JPS62292551A - Automatic lock type seatbelt device - Google Patents

Abstract

PURPOSE:To prevent occurrence of endlock by detecting the removal of a tongue plate from a buckle and functioning a cancell mechanism then maintaining the disabled condition of a lock mechanism. CONSTITUTION:When a tongue plate is removed from a buckle, a buckle switch 40 is turned on. Consequently, a solenoid 35 is exited to attract a plunger 34 so as to rotate a cancell lever 30 upwardly. An arm 33 at the tip of the lever 30 engages with an arm engaging section 25a at the rear end of an actuator lever 25 so as to push the engaging section 25a from below. As a result, the tip side of the actuator lever 25 starts to rotate downwardly around a pin 29 and push the upper face of a weight 26. In such a manner, a clock 24 is held at a position separated from a ratchet wheel 23 and a lock mechanism 21 is maintained in a disabled condition.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a seat belt device that restrains the body of an occupant when a vehicle suddenly decelerates. The present invention relates to an automatically locking seat belt device in which a locking mechanism is actuated to prevent the webbing from being pulled out from the tractor upon sensing the situation.

(Prior art) Seat belt devices installed in vehicles such as automobiles have the ability to securely restrain an occupant in the seat when the vehicle suddenly decelerates, as well as the ability to retract the webbing when not in use and to easily remove the webbing when worn. It is required to be able to be pulled out and absorb the slack, and to not interfere with driving operations under normal conditions even when worn. As a seatbelt device that satisfies such requirements, an automatic locking seatbelt device is known.

This automatic locking seat belt device has one end of the webbing retracted by a retractor, and a tongue plate attached to the other end or slidably attached to the middle part of the other end.
It is designed to be locked to a buckle provided on the vehicle body side. The webbing take-up shaft of the retractor is always urged by a spring in a direction to take up the webbing. The retractor is provided with a locking mechanism that prevents the webbing from being pulled out when the vehicle suddenly decelerates.

FIG. 7 is an explanatory diagram showing an example of a locking mechanism in such an automatic locking seat belt device.

As is clear from this figure, a ratchet wheel 3 is integrally attached to the webbing take-up shaft 2 of the retractor 1. The winding shaft 2 is urged by a not-illustrated helical spring so as to always rotate in the direction in which the webbing 4 is wound, that is, clockwise in the figure.

An actuator lever 6 having a pawl 5 at its tip is provided below the ratchet wheel 3. The base end of this lever 6 is connected to a support base 7 provided in the retractor case.
It is rotatably supported in the vertical direction. The pawl 5 is adapted to engage with the teeth 3a of the ratchet wheel 3 by rotating the lever 6 upward.

A projection 6a projecting downward is provided on the central lower surface of the lever 6. This protrusion 6a.

It is adapted to come into contact with the upper surface of a weight 8 constituting the deceleration sensor. The weight 8 is swingably supported on the support base 7 by a protruding support portion 8a provided on the lower surface thereof.

In a locking mechanism configured in this way, normally a single i! 8 is held in a vertical position, and the lever 6 is supported substantially horizontally with its protrusion 6 a in contact with the center of the upper surface of the weight 8 . Therefore, the pawl 5 is separated from the ratchet wheel 3,
The ratchet wheel 3 is rotatable.

In this state, when a tensile force is applied to the webbing 4,
The take-up shaft 2 rotates counterclockwise against the biasing force of the spring, and the webbing 4 is easily pulled out from the retractor 1. Further, when the webbing 4 becomes slack, the winding shaft 2 rotates clockwise due to the biasing force of the spring, and the webbing 4 is wound up.

When the vehicle suddenly decelerates due to a collision, etc., an inertial force is acting on the weight 8, so as shown in the same figure (B),
The weight 8 swings forward about the protruding support portion 8a. As a result, the lever 6 is pushed up by the upper surface of the weight 8 and rotated upward, and the pawl 5 is moved to the ratchet wheel 3.
It engages with the teeth 3a of. At this time, a tensile force is applied to the webbing 4, and the ratchet wheel 3 is about to rotate counterclockwise, so that the teeth 3a and pawl 5 are firmly connected as shown in FIG. They will mesh together.

In this way, the counterclockwise rotation of the ratchet wheel 3 is locked, and the webbing 4 is prevented from being pulled out from the retractor 1.

(Problems to be Solved by the Invention) By the way, in an automatic low-row seatbelt device equipped with such a locking mechanism, when the belt is removed for getting on and off, etc., the tongue plate is removed from the buckle and the belt is removed. When the tongue plate or the webbing 4 is released, the webbing 4 is wound up and stored on the winding shaft 2 of the retractor 1, but the winding speed at that time may become rapid. In such a case, when the tongue plate reaches a winding end state in which it engages with a through ring or the like attached to the vehicle body, the webbing 4 may become strongly tensed and a shock may be applied to the retractor l. Although it is rare, the weight 8 swings due to the impact, and the claw 5
may engage with the teeth 3a of the ratchet wheel 3. When the locking mechanism operates in this way, the webbing 4 is under tension, so the ratchet wheel 3's 4
3a is strongly engaged with the claw 5, and even after the weight 8 returns to the vertical state, the locked state is maintained as shown in FIG. 7(C). This phenomenon is called end lock.

If such an end lock occurs, the next time the seat belt is to be used, the webbing 4 will not be pulled out from the retractor l. In such a case, pull the webbing 4 strongly and tighten the winding shaft 2.
After pulling out the webbing 4 a little by tightening the winding tightly, if the retractor 1 is rotated in the winding direction of the webbing 4, the pawl 5 and the ratchet wheel 3
Since the lever 6 disengages from the teeth 3a, the lever 6 falls and returns to the state shown in FIG. 7(A). Therefore, this end lock can be released relatively easily.

However, it is troublesome to have to perform such a release operation every time an end lock occurs.Therefore, it is necessary to prevent the lock mechanism from working when there is a risk of an end lock occurring. desired.

Similarly, there is also an automatic locking seatbelt device equipped with a canceling mechanism that keeps the locking mechanism inactive under certain conditions.

Some things have already been proposed. For example, Japanese Patent Application Laid-open No. 5
Japanese Patent No. 1-10525 discloses a device in which the pawl is held in a position where it does not engage with the ratchet wheel when opening a door or using a handbrake. Also,
Utility Model Application No. 55-151354 No. 1, Utility Model Application No. 5fl-
Japanese Patent No. 152447 and the like disclose a device in which the swinging of the sensor is stopped when the door is opened. These cancellation mechanisms use link mechanisms and cam mechanisms.
It is designed to operate in conjunction with opening a door or operating the handbrake.

However, since the seat belt may be removed when the door is closed or the handbrake is released, the end lock described above cannot be avoided with the seat belts described in these publications. However, with a link mechanism or a cam mechanism, it is difficult to operate the cancel mechanism in conjunction with a state where end lock may occur.

The present invention has been made in view of such problems, and its purpose is to reliably prevent end locking that may occur when the seatbelt is removed in an automatic locking seatbelt device. It is to do so.

] In order to achieve this object, the present invention includes a buckle switch that detects that the tongue plate is removed from the buckle and issues a signal, and a buckle switch that receives the signal from the buckle switch. A cancel mechanism is provided which operates when the

As the buckle switch, one that is normally equipped for generating an alarm to prevent forgetting to fasten the seat belt can be used. Further, the canceling mechanism may be one in which a solenoid or the like is used to hold the pawl or the sensor in an inoperative position.

: Effect) With this configuration, when the tongue plate is removed from the buckle in order to unfasten the seat belt, a signal is emitted from the buckle switch, and the canceling mechanism is activated.
The locking mechanism is held inactive. Therefore, when the tongue plate or the webbing is released in this state, even if the webbing is rapidly wound up and a shock is applied to the retractor, the locking mechanism will not operate. In other words, there is no possibility of end lock occurring.

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

In the drawings, FIG. 1 is a schematic perspective view showing one embodiment of an automatic locking seat belt device according to the present invention, and FIGS. 2 to 4 are a locking mechanism and a canceling mechanism of a retractor used in the seat belt device. FIG. 2 is a perspective view, a front view, and a side view. Further, FIG. 5 is a control circuit diagram for operating the canceling mechanism, and FIG. 6 is an explanatory diagram for explaining the operation of the canceling mechanism.

As is clear from FIG. 1, this seat belt installation 910
This is a three-point seat belt device, and includes a shoulder belt 11 and a waist belt 12. The webbings 13 and 14 of these shoulder belts 11 and waist bells 12 have one end that is
A tractor 16゜17 is installed at the rear of the lower part of the door 15.
It is designed so that it can be wound up respectively. The other end of the webbing 13 of the shoulder belt 11 is connected to a retractor 16.
pulled upwards from

It is bent toward the inside of the vehicle through a through ring 18 provided at the top of the door 15. Further, the other end side of the webbing 14 of the waist belt 12 is pulled out downward from the retractor 17 and led out from the lower part of the door 15 to the inside of the vehicle. The end portions of these webbings 13 and 14 on the vehicle interior side are fixed to one common tongue plate. The tongue plate 19 is secured to the removable portion by being inserted into a buckle 20 attached to a floor panel in the center of the vehicle interior.

The retractors 16, 17 are of virtually identical construction. Therefore, only the glue tractor 16 for the shoulder bell) 11 will be described here.

As is clear from FIGS. 2 to 4, a locking mechanism 21 similar to the aforementioned locking mechanism shown in FIG. 7 is provided inside the retractor 16. That is, this lock mechanism 21
The actuator lever 25 includes a ratchet wheel 23 that rotates integrally with the webbing take-up shaft 22, an actuator lever 25 that has a pawl 24 at its tip that engages with the ratchet wheel 23, and a deceleration lever that swings due to inertia when the vehicle suddenly decelerates. It is constituted by a weight 26 of the sensor. An intermediate portion of the lever 25 near the rear end is supported by a pin 29 on a support base 28 provided on the retractor case 27, and is rotatable in the vertical direction. The rear end is formed as an arm engaging portion 25a.

A cancel lever 30 is provided on the outer surface of the retractor case 27. The base end of the lever 30, that is, the left end in FIG. 3, is supported by a pin 31 attached to the retractor case 27 so as to be rotatable in the vertical direction. Further, an arm 33 is integrally provided at the tip of the lever 30 and extends into the inside of the retractor case 27 through an opening 32 formed in the case 27. This arm 33 is configured to be able to engage with an arm engaging portion 25a at the rear end of the actuator lever 25.

A solenoid 35 that can move the plunger 34 up and down is attached to the retractor case 27. The plunger 34 is urged downward by a spring, and is pulled up against the spring when the solenoid 35 is energized. The lower end of the plunger 34 is locked in a long hole provided in the middle of the cancel lever 30 by a pin 36.

Thus, in this embodiment, these cancel levers 3
0, the arm 33, the plunger 34, and the solenoid 35 constitute a canceling mechanism 37.

A normally closed switch 38 is provided on the side of the solenoid 35, and is opened when the cancel lever 30 is rotated upward. This switch 38 is for indicating that the lock mechanism 21 is not activated.

Solenoid 35 is controlled by a circuit such as that shown in FIG. That is, a buckle switch 40 is provided in the power supply circuit connecting the battery 39 and the solenoid 35. This bar switch 40 is attached to the buckle 20 in order to issue an alarm when the seat belt device 10 is not worn.
When the tongue plate 19 is locked, it is turned off, and when the tongue plate 19 is removed, it is turned on. Further, a type 41 is provided between the buckle switch 40 and the solenoid 35. This timer 41 is designed to conduct the circuit for a certain period of time, for example, 30 seconds after the buckle switch 40 is turned on.

Next, the operation of the seat belt device 10 configured as described above will be explained.

When the tongue plate 19 is locked to the buckle 20 with the door 15 closed, a shoulder belt 11 and a waist belt 12 are placed around the shoulders and waist of the occupant seated on the seat, respectively.
webbing 13.14 is hung. When the occupant moves his or her body for driving operations or the like, the webbings 13, 14 are smoothly pulled out from the tractor 16, 17. Therefore, it does not interfere with driving operations, etc. Moreover, the slack of the webbing 13.14 is absorbed by being wound up by the tractor 18.17, and the webbing 13.14 is always maintained in a constant tension state.

When the vehicle suddenly decelerates due to a collision etc. while driving, the locking mechanism 21 in the retractor 16, 17 is activated and the webbing 1
The rotation of the ratchet wheel 23 in the withdrawal direction of 3.14 is locked. Thereby, webbing 13.
14 is prevented from being pulled out, and the occupant is securely restrained.

When removing the seat belt device 10 from the vehicle body for getting on and off, etc., the tongue plate 19 is removed from the buckle 20, and the webbings 13, 14 are removed from the retractor 16.
17 and becomes taut along the door 15 between its upper and lower sides. At this time, webbing 13°1
4 is rapidly wound up and under tension, a shock may be applied to the retractor 16,17.

However, in this case, by removing the tongue plate 19 from the buckle 20, the buckle switch 40
turns on. Therefore, solenoid 35 is energized. Then, since the plunger 34 is attracted, the cancel lever 30 is rotated upward. And Fig. 6 (A
), the arm 33 at the tip of the lever 30 engages with the arm retaining portion 25a at the rear end of the actuator lever 25, and presses the retaining portion 25a from below. As a result, the tip side of the actuator lever 25 attempts to rotate downward about the pin 29, pressing the upper surface of the weight 26.

In this way, the weight 26 is fixed and the pawl 24 is held at a position away from the ratchet wheel 23. Therefore, the locking mechanism 21 is held in an inoperative state, and locking due to impact at the end of winding the webbing 13, 14, that is, end locking is prevented.

End lock can normally occur only for a short period of time after the tongue plate 19 is removed from the buckle 20. Therefore, after the time set in the timer 41, for example 30 seconds, has elapsed, power supply to the solenoid 35 is stopped, thereby preventing overconsumption of the battery 39. In order to prevent the door 5 from locking due to impact when opening and closing, it is sufficient to separately provide a canceling mechanism similar to the conventional canceling mechanism.Furthermore, the solenoid 35 of the above embodiment is also actuated by the door opening signal. It is also possible to do so.

Even within the set time of timer 41, tongue plate 1
When the buckle 9 is engaged with the buckle 20, the energization to the solenoid 35 is stopped. Then, when the power supply to the solenoid 35 is stopped, the plunger 34 is lowered by the urging force of the spring. Therefore, the cancel lever 30 is rotated downward, and the arm 33 is moved to the actuator lever 2.
Stay away from 5. It is then held in that state. In this state, as shown in FIG. 6(B), the actuator lever 25 can freely move up and down, and the weight 26 can freely swing. In other words, the lock mechanism 21 is activated again.

In the above embodiment, the canceling mechanism 37 is provided on both the shoulder belt 11 glue tractor 16 and the waist belt 12 glue tractor 17, but this canceling mechanism 37 is provided only in one of the retractors 16 and 17. It may also be provided.

In addition, the webbing 13 of the shoulder bell) 11 and the webbing 14 of the waist belt 12 are separated, and each is attached to the retractor 1.
6.17, but the webbing 13 and 14 may be made into one piece, one end of which is wound up by the retractor 16 or 17, and the other end fixed to the door 15 or the like. In that case,
The tongue plate (19) may be attached to the webbing in a sliding manner.

Further, in the above embodiment, retractors 16, 17 are attached to the door 15. By doing so, the tongue plate 19 is attached to the buckle 20.
When the door 15 is opened with the webbing 13.
14 moves in front of the occupant. Therefore, passengers can easily get on and off the vehicle. Furthermore, when the user sits on the seat and closes the door 15, the shoulder belt 11 and waist belt 12 are automatically put into a worn state. In other words, it can also be used as a passive seat belt device. However, the present invention is not limited thereto, and can also be applied to a fully active seat belt device in which retractors 16, 17 are attached to the vehicle body. Alternatively, a two-point seat belt device may be used.

Alternatively, the canceling mechanism 37 may be one in which the actuator lever 25 or the weight 26 is directly attracted and fixed by a magnet. Further, the present invention can also be applied to cases where a pendulum-like deceleration sensor whose upper end is suspended, a pole-like deceleration sensor that moves along a guide road surface, etc. are used.

(Effects of the Invention) As is clear from the above description, according to the present invention, when the tongue plate is sensed to be removed from the buckle, the canceling mechanism is activated and the locking mechanism is held in an inoperative state. Therefore, even if an impact is applied to the retractor when the retractor finishes winding up the webbing, the lock mechanism is prevented from operating due to the impact. Therefore, occurrence of end lock can be reliably prevented.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of an automatic locking seat belt device according to the present invention, and FIG. 2 is a perspective view showing a locking mechanism and a canceling mechanism of a retractor used in the seat belt device. FIG. 3 is a front view of the locking mechanism and canceling mechanism, FIG. 4 is a side view thereof, FIG. 5 is a control circuit diagram for operating the canceling mechanism, and FIGS. ) is an explanatory diagram for explaining the action of the canceling mechanism, and FIGS. 7(A), (B), and (C) are explanatory diagrams for explaining the action of the locking mechanism. 10... Seat belt device 13.14... Webbing 16.17... Retractor 19... Tongue plate 20... Buckle 21... Lock mechanism 22... Webbing take-up shaft 23... Ratchet wheel 24... pawl 25...
... Actuator lever 26 ... Weight (sensor) 30 ... Cancel lever 33 ... Arm 3
4... Plunger 35... Solenoid 37... Cancellation mechanism 40... Buckle switch 41... Timer applicant Honda Motor Co., Ltd. agent Patent attorney Hanyu Morishita Figure 2 Figure 3 Figure 4 Figure 30 33 + Figure 5 Figure 6

Claims (2)

[Claims] (1) A retractor capable of retracting one end of the webbing, and a buckle capable of locking a tongue plate attached to the other end of the webbing, and the retractor rotates integrally with the webbing retractor shaft of the retractor. a pawl that engages with the ratchet wheel to lock the rotation of the ratchet wheel in the direction of pulling out the webbing; and a pawl that moves in response to sudden deceleration of the vehicle to lock the pawl into the ratchet. In an automatic locking seat belt device, the locking mechanism is provided with a sensor that engages a wheel; and a buckle switch that detects that the tongue plate is removed from the buckle and issues a signal; and the buckle switch. An automatic locking seatbelt device, comprising: a canceling mechanism that holds the locking mechanism in an inoperative state in response to a signal from the automatic locking seatbelt device. (2) The automatic according to claim 1, further comprising a timer that sends a signal from the buckle switch to the canceling mechanism only for a certain period of time after the tongue plate is removed from the buckle. Locking seat belt device.