JPS6342805Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seat belt buckle for a seat belt device used in seats of various vehicles.

As a buckle for a seat belt, the present applicant has previously proposed a seat belt buckle that incorporates false latch prevention means in order to prevent false latching between the tongue and the buckle. An example of this will be explained with reference to FIGS. 1 to 4. Reference numeral 1 denotes a tongue, and the tongue 1 has a lock hole 1a that engages and disengages with a tongue engaging portion of a latch, which will be described later.
It is attached to the end of belt 1b. 2 is a buckle base, which has a bottom plate 2a, side walls 2b, 2b bent upward from both side edges of the bottom plate 2a, and ears 2c, 2c bent inward from the ends of the side walls 2b, 2b. . Reference numeral 3 denotes a latch, which has a tongue engaging portion 3a at the center and shaft pieces 3b, 3b on both sides, and fan-shaped holes 2d, 2d formed in the side walls 2b, 2b.
It is rotatably attached to the buckle base 2 by engaging with the buckle base 2. Reference numeral 4 denotes a latch spring held on the front side of the holder, which will be described later, which comes into elastic contact with the lower surface of the latch 3 and constantly urges the latch 3 to the engaged position. 5 is a buckle cover, which includes an upper cover 5a and a lower cover 5b.
It is divided into two parts, each of which is fixed to the buckle base 2 with screws 13. Reference numeral 10 designates a release button, which is provided on the rear side with a cam surface 10a that comes into contact with a bending arm 3c of the latch 3, and an operating projection 10b that comes into contact with a vertical surface 11c of a second projection 11b of a dissociation prevention means to be described later. The release button 10 is slidably attached to the opening 5c in front of the buckle cover 5, and is always urged forward by a compression spring 10c. Reference numeral 7 denotes false latch prevention means, which is composed of a holder 8 and a slider 9. The holder 7 is attached by engaging a projection 7a formed on the lower surface with a hole 2e formed in the bottom plate 2a of the buckle base 2. The slider 9 is slidably disposed in a guide groove 7b formed in the holder 7, and is always urged forward by an eject spring 9b. In addition, 11 is a dissociation prevention member, and a first protrusion 11 is provided at the front.
a, and a second protrusion 11b having a vertical surface 11c behind the first protrusion 11a. It is biased forward.

According to the buckle having the above structure, in the state before the tongue is inserted, the latch 3 is attached to the tongue engaging portion 3a.
The upper surface of the slider 9 and the lower surface of the tip of the slider 9 of the false latch prevention means 7 are in contact with each other and are held downward against the latch spring 4. On the other hand, the front end of the first protrusion 11a of the dissociation prevention member 11 is in contact with the rear end 3a of the latch 4. From this state, insert tongue 1 into insertion slot 5.
When the tongue 1 is inserted into the interior from the point d, the tongue 1 advances without interfering with the latch 3 and comes into contact with the tip of the slider 9 of the false latch prevention means 7. And more tongue 1
When pushed in, the eject spring 9b contracts and the slider 9 moves backward, and when the tip of the slider 9 and the tongue engaging portion 3d are released from contact, the latch 3 is moved to the engaged position by the latch spring 4. Rotate to. Here, the eject spring 9b has a stronger spring force than the latch spring 4, so that the tongue 1 is connected to the tongue engaging portion 3a and the lock hole 1a.
If the tongue 1 is not inserted to the position where it engages, the tongue 1 will be ejected by the force of the eject spring 9b. When the tongue 1 is inserted to the position where the tongue engaging part 3a and the lock hole 1a engage, the tongue engaging part 3a enters the lock hole 1a by the latch spring 4 and locks the tongue 1. This prevents false latch of the tongue 1. Note that the first protrusion 11a of the dissociation prevention member 11
protrudes downward from the latch 3 due to the force of the spring 12, and even if the latch 3 is rotated in the non-engaging direction due to some kind of impact, it comes into contact with the lower surface of the latch 3 and restricts its movement, thereby preventing illegal release of the lock. do.
Furthermore, when the release button 10 is pushed in against the force of the spring 10c when the lock is released, the working protrusion 10b first engages the second protrusion 11b of the dissociation prevention member 11.
The cam surface 10a then contacts the arm 3c and pushes down the latch 3 against the force of the latch spring 4, releasing the lock from the tongue 1.

By the way, in the slider 9 described above, the front side of the slider 9 cannot be entirely covered with the holder 8 in order to allow the tongue 1 to enter, and the front end of the slider 9 cannot be covered with the notch 8a on the front side of the holder 8. Since the slider 9 is exposed at the top and its tip protrudes beyond the front end of the holder 8 and receives the force of the latch spring 4 in a so-called overhang state, the slider 9 tends to float as shown by the chain line in FIG. It was confirmed that there was a risk of latching, malfunction, wear and tear.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a seatbelt buckle that can suppress the slider from floating and reliably prevent false latching.

Therefore, in the present invention, the pseudo-latch preventing means is provided with a floating preventing means for restraining the slider to the holder side and suppressing the floating of the slider when the slider and the latch are engaged.

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

That is, in the present invention, as shown in FIG.
A slider 9 is slidably disposed in a guide groove 7b of a holder 8 fixed to a buckle base 2a, and the slider 9 is always urged forward by a spring 9b, so that the bottom surface of the tip of the slider 9 is brought into contact with the top surface of the rear end of the latch 3. In a structure in which the latch 3 is held in the disengaged position against the force of the latch spring 4 by being engaged, a slider 9 is attached to the false latch prevention means 7 consisting of the holder 8 and the slider 9. A lifting prevention means 14 is provided for restraining the slider 9 to the holder 8 side and suppressing the lifting of the slider 9 when the slider 9 is engaged with the latch 3.

In this embodiment, this floating prevention means 14
As such, a guide protrusion 14a is integrally provided on the front surface of the base 9a of the slider 9 that abuts and engages with the front wall 8a of the holder 8, and a guide hole 14b for receiving the guide protrusion 14a is formed in the holder front wall 8a. However, the slider 9 is prevented from floating due to the engagement between the guide projections 14a and the guide holes 14b.

With the above structure, when the latch 3 is pressed down against the force of the latch spring 4 by operating the release button 10, the slider 9 slides toward the front side of the holder 8 by the force of the spring 10, pushing out the tongue 1, and the slider 9 The base 9a of the holder front wall 8
When approaching the guide hole 1, the guide protrusion 14a
4b, and when the base 9a contacts the holder front wall 8a and the tongue 1 is pushed out of the buckle, the protrusion 14a and the guide hole 14b are completely engaged, and the latch 3 is released from the lower surface of the tip of the slider 9. Hold the engaged position. In this state, a rotational force in the floating direction is applied to the tip of the slider 9 by the force of the latch spring 4, but since the guide protrusion 14a and the guide hole 14b are completely engaged, the slider 9 does not float. Thus, false latching can be reliably prevented.

As described above, according to the present invention, since it is possible to reliably prevent the slider from floating up, it is possible to further improve the prevention of false latching between the tongue and the latch, further increasing reliability, and the structure is simple. However, its practical effects are enormous.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a buckle equipped with a false latch prevention means which is the object of the present invention, Fig. 2 is a perspective view of the false latch prevention means of the same buckle, and Fig. 3 shows the locked state of the buckle and the tongue. A sectional view showing,
FIG. 4 is a cross-sectional view of the same unlocked state, FIG. 5 is a cross-sectional view showing the main part of the conventional structure, and FIG. 6 is a cross-sectional view showing the main part of the present invention. 1...tongue, 2...batsuru base, 3...
Latch, 4... Latch spring, 5... Buckle cover, 7... False latch prevention means, 8... Holder, 9... Slider, 10... Release button, 14... Lifting prevention means.

Claims (1)

[Scope of utility model registration request] a buckle base, a latch rotatably supported on the buckle base, a latch spring that urges the latch to an engaged position with the tongue, and a latch spring that urges the latch to a disengaged position with the tongue against the latch spring; a release button, a holder fixed to a buckle base, and a slider slidably disposed on the holder and engaging and disengaging from the end of the latch, the latch is latched when the latch and the tongue are disengaged. The structure includes a false latch prevention means that is held in a non-engaged position against a spring, and when the slider and the latch are engaged, the false latch prevention means restrains the slider to the holder side and prevents the slider from floating. A buckle for a seat belt, which is characterized by being equipped with a lifting prevention means that suppresses the lifting of the seat belt.