JPH0448659B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention rotates a rotary arm with one end of a seat belt attached to its free end, so that when the door is opened, the arm tilts backward. Seat belts are positioned so that they do not interfere with passengers getting on and off the seats.
Regarding a belt reacher device whose arm tilts forward when the door is closed to make it easier for front seat occupants to wear their seat belts, the belt reacher device of the above type has been improved to particularly improve strength and ease of assembly. Regarding the shaft structure of the rotary arm.

<Prior Art> A belt reacher device is provided that facilitates the attachment of the seat belt by attaching one end of the seat belt to the free end of a rotary arm and tilting the rotary arm forward as the door closes. It is disclosed in Japanese Patent Application No. 166601/1989 filed by the same applicant. In this belt reacher, the rotary arm and the rotary unit are pivotally supported by a stud pin that is inserted through the rotary unit attached to the base end of the rotary arm and fixed to a bracket.

Now, for convenience of assembly, there are cases where it is necessary to attach the rotary unit to a bracket provided on the seat in advance and attach the rotary arm afterwards. A conceivable fixing structure in this case would be to fit the rotary arm onto a pivot fixed to the bracket, and screw a bolt into an internal thread installed in the pivot together with the rotary arm. .

However, the rotary unit is equipped with a driving force transmission mechanism and a floating mechanism to prevent excessive force from being applied when the rotary arm gets caught, and its axial dimension is relatively small. It tends to be long. Therefore, since the bending moment acting on the pivot tends to be large, it is advantageous in terms of strength that the engagement length between the bolt and the pivot is large. Also, for reasons of parts management, it is better to insert the bolt into the rotary arm side in advance.

<Problems to be Solved by the Invention> However, if the engagement length between the bolt and the pivot shaft is increased and the engagement portion between the bolt and the pivot shaft is made completely threaded, the screwing operation becomes troublesome. Moreover, when the bolt tip is aligned with the open end of the internal thread, the gap between the rotary unit and rotary arm becomes too wide, so the guide pin provided to align the two has to be made longer. ,
This may cause problems in securing space.

In view of such problems in the prior art, the main object of the present invention is to provide a shaft structure of a motor arm for a belt reacher device that can sufficiently withstand large bending moments and also ensures ease of assembly. It is in.

<Means for Solving the Problems> According to the present invention, the present invention has a rotary arm in which one end of the seatbelt is connected to its free end, and a control cable wound around which is pulled by the door closing motion. a second pulley around which a cable pulled in a direction opposite to the control cable is wound, and a transmission member for transmitting rotational driving force applied to each of these pulleys to the rotary arm. In the shaft structure of a rotary arm for a belt reacher device, the shaft has one end fixed to a fixing member at the lower side of the seat in order to pivotally support a rotary unit comprising:
a tubular member having an internal thread at one end and an inner circumferential surface substantially equal to the root diameter of the internal thread at the other end;
a bolt member that is inserted from the other end of the tubular member and has an external thread that is screwed into the internal thread, and the external thread is screwed into the internal thread to connect the rotary arm and the bolt member. This is achieved by providing a rotary arm shaft structure that is characterized in that it is coupled with a rotary unit.

<Function> In this way, by forming the internal thread only on the proximal end side of the tubular member, the distance between the rotary arm and the rotary unit can be narrowed before the external thread of the bolt member is screwed into the internal thread. Moreover, the length of the engaging portion between the tubular member and the bolt member can be made sufficiently large.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing the entire belt reacher device according to the present invention, in which a belt 1 is let out from a retractor 2, passes through a through ring 3, and is then attached to the free end of a rotary arm 4. When the door is open, the rotary arm 4 is in a backward tilted position as shown by arrow B as shown by the imaginary line, and as the door is closed, it is tilted forward as shown by arrow A. It is designed to tilt towards the position. A tongue plate 5 is secured near the tip of the belt 1, and after the rotary arm 4 is tilted forward, the tongue plate 5 can be easily secured to the buckle 7 by the occupant sitting on the seat 6. become. In this type of belt reacher device, the belt appears in an easy-to-attach area when the door is closed, so it is possible to effectively encourage the use of the belt without giving the occupant a feeling of restraint. I can do it.

Various drive sources can be used to drive such a belt reacher device, especially the rotary arm 4, but in the case of this embodiment,
The control cable 9 is attached to one end of the door checker in the door panel, and the control cable 9 is connected to the rotary unit 8 provided on the tilting axis of the rotary arm 4 using the closing force of the door.
The door closing force is transmitted as a traction force, and the rotary arm 4 is driven using the door closing force as a driving source.

2 and 3 show the rotor unit of FIG. 1 in detail. One end of the outer cable 19 of the control cable 9 is attached to the fixing bracket 11a of the seat assembly, and the inner cable 18 is inserted into the fixed bracket 11a, and the free end of the inner cable 18 is connected to the pulley 1 that serves as the first transmission member.
It is wound around 3. The pulley 13 has a pivot 1 fixed to the fixed bracket 11a of the seat assembly.
2 is rotatably supported. The pivot shaft 12 further supports a pulley 14, which is a second transmission member, at a position adjacent to the pulley 13.
The cable 22 wound around the cable 22 is connected to one end of a tension coil spring 23 via a guide 21 fixed to the fixed bracket 11a. The other end of the tension coil spring 23 is engaged with a fixed bracket 11b integrally provided with the seat assembly, and biases the pulley 14 to rotate in one direction via a cable 22.

The pivot 12 further rotatably supports a disk member 15, which constitutes a third transmission member, at a position adjacent to the second pulley 14. A mounting hole 17 and a pin 16 are formed in this disc member 15. A guide pin 37 fixed to the rotary arm 4 is inserted through the mounting hole, and one end of a damper 10 for controlling the movement of the rotary arm 4 is connected to the pin 16. Furthermore, the anchor bolt 31, which is rotatably inserted into the rotary arm 4, is screwed into the internal thread in the pivot 12, as will be described later, so that the rotary unit 8 and the rotary arm 4 are combined. There is. Further, a stopper protrusion 24 is integrally provided at a suitable position on this disc member 15, and works in conjunction with a stopper member 25 made of rubber attached to a bracket 11a that is integrally fixed to the seat assembly. The maximum forward tilt position of the rotary arm 4 is determined.

4 and 5 are exploded perspective views showing in detail the relationship between the pulleys 13, 14 and the disk member 15. FIG. As shown well in Figure 4,
An annular recess 14b is formed in the surface of the pulley 14 facing the disk member 15, and a torsion coil spring 26 is received in the recess 14b. One end 26a of the torsion coil spring 26 is engaged with a hole 14a provided on the side of the pulley 14, and the other end 26b is similarly engaged with a hole (not shown) provided on the side of the disc member 15. Further, the opposing surfaces of the disc member 15 and the pulley 14 each have protrusions 27 and 28 provided at an angle of approximately 45° on the same circumference concentric with the rotation axis. The respective side ends of these protrusions abut against each other, thereby limiting the range of relative rotation between the disc member 15 and the pulley 14.

As shown in FIG. 5, the disc member 15 and the pulley 14 are
When the driving force is transmitted in a direction to tilt the rotary arm 4 forward toward the direction of the rotary arm 4, the driving force is transmitted through the torsion coil spring 26, and when the driving force is transmitted in a direction to tilt the rotary arm backward toward the direction shown in FIG. The protrusions 27 and 28 are in contact with each other so that power is directly transmitted.

As clearly shown in FIG. 5, the second pulley 14 and the first pulley 13 each have an annular groove 2 along the same circumference concentric with the central axis.
9 and protrusions 30 are provided on mutually opposing surfaces of both pulleys. The annular groove 29 is provided over an angle of approximately 315°, and the protrusion 30 is provided over an angle of approximately 45°. Both pulleys 13 and 14 are arranged so that the protrusion 30 enters the annular groove 29.
are combined.

As mentioned above, the second pulley 14 is always biased by the tension coil spring 23 in a direction to tilt the rotary arm 4 backward, and as the door closes, the inner cable 18 is pulled and the first pulley 13 is pulled. When rotating, the protrusion 30 comes into contact with one edge of the annular groove 29, and rotational driving force is transmitted from the first pulley 13 to the second pulley 14.
However, if the door is opened while the rotary arm 4 is forcibly held in a forward-inclined state for some reason, the protrusion 30 moves backward in the groove 29, causing the pulley 13 to move toward the pulley 14 and the door. The door can be restored to the open position independently of the disc member 15.

Further, as clearly shown in FIG. 6, the pivot shaft 12 is made of a tubular member, and an outward flange 12a is integrally formed at its base end, that is, the end on the seat side. It is fixed to the fixed bracket 11a by welding or the like.
An internal thread is cut on the base end side of the inner circumferential surface of the pivot shaft 12, and the free end side, that is, the part on the rotary arm side presents a smooth surface with the same inner diameter as the root of the internal thread. .

An external thread 32 is generally cut in the part of the anchor bolt 31 that serves as the pivot axis of the rotary arm 4 that protrudes into the pivot shaft 12, but the diameter near the head is slightly larger than that of the external thread 32. A large diameter portion 34 having a smooth surface is formed, and a portion between the external threaded portion 32 and the large diameter portion 34 forms a small diameter portion 33 having a smaller diameter than the external threaded portion 32. The rotary arm 4 is rotatably supported on the large diameter portion 34 of the anchor bolt 31, and the small diameter portion 33 has a collar 36, for example, made of two halves, which restricts the axial play of the rotary arm 4. is fitted. Therefore, when the anchor bolt 31 is screwed into the inside of the pivot 12, the rotary arm 4 is rotatably held between the head of the anchor bolt 31 and the collar 36, and the collar 36 is attached to the large diameter of the anchor bolt 31. section 34 and axis 12
It will be held between the free end surface of the

The operation of the embodiment of the present invention will be explained below with particular reference to FIGS. 4 and 5.

First, when the door is open, no tractive force is generated on the inner cable 18, and the rotary arm 4 is in a rearward tilted position as shown by the imaginary line in FIGS. 2 and 3. When the occupant takes a seat and closes the door, the inner cable 18 is towed and the fourth
The first pulley 1 is moved in the direction shown by the arrow a in FIG.
3 is rotationally driven. Then, the protrusion 30 of the first pulley 13 comes into contact with the edge of the annular groove 29 of the second pulley 14 and drives the second pulley 14, and the second pulley moves against the spring force of the tension coil spring 23. 14 in the direction of arrow a. At the same time, the second pulley 14 connects the disc member 1 via the torsion coil spring 26.
5 in the direction of arrow a to tilt the rotary arm 4 forward. In this way, the occupant can reach the tongue plate 5 located near the free end of the rotary arm in a natural posture, and can easily engage the tongue plate 5 with the buckle 7 and fasten the seat belt.

Since the driving force is transmitted between the second pulley 14 and the disc member 15 via the torsion coil spring 26, the forward tilting speed of the rotary arm 4 is controlled appropriately by the damper 10 connected to the pin of the disc member 15. can be controlled. Furthermore, even if the rotary arm 4 comes into contact with some kind of obstacle while tilting forward, the driving force to tilt the rotary arm 4 forward is absorbed by the torsion coil spring 26, so that no unreasonable force is applied to the rotary unit. is never added.

When the door is closed and the tongue plate is released from the buckle 7, the rotary arm 4 is still in the forward tilted position. If the door is opened at this time, the pulling force of the inner cable 18 is lost, and the restoring force of the tension coil spring 23 causes the second pulley 14 to rotate in a direction that tilts the rotary arm 4 backward. Then, the protrusion 28 provided on the second pulley 14 connects with the protrusion 2 provided on the disc member 15.
7 and directly tilts the arm 4 backward. If some obstacle comes into contact with arm 4,
If the arm 4 cannot tilt backward even though the door is opened, the protrusion 30 of the first pulley 13 is in the groove 2.
9, the first pulley 13 freely rotates relative to the second pulley 14, and the inner cable 18
No excessive force is applied to the When the obstacle abutting the rotary arm 4 is removed, the rotary arm 4 returns to the rearward tilted position by the restoring force of the tension coil spring 23.

Next, the rotary unit 8 of the rotary arm 4
The assembly procedure will be explained with particular reference to FIGS. 6 and 7. When the anchor bolt 31 inserted through the rotary arm 4 is inserted into the inner hole of the pivot shaft 12, the tip of the anchor bolt 31 is fixed to the rotary arm 4 before reaching the end of the internal thread cut deep inside the pivot shaft 12. The guide pin 37 thus formed is inserted into the hole 17 provided in the disc member of the rotary unit. Here, if the internal threaded portion of the pivot 12 is cut over its entire length, the anchor bolt 31
While tightening the anchor bolt 31, care must be taken to ensure that the guide pin 37 enters the corresponding hole, whereas in the case of the present invention, since the internal thread is partially provided, Since the guide pin 37 projects into the corresponding hole, the labor required for assembly is greatly reduced.

Next, when the anchor bolt 31 and the internal thread of the pivot shaft 12 are screwed together, the collar 36 comes into contact with the free end surface of the pivot shaft 12. When the anchor bolt 31 is further tightened, the collar 36 is firmly clamped between the free end surface of the pivot shaft 12 and the large diameter portion 34 of the anchor bolt 31, and in this way, the rotary arm 4 is tightened to the anchor bolt 31.
As a result, it is rotatably assembled to the rotary unit 8.

If an external force is applied to the rotary arm 4, the resulting moment force will act on the threaded part between the anchor bolt 31 and the pivot shaft 12, and the problem is that the overall length of this part is short, but the anchor bolt When a large moment force is applied to the anchor bolt 31, the anchor bolt 31 bends and deforms and comes into contact with a smooth portion of the inner circumferential surface of the pivot shaft 12, so that no strength problems occur.

<Effects of the Invention> As described above, according to the present invention, the internal thread is formed only on the proximal end side of the inner hole of the pivot shaft, and the inner hole on the free end side is formed smoothly so that it can be brought into close contact with the outer diameter of the bolt. The fitting length of the anchor bolt into the inner hole of the pivot is sufficiently long to increase bending strength, and the rotary unit and rotary arm are sufficiently close together when the anchor bolt is inserted into the inner hole. Even if the guide pin for positioning between these is relatively short, it can be engaged with the corresponding hole. In addition, ease of assembly is improved because the amount of screwing is small.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the overall configuration of a belt reacher device based on the present invention. FIG. 2 is a partially cut-away plan view of the belt reacher device shown in FIG. 1; FIG. 3 is a side view of the same essential parts of the above embodiment. FIGS. 4 and 5 are exploded perspective views showing in detail the mutual relationship of the three transmission members used in the above embodiment. FIG. 6 is a sectional view of the anchor bolt 31 and rotary unit 8 of the above embodiment in a completely assembled state. FIG. 7 is a sectional view of the anchor bolt 31 and rotary unit 8 of the above embodiment in an initial state of assembly. 1... Belt, 2... Retractor, 3... Through ring, 4... Rotary arm, 5... Tongue plate, 6... Seat, 7... Buckle, 8...
... Rotary unit, 9 ... Control cable, 10 ... Damper, 11a, 11b ... Fixed bracket, 12 ... Pivot, 13 ... First pulley, 14 ... Second pulley, 14a ... Hole, 14
b... depression, 15... disc member, 16... pin,
17...Mounting hole, 18...Inner cable, 19
... Outer cable, 21 ... Cable guide,
22...cable, 23...tension coil spring,
24... Stopper projection, 25... Stopper member,
26...Torsion coil spring, 26a, 26b...End portion, 27, 28...Protrusion, 29...Annular groove, 30
... Projection, 31 ... Anchor bolt, 32 ... External thread, 33 ... Small diameter part, 34 ... Large diameter part, 36 ...
Color, 37...Guide pin.

Claims (1)

[Scope of Claims] 1. A rotary arm with one end of the seat belt connected to its free end, a first pulley around which a control cable towed by the door closing motion is wound, and a first pulley in the opposite direction to the control cable. The lower part of the side surface of the seat is fixed to pivotally support a second pulley around which a cable to be pulled is wound, and a rotary unit consisting of a transmission member for transmitting the rotational driving force applied to each of these pulleys to the rotary arm. In the shaft structure of a rotary arm for a belt reaching device, which comprises a pivot shaft with one end fixed to a member, the pivot shaft has an internal threaded portion on the one end side and has an internal thread approximately equal to the root diameter of the internal thread. It consists of a tubular member having a peripheral surface on the other end side, and a bolt member having an external thread inserted from the other end side of the tubular member and screwed into the internal thread, and the external thread is connected to the internal thread. A shaft structure of a rotary arm, characterized in that the rotary arm and the rotary unit are connected by screwing.