JPS6047134B2 - Emergency lock device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an emergency locking device used in a seat belt device to reliably lock occupant restraint webbing in the event of a vehicle emergency.

A seat belt device has been proposed that automatically attaches restraint webbing to the occupant after the occupant is seated.

This seatbelt device guides a slider to a guide rail laid along the vehicle body to make it movable.The outer end of the webbing is attached to the slider and the slider is driven along the guide rail.
The outer end portion is brought into contact with and separated from the passenger seat, and the webbing is attached to and removed from the seated occupant. In this automatic mounting type seat belt device, it is necessary that the slider is reliably latched to the vehicle body at the automatic mounting position where the slider moves toward the passenger seat along the guide rail. That is, in an emergency such as a vehicle collision or overturning, the collision inertia of the occupant generates a large tension in the webbing, so it is necessary to ensure that this tension is supported by the vehicle body so that the webbing can securely restrain the occupant. SUMMARY OF THE INVENTION In view of the above facts, it is an object of the present invention to provide an emergency locking device with a simple structure that reliably prevents the slider from moving in the event of a vehicle emergency and maintains the restraint of the occupant.

The emergency locking device according to the present invention locks the occupant restraining webbing to a slider whose sliding part in the groove is slidably supported by the guide groove of the guide rail, and locks the occupant restraining webbing in an emergency. A shoe that breaks due to tension is provided on the sliding part in the groove to facilitate normal sliding, and when the shoe breaks, the slider is locked by the frictional force between the sliding part in the groove and the inner surface of the guide groove. It is something to do.

Embodiments of the present invention will be described below with reference to the drawings.

In the present embodiment shown in FIG. 1, the occupant restraint webbing 10 is attached to the occupant 14 seated on the occupant seat 12 while obliquely surrounding the occupant. The inner end portion 16 of this webbing 10 is wound up on a winding device 20 attached to a floor member 18 at a substantially central portion of the vehicle. This winding device 20 uses a biasing force to move the webbing 1
An inner shear lock mechanism is built in to wind up the webbing and abruptly stop the unwinding of the webbing in case of a vehicle emergency. On the other hand, the outer end 22 of the webbing 10 is
As shown in the figure, it is folded back at the anchor plate 24 and then sewn and secured to the anchor plate 24.

This anchor plate 24 is attached to a bolt 28 to a slider 26.
It is rotatably mounted. The slider 26 is guided by a guide groove 32 having a rectangular cross section that is bored along the longitudinal direction of the guide rail 30, and is movable in the longitudinal direction of the guide rail 30.

The center part of the guide rail 30 is located at the roof side 3 of the vehicle.
4, and the front end portion 36 is lowered along the front pillar 38 of the vehicle. Further, the vertical portion 40 at the rear end is bent at a substantially right angle from the center portion and then hangs down along the center pillar 42 of the vehicle. When the slider 26 and the anchor plate 24 reach the lower end of the vertical portion 40 as shown by the solid line in FIG. When the slider 26 reaches the front end 36 of the guide rail 30, the webbing 10 is moved away from the passenger seat 12 and toward the front of the vehicle, as shown by the two-dot chain line in FIG. 1, to form a space for the passenger to get in and out. It is designed so that it can be placed in a position where it can be removed.
Attachment of the slider 26 to this guide rail 30 is as follows:
As shown in FIG. 4, one end of the slider 26 is an enlarged part 44 wider than the middle part. This enlarged portion 44
A flat head 46 protrudes from one end in the thickness direction.

The width of this flat head 46 is determined by the width of the guide groove 3 as shown in FIG.
The width of the groove is slightly smaller than that of No. 2. Further, a pair of shear pins 48 pass through the other end of the enlarged portion 44 in the thickness direction of the slider 26.

The enlarged portion 44 also encloses the flat head 46 and the shear pin 48 as shown by the two-dot chain line in FIG.
A flat shoe 50 larger than the slider 26 is integrally molded with the slider 26. As shown in FIG. 3, the width of the shoe 50 is approximately equal to the width of the guide groove 32, and when the slider 26 moves along the guide rail 30 (in the direction of arrow A), It is designed to reduce the frictional force that occurs. These enlarged portions 44
, the guide groove 3 by the shear pin 48 and the shoe 50.
The guide groove 32 has a flat shape that is long in the extending direction of the guide groove 32.
An in-groove sliding portion S that can smoothly slide inside the groove is formed.

As shown in FIG. 2, the slider 26 has a flat head 46 and a shoe 50, that is, the sliding portion S in the groove is restrained by the neck portion 52 of the guide groove 32, so that the enlarged portion 44 engages with the stopper pin 51. This prevents the webbing 10 from being pulled out of the guide groove 32 even if tension is applied to the webbing 10.

In this case, the tension of the webbing 10 transmitted to the slider 26 is in the direction in which the flat head 46 is pulled out from the shoe 50 (second
However, if the occupant wearing the webbing 10 behaves normally inside the car, the shoe 50 will not be destroyed, and in an emergency situation such as a vehicle collision, the shoe 50 will not be destroyed by the inertial force of the occupant 14. When the resulting tension of the webbing 10 is applied, the strength is such that the shear pin 48 is sheared and the shoe 50 is destroyed. Due to this destruction, the shoe 50 is separated from the head 46, and the occupant restraining webbing is 1
A reaction force from the inner surface of the guide groove 32 that balances the moment generated in the slider 26 due to zero tension will be generated at both ends of the head 46.

Frictional force caused by this reaction force moves the slider 26 toward the guide groove 32.
The length of the head 46 is set so that it is high enough to lock inside. On the other hand, the length of the shoe 50 is set to extend the length of the head 46 so that this frictional force is small enough not to inhibit the sliding of the slider 26 within the guide groove 32. As shown in FIG. 2, the guide rail 30 has a tape groove 54 that is continuous with the guide groove 32 through its neck 52 and is bored along its length, in which a flexible tape 56 is accommodated. .

This tape 56 has a large number of openings 58 perforated along the longitudinal direction, and by inserting the intermediate portion of the slider 26 into one of the openings 58 via a guide shoe 59, the slider 26 is inserted into the tape. 56.
As shown in FIG. 1, this tape 56 is guided in an auxiliary slide rail 60 that is lowered from the lower end of the vertical section 40 along the center pillar, and the lower end of the auxiliary slide rail 60 is located below the center pillar 42. The sprocket housing 62 is guided into the sprocket housing 62 by communicating with the sprocket housing 62 attached to the sprocket housing 62 . A sprocket (not shown) is pivotally supported within the sprocket housing 62, and a tape 56 is attached to the sprocket.
The openings 58 of the two are engaged with each other. The sprocket in this sprocket housing 62 is driven by a motor 64 attached to the center pillar 42.
The motor 64 detects the seating state of the occupant and moves the tape 56 along the guide rail 30.
As an example, the motor 64 is configured to move the anchor plate 24 toward the uninstallation position when the occupant opens the door, and to move the anchor plate 24 toward the automatic installation position when the door is closed. It's getting old. In this embodiment configured as described above, when the passenger opens the door to exit the vehicle, the motor 64 simultaneously drives the tape 56, so the slider 26 moves toward the guide rail 30.
The webbing 10 is moved to the release position as shown by the two-dot chain line in FIG.

Therefore, the occupant can easily get off the vehicle, and when the passenger closes the door after re-entering the vehicle, the motor 64 rotates in reverse to move the slider 2 along the guide rail 30 toward the automatic mounting position. In this state, the occupant can automatically put on the webbing 10 as shown by the solid line in FIG. 1.

In addition, if the vehicle is in an emergency situation such as a collision, the winding device 2
The inner shear lock mechanism in 0 operates and weeping 1
In order to abruptly stop the unwinding of 0, and since the slider 26 is located within the vertical part 40 of the guide rail 30, the sliding part S in the groove is connected to the neck part 52 of the guide rail 30 and the stop pin 51.
(arrow C in Figure 3)
Therefore, the occupant 14 can be securely restrained by the webbing 10, and safety is guaranteed. In this case, the tension of the webbing 10 is
Since the shoe 50 is supported by coming into contact with the stop pin 51 or the neck portion 52 of the guide rail 30, a large shearing force is not applied to the shear pin 48 and the shoe 50 will not be destroyed. In addition, when the vehicle is overturned, the anchor plate 24 is loaded upwards of the vehicle (in the direction of arrow D), and the slider 26 tries to move upwards of the vehicle, but since the tape 56 is stopped, this tape A reaction force is generated, and the slider 26 is rotated around the vehicle upper end 58A of the tape opening 58 (see FIG. 3), and a large shearing force acts on the shear pin 48, causing it to be cut. Also, the shoe 50 is broken and the flat head 46 rotates within the guide groove 32 as shown in FIG.

In this way, the flat head 46 rotates within the guide groove 32 and a part of the head 46 comes into pressure contact with the guide groove 32, so that the slider 2
6 is prevented from moving in the direction of arrow D along the guide rail 30, and the restrained state of the occupant is maintained.

In this case, the length of the shoe 50 along the guide groove 32 (the third
The smaller the size (Dimension E in the figure) is, the easier it is to break the shoe 50 and the shear pin 48 even if the reaction force generated on the tape 56 is small. Note that when the passenger opens the door to exit the vehicle after normal vehicle operation, the motor 64 drives the tape 56, and the slider 26 is moved toward the uninstallation position, allowing the occupant to automatically release the webbing. Can be done. In the above embodiment, the sliding part in the groove was locked in the guide groove due to the breakage of the shoe, but the sliding part in the groove was locked in the guide groove only by deformation of the sliding part in the groove, for example, the shoe. Alternatively, locking due to deformation and locking due to destruction may occur in stages.

As an example of this stepwise locking, for example, in the configuration of the above embodiment, when a tension equal to or higher than a predetermined value is applied to the occupant restraining webbing, the shoe is deformed to perform the first stage locking, and an even greater tension is applied to the occupant restraint webbing. When the webbing is applied to the occupant restraint webbing, the shoe is destroyed to perform a second stage of locking, and when even greater tension is applied to the occupant restraint webbing, the pin is also destroyed and the slider is locked at the head. As mentioned above, the emergency locking device according to the present invention locks the occupant restraint weping to the groove-inside sliding part that is slidably supported by the guide groove of the guide rail, The sliding part in the groove is configured so that the shoe is destroyed by the tension generated in the webbing for occupant restraint in an emergency, and when this deformation or destruction occurs, the sliding part in the groove and the inner surface of the guide groove are Since the slider is locked, the occupant can be reliably restrained with a simple structure, which has an excellent effect of ensuring the safety of the occupant.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the emergency locking device according to the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a
FIG. 4 is a perspective view showing how the slider and shoe are attached, and FIG. 5 is an operational view of FIG. 3.

Claims (1)

[Scope of Claims] 1. A guide rail laid along the vehicle body and provided with a guide groove extending in the longitudinal direction, and a guide rail disposed within the guide groove and capable of sliding in the direction in which the guide groove extends. The slider includes a slider having a flat sliding part in the groove that is long in the direction in which the guide groove extends, and a shoe that is attached to the sliding part in the groove of the slider and normally facilitates sliding of the slider in the guide groove. ,
An emergency locking device characterized in that when the shoe is destroyed, friction between the inner surface of the guide groove and the sliding portion in the groove prevents the slider from sliding in the guide groove. 2. The emergency locking device according to claim 1, wherein the in-groove sliding portion is composed of a flat head and a shear pin.