JPS628207Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is used in a seat belt device for protecting occupants in vehicle emergencies, and stops the unwinding of occupant restraint webbing in vehicle emergencies to place the occupant in a restrained state. The present invention relates to a webbing take-up device.

[Conventional technology]

In a seatbelt device, a webbing with one end wound around a retracting shaft is attached to the occupant, and in the event of a vehicle emergency, a locking means is activated by an acceleration sensor to prevent the webbing from unwinding, and the occupant is restrained by the webbing to ensure the safety of the occupant. is gradually improving.

[Problem to be solved by the invention] In this way, in the seat belt device, the restraint webbing is designed to stop unwinding from the take-up shaft only in an emergency. The webbing can be freely unwound from the take-up shaft and the driving position can be changed.

However, problems arise due to the fact that the webbing can be freely unwound from the take-up shaft under normal vehicle running conditions. In other words, if the occupant restraint webbing is attached to luggage placed on the seat, or to protection devices for infants or child occupants, when the vehicle is driven, these luggage, etc. will be damaged by the relatively small starting acceleration, stopping acceleration, centrifugal force, etc. of the vehicle. The webbing, which moves by inertia and can be unwound, has the disadvantage that it cannot prevent the movement of these items.

Taking the above facts into consideration, the present invention allows the unwinding of webbing to be stopped in the event of a vehicle emergency, and also allows the occupant to manually stop the rotation of webbing unwinding from the winding shaft when necessary. It is an object of the present invention to provide a webbing retractor that can automatically release the stoppage of webbing unwinding rotation.

[Means for solving problems]

In order to achieve the above object, the present invention includes a webbing retractor that includes a webbing retractor for occupant restraint, a webbing retractor, a locking means for preventing the webbing unwinding rotation of the retractor shaft, and a locking means for preventing the webbing unwinding rotation of the retractor shaft. a lock rod that forcibly operates the locking means; a lock piece that engages with the lock rod in the operating position of the lock rod to maintain the lock rod in the operating position; and a lock piece that receives the rotation of the winding shaft by frictional force. a drive protrusion provided on the friction plate that engages with the lock piece to separate the lock piece from the lock rod and move the lock rod to a non-operating position when the take-up shaft rotates to wind up the webbing; The present invention is characterized by having a configuration having the following.

[Effect]

In this configuration, by manually moving the lock rod to the operating position by the occupant, the lock means forcibly prevents the webbing unwinding rotation of the take-up shaft, and the lock piece engages with the lock rod. The operating position of the locking bar is maintained, thereby stopping the unwinding rotation of the webbing. On the other hand, when winding the webbing, the lock piece is separated from the lock rod by the drive protrusion of the friction plate to which the winding rotation of the winding shaft is transmitted by frictional force, and the lock rod moves to the non-operating position, causing the webbing to unwind and rotate. The suspension will be canceled automatically.

〔Example〕

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

1 and 2 show a webbing retractor 10 according to an embodiment of the present invention, in which a base plate 12 is fixed to a vehicle body 16 with mounting bolts 14.

A pair of leg plates 18 and 20 extend parallel to each other from both sides of the base plate 12, and substantially both end portions of the winding shaft 22 are pivotally supported. One end of an occupant restraining webbing 24 is wound around the winding shaft 22 in a layered manner. The end of the winding shaft 22 passing through the leg plate 20 and the barrel 26 fixed to the leg plate 20
A mainspring spring 28 is interposed between the two and biases the take-up shaft 22 in the webbing take-up direction.

A ratchet foil 30 is provided in the middle of the winding shaft 22.
is fixed to rotate together with the winding shaft 22, and corresponds to the pawl 32. Both ends of the pawl 32 are inserted into fan-shaped openings 34 formed in the leg plates 18, 20, whereby the pawl 32 is pivotally supported on the leg plates 18, 20. The tips of the teeth of this pawl 32 are separated from the tips of the teeth of the ratchet wheel 30 due to its own weight when the vehicle is normally running, but when the pawl 32 is tilted clockwise in FIG. It is designed to stop the rotation.

This pawl 32 is placed on one end 38A of an L-shaped arm 38 which is pivotally supported to the leg plate 18 by a pin 36. One end 38A of this L-shaped arm 38 rests on the head 42 of the pendulum 40. This pendulum 40 is suspended from a bracket 44 fixed to the leg plate 18 with its axis being vertical, and when the vehicle acceleration reaches a predetermined value or more, it swings and the head 42 becomes an L-shaped arm. Paul 3 through one end 38A of
2 in the clockwise direction in Figure 1.

Here is a pendulum 40, an L-shaped arm 38, and a pole 3.
2 and the ratchet wheel 30 constitute a locking means for the winding shaft 22. The other end 38B of the L-arm 38 is adapted to be driven by a locking rod 46. That is, the lock rod 46 has its axial center horizontally set by a guide 48 fixed to the leg plate 18, and is arranged in the tangential direction of the winding shaft 22 so as to be movable in the axial direction.

One end of this locking rod 46 is an enlarged handle 50, and the occupant can press this enlarged handle 50 to push the locking rod 46 into the winding device 10. The lock rod 46 is in its non-operating position as shown in FIG. 1, and is in its operating state when it is pushed into the winding device 10 toward the right in FIG.

A compression coil spring 52 is interposed near the tip of the lock rod 46 between it and the base plate 12 to bias the lock rod 46 toward the non-operating position. Further, a lock plate spring 54 is fixed to the vicinity of the tip of the lock rod 46 by a rivet 56. The middle part of this lock leaf spring 54 is a guide 48.
The L-shaped arm 38 passes through an opening 58 drilled in the
The U-shaped tip is in contact with one end 38B of the L-shaped arm 38.

As a result, the locking rod 46 does not rotate the L-shaped arm 38 in the non-operating position, but when it reaches the locked position, the locking bar 46 rotates the L-shaped arm 38 clockwise in FIG. 1 via the locking leaf spring 54. The pawl 32 is rotated to force the locking means into an activated state, that is, the pawl 32 is tilted into engagement with the ratchet wheel 30.

On the other hand, a serrated notch 60 is provided in the middle of the locking rod 46.
is bored and corresponds to the lock piece 62. This lock piece 62 is disposed within a guide 64 fixed to the leg plate 18, and the engaging claw 68 is engaged with the lock rod 4 by the biasing force of a compression coil spring 66.
It is biased in six directions. This engaging pawl 68 has a shape corresponding to the notch 60 of the lock rod, and when the lock rod 46 is in the operating position, it engages with the notch 60 by the biasing force of the compression coil spring 66 and locks the lock rod 46. It is designed to be held in the operating position and prevented from returning to the non-operating position.

This lock piece 62 has a force receiving protrusion 70 protruding toward the winding shaft 22 at an intermediate portion thereof, and corresponds to the driving protrusion 74 of the friction plate 72. As shown in FIG. 3, this friction plate 72 is shaped like a disk, and is pivotally supported on the winding shaft 22, and a compression coil spring 76 is interposed between it and the leg plate 18. The force causes frictional contact with the ratchet foil 30 as shown in FIG. Therefore, the rotational force of the winding shaft 22 is transmitted to the friction plate 72 through the frictional force between the friction plate 72 and the ratchet wheel 30 when the winding shaft 22 rotates. This friction plate 7
2 drive protrusion 74 extends from the outer periphery of the friction plate to the winding shaft 2.
2, and its tip portion interferes with the force-receiving protrusion 70 of the lock piece 62 during rotation. The force transmitted by the driving protrusion 74 to the lock piece 62 via the force receiving protrusion 70 is large enough to resist the biasing force of the compression coil spring 66 and separate the lock piece 62 from the lock rod 46.

The operation of this embodiment configured as described above will be described. The occupant unwraps and puts on the webbing 24, and thereby comes into a seatbelt wearing state.

When the vehicle is in an emergency situation such as a collision, the pendulum 40 detects the large acceleration generated in the vehicle and swings, causing the head 42 to tilt the pole 32 via the L-shaped arm 38. Ratchet foil 3
0, the unwinding rotation of the winding shaft 22 is stopped instantaneously, and the occupant is securely restrained by the webbing 24, ensuring safety.

On the other hand, in the normal running state of the vehicle, the axis of the pendulum 40 is vertical, so the pawl 32 is separated from the ratchet wheel 30, and the occupant can arbitrarily unwind the webbing 24 from the take-up shaft 22 to change the driving posture. be able to.

It is also possible to attach the webbing 24 to the seat by wrapping it around luggage placed on the seat, a child occupant restraint device, etc. In this case, the pendulum 40 does not tilt the pawl 32 under relatively weak accelerations such as normal vehicle starting and stopping, so the ratchet wheel 30 and take-up shaft 22 can rotate to unwind the webbing, and the baggage etc. There is a risk of falling from the seat.

In this case, when the occupant presses the enlarged handle 50 and pushes the locking rod 46 into the winding device 10, the locking rod 46 becomes the operating position and the locking plate spring 54 is moved through one end 38B of the L-shaped arm 38. Rotate it clockwise in Figure 1 around the pin 36. This rotation of the L-shaped arm causes the bowl 32 to engage with the ratchet wheel 30, and the webbing unwinding rotation of the take-up shaft 22 is stopped, so that the webbing 24 reliably fixes the baggage etc. onto the seat.

In such a webbing unwinding locked state, the friction plate 72 rotates in the webbing unwinding direction (counterclockwise in FIG. 1) by the unwinding operation of the webbing 24 for wrapping around luggage, etc., and the drive protrusion 74 is in contact with the force-receiving protrusion 70 or is stopped near the force-receiving protrusion 70 .

If the webbing 24 is loose inside the vehicle in the webbing unwinding locked state, it is necessary to wind the webbing 24 onto the take-up shaft 22 in order to eliminate this slack. In this case, the webbing winding rotation of the winding shaft 22 (clockwise in Figure 1) causes the ratchet wheel 30 to push down the pawl 32 and rotate the L-shaped arm 38 around the pin 36 in the counterclockwise direction in Figure 1. However, since a lock leaf spring 54 is interposed between the L-shaped arm 38 and the lock rod 46, the lock leaf spring 54 can bend and absorb the rotation of the L-shaped arm 38, and the lock rod 46 can be bent. remains in its operating position.

When the occupant releases the webbing 24 from wrapping around the baggage, etc. and winds it onto the take-up shaft 22, the friction plate 72 also rotates in accordance with the winding rotation of the take-up shaft 22, so the drive protrusion 74 is The lock piece 62 comes into contact with the force protrusion 70 and escapes from the notch 60 of the lock rod 46. Therefore, the lock rod 46 returns to the non-operating position by the biasing force of the compression coil spring 52, and the L-shaped arm 38 rotates about the pin 36 and returns to the state shown in FIG. 32 is also separated from the ratchet wheel 30 and the locked state is released.

Although the pendulum 40 was used as the acceleration sensor in the above embodiment, it is needless to say that it is possible to use not only the pendulum but also various kinds of acceleration sensors. It is also possible to provide one or more stoppers to regulate the rotation angle of the friction plate 72.

[Effect of idea]

As explained above, the webbing retractor according to the present invention is set to the operating position by manual operation by the occupant, and the locking rod that forcibly operates the unwinding rotation lock means is engaged with the lock piece to maintain the operating position. The crew member can arbitrarily stop the webbing unwinding rotation of the take-up shaft by simply moving the lock rod to the operating position, and by receiving the rotational force of the take-up shaft through frictional force, the lock piece can be removed from the lock rod when the webbing is being wound. Since the drive protrusion is provided to separate the webbing, it has an excellent effect that the webbing unwinding lock state is automatically canceled by simply releasing the webbing from the baggage or the like and winding the webbing onto the take-up shaft.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a webbing retractor according to the present invention, FIG. 2 is a cross-sectional view taken along the line shown in FIG. 1, and FIG. 3 is a perspective view showing a friction plate and a compression coil spring. 10... Webbing winding device, 22... Winding shaft, 24... Webbing, 30... Ratchet foil, 32... Paul, 38... L-shaped arm, 4
0... Pendulum, 46... Lock rod, 62... Lock piece, 72... Friction plate, 74... Drive protrusion.

Claims (1)

[Scope of utility model registration request] a take-up shaft for webbing for occupant restraint; a lock means for preventing the take-up shaft from unwinding the webbing;
a lock rod that is brought into an operating position by a passenger's manual operation and forcibly operates the locking means; a lock piece that engages with the lock rod in the operating position of the lock rod to maintain the lock rod in the operating position; and the winding shaft. a friction plate that rotates by receiving the rotation of the webbing by frictional force, and a friction plate provided on the friction plate that engages with the lock piece when the winding shaft rotates to wind up the webbing, and separates the lock piece from the lock rod to deactivate the lock rod. A webbing retractor having a drive projection for moving the webbing to a position.