RU2201705C2 - Impact-resistant lock for safety belt - Google Patents

Abstract

FIELD: safety equipment used in vehicles. SUBSTANCE: lock has mutually detachable and receptacle parts adapted to be connected with one another. Detachable part is made in the form of tongue with eyelet for receiving strap and opening in insertable end. Receptacle part has mechanism incorporated in protective casing and comprising U-shaped lock with tooth formed on its front side and adapted for insertion into opening in casing base and in tongue opening. Said mechanism has spring-loaded retainer adapted for blocking said lock and positioned for moving in elongate openings of casing in direction parallel with itself and with casing base under the action of disconnecting button while contacting with surfaces of symmetrical projections on lock sides, and spring-loaded tongue ejector actuated upon displacement of retainer by disconnecting button. U-shaped stopping pendulum is positioned for rotation between casing side walls and has side tabs made in the form of rotating pins arranged in symmetry in additional shaped openings formed in casing walls. EFFECT: simplified construction and enhanced reliability in operation and increased efficiency in protecting driver and passengers from impacts. 6 cl, 9 dwg

Description

 The invention relates to passive safety devices in motor vehicles, in particular in automobiles, for protecting drivers and passengers in emergency cases.

 A known seat belt and vehicle lock [1, 2], containing interlocking detachable and receiving parts, the first of which is made in the form of a tongue with an eye under the strap and a hole at the inserted end, and the second consists of a mechanism enclosed in a protective case containing П- a clip with traction for securing the lock in the body. A U-shaped latch with a tooth on the frontal part is configured to interact with a hole in the base of the clip and a hole in the tongue. The spring-loaded latch for locking the latch under the action of the opening button contacts the surfaces of the symmetrical protrusions on the sides of the latch, and the spring-loaded tongue ejector works when the latch is shifted. The disadvantage is the possibility of spontaneous opening of the lock during longitudinal impact on the mechanism from the traction side, when the opening button under the influence of strong acceleration can move the lock from the locked position to the unlocked position. This disadvantage is eliminated in the claimed invention.

 The problem to which the present invention is directed, is to increase the reliability of the seat belt lock. The technical result is the elimination of technological design flaws. To do this, in the seat belt lock of the vehicle, which contains interlocking detachable and receiving parts, the first of which is made in the form of a tongue with an eye under the strap and an opening at the inserted end, and the second consists of a mechanism enclosed in a protective case. The mechanism comprises a U-shaped clip with a thrust for securing the lock in the body, a U-shaped latch rotatably mounted in the clip with a tooth on the frontal part configured to interact with a hole in the base of the clip and a hole in the tongue. The spring-loaded latch for locking the latch moves in the oblong holes of the cage parallel to itself and to the base of the cage under the action of the opening button. In contact with the surfaces of the symmetrical protrusions formed on the sides of the latch, a spring-loaded tongue ejector is triggered when the latch latch is shifted by the opening button. Unlike the known solutions [1, 2], in the claimed invention, between the walls of the cage, a U-shaped locking pendulum is pivotally mounted, the side paws of which are made in the form of rotation axes located symmetrically in additional curly holes made in both walls of the cage. In addition, the front parts of the side walls of the pendulum are formed in the form of two horn-shaped protrusions for interacting with the head of the spring-loaded lock of the lock latch when the pendulum is rotated to the locked lock position. To keep the pendulum in the idle position during operation, a tension spring is mounted and engaged on one of the flanges of the side walls of the pendulum, while the second end of the specified spring is engaged with an opening made on the lateral tide of the strut - spring support of the lock latch lock. The side walls and the bottom of the U-shaped pendulum freely, without touching, cover the spring-loaded clamp both in the idle and in the working state of the pendulum. To limit the angle of the working rotation of the pendulum at the rear end, the bottom is made with a protrusion that has the ability to abut against the wall of the rack — the spring supports of the lock latch lock.

The proposed design of a shockproof seat belt lock is presented in the drawings:
FIG. 1 is a longitudinal section of a prototype lock in a conventional embodiment in a closed state;
figa is a longitudinal section of the lock of the prototype in the open state;
figure 2 is a longitudinal section of a shock-resistant seat belt lock in the open state (locking pendulum in the initial position, the opening button is recessed to failure - the beginning of the tongue pushing out, some parts are not shown);
figure 3 is a longitudinal section of the seat belt lock in the closed state (part of the details are not shown);
FIG. 4 is a longitudinal section of the seat belt lock in the closed position, the locking pendulum in the locked position of the latch lock (latch lock spring is not shown);
5, 6 and 7 - locking pendulum in three projections;
Fig. 8 is a longitudinal section through a clip of a lock mechanism;
Fig.9 is a top view of a clip with a locking pendulum, fragments of the installation of the pendulum and tension springs.

 The protective housing is not shown in the drawings.

 The prototype lock (Fig. 1, 1a) contains a holder 1, in which a latch 2 with a tooth 3 is mounted, a spring-loaded ejector 4 of the tongue 5. A holder with a rivet 6 is attached to the tail of the rod 7. Through the elongated holes 8 in the side walls of the holder 1, a rod is mounted 9 of the latch F, locking the latch 2 in the closed position. A rod 10 is mounted on the rod 9 with a head 11 covering the middle part of the rod, spring-loaded with a spring 12, the second end of which rests on a curved pillar support 13, which is fixed in the lock with a rivet 6. The end of the rod 10 slides through the hole 10a. The opening button 14 is in contact with both outer ends of the rod 8. The lock is unlocked (Fig. 1a) by pressing the button head 15 of the button 14, the spring 12 is compressed, the rod 9 moves through the holes 8 and releases the latch from the lock, the ejector 4 acts by the action of the spring 4a to eject the tongue 5 out of engagement with the clip 1 and the tooth 3 of the latch 2.

 The described prototype lock when exposed to high shock accelerations on the button 14, for example when using the pyrotechnic preload of the seat belt can open under the strong influence of the mass of the button 14 and the rod 9 on the spring 12. The tongue 5 of the lock is made with a hole 16 for interacting with the tooth 3 of the latch 2, and the tooth 3 interacts with the hole 17 in the bottom of the cage. Shockproof lock (figure 2, 3, 9) is made with a U-shaped locking pendulum 18 (figure 4, 5, 6, 7), pivotally suspended between the inner walls 19 of the cage 1 in symmetrical axial holes 20 (figure 8). The pendulum is made primarily of U-shaped curved sheet steel. It consists of a bottom 21, two symmetrically made side walls 22 and symmetrical flanges 23, ending with axial legs 24, which are mounted in both holes 20 of the holder 1. On the front parts of the side walls, horn-shaped shaped protrusions 25 are provided symmetrically for interaction with the latch latch F. 2. The space K between the walls and the bottom with a large gap covers the diameter of the spring of the clamp F, allowing rotation of the locking pendulum at the required angle (figure 4). The bottom is made with a protrusion 26 to limit the maximum angle of rotation of the pendulum. Holes 27 are made on the flanges of the walls, which serve to engage the tension spring 28 (Fig. 9).

 The lock pendulum is heat treated to give it good elasticity. The tension spring serves as a reliable holder of the pendulum in an idle initial position under normal operating conditions of the seat belt. The other end of the tension spring is engaged in the hole 10a formed on the lateral tide of the strut 13 (Fig.9). The spring tension vector is at a certain angle relative to the bottom of the casing 1, which is necessary to create a moment of rotation that holds the pendulum in an idle initial position.

 The locking mechanism of the seat belt works as follows. Under normal operating conditions, the locking pendulum does not work. In an emergency in the case of a frontal collision of a car with a hard obstacle, if the lock is equipped with a pyrotechnic preload device, then at the end of the device’s action, as a result of significant inertial acceleration, the opening button and locking pendulum simultaneously begin to move, overcoming the resistance of the holding springs 12 and 28, respectively. The presence of the estimated gap d (Fig. 4, 9) between the head of the latch Ф and the horn-shaped protrusions of the pendulum promotes interaction, that is, matching with the head 11, stops the opening movement of the latch and the button. The lock will not open. After the end of the emergency state, the pendulum comes to its original position and the lock is opened by the opening button.

Sources of information
1. SU 1837825, 1993.

 2. RU 2125396, 1996.

Claims (6)

 1. An impact-resistant seat belt lock containing interlocking detachable and receiving parts, the first of which is made in the form of a tongue with an eye under the strap and an opening at the plug-in end, and the second consists of a mechanism enclosed in a protective case containing a U-shaped latch with a tooth on the frontal part, made with the possibility of interaction with the hole in the base of the cage and the hole in the tongue, and a spring-loaded latch to lock the latch, having the ability to move parallel holes in the oblong holes but to itself and to the base of the cage under the action of the opening button, in contact with the surfaces of symmetrical protrusions formed on the sides of the latch, as well as a spring-loaded tongue ejector that is activated when the latch is shifted by the opening button, characterized in that the U-shaped rotary mounted in the lock between the side walls of the holder locking pendulum, the side legs of which are made in the form of axes of rotation, located symmetrically in additional curly holes made in the walls of the cage.  2. The shockproof lock according to claim 1, characterized in that the side walls and the bottom of the U-shaped pendulum freely, without touching, cover the spring-loaded lock both in the idle and in the working state of the pendulum.  3. The shockproof lock according to claim 1 or 2, characterized in that the front parts of the side walls of the pendulum are formed in the form of two horn-shaped protrusions for interacting with the head of the spring-loaded lock of the lock latch when the pendulum is rotated to the locked position.  4. An impact-resistant lock according to claims 1, 2 or 3, characterized in that in order to keep the pendulum in its initial idle position during operation, a tension spring is mounted and engaged on one of the flanges of the side walls of the pendulum, the second end of which is engaged with a hole made on lateral tide racks - spring support latch lock latch.  5. Shockproof lock according to claims 1-3 or 4, characterized in that to limit the working angle of rotation of the pendulum at the rear end, the bottom of the pendulum is made with a protrusion having the ability to abut against the wall of the rack - spring support of the lock latch of the lock.  6. Shockproof lock according to claims 1, 2 or 3, characterized in that to create a moment of rotation that holds the pendulum in the idle position, the tension vector of the tension spring is made with an inclination relative to the bottom of the cage.

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