JP2000006697A - Rear seat back device of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear seat back device capable of demonstrating higher strength for a load to be inputted from a back surface side of a rear seat back. SOLUTION: A retractor 30 is provided on a seat back 12. A belt 31 is wound around the refractor 30. The refractor 30 is an ELR(Emergency Locking Refractor) to lock the drawing of the belt 31 when the deceleration/acceleration in the longitudinal direction is detected, or when the drawing speed of the belt 31 exceeds a specified value. A belt mechanism 61 comprises the refractor 30 and the belt 31. A connection part 50 is provided on an end part on the drawing side of the belt 31. A buckle 52 to which the connection part 50 of the belt 31 is connected in an attachable/detachable manner is provided on a rear opening/closing body 51. The connection part 50 is connected to the buckle 52 in a condition where the seat back 12 is erected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear seat back device mounted on a vehicle such as an automobile, and more particularly to a device suitable for a split-type rear seat back device.

[0002]

2. Description of the Related Art A split rear seat used in a wagon-type automobile having a luggage compartment at a rear portion of a passenger compartment has a left and right split seat back, and each seat back independently falls forward. It is a configuration that can be used. In this vehicle, one end side (the end near the door) of each seat back in the vehicle width direction is supported by a side wall portion of the vehicle body in a state where the seat back is raised. The other end of each seat back, that is, the divided portion near the center of the vehicle body is free without being supported by the vehicle body.

In this type of split-type seat back, since each seat back is cantilevered with respect to the vehicle body, the load in the luggage compartment moves forward during sudden braking or the like, and the back of the seat back (especially near the split portion) ), A moment is generated that twists the seat back frame. For this reason, there is an increasing demand for increasing the strength of the seat back frame against a load input from the back side of the seat back.

For this reason, conventionally, for example, a structure in which both ends of a metal casing of a tonneau cover that covers a luggage compartment is fixed to both side walls of the vehicle body near the rear seat back, and the upper part of the split type seat back is supported by the casing of the tonneau cover. By doing so, it has been proposed that the seat back frame is less likely to be deformed by a load input from the back side of the seat back. Alternatively, by increasing the cross-sectional area of the seatback frame itself, or by increasing the size or thickness of the hinge lock mechanism for fixing the seatback frame in the upright position, the seatback frame is less likely to be deformed. There are attempts.

[0005]

In the reinforcing means using the casing of the tonneau cover described above, it is necessary to increase the thickness of the casing in order to increase the bending strength of the casing of the tonneau cover. The weight increases considerably. Generally, the tonneau cover is
A configuration that can be removed so that it does not get in the way when loading large luggage in the luggage compartment is adopted, but when the weight of the tonneau cover increases, the tonneau cover itself is long,
Very difficult to handle. Further, in a structure in which the seat back is reinforced by using the tonneau cover, the seat back cannot be reinforced when the tonneau cover is removed.

On the other hand, in order to increase the cross-sectional area of the seat back frame, to increase the size of the hinge lock mechanism, or to increase the wall thickness, measures such as increasing the weight of the entire seat back require a large amount of seat back. No significant effect can be expected on the torsional deformation of the back frame. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a rear seat back device for a vehicle that can exhibit high strength against a load input from the rear side of the seat back.

[0007]

According to a first aspect of the present invention, there is provided a rear seat back device according to the present invention, which is developed to fulfill the above-mentioned object. Emergency Locking Retractor)
The belt is pulled out from the belt, and the connecting portion at the tip is connected to a locking portion such as a buckle provided on the rear opening / closing body or the like.

In the state where the belt is stretched in the front-rear direction in the luggage compartment, when a deceleration which acts on the vehicle such that the luggage in the luggage compartment moves forward, such as during sudden braking, acts on the retractor (similar to the seat belt). With the emergency lock function of the ELR), the belt drawer is instantaneously locked. Therefore, even if a load is input from the back side due to a collision of a load with the back of the seat back or the like, the load is supported by the rear opening / closing body via the belt. As a result, the deformation of the seat back frame is suppressed, and in particular, the deformation behavior in which the split-type seat back frame is twisted can be effectively suppressed.

When it is necessary to tilt the seat back forward, such as when loading a long baggage in the luggage compartment, the connecting portion of the belt is removed from the engaging portion such as a buckle and the belt is fully wound by the retractor. You only have to knock down the seat back while taking it, and the belt does not get in the way.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. A vehicle rear seat 10 shown in FIG. 1 is a seat cushion 1 fixed to a floor of a passenger compartment.
1 and a rear seat back device 13 including a seat back 12 provided at a rear portion of the seat cushion 11. The interior space of the rear of the seat back 12 is used as a luggage compartment 14. Reference numeral W indicates a load placed on the floor 14a of the luggage compartment 14.

As shown in FIG. 2, the seat back 12 is composed of two divided seat back bodies 12a and 12b. These divided seat back bodies 12a,
Reference numeral 12b designates a front side, that is, 2 in FIG. 1 around a pivot 15 of the hinge mechanism (only a part of which is shown in FIG. 1).
The seat cushion 11 can be tilted to a position overlapping the upper surface side of the seat cushion 11 as shown by a chain line F.

[0012] As shown in FIG.
Each of a and 12b has a seat back fixing mechanism 20 on one side (end near the vehicle body side wall). The seat back fixing mechanism 20 includes a lock member 22 that can be engaged with a stopper member 21 provided on the vehicle body, and an operation element 23 for operating the lock member 22.

The lock member 22 is a part of the divided seat back body 1.
By engaging with the stopper member 21 in a state where the divided seat back members 2a and 12b are raised, the divided seat back body 12
a and 12b are fixed to the vehicle body. The lock member 22 separates from the stopper member 21 when the operator 23 is operated in the unlocking direction, thereby enabling the divided seat back bodies 12a and 12b to fall forward.

A retractor 30 is provided on the divided seat back bodies 12a and 12b. As shown in FIG. 3, the retractor 30 has a function of winding the belt 31 by an elastic force of a spiral spring (not shown) or the like, and can pull out the belt 31. This retractor 30 is an ELR used for a seat belt or the like.
Similarly to the (Emergency Locking Retractor), a sensor lock mechanism 32 that locks the belt 31 when the longitudinal acceleration is detected or when the belt 31 withdrawal speed exceeds a predetermined value is provided.

As shown in FIG. 3, the retractor 30 is fixed to a horizontal member 40a of the seat back frame 40 by a bolt 41 or the like. In the vicinity of the retractor 30, a roller 42 is provided as an example of a guide unit for guiding the winding and drawing of the belt 31.
The belt 31 is made of a material having a high tensile strength similar to webbing used for a seat belt or the like.

A connecting portion 50 is connected to the end of the belt 31 on the drawing side.
Is provided. Tongues and the like similar to the seat belt attaching / detaching mechanism are used for the connecting portion 50. Connection part 5
0 is the back door (rear gate) installed at the rear of the vehicle
5 as a locking portion provided on the rear opening / closing body 51
2 and is detachably connected to the buckle 52. The buckle 52 has a connecting portion (a tongue fitting) 50 similarly to the seat belt buckle.
And a release button 60 as an operation element used when releasing the latch member.

The buckle 52 is fixed to a closed section having high bending rigidity, which is composed of an outer panel 51a and an inner panel 51b which constitute the rear opening / closing body 51. The connecting portion 50 connected to the buckle 52 includes a release button 60
By performing a release operation such as pressing the buckle 5
2 can be removed. The retractor 30, the belt 31, the buckle 52 and the like constitute a belt mechanism 61 according to the present invention.

As shown in FIG. 1, the divided seat back body 12
When one or both of a and 12b are standing, the connecting portion 50 of the belt 31 is inserted into the buckle 52 to connect the two. For example, as shown in FIG.
0 is connected to the buckle 52. In this state, the rear opening / closing body 5
When the belt 1 is closed, an extra length of the belt 31 is wound up by the retractor 30, and the belt 31 is stretched between the upper portion of the seat back 12 and the rear opening / closing body 51 in the front-rear direction with a suitable tension. It is. Since the belt 31 is narrower than a tonneau cover or the like, luggage that is taller than the height of the belt 31 can be stored in the luggage compartment 14 without any problem.

When the rear opening / closing body 51 is opened with the belt 31 stretched over the luggage compartment 14 as described above, the belt 31 is pulled out from the retractor 30. At this time, the belt 31
If the pulling speed of the belt 31 is too high, the belt 31 may be locked by the operation of the sensor lock mechanism 32 of the retractor 30.

However, since the connecting portion 50 of the belt 31 is connected to the buckle 52 at the intermediate portion in the vertical direction of the rear opening / closing body 51, the distance change from the retractor 30 to the buckle 52 when the rear opening / closing body 51 is opened. Since a damper 65 (shown in FIG. 4) is provided between the rear opening and closing body 51 and the vehicle body to suppress a sudden opening between the rear opening and closing body 51 and the vehicle body, the belt 31 when the rear opening and closing body 51 is opened is provided. Is relatively slow. Therefore, the belt 31 is not locked by the retractor 30 when the rear opening / closing body 51 is opened.

When the belt 31 is stretched between the seat back 12 and the rear opening / closing body 51, the load W in the luggage compartment 14 moves forward such as during sudden braking or a frontal collision, causing the seat back 12 to move. When a deceleration that acts like knocking forward is applied,
The pull-out of the belt 31 is instantaneously locked by the locking function of the retractor 30, that is, the ELR. In this case, the divided seat back body 12a including the belt mechanism 61
One end of the vehicle width direction (the end near the center of the vehicle body) is supported by the rear opening / closing body 51 by the belt 31, and the other end of the seat back body 12a (the end near the vehicle body side wall) is seat back. It is supported by the vehicle body by the fixing mechanism 20.

That is, since the divided seat back body 12a has a two-sided support form in which both ends are supported, the back of the divided seat back body 12a is hit by a load W or the like, so that the back of the divided seat back body 12a is Even if a large load is input, the deformation of the seat back frame 40 is sufficiently suppressed, and in particular, the deformation behavior such that the seat back frame 40 is twisted with respect to the load applied near the divided portion of the divided seat back body 12a is sufficiently suppressed. can do.

The rear seat back device 13 of this embodiment
In the case where at least one of the divided seat back bodies 12a and 12b needs to be tilted forward, such as when carrying a large load or a long load, the belt 31 is operated by operating the release button 60 of the buckle 52.
2 is detached from the buckle 41, so that FIG.
Alternatively, as shown in FIG.
One or both of 12b can be defeated.

In the above embodiment, the retractor 30 is provided on the side of the seat back 12 and the buckle 52 is provided on the rear opening / closing body 51. However, in the present invention, the retractor 30 is provided on the rear opening / closing body 51 and the buckle 52 is provided on the seat back. It may be provided on the 12 side. In the above-described embodiment, the belt mechanisms 6 are respectively attached to the divided seat back bodies 12a and 12b.
However, in implementing the present invention, if the belt mechanism 61 is provided on one of the divided seat back bodies 12a and 12b, the intended object of the present invention can be achieved in one of the divided seat back bodies. For example, the number of belt mechanisms, the position of the belt mechanisms, and the like may be appropriately selected according to the form of the divided seat back body and the luggage compartment. Further, the shapes of the retractor 30, the connecting portion 50, the locking portion (buckle 52), and the like constituting the belt mechanism 61 are not limited to the above-described embodiment.

The rear seat back device 13 of the above embodiment
May be applied to a rear seat with a reclining mechanism that can change the inclination of the seat back 12. When the present invention is applied to a rear seat with a reclining mechanism, the rear seat back device 13 of the above embodiment only changes the amount of pulling out of the belt 31 even if the inclination of the seat back 12 changes. Therefore, it can be applied to a rear seat back with a reclining mechanism without any problem.

[0026]

According to the rear seat back device of the present invention, when the load in the luggage compartment moves forward during sudden braking or the like, an input from the back side of the seat back is provided. The displacement of the frame can be suppressed by the belt mechanism. This belt mechanism does not restrain the rear opening and closing body when opening and closing the rear opening and closing body. The present invention can be applied to a rear seat back with a reclining mechanism without any problem, and can be used with or without a tonneau cover.

[Brief description of the drawings]

FIG. 1 is a side view of a rear seat back device showing one embodiment of the present invention.

FIG. 2 is a perspective view of the rear seat back device shown in FIG. 1 in a state where one of the divided seat back bodies is folded down.

FIG. 3 is a perspective view showing a seat back frame and a belt mechanism of the rear seat back device.

FIG. 4 is a side view showing an example of a usage form of the rear seat back device.

FIG. 5 is a perspective view of the rear seat back device in a state where a divided seat back body is folded down, as viewed from a cargo room side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Rear seat for vehicles 12 ... Seat back 13 ... Rear seat back device 14 ... Luggage compartment 30 ... Retractor 31 ... Belt 40 ... Seat back frame 50 ... Connecting part 51 ... Rear opening / closing body 52 ... Buckle (locking part) 61 ... Belt mechanism

Claims (1)

[Claims] 1. A rear seat back device having a seat back which can be tilted forward and having a luggage compartment behind the seat back, comprising: a retractor provided on one of the seat back and a rear opening / closing body at a rear part of a vehicle body; The retractor has a belt wound around the retractor and locks the belt when the longitudinal deceleration of the vehicle is detected or when the belt withdrawal speed exceeds a predetermined value.
A belt mechanism using an LR; and a locking portion provided on one of the seat back and the rear opening / closing body and a connection portion of a pull-out end of the belt connected detachably. A rear seat back device for a vehicle.