JPS6037864Y2 - webbing lock device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a webbing lock device used in a seat belt device of an automobile or the like to lock an occupant restraining webbing.

The seatbelt device is designed to have occupant restraint webbing attached to the occupant, and one end of this webbing is wound up by a biasing force onto a winding device attached to the vehicle body to create tension in the middle of the webbing. It has become.

Additionally, this winding device is equipped with a webbing lock device that allows the webbing to be unwound while the vehicle is normally running, but in the event of a vehicle emergency, the webbing is abruptly stopped and the occupant is restrained by the webbing. .

This webbing lock device fixes a ratchet foil to the winding shaft that winds the end of the webbing, and engages a lock bar driven by an acceleration detection device with the ratchet wheel to rotate the ratchet wheel and winding shaft to unwind the webbing. It is designed to stop.

However, in such a webbing lock device,
Before the lock bar driven by the acceleration detection device can securely engage the ratchet wheel, the tooth tip of the lock bar collides with the tooth tip of the ratchet wheel, the lock bar is repelled by the ratchet wheel, and the lock bar engages with the ratchet wheel again. Since it takes a long time for the ratchet wheel and the take-up shaft to engage with each other and reliably stop the webbing unwinding rotation, there is a possibility that the webbing will not be locked completely.

The present invention takes the above-mentioned facts into account, and an object of the present invention is to provide a webbing lock device that can quickly engage the lock bar with the ratchet foil even when the lock bar is repelled from the ratchet foil.

In the webbing lock device according to the present invention, the lock bar support part of the acceleration detection device and the lock bar are provided with magnetized parts to repel each other, and the lock bar is suspended and supported from the acceleration detection device by magnetic force, so that the lock bar is ratcheted. It is designed to absorb the impact force when it is rebound from the foil.

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

FIG. 1 shows a first embodiment of the present invention, in which a winding device 10 is provided with a frame 12 and is fixed to a vehicle body 16 with mounting bolts 14.

A pair of legs 18 extend parallel to each other from both sides of the frame 12 and pivotally support the winding shaft 20 (
In FIG. 1, illustration of one leg 18 is omitted.

) One end of the webbing 22 for restraining an occupant is wound in a layer on the winding shaft 20, and the other end (not shown) of the webbing 22 is used for restraining the occupant.

The occupant can unwind the webbing 22 from the take-up shaft 20 and attach it using a tongue plate, buckle device, etc. (not shown).

A ratchet wheel 24 is fixed to the winding shaft 20 so as to rotate together with the winding shaft 20, and a lockper 26 faces the ratchet wheel 24.

In normal vehicle running conditions, the lockper 26 is connected between the ratchet wheel 24 and the IQI to enable rotation of the ratchet wheel 24 and the take-up shaft 20, but in the event of a vehicle emergency, it engages with the ratchet wheel 24 to wind the webbing of the take-up shaft 20. It is designed to stop the rotation.

The lockper 26 is composed of a metal plate-shaped bowl 28 and a synthetic resin cover 30. The base of the plate-shaped bowl 28 is covered with the cover 30, and the cover 30 is pivoted to the leg part 18 by a pin 32. has been done.

This plate-shaped bowl 28 is driven by an acceleration detection device 34 to mesh with the ratchet wheel 24.

In the acceleration detection device 34, a pendulum 38 is suspended from a bracket 36 fixed to the leg portion 18.

This pendulum 38 has a metal head 42 screwed onto a weight 40.
It is made up of.

This head 42 has its outer peripheral bottom surface connected to the through hole 4 of the bracket 36.
It is placed on a ring part 46 that stands up on the edge of 4.

Here, the axis of the pendulum 38 is approximately vertical when the vehicle acceleration is below a predetermined value, but when the vehicle acceleration exceeds a predetermined value, it swings, and the head 42 uses the contact portion with the ring portion 46 as a fulcrum. The lifting force is transmitted to the lock par 26 via a force receiving protrusion 48 placed on the head 42.

The force-receiving protrusion 48 is made of metal and is screwed onto the plate-shaped bowl 28.

Further, the opposing surfaces of the force-receiving protrusion 48 and the pendulum head 42 are magnetized so as to repel each other.

That is, the bottom surface of the force-receiving protrusion 48 facing the head 42 and the top surface of the head 42 facing the force-receiving protrusion 48 are both N-pole or S-pole so that they repel each other.

Therefore, the force-receiving protrusion 48 is repelled from the head 42 and
A slight gap (preferably about 1wn) is formed between the pendulum 38 and the pendulum 38, so that the lockper 26 is supported by the pendulum 38 in a floating state.

The operation of this embodiment configured in this way will be explained.

When a passenger gets on the vehicle, the webbing 22 is unwound from the take-up shaft 20 and attached, but in this case, since the vehicle is stopped, the lockper 26 does not stop the unwinding rotation of the take-up shaft 20, and the passenger can easily unwind the webbing 22 from the take-up shaft 20. Webbing 22 can be attached to.

Since the axis of the pendulum 38 is almost vertical even in the normal running state of the vehicle, the locking member 26 is separated from the ratchet bolt 24, and the winding shaft 20 can be rotated, allowing the occupant to arbitrarily change the driving position. can.

When the vehicle is in an emergency situation such as a collision, the pendulum 38 swings violently, so the lockper 26 receives the upward force from the head 42, and the force receiving protrusion 48 is moved to a predetermined gap with the top surface of the head 42. is rotated around the pin 32 while holding it and engages with the ratchet wheel 24.

Due to this meshing, the ratchet wheel 24 and the winding shaft 20
Since the webbing unwinding rotation is abruptly stopped and the webbing 22 is locked, the occupant is restrained and safety is guaranteed.

However, since the occupant wearing the webbing 22 is violently thrown in the direction of the collision due to inertia, the ratchet wheel 24 rapidly rotates in the webbing unwinding direction, and in order to engage with the rotating ratchet wheel 24, the ratchet wheel 24 rotates around the pin 32. The tips of the teeth of the rotating plate-shaped bowl 28 may collide with each other, and this collision causes the lockper 2
6 may be repelled in a direction away from the ratchet wheel 24 around the pin 32.

The pendulum 3 receives the rotational force of the lock par 26 due to this repulsion.
8 is moved in a direction that reduces its swing angle, the upward force that the plate bowl 28 has to receive from the pendulum 38 decreases.

However, in this embodiment, the force-receiving protrusion 48 of the plate-shaped bowl 28 is suspended by magnetic force with the head 42, so when the lock bar 26 receives an impact force around the pin 32 in the direction of separating from the ratchet foil 24, the force-receiving protrusion 48 is suspended. The protrusion 48 acts as if a shock absorber exists between it and the head 42, and the pendulum 38 is rarely moved in a direction that reduces its swing angle.

That is, since a slight gap is formed between the force-receiving protrusion 48 and the head 42, the impact force received by the plate-shaped bowl 28 instantaneously reduces this gap or causes the plate-shaped bowl to come into close contact with the plate-shaped bowl 28. The impact force received by the pendulum 28 is alleviated, and the impact force transmitted to the pendulum 38 is significantly reduced.

As a result, the pendulum 3 continues to detect the collision acceleration of the vehicle body.
Immediately thereafter, the lock bar 26 is pushed up again around the pin 32 and engaged with the next tooth of the ratchet wheel 24, so that the unwinding rotation of the winding shaft 20 is abruptly stopped and the safety of the occupant is ensured.

Next, FIG. 2 shows a second embodiment of the present invention, and shows another embodiment of the acceleration detection device.

In this embodiment, a rolling pole 50 is housed in a dish 52 in order to detect acceleration, and the pole 50 moves up a mortar-shaped slope 50 of the dish 52 when it receives acceleration of a predetermined value or more. It is supposed to be done.

This upward force of the pole 50 is converted into a vertical upward force of the detection protrusion 54 placed on the pole 50.
is adapted to rotate the bowl 28 via the force receiving protrusion 48.

In this embodiment as well, the detection protrusion 54 and the force-receiving protrusion 48 are magnetized so as to repel each other, and the bowl 28 is suspended by magnetic force so as to absorb the impact force received by the collision with the ratchet foil. It has become.

Next, FIG. 3 shows a third embodiment of the present invention, in which an interlocking lever 56 is interposed on the pendulum 38, and the lock bar 26 is connected to the pendulum via this interlocking lever 56. It is designed to receive rocking force.

The interlocking lever 56 is pivotally supported by the leg portion 18 by a pin 58, and the intermediate portion thereof is placed on the head portion 42 of the pendulum, and a magnetized protrusion 60 is fixed to the tip portion, and the bottom surface of the plate-shaped bowl 28 is attached to the interlocking lever 56. It faces the magnetized member 62 fixed to.

Therefore, in this embodiment as well, the bowl 28 is supported in a floating state by the acceleration detection device, and the ratchet wheel 24
It can absorb the impact force from

In addition to the above embodiments, various modifications can be applied,
Any device that allows the lock bar to be supported in a floating state by magnetic force to the acceleration detection device is applicable.

Further, the acceleration detection member is not limited to the embodiment, but may also include other vehicle acceleration detection members, and is not limited to one that detects vehicle acceleration, but may also be an acceleration detection device that detects the acceleration of unwinding the webbing from the winding shaft and transmits it to the lock bar. It is applicable even if there is.

As explained above, the webbing lock device according to the present invention allows the lock bar to be supported by the acceleration detecting device in a floating state due to magnetic force, thereby eliminating lock errors caused by the lock bar being repelled by the teeth of the ratchet wheel in the event of a vehicle emergency, thereby eliminating the need for occupant safety. It has excellent effects that can improve safety.

Furthermore, since the lock bar is supported in a floating state, the frictional resistance between the lock bar and the acceleration detection device can be reduced, and it is also possible to eliminate abnormal noise caused by contact.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the first embodiment of the webbing lock device according to the present invention, and FIGS. 2 and 3 are the second and third embodiments of the present invention, respectively.
FIG. 3 is a partially enlarged view showing a third embodiment. 10... Winding device, 20... Winding shaft,
22... Webbing lock device, 24...
...Ratchet foil, 26...Tatsukuba 3
4... Acceleration detection device, 38... Pendulum, 42... Head, 48... Force receiving protrusion,
50... Rolling pole, 54... Detection protrusion, 56... Interlocking lever, 60... Magnetized protrusion, 62... Magnetized member .

Claims (1)

[Scope of utility model registration request] In a webbing lock device in which unwinding of occupant restraint webbing is locked by a lock bar driven by an acceleration detection device meshing with a ratchet wheel, the lock bar support portion of the acceleration detection device and the lock bar repel each other. A webbing lock device characterized in that a magnetized portion is provided and a lock bar is suspended and supported from an acceleration detection device by magnetic force.