. 5 illustrating a state of the intermediate member and the support body in a state where the buckle is positioned at the restraining position in the seat belt device according to the second embodiment of the present invention. FIG. 6 is an enlarged side view corresponding to FIG. 5 illustrating a state in the middle of returning from the assist position to the restraint position in the seat belt device according to the second embodiment of the present invention.

<Configuration of First Embodiment>
FIG. 3 is a side view of a vehicle seat 12 to which the seat belt device 10 according to the first embodiment of the present invention is applied.

  As shown in this figure, the seat belt apparatus 10 includes a buckle 14. The buckle 14 is fixed to the front end in the longitudinal direction of a stay 18 as a support provided on the side in the width direction of the seat cushion 16 constituting the seat 12. The stay 18 is formed in a narrow plate shape whose thickness direction is along the width direction of the seat cushion 16. A link member 20 as a limiting member is provided on the side of the stay 18 in the thickness direction. For example, the link member 20 is formed in a narrow plate shape whose thickness direction is along the width direction of the seat cushion 16, and the distal end side of the link member 20 is in the longitudinal direction intermediate portion of the stay 18 in the thickness direction. The shaft 18 is connected so as to be rotatable relative to the stay 18 around an axis.

  The base end side in the longitudinal direction of the link member 20 is connected to a cushion frame 22 that supports the cushion portion of the seat cushion 16 from below so as to be rotatable about an axis whose axial direction is the width direction of the seat 12. Is attached to the cushion frame 22 via the stay 18 and the link member 20. A tongue 24 is attached to the buckle 14. The tongue 24 is provided at an intermediate portion in the longitudinal direction of the webbing belt 26 formed in a long belt shape. The base end side of the webbing belt 26 is locked to a spool (not shown) of a webbing take-up device attached to a vehicle body, a frame member constituting the seat 12 or the like on the side opposite to the buckle 14 along the width direction of the seat 12. ing.

  On the side where the webbing take-up device is provided, a slip joint 30 is provided above the seat back 28 constituting the seat 12. The slip joint 30 is attached in the vicinity of the upper end portion of the pillar 32 of the vehicle, and the longitudinal direction proximal end side of the webbing belt 26 (that is, the portion of the webbing belt 26 wound around the spool of the webbing take-up device) and the tongue. The webbing belt 26 passes through the slip joint 30 and is folded back to the lower side of the seat 12 between the portion provided with 24. Thus, the tip of the webbing belt 26 folded back by the slip joint 30 is engaged with the anchor fixed to the vehicle body, the frame portion of the seat 12 or the cushion frame 22 in the vicinity of the lower portion of the seat 12. .

  When the occupant moves the tongue 24 toward the buckle 14 while the occupant is seated on the seat 12, the webbing belt 26 is pulled by the tongue 24, and the webbing belt 26 is pulled out from the spool of the webbing take-up device. The webbing belt 26 pulled out in this way is hung around the occupant's body on the front side of the occupant, and the tongue 24 is attached to the buckle 14 in this state.

On the other hand, the seat belt device 10 includes a motor actuator 40 as a driving means. The motor actuator 40 is attached to the cushion frame 22 of the seat 12, for example. The motor actuator 40 includes a motor and a speed reduction mechanism that decelerates and outputs the driving force (rotational force) of the motor. The driving force of the motor decelerated by the deceleration mechanism is output by the output shaft 42. The output shaft 42 has an axial direction along the width direction of the seat 12, and a turning arm 44 as an intermediate member is attached to the output shaft 42 of the motor actuator 40 at the tip thereof. As shown in FIGS. 1 and 2, the swing arm 44 includes a pair of arm pieces 46 and 48. Each of the arm pieces 46 and 48 is formed in a narrow plate shape whose thickness direction is along the width direction of the sheet 12. These arm pieces 46 and 48 are attached to the output shaft 42 on the base end side in the longitudinal direction with the longitudinal directions facing the same direction.

  On the other hand, at the distal end side of these arm pieces 46 and 48, the longitudinal base end portion of the stay 18 enters between the arm piece 46 and the arm piece 48. A pair of strikers 52 are formed at the proximal end of the stay 18. The striker 52 is formed in a disk shape or a columnar shape whose axial direction is along the thickness direction of the stay 18, and one striker 52 is formed on the surface of one side in the thickness direction of the stay 18, and the other striker 52 is formed. 52 is formed on the surface of the stay 18 on the other side in the thickness direction. The striker 52 has the same outer diameter, and the other striker 52 is coaxially formed with respect to one striker 52.

  A shaft portion 62 is formed at the tip of the striker 52 (the surface of the striker 52 opposite to the stay 18). The shaft portion 62 is formed in a disk shape or a columnar shape having a smaller diameter than the striker 52. These shaft portions 62 have the same outer diameter and are formed coaxially with the striker 52. A long hole 68 as a hole is formed on the distal end side in the longitudinal direction of each of the arm pieces 46 and 48 corresponding to these shaft portions 62.

  The long hole 68 has a longitudinal direction along the rotational circumferential direction when the arm pieces 46 and 48 rotate around the output shaft 42, and has an inner width dimension (that is, a dimension along the rotational radius direction of the arm pieces 46 and 48). ) Is slightly smaller than the outer diameter of the shaft portion 62. One of the pair of shaft portions 62 described above enters the inside of the long hole 68 formed in the arm piece 46, and the other shaft portion 62 enters the inside of the long hole 68 formed in the arm piece 48. Yes. As described above, since the shaft portion 62 is elongated along the circumferential direction of rotation when the arm pieces 46 and 48 are rotated, the shaft portion 62 is located between one end and the other end of the long hole 68 in the longitudinal direction. The inside of the long hole 68 can be moved.

  In this embodiment, the hole portion into which the shaft portion 62 enters is the long hole 68, but the shaft portion 62 can move in the rotation circumferential direction when the arm pieces 46, 48 rotate inside the hole portion. The inner peripheral shape of the hole portion only needs to be larger than the outer peripheral shape of the shaft portion 62. Therefore, the shape of the hole portion is not limited to the shape of the long hole 68 described above.

  On the other hand, as shown in FIGS. 1 and 5, a latch 82 serving as a restricting means is provided on the side of the distal end portion in the longitudinal direction of the turning arm 44. As shown in FIG. 1, the latch 82 includes a pair of latch pieces 84 and 86. Each of the latch pieces 84 and 86 includes a plate-like base portion 88 whose thickness direction is along the width direction of the sheet 12. The base portion 88 of the latch piece 84 and the base portion 88 of the latch piece 86 are opposed to each other via a space slightly larger than the thickness dimension of the stay 18.

  As shown in FIG. 2, a cylindrical bearing portion 90 is provided between the base portion 88 of the latch piece 84 and the base portion 88 of the latch piece 86, and the base portion 88 of the latch piece 84 is provided by the bearing portion 90. The base 88 of the latch piece 86 is integrally connected. Both base portions 88 are formed with circular holes 92 corresponding to the inner peripheral portion of the bearing portion 90. A shaft portion 94 passes through the circular hole 92 of the latch piece 84, the through hole of the bearing portion, and the circular hole 92 of the latch piece 86. The shaft portion 94 is fixed to the cushion frame 22 and rotatably supports the latch 82.

  Further, as shown in FIG. 1, a torsion spring 96 is provided in the bearing portion between the latch piece 84 and the latch piece 86. One end of the torsion spring 96 is locked to the base 88 of the latch piece 84 or the base 88 of the latch piece 86, and the other end is locked to the cushion frame 22, and from the latch piece 84 side to the latch piece 86 side. The latch 82 is urged in the clockwise direction toward the right.

  On the other hand, the engagement piece 102 is continuously extended from each base portion 88 of both the latch pieces 84 and 86. The engagement piece 102 has a narrow plate shape whose thickness direction is along the thickness direction of the base portion 88. Is formed. Further, the engagement piece 104 is continuously extended from the respective base portions 88 of the latch pieces 84 and 86. The engagement piece 104 has a thickness in the longitudinal direction substantially the same as the longitudinal direction of the engagement piece 102. The direction is formed in a narrow plate shape along the thickness direction of the base 88. The engaging piece 102 and the engaging piece 104 are formed in parallel with each other, and the interval is set slightly larger than the outer diameter dimension of the striker 52 described above.

  For this reason, the striker 52 can enter between the engagement piece 102 and the engagement piece 104. Here, as shown in FIG. 2, when the buckle 14 is in the restraining position, the striker 52 enters between the engagement piece 102 and the engagement piece 104 as shown in FIG. 5. In this state, the shapes of the latch pieces 84 and 86 including the engagement piece 102 and the engagement piece 104 are set so that the width direction of the engagement piece 102 and the engagement piece 104 is substantially along the longitudinal direction of the stay 18. Yes.

  On the other hand, a through-hole 106 is formed on the distal end side of each arm piece 46, 48 from the position where the long hole 68 is formed in each arm piece 46, 48. Further, a lock shaft 112 as a lock means is provided on the distal end side of the arm pieces 46 and 48 in which these through holes 106 are formed. The lock shaft 112 is formed in a cylindrical shape whose axial direction is along the thickness direction of the arm pieces 46, 48, and one end side thereof penetrates the through hole 106 formed in the arm piece 46, and the other end side is an arm. The through-hole 106 formed in the piece 48 is penetrated.

  Corresponding to the lock shaft 112, a contact portion 114 is formed on each base portion 88 of the latch pieces 84, 86. The contact portion 114 is formed so as to protrude further outward than the outer peripheral portion of each base portion 88 of the latch pieces 84 and 86. In this contact portion 114, with the top portion 116 protruding most from the outer peripheral portion of the base 88 as a boundary, the surface on one side of the contact portion 114 is a contact slope 118, and the other side is a contact slope 120. Yes. The shape of the contact portion 114 is set so that the top portion 116 and the contact slopes 118 and 120 interfere with the outer peripheral portion of the lock shaft 112 when each of the swing arm 44 and the stay 18 reaches a predetermined rotation position. Has been.

<Operation and Effect of First Embodiment>
Next, the operation and effect of the present embodiment will be described.

  According to the seat belt device 10, the buckle 14 is positioned at the restraining position shown in FIG. 2 when no occupant is seated on the seat 12. In this state, as shown in FIG. 5, the striker 52 enters between the engagement piece 102 and the engagement piece 104. Further, in this state, the lock shaft 112 is in contact with the contact inclined surface 120 of the contact portion 114 from the clockwise direction side of the latch 82 with the shaft portion 94 as the center.

  In this state, when the stay 18 is pulled toward the distal end side in the longitudinal direction, the striker 52 presses the engagement piece 104 toward the distal end side in the longitudinal direction of the stay 18 to rotate the latch 82 clockwise in FIG. And However, if the latch 82 tries to rotate in the clockwise direction in this state, the contact inclined surface 120 interferes with the lock shaft 112, thereby restricting the rotation of the latch 82. Thus, since the latch 82 cannot rotate even when the stay 18 is pulled toward the longitudinal end, the striker 52 is interfered with the engagement piece 104 of the latch 82 and engaged with the engagement piece 102 of the latch 82. The striker 52 cannot come out from between the pieces 104. Accordingly, in this state, the stay 18 cannot be pulled and moved to the tip side.

  In this state, for example, when the lock of the vehicle door or the like is released and the door is opened, the control means for controlling the motor of the motor actuator 40 drives the motor in the normal direction. The forward rotation driving force of the motor is decelerated by the speed reduction mechanism, and rotates the output shaft 42 around one of the axes (in the counterclockwise direction in the state shown in FIG. 2). When the output shaft 42 rotates in the forward direction, the arm pieces 46 and 48 of the turning arm 44 turn together with the output shaft 42 in the counterclockwise direction in the state shown in FIG. Even when the turning arm 44 turns in this way, the stay 18 cannot move to the front end side in the longitudinal direction because the movement of the striker 52 is restricted by the engagement piece 104.

  However, the stay 18 not only can rotate relative to the arm pieces 46 and 48 around the shaft portion 62, but the shaft portion 62 of the stay 18 moves from one end to the other end in the longitudinal direction of the long hole 68. Therefore, even if the movement of the stay 18 is restricted, the turning arm 44 can rotate until the shaft portion 62 contacts the upper end of the long hole 68.

  As shown in FIG. 6, when the turning arm 44 rotates, the shaft portion 62 moves to the lower end side of the long hole 68, and the lock shaft 112 moves to the top portion 116 side of the contact portion 114. When the turning arm 44 further rotates, as shown in FIG. 7, the lock shaft 112 moves beyond the top 116 of the contact portion 114 to the contact slope 118 side. In a state where the lock shaft 112 is moved toward the contact slope 118, unlike the state where the contact slope 120 is in contact with the lock shaft 112, the lock shaft 112 is rotated by rotating the lock shaft 112 together with the turning arm 44. 7 and 8, the latch 82 is pressed by the pressing force from the striker 52 received by the engagement piece 104 until the contact slope 118 contacts the lock shaft 112, as shown in FIGS. 7 and 8. The shaft portion 94 can be rotated in the clockwise direction.

  Further, as shown in FIG. 8, when the swing arm 44 and the latch 82 rotate as described above, the striker 52 engages with the engagement piece 104 when the engagement piece 104 moves away from the striker 52 as shown in FIG. 8. It is possible to escape from between the pieces 102. Therefore, when the swivel arm 44 further rotates in this state, the striker 52 comes out from between the engagement piece 104 and the engagement piece 102 as shown in FIG. 9, and as shown in FIG. The swivel arm 44 rotates to move 52 away from the latch 82.

  Further, since the turning arm 44, the link member 20, and the stay 18 constitute a so-called “four-bar linkage mechanism”, the turning arm 44 turns as described above, and the stay 18 rotates along with the turning arm 44. When it moves, the swing arm 44 whose movement is regulated by the stay 18 rotates to the right with the shaft portion 62 as the center, while rotating the stay 18 counterclockwise. . As shown in FIG. 4, the buckle 14 reaches the assist position when the stay 18 stands by the turning of the turning arm 44. The buckle 14 that has reached the assist position is located above and in front of the buckle 14 at the restraining position. Therefore, an occupant seated on the seat 12 can easily attach the tongue 24 to the seat 12.

  When the tongue 24 is attached to the buckle 14, the above-mentioned control means drives the motor of the motor actuator 40 in the reverse direction to rotate the output shaft 42 in the other direction (the clockwise direction in the state shown in FIG. 4). When the output shaft 42 rotates in the reverse direction, the arm pieces 46 and 48 of the turning arm 44 turn together with the output shaft 42 in the clockwise direction in the state shown in FIG. In this way, the striker 52 approaches the latch 82 as shown in FIG. 11 by turning the turning arm 44 clockwise. When the turning arm 44 further turns clockwise from the state shown in FIG. 11, the striker 52 contacts the engaging piece 102 on the distal end side of the engaging piece 102 as shown in FIG. The striker 52 presses the engagement piece 102 downward with the rotational force of. Thereby, the latch 82 rotates counterclockwise around the shaft portion 94.

  When the turning arm 44 further turns clockwise in this state, the lock shaft 112 comes into contact with the contact slope 118 of the contact portion 114, and the lock shaft 112 presses the contact slope 118 downward instead of the striker 52. The latch 82 is rotated counterclockwise. When the pivot arm 44 is rotated clockwise and the latch 82 is rotated counterclockwise in this way, the lock shaft 112 reaches the top 116 of the abutting portion 114 as shown in FIG. As shown in FIG. 4, the lock shaft 112 moves to the contact slope 120 side of the contact portion 114.

  Thus, in a state where the lock shaft 112 is moved to the contact slope 120 side of the contact portion 114, the facing direction of the lock shaft 112 and the contact slope 120 is substantially along the rotational radius direction of the turning arm 44. For this reason, even if the turning arm 44 rotates clockwise from this state, the lock shaft 112 does not press the contact slope 120. Furthermore, in this state, the striker 52 that has entered between the engagement piece 104 and the engagement piece 102 tries to rotate the latch 82 by pressing the engagement piece 102 downward. Since the urging force of the spring 96 resists, the latch 82 does not rotate.

  Therefore, in this state, when the turning arm 44 rotates, the shaft portion 62 relatively moves so as to approach the upper end of the long hole 68 and returns to the initial state, and the buckle 14 returns to the restraining position. In this state, the lock shaft 112 is again brought into contact with the contact inclined surface 120 of the contact portion 114 to restrict the latch 82 from rotating clockwise.

  As described above, in the state where the buckle 14 is in the restraining position, the stay 18 cannot be moved even if the stay 18 is pulled toward the distal end side in the longitudinal direction. For this reason, even if the occupant's body attempts to move inertially toward the vehicle front side when the vehicle decelerates and the buckle 14 is pulled via the webbing belt 26 and the tongue 24, the buckle 14 is held in the restrained position. It can be restrained reliably.

  Further, the movement restriction of the stay 18 by the latch 82 and the release thereof can be performed only by the rotation of the latch 82. Moreover, the lock of the latch 82 for maintaining the movement restriction of the stay 18 is formed by the lock shaft 112 of the turning arm 44, and the unlocking of the latch 82 by the lock shaft 112 moves the stay 18 from the restraint position to the assist position. For this purpose, the swing arm 44 is turned. Thus, the structure of the turning arm 44 is simple because the latch 82 can be locked and unlocked by the lock shaft 112 without performing any movement other than turning. In addition, since rotation transmission due to friction is not performed, the rotational force of the motor can be efficiently contributed to the movement of the buckle 14 between the restraint position and the assist position.

<Configuration of Second Embodiment>
Next, a second embodiment of the present invention will be described.

  In the description of the present embodiment, the same reference numerals are given to the same parts as those in the first embodiment, and the description thereof is omitted.

  FIG. 15 is an exploded perspective view corresponding to FIG. 1 showing the configuration of the main part of the seat belt device 10 according to the first embodiment. FIG. 16 is a side view corresponding to FIG. 5 in which the configuration of the main part of the seat belt device 160 according to the present embodiment shows the configuration of the main part of the seat belt device 10 according to the first embodiment. It is shown by the figure.

  As shown in these drawings, the seat belt device 160 is basically the same as the configuration of the seat belt device 10 according to the first embodiment, but a pair of torsion springs as biasing means. The seat belt device 160 is different from the seat belt device 10 according to the first embodiment in that the seat belt device 160 is provided. The torsion springs 162 are provided on both sides of the stay 18 in the thickness direction. One of the torsion springs 162 is locked to the stay 18 and the other end is locked to the arm piece 46. . On the other hand, one end of the other torsion spring 162 is locked to the stay 18 and the other end is locked to the arm piece 48.

<Operation and Effect of Second Embodiment>
The seat belt device 160 having the above configuration basically operates in the same manner as in the first embodiment when the motor actuator 40 as the driving means is activated. Therefore, basically the same operation as that of the first embodiment is achieved, and as a result, the same effect as that of the first embodiment can be obtained.

  On the other hand, if the buckle 14 has reached the assist position and the motor actuator 40 does not operate, the buckle 14 is manually returned to the restraining position, and the striker 52 is engaged with the engagement piece 104, the engagement piece 102, and the like. I will get in between.

  Here, when the buckle 14 is returned to the restrained position by the driving force of the motor actuator 40, as shown in FIG. 11, the upper end portion of the long hole 68 pulls the shaft portion 62 to rotate the stay 18. . On the other hand, when the buckle 14 is manually returned to the restraining position, the shaft portion 62 presses the lower end portion of the long hole 68 with a force for pushing back the buckle 14 to forcibly rotate the turning arm 44 clockwise. .

  Therefore, when the buckle 14 is manually returned to the restraining position, the shaft portion 62 is in contact with the lower end portion of the long hole 68 as shown in FIG. Here, in this embodiment, when the application of the force to push back the buckle 14 is canceled in this state, the torsion spring 162 moves the stay 18 away from the revolving arm 44 by the biasing force. Thereby, as shown in FIG. 5, the shaft portion 62 moves to the upper end side of the long hole 68.

  As described above, even if the buckle 14 is manually returned to the restrained position, the relative positional relationship between the swing arm 44 and the stay 18 returns to the initial state similar to that of the first embodiment. Therefore, even if the buckle 14 is manually returned to the restraining position, the effect of restricting the rotation of the latch 82 due to the lock shaft 112 coming into contact with the contact slope 120 of the contact portion 114 can be obtained.

  In each of the above embodiments, the buckle 14 is fixed to the longitudinal end of the stay 18 as a support, and the buckle 14 is moved between the restraining position and the assist position by the driving force of the motor actuator 40. Met. However, the buckle 14 is not limited to the configuration that is attached to the distal end in the longitudinal direction of the stay 18 as the support and moves between the restraining position and the assist position by the driving force of the motor actuator 40.

  For example, the stay 18, the link member 20, and the swivel arm 44 are disposed on the side where the webbing retractor is provided with respect to the seat cushion 16 (that is, opposite to the side where the buckle 14 is provided via the seat cushion 16). It is also possible to attach the anchor to the stay 18 and move the anchor between the restraining position and the assist position.

10 Seat belt device 12 Seat 14 Buckle 18 Stay (support)
20 Link member (restriction member)
24 tongue 26 webbing belt 44 swivel arm (intermediate member)
68 Long hole (hole)
82 Latch (regulation means)
112 Locking part (locking means)
160 Seat belt device

Claims (5)

A support to which a buckle for holding the tongue is attached by attaching an anchor to which the tip of the webbing belt is locked or a tongue provided on the webbing belt;
An intermediate member connected to the support body so as to be rotatable relative to the support body and displaceable in a predetermined direction relative to the support body;
Driving means for moving the intermediate member in the predetermined direction by the output driving force;
The support is connected, and the support is rotated relative to the intermediate member while restricting the movement of the support when the intermediate member is moved in the predetermined direction. A restriction that restricts movement from a restraint position where the buckle or the anchor is located on the rear end side of the seat to an assist position where the buckle or the anchor is located on the front side or the upper side of the seat with respect to the restraint position. Means,
Restricting means capable of engaging the support in a state where the support is in the restrained position, and restricting movement of the support to the assist position in an engaged state with the support;
The intermediate member is provided on the intermediate member, and engages with the restricting means in a state where the support is in the restraining position, thereby maintaining the movement restriction of the support by the restricting means, and the intermediate member with respect to the support Locking means for releasing the movement restriction by the restriction means by disengaging the restriction means by displacing in the predetermined direction;
A seat belt device comprising: A shaft portion that is integrally provided on one of the intermediate member and the support body or rotatably supports any one of the intermediate member and the support;
One of the intermediate member and the support is formed on the other side, and the shaft portion enters the inside, so that the other of the other is rotatably supported by the shaft portion, and the inner peripheral shape is the shaft portion. A hole that is larger than the outer peripheral shape of the shaft, and the shaft portion is movable in the predetermined direction on the inner side,
The seat belt device according to claim 1, wherein the intermediate member and the support body are coupled to each other.   The drive means rotates in the predetermined direction about the base end side with the driving force of the driving means, is rotatable relative to the support body, and is relative to the support body about the base end side in the predetermined direction. The seatbelt device according to claim 1 or 2, wherein the intermediate member is a revolving arm in which the support body is connected to the front end side so as to be revolving.   Centering on the base end side, it can be rotated around an axis whose axial direction is the same direction as the pivot axis direction of the pivot arm, and the distal end side is attached to the support body around an axis whose axial direction is the same direction as the pivot axis direction. 4. The seat belt device according to claim 3, wherein a link member connected to the support so as to be relatively rotatable with respect to the support member is used as the restricting means.   The seat belt device according to claim 4, further comprising an urging unit that urges the support body toward the assist position with respect to the swivel arm.

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