JPH021697B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anchor attachment device used for a vehicle seat belt.

Occupants who wear seatbelts have a wide variety of physiques, so for safety reasons, it is necessary to be able to adjust the length of the webbing as well as the attachment position of the anchor plate that supports the webbing (especially the anchor plate for shoulder webbing). is more preferable. This is because if the shoulder webbing anchor plate is positioned too high, the webbing will pass through the occupant's face or neck, and if it is positioned too low, it will leave the shoulders and pass through the arms, making it difficult to effectively support the occupant in an emergency. This is because there is a risk that protection may not be possible.

In view of this problem, various adjustable anchor attachment devices have been proposed. Many of them are
Attach the latch member integrally with the anchor plate,
Either the anchor plate is moved by pushing or pulling and the latch member is engaged with the optimal mounting hole, or the latch member is movably mounted on the slide member to which the anchor plate is attached and the slide member is guided. The position of the anchor plate is adjusted by engaging the latch member with an optimal mounting hole provided in the guide member. The latch member is then urged into the engaged position by spring means to maintain the anchor plate in its installed position. However, with this type of attachment device, when an impact force acts in a direction along the direction of movement of the latch member, such as in the case of a side collision of a vehicle, the latch member resists the biasing force of the spring means due to its own inertia force. There is a risk that it will move against the resistance and come off from the mounting hole. When such a situation occurs, the mounting position of the anchor plate moves, and as mentioned above, there is a possibility that the occupant may not be effectively protected.

Taking these circumstances into consideration, the present applicant has previously proposed a method of moving the latch member via a screw in the latter case. Although this achieved the intended purpose to some extent, it was necessary to reduce the lead angle of the screw in order to more reliably prevent the latch member from moving. In some cases, it is necessary to reduce the amount of rotation of the screw, and for this reason, it has become necessary to satisfy the contradictory demands of increasing the lead angle of the screw or requiring a screw with a large diameter.

The present invention has been made against this background, and the latch member does not move even if an impact force is applied along the direction of movement of the latch member, so that the anchor plate attachment device is reliably maintained. The purpose of the present invention is to provide a more compact anchor attachment device with good operability.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a seat belt in which the device of the present invention is attached to a center pillar. The continuous webbing 3 is housed in a take-up device 2 whose one end is fixed below the center pillar 1. The continuous webbing 3 includes shoulder webbing 5 which passes through the anchor plate 11, is folded back and extends to the tongue 4, and a shoulder webbing 5 which is folded back from the tongue 4 and extended to the tongue 4. It consists of a waist webbing 8 whose end is sewn to an anchor plate 7 fixed to the outer side of the seat 6. A buckle device 9 is provided on the inner side of the seat 6 via a flexible support 10, which can engage and disengage the tongue 4 at will. The anchor attachment device according to the present invention supports the anchor plate 11 used in such a seat belt so that the position thereof can be adjusted. The figure is a sectional side view of the assembled state seen from the direction A in FIG. 1, and FIG. 4 is a sectional view taken along the line B--B in FIG. 3, showing the relationship between the adjuster base and the latch piece. The anchor attachment device mainly includes an adjusting base 12 attached to the center pillar 1, an adjusting anchor 13 that is an anchor member that is guided along the adjusting base and can slide in the vertical direction, and an adjusting anchor 13 that is slidable on the adjusting anchor. movably supported latch piece 1
4, a release shaft 15 as a release member supported on the adjuster anchor 13;

Adjustment base 12 has mounting holes 1 at both upper and lower ends.
6 and 17 are bored and fixed above the center pillar with bolts 18 and 19. Both mounting holes 1
Between 6 and 17, there are a plurality of notches 20 serving as engagement parts.
is formed. An adjustment anchor 13 is attached to surround the adjustment base 12. The adjustment anchor 13 includes a front part 21 to which the anchor plate 11 is attached, a pair of side walls 22 and 23 extending from the front part, and a back part 26 extending from the side walls in a direction approaching each other.
26, and has a substantially C-shaped cross section. The front part 21 of the adjustment anchor 13 includes
A support shaft 23 for supporting the release shaft 15 is swaged upward, and around it are mounting holes 24, 24 for mounting the latch piece 14, and a bulge 25 for mounting the anchor plate 11 below. are formed, and guide portions 27, 27 for guiding the latch piece are formed on the back surface portion 26, respectively. The adjustment anchor 13 has an adjustment slider 28 attached from the lower side (the upper and lower parts are based on FIG. 3) and a clip 30 that engages with the ends 29 of the slider from the upper side. It is designed to move smoothly along the adjuster base.

The latch piece 14 is made up of a side part 31 that is loosely inserted into the mounting hole 24 of the adjusting anchor front part 21, leg parts 32, 32 that are accommodated in the guide part 27 of the back part 26, and connecting parts 33, 33 that connect the two parts. It has a pair of leg-like parts 60, 60 that face each other, and a connecting part 62 that connects these leg-like parts. As is clear from FIG. 4, the side portion 31 of the latch piece 14 engages with the notch 20 of the adjuster base 12. The connecting portion 62 of the latch piece is formed with a projection 42 (three in the figure) for engaging with a cam groove 41 of the release shaft 15, which will be described later, and a mounting hole 47 for mounting the latch spring 35.

The release shaft 15 is rotatably supported around a support shaft 23 fixed to the adjustment anchor 13. The large diameter portion 34 has a mounting hole 36 for mounting a latch spring 35, which will be described later.
A plurality of protrusions 38 are formed to engage with a cap 37 fitted into the large diameter portion to prevent slippage. A knob 39 is formed on the cap 37 so that it can be easily operated with a finger or the like. Further, cam grooves 41 (three in this embodiment) are formed in the small diameter portion 40 of the release shaft 15 to engage with the latch piece 14 and move the latch piece relative to the adjuster base 12. ing. As is clear from FIG. 6 showing the unfolded shape, the cam groove is a groove for guiding the latch piece 14, which is in the engaged position with the adjuster base 12, to a non-engaged position where it does not engage with the adjuster base. a first engagement surface 43 (see b in the same figure) as one engagement means;
It is located on the disengaged position side of the latch piece 14 in the engaged position, and comes into contact with the latch piece when it attempts to move to the disengaged position due to inertia, thereby preventing the latch piece 14 from moving toward the disengaged position. A second engaging surface 44 as a second engaging part means for
(See a in the same figure). In the figure, 45 indicates the lower end of the release shaft 15. The release shaft 15 has a retaining ring 46 fixed to the support shaft 23.
The front face portion 21 of the adjuster anchor 13 prevents the support shaft from moving in the direction along the axis.

The above release shaft 15 and latch piece 14
A latch spring 35 as a biasing means whose ends are locked in the mounting holes 36 and 47, respectively, is provided between the two. The latch spring exerts a force to return the release shaft 15 to its original position when it is rotated, and also keeps the latch piece 14 in place at the front surface 21 of the adjuster anchor 13 at all times.
It also exerts a pushing force in the direction of.

Furthermore, a mounting member 49 that is fitted into the mounting hole 48 is provided in the bulging portion 25 below the adjusting anchor 13.
Anchor plate 11 is rotatably attached via collar 51 and spacer 52 around bolt 50 which is engaged with the female threaded portion of anchor plate 11 .

Next, a case in which this embodiment is used will be described. The passenger sits on the seat, inserts the tongue 4 into the buckle 9 as shown in Fig. 1, and attaches the continuous webbing 3.
If the shoulder webbing 5 passes over the shoulders of the occupant when the vehicle is worn, the restraint is good and there is no need to adjust the position of the anchor plate 11.

However, if the shoulder webbing 5 passes over the passenger's face and neck, the anchor plate 11
It is necessary to adjust it downward, and conversely, upward if it passes through the passenger's arm. In this case, if the knob 39 of the cap 37 is rotated from the state shown in FIG. 3 (clockwise in FIG. 2), the latch piece 14 engaged with the cam groove 41 of the release shaft 15 integrated with the cap It moves in the direction of arrow C while being guided by the first engaging surface 43 of the cam groove (see FIG. 6b). At this time, the second engagement surface 44
has moved to a position away from the direction of movement of the latch piece 14, so there is no problem in moving the latch piece in the above direction. Therefore, the latch piece 14 is out of engagement with the adjuster base 12. The state at this time is shown in FIG.

The rotation angle of the release shaft 15 is preferably about 90° to 120° considering operability, but in order to guide the latch piece 14 to the disengaged position at the above rotation angle, a cam groove is formed in the release shaft 15. The inclination Θ of the first engaging surface is preferably about 30° to 45°. Note that the inclination of the first engagement surface does not necessarily need to be constant. In some cases,
It is possible to change the shape to an arc shape with a constant curvature, a curved shape with a varying curvature, or a broken line shape with a varying slope midway.

If the adjustment anchor 13 is moved upward or downward while maintaining the state shown in FIG. On the one hand, the release shaft is rotated back to its original position (counterclockwise in Figure 2);
Furthermore, the latch piece 14 moves in the direction approaching the adjuster base 13 and returns to the state shown in FIG. 3. In the above operation, the adjustment anchor 13 is moved while the release shaft 15 is rotated, so a one-touch operation is possible and adjustment operations can be performed quickly.

Subsequently, a method for preventing movement of the latch piece 14 when the latch piece 14 receives a force along the direction of movement of the latch piece 14 due to a side collision of a vehicle or the like will be described. For example, when receiving an impact force to the right in the state shown in FIG. 3, the latch piece 14 moves to the left (in the direction of arrow C) relative to the adjuster base 12 due to its own inertia, that is, toward the disengaged position. trying to move to. However, in the case of the cam groove 41 of this embodiment, the second engagement surface 44 is located on the non-engaged position side when viewed from the latch piece 14 in the engaged position.
is formed (see Fig. 6a), and its movement is prevented by coming into contact with the engaging surface (the cam groove, that is, the release shaft 15 is connected to the retaining ring 4 as described above).
6), the latch piece 14 cannot move in the C direction. Therefore, even if the latch piece 14 in the engagement position with the adjuster base 12 receives a force in the direction of movement, it will not move toward the non-engagement position, and the attachment position of the anchor plate 11 will be reliably maintained. Ru. It is most preferable that the second engaging surface extends in a direction (Y-Y direction) perpendicular to the moving direction (X-X direction) of the latch piece 14, as shown in FIG. However, doing so is not an absolutely necessary condition. That is, if the coefficient of friction between the latch piece 14 and the second engagement surface 44 is μ, then a straight line (a straight line extending with an angle α with respect to the Y-Y direction that satisfies tanα<μ) (see Figure 7), a polygonal surface, a curved or arcuate surface including a curvature such that the inclination α of the tangent at the engagement portion with the latch piece 14 with respect to the Y-Y direction satisfies the above-mentioned conditions. It may be hot. However, in any case, operability will be better if the latch piece is moved by reducing the rotation angle of the release shaft 15.
It is preferable that the inclination Θ of the first engagement surface is larger than the inclination α of the second engagement surface.

Next, FIG. 8 shows a modification of the cam groove formed in the release shaft, in which the first engagement surface 53 extends to the lower end 55 of the release shaft. If the cam groove 57 is formed like this,
Parts processing is easier than in the example described above.
Since the functions are the same as those in the example described above, the explanation will be omitted.

The above embodiments are merely illustrative, and the release member may be configured to slide along the front surface of the adjustment anchor instead of rotating.

Furthermore, the latch piece is not limited to one that moves relative to the adjuster anchor, but may be configured to be integrally attached to the anchor plate via an anchor member, as described in the conventional example. Furthermore, instead of being directly engaged with the release member, it may be connected via some intermediate member, or furthermore, the release member may be operated by some kind of operating means.

In addition, in the above explanation, we have described a type of seat belt in which the middle part of the shoulder webbing is inserted through an anchor plate for support, but a type of seat belt in which the end of the shoulder webbing is latched to an anchor plate is also applicable. Of course, anchor attachment devices could be used as well.

As is clear from the above description, since the anchor attachment device according to the present invention has the first engagement means and the second engagement means, the latch piece is reliably maintained in the engagement position, so that in the event of a side collision of the vehicle. In addition to being able to safely protect the occupants, it is also possible to obtain an anchor attachment device that is compact and has good operability.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a seat belt to which the device of the present invention is attached, and FIG. 2 is a perspective exploded view of the device of the present invention.
Figure 3 is a cross-sectional side view seen from direction A in Figure 1;
The figure is a sectional view taken along the line B-B in Figure 3, Figure 5 is a view similar to Figure 4 showing the operating state, Figures 6a and b are developed views showing the relationship between the cam groove and the latch piece, and Figure 7 8 and 8 are developed views showing modified examples of the cam groove shape, respectively. 20...notch, 12...adjust base,
13... Adjustment anchor, 14... Latch piece, 43... First engagement surface, 44... Second engagement surface, 15... Release shaft, 41... Cam groove.

Claims (1)

[Scope of Claims] An adjusting base having a plurality of engaging parts arranged in pairs, a front part guided along the adjusting base and to which an anchor plate is attached, and a pair of side walls extending from the front part. an anchor member having a pair of rear portions extending from the side wall and formed to surround the adjuster base; a pair of leg-shaped parts that are movably attached to the anchor member and are accommodated in a mounting hole formed in a front part of the anchor member and a guide part formed in a back part of the anchor member, and a connecting part that connects the leg-shaped parts to each other; a latch piece having a latch piece, a biasing means for biasing the latch piece in the direction of the engaged position, and a first engagement member for engaging the latch piece and guiding the latch piece to the disengaged position when operated. and a second engaging means that is located on the disengaged position side of the latch piece in the engaged position and abuts to prevent the latch piece from moving to the disengaged position. Anchor attachment device. 2. The anchor attachment device according to claim 1, wherein the first engagement means and the second engagement means extend in different directions.