JPH0810538Y2 - Belt reacher device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] <Industrial field of application> The present invention moves one end of a seat belt between a standby position behind the front seat and a use position in front of the backrest of the front seat. The present invention relates to a belt reacher device for performing the operation.

<Prior Art> As an auxiliary device for ensuring the ease of wearing the seat belt in the front seat and not hindering the passengers getting in and out of the rear seat of a two-door vehicle, the front seat is opened when the door is opened. There is a belt reacher device configured so that the end of the seat belt moves near the floor between the rear seat and the end of the seat belt moves to the front side of the backrest of the front seat when the door is closed. It has already been put to practical use. As one form of this belt reacher device, an arm whose end is attached to the free end of the seat belt is pivotally attached to the rear side surface of the front seat, and the arm is pivoted on the side of the backrest. There are known ones (see Japanese Patent Application Laid-Open No. 61-110647, etc.).

<Problems to be Solved by the Invention> According to the structure disclosed in the above publication, the driving force for rotating the arm from the standby position to the use position is
The return force from the use position to the standby position, which is given by pulling the cable wound on the sheave integrally provided on the arm, is applied to the cable wound on another sheave. The tension is given by the tension of the coil spring. Therefore, depending on the initial tension of the cable, the smoothness of the operation of the arm may be impaired.

The present invention has been devised to improve such inconvenience, and its main purpose is to reliably apply a driving force in both forward and reverse directions, and also to provide a damper action in both directions. (EN) Provided is a belt reacher device having an improved power transmission mechanism.

[Structure of the Invention] <Means for Solving the Problems> According to the present invention, an arm capable of rotating a seat belt and rotating back and forth at the side of the backrest of the front seat. A drive unit for giving rotational force to the arm, a driven member to which the drive force of the drive unit is directly transmitted, an arm connecting member to which the arm is integrally connected, and a lost motion action for interlocking between them. A belt leecher device having a damper unit composed of a spring means for imparting the drive unit is connected to the output unit of the drive unit and the driven member with an endless transmission band, and the axial center position of the damper unit is driven by the damper unit. The unit and the drive unit are fixed on the bracket for fixing to the side of the seat, and the output shaft of the drive unit and the damper unit are placed between the bracket and the drive unit. Is achieved by a structure in which a spring means for biasing in a direction away of Kokorokan distance between axes.

<Operation> According to such a configuration, the driving force of the electric motor is transmitted to the arm by the endless transmission belt such as a belt, so that the driving force can be reliably applied in both the forward and reverse directions. Moreover, the tension of the belt is properly set by fixing the axial center position of the damper unit and pulling the drive unit side by the spring.

<Embodiment> Hereinafter, the construction of the present invention will be described in detail based on a specific embodiment shown in the accompanying drawings.

FIG. 1 shows the entire front seat side to which the belt reacher device 1 is applied, and a seat belt 4 pulled upward from a retractor device 3 provided near the base of a center pillar 2 in a vehicle compartment is After passing through the through ring 5 provided on the upper part of the center pillar 2, it is folded back downward,
Its end is connected to the free end of the feeder arm 6.

The feeder arm 6 is rotatably pivoted at its base end in the vicinity of a pivotal joint between the seat 7a and the backrest 7b of the front seat 7, and is responsive to the opening / closing operation of a door (not shown). Then
When the door is closed, it is indicated by the solid line, that is, in the use position on the A side of the arrow, and when the door is opened, it is indicated by the imaginary line, that is, toward the standby position on the B side of the arrow. It is designed to make a turning movement.

In this way, when the door is opened, the seat belt 4 does not move to the position along the center pillar 2 so as not to interfere with getting in and out of the rear seat, and when the door is closed, the seat belt 4 is held by the front seat occupant's hand. It will move to a position that is easy to reach.

As shown in detail in FIG. 2, the belt reacher device 1 includes a drive unit P formed by integrally connecting a speed reducer 11 and an electric motor 12, a relay circuit unit C for controlling the drive unit P, and a drive unit. It comprises a damper unit D for transmitting the rotational force of the unit P to the feeder arm 6. Here, the relay circuit unit C is integrated with the drive unit P via an extension member 13 fixed to the housing 11a of the speed reducer 11.

As shown in FIG. 3 as well, the damper unit D includes a driven member 15 having a timing pulley 15a formed therein for transmitting the driving force of the driving unit P to the feeder arm 6 via the timing belt 14, and the driven member 15. An intermediate member 16 that is rotatably fitted to an inner diameter sleeve 15b formed in the center of the feeder member 6, and an intermediate member 16 that is also rotatably fitted to an inner diameter sleeve 15b of the driven member 15, and And an arm connecting member 17 for holding.

Between the driven member 15 and the intermediate member 16, there is provided a first torsion coil spring 18 having a relatively large diameter for biasing the intermediate member 16 in the direction of the arrow U with respect to the driven member 15. There is. The first torsion coil spring 18 has one end 18a engaged with a protrusion 15d formed on the side wall of the driven member 15 and the other end 18b engaged with a protrusion 16b formed on the flange portion 16a of the intermediate member 16. And, it is installed in a slightly retracted state.

An intermediate member is provided between the intermediate member 16 and the arm connecting member 17.
A second torsion coil spring 19 having a relatively small diameter is provided for biasing the arm connecting member 17 in the direction of arrow W with respect to 16. The second torsion spring 19 has its one end 19a engaged with the projection 16c formed on the side wall of the intermediate member 16, and the other end 1a.
9b is attached to the protrusion 17a formed on the side wall of the arm connecting member 17, and is attached in a state in which it is slightly retracted.

These driven member 15, intermediate member 16, and intermediate member
Arc-shaped grooves 16d and 16e extending over a predetermined angle are provided on both surfaces of the intermediate member 16 on the surfaces of the arm 16 and the arm connecting member 17 which face each other in the axial direction, in order to define the rotation range of each other at a predetermined angle. 15 and the arm connecting member 17 with these grooves 16d
・ Protrusions 15e and 17b that enter 16e are provided.

Here, the ends 18a and 18b of the first torsion coil spring 18, the protrusions 15d and 16b of the driven member 15 and the intermediate member 16, and the ends 19a and 19b of the second torsion coil spring 19 to the intermediate member 16 and the arm connection. The respective connecting portions of the member 17 with the respective protrusions 16c and 17a are
Not only in the circumferential direction but also in the axial direction, it is hooked so as not to come off, and the claw 15f formed at the diagonal position of the free end portion of the inner diameter sleeve 15b of the driven member 15 has the arm connecting member 17. Coupled with elastically engaging the opening edge of the central hole 17c, the three members 15, 16 and 17 are integrally held together.

A connecting frame member 20 for connecting between the driving units P and the members 15, 16 and 17 in a state of being combined with each other is formed on the driven member 15 so as to be adjacent to the timing pulley portion 15a. After surrounding 15c,
It is sandwiched between the timing pulley portion 15a and the flange portion 16a of the intermediate member 16.

Flange portion of the intermediate member 16 in the connecting frame member 20
Two stopper protrusions 20a and 20b for defining the rotation limit of the intermediate member 16 are provided on the surface facing the 16a in the axial direction. The flange portion 16a of the intermediate member 16 is provided with a radial projection 16f that can abut the projections 20a and 20b.

As shown in FIG. 4, the speed reducer 11 includes a small helical gear 23 fixed to an electric motor shaft 12a, a large helical gear 24 meshed with the small helical gear 23, a worm gear 25 integrally formed with the large helical gear 24, and a worm gear meshed therewith. It consists of wheels 26. An output shaft that is integral with the worm wheel 26 that extends in a direction orthogonal to the motor shaft 12a
A small timing pulley 28 is fixed to the shaft end of 27.

In connecting the damper unit D and the drive unit P configured as described above, the electric motor 12 is driven prior to assembly, and the speed reducer 11 is in the standby position stopped state (the feeder arm 6 is shown in FIG. 1). (Located on the arrow B side). In parallel with this driven member
The timing belt 14 is hung on the timing pulley portion 15a of 15 and the position of the radial projection 16f of the intermediate member 16 is aligned with the middle of the mark 20f provided on the outer peripheral portion of the connecting frame member 20 (FIG. 5). . Then, while maintaining this state, the timing belt 14 is hung on the small timing pulley 28 of the speed reducer 11. Thereby, the phase angles of the speed reducer 11 and the feeder arm 6 can be matched with each other.

The connecting frame member 20 is formed with an extended portion 20d in the radial direction, and a long hole 20e provided therein is engaged with a protruding portion 11b provided on the housing 11a of the speed reducer 11, and the protruding portion is formed.
The drive ring 11 and the damper unit D are sub-assembled by fitting the stop ring 29 to the protrusion 11c provided on the shaft 11b to prevent the stop ring 29 from coming off.

Next, by attaching the retainer roller 30 to the housing 11a of the speed reducer 11 with a minute gap on the outer peripheral surface of the timing belt 14 wound around the small timing pulley 28, the portion of the connecting frame member 20 that faces the outer peripheral surface of the timing belt 14. The timing belt 14 is prevented from jumping in cooperation with the protrusion 20c formed on the.

Under this condition, there is an appropriate radial play between the drive unit P and the damper unit D,
The timing belt 14 is in a slightly loose state.

Next, the inner hole of the inner peripheral sleeve 15b of the driven member 15 is fitted into the boss 31a protruding from the bracket 31 fixed to the side surface of the seat, the anchor bolt 32 is tightened together with the feeder arm 6, and the extension member 13 and the bracket are attached. A coil spring that pulls between the locking pieces 13a and 31b formed on the
Install 33 (Fig. 6). As a result, the drive unit P
Is urged in a direction (arrow T) away from the damper unit D, and accordingly, an appropriate tension is applied to the timing belt 14. As a result, the drive unit P is moved into the damper unit D by screwing the fixing bolts 34 into the tap holes 31c formed in the bracket 31 through the bolt holes 11d (three places) provided in the housing of the speed reducer 11a. It is also fixed to the bracket 31, that is, the side surface of the seat.

Next, the configuration of the control circuit will be described with reference to FIG.

The anode of the battery B is connected to the first terminal connected to the +12 volt line of the circuit board CB via the fuse F.

One terminal of the door switch DS is connected to the ground line G, and the other terminal is connected to the second terminal of the circuit board CB. A room light RL is connected between the other terminal of the door switch DS and the anode of the battery B.

The third terminal connected to the 0 volt line of the circuit board CB is connected to the ground line G.

Worm wheel that is the final gear of drive unit P
The common contact of the rotary switch LS integrally provided on the axial end face of 26 is connected to the 4th terminal connected to the +12 volt line of the circuit board CB. The use position side stop contact of the rotary switch LS is connected to the 5th terminal of the circuit board CB, and the standby position side stop contact of the rotary switch LS is connected to the 8th terminal of the circuit board CB.

Both pole terminals of the electric motor 12 are connected to the 6th and 7th terminals of the circuit board CB, respectively.

Between the 2nd terminal and the +12 volt line, a diode
D8 and the coil of the door switch relay DR are connected in series.

The common terminal of the door switch relay DR is connected to the 0 volt line. The diode D1, the transistor T1, and the coil of the first relay MR1 for motor control are connected in series between the normally closed contact of the door switch relay DR and the fifth terminal. Also, between the normally open contact of the relay and the 8th terminal, diode D3 and transistor T2
And a coil of the second relay MR2 for motor control are connected in series.

The common terminal of the first relay MR1 is connected to terminal 6, the normally open contact of the relay is connected to the +12 volt line, and the normally closed contact of the relay is connected to the 0 volt line.

The common terminal of the second relay MR2 is connected to terminal 7, the normally open contact of the relay is connected to the +12 volt line, and the normally closed contact is connected to the 0 volt line.

It should be noted that diodes D5, D6, and D7 for eliminating the back electromotive force are respectively connected to both ends of the coils of the relays MR1, MR2, and DR.

Between the 5th terminal and the base of transistor T1, there is a resistor
R3, capacitor C1, and resistor R1 are connected in series.
At the same time, a resistor R4, a zener diode ZD1, a diode D2, and a resistor R1 are connected between each node between them and the emitter of the transistor T1.

A resistor should be placed between pin 8 and the base of transistor T2.
R7, capacitor C2, and resistor R6 are connected in series.
At the same time, a resistor R8, a zener diode ZD2, a diode D4, and a resistor R5 are connected between each node between them and the emitter of the transistor T2.

 Next, the operating procedure of the above embodiment will be described.

First, the state of FIG. 7 shows that the door switch DS is in the off state, that is, the door is in the closed state. Further, the rotary switch LS indicates that the feeder arm 6 is stopped at the use position side.

When the door is opened under this condition, the door switch DS is turned on and the room light RL is illuminated. At the same time, the coil of the door switch relay DR is excited, and the normally open contact of the relay and the common terminal are electrically connected. On the other hand, in the rotary switch LS, since the common contact and the stop contact on the standby position side are electrically connected, from the +12 volt line, the fourth terminal
Rotary switch LS ~ Pin 8 ~ Resistor R7 ~ Capacitor C2
~ Resistor R6 ~ A current flows to the base of the transistor T2, and the transistor T2 becomes conductive. As a result, the second relay MR2
The coil is excited and the common terminal of the relay and the normally open contact are electrically connected.

On the other hand, since the common contact of the rotary switch LS and the use position side stop contact are open, and the normally closed contact side of the door switch relay is open, in this state, the first relay MR1 is in the demagnetized state. The normally closed contact side of the relay is closed. Therefore, a circuit in which the 7th terminal side of the electric motor 12 serves as an anode is formed, the electric motor 12 rotates toward the standby position, and the feeder arm 6 pivots rearward.

As the electric motor 12 rotates, the rotary switch LS rotates counterclockwise. Then, when the rotary switch LS is rotated to a position where the common contact of the switch and the stop contact on the use position side are closed and the common contact and the stop contact on the standby position side are opened, the coil of the second relay MR2 is demagnetized. Then electric motor 12
Stops.

On the other hand, when the capacitor C2 is charged by the current to the base of the transistor T2, the base potential becomes high and the transistor T2 is automatically turned off. That is, regardless of the contact state of the rotary switch LS, the coil of the second relay MR2 is demagnetized and the electric motor 12 is stopped after a predetermined time defined by the capacity of the capacitor C2 has elapsed.

Next, when the door is closed, the door switch relay DR is demagnetized, and the normally closed contact side of the relay becomes conductive. At this time, in the rotary switch LS, since the use position side stop contact is closed and the standby position side stop contact is open, the transistor T1 becomes conductive and the coil of the first relay MR1 is excited in the same manner as above. Along with this, a circuit in which the 6th terminal side serves as an anode is formed, and the electric motor 12 rotates in the opposite direction to the above. Then, in the same manner as described above, the electric motor 12 is rotated by the clockwise rotation of the rotary switch LS or the charging time of the capacitor C1.
Stops.

Now, for example, when trying to drive the feeder arm 6 from the position B to the position A in FIG. 1, if the rotation of the feeder arm 6 is obstructed by some obstacle, the driven member 15 The first torsion coil spring 18 between the intermediate member 16 and the intermediate member 16 is wound tightly, the driving force applied to the driven member 15 is absorbed, and as a result, the feeder arm 6 is held in a stopped state. This prevents the drive unit P or the feeder arm 6 from being damaged. Further, since the electric motor 12 is automatically stopped for a limited time as described above, there is no possibility of burning due to overload.

On the contrary, when the feeder arm 6 does not move from the position B due to the failure of the electric motor 12, the second torsion coil spring between the intermediate member 16 and the arm connecting member 17
If the feeder arm 6 is rotated against the spring force of 19, the second torsion coil spring 19 is only wound and tightened, and the feeder arm 6 is rotated to the use position side.

Since the relatively weak spring force acts on the bias toward the standby position, the feeder arm 6 can be easily moved to the use position. Further, since the relatively strong spring force acts on the bias toward the use position, the seat belt wearing state at the use position does not become unstable.

[Effects of the Invention] As described above, according to the present invention, since the driving force of the electric motor is transmitted to the arm by the endless transmission belt such as the timing belt, the driving force can be reliably applied in both the forward and reverse directions. The operation smoothness can be improved. Moreover, by fixing the axial center position of the damper unit and pulling the drive unit with a spring, the tension of the belt is properly set, so that the assembling property can be improved.

[Brief description of drawings]

1 is a perspective view showing an entire front seat to which the device of the present invention is applied, FIG. 2 is an exploded perspective view of the device of the present invention, and FIG. 3 is a sectional view of a damper unit. Yes, the fourth
FIG. 5 is a side view of the device of the present invention as seen from the mounting surface to the seat, FIG. 5 is a perspective view of a main part, and FIG.
FIG. 7 is an outside view of the device of the present invention, and FIG. 7 is a control circuit diagram. 1 ... Belt reacher device, 4 ... Seat belt, 6
...... Feeder arm, 7 ...... Seat, 11 ...... Reducer, 12
...... Motor, P ...... Drive unit, C ...... Relay circuit unit, D ...... Damper unit, 14 ...... Timing belt, 15 ...... Driven member, 15a ...... Timing pulley, 1
5b …… Inner diameter sleeve, 15c …… Outer diameter sleeve, 15f ……
Pawl, 16 ... Intermediate member, 16a ... Flange portion, 16f ... Radial protrusion, 17 ... Arm connecting member, 17c ... Center hole, 18 ...
… 1st torsion coil spring, 19 …… 2nd torsion coil spring, 20
...... Connecting frame member, 20a ・ 20b …… Stopper protrusion, 20
c …… projection, 20d …… extension, 28 …… small timing pulley, 30 …… retainer roller, 31 …… bracket, 33 ……
Tension coil spring

Claims (1)

[Scope of utility model registration request] 1. An arm for pivotally moving a connecting portion of a seat belt between a standby position behind the front seat and a use position on the front side of a backrest of the front seat, an electric motor and a speed reducer. A drive unit for giving a turning force to the arm, a driven member to which the drive force of the drive unit is directly transmitted, and a driven member which is combined with the driven member so as to be rotatable relative to a predetermined angle range and is directed to a use position. Drive force is transmitted through the first spring means, and the drive force to the standby position is directly transmitted. The intermediate member is rotatably combined with the intermediate member in a predetermined angular range and is in the standby state. A belt reacher device having a damper unit including an arm connecting member to which the driving force to the position is transmitted via the second spring means and the driving force to the use position is directly transmitted, The output shaft of the engine and the driven member are connected with an endless transmission band, and the axial center position of the damper unit is on a bracket for fixing the damper unit and the drive unit to the side surface of the seat. The spring means is provided between the bracket and the drive unit for urging the output shaft of the drive unit and the shaft of the damper unit so as to separate the inter-center distance from each other. Belt reacher device.