KR101741809B1

KR101741809B1 - Seat Belt Locking Apparatus

Info

Publication number: KR101741809B1
Application number: KR1020150167040A
Authority: KR
Inventors: 이경상; 신동유
Original assignee: 주식회사 우신세이프티시스템
Priority date: 2015-11-27
Filing date: 2015-11-27
Publication date: 2017-05-31

Abstract

A seat belt locking device is disclosed. A seat belt locking device according to an embodiment of the present invention includes a fixing portion fixed to a housing of a retractor and tilted together with the housing when the housing is inclined, a seat belt rotatably hinged to the fixing portion, The lock includes a lock lever which is engaged with the teeth formed on the drum and selectively restrains rotation of the drum, and an operation weight that is mechanically connected to the fixed portion so as to be rotatable and pushes and rotates the lock lever when the lock lever is rotated relative to the housing do.

Description

Seat Belt Locking Apparatus [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt locking device, and more particularly, to a seat belt locking device for selectively restricting rotation of a drum in accordance with a tilt.

BACKGROUND ART [0002] Generally, a vehicle is equipped with a seat belt in a seat for securing the safety of an occupant, such as a driver. The seat belt is composed of a belt-shaped webbing for fixing a passenger, a seat belt retractor for winding the belt webbing, and a buckle for detachably attaching a belt tongue of a belt webbing end portion.

Here, the seat belt retractor permits the pulling-out of the belt webbing when the belt is worn, but the belt body webbing can be pulled out when the vehicle body is suddenly changed in speed due to collision or sudden rotation, The belt webbing is restrained from being pulled out so that the occupant can be prevented from leaning forward or sideways together with the belt despite wearing the belt.

In particular, according to the performance and test procedure for the advanced vehicle safety system established by the National Highway Traffic Safety Administration (NHTSA), if the acceleration or tilt of the vehicle exceeds a predetermined reference value, .

However, in order to operate as described above, the seat belt retractor must have a sensing device for accurately measuring the acceleration or inclination of the vehicle body and a seat belt locking device for preventing the belt webbing from being pulled out when the measured value becomes a predetermined reference value or more.

A locking device for a seat belt using a commonly used center of gravity of a ball will be described with reference to Fig.

1 is a view showing a conventional seat belt locking device.

As shown in Fig. 1, the sensor ball 14 is inserted into a ball housing 12 having a V-shaped inside with a round bottom. A ball cover 16 is hinged to one side of the upper part of the ball housing 12 at an upper portion of the ball housing 12 so as to be opened and closed by being rotated at a predetermined angle around the central axis of the hinge.

When the vehicle body is tilted, the ball housing 12 itself is inclined, so that the sensor ball 14 flows down the inner wall of the ball housing 12 to open the ball cover 16. [ When the ball cover 16 is opened, the lock lever 18 formed at the upper end thereof is caught by the teeth 202 formed on the drum 200, thereby preventing the webbing from being pulled out by stopping the drum 200.

However, there is a problem that the sensor ball 14 is not fixed, and the ball cover 16 rotates in accordance with the movement of the sensor ball 14, thereby causing a rattle noise when traveling on a non-smooth road surface.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-mentioned problems, and an object of the present invention is as follows.

First, the present invention seeks to provide a seat belt locking device capable of minimizing noise.

Second, the present invention provides a seat belt locking device capable of reducing mold development cost and component cost.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a seat belt fastening device including a fixing part, a lock lever, and an operating weight.

The fixing part is fixed to the housing of the retractor and is inclined with the housing when the housing is inclined.

The lock lever is rotatably hinged to the fixing portion, and is engaged with the teeth formed on the drum on which the seat belt is wound as the rotation rotates to selectively restrict rotation of the drum.

The operating weight is mechanically connected to the fixed portion so as to be rotatable, and pushes the lock lever to rotate as the relative rotation with respect to the housing.

The fixed part includes a cup which is open toward the upper part and has an inner surface formed as a spherical surface, and the operation weight may be provided with a projection whose lower part is formed as a spherical surface and whose lower part is accommodated in the cup.

Thereby, as the fixing portion is tilted, it can rotate relative to the fixed portion to which the operation is added.

The lock lever is provided with a through hole, and the operating lever is disposed to penetrate the through hole, so that the lock lever can rotate together with a relative rotation of the operating lever with respect to the fixed portion.

A portion of the operating weight corresponding to the through hole is formed to have a smaller diameter than the diameter of the through hole, and the lock lever can be rotated when the operation weight is rotated over a predetermined additional angle.

The diameter of the through-hole may be increased toward the bottom, and the diameter of the portion of the operating weight corresponding to the through-hole may be increased toward the bottom.

The operation weight may include a hole that is opened in a running direction of the vehicle, the protrusion may be formed on an upper surface of the hole, and the cup may be positioned inside the hole with the lower portion of the protrusion being received in the cup.

The lower part of the cup is formed with a flow preventing protrusion protruding downward and spaced apart from the lower surface of the hole to narrow the gap between the cup and the operating weir, thereby minimizing the movement in the vertical direction.

The effects of the present invention will be described below.

First, according to the seat belt fastening apparatus according to the embodiment of the present invention, the lock lever is operated by the rotation of the operating weight rotatably and mechanically connected to the fixed portion, and the clearance between the operating weight and the cup And the range of movement in the up and down direction is very small, so that the noise generated during the movement of the operation can be minimized.

Second, according to the seat belt fastening apparatus of the embodiment of the present invention, it is possible to replace only the lock portion in the conventional retractor, thereby reducing the mold development cost and the component cost.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

The foregoing summary, as well as the detailed description of the preferred embodiments of the present application set forth below, may be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, there are shown preferred embodiments in the figures. It should be understood, however, that this application is not limited to the precise arrangements and instrumentalities shown.
1 shows a conventional retractor;
2 shows a retractor to which a seat belt locking device according to an embodiment of the present invention is applied;
3 is a perspective view of a seat belt lock according to one embodiment of the present invention;
4 is a view showing a fixing portion of a locking device of a seat belt according to an embodiment of the present invention;
FIG. 5 is an enlarged sectional view showing a state in which the locking device of the seat belt according to the embodiment of the present invention is rotatably provided to the operation additional fixing part; FIG.
FIG. 6 is a view showing a locking device of a seat belt according to an embodiment of the present invention, viewed from the direction of the vehicle; And
FIG. 7 is a view showing a state where rotation of a drum is restrained by a seat belt locking device according to an embodiment of the present invention. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood, however, that the appended drawings illustrate the present invention in order to more easily explain the present invention, and the scope of the present invention is not limited thereto. You will know.

In describing the embodiments of the present invention, it is to be noted that elements having the same function are denoted by the same names and numerals, but are substantially not identical to elements of the prior art.

Also, the terms used in the present application are used only to describe certain embodiments and are not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

2 is a view showing a retractor to which a seat belt locking device according to an embodiment of the present invention is applied.

As shown in Fig. 2, the retractor for a seat belt includes a housing 100, a drum 200, and a seat belt locking device.

The drum 200 is a cylindrical winder in which the webbing is wound. Here, the webbing is wound around the drum 200 in a direction in which the webbing is drawn into the housing 100 by a return spring assembly (not shown).

The housing 100 receives the webbing therein, and the drum 200 is rotatably coupled to the housing 100 inside. The above-described return spring assembly (not shown) may be coupled to one outer surface of the housing 100 to which one end of the drum 200 is coupled. Meanwhile, a guide groove (not shown) may be provided between the outer surface of the housing 100 and the outer surface of the other side to guide the webbing in only one direction.

The tooth 202 may be formed on the outer peripheral surface of the drum 200 in one direction.

The tooth 202 is formed so that the lock lever 320, which will be described later, is caught in the direction in which the webbing is drawn out, while the lock lever 320 is not engaged in the webbing pull-in direction.

3 to 6, the seat belt locking device 300 of the present embodiment includes a lock lever 320, which will be described later, to operate the lock lever 320. Hereinafter, The seat belt locking device 300 will be described.

FIG. 3 is a perspective view of a seat belt locking device according to an embodiment of the present invention, FIG. 4 is a view illustrating a fixing portion of a locking device of a seat belt according to an embodiment of the present invention, FIG. 6 is an enlarged cross-sectional view showing a state in which the locking device of the seat belt according to the embodiment is rotatably provided with respect to the additional locking part. FIG. 6 is a perspective view showing the lock device of the seat belt according to the embodiment of the present invention, Fig.

3 to 6, the seat belt fastening apparatus 300 according to an embodiment of the present invention includes a fixing portion 310, a lock lever 320, and an operating weight 330.

The fixing portion 310 is fixed to the retractor and is inclined with the retractor when the retractor is inclined. The fixing part 310 may be provided with a cup 312 which is open toward the top and whose inner surface is formed as a spherical surface.

The lock lever 320 is rotatably hinged to the fixing portion 310 and is hooked to the teeth 202 formed on the drum 200 on which the seat belt is wound as the drum rotates to selectively restrict rotation of the drum 200 .

The operating weight 330 is rotatably and mechanically connected to the retractor so as to push and rotate the lock lever 320 as it rotates relative to the retractor.

The lower portion of the operating weight 330 may be formed to have a weight in comparison with other portions.

The operating weight 330 may be formed with a locking hole 332 which opens in the running direction of the automobile. The support protrusion 334 protruded downward and received in the cup 312 may be provided on the upper surface of the latching hole 332. The cup 312 may be positioned inside the engagement hole 332 with the lower portion of the support protrusion 334 being received in the cup 312. That is, the support protrusion 334 may be received in the cup 312 and support the operation weight 330.

The lower portion of the support projection 334 is formed into a spherical surface and the spherical portion is received in the cup 312 and can be in contact with the inner surface of the cup 312. As a result, the operating weight 330 can rotate relative to the fixed portion 310 as the fixed portion 310 is tilted.

On the other hand, a flow preventing protrusion 314 protruding downward from the bottom of the cup 312 and separated from a lower surface of the latching hole 332 may be formed. The flow preventing protrusion 314 can narrow the gap between the cup 312 and the operating weight 330 and minimize the movement of the operating weight 330 in the up and down direction. Thus, noise caused by the movement of the operating weight 330 in the up and down direction can be minimized.

Here, soft material may be applied to the outer surface of at least one of the operating weight 330 and the cup 312 to further reduce noise due to the movement of the operating weight 330. For example, at least one of the operating weight 330 and the cup 312 may be coated on its outer surface with rubber, silicone, or the like. Alternatively, the whole may be formed of silicon.

The lock lever 320 is formed with a through hole 322 and the operation weight 330 can be arranged to penetrate the through hole 322.

The inner surface of the operating weight 330 and the through hole 322 can be spaced apart from each other. That is, the portion 336 corresponding to the through hole in the operation weight 330 may be formed to have a smaller diameter than the diameter of the through hole 322. [

In this embodiment, the diameter of the through-hole 322 may be increased toward the bottom. That is, the inner surface of the through hole 322 may be formed of the inclined surface 324. The portion 336 corresponding to the through hole in the operation weight 330 may also be formed to have a larger diameter toward the lower portion.

The operating weight 330 and the inner surface of the through hole 322 are in contact with each other when the operating weight 330 rotates more than a predetermined angle with respect to the fixed portion 310 so that the operating weight 330 pushes the lock lever 320 So that the lock lever 320 can be caught by the teeth 202.

The actuating weight 330 may be designed to abut against the inner wall of the through hole 322 when the actuating weight 330 is rotated at a predetermined angle with respect to the fixed portion 310 and push the lock lever 320 when the actuating weight 330 rotates over a certain angle.

That is, when the vehicle is inclined at a predetermined angle or more, the lock lever 320 is operated to stop the pulling-out of the webbing.

Hereinafter, the operation of the seat belt locking device 300 according to the embodiment of the present invention will be described with reference to FIG.

FIG. 7 is a view showing a state where rotation of a drum is restrained by a seat belt locking device according to an embodiment of the present invention. FIG.

When the automobile descends the inclined plane 324, the fixed portion 310 fixed to the housing 100 of the retractor is inclined.

Even when the fixing portion 310 is inclined, the operating weight 330 rotates relative to the fixing portion 310 due to its own weight and maintains the initial state. That is, when the fixing portion 310 is inclined, the position of the operating weight 330 does not change, but the angle between the fixing portion 310 and the operating weight 330 can be increased.

When the fixed portion 310 is inclined at a certain angle or less, the operating weight 330 does not come into contact with the inclined surface 324 of the lock lever 320 so that the lock lever 320 does not operate, The actuating weight 330 is brought into contact with the inclined surface 324 of the lock lever 320 to push up the lock lever 320 and the lock lever 320 is pushed up by the teeth of the drum 200 202 so that the rotation of the drum 200 can be restrained.

In the conventional locking device 10 in which the sensor ball is incorporated, since the sensor ball 14 freely moves between the ball housing 12 and the ball cover 16, when the automobile travels on an uneven surface The sensor ball 14 moves and generates noise that hits against the ball housing 12 and the ball cover 16.

The seat belt lock device 300 of the present embodiment is provided with an operation weight 330 instead of the sensor ball and a support protrusion 334 formed on the operation weight 330 in the cup 312 in which the flow prevention protrusion 314 is formed, It is possible to minimize the generation of noise due to the movement of the operating weight 330 even when the automobile runs on an uneven surface.

In addition, since the seat belt fastening device 300 of the present embodiment can be applied to the conventional housing 100, it is possible to reduce mold development cost and parts cost.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

10: Locking device 12: Ball housing
14: Sensor ball 16: Ball cover
18: latch 100: housing
200: Drum 202: Toothed
300: Locking device 310:
312: cup 314: flow prevention projection
320: Lock lever 322: Through hole
324: slope surface 330: operation weight
332: latching hole 334: projection

Claims

A fixing part fixed to the housing of the retractor and inclined with respect to the housing when the housing is inclined and having a spherical surface whose inner surface opens upward;
A lock lever rotatably hinged to the fixing portion and engaged with a tooth formed on a drum on which the seat belt is wound as the drum rotates to selectively restrict rotation of the drum;
A lower portion of the hole is formed in a spherical surface to form a protrusion to be received in the cup and a lower portion of the protrusion is received in the cup so that the cup is positioned inside the hole, And an actuating weight that is mechanically connected to the fixed portion so as to be rotatable so as to pivot and rotate the lock lever relative to the fixed portion as the fixed portion is inclined,
Wherein the outer surface of at least one of the cup and the operating weight is coated with rubber or silicon or is entirely formed of silicon,
And a flow preventing protrusion protruding downward from the lower portion of the cup and spaced apart from the lower surface of the hole to narrow a gap between the cup and the operating weight to minimize noise caused by the movement of the operating weight in the vertical direction,
Wherein the lock lever is formed with a through hole having an inner diameter larger than the diameter of the through hole, the inner diameter of the lock lever being larger than the diameter of the through hole, And the diameter becomes larger toward the bottom,
Wherein when the fixing portion is inclined to a certain angle or less, the inner surface of the through hole is not brought into contact with the operation lever,
Wherein when the fixing portion is inclined by a predetermined angle or more, the operation weight and the inner surface of the through hole are in contact with each other by rotating relative to the fixed portion, thereby pushing and rotating the lock lever.

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