JPS5823260B2 - Passive seat belt device actuation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an actuating device for a passive seat belt device for protecting an occupant in an automobile or the like.

In order to ensure the safety of passengers in automobiles, etc., when a passenger gets in the car, the seat belt automatically fits the passenger's body regardless of the passenger's will, and the seat belt is automatically attached to the door.

Passive seatbelt devices have already been developed in which the seatbelt automatically moves away from the occupant's body when opened, allowing the occupant to get on and off the vehicle freely.

However, with conventional passive seat belt devices, a door switch that is activated when the door closes activates a drive device such as a motor to move the seat belt from the non-restraint position to the restraint position, or when the door closes from the open position. Using its own movement as a power source to operate the seat belt to the restraint position, etc.
In any case, it is normal for the seatbelt to operate to the restraint position as soon as the door is closed, regardless of the occupant's seating position, and the seatbelt may not fit properly while the occupant is still in an unnatural position. There are many cases where seatbelts are not being used.

If the seat belt is not worn properly, a powerless force is applied to the belt and the driving device such as the motor, which is not good for the device itself and for the occupant.

In addition, in order to eliminate the problem of the seatbelt device operating unnecessarily when the door is closed after the passenger exits the vehicle, a switch such as a seat switch is installed to detect when the passenger is seated, and only when the passenger is seated and closes the door. A seatbelt device that operates in the restraint position has already been developed (in 1987).
1-59018), the problem mentioned above is that simply detecting the occupant's seating may cause the seat belt to fit the occupant's body in an unnatural seating position. It cannot be resolved.

The present invention addresses the above-mentioned conventional problems and enables a seatbelt to be worn at all times in a normal seating position.The present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a diagram showing an example of a passive seat belt device to which the present invention is applied. The seat belt consists of a lap belt 1b whose one end is connected to the shoulder bell 1a and whose end is attached to the rear lower part of the door 3.

A guide device 5 such as a rail is provided on a side member of the upper part of the vehicle body, and a through hole 6 inserted through the seat belt 1 is fitted into the guide device 5, and the through hole 6 is guided by the guide device 5. It is designed to be able to move forward and backward.

7 is a winding device rotated by a drive device M such as a motor;
The winding device 7 and the through hole 6 are connected by a cable 8, and when the winding device 70 rotates, the through hole 6 is moved rearward via the cable 8, and the seat held shown by the chain line is placed in the wearing position, or moved forward. It is now possible to set it to a non-wearing position as shown by the solid line.

The rotation of the winding device 7 is normally controlled by the rotation of the drive device M by a door switch that operates in response to the opening and closing of the door. As shown by the solid line in the figure, the seat belt 1 is held by the non-worn device, allowing the occupant to get on and off freely. When the occupant sits down and closes the door, the drive device M is driven and the retractor 7 rotates in the direction to rewind the cable 8. However, as the seatbelt 1 moves backward, the seatbelt 1 is wound up by the retractor 2 and is placed in a wearing position that fits the occupant's body as shown by the chain line.

The present invention combines the drive circuit of the drive device using the conventional door switch as described above with a seated occupant posture detection device that detects that the head of a seated occupant is in a predetermined position and issues a signal, so that the door is closed. It is configured such that the drive device M is driven and the seat belt is operated toward the fastening position only when the occupant seating position detection device operates and issues a signal.

An example of the circuit is shown in FIG.

In FIG. 2, 11 is a light emitting part, and 12 is a light receiving part. The light emitting parts 11 are installed in at least two places on one side of the vehicle body, as shown in FIG. The light receiving section 12 is provided in a corresponding light receiving section 12 so that the light beam emitted from the light emitting section 11 is blocked by the head of the occupant when the occupant is seated in a normal posture.

The length of the human head (above the neck) is usually 20 to 30 mm.
crrL < leprosy, and if the installation positional relationship of the light emitting section 11 and light receiving section 12 is set so as to detect the head position of an average-sized occupant when seated, it can be applied to almost any human body size. It is possible.

If the occupant's head is in a predetermined position when seated, it can be determined that the occupant is in a substantially normal posture.

The light emitting section 11 and the light receiving section 12 constitute an occupant seating posture detection device 13, and when the light from the light emitting section 11 does not reach the light receiving section 12, the amplification section 14 issues a signal A to the AND circuit 15.

On the other hand, the off signal B of the door switch 16 which is turned off when the door is closed is also sent to the AND circuit 15,
When both signals A and B are sent to the AND circuit 15, the switching path 17 becomes conductive, and the coil 18a of the relay 18
A current flows to turn on the relay switch 18b, and the drive device M is driven.

As described above, in the present invention, when the occupant is seated in the vehicle and the door is closed, the drive device M is not driven and the seat belt 1 is still held in the non-fastening position, so that the occupant is seated normally with his head in a predetermined position. Only when the position is reached is the drive device M activated.
is driven and the seat belt 1 restrains the body of the passenger, so the problem of the seat belt restraining the body of the passenger in an unnatural seating position, which is the case with conventional systems, is completely eliminated. This ensures reliable operation without applying undue force to the drive device, etc., and can provide the occupant with a good feeling of fastening the seat belt.

When the door is opened, for example, when the door switch 16 is turned on, the driving device M is reversed through a circuit (not shown), and the winding device 7 winds up the cable 8 and moves the through hole 6 forward to place the seat belt 1 in the non-wearing position. It is something that is activated.

It goes without saying that the present invention is applicable not only to the seat belt device shown in the first figure but also to any passive seat belt device that can automatically move the seat belt to the fastening position using a drive device.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of a passive seat belt device to which the present invention is applied, Fig. 2 is a block circuit diagram showing an embodiment of the present invention, and Fig. 3 A5 shows occupant seating posture detection in the present invention. It is a side view and a top view showing an example of the installed state of the device. 1... Seat belt, M... Drive device, 13...
Occupant seating posture detection device, 15...AND circuit, 16.
...Door switch, 17...Switching circuit, 18
···relay.

Claims (1)

[Claims] 1. In a passive seatbelt device, when the occupant is seated in the vehicle and the door is closed, the seatbelt, which was held in the non-worn position, is driven by a drive device such as a motor to fit the occupant's body into the wearing state. An occupant seating position detection device is provided, which is composed of a light emitting part and a light receiving part that receives the light beam from the light emitting part, and which emits a signal when the head of a seated occupant is in a predetermined position. An operating device for a passive seat belt device, characterized in that the drive device drives the seat belt to a fastening position when a signal from a posture detection device is applied.