JPS5942282Y2 - seat belt clamp device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a seat belt device, particularly a belt clamp device that prevents excess belt extension from a belt take-up reel in an emergency. This is intended to prevent the seat belt from being cut due to contact between the teeth and the belt surface.

Conventionally, this is normal in seat belt retractors.

An emergency locking mechanism is adopted, but if a strong pulling force is applied to the belt due to stretching of the belt web itself or tightening, even if the locking mechanism prevents the belt from being pulled out, it may still be difficult to completely prevent the belt from being pulled out. There is a considerable amount of extension, and the effect of the long-awaited lock is being diminished.

In particular, this extension is unexpectedly large and affects the locking effect, so various mechanisms have been proposed to prevent this, but most of them cannot withstand the tensile force and cause the belt to slip or break. On the other hand, those that can withstand strong tensile strength are wedged tightly into the belt and do not separate.

This has the drawback that it is necessary to manually return it each time it is returned to its original position, making it virtually inoperable.

Therefore, in view of the actual situation, the inventor of the present invention first developed a retractor 1 as shown in FIG. An uneven roller 6 having a plurality of tooth-shaped protrusions 5 on the outer periphery is provided for winding and turning the belt 4 on the pull-out side of the belt 4 pulled out from the take-up reel 3 installed between the side walls of the U-shaped frame 2. At the same time, when the emergency locking mechanism I provided at the bottom of the take-up reel 3 restricts the rotation of the reel 30 and the pull-out tension of the belt 4 increases, the belt clamping mechanism 10 consisting of fixed teeth 8 and movable teeth 9 is activated. A C-shaped belt lamp device has been proposed so that the uneven roller 6 can move along the elongated hole 11 bored in the U-shaped frame 2 when the belt is actuated. The strip 5 presses the movable tooth 9 toward the fixed tooth 8 side as shown by arrow The belt 4 is held between the teeth 13 and 14, and the extension of the belt 4 is restricted by the frictional force between the belt 4 and the surface of the uneven roller 6 whose rotation is restricted, so that the tension of the belt 4 is reduced. At the time of increase, stress concentrates on the tip of the teeth of the uneven roller 6, and since the belt 4 is bent at the tip of the tooth-shaped protrusion 5 of the uneven roller 6, the frictional force in this area increases and the belt There was a problem that 4 was disconnected.

The present invention has been made in consideration of the belt cutting problem of existing seat belt clamp devices, and has been made to overcome this problem and provide a seat belt clamp device with higher safety. The tips of the tooth-shaped protrusions formed on the outer periphery of the teeth are notched according to an imaginary cylindrical surface passing through the middle part of both sides, and the notched surfaces are roughened, or
Alternatively, it is characterized by a configuration in which a groove is bored.

Hereinafter, the specific contents of the present invention will be explained in detail with reference to the embodiments shown in the attached drawings. Fig. 2 is a partially enlarged side view of the uneven roller used in the clamping device of the present invention. is an uneven roller having a rotary shaft insertion hole 16 in the center, and as shown in FIG. 1, it is arranged so that the belt pulled out below the take-up reel of the retractor can be wound around it to change its direction. As shown in the figure, a plurality of tooth-shaped protrusions 1 are provided on the outer peripheral surface of the uneven roller 15 in parallel with its rotation axis.
7 are provided at equal intervals.

The tip of each tooth profile ridge 17 of this concave-convex row 215 is notched on the tip side according to a virtual cylindrical surface 20 that passes through the middle of both sides 18 and 19 forming this, and is located on the notch surface 21. , V-shaped concave grooves 22, 22 with a groove bottom angle θ of 90° are formed one by one at a predetermined depth d, and the cutout surface 21 is further roughened by knurling. is applied to increase the frictional force with the contacting belt.

FIG. 3 shows another embodiment of the main part of the present invention, in which the uneven roller 15 shown in FIG. In contrast, two V-shaped grooves 22, 22 are provided in parallel to press the button, and in this case, the cutout surface other than the part where each V-shaped groove 22 is formed is knurled. .

However, of course, the formation of grooves and the knurling may be performed only on one side or the other, and in each case, it is necessary to select whether to form only one groove or a plurality of grooves, only knurling, or a combination of both. .

The seat belt clamping device of the present invention has the above-mentioned configuration.Next, its operation is shown in FIG. When the emergency locking mechanism 7 is activated due to a sudden tilt of the vehicle body or sudden withdrawal of the belt, and the rotation of the take-up rule 3 in the withdrawal direction is restricted,
The tension applied to the belt 4 increases, and the uneven roller 15 moves to the elongated hole 1.
1, and while the tooth-shaped protrusion 1T on the outer periphery of the uneven roller 15 fits into the uneven fitting part 12 on the movable tooth 9 side, the movable tooth 9 is pressed toward the fixed tooth 8 side and fixed. The belt 4 is placed between the clamping tooth 13 of the tooth 8 and the clamping tooth 14 on the movable tooth 9 side.
The extension of the belt 4 is restrained and limited by holding the belt 4 between the belts 4 and 4.

At this time, the rotation of the belt 4 is caused by the engagement with the movable teeth 9.
While in contact with the tooth-shaped protrusion of the IJ uneven roller 15,
The belt tries to slide in the direction of pulling out the belt, but in the present invention, since the tips of the teeth of the protrusions are notched, the tooth-shaped protrusions 1T
Friction between the V-shaped groove 22 provided on the notch surface 21 and the roughened notch surface 21 generates a large pulling-out restraining force, and the tooth tip is further divided into a plurality of parts by the V-groove 22. As a result, the stress applied to the belt 4 is dispersed to a plurality of divided contact portions, the sliding action of the tooth tips on the belt 4 is reduced, and breakage of the belt is prevented.

When the seat belt clamp device of this invention was installed in an actual tractor and tested, the belt broke with a load of about 1000 kg compared to the one using the uneven roller of the shape shown in Figure 1. It has been found that belts using the clamping device of the present invention do not break even under loads up to 9 in 2000.

The above-mentioned clamping device of the present invention is normally placed in a passive belt device, for example, in or near a tunnel on the center side of a vehicle body, and is used as a clamping device for shoulder belts, waist belts, or control belts to ensure occupant safety. used for.

As described above, the device of the present invention reverses the direction in which the belt is pulled out and moves the toothed protrusion on the outer periphery of the uneven roller that operates the belt clamping mechanism according to the tension of the belt to the virtual cylindrical surface passing through the middle part of both sides of the protrusion. Since the tooth tips are notched and the notched surfaces of the tooth tips are roughened or grooved, even when the belt extends during emergency locking, the contact of the belt with the uneven rollers will cause stress concentration. This prevents the belt from coming into contact with the tips of the toothed protrusions found on the uneven rollers of conventional clamping devices, bending it significantly, and causing stress to concentrate in this area, resulting in an extremely large frictional force. This makes it possible to avoid inconveniences such as belt breakage, reduces the chance of belt breakage, and, together with the emergency locking mechanism's effect of preventing belt pull-out, has the immediate effect of further perfecting occupant safety through seatbelts. There is expected.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a retrakume incorporating a conventional clamping device using an uneven roller, Fig. 2 is a partially enlarged side view of an uneven roller applicable to the clamping device of the present invention, and Fig. 3
The figure is a partially enlarged side view showing another embodiment of the uneven roller applicable to the same device. 1...Retractor-14...Seat belt, 10...Belt clamping mechanism, 15...
...Concave and convex roller, 17...Tooth-shaped protrusion, 20...
-... Virtual cylindrical surface, 21... Notch surface, 22...
... Concave groove (V-shaped groove).

Claims (1)

[Claims for Utility Model Registration] 1. A retractor provided on the belt drawer side of the retractor so as to turn the direction of movement of the belt, movable in accordance with the belt drawer tension, and having tooth-shaped protrusions on the outer periphery of the roller; In a seatbelt clamping device equipped with a concave and convex roller that moves in response to an increase in tension for pulling out the belt in an emergency and activates a belt clamping mechanism, the tip of the tooth-shaped protrusion is placed in the middle of both sides forming the protrusion. A notch is made according to a virtual cylindrical surface passing through the part, and the notch is roughened, or
Or a seat belt clamp device characterized by having a groove formed therein. 2. The seat belt clamping device according to claim 1, wherein one or more V-shaped grooves of a required depth are provided in the notched surface of the tooth tip of the uneven roller. 3. The seat belt clamp device according to claim 1 or 2, wherein the notched surface of the tooth tip of the uneven roller is knurled.