JPS5934957A - Seat belt device - Google Patents

Abstract

PURPOSE:To make tightening of a seat belt at the time of a collision reliable, by a method wherein the end of the lap belt part of the seat belt is connected with a movable bracket, the belt is wound around a movable bracket and the belt is pulled by moving force of a crew at the time of the collision. CONSTITUTION:A belt tightening system 36 is provided on the lower part of a pillar part 32 of a car body. Then, the end of a belt 38 is engulfed in a retractor 26, through which engulfing force is being applied always and the other end is connected with a movable bracket 50 of the above-mentioned belt tightening system 36. Midway of the belt 38 is penetrated through by a shoulder anchor 34 and a lap anchor 30 and is connectable with a buckle 28 through a tongue. Movement of the above-mentioned movable bracket 50 is interrupted by a shear pin to be sheared when inpact force is larger than a given value. Then, when force applicable to the movable bracket 50 exceeds the given value, the above- mentioned pin is sheared and the bracket 50 is moved. The belt 38, therefore, is tightened.

Description

[Detailed description of the invention] The present invention relates to a seat belt device.

As a conventional seat belt device, there is one shown in FIG. 1, for example. A seat 4 is attached on a vehicle floor portion 2. A beam tractor 6 and a buckle 8 are fixed to the vehicle body floor portion 2 on both sides of the seat 4. Note that a lap anchor 10 is provided integrally with or adjacent to the retractor 6. A shoulder anchor 14 is attached to the vehicle body pillar part 12. The seat belt 16, which is constantly receiving retracting force at one end by the retractor 6, has the shoulder anchor 14 inserted through it, and the other end is connected to the lap anchor IO.

A tongue 18 movable along the seat belt 16 is provided at the intermediate portion of the seat belt 16, and this tongue 18 can be engaged with the buckle 8.

When wearing the seat belt device, press the tongue 18 with the button 8.
This restrains the occupant's waist, shoulders, and chest. When a vehicle collides and an impact force is applied to the occupant, a tensile force is suddenly applied to the seat belt 16, and the tractor 6 fixes the seat belt 16 to prevent the occupant from being thrown forward.

However, when the collision speed is high and a large force is applied to the occupant, the seat belt 16 stretches, the seat belt 16 stretches by the amount of slack when it is wrapped around the tractor 6,
When the retractor 6 fixes the seatbelt 16, the amount of belt unwinding and the like increases the amount of forward movement of the occupant. In other words, the performance of restraining the occupant is reduced. For this reason, for example, as shown in FIG. 2, the occupant who is in a state shown by a solid line in the absence of a collision moves as shown by a broken line in the event of a collision.

As a conventional technique to solve the above-mentioned problems, there is a technique provided with a preloader (sAE paper No. 770933).
issue). That is, a preloader is provided that can rapidly retract the seat belt into the retractor using a spring, fluid pressure, etc., and this preloader is normally left inactive.
In the event of a collision, a collision sensor electrically detects the collision and operates a preloader to tighten the seatbelt. This allows the amount of forward movement of the occupant to be reduced.

However, in the conventional seat belt device equipped with a preloader as described above, the preloader is installed and activated by a signal from a collision sensor, which results in a complicated structure and high price. There was also the problem that operation reliability was insufficient.

The present invention was made by focusing on the above-mentioned problems in conventional seat belt devices, and involves connecting one end of the lap belt portion of the seat belt to a movable bracket, and attaching a portion of the seat belt to the movable bracket. The purpose of this invention is to solve the above-mentioned problems by reducing the amount of forward movement of the occupant's chest and head by pulling the shoulder belt by the force acting on the lap belt from the occupant during a collision.

Hereinafter, the present invention will be explained based on FIGS. 3 to 9 of the accompanying drawings showing embodiments thereof.

First, the configuration will be explained.

As shown in FIG. 3, a seat 24 is installed on the vehicle floor section 22, and the vehicle body floor sections 24 on both sides of the seat 24 are mounted on the vehicle floor section 22.
2, a retractor 26 and a buckle 28 are fixedly installed. Note that a lap anchor 30 is provided integrally with or adjacent to the retractor 26. Car body pillar part 32
A shoulder anchor 34 is attached to the. A belt tensioning mechanism 3 (described later) is provided on the lower side of the vehicle body pillar part 32.
6 is also provided. One end of the belt 38 is wound around the tractor 26 and constantly receives a winding force, and the other end is connected to a movable bracket 50 (described later) of the belt tensioning mechanism 36. And the lap anchor 30 is inserted. A tongue 40 that is movable along the belt 38 is provided in the middle of the belt 38. The tongue 40 is engageable with the buckle 28.

The pelt tensioning mechanism 36 is shown in FIGS. 4 and 5.

The stationary bracket 42, which is a stationary member, is connected to the ports 44 and 4.
6 to the vehicle body pillar part 32. Stationary bracket 42 rotatably supports roller 48.

The stationary bracket 42 also has a rectangular hole 42a in the center, and this hole 42a allows the movable bracket 50 to
can be guided in the vertical direction in FIG. That is, the bent portion 50a of the movable bracket 50 is fitted between both sides of the hole 42a of the stationary bracket 42. The movable bracket 50 rotatably supports a roller 52 that constitutes a belt guide section.

The movable bracket 50 has two pin holes 50b and 50C, and the stationary bracket 42 also has corresponding pin holes 42b and 42c.
The movable bracket 50 is fixed to the stationary bracket 42 by fitting the shear pins 54 and 56 into the pin holes 50C and 542c, respectively. Note that the shear pins 54 and 56 have such strength that they will be sheared when a predetermined force or more is applied between the stationary bracket 42 and the movable bracket 50. The movable bracket 50 has a mounting hole 50d, and the mounting hole 50d and the port 5
8 and is connected to a metal fitting 60 fixed to the other end of the belt 38. That is, the port 58 is connected to the mounting hole 6 of the metal fitting 60.
0a and the mounting hole 50d of the movable bracket 50, and is screwed into the screw 62a of the stopper 62.

As shown in FIGS. 6 and 7, the belt 38 is first wound around the roller 48 from the retractor 26.

Next, it is wound around the roller 52, then the shoulder anchor 34 is inserted, and then the wrap anchor 30 is inserted and connected to the movable bracket 50. The tongue 40 is provided at a portion of the belt 38 between the shoulder anchor 34 and the lap anchor 30.

Next, the effect will be explained.

When the vehicle collides, a force is applied to the seat belt 38 due to the inertial movement of the occupant. Therefore, the movable bracket 5
A force acts on 0. When the collision speed is low, this force is small and the shear pins 54 and 56 are not sheared. Therefore, in this case, the function is exactly the same as that of a conventional seat belt device. However, if the collision speed is higher than a certain value, the force acting on the movable bracket 50 exceeds the shear tolerance of the shear pins 54 and 56.
Shear pins 54 and 56 are sheared.

Therefore, the movable bracket 50 is pulled by the seat belt 38 and moves downward. This tightens the seatbelt 38, but in this case, the lap belt portion 38b of the seatbelt 38 (that is, the portion between the tongue 40 and the lap anchor 30) becomes longer by the dimension (this dimension is a movable bracket). 50) is the shoulder belt portion 38a of the seat belt 38.
(ie, the portion between shoulder anchor 34 and tongue 40) is shortened by two dimensions.

This is because, as shown in FIG. 8, the movable bracket 50
When the roller 52 is moved downward by the same dimension, the roller 52 supported by the movable bracket 50 is also moved downward by the intersection dimension (note that the roller 48 does not move), and the seat belt 38 is wound around the roller 52 in a U-shape. The part becomes longer by two sentences.

This is because the shoulder belt portion 38a is drawn in by that amount. Therefore, in the case of a high speed collision, the lap belt portion 38b will loosen slightly.

The shoulder belt part is tightened. As a result, the occupant moves forward as shown by the broken line in FIG. 9, and the amount of movement of the shoulders and chest (therefore, the amount of movement of the head) becomes smaller. In other words, the crash restraint performance of the seat belt device is improved. Moreover.

*The seat belt device according to the invention mechanically tightens the shoulder belt portion 38a by using the force of the lap belt portions 38- and b that always acts in the event of a collision, so the structure is simple and the cost is low. can be reduced. Furthermore, since a collision sensor and a preloader activated by an electric signal from the collision sensor are not used, malfunctions and malfunctions do not occur, and reliability is greatly improved.

As explained above, according to the present invention, the tractor and wrap anchor attached to the vehicle body floor on one side of the seat, the buckle attached to the vehicle body floor on the other side of the seat, and the vehicle body above the retractor. It has a shoulder anchor attached to a part of the pillar, a seatbelt whose one end can be retracted by a retractor and into which the shoulder anchor is inserted, and a tongue which is connected to the seatbelt and can be engaged with the buckle. Sometimes, by engaging the tongue with the buckle, the shoulder belt part of the seat belt between the shoulder anchor and the tongue restrains the shoulders and chest of the occupant, and the lap belt of the seat belt between the tongue and the lap anchor restrains the occupant's shoulders and chest. In a seatbelt device that restrains the occupant's waist by means of a seat belt, the other end of the seatbelt through which a lap anchor is inserted is connected to a movable bracket, and the movable bracket is used to prevent the occurrence of a force exceeding a predetermined level acting on the other end of the seatbelt. The movable bracket is supported by a stationary member so as to be movable only when the movable bracket is moved. Since the seat belt glue is inserted through the part between the tractor and the shoulder anchor, the shoulder belt part of the seat belt can be reliably tightened in the event of a collision with a simple and inexpensive structure.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional seat belt device, FIG. 2 is a diagram showing the movement of an occupant during a collision with a conventional seat belt device, and FIG. 3 is a diagram showing a seat belt device according to the present invention.
Figure 4 is an exploded perspective view of the belt tightening mechanism of the seat belt device according to the present invention, Figure 5 is a sectional view of the belt tightening mechanism of the seat belt device according to the present invention, and Figure '6 is the present invention when not worn. FIG. 7 is a side view of the seat belt device according to the present invention when it is not worn, FIG. 8 is an enlarged view showing the operating state of the belt tightening mechanism of the seat belt device according to the present invention, and FIG. 9 is a perspective view of the seat belt device according to the present invention. The figure is a diagram showing the movement of an occupant during a collision using the seat belt device according to the present invention. 22...Vehicle floor, 24, ψ, seat, 26ψ...
Retractor - 128... φ buckle, 30... U, pump anchor, 32, Part of the pillar of the participating vehicle, 34... Shoulder anchor, 36 Φφ, belt tightening mechanism, 38, Book belt, 38a... Shoulder belt Department, 38b・
... Lap belt part, 40, ψ, tongue, 42... Shizuichi bracket, 42 a@* a hole, 42b, 42c*
*e Pin hole, 44, 46-... Bolt, 48, 0. Roller, 50... Movable bracket, 50a... Bent part, 50b, 50c, Fist pin hole, 50d... Mounting hole, 52 ...Roller (belt guide tall), 54
．． 56...Share pin, 58...Bolt, 60・Φ
・Metal fittings, 60a...Mounting hole, 62 Fist...Patch, 62
a...Screw hole. Patent applicant Nissan Motor Co., Ltd. Company agent Patent attorney Miyauchi
Ri row 1 10 1B2 Figure 327sFM 8 *StvI 8th g! Route 9 diagram

Claims (1)

[Claims] A tractor and lap anchor attached to the floor of the vehicle body on one side of the seat, a buckle attached to the floor of the vehicle body on the other side of the seat, and a retractor attached to a portion of the vehicle body pillar above the seat. It has a shoulder anchor, a seatbelt with one end that can be wound up by a retractor and through which the shoulder anchor is inserted, and a tongue that is connected to the seatbelt and can be engaged with the buckle, and when worn, the tongue is attached to the buckle. By engaging, the shoulder belt part of the seat belt between the shoulder anchor and the tongue restrains the shoulders and chest of the occupant, and the lap belt part of the seat belt between the tongue and the lap anchor restrains the passenger's waist. In a seat belt device designed to The other end of the seatbelt, through which the lap anchor is inserted, is connected to a movable bracket, and the movable bracket is supported by a stationary member so as to be movable only when a predetermined force or more is applied to the other end of the seatbelt, and the movable bracket is movable. The bracket is provided with a belt guide part through which a seat belt can be inserted and which can pull the inserted seat belt in the moving direction of the movable bracket,
A seat belt device characterized in that a portion between the seat belt tractor and the shoulder anchor is inserted through the belt guide portion.