JPS641122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in buckles for seat belts for automobiles and the like.

As a conventional buckle for a seat belt for automobiles, etc., there is one shown in FIG. 1, for example.

However, in conventional seat belt buckles, in order to lock the tongue 1, the latch 3 is only urged to the engaged position by the latch spring 4, so if an impact is applied to the buckle due to an accident, etc. There was a drawback that the latch 3 was rotated to the disengaged position against the latch spring 4 due to the impact, and the engagement between the tongue and the buckle was released.

The present invention has been made in view of the above-mentioned problems, and includes a substantially channel-shaped buckle base, a latch rotatably supported on the buckle base, and a latch attached to the engagement position with the tongue. a latch spring that pushes the latch; an operating button that operates the latch to a position where it does not engage with the tongue against the latch spring; a holder that is fixed to the buckle base; A false latch prevention means and a dissociation prevention means are separately arranged side by side in the mating position and parallel to each other, and the false latch prevention means slidably fits the latch engaging portion into the holder via an eject spring. The dissociation prevention means is constructed by slidably fitting the first protrusion into the holder via a compression spring, and when the tongue and the latch are not engaged, the pseudo latch prevention means The latch engaging portion engages with the latch and prevents the latch from rotating to the engaging position with the tongue, and when the tongue and the latch are engaged, the first protrusion of the dissociation prevention means engages with the latch. This feature is characterized in that the latch is prevented from rotating to the non-engaged position.

Embodiments of the present invention will be described below based on the drawings. In FIGS. 2 to 6, reference numeral 1 denotes a tongue, and the tongue 1 has an engagement hole 1a in the front that engages with a tongue engagement part 3a of a latch 3, which will be described later, and a belt 1 in the rear.
It has an insertion hole 1c through which the hole 1c is inserted.

2 is a buckle base, and the buckle base 2 includes a bottom plate 2a, side walls 2b, 2b bent upward from the ends of the bottom plate 2a, and ears 2c, 2c bent inward from the ends of the side walls 2b, 2b. It has

Reference numeral 3 designates a latch, and the latch 3 has a tongue engaging portion 3a in the center and shaft pieces 3b, 3b on both shaft sides, and the shaft pieces 3b, 3b are fan-shaped formed on the side walls 2b, 2b. The latch 3 is rotatably supported on the buckle base 2 by being engaged with the holes 2d, 2d.

A latch spring 4 is fixed in front of a holder 7, which will be described later, and the latch spring 4 comes into contact with the lower surface of the latch 3 to constantly bias the latch 3 to the engaged position.

Reference numeral 5 designates a buckle cover, and the buckle cover 5 has protrusions 5b, 5b inside the left and right side walls 5a, 5a, and the protrusions 5b, 5b are connected to the side walls 2b, 2.
It is fixed to the buckle base 2 by engaging with the holes 2e, 2e formed in the buckle base 2.b.

6 is a press button which is an operation button, and the press button 6 has shaft portions 6a, 6a on both sides of the front end, and the shaft portions 6a, 6a are attached to the side wall 5 of the buckle cover 5.
The buckle cover 5 is rotatably attached to the buckle cover 5 by being engaged with the shaft grooves 5c, 5c of the buckles a, 5a. Further, on the rear lower surface of the press button 5, there is a pressing protrusion 6b that comes into contact with the protruding piece 3c of the latch 3.
Then, an operating protrusion 6c is formed which comes into contact with a second protrusion 9b of the dissociation prevention means 9, which will be described later. Note that 6d is a torsion coil spring that always urges the press button 6 upward, and the press button 6 can be pressed from the opening 5d in the center of the buckle cover 5. Further, the front wall of the buckle cover 5 is provided with a tongue insertion opening 5e.

7 is a holder, and the holder 7 has protrusions 7 on both sides.
a, 7a are the side walls 2b, 2 of the buckle base 2.
b is fixed to the buckle base 2 by engaging with elongated holes 2f, 2f provided at the rear end.

Reference numeral 8 denotes pseudo-latch preventing means, and the pseudo-latch preventing means 8 is constructed by extending the distal end of the slider 8a toward the latch 3.
It forms b. Further, the false latch prevention means 8 has the latch engaging portion 8b protruding from a guide groove 7b formed in the holder 7, and is attached to be slidable along the guide groove 7b. Further, the false latch prevention means 8 is always urged forward by an eject spring 8c interposed between the holder 7 and the rear wall 7c.

9 is a dissociation prevention member, which has a first protrusion 9a on the front;
A second projection 9b having a cam surface 9c behind the first projection 9a, and a guide projection 9d behind the second projection 9b.
has been established. Further, 9e is a side wall that integrates the first protrusion 9a and the second protrusion 9b. Note that the holder 7 is inserted into the U-shaped groove 9f of the first protrusion 9a.
The dissociation prevention member 9 is slidably attached to the holder 7 by the rear protrusions 7d and the rear protrusions 7e entering the U-shaped grooves 9g of the id protrusions 9d. It is always urged forward by a compression spring 9h interposed between the rear wall 7c and the rear wall 7c. Note that the projection 9i of the side wall 9e and the projection 7f of the holder 7 come into contact with each other, thereby restricting forward sliding.

Next, the action of the above-mentioned buckle will be explained.
First, in the state of the latch 3 before the tongue is inserted as shown in FIGS. and is held downward. On the other hand, the front end of the first protrusion 9a of the release prevention member 9 is in contact with the rear end 3d of the latch 3.

From this state, when the tongue 1 is inserted into the inside of the buckle through the tongue insertion opening 5e, the tongue 1 advances without interfering with the latch 3 and comes into contact with the tip of the latch engaging portion 8b of the false latch prevention means 8. When the tongue 1 is further pushed in, the eject spring 8c contracts and the false latch prevention means 8 moves rearward, causing the latch engaging portion 8b and the tongue engaging portion 3 to move backward.
When the contact with a is released, the latch spring 4
The latch 3 is thereby pivoted into the engaged position. However, since the ejection spring 8c is formed to be stronger than the latch spring 4, if the tongue 1 is not inserted to the position where the tongue engaging portion 3a and the engaging hole 1a engage, the tongue 1 will be forced to the eject spring. 8c through the latch engagement portion 8b. The tongue 1 is the tongue engaging portion 3a
When the latch 3 is inserted to a position where the latch 3 and the engagement hole 1a engage with each other, the tongue engagement portion 3a of the latch 3 enters the engagement hole 1a by the latch spring 4, thereby locking the tongue 1. Further, at the same time as the latch 3 is rotated to the engagement position, the first protrusion 9a of the dissociation prevention member 9 projects downwardly from the latch 3 due to the spring force of the compression spring 9h (FIG. 5).

In this state, if an impact is applied to the buckle, the lower surface of the latch 3 and the upper end of the first protrusion 9a are prevented from rotating to the non-engaging position due to the impact.

Note that to remove the tongue 1, press the press button 6. When the press button 6 is pressed, the working protrusion 6c of the press button 6 first comes into contact with the cam surface 9c of the second protrusion 9b of the dissociation prevention member 9, and the dissociation prevention member 9 moves backward against the compression spring 9h. Moving. After the first protrusion 9a of the dissociation prevention member 9 moves to the outside of the rotation radius of the latch 3, the pressing protrusion 6b of the press button 6 comes into contact with the protruding piece 3c of the latch 3, and the latch 3 resists the latch spring 4. Rotate to the disengaged position. Tongue engaging portion 3a and engaging hole 1
When the tongue 1 is disengaged from the tongue 1a, the tongue 1 is pushed through the slider 8a by the restoring force of the eject spring 8c and is ejected forward from the buckle, and the latch engaging portion 8b engages the tongue engaging portion 3a. By moving above the tongue engaging portion 3a and coming into contact with the upper surface of the tongue engaging portion 3a, the latch 3 is held in the non-engaging position against the latch spring 4.

As described above, in the above embodiment, when an impact is applied to the buckle when the tongue and the buckle are engaged, the latch rotates to the disengaged position due to the impact, which is the first step of the dissociation prevention member. Since the protrusion prevents the tongue from coming off the buckle, there is no risk of it coming off.

Next, FIGS. 7 to 11 show other embodiments of the present invention.

The difference between the first embodiment and this embodiment is that a slide button is used as the operation button. Incidentally, in the description of this embodiment, in cases similar to those of the first embodiment, the same reference numerals are given and the explanation thereof will be omitted.

At the rear of the latch 3 is a curved piece 3 that curves upward.
It has d.

Further, at the rear of the slide button 10, a cam surface 10a that contacts the curved piece 3d and an operating projection 10b that contacts the vertical surface 9d of the second projection 9b of the dissociation prevention member 9 are provided, and the slide button 10 is provided with a buckle cover. 5 is slidably attached to the front opening 5f, and is always urged forward by a compression spring 10C.

Further, the buckle cover 5 is divided into two parts, an upper cover 5g and a lower cover 5h, each of which is fixed to the buckle base 2 with screws 11, 11.

Note that the holder 7 has protrusions 7f and 7 formed on the lower surface.
f is fixed to the buckle base 2 by engaging with holes 2g, 2g formed in the bottom plate 2a of the buckle base 2.

The action of the above-mentioned buckle will now be explained.

When the slide button 10 is slid backward against the compression spring 10c from the state in which the tongue 1 and the latch 3 are engaged in FIG. The member 9 moves rearward against the compression spring 9h. After the first protrusion 9a moves to the outside of the rotation radius of the latch 3, the cam surface 10a of the slide button 10
contacts the curved piece 3d, rotates the latch 3 to the disengaged position against the latch spring 4, and the engagement between the tongue 1 and the latch 3 is released.

12 to 14 show other embodiments of the present invention. The biggest difference from the buckles of the first and second embodiments is that the tongue engaging portion 3a of the latch 3 bulges downward.

In describing this embodiment, the same reference numerals are given to the same cases as in the first embodiment and the second embodiment, and the explanation thereof will be omitted.

The buckle base 2 is provided with ears 2c, 2c at the rear.

The latch 3 has a tongue engaging portion 3a that bulges downward.
A pair of wings 3e, 3e are formed above, and the shaft pieces 3b, 3b are attached to the side wall 2 of the buckle base 2.
By engaging with fan-shaped holes 2d, 2d of b, 2b, it is rotatably supported.

The coil spring is a latch spring 4, and the ends of the latch spring 4 abut against the upper ends of the wings 3e, 3e of the latch 3, always urging the latch 3 downward.

In addition, the slide button 12 has a sliding surface 12 at the rear.
a, 12a and cam surfaces 12b, 12b, one of the inclined pieces 12c is provided with an operating protrusion 12d, and the slide button 12
The sliding surfaces 12a, 12a of the buckle base 2
By coming into contact with the upper surfaces of the ears 2c, 2c,
Slide button 12 is slidably mounted.

The latch engaging portion 8b of the false latch prevention means 8 is
It is formed adjacent to the bottom plate 2a of the buckle base 2. On the other hand, the first protrusion 9a of the dissociation prevention member 9 is arranged at some distance from the bottom plate 2a.

When the tongue and the latch are engaged in the above-mentioned buckle, the latch engaging portion 8b of the false latch prevention means 8 projects below the latch 3, and the latch 3 is held upward against the latch spring 4. (Figure 14a). Further, the first protrusion 9a of the dissociation prevention member 9 is in contact with the end 3d of the latch 3 (FIG. 14b).

When the tongue 1 is inserted from the tongue insertion opening 5e in this state, the tongue 1 advances below the latch 3 without interfering with the latch 3, and the tongue 1 comes into contact with the tip of the latch engaging portion 8b. When the tongue 1 is further pushed in, the eject spring 8c contracts and the false latch prevention means 8 moves rearward. When the tongue 1 reaches the position where it engages with the tongue engaging portion 3c of the latch 3, the latch 3 moves to the latch spring 4.
By rotating clockwise in the figure and fitting the tongue engaging portion 3a into the engaging hole 1a,
Tongue 1 is locked. Also, at the same time as the latch 3 rotates clockwise, the first release prevention member 9
The projection 9a projects above the latch 3 (FIG. 14c). In this state, an impact is applied to the buckle, and the latch 3 rotates counterclockwise against the latch spring 4 due to the impact, because the upper surface of the latch 3 and the lower surface of the first protrusion 9a come into contact with each other. It is prevented.

To remove the tongue 1, slide the slide button 12 backward. When the slide button 12 is slid backward, the working projection 12d and the first projection 9a first come into contact with each other, and the dissociation prevention member 9 moves backward against the compression spring 9h. After the first protrusion 9a moves outside the rotation radius of the latch 3, the cam surfaces 12b, 12b of the inclined pieces 12c, 12c of the press button 12 and the ends 3f, 3f of the wings 3e, 3e come into contact with each other, and the latch spring 4, the latch 3 rotates counterclockwise. Tongue engaging portion 3a and engaging hole 1
When the tongue 1 is disengaged from the buckle a, the tongue 1 is ejected forward of the buckle via the false latch prevention means 8 by the restoring force of the eject spring 8c.

In the present invention, since the dissociation prevention member is arranged rearward from the pivot shaft of the latch, the first protrusion is made to protrude in the direction opposite to the direction in which the tongue engaging part bulges when the tongue and the latch engage. Needless to say, in the case of protruding further forward, the tongue engaging portion should protrude in the bulging direction.

As described above, the present invention separately arranges the false latch prevention means and the dissociation prevention means in parallel and in the engagement position of the latch and the tongue in the holder fixed to the buckle base, and the false latch prevention means The means includes a latch engaging portion slidably fitted into the holder via an eject spring, and the dissociation preventing means includes:
The first protrusion is slidably fitted into the holder via a compression spring, and when the tongue and latch are not engaged, the latch engaging portion of the false latch prevention means engages with the latch. , prevents the latch from rotating to the engagement position with the tongue, and when the tongue and the latch are engaged, the first protrusion of the dissociation prevention means engages with the latch and moves the latch to the non-engagement position. Since rotation can be prevented, the false latch prevention means can be operated reliably when the tongue and latch are disengaged, and the dissociation prevention means can be operated reliably when the tongue and latch are engaged, thereby ensuring safety. can significantly improve performance.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view showing a conventional seat belt buckle, FIG. 2 a is an exploded perspective view of the seat belt buckle according to the present invention, FIG. 2 b is a detailed view of the dissociation prevention member, and FIG. A plan sectional view of the buckle, Fig. 4a is a XX sectional view before the tongue is inserted, Fig. 4b is a Y-Y sectional view before the tongue is inserted, and Fig. 5 is an XX sectional view after the tongue is inserted. , FIG. 6 is a Y-Y sectional view after the press button is pressed, FIG. 7 is an exploded perspective view of a seatbelt buckle according to another embodiment, FIG. 8 is a detailed view of the dissociation prevention member, and FIG. 9 is a plan sectional view of the buckle, and Figure 10 is the X after inserting the tongue.
-X sectional view, FIG. 11 is an XX sectional view after sliding the slide button, FIG. 12 is an exploded perspective view of a seatbelt buckle according to another embodiment of the present invention, and FIG. 13 is a plane view of the buckle. 14 is a sectional plan view showing the action of the buckle, a is a Y-Y sectional view before the tongue is inserted, b is an XX sectional view before the tongue is inserted, and c is an X-X after the tongue is inserted. The sectional view d is the XX sectional view after the slide button has been slid. 2... Batsukuru base, 3... Latch, 4...
Latch spring, 6, 10, 12...operation button, 8...pseudo latch prevention means, 9...dissociation prevention member.

Claims (1)

[Claims] 1: a substantially channel-shaped buckle base; a latch rotatably supported on the buckle base; a latch spring that biases the latch to a position where it engages with a tongue; a holder fixed to the buckle base, and a false latch prevention means and a dissociation prevention means arranged in parallel in the engagement position of the latch and the tongue in the holder, respectively. The false latch prevention means is constructed by slidably fitting the latch engaging portion into the holder via an eject spring, and the dissociation prevention means is comprised of a compression spring disposed within the holder. The first protrusion is slidably fitted through the latch, and when the tongue and latch are not engaged, the latch engaging portion of the false latch prevention means engages with the latch and prevents the latch from engaging with the tongue of the latch. rotation to the engaged position is prevented, and when the tongue and the latch are engaged, the first protrusion of the dissociation preventing means engages with the latch to prevent the latch from rotating to the non-engaged position. A buckle for seat belts that is characterized by: