JP2921111B2 - Belt integrated seat for vehicle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle belt integrated seat in which a seat belt retractor is incorporated in a seat back.

2. Description of the Related Art As a seat belt retractor (belt take-up device), an emergency lock retractor (ELR) that automatically locks and tightens a belt when an acceleration exceeding a predetermined value acts on a vehicle is called. Types are commonly used. In the ELR, an inertial element such as a pendulum is often used as an acceleration detection sensor.If the inertial element is tilted with respect to the retractor body by more than a set angle, the retractor automatically locks and the passenger When trying to fall to the left or right, they are nervous to ensure safety.

By the way, in a vehicle seat, a seatback is often reclined and a seat cushion is made movable in a forward and backward direction so that a passenger can easily take a desired posture. In this case, if the retractor that attaches the end of the seatbelt is mounted on a part that is immovable with respect to the vehicle body, such as the center pillar of the vehicle body or the floor, the seatbelt may be mounted depending on the inclination of the seatback and the front and rear position of the seat May not be in a state appropriate for the elderly. Therefore, if the retractor is provided integrally with the seat back, it is possible to always maintain an appropriate belt state for the occupant regardless of the reclining angle of the seat back or the sliding position of the seat.

However, in the ELR, as described above, the inertial element supported by the retractor is used as the acceleration sensor, and the belt is locked by changing the angle with respect to the retractor.Therefore, even when the seat back reclines, the ELR is used. Of the vehicle with respect to the vehicle body must not change.

As means therefor, Japanese Patent Laid-Open No. 60-92945 discloses that a locking claw that moves via a Bowden cable in association with a reclining angle of a seat back is rotatably mounted on a horizontal shaft provided on the seat back. There has been proposed a configuration in which the retractor is held in a predetermined posture with respect to a vehicle body by engaging with teeth of a ratchet wheel fixed to a supported retractor.

However, in this device, since the locking pawl is engaged with the teeth of the ratchet wheel to maintain the position of the retractor, the position can only follow the inclination of the seat back only stepwise. According to the drawings attached to the publication, the pitch of the teeth of the ratchet wheel is about 10 °, and this technology can be applied to the ELR when the seat back reclines continuously. It cannot be applied to the case where the seat back is inclined at the same angular pitch as the pitch of the teeth of the ratchet wheel.

Also, when the ratchet wheel and the locking claw are not engaged, the retractor is swingable around the horizontal shaft, so that the seat back is quickly turned upside down or the vehicle body is impacted. In such a case, the teeth and the locking claws may be engaged at different positions, and the ELR may not operate normally.

SUMMARY OF THE INVENTION In view of the above-described problems of the above-described devices conventionally proposed for the ELR provided on the belt-integrated seat, the present invention accurately follows the inclination of the seat back steplessly and steplessly. To provide a belt-integrated seat having an ELR that can always hold the retractor in a predetermined position with respect to the vehicle body, the inertial element is always held in the predetermined position with respect to the retractor, and operates accurately in an emergency. Make it an issue.

Means for Solving the Problems In order to solve the above-mentioned problems, the vehicle integrated belt seat of the present invention has a retractor fixed to a horizontal shaft rotatably supported on a frame of a seat back so as to be rotatable around a horizontal axis. When the seat back is tilted, the mechanism has an interlocking mechanism for continuously changing the angle of rotation of the horizontal shaft with respect to the seat back so as to follow the change in the tilt angle of the seat back so that the rotation angle is always the same and in the opposite direction. It is characterized by the following.

According to the configuration described above, when the inclination angle of the seat back is considered, the rotation angle of the horizontal shaft with respect to the seat back changes steplessly in the opposite direction at the same angle as the inclination angle of the seat back. Therefore, the rotation angle position of the horizontal shaft with respect to the vehicle main body is maintained at a predetermined position without any step, and the posture of the retractor fixed thereto at the vehicle main body is also maintained at the predetermined posture. Therefore, the posture of the inertial element with respect to the retractor is normally maintained, and the ELR
Works correctly in an emergency.

Examples Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing the overall schematic structure of a vehicle seat to which the present invention is applied, FIG. 2 is a side view of the vicinity of the upper end of the seat back as viewed in the direction of arrow A in FIG. 1, and FIG. It is a front view of the retractor part before leaning backward.

The seat 1 includes a seat cushion 2 and a seat back 3. The seat adjuster 4 of the seat cushion 2 includes a gear integrated handle 5 with a reverse rotation prevention mechanism,
The gear 6 and a gear 7 integrally formed therewith are rotatably supported, and the gear of the gear integrated handle 5 and the gear 6 are linked by a chain 8. A gear 9 and a gear 10 integrally formed therewith are rotatably supported by a pin 12 erected on a bracket 11 provided near the upper end of the seat back 3. The bracket 11
A horizontal shaft 14 in which a gear 13 meshing with 10 is fixed at one end is rotatably supported. A retractor 15 rotates integrally with the horizontal shaft 14 and is fixed by an e-ring 16 so as not to shift in the axial direction. Further, the shaft 14 is restrained in the axial direction by an e-ring 17 with respect to the bracket 11. . An inertia element 18 is swingably attached to the lower end of the retractor 15.

A chain 19 is hung between the gear 9 of the seat back 3 and the gear 7 of the seat cushion 2 such that the retractor 15 maintains a vertical posture when the seat back 3 is at the reference position.

The gear ratio from the gear-integrated handle 5 to the gear 13 is set such that the rotation angle of the shaft 14 is the same angle as the inclination angle of the seat back by the operation of the gear-integrated handle and is in the opposite direction.

Since this device is configured as described above, in order to change the inclination of the seat back 3, when the gear integrated handle 5 of the seat cushion 2 is rotated clockwise, for example, as shown by an arrow in FIG. The gears 6 and 7 rotate clockwise through the chain 8, and at the same time, the seat adjuster 4 operates, and the seat back tilts backward. The clockwise rotation of the gear 7 causes the gear 9 and the integrally formed gear 10 to rotate clockwise as shown in FIG. 2 via the chain 19. The clockwise rotation of the gear 10 causes the gear 13 meshing therewith to rotate counterclockwise, and the horizontal shaft 14 fixed to the gear 13 and the retractor 15 integrally attached thereto rotate counterclockwise. I do. The rotation angle of the retractor 15 is the same as, but opposite to, the rotation angle of the seat back 3 that is tilted backward by the rotation of the gear integrated handle 5.
Therefore, as shown in FIG. 4, the rotation angle of the retractor 15 with respect to the vehicle body is always zero, and the attitude of the inertial element 18 with respect to the retractor 15 is maintained as predetermined.

Effect As described above, according to the present invention, when the seat back is tilted with a simple configuration, the retractor is continuously and continuously rotated by the same angle in the reverse direction to cancel out when the seat back is tilted. Thus, the retractor can be always maintained at a predetermined posture with respect to the vehicle body. As a result, the ELR can always be operated accurately, and the effect of ensuring safety can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a vehicle belt-integrated seat to which the present invention is applied, FIG. 2 is a side view of a retractor portion near the upper end of the seat back before a seat back is tilted backward, and FIG. FIG. 4 is a side view of the retractor unit after the seat back has been tilted backward. DESCRIPTION OF SYMBOLS 1 ... Seat 2 ... Seat cushion 3 ... Seat back 4 ... Seat adjuster 5 ... Gear integrated handle 6,7,9,10,13 ... Gear 8,19 ... Chain 11 ... Bracket 12 ... Pin 14 Horizontal shaft 15 Retractor 18 Inertial element

Claims (1)

(57) [Claims] 1. A vehicle belt integrated seat in which a retractor for a seat belt is incorporated in a seat back, and the retractor is automatically locked by an inclination angle of the inertial element swingably supported by the retractor with respect to the retractor. A horizontal shaft rotatably supported about a horizontal axis with respect to the frame and having the retractor fixed thereto, and when the seat back is inclined, the inclination angle of the seat back and the rotation of the horizontal shaft with respect to the seat back. An interlocking mechanism that interlocks steplessly so that the moving angle is always the same and in the opposite direction, wherein the interlocking mechanism operates a seat adjuster supported by a frame of the seat cushion; A first gear unit supported on the frame side, and a first gear unit supported on the frame side of the seat back; A second gear device, a third gear device supported on the horizontal shaft and meshing with the second gear device, and a power transmission mechanism for transmitting the rotational movement of the gear integrated handle to the third gear device. A belt integrated seat for a vehicle, characterized in that: