RU1837825C - Fastener for vehicle safety belt - Google Patents

Abstract

The inventive lock for a seat belt contains two interlocking parts, of which the detachable is made in the form of a tongue with an eyelet under the strap and a hole on the plug-in end, and the other, the receiving one, contains a U-shaped clip enclosed in a protective housing connected to a cable for securing the lock in the body, a U-shaped latch with a tooth mounted in a cage for interacting with the tongue hole and the hole made in the base of the cage, spring-loaded latch locks in the closed position and the ejector In the front of the cage, an additional stop is made for contacting the frontal part of the latch under extreme lock loads, and the end sections of the side of the latch are made in the form of paws symmetrically bent into the slots made in the side walls of the tail section of the cage 1. An additional emphasis is made in the form of two sections of the side walls of the holder bent at right angles, the free gap between them exceeding the width of the latch tooth, and the height of the gap between the base of the holder and the specified and sections exceed the thickness of the inserted end of the tongue. In addition, the support strut for holding the springs of the latch blocking body and the tongue ejector contains symmetrical protrusions located in the slots of the side walls of the cage and in contact with the tabs of the sides of the latch. In order to ensure one-to-one temporary abutment of the latch tooth in: the abutment edge of the hole at the base of the cage and the front of the latch against an additional stop under extreme load of the lock, corresponding gaps between the locking parts are provided of the same size. In addition, the sides of the latch are tapered tapering toward the legs, and the areas for engaging with the latch blocking body are in the form of symmetrical protrusions on its sides. 7 c.p. f-ly, 5 ill. (L 00 s XI 00 y u s

Description

The invention relates to passive safety of vehicles, and more particularly to the design of seat belt locks designed to protect drivers and passengers of vehicles

remedies for the grave consequences of traffic accidents by keeping them in the seat.

The purpose of the invention is to simplify the design and increase the reliability of the lock.

In FIG. 1 shows the proposed lock in the closed position, a longitudinal section; in FIG. 2 - the same plan view, the protective housing is completely removed; in FIG. 3 - clip of the castle, a perspective view; in FIG. A is a cross section AA in FIG. 2; in FIG. 5 - the main parts of the lock in interaction with extreme load, the remaining details are not shown.

The seat belt lock contains a U-shaped (in the form of a channel) clip 1 (Fig. 3). inside of which a U-shaped latch 2 is freely mounted, the sides 3 and 4 of which end with symmetrical tabs 5 and 6, bent at an angle a, located in the slot 7 of the side walls 8 and 9 of the cage.

The frontal part 10 of the latch 2 connecting the sides 3 and 4 is made with a tooth 11 bent forward by an angle ft corresponding to a friction angle with respect to the material interacting with the tooth of the part, namely, the insertion end 12 of the tongue 13, which is a removable part of the lock.

The tongue 13 comprises an eyelet 14 (not shown in the figures) under the shoulder strap and a rectangular hole 15 at the inserted end 12. The sides 3 and 4. The latches 2 are made tapering towards the bent tabs 5 and b to increase their elasticity. Symmetrical protrusions 16 and 17 (Figs. 1 and 2) are formed on the front of the sidewalls 3 and 4, interacting with a round spring-loaded retainer 18 placed at its elongated holes in the elongated holes 19 of the side walls 8 and 9 of the ferrule 1. The retainer 18 is a blocking member latches 2 in its closed position. The front part of the cage 1 is made with a rectangular hole 20 in the base 21 and a longitudinal hole 22 which is connected with it.

The front sections of the side walls of the cage 1 are bent parallel to the base 21 in the form of two sections 23 and 24 (Fig. 3), between which there is a free gap K (Fig. 2). Sections 23 and 24 form an additional stop for contacting with the frontal part 10 of the latch 2. Between the front edge of the hole 20 and the tooth -11- and between the rear edges 25 of the sections 23 and 24 and the frontal part 10 of the latch 2 there are equal gaps a and b.

On the base 21, a spring-loaded ejector 26 of the tongue 13 is movably mounted on the holder 1. The ejector 26 has a leg 27 connected to the specified longitudinal hole 22 as a guide channel.

Through an extension 28 in the rear of the opening 22, a strut 29 is mounted in a cage supporting the spring 30 of the ejector 26 and the spring 31 of the latch 18.

The post 29 has opening ribs 32, the ends of which enter the slots 7 of the side walls 8 and 9 of the cage 1, thereby blocking the possibility of the tabs 5 and b of the latch 2 falling out (Fig. 2). The spring 31 is worn on the rod 34,

the head 35 of which covers the latch 18, and the tail part passes through the hole 36 in the rack 29. At the bottom of the rack 29 is equipped with a tooth 37, which is hooked to the edge of the expansion 28 of the hole 22. U-shaped

plan (Fig. 2), the opening button 38 covers its side walls 39 and 40 of the side walls 8 and 9 of the clip 1. In the walls 39 and 40 are oblong holes 41 through which the ends of the latch 18 pass, and on the lower tail sections of the walls 39 and 40 formed by stepped protrusions 42 and 43, included in the cutouts 44, made in the corners of the base 21 and side walls 8 and 9 in the middle part of the cage 1

(Fig. 3).

The ends of the latch 18 and the stepped protrusions 42 and 43 hold the button 38 on the clip 1. At the same time, the button 38 has the possibility of longitudinal movement in

limits of length e (Fig. 1).

The ejector 26 is made with two symmetrical legs 45, ending with external lateral protrusions 46 and 47, sliding along the inner surfaces of the side walls 8 and 9 of the cage 1. The distance H between the protrusions 46 and 42, respectively, between the protrusions 47 and 43 is equal to the full stroke length of the ejector 26. On the surface of the ejector 26 there are two symmetrical protrusions 48 and 49 for centering the position of the latch 2 when it is open.

A rod 50 is attached to the yoke 1 with a rivet 51 passed through the hole 52 in the yoke (Figs. 1 and 3).

The receiving part of the lock is enclosed in a protective housing 53 covering the clip 1 and the opening button 38 along with the remaining parts.

The passage 54 (Fig. 1) in the head 55 of the button 38 is formed with a bell to facilitate pushing the end 12 of the tongue 13 into the receiving honor of the lock when it is locked. The slit 56 (Fig. 3) of the clip 1 has a width and height slightly greater than the width and thickness of the inserted end 12 of the tongue 13 to allow free passage of the end 12 into the clip 1.

Thus, in the closed position (Figs. 1 and 2), tongue 13 is reliably bounded in all lateral directions.

The tongue 57 (Figs. 1 and 2) on the back of the head 55 of the opening button 38 serves to eliminate the tingle of the tongue 13 in the closed position.

To center and hold the protective housing 53, ribs 58 are made inside the latter (Fig. 4).

To ensure the functional properties of the latch 2, it is heat treated, thus being a leaf spring.

The castle operates as follows. To unlock the lock, which is in the closed position (Figs. 1 and 2), it is necessary to press the head 55 of the unlock button 38. When moving the button 38 along the clip 1, it, which contacts the edges of its oblong holes 41 with the latch 18, shifts the latter from the protrusions 16 and 17 of the latch 2, and when the path e is passed, the blocking of the latch is stopped. As a result of this, by the force of the spring 30, the pusher 26, pressing on the end face of the inserted end 12 of the tongue 13 and, accordingly, on the back surface of the tooth 11 of the latch 2, creates a torque turning the latch 2 around the contact points of its legs 5 and 6 with the reference ehmomes of the slots 7 in the side walls 8 and clips 1.

In this case, the tooth 11 disengages from the hole 15 of the tongue 13, into the ejector 6, continuing its movement under the action of the spring 30, throws the tongue 13 out of the brym and turns out to be its front platinum under the end of the tooth 11. In the open addition in figure T, the latch 2 is shown the dash line. In this position, the latch 18 is located behind the protrusions 16 and 17 of the flanges 3 and 4 of the latch 2, and the spring 31 of the latch 18 is maximally pressed. The azmykan process ends with the azmykan button 38 returning to its outcome (advanced) position. This is due to the fact that the ejector 26 continues to move forward and the protrusions 6 and 47 at the ends of its legs 45, interacting with the stepped protrusions 42 and 43, rotate the button 38 in addition to the motion e (Fig. 1 and 2 ) back.

In order for the opening to occur unhindered, a gap is required.

ditch a and b, that is, so that when turning 55, the clicks of her tooth 11 and part 10 do not touch

button with a force of not more than 60 N, when the zemo is subjected to tension of 300 N. In this lock, this requirement with a certain margin is ensured by

the angle at which the tabs 5 and b are bent is selected within the range of 50-80 degrees, as well as by optimizing the elasticity of the sides of the latch by tapering them toward the legs.

Under normal, normal operating conditions of the seat belt, tensile loads do not act on the lock and, therefore, the gaps a and b have their initial maximum value.

In the event of dangerous emergencies, the seat belt is subjected to a corresponding load, which can reach very high values in severe traffic accidents. In this case, the lock receives a load of the order of 18-20 kN.

The proposed lock easily withstands even a large load, since the tooth latch, by moving it forward,

abuts against two barriers: the supporting edge of the hole 20 of the base 21 and the edges 25 of the sections 23 and 24 of the holder 1 (Fig. 5).

The forward latch 2 is prevented by the bent tabs 5 and 6, which

while abutting against the supporting edges of the slots 7 in the side walls 8 and 9 of the cage 1.

The force required to move the latch 2 by the amount of clearance a. defined by a simplified formula

Ta 2 Pa / iga,

where Ta is the tensile force of the castle;

Ra is the force required to deflect the side of the latch by tg a.

From the formulas of the resistance of materials it is known that

45

R

f-E-l 3-K

I

where f is the amount of deflection;

E is the modulus of elasticity;

I is the moment of inertia of the cross section;

E is the length of the bendable console (in this case, the sidewalls of the latch);

K is a coefficient depending on the shape of the sides of the latch.

Assuming that the value of C -

3EIK

ow

the supporting edges of the hole 20 in the base of the holder 1 and sections 23 and 24.

According to UNECE Regulation No. 16, it must be opened by clicking on

conditional rigidity of one sidewall, we obtain a theoretical formula for determining the magnitude of the force at the time of washing off the latch with stops in the holder

Ta - 2a C tg2 a

Thus, the closure force to the greatest extent depends on the angle a of the tabs of the tabs of the sides of the latch.

Based on the requirements of UNECE Regulation No. 16, according to which the lock must be opened when the load is unloading, and taking the necessary safety margin, the size and parameters of the latch are easily determined, and the gap size a (and, accordingly, b) is necessary.

When closing to the receiving part of the lock through the passage 54 (Fig. 1) in the head 55 of the disconnect button 38 and through the slot 56 (Fig. 3), the plug-in end 12 of the tongue 13 is inserted into the holder 1. In this case, the ejector 26 is pushed back, compressing the spring 30 When the tooth 11 of the latch 2 is over the hole 15 of the end 12 of the tongue 13, the spring 18 pushes the latch 18 against the rear edges of the protrusions 16 and 17 and rotates the latch 2 to the closed position. In this case, the latch tooth 11 is located in the holes 15 of the tongue 13 and 20 of the base 21 of the holder 1, and the latch 18, having advanced in the elongated holes 19 of the side walls 8 and 9 of the holder 1, is over the protrusions 16 and 17, blocking the latch 2.

Opening the lock after receiving the extreme load and terminating it takes place in the aforementioned way - by pressing the release button 38 on the head 55. There are no obstacles to this, since when the load ceases, the sides 3 and 4 of the latch 2 are released and the latch 2 is pulled out by the tabs 5 and 6 back to the slot 7 of the sleeve 1, restoring the gaps a and b.

As can be seen from the description and discussion of the drawings, the proposed lock is extremely simple and has increased reliability compared to the prototype and currently available locks for vehicle seat belts.

This lock can be made on automatic lines x. Particularly easy is the complete automation of the assembly process.

It should be noted that the proposed construction, due to its simplicity, reliability and compactness, can be applied in other fields of technology where similar high-speed locks are required that are subjected to high loads.

Formulas a and acquisitions

Claims (8)

1. The lock for a seat belt of the vehicle containing two interlocked parts, detachable and the receiving, detachable is made in the form of a tongue with an eyelet under the strap and an opening at the plug-in end, and the receiving contains a U-shaped clip enclosed in a protective case, connected to a U-shaped latch mounted in a body for securing the lock in the body with a tooth for interacting with the hole of the tongue and the hole made in the base of the clip, spring-loaded locking member latches in the closed position and the language pusher, as well as the opening button, characterized in that, in order to simplify the design and increase the reliability of the lock, in the front of the cage additional emphasis is made for contacting with the frontal part of the latch under extreme lock loads, and the end sections of the side of the latch are made in the form of tabs symmetrically bent at an angle of 50w and freely mounted in slots made in the side walls of the tail section of the clip. 2. The lock according to claim 1, characterized in that the additional emphasis is made in in the form of two sections of the side walls of the cage bent at right angles, and the free gap between these sections exceeds the width of the latch tooth. 3. The castle according to paragraphs. 1 and 2, characterized in that the height of the gap between the base of the clip and the additional emphasis is equal to the thickness of the inserted end of the tongue, including the necessary clearance. 4. The lock according to paragraphs. 1-3, with the exception of the fact that the support post for holding the latch locking body springs and the tongue ejector include symmetrical protrusions located in said slots of the side walls of the cage and in contact with the tabs of the side of the latch on the outside. 5. The lock according to paragraphs. 1-4, characterized in that the gap between the tooth of the latch and the supporting edge of the hole in the base the clips and gaps between the frontal part of the latch and the supporting edges of the additional stop on the clip have the same size .. 6. The lock according to paragraphs. 1-5, characterized in that the latch sides are made tapering towards the bent legs, and the areas for interaction with the blocking body are made in the form of symmetrical protrusions on the sidewalls. 7. The castle in paragraphs. 1-6, characterized in that the side walls of the opening button covering the clip contain step protrusions located in the longitudinal cuts of the clip, and elongated on the tongue ejector 53 15 51 fifty tail portions with mating protrusions for interacting with them. 8. The castle in paragraphs. 1-7, characterized in that the latch tooth is bent forward by an angle equal to the friction angle. 55 dv FIG. 2 FIG. 4 FIG. 5