JP2530423Y2 - Safety belt buckle emergency retractor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buckle device for a safety belt device in a vehicle such as an automobile, and more particularly, to a seat belt for preventing a occupant from moving forward during abnormal deceleration such as a vehicle collision. The present invention relates to a buckle emergency retracting device for pulling down a buckle engaged with a tongue to tighten a seat belt.

[0002]

2. Description of the Related Art There is a safety belt device for preventing an occupant from moving forward when the running speed of a vehicle is abnormally reduced (collision accident). Until an accident occurs, this safety belt device is configured to be worn relatively slowly and to allow the occupant to move freely.However, due to abnormal deceleration, the occupant moves forward to tension the belt. And acts on the inertia reel to lock the belt. In such a locked state, the occupant moves forward, albeit slightly, because the belt is fed out of the reel with a slight length. At the same time, if the safety belt is worn slowly, there is sagging, and there is a danger that the occupant will move forward due to the sagging.

In the meantime, the safety belt device is a passive device which merely stops the belt from being pulled out by an emergency lock mechanism which operates by detecting an impact equal to or more than a predetermined value. If there is looseness, the occupant is likely to move forward, and the possibility of crashing into the dash panel or the windshield increases accordingly. Therefore, in order to ensure higher safety, it is desirable to use an active device that tightens the belt a little when the impact is sensed.

[0004] As one of the devices for this purpose, in a so-called three-point support type safety belt device, a pawl (B) is bent by refracting a link that can be folded into two by the action of a sensor mass (weight) that swings by receiving an impact. There is a so-called mechanical buckle pretensioner in which a compressed spring is repelled by actuating a trigger mechanism that enables the rotation of the trigger, and the buckle is pulled down by the resilient force to tighten the belt. (Japanese Unexamined Patent Publication No.
0, JP-A-1-164651 and JP-A-1-244
944).

[0005]

However, since the mechanical buckle pretensioner aims to lower the buckle from a predetermined buckle position that is normally used in the first place, a certain stroke for lowering the buckle is required. A compression coil spring having a large stroke is set below the predetermined buckle position, and a compression coil spring having a large stroke is used in front of the predetermined buckle position. Further, a trigger mechanism for operating the compression coil spring is formed so as to hang down in the height direction. Therefore, it is extremely large as a whole, and is unsuitable for installation in a narrow space between the console box and the seat, and is more and more unsuitable for the recent tendency to require a low hip point. And so on.

One of the causes of the above-mentioned inconvenience is that the configuration of a sensor unit for detecting a shock of a vehicle for operating a trigger mechanism is large, and in the overall configuration, it is located below a compression coil spring. The arrangement requires a large space in the height direction of the seat device.

Therefore, the present invention has been made to reduce the size and size of the sensor portion of the mechanical buckle pretensioner using the compression coil spring, and to provide a mounting structure that does not require a large space.

[0008]

In the safety belt buckle emergency retracting device according to the present invention, a sensor mass that swings upon sensing an impact activates a trigger mechanism, which triggers a compression coil spring. In a safety belt buckle emergency retracting device for pulling down a cable and pulling down a buckle connected to the cable, the sensor mass is rotatably suspended from a bracket protruding from a base of a sensor unit, and a lower portion of the base is provided. Is characterized in that it is configured to be swingable over the.

[0009]

According to the present invention having the above-described structure, the sensor mass which has swung upon sensing an impact swings across the base to activate the trigger mechanism, which triggers the compression coil spring to rebound. Pull the cable and pull down the buckle connected to the cable.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a seat device to which the present invention is applied.
In the drawing, the buckle emergency retraction device of the present invention includes a buckle retraction mechanism 1, a sensor unit 2, and a driving mechanism 3.

In the buckle retracting mechanism 1, a bracket 5 is connected to the end of the sensor unit 2 by bolts 4 and 4, and a guide plate 7 is connected to the bracket 5 by bolts 6 and 6 and the lower end of the guide plate 7 is connected to the inner bottom of the bracket 5. A slider 9 provided with a latch 19 which is connected so as to be in contact with and engages with a guide groove 8 having a predetermined stroke formed in the guide plate 7;
A buckle 10 is connected to the slider 9.

As shown in FIG. 7, the bracket 5 is formed by bending a band-shaped sheet metal to form a hook-shaped mounting portion 5a, a bottom surface 5b,
It has a substantially box shape having a bottom surface 5d spaced from the bottom surface 5b and the bottom surface 5b, and a side surface 5e parallel to the side surface 5c, and the mounting portion 5a has holes 5h through which bolts 4 and 4 are inserted.
5h, and holes 5f, 5f through which the bolts 6, 6 are inserted are respectively formed in the mounting portion 5a and the side surface 5e.
A hole 5g is formed in the opposing side surface 5c.

A roller 12 is fixed to the hole 5g via a pin 11, and a cable 13 is wrapped around the roller 12 as shown in FIG. Tube 54 is fixed, and
One end is connected to each of the sliders 9.
That is, as shown in FIG.
The two strips 15, 16 pin-coupled to 4 are projected,
A pin 17 is fixed to one of the band plates 15 by caulking, and the end of the other band plate 16 is bent into a hook shape to form an engaging portion of the cable end 13a.

As shown in FIG. 8, a pin 17 has a sliding plate 18 for holding the guide plate 7 therebetween, and a ratchet tooth portion which engages with and disengages from a ratchet tooth portion 8a formed in the guide groove 8 in the longitudinal direction. A plate 21 having an elongated hole 20 in which the latch 19 formed with the pin 19a is fastened together and the pin 17 is movably engaged in the longitudinal direction is the guide plate 7
Is fixed on the back of the device.

The latch 19 has its ratchet teeth 1
9a is urged by a spring 22 in the guide groove 8 so that it can always mesh with the ratchet teeth 8a. Although the ratchet teeth 8a and 19a engage together to move the latch 19 downward in the longitudinal direction of the guide groove 8a,
It cannot be moved upward.

The buckle retracting mechanism 1 is fixed to a side portion of the seat cushion 28 and normally compresses a compression coil spring 51 composed of a coil spring of the drive mechanism 3, and its elastic force is reduced by a trigger mechanism 32 described later. Suppressed and set. Then, the bracket 5 is fixed to the upper rail 23 so that the substantially central portion of the buckle 10 becomes the hip point P. Reference numeral 24 denotes a lower rail slidably supporting the upper rail 23, and reference numeral 25 denotes a base plate of the reclining device, and a flange on the outer periphery thereof is fastened together with the bracket 5 to the upper rail 23 with bolts 6, 6. 26 is an arm pivotally mounted on the base plate 25 so as to be able to set a desired inclination angle, 27 is a seat back fixed to the arm 26, 28 is a seat cushion, 29 is a seat pan It is.

The sensor section 2 has a trigger mechanism 32 incorporated in a cover 31 containing a base 30 connected to the bracket 5, and the base 30 is connected to a cylinder 50 of the drive mechanism 3. As shown in FIGS. 2 to 4, the trigger mechanism 32 is formed of a link that can be folded into two and a pawl that rotates by the link. As shown in FIG. 2, the trigger mechanism 32 is fixed to an intermediate portion of the cable 13. Pipe 54
An open groove 46 is formed in the through hole 45 of the base 30 through which the pawl 33 is inserted. In addition, one end of the link 35a is brought into contact with the other end of the link 35 at which the upper end of the pawl 33 is disengaged by an arrow and an arrowhead end, and the other end of the link 35a is connected to the base 30. A sensor mass 37 provided with a pin 36 which is brought into contact with the link 35 and 35a and which enters into the upper portion near the contact portion of the link 35, 35a is swingable on the base 30 by a shaft 38.
It is pivotally supported by a bracket 39 protruding from the upper surface of the "0".

As shown in FIG. 4, the sensor mass 37 has hanging portions 40, 40 formed on both sides of the base 30 at the upper portion, and hangs down from the hanging portions 40, 40 to be integrated below the base 30. A notch 42 is provided on both sides of the base 30 and a notch is provided on the lower surface thereof so that the base 30 can swing back and forth around the shaft 38 upon receiving an impact of a predetermined value or more. The parts 43 are respectively formed. An adjustment screw 43 for adjusting the swing of the sensor mass 37 is provided on the top of the cover 31. Reference numeral 44 denotes a screw for fixing the cover 31 to the base 30.

In FIG. 2, the driving mechanism 3 includes a cylinder 50 connected to the base 30 of the sensor unit 2 and a cylinder 50.
The compression coil spring 51 is housed in a compressed state, and the cable 13 whose end is connected to the center of a circular washer 52 that contacts the end of the compression coil spring 51.

The operation of the safety belt buckle emergency retracting device will be described.
When the sensor mass 37 of the sensor unit 2 swings back and forth about the shaft 38, the pin 36 pushes the butting ends of the links 35 and 35 a of the trigger mechanism 32 to bend downward, thereby rotating the pawl 33. The blocking is released, so that the pawl 33 is rotated to disengage the tube 54 of the cable 13 that has prevented the repulsion, whereby the compression coil spring 51 rebounds and the cable 13 momentarily moves to the left. Move.

Therefore, in FIG.
Is pulled to the left to lower the slider 9 along the guide groove 8, and the slider 9 pulls the buckle 10 downward so as to overlap the guide plate 7 (see the phantom line). The latch 19 is connected to the ratchet teeth 8a,
19a is always urged to engage and the cable 13a
The pin 17 is inserted through the strip 15 integrated with the strip 16 to be pulled by
Is moved to the lower end of the guide groove 8 by being moved downward while being guided by the elongated hole 20, and the slider 9 and the buckle 10 are forcibly pulled down.
The occupant seated on the vehicle and wearing a seat belt, the seat belt is pulled by the buckle 10 and the seat back 27.
Be bound by.

At this time, the slider 9 is engaged with the latch 19 and the ratchet teeth 19a, 8a of the guide groove 8 to engage with each other.
The buckle 10 cannot be moved upward, and the state where the buckle 10 is pulled down can be firmly held.

[0023]

According to the invention described above, the sensor mass is rotatably suspended from the bracket protruding from the base of the sensor portion, and can swing over the lower portion of the base. The dimensions of the sensor in the height direction can be extremely shortened, and the sensor unit can be reduced in size and size. Therefore, it is most suitable for a recent seat device with a reduced hip point.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a seat device to which the present invention is applied.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a partial cross-sectional plan view of FIG. 2;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a partial bottom view of FIG. 1;

FIG. 6 is a partial sectional view of FIG. 1;

FIG. 7 is a partial perspective view of FIG. 1;

FIG. 8 is a partial plan view of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Buckle retraction mechanism, 2 ... Sensor part, 3 ... Drive mechanism, 30 ... Base, 31 ... Cover, 32 ... Trigger mechanism, 33 ... Paul, 35, 35a ... Link, 37 ... Sensor mass, 39 ... Bracket, 41 ... Weight part, 4
2, 43: Notch, 51: Compression coil spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A safety device in which a sensor mass that swings upon sensing an impact activates a trigger mechanism, which triggers a compression coil spring to pull a cable and pull down a buckle connected to the cable. In the belt buckle emergency retracting device, the sensor mass is rotatably suspended on a bracket protruding from the base of the sensor unit,
A belt emergency retracting device for a safety belt device, characterized in that it can swing over a lower portion of a base.