JPH0351248Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a flexible member winding device that winds up and stores a flexible member after use.

BACKGROUND ART A flexible member winding device for winding up and storing a flexible member such as the webbing of a seat belt attached to an automobile or a blind made of a flexible sheet when the flexible member is not in use is conventionally well known. A conventional device of this type has a rotating shaft around which a flexible member is wound, and a spring that imparts a rotational habit to the rotating shaft in a direction in which the flexible member is wound around the rotating shaft. When stored, the flexible member is wound around the rotating shaft by the action of a spring, and when used, the flexible member is pulled out against the spring force.

However, in conventional winding devices, a spring force acts on the pulled-out flexible member and the member is constantly pulled in the direction in which it is rolled up, so handling the flexible member is often inconvenient. Furthermore, if a tensile force is constantly acting on the webbing of the seatbelt, the webbing compresses the chest of the occupant wearing the seatbelt, causing discomfort to the occupant and potentially preventing the occupant from wearing the seatbelt. If the spring force acting on the webbing is reduced in order to eliminate this drawback, there is a risk that the winding force will be insufficient when winding the webbing. Therefore, a take-up device, also called a tension reducer, is equipped with a first spring that applies a small spring force to the webbing when the seat belt is in use, and a second spring that applies a large spring force to the webbing when the webbing is taken up. is known, but this device inevitably has the disadvantage of a complicated structure and high cost.

Purpose An object of the present invention is to provide a flexible member winding device that eliminates the above-mentioned conventional drawbacks.

Configuration In order to achieve the above object, the present invention has a rotary shaft that is rotatably supported on a support body and around which a flexible member is wound, and a rotary shaft in which the flexible member is wound around the rotary shaft. When rotation is in the forward direction and rotation in the opposite direction is in the reverse direction, a spring that gives the rotational shaft a rotational habit in the forward direction; a ratchet wheel fixed to the rotational shaft; and a ratchet wheel facing the teeth of the wheel. The latchet wheel is located at the same position and is rotatably supported on the support body about the rotation axis, and the teeth of the latchet wheel are provided to prevent the ratchet wheel from rotating in the forward direction due to the action of the spring. a pawl that engages and allows rotation of the ratchet wheel in the reverse direction; and a pawl that is pivotally connected to a portion of the pawl other than the rotational axis of the pawl, and that rotates the ratchet wheel slightly in reverse to rotate the teeth and the pawl. After disengaging the
When the ratchet wheel rotates forward due to the action of the spring, it is pressed by the teeth of the ratchet wheel and rotates the pawl about its rotation axis out of the rotation trajectory of the teeth of the ratchet wheel. A flexible member winding device comprising a pole regulating member is proposed.

Effect According to the above configuration, when the flexible member is used, the pole engages with the teeth of the ratchet wheel, and the rotation of the rotating shaft due to the spring force can be prevented, so that the flexible member receives the retracting force due to the spring. Therefore, handling of the flexible member becomes easy, and when this retracting device is used for a seat belt, it is possible to eliminate the drawback that the webbing strongly presses against the chest of the occupant. Furthermore, when the flexible member is stored, the pawl is pushed out of the rotation locus of the tooth tip of the ratchet by the pawl regulating member, so the action of the pawl to prevent rotation of the ratchet wheel is released, and the flexible member is moved by the action of the spring. It will definitely get caught up in the rotating shaft.

Embodiment Hereinafter, an embodiment in which the present invention is configured as a seatbelt retractor, that is, a seatbelt retractor installed in an automobile, will be described with reference to the drawings.

In FIG. 1, a rotating shaft 2 is rotatably supported on a support bracket 1 fixed to the body of an automobile (not shown), and a webbing (not shown) has one end fixed to the shaft 2. ) is wound in a manner known per se. In this way, the flexible member is configured as a webbing in this example.

On the outside of the bracket 1, there is an end 2a of the rotating shaft 2.
A housing 5 is fixed thereto, and a ratchet wheel 3 is attached to the rotary shaft end 2a.
is integrally fixed. Further, a spring consisting of a mainspring spring 4 is arranged on the outside of the ratchet wheel 3, and one end 4a of this spring 4 is connected to the housing 5.
The other end 4b is locked to the boss portion 3a of the ratchet wheel 3. As a result, the rotating shaft 2 is given the habit of rotating in the direction in which the webbing is wound around the shaft 2 (in the direction of arrow A). Hereinafter, as needed, rotation in this direction will be referred to as "forward rotation" and rotation in the opposite direction will be referred to as "reverse rotation." The spring 4 gives the rotary shaft 2 a normal rotational habit.

A pawl 8 is rotatably supported on a pin 6 protruding from the housing 5, as shown in FIGS. Pole regulating member 10 by 9
is pivoted. The pawl 8 and the regulating member 10 are connected to the ratchet wheel 3 as shown in FIGS. 2 to 7.
located opposite the teeth of Further, a weight 11 is fixed to the pole regulating member 10, and this weight 11 applies a force to the regulating member 10 so that it tends to occupy the neutral position shown in FIG.

As can be seen from the above, in this example, the bracket 1 and the housing 5 constitute a support, the rotating shaft 2 is rotatably supported with respect to this support, and the pole 8 is also supported with respect to this support. pin 6
It is rotatably supported around a rotational axis that is the central axis of. Furthermore, the pole regulating member 10
is pivotally attached to a portion of the pawl 8 other than the above rotation axis.

The above-mentioned elements 3, 4, 8, 10, and 11 are housed inside the housing 5 and a cover 12 that is detachably fixed to the housing 5. The other configuration of the illustrated seat belt retractor is the same as the conventional one, and a description of the conventional configuration will be omitted.

When the webbing is pulled to use the seat belt, the rotating shaft 2 rotates in the reverse direction indicated by arrow B against the action of the spring 4. Along with this, the ratchet wheel 3 also rotates in the direction of arrow B, but at this time, as shown in FIG.
Although it comes into contact with the teeth of ratchet wheel 3,
Since these rotate around the pins 6, 9, the ratchet wheel 3 rotates without being hindered by these. In this way, the pawl 8 allows the ratchet wheel 3 to rotate in the reverse direction.

When the pawl 8a of the pawl 8 engages with one of the teeth of the ratchet wheel 3, for example the tooth designated by reference numeral 3b in FIG.
However, the claw portion 8a of the pawl 8 stops the movement of the tooth 3b, and the rotation of the wheel 3 is prevented.
In this way, the pawl 8 engages with the teeth of the ratchet wheel 3 to prevent the ratchet wheel 3 from rotating in the normal direction due to the action of the spring 4.
Due to this action, the rotating shaft 2 is also stopped, and the pulling force of the spring 4 is not applied to the webbing, and the webbing is locked in this state. Therefore, the occupant can wear the webbing in a desired state, for example, with the webbing slightly away from his or her chest.
This prevents pressure from being applied to the chest, allowing the user to comfortably wear a seatbelt and ensure their own safety.

To further pull out the webbing once it is locked, just pull the webbing. In this way, as shown in FIG.
The rotating shaft 2 and the ratchet wheel 3 further rotate in the reverse direction shown by arrow B while being removed from the claw portion 8a of the webbing, and the webbing can be pulled out.
Next, the other tooth is engaged with the claw portion 8a of the pawl 8,
When the tension on the webbing is released, the webbing is locked again (Figure 3).

To wind up the locked webbing onto the rotating shaft 2, pull the webbing a little in the locked state.
The ratchet wheel 3 in the state shown in FIG. 3 is slightly reversed in the direction of arrow B, and as shown in FIG. All you have to do is to disengage the teeth from the pawl 8 and release your hand from the webbing.
As a result, the ratchet wheel 3 begins to rotate normally in the direction of arrow A (FIG. 6), but at this time, the tip 10a of the pole regulating member 10 is caused by the weight of the weight 11 to rotate against the two pawls of the ratchet wheel 3. The tip 10a enters inside the tooth tip rotation locus T of the ratchet 3 (towards the center of rotation). Therefore, the back surface 10b of this tip portion 10a is pressed by the teeth 3b of the ratchet wheel 3, which has begun to rotate in the normal direction, as shown in FIG. As a result, the pawl 8 supporting the pawl regulating member 10 rotates around the pin 6 in the clockwise direction (direction of arrow C) in FIG. It is lifted to a position where it is not engaged. In this way, the pawl 8 is rotated by the pawl regulating member 10 outside the tooth tip rotation locus T of the ratchet wheel 3, so the ratchet wheel 3 is not obstructed by the pawl 8 in any way and is rotated by the action of the spring 4. It rotates in the normal rotation direction shown by arrow A, and the webbing can be wound around the rotating shaft 2.

As the ratchet wheel 3 rotates forward, the pawl regulating member 10 is pushed up further counterclockwise than the state shown in FIG. 6, and after reaching the state shown in FIG. 7, the pushing up action from the teeth 3b is released. , the pawl 8 rotates clockwise again, but is pushed counterclockwise again by the next tooth 3c. Normal rotation is not prevented.

As described above, the pawl regulating member 10 rotates forward when the ratchet wheel 3 rotates forward under the action of the spring 4 after the ratchet wheel 3 is slightly reversed to disengage its teeth from the pawl 8. , is pressed by the teeth of the ratchet wheel 3, and the pawl 8
The ratchet wheel 3 is rotated about its rotation axis outside the tooth tip rotation locus of the ratchet wheel 3.

To stop the webbing midway through the winding motion, place your hand on the webbing and pull it slightly, so that one of the teeth of the ratchet wheel 3 engages with the pawl 8a of the pawl 8 (Fig. 3), and the webbing is pulled out. can be locked.

As mentioned above, when storing the webbing, the webbing can be rolled up in the same way as before, and when it is used, the winding force of the spring does not act on the webbing, which improves the comfort when wearing the seatbelt and makes it easier to wear the belt. It becomes possible to promote this.

The winding device according to the present invention can be widely applied to devices for winding up blinds, etc. In this case as well, since no pulling force is applied to the flexible member when it is used, it is easy to handle it.

Effects According to the present invention, the flexible member can be locked in any position, and therefore spring force can be prevented from acting on the flexible member when the flexible member is used, improving the practicality of the winding device. can be done. Moreover, the flexible member can be wound onto the rotating shaft simply by slightly reversing the ratchet wheel to disengage its teeth from the pawl. Such an effect can be achieved with an extremely simple configuration.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a specific example in which the present invention is applied to an automobile seat belt retractor;
FIGS. 2 to 7 are explanatory diagrams each illustrating the operation of the apparatus shown in FIG. 1. 2...Rotating shaft, 3...Ratchet wheel, 3
b, 3c...teeth, 4...spring, 8...pole, 1
0...Pole regulating member, T...Tooth tip rotation locus.

Claims (1)

[Claims for Utility Model Registration] A rotating shaft that is rotatably supported on a support body and around which a flexible member is wound; When the rotation in the opposite direction is referred to as reverse rotation, a spring that gives the rotary shaft a normal rotational habit; a ratchet wheel fixed to the rotary shaft; and a ratchet wheel located opposite to the teeth of the wheel; is rotatably supported on the support body about a rotational axis, and engages with the teeth of the ratchet wheel to prevent the ratchet wheel from rotating in the forward direction due to the action of the spring; A pawl that allows rotation of a ratchet wheel in the reverse direction, and a pawl that is pivotally connected to a portion of the pawl other than the rotational axis of the pawl, and the ratchet wheel is slightly reversed to release the engagement between its teeth and the pawl. After letting
When the ratchet wheel rotates forward due to the action of the spring, it is pressed by the teeth of the ratchet wheel and rotates the pawl about its rotation axis out of the rotation trajectory of the teeth of the ratchet wheel. A flexible member winding device comprising a pole regulating member.