JPS6198203A - Buckle of safety belt - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a push-button safety belt buckle used in automobiles, aircraft, etc. This invention relates to a seat belt buckle designed to perform the following steps.

[Technical background of the invention and its problems]

Generally, when a buckle of a safety belt is inserted, the latch engages with the latch engagement hole of the tongue and is locked by inserting the tongue into the buckle body, thereby preventing the tongue from coming out.

In this type of seat belt buckle, the tongue is prevented from engaging in a false latch with the buckle body,
Once the tongue is fully inserted and locked, the latch engagement of the tongue will not be released even if the buckle is hit, and the tongue can be held in the locked state fm, and furthermore, the push button The problem has been how to configure the latch so that the tongue can be released from the latch by operating it with a light force. In addition, conventional safety belt buckles have a very complex mechanism and a large number of parts, making it difficult to assemble the buckle and resulting in high costs.

[Purpose of the invention]

This invention takes the above-mentioned points into account, and has a small number of parts, a simple internal structure, and easy assembly. It also prevents false latch engagement of the tongue, and allows the latch engagement and release of the tongue to be performed using a push button. To provide a buckle for a safety belt which can be easily and reliably operated.

(Summary of the Invention) In order to achieve the above-mentioned object, the buckle for a safety belt according to the present invention includes a base having a horizontal plate portion and a side plate portion whose both sides are cut and raised substantially vertically; a latch whose ears are inserted into support holes formed in the plate part and supported so as to be movable between a release position and a lock position; A locking spring attached to the base, a push button whose ear shaft is rotatably attached to the front end of both side panels of the base, and a push button inserted along the upper surface of the base and engaged with the latch. It has a tongue to be locked and a push-out spring in the form of a flat bar provided on the horizontal plate portion of the base for pushing out the tongue, and the push button is spring-loaded to the return position side by the locking spring. The latch has an engaging protrusion which is biased and retainable at the front end of the latch, and which, when the push button is pressed, swings the latch into the release position against the force of the lockout spring. It was made to move.

[Embodiments of the invention]

An embodiment of the safety belt buckle according to the present invention will be described with reference to the accompanying drawings.

Figures 1 and 2 are perspective views showing essential parts of a buckle for a safety belt according to the present invention, and reference numeral 10 in the figures indicates the buckle body of the buckle for a push-button safety belt. The buckle main body 10 has a base 11, and a plate-shaped horizontal plate portion 12 is formed in the center of the base 11. Both sides of the horizontal plate portion 12 are cut and raised substantially vertically to form side plate portions 13°13.

Support holes 14 are formed opposite to each other in front of the intermediate portion of the side plate portion 13, and a latch 16 is interposed in the support holes 14. The latch 16 is supported within the support hole 14 so as to be swingable between a tongue release position and a lock position.

As shown in FIGS. 3 and 4, the latch 16 is constructed by integrally molding a base plate portion 17 and a balance weight portion 18 into a substantially dogleg shape.
A concave portion projecting downward is formed in the center portion of 7, and this concave portion is configured as a latch pawl 19. A positioning engagement hole 20 is bored approximately in the center of the recess, while ears 21 are integrally molded at both ends of the base plate portion 17, and these ears 21 support the base 11 described above. It is inserted into the hole 14 and supported on both sides. At that time, both ears 2
(The ear axis (swing center line) CL connecting the two parts is adjusted by the balance weight part 18 so that it passes through the center of gravity of the latch 16. By passing the ear axis CL of the latch 16 through the center of gravity, an impact load is applied to the base 11. Even if the voltage is applied, the latch 16 is hardly affected by the negative effect.

The latch 16 has a locking spring 23 shown in FIG.
As a result, it is held on the base 11 so as to be always spring-biased toward the lock position. The locking spring 23 is the second
As shown in FIGS. 3, 3, and 5, the spring plate is integrally formed by molding a spring plate, and has side locking portions 24 that lock into support holes 14 in both side plate portions of the base. The side locking portion 24 has locking claws 24a that project laterally and upwardly, and the locking claws 24a are engaged with the upper engagement grooves 148 of the support hole 14 to be positioned. The locking portions 24 on both sides are connected by a locking spring portion 25 . This lock spring portion 25 is curved downward in an arc shape, and a positioning protrusion 26 is formed in the center thereof to protrude downward. It is always spring biased towards the position side. At this time, the engagement restricts the movement of the latch 16 in the front-rear direction.

Further, a return spring portion 27 extends forward and upward from the center of the lock spring portion 25 of the lock spring 23.

The spring force of the return spring portion 27 is adjusted by a window hole 28a formed on the base side and a bulge portion 28b, while the spring force of the return spring portion 27 is adjusted by a window hole 28a formed on the base side
8b, the base side and the tip fH1a11 are punched out on the window hole side, and the connection state is severed.

Further, the return spring portion 27 is connected to a push button 3 which will be described later.
0, and is constantly biased upward by a spring so as to return this push button 30 to its return (original) position.

As shown in FIGS. 3 and 6, the push button 30 is integrally molded from a resin material (or a metal material may be used), and its front end is reinforced with a thick portion formed in the width direction.

A pair of ear shafts 31 that protrude laterally are integrally molded on both sides of the front end of the push button 30.
As shown in FIG. 1, it is rotatably engaged with a pair of engagement grooves 32 formed in the front end portions of the base side plates 13. The ear shaft 31 may be made of a material different from that of the push button 30, such as a metal material. In this case, the ear shaft 31 may be integrally formed by press-fitting the ear shaft 31 into both sides of the front end of the push button 30. Although the ear shaft 31 is formed in a cylindrical shape, a notch 31a may be formed in the ear shaft 31.

Further, the engagement groove 32 has the same opening at the front, and the push button 30 is attached and detached from this opening. Engagement groove 32
The push button 30 held by the push button 30 is supported on the guide inner support protrusion 33. The inner support protrusion 33 is located opposite to the lower part adjacent to the engagement groove 32, and is formed by bending the front end protrusion of the base inward. The support protrusion 33 has an upper surface that serves as a support surface that supports the ear shaft 31, and a lower surface that serves as a guide surface that guides the insertion of a tongue 38, which will be described later. At that time, support the ear shaft 31;
If the supporting surface of the engaging groove 32 has a curved surface structure corresponding to the lug @31, the lug shaft 31 can be easily assembled at the time of assembly.

Furthermore, an engaging protrusion 34 is integrally formed on the proximal side of the push button 30 so as to bulge out. This engagement protrusion 34 engages with the front end (balance weight part) of the latch 16 from above, and when the push button 30 is pushed down, the balance weight part 18 of the latch 16 is pushed down and the latch 16 is held in the release position. It's about to come.

By the way, the horizontal plate portion 12 of the base 11 and the latch 1
6 and locking spring 23, guide support protrusion 3
A guide path 39 for guiding the insertion of the tongue 38 is formed between the tongue 38 and the tongue 38, and the tongue 38 is taken in and out through this guide path 39.

As shown in FIGS. 1 and 2, the tongue 38 has a latch engagement hole 4o that can be engaged with the latch 16, and a mounting hole 41 that is attached to the webbing of a safety belt. Tongue 3
8 from the front of the buckle body 10 and inserting it along the guide path 39, the insertion end of the tongue 38 pushes open the base plate portion 20 of the latch 16 against the spring force of the spring member 25, By further inserting the tongue 38 from this state, the latch 16 engages with the latch engagement hole 40 by the spring action of the locking spring 23, and the tongue 38 is locked and completely latched.

This restricts the tongue 38 from being pulled out.

Further, as shown in FIGS. 2 and 3, a push-out spring 43 in the form of a flat bar spring is provided on the base horizontal plate portion 12 of the buckle body 10. As shown in FIGS. The push-out spring 43 is generally shaped into a 7-shape, and the surface of the spring is preferably coated with a resin material to prevent the generation of sliding noise when the push-out spring 43 is deformed. The rear end of the push-out spring 43 engages with an engagement protrusion 44 cut and raised in the rear central part of the base horizontal plate portion 12.
4 is supported. A guide protrusion 4 is provided on the side of the engagement protrusion 44.
5 is integrally molded, and this guide protrusion 45 prevents the push-out spring 43 from popping out.

On the other hand, at the tip of the push-out spring 43 is a curved portion 46 that can be engaged to embrace the tip of the tongue 38.
is formed. This curved part 46 is always inserted into the gap formed between the base horizontal plate part 13 and the latch 16, and prevents the tongue 38 from engaging in a false latch, and also prevents the push-out spring 43 from lifting up. are doing.

Further, after the buckle main body 10 is assembled, it is covered with a cover 48. The cover 48 is constructed as shown in FIGS. 3, 7 and 8, and has a push button 30 on the top.
It has an opening 49 for pressing.

A guide column 50 is suspended from the front top of this frontage 49. This guide column 50 guides through the guide hole 51 of the push button 30 and the window hole 29a of the locking spring 23. A webbing attachment hole 52 is formed in the rear end of the cover 48, and the seat belt webbing (not shown) is attached by passing through this attachment hole 52 and the attachment hole 53 of the base 11.

Furthermore, a guide surface 55 for guiding the free end of the push button 30 is formed inside the cover 48 . This guide surface 55 corresponds to the shape of the tip of the push button 30,
A slide guide surface 56 facing the base horizontal plate part 13 is formed at the lower end of the cross section, and both sides of the push-out spring 43 are formed between the guide surface 56 and the horizontal plate part 13. is interposed, and the slide by the spring deformation of the push-out spring 43 is guided.

Next, the function of the buckle of the push-button safety belt will be explained with reference to FIG.

Before inserting the tongue 38 into the buckle body 10, the buckle is held as shown in FIG.
The push button 3° is held at the return (original) position by the spring force, and the held push button 3° is maintained at the original position by the stopper portion of the cover 48. On the other hand, the latch 16 has 7 locking springs 2" 3f7).
] Yo□ Yoyo. 7ui.

Spring biased on all four sides to hold it in place. At this time, the tip curved portion 46 of the push-out spring 43 is inserted into the side gap between the latch 16 and the base horizontal plate portion 13.

When the tongue 38 is inserted along the guide path 39 of the buckle main body 10 from the state not shown in FIG.
is pushed up toward the release position against the spring force of the lock spring portion 25 of the lock spring 23, and the tongue 38 can be further inserted into the husband, and the tip of the tongue 38 is pushed up against the tip curved portion 46 of the push-out spring 43. engage with. From this state, the tongue 38 is further inserted against the spring force of the push-out spring 43, and when the latch engagement hole 40 is inserted to the position corresponding to the latch 16, the latch 16 is inserted into the lock spring portion of the lock spring 23. The latch claw 19 of the latch 16 is pushed toward the lock position by the spring force of the latch 16, and the latch claw 19 of the latch 16 engages with the latch 7L41CI8L1. ＞Tsu, 8. Yo. 8□
. 51, the tongue 38 is fully latched;
While false latching engagement is prevented, its pumping out is reliably and completely prevented. Also, attach the tongue 38 to the buckle body 1.
0, the latch 16 is always biased toward the lock position by the locking spring 23, so if the tongue 38 is inserted by a predetermined amount, the tongue is securely locked and pseudo latch engagement is prevented. completely and completely prevented. When the tongue 38 is in the pseudo-latched state, the tongue 38 is pushed forward by the spring force of the push-out spring 43 and is not maintained in this state.

When pulling out the tongue 38 from the locked state (fully latched state) shown in FIG. 9(B), push the push button 30 down against the spring force of the return spring portion 27 of the locking spring 23. . By pressing down this push button 30, the push button 30 is moved to the ear shaft 3.
The engaging protrusion 34 of the push button 30 presses down the balance weight part 21 of the latch 16 with a large force by the principle of leverage, and the latch 16 is pushed down by the locking spring part 25.
against the spring force, rotate it toward the release position as shown in FIG. 9(C). By this rotation of the latch 16, the engagement between the latch pawl 19 of the latch 16 and the latch engagement hole 40 of the tongue 38 is released, and the tongue 38 is released.
It pops out and is easily extracted.

In this case, the latch 16 is attached to the side plate 1 of the base 11.
The swing center axis CL is located in the support hole 14 of No. 3 with the latch 16.
The base body 1 is supported so that it passes through the center of gravity of the base body 1.
Even if a large impact load is applied to the latch 16, the impact load does not automatically rotate the latch 16 to the release position side, and the latch 16 is not affected by the negative effects of the impact load.

Next, a modification of this invention will be explained with reference to FIG. 11.

The safety belt buckle shown in this modification differs only in the shape of the engagement groove 32A at the front end of the base 11 that engages with the ear 31 of the push button 30, and other members are explained in one embodiment. Since it is the same as that described above, the same reference numerals are given and the explanation will be omitted.

That is, what is shown in this modification is the engagement groove 32A.
opens obliquely downward in front, and push button 3 is inserted through this opening.
0 ear shaft 31 can be inserted therein. At this time, diametrically opposed notches 60 are formed along the axial direction in the ear shaft 31, and the push button 30 can be easily attached and detached by this notch. Engagement groove 32
The groove width of the insertion side opening of the push button 30 of A is set so that it corresponds to the notched ear shaft 31, and prevents it from popping out at the upper (or lower) part of the insertion side opening of the engagement groove 32A. A protrusion 61 is formed. At that time, the notch 6 of the ear shaft 31
0 is formed so that when the push button 30 is inserted, mounted in a predetermined position, and rotated, it forms a nearly vertical plane.

As a result, the attached push button 30 is prevented from being pulled out or flying out.

When the push button 30 is to be pulled out, it can be easily pulled out by rotating it approximately 90 degrees around the ear axis, holding it in this rotated state, and pulling it forward.

In general, the push-out spring is not limited to the shape shown in FIG. 3, but may be formed in a modified 7-shape as shown in FIGS. 12 and 13. The push-out spring 43A shown in FIG. 12 has a curved portion 62 formed at one corner of a figure 7 shape, and this curved portion 62 allows the push-out spring 43A to have a reservoir.

The push-out spring 43B shown in FIG. 13 has curved portions 63 and 63 formed at two corner portions of a double-shape. As shown in FIG. 14, the push-out spring 64 may contact and engage the tip of the tongue 38 so as to grip it from both sides.

In this case, it is desirable to form guide protrusions 45 on both sides of the base horizontal plate portion 13.

(Effects of the Invention) As described above, the safety belt buckle according to the present invention basically includes a base, a tongue, a latch,
Consisting of a locking spring, push-out spring, and push button, the number of parts is very small, making the structure simple, easy to assemble, and inexpensive! It can be easily manufactured and is economical.

In addition, since the push-out spring is constructed of flat bar springs in an approximately figure-7 shape, it does not require space in the height direction and can be stored effectively using the put-out space on the horizontal plate of the base. There is no need to increase the size of the safety belt buckle, and the safety belt can be made smaller and more compact. Furthermore, since the locking spring always biases the latch toward the locking position, when the tongue engaging hole of the tongue is inserted to the corresponding position of the latch, it is securely locked by the pressing action of the spring force, and At this time, the spring force of the push-out spring pushes it forward, so that false latch engagement is reliably prevented.

Furthermore, when handling the tongue, simply press the push button and the lever principle will smoothly guide the latch to the release position against the force of the locking spring, ensuring that the tongue is The tongue is released and pushed out by the spring force of the push-out spring, allowing the tongue to be easily pulled out.

In addition, if the latch pivot axis supported by the support hole formed in the side plate of the base passes through the Φ center of the latch, even if a large impact load is applied to the buckle,
The latch is not brought to the release position by this W impact load and is not adversely affected by the impact load.

Furthermore, since the push button is supported by the ear shaft in the engagement groove at the front end of both side panels of the base, the support structure of the push button is simplified, and an engagement protrusion for latch engagement is formed on the abdomen of the push button. There is no need to form a push button mounting part or a latch engagement protrusion on the locking spring, the structure of the locking spring is simplified, and complicated entanglement of the springs with each other during assembly can be effectively prevented.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the safety belt buckle according to the present invention, with the cover removed; FIG. 2 is a perspective view of the buckle shown in FIG. 1 with the push button removed; FIG. 3 is an exploded perspective view of the buckle of the safety belt of the present invention, FIG. 4 is a perspective view of a latch incorporated in the buckle, FIG. 5 is a perspective view of a locking spring incorporated in the buckle, and FIG. Figure 6 is a side view of the push button, Figure 7 is a bottom view of the buckle cover, Figure 8 is a sectional view taken along the line ■-■ in Figure 7, and Figure 9 is a side view of the push button.
Figures (A>, (B) and (C) are simplified diagrams showing the operation of attaching and detaching the buckle of the safety belt according to the present invention, Figure 10 is a perspective view showing state B- in which the latch is engaged with the buckle, 1
Figure 1 shows a modification of the invention, Figures 12 to 14.
The figure is a perspective view showing a first modification to a third modification of the push-out spring. ('10...buckle body, 11...base, 12
...1".., 1301.□4.14-41□,
16-6゜latch, 17... base plate part, 18...
...Balance weight part, 21...Ear part, 23...
Locking spring, 24... Side locking part, 25...
・Lock spring part, 27...Return spring part, 30...
・Push button, 31...ear shaft, 32.32A...
- Engagement groove, 33... Inner support protrusion, 34... Engagement protrusion, 38... Tang, 39... Guide path, 43.4
3A, 43B, 64...Push-out spring,
46... Curved portion, 48... Cover, 60... Notch, 61... Projection for preventing protrusion. Applicant's agent Hatano, long time no see

Claims (1)

[Scope of Claims] 1. A base having a horizontal plate portion and side plate portions cut and raised substantially vertically on both sides, and an ear portion inserted into a support hole formed in both side plate portions of this base to a released position. a locking spring attached to the base so as to constantly bias the latch toward the locking position; and front ends of both side plates of the base. a push button having an ear shaft rotatably attached to the push button; a tongue inserted along the upper surface of the base and locked by engaging with the latch; and a horizontal plate of the base for pushing out the tongue. The latch is biased toward the return position by a push-out spring in the form of a flat bar spring provided on the latch and the locking spring, and has an engaging protrusion that can be engaged with the front end of the latch. A buckle for a safety belt, wherein the protrusion is configured to swing the latch to a release position against the spring force of a locking spring when a push button is pressed. 2. The push-out spring is formed almost in a Z-shape, and the tip of the spring is formed with a curved portion that can be engaged to embrace the tip of the tongue, and this curved portion is formed between the base horizontal plate portion and the latch. The safety belt buckle according to claim 1, which is inserted into the safety belt buckle to prevent false latch engagement of the tongue. 3. A cut and raised engagement protrusion is formed in the rear central part of the base horizontal plate part, and a guide protrusion is provided on the side of this engagement protrusion, and the push-out spring is formed by the engagement protrusion and the guide protrusion. A buckle for a safety belt according to claim 1 or 2, wherein the buckle is adapted to receive a rear end portion of a spring. 4. The base is covered with a cover from above, and the cover has slide guide surfaces formed on both sides facing the horizontal plate portion of the base to guide the sliding movement of the push-out spring. Safety belt buckle as described in. 5. Engagement grooves opening forward or obliquely downward are formed in the front ends of the base side plate portions to face each other, and the ear shaft of the push button is supported in the engagement grooves. Safety belt buckle as described in section. 6. Inner support protrusions bent inward are installed opposite to each other adjacent to the lower portions of the engagement grooves formed on the front ends of both side plates of the base. A buckle for a safety belt according to claim 5, on which a shaft is mounted. 7. The ear shaft of the push button is formed with diametrically opposed notches that extend in the axial direction, and the width of the insertion groove of the engagement groove is set to correspond to the notched ear shaft. A buckle for a safety belt according to claim 5. 8. The safety belt according to claim 1, wherein a pair of engagement protrusions are integrally molded on the abdomen of the push button, and the engagement protrusions are engaged with the front end side of the latch. buckle. 9. According to claim 1, the latch is swingably supported in the support holes of the side plate parts of the base, and is configured such that the swing center axis connecting the both ear parts passes through the center of gravity of the latch. Safety belt buckle as described. 10. The latch is constructed by integrally molding a base plate portion and a balance weight portion in a substantially dogleg shape, and a latch claw protruding downward is formed in the center portion of the base plate, as set forth in claim 1. Safety belt buckle as described. 11. The locking spring includes a side locking portion that is locked in the support hole on both side plates of the base, and a lock spring portion that connects the both side locking portions and biases the latch toward the lock position. and a return spring portion extending diagonally upward forward from the lock spring portion and returning the push button to its original position,
The buckle for a safety belt according to claim 1, wherein the lock spring portion has a positioning protrusion that engages with a positioning hole of the latch.