JPS5917319Y2 - Clamp device for seat belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a clamp device that is attached to a seat belt device, particularly a passive belt mechanism, at or near a tunnel position on the center side of a vehicle body and serves as a guide member for folding and guiding the belt.

Conventionally, seat belt retractors have usually adopted an emergency locking mechanism, but the elongation of the belt web itself,
Or, when a strong pulling force is applied to the safety bell 1- due to tightening, even if the emergency lock mechanism prevents the safety belt from being pulled out, the safety belt will continue to extend considerably until the pullout is completely prevented. The effect of the suppression angle is also diminished.

In particular, the extension of this safety belt is unexpectedly large and has a large effect on the locking effect, so various mechanisms have been proposed to prevent this, but most of them cannot withstand the tensile strength and may slip. Otherwise, it may cause the safety belt to break.On the other hand, those that can withstand tensile force are strongly wedged into the safety belt and cannot be easily removed, and each time you want to put it back in its original position, you have to use a child's hand to put it back together. There were drawbacks such as the operation was troublesome and the device was virtually inoperable.

In view of the above circumstances, the inventor of the present invention rectified the shortcomings of the known clamp devices and proposed a ramp device as shown in FIG. 1, which uses a simple mechanism to ensure that the safety belt is prevented from being pulled out.

That is, this clamping device has a U-shaped base plate 1 having a belt take-up reel 7 around which a safety belt 4 is wound, a shaft portion 2a is movably supported in a long hole 1A, and the outer circumferential surface has an uneven surface. A roller 2, a movable tooth 3 that is pressed by the fluctuation of the uneven roller 2, and a safety belt 4 between the movable tooth 3 and the movable tooth 3.
When the emergency locking mechanism is activated and a pulling force of more than a predetermined value is applied to the safety belt 4, the shaft portion 2a of the uneven roller 2 is moved along the elongated hole 1A. When the movable teeth 3 are moved to the belt clamping side and the fixed teeth 6 sandwich the safety belt 4, and the pull-out force of the safety belt 4 is released, the shaft portion 2a of the uneven roller 2 and the substrate 1
The uneven roller 2 is returned to its original state by a spring 5 stretched between the movable teeth 3 and the movable teeth 3 at the same time, and the safety belt 4 is released from the clamping state. There is.

However, in this type of device, when the safety belt is pulled straight in the length direction, the safety belt uniformly presses the uneven roller, and the uneven roller moves the movable teeth to connect the safety belt to the fixed teeth. Although it is possible to securely clamp the substrate due to the relationship, the shaft portion 2a of the uneven roller 2 is
Since it is movably supported in the elongated hole 1A, when the safety belt is pulled in an oblique direction (direction with respect to the axis in the length direction of the belt width), the uneven roller is also moved diagonally by this safety belt. The uneven rollers did not apply uniform force to the moving movable teeth, weakening the clamping force of the safety belt, and making it impossible to securely clamp the safety belt.

It was also found that this caused problems such as damage to safety belts.

This idea was made based on the above circumstances, and even when a diagonal tensile force is applied to the safety belt, it is possible to sandwich the safety belt with a strong force between the movable teeth and the fixed shaft. It is an object of the present invention to provide a seat belt clamping device that can be manufactured at a low cost and has an extremely simple configuration and is highly reliable.

This invention will be explained with reference to embodiments shown in the drawings.

FIG. 2 is a schematic explanatory diagram showing an embodiment of the seat belt clamp device of this invention when not in use, and FIG. 3 is a schematic explanatory diagram showing the state when it is in operation.

In each figure, reference numeral 10 denotes a clamping device, which comprises a base plate 11 with an emergency locking mechanism, which base plate 11 is not shown, as in many known winding devices. is formed into a U-shape in cross section by the left and right side plates and the bottom plate, and the belt take-up reel 12 is installed between the opposite side plates, and the safety belt 13 is moved in the directions of arrows A and A'. It is wrapped so that it can be drawn out or rolled up.

Further, a concavo-convex roller 14 having a concavo-convex outer circumferential surface is integrally assembled in the lower part of the substrate 11, and a vertically extending roller 14 is bored almost parallel to the opposite position of the substrate 11. A roller support shaft 16 is inserted into the L15 and mounted between the side plates so as to be slidable in the vertical direction.

Note that although the uneven roller 14 is shown as having unevenness on its outer peripheral surface, it is not limited thereto and may have a cylindrical shape.

The protruding portion of the roller support shaft 16 has both ends pivoted to the side plates of the base plate 11 via pins 17 so as to be rotatable in the directions of arrows B and B', and has a cross-sectional shape having a cam portion 18A at the upper portion. U-shaped lever (hereinafter referred to as swing lever)
18 are fitted into the horizontal elongated holes 19, and the other end of a spring 20, one end of which is attached to the side plate of the substrate 11, is attached.

Therefore, the support shaft 16 of the uneven roller 14 is movably supported within the elongated hole 15 of the frame 11, and the elongated hole 15
The swing lever 18 is movably supported in long holes 19 in both side walls of the swing lever 18, which are provided in a direction that intersects with the swing lever 18.

The uneven roller 14 is always urged downward in the figure (in the direction of separation by the belt take-up reel 12) by the urging force of the spring 20, so that the uneven roller 14 is pulled out from the belt take-up reel 12. 13 is rotated and folded back into a U-shape to function as a guide roller for normal guidance.

On the other hand, in the middle of the path of the safety belt 13 from the belt take-up reel 12 to the uneven roller 14, fixed teeth 21 are disposed on the side plate of the base plate 11 on the outside so as to sandwich the safety belt 13, and on the inside. Movable teeth 22 are respectively provided, and these constitute a pinching prevention member.

Among these, the movable tooth 22 has a support shaft 23 bored on both sides thereof.
is slidably mounted on a shaft within a horizontal long hole 24 formed oppositely in both side plates of the base plate 11, and the swing lever 1
8 can be moved between a position where the safety belt 13 is pinched and a position where it is separated from the fixed tooth 21 by engagement with the cam portion 18A.

Further, a spring 25 is attached to the side plate of the base plate 11, which urges the movable teeth 22 in a direction where the movable teeth 22 are always separated from the fixed teeth 21.

In addition, instead of the spring 25, a horizontal long hole 24 provided in the side plate of the base plate 11 may be tilted upward toward the fixed tooth 21 so that the movable tooth 22 is separated by its own weight. .

Further, 26 in the figure is a guide roller that guides the safety belt 13.

Next, the operation of the above device will be explained.

FIG. 2 shows the state when the belt is normally pulled out, and the safety belt 1 is pulled out from the belt take-up reel 12 in the direction of arrow A.
3 is the fixed tooth 21 which is in a separated state after passing through the guide roller 26
A relatively large diameter uneven roller 1 is inserted between the movable teeth 22 and the movable teeth 22.
The hook 4 is rotated so that it comes into contact with the surface of the outer convex portion, changes direction, and is guided in a U-shaped bend.

At this time, the large-diameter uneven roller 14 plays a role as a guide roller, and is positioned downward by the force of the spring 20, so that the support shaft 23 of the movable tooth 22 and the cam portion 18A of the swing lever 18 are separated from each other. The situation is such that

Then, when the emergency locking mechanism is activated due to an accident when the vehicle collides in the above state and a tensile force of more than a predetermined value is applied to the safety belt 13, the uneven roller 14 moves upward against the biasing force of the spring 20. As it moves, the swinging lever 18, which is pivoted on the shaft portion 16 of the uneven roller 14, moves in the direction of arrow B.
The cam portion 18A of the swinging lever 18 comes into contact with the shaft portion 22A of the movable tooth 22, and moves the movable tooth 22 to the right in the figure (towards the fixed tooth 21), thereby moving the movable tooth 22 between the movable tooth 22 and the fixed tooth 21. At this point, clip the safety bell I-13, and then tighten the safety belt 1.
3 will be prevented from extending.

At this time, the shaft portion 16 of the uneven roller 14 is connected to the substrate 11.
Since the swing lever 18 is fitted into the horizontal elongated hole 19 of the swing lever 18 which is pivotally supported on both side plates of the can be raised in parallel.

As a result, even if the safety belt 13 is pulled in an oblique direction and uneven force is applied to the uneven roller 14, the support shaft 16 can be moved through the horizontal long holes provided on both sides of the swing lever 18. 19 prevents the uneven roller 14 from tilting with respect to the axis. Therefore, the movable teeth 22 and the fixed teeth 21 prevent the safety belt 1 from moving in parallel.
3 can be clamped evenly and reliably (as shown in Figure 3).

Further, when the abnormal tensile force applied to the safety belt 13 is released, the uneven roller 14 and the swing lever 18 are moved downward by the urging force of the spring 20 and returned to their original positions, and at the same time, The movable tooth 22 moves in a direction away from the fixed tooth 21 due to the biasing force of the spring 20, and the safety belt 13 is released from the clamp and returned to its normal position (the state shown in FIG. 2).

FIG. 4 is a schematic explanatory diagram showing another embodiment of the seat belt clamp device of this invention in a non-operating state.

This is a swinging lever 1 which has the cylindrical roller 14' mounted on its axis.
The device differs from the device of the previous embodiment in that the supporting shaft 23 of the movable shaft 22 is attached to the upper part of the movable shaft 22, and the movable teeth 22 are reciprocated (integrally) at the same time as the swinging lever 18 swings. Since this is the same as in the previous embodiment, a detailed explanation of its structure and operation will be omitted.

This configuration has the effect that the roller 14' can be manufactured easily, and the spring 25 can be omitted, reducing the number of parts and ensuring reliable operation.

Further, by using a cylindrical roller, processing during manufacturing and positioning during assembly are facilitated.

The above description is an example of the seat belt clamp device of this invention, and it goes without saying that this invention is not limited to this, and can be modified as appropriate without departing from the gist thereof.

For example, in the above-mentioned embodiment, U is described as one in which the uneven roller 14 is moved in parallel by rotating the swing lever 18, but instead of this, the swing lever follows the uneven roller 14. A guide rod may be provided on the base plate 11 so that the base plate 11 can move in parallel, and a swing lever may be attached to the guide rod so that the base plate 11 can move along the guide rod.

As mentioned above, the seat belt clamp device of this invention is usually a passive belt device, which is located in or near the tunnel on the center side of the vehicle body, and is used to prevent the shoulder belt, waist belt, or control belt from extending. As a result, the safety of passengers can be ensured.

As described above, this invention is installed integrally with the take-up device and prevents the extension of the belt when it is pulled out from the belt take-up reel, so it more fully ensures the safety of the occupants through emergency locking. In addition, it does not require many guide rollers, and the movable teeth engage the fixed teeth via a lever using the guide rollers that change direction, thereby aiming at pinching the safety belt. However, the structure is extremely simple and can be made smaller.

In addition, since both ends of the roller are configured to be moved simultaneously by a lever, even if the safety belt is pulled diagonally, the roller can be moved in parallel, allowing the movable teeth to move simultaneously. It can be moved uniformly and held evenly and reliably without weakening the clamping force.

Moreover, not only does it have the advantage of not being restricted by the installation location, but the movable teeth engage with the fixed teeth to prevent slippage and ensure a reliable sliding lock.Furthermore, the configuration is extremely simple, making it a highly reliable product at a low price. It has excellent effects such as being able to supply a large number of people.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram showing an example of a conventional seat belt clamp device, Fig. 2 is a schematic explanatory diagram showing an embodiment of the seat belt clamp device of the present invention when it is not in operation, and Fig. 3 FIG. 4 is a schematic explanatory diagram showing a state in which the seat belt clamp device according to the present invention is in operation, and FIG. 1... Board, 2... Uneven roller, 3.
...Moving tooth, 4...Safety belt, 5...
...Spring, 6...Fixed teeth, 7...
... Belt take-up reel, 10 ... Clamp device, 11 ... Board, 12 ... Belt take-up reel, 13 ... Safety belt, 14・・・・・・
...Concave and convex roller, 15...Long hole, 16...
...Roller spindle, 17...Pin, 18...
...Swinging lever, 18A...Cam part, 19...
...Long hole, 20...Spring, 21...
...Fixed teeth, 22...Movable teeth, 23...
...Spindle, 24...Elongated hole, 25...
Spring, 26...Guide roller.

Claims (4)

[Scope of utility model registration request] (1) A U-shaped substrate with a belt take-up reel installed between opposing side plates, and a belt that is slidably mounted on a shaft in a pair of long holes bored in the opposite side plates and pulled out from the take-up reel. A roller having a belt wound around it, fixed teeth arranged along the belt pulled out from the take-up reel, fixed teeth fixed to the substrate, and fixed teeth sandwiching the belt. In the clamping device, the shaft portion of the roller is fitted into the holes on both sides of the clamping device, and the movable teeth are disposed opposite to the fixed teeth and are movable back and forth between a position in which the teeth engage with the fixed teeth and a position in which they do not engage with the fixed teeth. a U-shaped lever that reciprocates following the roller and reciprocates the movable teeth along with this movement; and an urging member that biases the roller to a position where the belt is guided. A biasing member is provided, and the roller normally guides the belt normally, and when a tensile force of a predetermined value or more is applied to the belt in an emergency, the roller and lever are moved in parallel against the biasing force of the biasing member. A seat belt clamp device characterized in that the movable teeth are engaged with the fixed teeth by movement of a lever and the belt is clamped between each tooth, thereby preventing the belt from extending. (2) The elongated hole supporting the spindle of the roller of the U-shaped lever is provided in a direction intersecting the moving direction of the roller, and is rotatably supported on the base plate. A seat belt clamp device according to claim 1 of the utility model registration claim. (3) The seat belt clamp device according to claim 1, wherein the movable teeth of the restraining member are pivotally supported by the lever. (4) The seat belt clamp device according to claim 1, wherein the U-shaped lever forms a cam portion that comes into contact with a shaft portion of a movable tooth.