JPH0514931Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention aims to improve the seatbelt retractor installed in vehicles such as automobiles, and in particular to improve the seatbelt retractor that is installed in vehicles such as automobiles. The present invention relates to a new seat belt retractor that does not unnecessarily put pressure on an occupant.

(Prior Art) A seat belt retractor installed in an automobile or the like includes a reel shaft of a reel that winds up a belt having a buckle at the end, a frame that supports the reel shaft, and a frame that supports the reel shaft. It has a spring that biases in the winding direction. The seatbelt (hereinafter referred to as belt) in this type of device is worn normally when the occupant is seated in the seat, pulls out the belt, attaches the buckle, and absorbs any excess slack. It is desirable to configure the structure so as not to apply unnecessary pressure.

In this case, the biasing force of the belt winding spring is used to generate winding pressure, so unless special measures are taken to the spring device, (a) the compressive force during normal wearing will be reduced. If a spring with a relatively weak biasing force is used to reduce the force, the winding pressure will be correspondingly weak.

(b) If a spring with a strong biasing force is used to maintain sufficient winding pressure, the compressive force during normal installation will increase.

This will give rise to a contradictory situation.

In order to solve this trade-off, conventional winding devices of this type have a special mechanism or device interposed between the belt and the spring device.

(Problem that the invention seeks to solve) However, the more complex the mechanism, the more difficult it is to manufacture it, and the more likely it is that it may lead to failures, so it is more likely that improvements will be made. It is requested.

This idea was made in view of this situation,
To provide a seat belt retractor that can maintain sufficient belt retracting force, does not apply unnecessary pressure to an occupant when the belt is in a normal wearing state, and has a simple mechanism. purpose.

[Structure of the invention] (Means for solving the problems) In order to achieve the above object, the seatbelt retractor of the invention includes a hook retainer that rotates together with the reel shaft, and a tensioner that has internal teeth and is fixed to the frame. The reel shaft includes a purl ring, an outer circumferential wall in which a partially cut notch is formed, and an inner projecting piece, and is slidable by friction in the rotational direction with respect to the stopper ring and rotatable with respect to the reel shaft. a hook actuator provided within a stopper ring; a hook actuator located within the hook actuator and rotatably held by the hook retainer; when a tip of the hook actuator protrudes from a notch of the hook actuator, the stopper The ring engages with the inner teeth of the ring, and when the rear end comes into contact with the inner protrusion of the hook actuator, it rotates and is maintained in a state of non-engagement with the inner teeth, and the tip touches the inner protrusion of the hook actuator. The hook is configured to include a hook that rotates to release the maintenance of the disengaged state when the hook comes into contact with the hook.

(Function) Since the present invention has the above configuration, it functions as follows.

First, the occupant gets into the vehicle and pulls out the belt of the required length, then engages the buckle at the end of the belt and releases the belt.The slack in the belt is caught by the force of the spring until it is fitted to the occupant. . At this time, the reel shaft and the hook retainer rotate in the direction of the belt winding, but the hook actuator is stopped by the frictional force with the stopper ring, so the tip of the hook may cause an internal collision of the hook actuator. This causes the hook to pivot and become ready for engagement with the internal teeth of the stopper ring.

Then, while maintaining this state, the hook actuator is pushed by the hook and rotates in the belt winding direction together with the reel shaft until the slack in the belt is completely taken up.

Next, when the belt is pulled out a little, the hook retainer rotates together with the reel shaft, so when the tip of the hook reaches the notch of the hook actuator and protrudes from the inner surface of the outer peripheral wall, the tip of the hook moves into the inner tooth of the stopper ring. By engaging with the reel shaft, rotation of the reel shaft in the belt winding direction by the spring is prevented, and the feeling of pressure on the occupant due to the belt tension is removed, resulting in a tension-less state.

To remove the belt, it is sufficient to pull out the belt and release the buckle, thereby releasing the tensionless state and winding the belt by the force of the spring.

As described above, according to the present invention, it is possible to maintain sufficient belt winding force by the spring, and when the belt is in the normal wearing state, it becomes tensionless and does not put unnecessary pressure on the occupant. Furthermore, since the mechanism is simple, manufacturing is easy, and the causes of failures are reduced.

(Example) The illustrated embodiment will be described below.

FIG. 1 is a partially omitted front view showing the main parts of the seat belt retractor according to the present invention, FIG. 2 is a longitudinal sectional view,
FIG. 6 is an exploded view.

In these figures, reference numeral 1 denotes a frame of a belt winding device having a U-shaped cross section, and a pair of side walls 1A, 1A' are provided with bearing portions 1b, 1b'.

Reference numeral 2 denotes a reel shaft, which is provided to pass through the shaft portions 1b, 1b' of the frame 1. A ratchet wheel 2a of an emergency locking device (not shown) having a structure known per se is fixed to one end of the reel shaft 2, and a hook retainer 4, which will be described later, is fitted to the other end so as to be integrally rotatable. A square shaft 2b is formed.

2A is a belt reel, and the frame 1
It is assembled to rotate integrally with the reel shaft 2 between the side walls 1A, 1A' of the reel shaft 2, and is provided with a structure 2B for holding the inner end of the belt B at its axial center.

3 is a retainer, which is fixed to the left side wall 1A of the frame 1 by appropriate means. This retainer 3 has a hook retainer 4 that engages with the square shaft 2b of the reel shaft at its circular opening.
The boss portion 4c is rotatably supported.

As described above, the hook retainer 4 has a boss 4c at the rear end that is fitted and fixed to the square shaft 2b of the reel shaft 2, and a boss 4d that holds the inner end of the belt winding spring 13 at the tip, which is attached to the flange 4a. is a protrusion 4 that supports a hook 8, which will be described later.
It is equipped with b.

5 is a hook actuator, which connects the hook retainer 4 via a stopper ring 7, which will be described later.
The outer peripheral wall 5b on the ring is fitted into the boss portion 4c of the ring.
and a hook 8 supported by the hook retainer 4.
It has an inner protrusion 5a that can be engaged with the stopper ring 7, and a notch 5d that is partially cut out in the outer peripheral wall 5b, and slides in the rotational direction with a constant frictional force against the stopper ring 7 by the clutch spring 6. Possibly connected.

The stopper ring 7 is fixed to the retainer 3 and includes internal teeth 7a. A boss 4c of the hook retainer 4 is rotatably fitted into the center of the stopper ring 7.

The hook 8 is rotatably supported by the protrusion 4b of the hook retainer 4, and is moved away from the position where the tip 8b meshes with the internal teeth 7a of the stopper ring 7 by the first and second hook springs 9, 10. It is designed to be rotated between positions. The first hook spring 9 is fixedly attached to the protrusion 4b of the hook retainer 4, and always urges the hook 8 in the direction in which the hook tip 8b meshes with the internal teeth 7a of the stopper ring 7. The hook spring 10 has its base end fixed to the hook retainer 4 with rivets or screws, and the hook 8 comes into contact with the inner projection 5a of the hook actuator 5 and moves in the direction of arrow A, as shown in FIG. When rotated, the tip 10a of the hook 8 engages with the notch 8a of the hook 8, and the tip 8b of the hook 8 maintains the hook 8 in a position where it does not mesh with the internal teeth 7a of the stopper ring 7.

As mentioned above, 13 is a belt winding spring whose inner end is held by the tip boss 4d of the hook retainer 4, and the housing part 1 of the cover 14 attached to the left side wall 1A of the frame 1.
4a, and constantly urges the reel shaft 2 in the belt winding direction (clockwise in FIG. 1) via the hook retainer 4.

Reference numeral 15 denotes a lid body of the belt winding spring 13 attached to the cover 14.

Next, let's talk about the operation of the above-mentioned device in the third section.
This will be explained with reference to FIGS.

(1) When wearing a seatbelt a First, before the seatbelt is fastened, the device is in the state shown in FIG. 5, as will be described later. In this state, when an occupant gets into a car or the like and pulls out the belt B to put on the belt, the reel shaft 2 and the hook retainer 4 integrated therewith resist the spring force of the belt winding spring 13. Rotates counterclockwise in the diagram.

This rotation causes the tip 8b of the hook 8 rotatably attached to the hook retainer 4 to
After passing through the notch portion 5d of the hook actuator 5, which has stopped rotating, the outer peripheral wall 5b
The hook 8 is accommodated inside the outer peripheral wall 5b in contact with the reel shaft 2 and the hook retainer 4, and the hook 8 also rotates counterclockwise together with the reel shaft 2 and the hook retainer 4. When the rear end 8c of the hook 8 comes into contact with the inner protruding piece 5a of the hook actuator 5, the third
As shown in the figure, the notch 8a is rotated in the direction of the arrow A, and the notch 8a is attached to the tip 10 of the second hook spring 10.
a, and while maintaining the state shown in FIG. 3, that is, the position where the tip 8b of the hook 8 does not mesh with the internal teeth 7a of the stopper ring 7, the rear end 8c of the hook engages with the internally during the subsequent belt withdrawal. The engagement with the piece 5a causes the hook actuator 5 to rotate counterclockwise against the frictional force with the stopper ring 7. Note that, since the hook actuator 5 is frictionally and slidably connected to the stopper ring 7 by a clutch spring 6, it is possible to rotate relative to the stopper ring 7;
The hook 8 does not rotate to the extent that the tip 8b contacts the outer peripheral wall 5b.

b After pulling out the belt of the required length, engage the buckle (not shown) at the end of the belt and release the belt. Get caught up in it. At this time, the reel shaft 2 and the hook retainer 4 rotate clockwise in the figure, but since the hook actuator 5 is stopped by the frictional force with the stopper ring 7, the hook 8 is rotated as shown in FIG. The tip 8b of the hook 8 comes into contact with the projection 5a of the hook actuator 5 from the opposite side to that shown in FIG. 3, whereby the hook 8 rotates in the direction of arrow B in FIG. The state will be as shown in the figure. That is, the rotation of the hook 8 forcibly disengages the distal end 10a of the second hook spring 10 from the notch 8a of the hook 8, and the distal end 8b of the hook 8 is forced into contact with the hook actuator 5 by the first hook spring 9. is biased in the outer circumferential direction of the stopper ring 7, and becomes capable of meshing with the inner teeth 7a of the stopper ring 7.
Then, while maintaining this state, the hook actuator 5 is pushed by the hook 8 and the reel shaft 2 is moved until the slack in the belt is completely taken up.
It will also rotate clockwise.

c Next, when the belt is slightly pulled out from the state shown in FIG.
When it reaches point d, the hook tip 8b touches the outer peripheral wall 5.
b, the hook 8 is rotated counterclockwise by the spring force of the first hook spring 9, and the hook tip 8b is brought into engagement with the internal teeth 7a of the stopper ring 7 (see Fig. 1). Even if the belt is released, the belt winding spring 13
This prevents the reel shaft 2 from rotating in the belt winding direction, thereby eliminating the feeling of pressure on the occupant due to the belt tension. That is, it becomes a tensionless state.

d Release of tensionless When the belt is pulled out from the state shown in FIG. 1 to the state shown in FIG. hook 8
Since the tip 8b of the stopper ring 7 is maintained in a position where it does not mesh with the internal teeth 7a of the stopper ring 7, the tensionless state is released.

However, in the range where the second hook spring 10 does not engage with the notch 8a of the hook 8, even if the belt is pulled out, when the belt is reeled in to the initial tension-less position (the position shown in Figure 1), the belt will be in a tension-less state. Therefore, even if the occupant moves slightly, the tension-less state will not be released. Further, even if the occupant moves within the above range, the outer circumferential wall 5b of the hook actuator 5 acts as a shielding plate, and the hook 8 and the inner teeth 7a of the stopper ring 7 do not engage with each other. So,
The tension-less position changes and does not give the occupant a feeling of pressure.

When the buckle is released from the tensionless release state (the state shown in FIG. 3), the state shown in FIG. 5 is reached as described above, and the belt is completely wound up by the spring force of the belt winding spring 13.

(2) When the seat belt is not in use As can be seen from the above explanation, when the seat belt is not in use, the belt is completely retracted, so the device is in the state shown in Figure 5. That is,
When the buckle is released in the tensionless non-operating position (the position shown in FIG. 3 or FIG. 5, ie, the tensionless released state), the belt will be in the state shown in FIG. 5 when stored.

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above-described embodiment and can be modified as appropriate within the scope of the gist of the present invention.

[Effects of the invention] As detailed above, according to the invention, sufficient belt winding force can be maintained by the spring, and when the belt is in the normal wearing state, the belt becomes tensionless, thereby causing no injury to the occupant. Since no necessary pressure is applied and the mechanism is simple, manufacturing is easy and the causes of failure are reduced.

Furthermore, in the range until the rear end of the hook comes into contact with the inner protrusion of the hook actuator, the tension-less state is not released even if the occupant moves, and the tension-less position changes, giving the occupant a feeling of pressure. There is no such thing as giving.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted front view showing the main parts of the seat belt retractor according to the present invention, Fig. 2 is a longitudinal sectional view of the same, Figs. 3 to 5 are explanatory views of the same, and Fig. 6 is an exploded view of the same. It is. 2... Reel shaft, 4... Hook retainer, 5... Hook actuator, 7... Stopper ring, 8... Hook, 13... Spring.

Claims (1)

[Scope of utility model registration request] A seat belt retractor for a vehicle, which includes a frame, a reel shaft of a reel that is rotatably supported by the frame and that reels in a belt, and a spring that constantly biases the reel shaft in the belt retracting direction. , a hook retainer that rotates together with the reel shaft, a stopper ring that has internal teeth and is fixed to the frame, and a stopper ring that faces the inner circumferential surface of the internal teeth that is formed with a partially cut out notch. a hook actuator that includes an extending outer circumferential wall and an inner projecting piece and is supported on the reel shaft via a stopper ring so as to be frictionally slidable in the reel shaft rotational direction with respect to the stopper ring; It is located in the yuator and rotatably held by the hook retainer, and when the tip protrudes from the notch of the hook actuator, it engages with the internal teeth of the stopper ring and rotates the reel shaft in the belt winding direction. When the rotation is prevented and the rear end comes into contact with the inner protrusion piece of the hook actuator, it rotates and is maintained in a state of non-engagement with the inner teeth, and when the tip comes into contact with the inner protrusion piece. A seatbelt retractor comprising a hook that rotates to release the disengaged state and prepare for engagement with the internal teeth.