JPS599650Y2 - seat belt device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seatbelt device for protecting occupants during vehicle emergencies, and particularly to a seatbelt device designed to reduce the pressure felt by occupants while wearing restraint webbing.

Generally, a seat belt device applies tension to the webbing by winding one end of the webbing for occupant restraint by a biasing force onto a winding device attached to the vehicle body, and while the webbing is being worn, the webbing is brought into close contact with the occupant. Moreover, after the webbing is released, most of the webbing is wound up to prevent the webbing from being scattered inside the vehicle.

However, the tension applied to the webbing causes a feeling of pressure on the occupant while riding the vehicle.

The winding force that generates this webbing tension cannot be lower than a predetermined value because it is necessary to reliably wind the webbing when the webbing is not worn, and this becomes a cause of fatigue for the occupant.

Particularly in two-door vehicles, the anchor position of the shoulder webbing is relatively located at the rear of the vehicle, so the amount of webbing that extends from the take-up device is large, which increases the feeling of pressure on a portion of the shoulder of the occupant.

For this reason, various types of winding devices have been proposed in the past that apply a low level of winding force to reduce the feeling of pressure on the passenger after the passenger wears the webbing.

Among these systems, those that mechanically control the winding force of the webbing have the problem that the reduced winding force is released when the occupant moves inside the vehicle, resulting in a high level of winding force, and there is also the problem that If the winding force is reduced in conjunction with the movement, there is a risk of the webbing being accidentally caught between the door and the vehicle body, and a switch is installed inside the buckle used to attach the webbing. A mechanism has been proposed in which the webbing take-up shaft is locked using a solenoid or the like in response to a closing signal from a switch, but this mechanism is extremely expensive.

Taking the above facts into consideration, the present invention aims to provide a seat belt device that has a simple structure, has few failures, and can reliably relieve the feeling of pressure on the occupant.

The seat belt device according to the present invention connects the first and second springs in series between a take-up shaft and a frame that pivotally supports the take-up shaft, and a gear wheel is provided in the middle of these springs to attach the webbing. The locking device is actuated by the anchor plate, which moves when the webbing is installed, to prevent rotation of the gear wheel, thereby causing only the second spring to act on the take-up shaft when the webbing is attached.

Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, the occupant restraint webbing 10 is a so-called three-point seat belt device that restrains the waist and eyebrows of an occupant seated on a seat 14 of a vehicle 12.

Here, the middle part of the webbing 10 is folded back by a through ring 18 pivotally supported on the sidewall 16 of the vehicle 12, and one end is wound up on a winding device 20 attached to the sidewall 16.

The other end of the webbing 10 is secured to an anchor plate 22 attached below the site wall 16, and the anchor plate 22 and snow railing 1
A tongue plate 24 is attached between the webbing 8 and the tongue plate 24, which is movable in the longitudinal direction of the webbing 10 when necessary.

Therefore, the passenger seated on the seat 14 is seated on the tongue plate 24.
When the webbing 10 is secured to the buckle device 26 that stands up from the approximate center of the vehicle, one side of the webbing 10 wraps around the shoulder of the occupant, and the other side wraps around the occupant's waist, as shown by the two-dot chain line in FIG. They are bent so as to touch each other to form a state in which a three-point seat belt device is attached.

The winding device 20 has a frame 28 as shown in FIG. 2, and legs 30 . A winding shaft 34 is pivotally supported on 32 .

The other end of the webbing 10 is wound around the winding shaft 34 in a layered manner.

A slit 36 is provided in the winding shaft 34 protruding from the leg 32, and the first mainspring spring 38 is inserted into this slit.
The inner end of is inserted.

The first mainspring spring 38 is inserted into a circular recess 42 of a gear wheel 40 that is pivotally supported on the end of the winding shaft 34, and the outer end of the first mainspring spring 38 is connected to a pin of the gear wheel 40. 44.

A ratchet wheel is formed on the outer periphery of the gear wheel 40, and a slit 46 is formed in a part of the outer periphery of the gear wheel 40.
The inner end of the mainspring spring 48 is inserted.

The outer end of the second mainspring spring 48 is inserted into a slit 52 of a cover 50 attached to the leg portion 32 of the frame 28.

Here, the biasing force of the second mainspring spring 48 is larger than that of the first mainspring spring 30.

These first and second springs 38 and 48 are arranged in series with the gear wheel 40 in between, and are adapted to urge the winding shaft 34 in the winding direction of the webbing 10, respectively.

A shaft 56 projects from a mounting plate 54 extending from the cover 50, and a locking lever 58 and a force receiving lever 6
0 ends are each pivoted.

A tension coil spring 62 is interposed between the locking lever 58 and the mounting plate 54 to bias the lock claw 64 at the tip in a direction away from the ratchet gear of the gear wheel 40, but when the receiver lever 60 rotates. In this case, the protrusion 66 protruding from the receiving lever 60 can engage the gear wheel 40 which is rotated against the biasing force of the coil spring 62.

When the lock pawl 64 engages with the gear wheel 40 in this way, the gear wheel 40 is prevented from rotating in the winding direction, thereby preventing the biasing force of the second mainspring spring 48 from being transmitted to the winding shaft 34, The structure is such that only the biasing force of the first mainspring spring 38 is transmitted to the winding shaft 34.

It is preferable that the force receiving lever 60 is formed of a plate spring, and one end of a wire 68 is secured to the tip of the force receiving lever 60, and this wire 68 is moved by the rotation of the anchor plate 22. 60 is rotated, and when the moving stroke of the wire 68 exceeds the required amount, the receiving lever 60, which is made up of a leaf spring, is bent to absorb the excessive stroke.

A wire force bar 70 that also protects the wire 68 is attached to the frame 28 at one end.

The frame 28 has legs 30 . Paul 72 between 32
is pivotally supported, and this pawl 72 is pushed up by a pendulum 74 attached to the leg 30 so that it can mesh with a ratchet wheel 76 fixed to the winding shaft 34.

Here, the pawl 72 is separated from the ratchet wheel 76 due to its own weight in the normal running state of the vehicle, and in the event of a vehicle emergency, the pendulum 74 swings and pushes the pawl 72 up to engage with the ratchet wheel 76, causing the ratchet wheel 76 and the winding The webbing unwinding rotation of the take-up shaft 34 is stopped.

As shown in FIGS. 3 and 4, the anchor plate 22 is pivotally supported by bolts 78 to a U-shaped plate 80 which is fixed to the lower part of the side wall 16 by bolts 78.

A torsion coil spring 82 is interposed between the anchor plate 22 and the U-shaped plate 80.
Due to the urging force, the anchor plate 22 is rotated until the longitudinal direction thereof faces toward the rear of the vehicle, as shown in FIG. 3, when the occupant is not wearing the webbing.

Therefore, this anchor plate 22 is designed so that it does not interfere with the riding motion of rear seat occupants when they get on the vehicle.

A rocker arm 84 is pivotally supported by the bolt 78 in the same way as the anchor plate 22, and the other end of a wire 68, which has one end locked to the receiver carrier 60, is locked.

Here, the locker arm 84, wire 68, receiver lever 60, and locking lever 58 constitute a locking device for locking the gear wheel 40 when necessary.

This locking device is operated when the webbing is not attached as shown in FIGS. 1 and 3, that is, when the anchor plate 22
When the winder is approximately horizontal, the rocker arm 84 is rotated clockwise by the maximum amount in FIG. 3, so that the gear wheel 40 in the winding device 20 can freely rotate. It has become.

In addition, when the passenger wears the webbing 10 as shown by the two-dot chain line in Figures 1 and 3, the webbing 10
The tension acting on the anchor plate 22 causes it to rotate clockwise in FIG. 3 against the biasing force of the torsion coil spring 82, and at the time of this rotation, the cut-out protrusion 86 provided at the intermediate portion of the anchor plate 22 rotates the rocker arm 84 as shown in FIG. Turn the locking lever 58 counterclockwise to pull the wire 68 and move the locking lever 58 to the gear wheel 40.
It is now possible to fit into the

The end of the wire force bar 70 is locked to a U-shaped plate 80.

To explain the operation of this embodiment configured in this way, FIGS. 1 and 3 show a state in which the occupant is not wearing webbing.

In this state, the anchor plate 22 is horizontal, so it does not interfere with the movement of the occupant riding in the rear seat of the vehicle 12.

Next, when the occupant sits on the seat 14 and secures the tongue plate 24 to the buckle device 26, the torsion coil spring 82 is attached to the anchor plate 1 as shown by the two-dot chain line in Figures 1 and 3. It is rotated against the urging force of.

As a result, the locking arm 84 rotated by the anchor plate 22 pulls the wire 68 and engages the locking lever 58 in the winding device 20 with the gear wheel 40 .

As a result, the biasing force of the second mainspring spring 84 is applied to the winding shaft 34.
The winding force is not transmitted to the winding shaft 34, and only the first mainspring spring 38, which has a weak urging force, transmits the winding force to the winding shaft 34.

Therefore, the weak biasing force of the first mainspring spring 38 acts on the occupant wearing the webbing 10, so that the fatigue of the occupant is significantly reduced.

In addition, under normal vehicle driving conditions, the occupant should wear webbing 1.
The riding posture can be changed while unwinding the vehicle from the winding device 20.

Also, while attaching the webbing 10, the anchor plate 2
2, the biasing force of the torsion coil spring 82 acts to try to rotate the anchor plate 22 in the clockwise direction in FIG. Never.

Next, if the vehicle is in an emergency situation such as a collision, the pendulum 74
In order to push up the pawl 72, the pawl 72 engages with the ratchet wheel 76 to abruptly stop the webbing unwinding rotation of the take-up shaft 34, thereby ensuring the safety of the occupant by reliably restraining the occupant.

Next, when the passenger exits the vehicle, when the tongue plate 24 is attached and detached from the buckle device 26, the anchor plate 22 is rotated from the two-dot chain line position to the solid line position in FIG. 84 moves the wire 68 to release the locking lever 58 from the ratchet wheel 76.

As a result, the second mainspring spring 48 with a large biasing force reliably rotates the winding shaft 34 and winds up the webbing 10, so that most of the webbing 10 is wound up and returned to the position shown by the solid line in FIG. do.

In the above embodiment, the locking device is actuated by the rotation of the anchor plate 22, but the present invention is not limited to this.
The anchor plate 22 may be moved in a straight line as long as it detects the attachment state of the webbing 10 and moves to activate the locking device.For example, the anchor plate 22 may be moved in a straight line.

As explained above, the seat belt device according to the present invention operates the locking device using the anchor plate that is moved when the occupant wears the webbing, and retracts the webbing using only one spring, so the simple structure ensures that the webbing is securely attached to the occupant. It has an excellent effect of reducing the feeling of pressure applied.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the seat belt device according to the present invention as seen from inside the vehicle, and Fig. 2 is an exploded perspective view of the retracting device (
3 is a partially enlarged view of FIG. 1, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. 10... Webbing, 20... Winding device, 22... Anchor plate, 28...
... Frame, 34 ... Winding shaft, 38 ...
...The first mainspring is 40...Gear wheel, 48...The second mainspring spring, 50...
・Locking lever, 60...Receiving lever, 6
8...Wire, 84...Lotsuka arm.

Claims (1)

[Scope of utility model registration request] a take-up shaft that is pivotally supported on a frame attached to the vehicle body and winds up one end of the occupant restraint webbing; a first spring that is pivotally supported on the frame and that winds up one end of the occupant restraint webbing; a gear wheel having the other end of the spring locked, and a second spring having a larger biasing force than the first spring and having one end locked to the gear wheel and the other end locked to the frame.
a spring, an anchor plate to which the occupant restraint webbing is locked and which is in a first position when the webbing is not attached and is in a second position when it is attached; and in the second position of the anchor plate, the gear wheel is A seat belt device comprising a locking device that prevents rotation.