JPS6226285Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a webbing lock device that is used in a seat belt device for protecting an occupant in a vehicle emergency and locks the webbing to ensure the restraint of the occupant in a vehicle emergency.

[Conventional technology and its problems]

In a seatbelt device, the end of the webbing for occupant restraint that is attached to the vehicle body is wound around the take-up shaft with a predetermined biasing force, thereby applying appropriate tension to the middle part of the webbing, keeping the occupant in close contact with the webbing, and making it easier for the occupant to avoid webbing. When the attachment is released, the remaining webbing is wound onto the take-up shaft to prevent the webbing from being scattered inside the vehicle.

This seat belt device has a structure in which a ratchet foil is fixed to the winding shaft, and by engaging a pawl activated by an acceleration sensor to the ratchet wheel, the webbing unwinding rotation of the winding shaft is stopped only in the event of a vehicle emergency. . However, even after the take-up shaft stops rotating to unwind the webbing, a so-called tightening state occurs in which the webbing wound in layers on the take-up shaft is pulled out by the large tension of the webbing that occurs in a vehicle emergency. It has been pointed out that there is a problem in which the occupants are not fully restrained.

As a countermeasure to this problem, a webbing lock device has been proposed that directly clamps and locks the middle part of the webbing in the event of a vehicle emergency, but since a large tension is generated in the webbing in a vehicle emergency, the webbing tension changes rapidly at this clamped part. There is a risk that the webbing may be damaged.

The present invention takes the above facts into account, and even in a webbing lock device that clamps and locks the middle part of the webbing in the event of a vehicle emergency, there is no large tension change in the clamped part, thereby preventing the webbing from breaking and protecting the occupants. It is an object of the present invention to provide a webbing lock device that can reliably put the webbing in a restrained state.

[Means for solving problems]

The present invention comprises a frame, a take-up shaft that is pivotally supported by the frame, and winds up the end of the occupant restraint webbing;
a rotatable first roller that is pivotally supported by the frame and around which an intermediate portion of the webbing unwound from the take-up shaft is wound; and a resistance imparting means that applies rotational resistance to the first roller when the tension of the webbing increases. , an arm that is pivotally supported by the frame with a common shaft with the first roller and whose free end rotates when the tension of the webbing increases; and a first arm that is provided closer to the take-up shaft than the first roller of the arm. a first locking means in which a movable locking portion of the webbing approaches a first fixed locking member supported by the frame when the arm rotates to clamp the webbing between the take-up shaft and the first roller; A second roller rotatably supported on the free end side of the arm, and a second movable lock member provided between the first roller and the second roller of the arm are connected to the frame when the arm rotates. A second lock member that approaches the supported second fixed lock member and clamps the webbing between the roller and the occupant restraint part.
A webbing lock device having a locking means.

[Effect]

When tension is applied to the webbing during a vehicle emergency, the free end of the arm pivots. As a result, the webbing is clamped by the second locking means. At the same time, the tension applies the resistance applying means to apply rotational resistance to the first roller. When the arm further rotates, the clamping force of the webbing by the second locking means and the rotational resistance of the first roller increase, the webbing is clamped by the first locking means, and the tension applied to the webbing is reduced.

〔Example〕

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

1 and 2 show an embodiment in which a webbing lock device according to the present invention is applied to a webbing take-up device 10. This webbing retractor 10
The frame 12 is attached to the vehicle body 16 by the mounting bolts 14.
It is fixed to.

From both sides of this frame 12 are a pair of leg plates 1.
8 and 20 extend parallel to each other, and the winding shaft 2
2 is pivoted near both ends. This winding shaft 2
An end portion of an occupant restraining webbing 24 is secured to the center portion of the webbing 2 and wound in layers. The other end of the webbing 24 serves as an occupant restraint section 26, which allows the occupant to attach the webbing by means of an engaging tool such as a tongue plate or a vector device (not shown). Also, the leg plate 2 of the winding shaft 22
A mainspring spring 28 is interposed between the end protruding from the base plate 20 and the leg plate 20, and urges the winding shaft 22 in the winding direction of the webbing 24 (in the direction of arrow A in FIG. 1).

A ratchet wheel 30 is fixed to the winding shaft 22 so as to rotate together with the winding shaft 22, and corresponds to a pawl 32 pivotally supported on the leg plates 18, 20. Part of this pole 32 is a pendulum 3
It is placed on the head 36 of No. 4. This pendulum 34
is suspended from a bracket 38 fixed to the frame 12, and its axis is vertical when the vehicle is normally running, but when the vehicle is in an emergency, it swings in response to vehicle acceleration and pushes up the pawl 32. ing.

This pawl 32 is located at the head 36 of a pendulum 34 whose center of gravity is set so that it is separated from the ratchet wheel 30 by its own weight when the vehicle is normally running.
When pushed up, it tilts and engages with the ratchet wheel 30 to stop the webbing unwinding rotation of the ratchet wheel 30 and the winding shaft 22. Note that it is also possible to use other acceleration sensors in place of the pendulum 34.

A support shaft 40 is provided below the pendulum 34 on the leg plates 18 and 20.
An arm 42 is pivotally supported via. To explain in detail the shaft support structure of this arm 42, the third and fourth
As shown in the figure, the support shaft 40 passes through the leg plates 18 and 20, and a pair of flanged bushes 44 are inserted in the middle thereof with a predetermined gap. A holder 46 having a substantially U-shaped cross section is pivotally supported on the outer periphery of each of the bushes 44 with flanges. These bushes 44 are made of an elastic body and are inserted into a circular hole 48 formed at one end of the arm 42. Therefore, the arm 42 is the holder 4
6 and a bush with a flange 44 to a support shaft 40, and is rotatable around this support shaft 40.

A first roller 50 is provided on the outer periphery of the bushing 44 with a flange.
Both ends of the roller 50 are supported by a shaft, and a slight gap is formed between the outer periphery of both ends of the roller 50 and the inner periphery of the holder 46. Under normal running conditions of the vehicle, frictional resistance from the holder 46 is generated during rotation. Care has been taken to ensure that no force is applied. Therefore, the webbing 24, which is wound around the outer periphery of the roller 50 after being unwound from the winding shaft 22, is smoothly guided by the rotation of the roller 50 when the vehicle is normally running. When the bush 44 is deformed by its elastic force, the outer periphery of both ends of the roller 50 comes into contact with the inner periphery of the holder 46 and receives frictional resistance. Therefore, this bush 44
The holder 46 constitutes a means for applying resistance to the roller 50.

On the other hand, a circular hole 52 is also bored in the other end of the arm 42, and a holder 54 and a flange bushing 56 similar to the holder 46 and flange bushing 44 are disposed therein, and a second roller 58 is pivotally supported. The webbing 24 is wrapped around and guided between the first roller 50 and the occupant restraint section 26. However, the pin 60 passing through the shaft center of this bushing with flange 56 is connected to the support shaft 4.
The length in the axial direction is shorter than that of 0, and both ends have a slight gap between them and the leg plates 18 and 20.

A lock bar 62, which is a first movable lock member, is supported on a portion of the arm 42. A wave-shaped protrusion 64 is formed on the surface of the lock bar 62 facing the webbing, and the lock bar 62, which is the first fixed lock member spanned over the leg plates 18 and 20,
This corresponds to the waveform protrusion 68 of No. 6. These lock bars 62 and 66 constitute a first locking means, and when the vehicle is normally running, webbing 22 is inserted between them.
The arm 42 forms a gap in which the arm 42 moves.
When the waveform protrusion 64 rotates when the webbing tension increases, the waveform protrusion 64 approaches the waveform protrusion 68, and the intermediate portion of the webbing 24 is held between them.

A rectangular window 70 (FIG. 4) is formed between the first roller 50 and the second roller 58, and a lock lever 72, which is a second fixing lock member, passes through the rectangular window 70 (FIG. 4). Both ends of this lock lever 72 are connected to the leg plate 18,
20, and an elastic synthetic resin layer 74 is adhered to the side facing the webbing 24.

In addition, the rectangular window 70 of the arm 42 has webbing 2.
A lock bar 76, which is a second movable lock member, is held on the opposite side of the lock bar 2 across the lock bar 2.
A synthetic resin layer 78 is also adhered to this lock bar 76 on the side facing the webbing 24. These lock bars 72 and 76 constitute a second lock means, and when the vehicle is normally running, a gap is formed between them in which the webbing 24 moves, but when the arm 42 rotates when the tension of the webbing increases. In this case, the lock bar 76 approaches the lock bar 72 to sandwich the intermediate portion of the webbing between the synthetic resin layers 78 and 74.

It is preferable to determine the dimensions of each component so that when the arm 42 begins to rotate in the event of a vehicle emergency, the clamping by the lock bars 72, 76 occurs before the clamping by the lock bars 62, 66. In addition, the lock bars 72 and 76 do not have the role of reliably clamping and locking the webbing middle part, but are different from the lock bars 62 and 66 because their purpose is to reduce the webbing tension by applying resistance to the webbing middle part. The soft synthetic resin layers 74, 7 do not form corrugated protrusions on the surface.
8 is formed to increase the frictional resistance between the webbing 24 and the webbing 24.

Further, the surfaces of the rollers 50 and 58 may be provided with irregularities, a synthetic resin coating, etc. in order to increase the frictional resistance between them and the webbing 24 in case of a vehicle emergency.

The arm 42 provided with these locking means and rollers has a tension coil spring 80 between it and the leg plate 20.
The leg plate 1 is biased to one side by the presence of the
The roller 58 comes into contact with the stopper pin 82 that is stretched between the rollers 8 and 20 and stops, but if the tension of the webbing increases beyond a predetermined value, the roller 58 receives the tension of the webbing and resists the biasing force of the tension coil spring 80. The webbing is rotated counterclockwise in FIG. 1 to enable the first and second locking means to clamp the intermediate portion of the webbing.

To explain the operation of this embodiment configured in this way, when the occupant pulls the webbing 24 toward the occupant restraint portion 26, the webbing wound around the winding shaft 22 is unwound one after another, so that the tongue plate (not shown) and A webbing device is possible using a buckle device.

When the vehicle is in normal running condition, the winding shaft 2
2. Since the first roller 50 and the second roller 58 rotate smoothly, the webbing can be wound freely, and the passenger can arbitrarily change the driving posture.

When the vehicle is in an emergency situation such as a collision, the pendulum 34 detects the acceleration of the vehicle and swings, and the pawl 32 is pushed up and engaged with the ratchet wheel 30. As a result, the webbing unwinding rotation of the take-up shaft 22 is stopped instantaneously. On the other hand, the occupant is thrown in the direction of the collision due to inertia, so the webbing 2 that the occupant is wearing
4, a large tension is generated to move the winding shaft 22 toward the occupant restraint section 26.

This tension is applied to the arm 42 via the second roller 58.
The rotation of the arm 42 acts as a force to rotate the lock bar 7 in the counterclockwise direction in FIG.
6 and 62 approach lock bars 72 and 66 to sandwich the middle portion of the webbing between them. This tension also acts on the bushes 44, 56 and deforms them in the radial direction, causing the rollers 50,
58 contacts the inner circumferential surfaces of the holders 46 and 54, and a rotational resistance force is generated on the rollers 50 and 58 due to friction.

As a result, the large tension generated in the occupant restraint section 26 is attenuated by the second roller 58 and then reaches the portion held between the lock levers 72 and 76, and furthermore, due to the holding between these lock bars, the first roller 50 is
is further reduced by the rotational frictional resistance of the lock bars 62 and 66. Since the webbing tension is sequentially reduced in this way, the change in the webbing tension at the lock bars 62, 66, which are the first locking means, is small, and the webbing between the lock bars 62, 66 will not be damaged. Further, since the tension of the webbing between the lock bars 62 and 66 has already been reduced, the force required to pull out the webbing 24 from between the lock bars 62 and 66 and move it in the direction of the first roller 50 is small, and the webbing is reliably attached to the lock bars 62 and 66. sandwiched between.

Since the middle part of the webbing is reliably stopped from moving in this way, the lock bars 62 and 66 and the winding shaft 22
No large tension is applied to the webbing 24 between the two. Therefore, the webbing during this period will not be unwound from the take-up shaft 22 due to tightening.
The occupant is tightly restrained by the webbing 24, ensuring safety.

FIG. 6 shows a second embodiment of the resistance applying means for applying a rotational resistance force to the roller in the event of a vehicle emergency. In this embodiment, a bush 86 and a An elastic body 88 is interposed.

Therefore, in this embodiment as well, when the roller is subjected to a large force in the radial direction, the elastic body 88 is deformed, and the outer circumference of the roller contacts the inner circumference of the holder 46 to receive a frictional resistance force. .

In addition to these embodiments, various modifications can be considered for the resistance applying means that applies rotational resistance to the roller in the event of a vehicle emergency.

[Effect of the invention]

As explained above, in the webbing device according to the present invention, the intermediate portion of the webbing is wound around a roller and guided, and this roller provides rotational resistance in the event of a vehicle emergency, and the intermediate portion of the webbing is directly clamped by a plurality of locking means, so that the intermediate portion of the webbing is guided. This has the excellent effect of improving occupant restraint performance by reliably locking the vehicle without damaging the vehicle.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the webbing lock device according to the present invention, FIG. 2 is a side view of FIG. 1,
3 is a cross-sectional view taken along the line of FIG. 1, FIG. 4 is an exploded perspective view showing the arm and related parts, FIG. 5 is an operation diagram of FIG. 1, and FIG. 6 is another embodiment showing the resistance applying means. FIG. 3 is an example cross-sectional view. 10... Webbing winding device, 12... Frame, 22... Winding shaft, 24... Webbing, 26
... Occupant restraint part, 42 ... Arm, 44 ... Button with collar, 46 ... Holder, 50 ... First roller, 62, 66, 72, 76 ... Lock bar, 8
8...Elastic body.

Claims (1)

[Scope of utility model registration request] a frame, a take-up shaft that is pivotally supported on the frame and winds up an end of the webbing for occupant restraint, and a rotatable shaft that is pivotally supported on the frame and around which the middle part of the webbing unwound from the take-up shaft is wound. 1 roller, and the first roller when the tension of the webbing increases.
a resistance imparting means for imparting rotational resistance to the roller; an arm that is pivotally supported on the frame with a common axis with the first roller and whose free end rotates when the tension of the webbing increases; A first movable lock member provided on the winding shaft side is connected to a first movable lock member supported on the frame when the arm is rotated.
a first locking means that approaches the fixed locking member of the webbing and clamps the webbing between the take-up shaft and the first roller; a second roller rotatably supported on the free end side of the arm; A second movable locking member provided between the first roller and the second roller of the arm approaches a second fixed locking member supported by the frame when the arm rotates, and engages the roller and the occupant restraint part. A webbing lock device comprising a second locking means for clamping the webbing between the webbing.