JPH0339330Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a retractor for a seat belt, and an object of the present invention is to provide a retractor that can be used comfortably by alleviating the feeling of pressure exerted on the wearer's body when worn. This is the purpose.

The present invention will be explained with reference to the drawings. Reference numeral 1 denotes the main body of the retractor, which is composed of a bottom plate 2 and a pair of side plates 3 provided oppositely on both side edges of the bottom plate 2. A shaft 4 is rotatably supported on the side plate 3 via a bush 5, and a webbing 6 is wound around the shaft 4. One end of the shaft 4 protrudes from the side plate 3 to form a protrusion 7, and the base of the protrusion 7 is provided with external teeth 8. 9 is attached to the protrusion 7 of the shaft 4.
It is a disc-shaped rotating member that is rotatably supported by a shaft, and a sleeve 10 is protruded from the center thereof, and a spiral spring 12 as a spring means is provided between the sleeve 10 and the casing 11. The spiral spring 12 always applies a rotational force to the rotating member 9 in the webbing winding direction. Further, a pin 13 is provided protruding from the side surface of the rotating member 9.

Reference numeral 14 denotes an external gear fixed to the protrusion of the shaft 4 so as to rotate together with the shaft 4, and has external teeth 15 carved on its outer periphery.

Reference numeral 16 denotes a rotary plate rotatably supported by a protruding portion of the shaft 4, and an internal gear 18 having internal teeth 17 carved on the inside is laterally attached to the outer peripheral portion of the rotary plate. It is installed protrudingly. Furthermore, ratchet teeth 19 are formed on the outer periphery of the rotating plate 16. Also, on the side of the rotating plate 16, there is a pin 2.
0 is provided protrudingly.

Reference numeral 21 denotes a planetary gear, which is rotatably supported by the pin 13 of the rotating member 9, and is supported by the external teeth 15 of the external gear 14 and the internal teeth 17 of the rotating plate 16.
It meshes with the

A rotating body 22 is rotatably supported on the side surface of the rotary plate 16, and has internal teeth 23 carved on its inner periphery. Further, a stopper 24 is provided protruding from the outer periphery of the rotary body 22, and the stopper 24 collides with a stopper 25 protruding from the side surface of the rotary plate 16, thereby limiting the range of rotation of the rotary body 22 with respect to the rotary plate 16. has been done.

Reference numeral 26 denotes a planetary gear, which is composed of a large-diameter gear 27 and a small-diameter gear 28 to form a two-stage gear, and is rotatably supported by the pin 20 of the rotating plate 16. The large diameter gear 27 meshes with external teeth 8 formed on the protrusion 7 of the shaft 4, and the small diameter gear 28 meshes with internal teeth 23 of the rotating body.

Reference numeral 29 denotes an actuator that is rotatably supported with respect to the main body 1, and a ratchet 30 that can engage with the ratchet teeth 19 of the rotary plate 16 is rotatably attached to the tip of the actuator. ing. The actuator 29 is biased by the spring 31 in a direction in which the ratchet 30 is separated from the ratchet teeth 19.
The ratchet 30 is also biased by a spring 32 into engagement with the ratchet teeth 19. Further, a suction plate 34 is provided on the tail portion 33 of the actuator 29, and the suction plate 34 is opposed to an electromagnet 35 that is operated from the outside. The switch for the electromagnet 35 is normally incorporated into a seat belt buckle (not shown), and is adapted to energize the electromagnet 35 when the buckle is engaged.

Next, the operation of the retractor of the present invention will be explained.
First, FIG. 4 shows a state in which the webbing 6 is fully wound around the shaft 4 when the retractor is not in use. In this state, the electromagnet 35 is not energized, the actuator 29 is rotated counterclockwise by the elasticity of the spring 31, and the ratchet 30 is separated from the ratchet teeth 19 of the rotating plate 16. In this state, due to the elasticity of the spiral spring 12, the rotation plate 16
and the stopper 24 of the rotating body 22.
are in a state of collision as shown in Figure 4b,
Therefore, the shaft 4, the external gear 14, the rotating member 9, the rotating plate 16, and the rotating body 22 do not rotate relative to each other, and the spiral spring 12
The elasticity is directly transmitted to the shaft 4 via the rotating member 9, the planetary gear 21, and the external gear 14.

Next, when the webbing 6 is pulled out to fasten the seat belt, the shaft 4 is rotated clockwise. At this time, as described above, since the rotating member 9, rotating plate 16, and rotating body 22 do not rotate relative to each other, all of these members rotate together with the rotation of the shaft 4. .
Therefore, the spiral spring 12 interposed between the rotating member 9 and the casing 11 is wound tightly. This state is shown in FIG.

When the buckle is then engaged, a switch built into the buckle is turned on, energizing the electromagnet 35. Note that this switch is not limited to one built into the buckle, and may be opened and closed by other means. For example, it can also be operated manually.

When the electromagnet 35 is energized, the actuator 29
The suction plate 34 is attracted to the electromagnet 35, the actuator 29 rotates clockwise against the elasticity of the spring 31, and the ratchet 30 engages with the ratchet teeth 19 of the rotary plate 16. In this state, when the extra webbing 6 that has been pulled out is wound into the retractor, the shaft 4 rotates counterclockwise, but the rotary plate 16 cannot rotate because it is prevented from rotating by the ratchet 30. Therefore, the rotating plate 16
stops, only the shaft 4 and the external gear 14 rotate counterclockwise, and the planetary gears rotate counterclockwise behind the external gear 14 while rotating clockwise. Therefore, the rotational speed of the rotating member 9 is slower than that of the shaft 4, the webbing winding force applied by the spiral spring 12 to the shaft 4 is reduced, and the feeling of pressure on the wearer's body is alleviated.

On the other hand, by stopping the rotation of the rotating plate 16, the revolution of the planetary gear 26 is stopped. Here, since the shaft 4 rotates counterclockwise, the planetary gear 26 rotates clockwise, and the rotating body 2
Rotate 2 clockwise. At this time, the rotating body 22
The rotation speed of the shaft 4 is determined by the rotation speed of the planetary gear 26.
Moreover, since the planetary gear 26 is a two-stage gear, the rotational speed of the shaft 4 is significantly reduced. Therefore, until the stopper 24 collides with the stopper 25 from the opposite direction, the shaft 4 can rotate many times, and the range in which the feeling of pressure can be alleviated is extremely large, and the wearer can wear the seat belt while still wearing the seat belt. This allows you to move your body widely and freely, and moving your body does not impair the function of relieving pressure. The above state is shown in FIG. In addition,
In the present invention, the planetary gear 26 does not necessarily have to be a two-stage gear, but as in the embodiment, it is used as a two-stage gear to reduce the rotation of the shaft 4 and reduce the rotation of the rotating body 2.
2, the number of rotations of the rotating body 22 becomes significantly lower than that of the shaft 4, and the range in which the pressure sensation alleviation function can be performed becomes wider.

Subsequently, when the seat belt is finished being worn and the buckle is disengaged, the switch is turned off and the energization of the electromagnet is stopped. Then, the actuator 29 is rotated counterclockwise by the elasticity of the spring 31, and the ratchet 30 is disengaged from the ratchet teeth 19. As a result, when the rotating body 16 becomes able to rotate freely, the rotating member 9 rotates counterclockwise due to the elasticity of the spiral spring 12, thereby causing the planetary gear 21 to rotate counterclockwise while the external gear 1
4 in a counterclockwise direction, and the rotating plate 16 is further sped up and rotated counterclockwise. Further rotation of the rotating body 16 causes the planetary gear 26 to revolve counterclockwise around the protrusion 7 of the shaft 4 while rotating in the counterclockwise direction, whereby the rotating body 22 is further accelerated and rotates counterclockwise. Rotate to . Since the rotational speed of the rotating body 22 at this time is greater than the rotational speed of the rotating plate 16, the stopper 24 catches up with the stopper 25 and collides with it. As a result, the state shown in FIG. 5 is restored again, and the external gear 14, rotating member 9, rotating plate 16, and rotating body 22 no longer rotate relative to each other, and the elasticity of the spiral spring 12 remains unchanged. The force is transmitted to the shaft 4, and by rotating the shaft 4 with a large force, the webbing 6 can be wound up.

When retracting the webbing 6, the retractor of the present invention can fully utilize the elasticity of the spring means to retract it with a large force, and when worn, it reduces the retracting force applied to the webbing 6, thereby reducing the wearer's discomfort. It is extremely excellent because it can be used comfortably by relieving the feeling of pressure on the body, and it also has a wide range of relieving pressure, allowing the wearer to move freely. be.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a central vertical cross-sectional view of the main part, and FIGS. 2 and 3 are cross-sectional views of FIG. 1. FIGS. 4 to 6 show the operating state, and in each figure, a indicates a - cross section, and b indicates a - cross section. 1... Retractor body, 4... Shaft, 6
... webbing, 8 ... external teeth, 9 ... rotating member,
12... Spring means (swirl spring), 14... External gear, 16... Rotating plate, 18... Internal gear, 1
9...Ratchet tooth, 21...Planetary gear, 22...
... Rotating body, 23 ... Internal teeth, 26 ... Planetary gear, 3
0...Rachet.

Claims (1)

[Scope of utility model registration request] A shaft 4 that is rotatably supported by the retractor body 1 and has a webbing 6 wound around its outer periphery, and a shaft 4 that is rotatably supported on the shaft 4 and that applies a rotational force in the webbing 6 winding direction by a spring means 12. A rotary member 9 provided, an external gear 14 provided to rotate integrally with the shaft 4, and an internal gear 18 that is rotatably supported on the shaft 4 and protrudes from one side thereof. At the same time, a rotating plate 16 having ratchet teeth 19 formed on its outer periphery, a planetary gear 21 rotatably supported on one side of the rotating member 9 and meshed with the external gear 14 and the internal gear 18, and the rotating A rotating body 22 that is coaxially rotatably supported with respect to the plate 16, has a limited rotation range with respect to the rotating plate 16, and has internal teeth 23 carved on its inner periphery, and a rotating body 22 that is rotatable on one side of the rotating plate 16. A planetary gear 26 is pivotally supported by the rotating body 22 and meshes with the internal teeth 23 of the rotating body 22 and the external teeth 8 provided integrally with the shaft 4, and the rotating plate 1 is operated from the outside.
The rotary member 9, the planetary gear 21, the rotary plate 16 and The rotating body 22 is fully rotated in the webbing 6 winding direction with respect to the rotating plate 16 via the planetary gear 26, and the rotating member 9, the rotating plate 16, the rotating body 22, and the shaft 4 rotate as one. The rotational force of the spring means 12 is directly transmitted to the shaft 4, and since the rotating plate 16 does not rotate when the ratchet 30 is engaged with the ratchet teeth 19, the rotation of the rotating member 9 is caused by the rotation of the planetary gear 21. A seat belt retractor characterized in that the speed is increased and transmitted to the shaft 4 via an external gear 14, and the rotational force of the spring means 12 is decreased and transmitted to the shaft 4.