JPH0131568Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a retractor for a seatbelt, and relates to a retractor that can be used comfortably by relieving the feeling of pressure on the user's body when worn. The purpose of the present invention is to provide a structure that is simple in structure, reliable in operation, and in which the operating position of a pressure relief mechanism does not easily shift even if the wearer moves his or her body while wearing a seatbelt. It is.

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 opposite to each other on both sides of the bottom plate 2. Side plate 3
A shaft 4 is rotatably supported 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, and a slot 7 is formed at its tip. A rotary plate 8 is rotatably supported by the shaft 4, and has ratchet teeth 9 formed on its outer periphery. Further, a ring-shaped protrusion 10 is provided on the side surface of the rotating plate 8 facing the side plate 3, and a friction plate 11 is fitted on the outer periphery of the protrusion 10. The friction plate 11 is ring-shaped and has an outer diameter that is approximately the same as the outer diameter of the ratchet teeth 9 of the rotating plate 8. Large cam protrusion 12
A cam recess 13 having a diameter slightly smaller than the diameter of the bottom of the ratchet tooth 9 is formed in the center thereof, and a stopper piece 14 is provided protruding from a part of the outer periphery. The friction plate 11 is fitted loosely into the protruding strip 10, and rotates together with the rotary plate 8 due to the frictional force of a friction spring 15.

A protrusion 16 is provided on the opposite surface of the rotating plate 8, and a two-stage gear 19 in which a large diameter gear 17 and a small diameter gear 18 are fixed coaxially and integrally is rotatably supported on the protrusion 16. There is. A driving gear 20 is integrally fixed to the shaft 4, and is fixed to the shaft 4 using the slot 7 of the shaft 4. The drive gear 20 meshes with the large diameter gear 17.

A barrel 21 is rotatably supported on the shaft 4, and a spiral spring 22 is provided between the barrel 21 and the shaft 4 to apply a rotational force to the shaft 4 in the belt winding direction. There is. Further, a driven gear 23 having a slightly larger diameter than the drive gear 20 is integrally fixed to the side surface of the barrel 21, and the driven gear 23 meshes with the small diameter gear 18.
A cam 25 having a cam convex portion 12 is protruded from the side surface of the barrel 21, and one edge of the cam 25 forms a stopper edge 26.

Reference numeral 27 denotes a ratchet rotatably supported by the side plate 3, and a pawl 28 that engages with the ratchet teeth 9.
, and is constantly biased by a wire spring 29 in the direction of engagement with the ratchet teeth 9.

Reference numeral 30 denotes a casing, and stoppers 31 and 32 that come into contact with the stopper pieces 14 of the friction plate 11 are provided on the inner periphery of the casing. Reference numeral 33 denotes a stopper that comes into contact with the stopper edge 26 of the barrel 21, and is fixed to the side plate 3.

Next, the operation of this retractor will be explained. Third
The figure is a schematic diagram showing the operation, and FIG. 3a shows a state in which the webbing 6 is wound around the retractor. In this state, the friction plate 11 is rotated clockwise, and the stopper piece 14 is in contact with the stopper 32. The pawl 28 of the ratchet 27 rests on the cam convex portion 12b and does not engage with the ratchet teeth 9 of the rotating plate 8. Further, the barrel 21 rotates clockwise, and the cam 25
The stopper edge 26 is in contact with the stopper 33.

If you pull out the webbing 6 here, the shaft 4
rotates clockwise. Since the clockwise rotation of the barrel 21 is stopped by the stopper 33, the two-stage gear 19 rotates counterclockwise around the driven gear 23 while rotating on its own axis.
rotates counterclockwise, and along with this, the friction plate 11
also rotate in the same direction. As a result, the pawl 28 of the ratchet 27 once sinks into the cam recess 13 of the friction plate 11, but since the direction of rotation of the rotating plate 8 is opposite to the direction of engagement of the ratchet teeth 9, the pawl 28 is immediately pushed up. It rides on the cam convex portion 12a. Then, as shown in FIG. 3b, the stopper piece 14 is connected to the stopper 31.
The rotation of the friction plate 11 is stopped. Thereafter, the rotary plate 8 continues to rotate.

Next, the webbing 6 is pulled out to the required length and worn, and when the excess webbing 6 is rolled into the retractor, the shaft 4 first rotates counterclockwise,
The two-stage gear 19 revolves around the driven gear 23 in a clockwise direction in the opposite direction to that described above while rotating. As a result, the rotary plate 8 and the friction plate 11 rotate clockwise, and the pawl 28 of the ratchet 27 moves against the friction plate 11.
cam recess 13 and engages with the ratchet teeth 9 as shown in FIG. 3c. As a result, the rotation of the rotating plate 8 is stopped.

Webbing 6 is further entangled, and shaft 4
When the rotation plate 8 rotates further, the two-stage gear 19 cannot revolve and only rotates on its own axis because the rotating plate 8 cannot rotate clockwise. As a result, driven gear 2
3 rotates counterclockwise, and the barrel 21 also rotates in the same direction. This situation is shown in Figure 3d. Therefore, the relative rotational speed of the shaft 4 with respect to the barrel 21 decreases, and the winding force applied to the shaft 4 by the spiral spring 22 decreases. Therefore, the winding force applied to the webbing is reduced, and the feeling of pressure on the user's body is reduced, so that the user can use the webbing comfortably without feeling pressured on his or her body.

Next, when the user releases the wearer and retracts the webbing 6 into the retractor, the shaft 4 and barrel 21 further rotate counterclockwise from the state shown in FIG. 3d. Then, the pawl 28 is pushed up by the cam convex portion 24, and the engagement between the pawl 28 and the ratchet teeth 9 is released. Then, the barrel 21 rapidly rotates clockwise due to the spring force of the spiral spring 22, the two-stage gear 21 revolves around the drive gear 20 while rotating, and the rotating plate 8 and friction plate 11 rotate clockwise. Then, the pawl 28 rides on the cam protrusion 12b, the stopper piece 14 comes into contact with the stopper 32, and the rotation of the friction plate 11 is stopped.The rotating plate 8 and the barrel 21 continue to rotate, and the stopper edge 26 of the cam 25 is stopped. When they come into contact with the stopper 33, their rotation is stopped and they return to the state shown in FIG. 3a. After that, the entire retracting force of the spiral spring 22 acts on the shaft 4, and the shaft is rotated with a large force so that the webbing 6 can be retracted.

In the present invention, when the seat belt is worn, the winding force applied to the webbing 6 is reduced, and the tension of the webbing is reduced, so that the user does not feel excessive pressure on his or her body.
Can be used comfortably. On the other hand, webbing 6
When the webbing 6 is wound into the retractor, the winding force becomes large, and it becomes possible to wind the webbing 6 sufficiently and completely. Furthermore, according to the present invention, after the webbing 6 is pulled out and put on, and the excess webbing 6 is rolled up into the retractor, the webbing 6 can be worn not only when the webbing is normally worn, but also when the webbing 6 is pulled out by moving the body. However, the tension applied to the webbing 6 is small, preventing a feeling of pressure.

In addition, in the present invention, the pawl 28 is operated by the barrel 21 which rotates at a reduced speed from the rotation of the shaft 4, so the winding force applied to the webbing 6 can be reduced over a wide range, and even if the user moves his/her body greatly. There is no possibility that the winding force will increase inadvertently.

Furthermore, in the present invention, when the ratchet 27 is engaged with the ratchet teeth 9 of the rotating plate 8, the rotation of the shaft 4 is transmitted via the two-stage gear 19 to the driven gear 23 formed in the center of the barrel 21. Therefore, the barrel 21 is driven at a position close to the central axis, and rotation is stable.

[Brief explanation of the drawing]

FIG. 1 is a central vertical cross-sectional view of the main parts of the retractor of the present invention, and FIG. 2 is a cross-sectional view taken from FIG. 1. FIG. 3 is a schematic diagram showing the operation of the present invention. 1...Main body, 3...Side plate, 4...Shaft, 8
... Rotating plate, 9 ... Ratchet tooth, 11 ... Friction plate, 13 ... Cam recess, 19 ... Two-stage gear, 20
... Drive gear, 23 ... Driven gear, 21 ... Barrel, 22 ... Spring means, 25 ... Cam, 27 ...
Ratchet.

Claims (1)

[Scope of utility model registration request] A shaft 4 rotatably supported by a pair of opposing side plates 3 of the main body 1; a drive gear 20 fixed to the shaft 4; A barrel 21 has a limited rotation range and has a driven gear 23 and a cam 25 having a diameter slightly larger than that of the drive gear 20 protruding from the side surface, and a barrel 21 which is interposed between the barrel 21 and the shaft 4 and has a driven gear 23 and a cam 25 projecting from the side surface. a spring means 22 for applying a rotational force in the belt winding direction; a rotary plate 8 rotatably supported on the shaft 4 and having ratchet teeth 9 on the outer periphery; a friction plate 11 having a turtle recess 13 on its outer periphery, which rotates together with the rotary plate 8 due to frictional force and has a limited rotation range relative to the main body 1; A seat belt comprising a two-step gear 19 that meshes with a gear 20 and a driven gear 23, and a ratchet 27 that is rotatably supported on the main body 1 and always biased in a direction that engages the ratchet teeth 9. retractor.