JPS6321485Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamp device which is installed at or near a tunnel position on the center side of a vehicle body in a seat belt device and serves as a guide member for folding and guiding the belt.

Conventionally, seat belt retractors usually employ an emergency lock mechanism, but if a strong pulling force is applied to the belt due to stretching of the belt webbing itself or tightening, the lock mechanism prevents the belt from being pulled out. However, there is still a considerable amount of belt extension before the drawer is completely blocked, and the effectiveness of the long-awaited lock is diminished.

In particular, the extension of this belt is surprisingly large,
Various mechanisms have been proposed to prevent this from affecting the locking effect, but most of them cannot withstand the tensile force and cause the belt to slip or break. The belts that can withstand this type of operation are strongly wedged into the belt and do not come off easily, and each time they need to be put back together, they have to be put back in place by hand, which is cumbersome and makes them virtually inoperable. There were flaws.

In view of the above circumstances, the inventor of the present invention has conducted various studies and proposed a clamping device that corrects the shortcomings of the known clamping devices and reliably prevents the belt from being pulled out using a simple mechanism.

This clamping device includes a U-shaped substrate having a belt take-up reel for winding a belt, a shaft portion of which is movably supported in a long hole, and an uneven roller having an uneven outer peripheral surface. A movable tooth that is pressed by the fluctuation of the unevenness and a fixed tooth that clamps the belt between the movable tooth and the belt are arranged. When the movable teeth are moved to the belt holding side and the belt is clamped between the fixed teeth and the belt pull-out force is released, a spring tensioned between the shaft of the uneven roller and the base plate causes the uneven roller to move. The movable tooth returns to its original state at the same time, and the movable teeth also return to their original state to release the belt. When pulling straight in the horizontal direction, even if it is possible to press the uneven roller uniformly with the belt and move the movable teeth of the uneven roller to securely sandwich the belt in relation to the fixed teeth, the uneven roller Since the shaft of the frame is movably supported in the elongated hole of the frame, when the belt is pulled in an oblique direction (direction with respect to the longitudinal axis of the belt width), this belt causes the uneven roller to move in the same way. When the belt moves diagonally, the uneven rollers do not apply force uniformly to the moving movable teeth, weakening the belt's clamping force and making it impossible to securely clamp the belt. It was found that problems such as damage occurred.

Therefore, the inventor of the present invention further investigated the improvement thereof, and as a result, came to propose an improved clamping device again.

This device is different from the above-mentioned device in that it has a U-shaped lever attached to the uneven roller that reciprocates to follow the uneven roller, so even if the belt is pulled diagonally, the uneven roller can be moved parallel It is possible to maintain a uniform clamping force by moving the clamping device, and it is excellent in ensuring the clamping force is reliable compared to the above-mentioned device, and has sufficiently fulfilled the role of improvement.

However, in this device, the uneven roller and the movable teeth were formed separately, and it was discovered that there was still room for improvement in the utilization of the space within the narrow U-shaped board of the winding device. When considering how to use the tooth as a dual purpose, we found that if the uneven roller and the fixed tooth were only engaged, an excessive load would be placed on the uneven roller to ensure the engagement between the two, and the engagement with the uneven roller would be reduced. It is necessary to either increase the strength or make the uneven roller stronger. In the former case, there is a risk of damage to the clamping belt, and in the latter case, the cost may increase due to the material etc. of the uneven roller. However, the situation was difficult to achieve favorable results.

The present invention was devised based on the above-mentioned circumstances and to further overcome the difficulties.It is based on a method of engaging and disengaging the uneven roller and the fixed teeth, and has an extremely simple structure and high reliability. It is an object of the present invention to provide a seat belt clamp device that can be supplied at a low cost and has a high quality product.

Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the accompanying drawings.

FIG. 1 is a schematic explanatory diagram showing an embodiment of the seat belt clamping device of the present invention when it is not in operation, and FIG. 2 is a schematic explanatory diagram showing its state when it is in operation.

In each of these figures, 1 is a board of the winding device, and like many known winding devices, this board 1 is formed into a U-shape by left and right side plates and a bottom plate (not shown). A belt take-up reel 2 is rotatably supported between the opposite side plates, and a seat belt 3 is wound so as to be drawn out and retracted. Then, the substrate 1
A large-diameter uneven roller 4 having an uneven outer circumferential surface is integrally assembled at the lower part of the take-up reel 2, and oblique long holes are bored substantially parallel to each other in opposing positions of the substrate 1. A roller support shaft 6 is inserted and mounted between the side plates so as to be slidable diagonally on the roller support shaft 5 . Further, both ends of the protruding portion of the roller support shaft 6 are fitted into shaft holes 9 of a U-shaped swing lever 8 which is pivotably supported on the side plate of the board 1 via pins 7 and is rotatably provided. At the same time, one end of the spring 10 is attached to the side plate of the substrate 1, and the other end portion of the spring 10 is attached. Therefore, the support shaft 6 of the large-diameter uneven roller 4
is movably supported in the elongated hole 5 of the base plate 1, and has a shaft hole 9 in both side walls of the swing lever 8, which shaft hole is preferably large enough to fit the roller support shaft 6. Although the hole 9 does not have much room, it is supported within the hole 9.

The large diameter uneven roller 4 has a spring 10.
The safety belt 3 pulled out from the belt take-up reel 2 is constantly urged in the lower right direction in the figure (in the direction away from the belt take-up reel 2) by the urging force of It is folded back into a letter shape and acts as a guide roller for normal guidance.

On the other hand, the large-diameter uneven roller 4 also acts as a movable tooth for fixed teeth, which will be described later.
In the middle of the route of the belt 3 leading to the belt 3, fixed teeth 11 are disposed in the side plate of the base plate 1, facing the uneven roller 4, and sandwiching the safety belt 3. The fixed teeth 11 constitute a clamping pressure suppressing member.

Next, in the device of the present invention, as shown in the illustrated example, a small diameter uneven roller 12 is disposed between the large diameter uneven roller 4 and the take-up reel 2.
This small-diameter uneven roller 12 has support shafts 13 protruding from both sides thereof, which are slidably supported in horizontal long holes 14 formed oppositely in both side plates of the substrate 1. It is designed to be able to engage with and disengage from the uneven roller 4, and as it engages and disengages, it also shifts between a position where it clamps the belt 3 and a position where it separates from the fixed tooth 11. I'm starting to get it. For this reason, the other end side of the spring 15 whose one end is supported on the side plate of the substrate 1 is attached to the spindle of the small diameter uneven roller 12, and the small diameter uneven roller 1
2 is always urged in a direction away from the fixed teeth 11 and the large diameter uneven roller 4.

In addition, in the figure, 16 is an emergency lock mechanism attached to the take-up reel, and 17 is an emergency lock mechanism attached to the small diameter uneven roller 12 and fixed tooth to prevent the belt from being damaged on the belt clamping surface due to an excessive emergency load. In addition to limiting the engagement depth with 11, the small diameter uneven roller 1
This is a biting limiting member that simultaneously limits the biting depth between the large diameter uneven roller 4 and the fixed teeth 11 by meshing the large diameter uneven roller 2 with the large diameter uneven roller 4.

In addition, 18 indicates that the belt is being pulled out in an inappropriate direction;
For example, it is a belt extending member that serves both to prevent the slack side of the belt from falling when it is pulled out in an oblique direction and to absorb the slack of the belt. As shown in Figures 5 and 6, when adjusting the front and back position of the seat depending on the size of the occupant, or when the occupant sitting on the seat moves forward or downwards due to a frontal collision of the vehicle. As shown in FIG. 5, the seat belt escapes from the proper direction of pulling out the winding device, that is, the direction perpendicular to the axis of the uneven roller, and is pulled out diagonally to the lateral direction, as shown in FIG. As a result, the contact area between the large-diameter uneven roller 4 and the belt 3 is biased to one side, causing the belt 3 to have a slack side and a tension side, and when the tension side of the belt reaches its limit of elongation, This causes a situation where the passenger cannot be restrained, and the loose side of the belt 3 gets caught between the end of the large-diameter uneven roller 4 and the side plate of the base plate 1, which causes damage to the belt. This is to prevent this problem from occurring.

Therefore, it is usually provided near the side plate of the substrate through which the belt to be pulled out passes.

The provision of the biting limiting member 17 and the belt extending member 18 is an essential feature of the device of the present invention.

Next, the operation of the apparatus having the above structure will be explained based on FIGS. 1 and 2.

Figure 1 shows the state when the belt is normally pulled out.
Safety belt 3 pulled out from belt take-up reel 2
The fixed teeth 11 and the small diameter uneven roller 1 are separated from each other.
2 and is passed around a relatively large-diameter uneven roller 4, and is guided in a U-shaped bend by contacting the outer circumferential convex surface of the roller 4 and changing direction. At this time, the large-diameter uneven roller 4 plays a role as a guide roller, and is positioned at a separated position by the spring 10, and the fixed tooth 11 and the small-diameter uneven roller 12
It is separated from.

In the above state, the emergency lock mechanism is activated due to an accident such as a collision of the vehicle, and the safety belt 3 is activated.
When a tensile force of more than a predetermined value is applied to the large diameter uneven roller 4, the large diameter uneven roller 4 moves diagonally upward against the urging force of the spring 10, and the uneven surface of its outer circumference engages with the uneven surface of the small diameter uneven roller 12. , double uneven roller 4,1
2 stop rotating integrally with each other and open the elongated hole 5,
Fixed tooth 11 by relative movement to the left in the figure within 14
direction, the belt 3 is sandwiched between the fixed teeth 11, and subsequent extension of the belt 3 is prevented. At this time, since the shaft portion of the large-diameter uneven roller 4 is fitted into the hole 9 of the swing lever 8 which is pivotally supported on both side plates of the substrate 1 via the pin 7, the swing lever 8 is simultaneously rotated and transferred along the shaft 6 of the large-diameter uneven roller 4.

As a result, even if the belt 3 is pulled diagonally and an uneven force is applied to the large-diameter uneven roller 4, the support shaft 6 will fit into the hole 9 provided on both side walls of the swing lever 8. Therefore, since inclination with respect to the axis is prevented, the large-diameter uneven roller 4 always moves in parallel, and the belt 3 can therefore be sandwiched evenly and reliably by the large-diameter uneven roller 4 and the fixed teeth 11. (See Figure 2). At this time, since most of the diagonal tensile force of the belt 3 is applied to the elongated hole 5 of the base plate 1, the strength of the pin 7 of the swing lever 8 does not need to be designed to be so high.

Furthermore, when the abnormal tensile force applied to the belt 3 is released, the large-diameter uneven roller 4 and the U-shaped swinging lever 8 are moved by the urging force of the spring 10 and returned to their original positions. At the same time, the small-diameter uneven roller 12 also moves in a direction away from the fixed teeth 11 due to the biasing force of the spring 15, releases the belt 3, and returns to its normal position.

3 and 4 show another embodiment of the clamping device of the present invention, in which a small diameter uneven roller 12 is used together with a large diameter uneven roller 4 and a fixed tooth 1.
Although it is designed to engage and disengage from 1,
In this embodiment, although the large diameter uneven roller 4 engages with the fixed teeth 11 and clamps the belt therebetween, there is no fixed tooth portion that engages with the small diameter uneven roller 12, and therefore the small diameter The uneven roller 12 does not engage with the fixed tooth 11, but instead engages with the small diameter uneven roller 12.
A horizontal elongated hole 14 on which a support shaft 13 is mounted is deeply formed in the substrate bottom plate side, and the belt 3 is pushed toward the substrate bottom plate in the middle from the take-up reel 2 to the large-diameter uneven roller 4. Configured to provide a tortuous passageway. This is suitable for relatively small loads.

In this case as well, the small-diameter uneven roller 12 and the large-diameter uneven roller 4 mesh with each other, stop their rotation, and work together in the same manner as in the embodiments shown in FIGS. The process is carried out in the same manner except for the engagement between the uneven roller 12 and the fixed tooth 11.

In addition, in Figures 3 and 4, Figures 1 and 2 are
The same reference numerals as in the figure indicate the same parts.

The above explanations are examples of the clamping device of the present invention, and it goes without saying that the present invention is not limited thereto, and can be modified as appropriate without departing from the gist thereof.

For example, in the above embodiment, the U-shaped swinging lever 8
describes a system in which the uneven roller 4 is moved in parallel, but instead of this, a guide rod is provided on the substrate 1 so that the lever follows the uneven roller 4 and moves in parallel, and the lever is attached to the guide rod. It may be configured by attaching it.

The clamping device of the present invention as described above is normally placed in the center of the vehicle body in an automatic belt, and is used to prevent the shoulder belt, waist belt, or control belt from extending to ensure the safety of the occupants. Although it is suitable, it is not limited to automatic belts, and the effect can be sufficiently exhibited even when applied to conventional manual belts and the like.

Further, since the outer side of the vehicle body generally has a smaller load than the center side of the vehicle body, the purpose can be sufficiently achieved by using the device shown in FIGS. 3 and 4.

As described above, the present invention is installed integrally with the winding device and prevents the belt from extending when the belt is pulled out from the belt winding reel. Therefore, the safety of the occupants can be ensured more safely through the emergency lock. In addition, it does not require many guide rollers, and the guide roller that changes the direction is a large-diameter uneven roller.This uneven roller engages with fixed teeth and uses the unevenness to suppress the clamping pressure of the safety belt. Because of this, its structure is extremely simple and it can be made smaller than other types, and a small-diameter uneven roller is provided between the take-up reel and the large-diameter uneven roller, and the small-diameter uneven roller is By interlocking the concave and convex portions of the concave and convex roller with the large diameter concave and convex roller, the rotation of both concave and convex rollers is stopped. This reliably prevents the rotation of the concave and convex rollers due to their surface contact, thereby achieving a belt clamping effect. In addition to making it more reliable, it is possible to disperse the resistance caused by holding the clamping pressure between the fixed teeth and alleviate the resistance applied to the large diameter uneven roller, increasing the strength and improving the function of the clamping device.

In particular, if both ends of the large-diameter uneven roller are moved simultaneously by a U-shaped lever, even if the belt is pulled in an oblique direction, the uneven roller can be moved in parallel. This makes it possible to move the movable teeth uniformly, making it suitable for uniform and secure holding without weakening the clamping force.In addition, by providing an overhanging member, it is possible to further prevent the belt from falling in diagonal directions. It is effective in absorbing sagging skin.

Thus, the device of the present invention not only has the advantage of not being restricted by the installation location, but also has excellent effects such as the engagement of the concave and convex portions of the two to prevent slippage and ensure a reliable sliding lock.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an embodiment of the seat belt clamp device of the present invention when it is inactive;
Figure 2 is a schematic explanatory diagram showing the state during the same action, Figure 3
The figure is a schematic explanatory diagram showing another embodiment of the seat belt clamping device of the present invention when it is inactive, FIG. 4 is a schematic explanatory diagram showing the same operating state, and FIG. 5 is a diagram showing the belt being improperly pulled out. The explanatory diagram, FIG. 6, is an explanatory diagram showing the operating state of the overhanging member. 1... Board, 2... Belt take-up reel, 3...
Seat belt, 4...Large diameter uneven roller, 5...Long hole, 6...Large diameter uneven roller support shaft, 7...Pin, 8
... U-shaped swinging lever, 9 ... Shaft hole, 10 ... Spring, 11 ... Fixed tooth, 12 ... Small diameter uneven roller, 13 ... Small diameter uneven roller support shaft, 14 ... Long hole, 15 ... ...Spring, 17... Biting limiting member, 18... Overhanging member.

Claims (1)

[Claims for Utility Model Registration] 1. A belt take-up reel 2 equipped with an emergency lock mechanism 16, which is pivotally supported between opposing side plates of a U-shaped substrate 1;
A shaft 6 is slidably and rotatably mounted in a pair of long holes 5 formed opposite to each other on both side plates on the belt drawer side of the reel, and a position where the belt 3 is normally wound and guided outward. It is equipped with a large diameter uneven roller 4 which is elastically biased 10, and fixed teeth 11 provided on the substrate surface so as to be able to engage with the roller. In a clamping device in which a roller 4 slides in a long hole 5 and clamps the belt between fixed teeth 11, a hole is formed facing the both side plates between the large-diameter uneven roller 4 and the take-up reel 2. A pair of long holes 14 provided
and is slidably and rotatably supported 13 in the elongated hole,
In addition, a small-diameter uneven roller 12 is provided which is biased 15 in a direction that allows the belt to pass under normal conditions, and the small-diameter uneven roller 12 and the large-diameter uneven roller 4 slide within the long holes 14 and 5 during emergency locking. A seat belt clamping device characterized in that the belt is clamped between at least a large-diameter uneven roller 4 and fixed teeth 11 by meshing with each other, and both rollers 4 and 12 are prevented from rotating. 2. Both shaft ends 6 of the large-diameter uneven roller 4 are passed through the shaft holes 9 on both sides of the U-shaped swinging lever 8, which is pivotally connected to the base end pin 7 on the both sides of the roller, and then the shafts 6 are inserted into the long holes 5 on both sides of the substrate. A seat belt clamp device according to claim 1, which has been registered as a utility model. 3 Claims for Utility Model Registration: Belt extension members 18 for preventing the belt from dropping are provided near the positions of both side plates of the U-shaped substrate through which the belt 3 wound around the large-diameter uneven roller 4 and pulled out passes. The seat belt clamp device according to item 1. 4. A biting limiting member 17 is provided near the entrance of the belt holding part to allow slippage on the belt holding surface due to excessive emergency load and to limit the depth of biting engagement between the small diameter uneven roller 12 and the fixed teeth 11. A seat belt clamp device according to claim 1 of the utility model registration claim.