JP2008296659A - Seat back locking device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat back locking device for a vehicle, capable of more certainly keeping the locked state of a seat back in a seated posture position. <P>SOLUTION: This seat back locking device 20 for the vehicle keeps the seat back 10 in the seated posture position by rotating a lock plate 25 around a rotating shaft 28 and engaging the lock plate 25 with a lock pin 21. The position G of the center of gravity of the lock plate 25 is positioned lower than the shaft center position of the rotating shaft 28. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle seat back locking device.

2. Description of the Related Art Conventionally, there is known a vehicle seat back locking device that is provided on a seat having a foldable seat back that partitions a cargo compartment at the rear of the vehicle and a passenger compartment at the front of the cargo compartment, and locks the seat back at a seating posture position. (For example, refer to Patent Document 1). In this vehicle seat back locking device, the seat back is held at the seating posture position by rotating the latch plate and engaging with the striker.
JP 2002-337581 A

  However, in a conventional vehicle seat back locking device, for example, when a sudden brake is applied or a vehicle collides with the front, the load loaded in the luggage compartment moves to the passenger compartment due to inertial force. Due to the impact when the vehicle collides with the seat back, the latch plate rotates in the unlocking direction and the seat back is unlocked, and there is a possibility that the luggage in the luggage compartment jumps out to the cabin.

  The present invention has been made in view of this point, and an object of the present invention is to provide a vehicle seat back locking device that can more reliably maintain the locked state of the seat back in the seating posture position. is there.

  In order to achieve the above-described object, the present invention appropriately sets the position of the center of gravity of the lock plate that engages with the lock pin.

  Specifically, the present invention provides a vehicle seat back that is provided in a seat having a foldable seat back that partitions a cargo compartment at the rear of the vehicle and a passenger compartment in front of the cargo compartment, and locks the seat back at a seating posture position. The following solutions were taken for the locking device.

That is, the invention of claim 1 includes a lock pin extending in the vehicle width direction,
A lock plate formed with an engagement hook for engaging with the lock pin;
A rotation shaft that extends parallel to the lock pin and rotatably supports the lock plate;
The lock plate is rotated about the rotation shaft, and the lock plate is switched between a lock operation position where the lock plate is engaged with the lock pin and a lock release position where the engagement between the lock plate and the lock pin is released. With a lock lever,
The position of the center of gravity of the lock plate is located below the center position of the rotation shaft.

The invention of claim 2 is the invention according to claim 1,
A counterweight for adjusting the position of the center of gravity of the lock plate is attached below the rotation shaft of the lock plate.

The invention of claim 3 is the invention according to claim 1 or 2,
The lock plate is configured to be positioned at a lock operation position by rotating upward from the front of the vehicle toward the rear of the vehicle around the rotation axis,
The center of gravity of the lock plate is located behind the vehicle relative to the center of the pivot shaft.

The invention of claim 4 is any one of claims 1 to 3,
The plate thickness of the lock plate above the pivot shaft is formed thinner than the plate thickness below the pivot shaft.

  According to the first aspect of the present invention, since the center of gravity of the lock plate is located below the center of the rotation shaft, when the vehicle is suddenly braked or the vehicle collides with the front, Suppresses the lock plate from rotating in the unlocking direction due to the impact when the luggage collides with the seat back even when the luggage loaded in the cargo compartment moves to the cabin due to inertial force. This is advantageous. Thereby, the locked state in the seating posture position of the seat back can be more reliably maintained, and the luggage in the cargo compartment does not exceed the seat back, so that the safety of the passengers in the cabin can be ensured.

  According to the second aspect of the present invention, since the counterweight for adjusting the position of the center of gravity of the lock plate is attached below the rotation axis of the lock plate, the shape and weight of the counterweight can be set as appropriate. The center of gravity of the entire lock plate can be arbitrarily changed, and the lock plate can be prevented from rotating even if the load in the luggage compartment collides with the seat back.

  According to the invention of claim 3, since the center of gravity of the lock plate is located behind the vehicle with respect to the center of the rotation shaft, the lock plate can be rotated even if the load in the luggage compartment collides with the seat back. It is advantageous in suppressing the above. In other words, the lock plate is positioned at the lock operation position by rotating upward from the front of the vehicle toward the rear of the vehicle around the rotation axis, so that the weight of the lock plate on the rear side of the vehicle is increased. Then, the lock plate continues to be urged in the lock operation direction by its own weight. Therefore, it becomes difficult for the lock plate to turn in the unlocking direction from the rear of the vehicle toward the front of the vehicle, which is advantageous in suppressing unintentional rotation of the lock plate.

  According to the fourth aspect of the present invention, since the upper plate thickness of the lock plate is thinner than the lower plate thickness, the center of gravity position can be reliably rotated while making the entire lock plate compact. It can be positioned below the center, and the locked state of the seat back in the seating posture position can be more reliably maintained while saving the space for accommodating the lock plate.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a side view showing a configuration of a vehicle equipped with a vehicle seat back locking device according to an embodiment of the present invention. As shown in FIG. 1, this vehicle 1 is provided with a passenger compartment 4 having a luggage compartment 2 on the rear side and a driver's seat 3 on the front side thereof. A hatch back door 5 is attached to the rear edge of the roof of the vehicle 1 by a gas stay 6 so as to be rotatable in the vertical direction.

  The luggage compartment 2 and the passenger compartment 4 are partitioned by a seat back 10 of a bench seat 7 placed behind the driver's seat 3. The seat back 10 is configured to be foldable, and it is also possible to fold up and fold up together with the seat cushion 8 extending in the vehicle width direction (indicated by a two-dot chain line in FIG. 1). The floor plate 9 of the vehicle 1 is provided with a pedestal 11 on which the bench seat 7 is placed.

  The seat cushion 8 is provided with a reinforcing seat frame 31 (see FIG. 2 described later) extending in the vehicle width direction, and seat brackets 32 are attached to both ends of the seat frame 31. The seat back 10 is rotatably supported with respect to the seat bracket 32 by a seat rotation shaft 16 (see FIG. 2).

  FIG. 2 is a side sectional view showing the configuration of the vehicle seat back locking device of the present invention, and FIG. 3 is a view taken in the direction of arrow A in FIG. As shown in FIGS. 2 and 3, the vehicle seat back locking device 20 includes a lock pin 21 that extends from the side of the seat back 10 in the vehicle width direction, and an engagement hook 25 a that engages with the lock pin 21. The formed lock plate 25, a rotation shaft 28 extending in parallel with the lock pin 21 and rotatably supporting the lock plate 25, the lock plate 25 being rotated about the rotation shaft 28, and the lock plate 25 being rotated. Is provided with a lock lever 35 for switching between a lock operation position for engaging the lock pin 21 and a lock release position for releasing the engagement between the lock plate 25 and the lock pin 21.

  An engagement hook 25a is formed at the front end of the lock plate 25, and one end of a biasing spring 33 is attached to the rear end. The other end of the urging spring 33 is locked to the spring locking portion 34. The urging spring 33 urges the lock plate 25 to rotate upward about the rotation shaft 28 from the front of the vehicle toward the rear of the vehicle so that the lock plate 25 is positioned at the lock operating position. .

  Further, the rotation shaft 28 is provided with a lock stopper 27 that contacts the lock pin 21 when the seat back 10 is positioned at the seating posture position, and the seat back 10 is centered on the seat rotation shaft 16. When the seat back 10 is rotated to the seating posture position, the lock pin 21 of the seat back 10 abuts against the lock stopper 27 and does not further rotate, so that the seat back 10 is held at the seating posture position.

  Then, the lock pin 21 is held between the lock plate 25 and the lock stopper 27 by engaging the engagement hook 25 a of the lock plate 25 with the lock pin 21 while the lock pin 21 is in contact with the lock stopper 27. Thus, the seat back 10 is securely held at the sitting posture position.

  A counterweight 26 is attached below the rotation shaft 28 of the lock plate 25. The counter weight 26 is a weight for adjusting the center of gravity position G of the entire lock plate 25, and the center of gravity position G of the entire lock plate 25 including the counter weight 26 is set by appropriately setting the shape and weight of the counter weight 26. Can be changed arbitrarily. In the example shown in FIG. 2, the center of gravity G of the entire lock plate 25 is set to be located below the center of the rotation shaft 28 and behind the vehicle.

  As a result, even when the brake is suddenly applied or when the vehicle 1 collides with the front, the luggage loaded in the luggage compartment 2 moves to the passenger compartment 4 side due to the inertial force, so that the luggage is placed on the seat back 10. This is advantageous in suppressing the lock plate 25 from rotating in the unlocking direction due to an impact at the time of collision. Thereby, the locked state in the seating posture position of the seat back 10 can be more reliably maintained, and the luggage in the luggage compartment 2 does not exceed the seat back 10, so that the safety of passengers in the passenger compartment 4 is ensured. can do.

  In addition, since the center of gravity G of the lock plate 25 is located behind the vehicle with respect to the axis of the rotation shaft 28, the lock plate 25 can be rotated even if the load in the luggage compartment 2 collides with the seat back 10. This is advantageous in terms of suppression. That is, the lock plate 25 is positioned at the lock operation position by rotating upward from the front of the vehicle toward the rear of the vehicle about the rotation shaft 28. If the weight is increased, the lock plate 25 is continuously urged in the lock operation direction by its own weight. Therefore, it becomes difficult for the lock plate 25 to rotate in the unlocking direction from the rear of the vehicle toward the front of the vehicle, which is advantageous in suppressing unintentional rotation of the lock plate 25.

  Further, the plate thickness above the rotation shaft 28 of the lock plate 25 is formed to be thinner than the plate thickness at the bottom (that is, the plate thickness of the counterweight 26). As a result, the lock plate 25 is accommodated in a slight gap between the seat bracket 32 and the seat back 10, and the center of gravity position G is reliably set below the axial center position of the rotary shaft 28 while making the lock plate 25 compact. Can be positioned.

  The shape of the counterweight 26 is not limited to the shape illustrated in FIG. 2, and various shapes can be considered depending on the accommodation space and the center of gravity position to be set.

  FIG. 4 is a side view showing a state in which the lock of the vehicle seat back locking device is released and the seat back is folded. As shown in FIG. 4, first, the lock lever 35 is pulled forward, and the engagement between the engagement hook 25 a of the lock plate 25 and the lock pin 21 is released against the urging force of the urging spring 33. Then, the seat back 10 is rotated around the seat rotation shaft 16 so that the bench seat 7 including the seat back 10 is folded.

  As described above, according to the vehicle seat back locking device 20 according to the embodiment of the present invention, the gravity center position G of the lock plate 25 is located below the axial center position of the rotation shaft 28. When the luggage collides with the seat back 10 even when the brakes are suddenly applied or when the vehicle 1 collides with the front, even if the luggage loaded in the luggage compartment 2 moves to the cabin 4 due to inertial force. This is advantageous in preventing the lock plate 25 from rotating in the unlocking direction due to the impact of the above. Thereby, the locked state in the seating posture position of the seat back 10 can be more reliably maintained, and the luggage in the luggage compartment 2 does not exceed the seat back 10, so that the safety of passengers in the passenger compartment 4 is ensured. can do.

  As described above, the present invention provides a highly practical effect of providing a vehicle seat back locking device that can more reliably maintain the locked state of the seat back in the seating posture position. Therefore, it is extremely useful and has high industrial applicability.

1 is a side view showing a configuration of a vehicle equipped with a vehicle seat back locking device according to an embodiment of the present invention. It is side surface sectional drawing which shows the structure of the locking device of a vehicle seat back. FIG. 3 is a view taken in the direction of arrow A in FIG. 2. It is a side view which shows the state which released the lock | rock of the locking device of the vehicle seat back, and folded the seat back.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Cargo compartment 4 Guest room 10 Seat back 20 Lock device 21 Lock pin 25 Lock plate 25a Engagement hook 26 Counterweight 28 Rotating shaft 35 Lock lever

Claims (4)

A vehicle seat back locking device that is provided on a seat having a foldable seat back that partitions a cargo compartment at the rear of the vehicle and a passenger compartment at the front of the cargo compartment, and locks the seat back at a seating posture position,
A lock pin attached to the seat back and extending in the vehicle width direction;
A lock plate formed with an engagement hook for engaging with the lock pin;
A rotation shaft that extends parallel to the lock pin and rotatably supports the lock plate;
The lock plate is rotated about the rotation shaft, and the lock plate is switched between a lock operation position where the lock plate is engaged with the lock pin and a lock release position where the engagement between the lock plate and the lock pin is released. With a lock lever,
The vehicle seat back locking device according to claim 1, wherein the center of gravity of the lock plate is positioned below the center of the rotation shaft. In claim 1,
A lock device for a vehicle seat back, wherein a counterweight for adjusting the position of the center of gravity of the lock plate is attached below the rotation shaft of the lock plate. In claim 1 or 2,
The lock plate is configured to be positioned at a lock operation position by rotating upward from the front of the vehicle toward the rear of the vehicle around the rotation axis,
The vehicle seat back locking device according to claim 1, wherein the center of gravity of the lock plate is located rearward of the center of the rotation shaft. In any one of Claims 1 thru | or 3,
A locking device for a vehicle seat back, wherein a thickness of an upper portion of the lock plate above the rotating shaft is formed thinner than a thickness of a lower portion of the rotating shaft.

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