JP3239667B2 - Seat belt retractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt retractor for a vehicle or the like provided with a seat belt pretensioner.

[0002]

2. Description of the Related Art A seatbelt pretensioner in a vehicle is designed to rapidly tighten a seatbelt to preliminarily restrain an occupant's body when the vehicle suddenly decelerates due to a collision or the like, and to surely protect the occupant. However, conventionally, as described in U.S. Pat. No. 5,149,134, the lock switch of the rapid deceleration sensor is pressed in one direction during attachment to the vehicle body, and the operation lock of the rapid deceleration sensor is released. This places the pretensioner of the seat belt in an operable state. Therefore, if the lock switch of the rapid deceleration sensor is hit by something and is accidentally pressed when transporting the seat belt retractor with the pretensioner or assembling it to the vehicle body, sudden When the operation lock of the deceleration sensor is released, the sudden deceleration sensor is activated by the impact of the deceleration sensor, and the pretensioner of the seat belt may malfunction.

[0003]

SUMMARY OF THE INVENTION The present invention ensures that a seatbelt pretensioner malfunctions when transporting a seatbelt retractor provided with a seatbelt pretensioner or when attaching it to a vehicle body. We are trying to prevent it.

[0004]

SUMMARY OF THE INVENTION Accordingly, a seat belt retractor according to the present invention is provided with a retractor body which is mounted in a casing and winds the seat belt so that the seat belt can be pulled out. A seatbelt pretensioner for urging the retractor body in the direction of winding, an arm provided on the casing for locking operation of the rapid deceleration sensor ;
How to unlock the sudden deceleration sensor operation lock by the arm
Lock mechanism biased in the direction, provided in the lock mechanism
Holds the operation lock of the sudden deceleration sensor by the arm
And a mounting portion of the casing, the locking mechanism preventing the lock from being disengaged from the vehicle body when the lock mechanism releases the operation lock of the sudden deceleration sensor by the arm.

[0005]

In other words, a lock mechanism is provided on the casing of the seat belt retractor, the arm of which locks the operation of the rapid deceleration sensor, and when the lock mechanism releases the operation lock of the rapid deceleration sensor, the vehicle body and the casing are locked. The lock mechanism prevents the attachment and detachment of the
As long as the operation lock of the sudden deceleration sensor is released, the attachment and removal of the casing from the vehicle body cannot be performed by the lock mechanism, while the lock mechanism is attached to the arm.
Biased in the direction to release the operation lock of the sudden deceleration sensor.
After installation of the seat belt retractor
Even if the lock mechanism fails, the operation of the sudden deceleration sensor is locked.
Will not be locked.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention shown in the drawings will be specifically described below. 1 and 2, a seat belt retractor 1 includes a seat belt 3 inside a casing 2.
The retractor body that is wrapped so that it can be pulled out is stored,
One end of the seatbelt 3 extends outward from an opening 4 in the upper surface of the casing 2 and a well-known seatbelt pretensioner 5 for urging the retractor main body and rapidly winding the seatbelt 3 in an emergency is provided. .

The casing 2 is provided with an upper stay 7 and a stay 8 having a bolt hole 6, and a lock lever 10 is rotatably supported by a shaft 9 supported by the casing 2, It is slidably guided in the axial direction of the shaft 9, and is urged toward the stay 8 on the shaft 9 by a coil spring (not shown) attached to the shaft 9, and is urged counterclockwise in the figure. Have been.

The lock lever 10 has a flat plate portion 11 whose tip is bent downward, a shielding portion 12 on one side substantially parallel to the flat plate portion 11, and a projection 14 on the other side having a small hole 13 formed therein. The flat plate portion 11 is disposed between the upper stay 7 and the stay 8 to cover the upper portion of the casing opening 4 and the spring portion of the stay 8 is provided by the spring force of the coil spring. Since the lower protrusion 16 of the stay 8 is fitted into the small hole 13 of the protrusion 14, the lock lever 10 is prevented from being displaced in the axial direction of the shaft 9, and at the same time, Clockwise rotation is also restricted.

At this time, as shown in FIG. 2, one end of the seat belt 3 extending outward from the opening 4 on the upper surface of the casing 2 is laterally moved by a lock lever flat plate portion 11 covering the upper part of the opening 4. In addition, since a downward bent portion is formed at the tip of the lock lever flat plate portion 11, a large resistance is required to pull out the seat belt 3 upward from the casing opening 4 as indicated by a dashed line in FIG. With the force acting, such drawers are practically difficult.

On the other hand, in the rapid deceleration sensor 20 of the seat belt pretensioner 5, as shown in FIG. 3, a mass body 21 for sensing a sudden deceleration is slidably accommodated in a cylinder 22, and A stopper 23 extending across the end face of the spring 21 has a gate-shaped notch 24 formed therein.
Is pressed toward the arm 15 of the lock lever 10, and the lock lever arm 15 presses the stopper 23 against the urging force of the spring 25, thereby stopping the displacement of the mass body 21 along the cylinder 22. 23 suppresses the operation of the sudden deceleration sensor 20.

The seatbelt retractor 1 is in an assembled state in which the seatbelt 3 is almost completely wound inside the casing 2 and the lock lever 10 is arranged as described above, and the operation of the rapid deceleration sensor 20 is locked. The seat belt retractor 1 is transported to the vehicle assembly line. In the vehicle assembly line, the seat belt retractor 1 is first attached to the vehicle body by inserting a bolt (not shown) into the bolt hole 6 of the upper stay 7. Since the front surface is not covered by the shielding portion 12 of the lock lever 10, the mounting of the seat belt retractor 1 does not cause any trouble.

Next, after the seatbelt retractor 1 is attached to the vehicle body, the seatbelt 3 is pulled out from the seatbelt retractor 1 and the lock lever 10 is mounted on the coil spring when the seatbelt device is installed in the vehicle interior as a seatbelt device. After turning around the shaft 9 in the clockwise direction in the figure against the urging force to disengage the small hole 13 of the projection 14 from the lower projection 16 of the stay 8, the lock lever 10 is moved to the position of the coil spring. Upper stay 7 along axis 9 against urging force
If it is displaced to the side and brought into contact with the side wall of the upper stay 7, the engagement between the projection 14 and the stay 8 is completely released.

Accordingly, when the hand is released from the lock lever 10 in the above state, as shown in a two-dot chain line in FIG. 2 and FIG. 4, the lock lever 10 is centered on the shaft 9 by the urging force of the coil spring. As the flat plate portion 11 of the lock lever 10 covering the upper part of the casing opening 4 is opened, the seat belt 3 is easily pulled upward from the casing opening 4 and At this time, the shielding portion 12 of the lock lever 10 covers the bolt hole 6 of the upper stay 7 so that the seat belt retractor 1 cannot be removed from the vehicle body, and Arm 15 of lever 10
The stopper 23 is also urged by the spring 25 to be displaced toward the stay 8 due to the rotation of the arm 23 and the pressing of the stopper 23 by the arm portion 15, and as shown by the two-dot chain line in FIG. The mass body 21 of the rapid deceleration sensor 20 is disposed so as to face the gate-shaped notch 24 of the stopper 23, and the cylinder 22
The operation lock of the rapid deceleration sensor 20 is released because the internal sliding is enabled.

Further, since the lock lever 10 is urged by the coil spring and is automatically rotated in the operation unlocking direction of the sudden deceleration sensor 20, the lock lever 10
The lock lever 10 does not stop at an intermediate position between the operation lock of the sudden deceleration sensor 20 by the arm 15 and the release of the operation lock, and the distinction between the operation lock of the sudden deceleration sensor 20 and the operation lock release is always clear. Further, when the lock lever 10 is urged toward the stay 8 by the coil spring and locked on the inner surface of the stay 8, the projection 14 engages with the end face of the stay 8, and the lock lever 10 is locked. This prevents the lever 10 from rotating carelessly.

As described above, while the assembled seatbelt retractor 1 is being transported to the vehicle assembly line, and at the vehicle assembly line, the seatbelt retractor 1 is attached to the vehicle body using the bolt holes 6 of the upper stay 7. During the mounting, the stopper 23 is pressed by the arm 15 of the lock lever 10 to lock the operation of the sudden deceleration sensor 20. Further, in order to release the operation lock of the sudden deceleration sensor 20, the lock lever 10 is released. Since operation in two directions different from rotation and linear displacement is required, the stopper 23 of the rapid deceleration sensor 20 is not suitable when the seatbelt retractor 1 is carried or when the seatbelt retractor 1 is assembled on a vehicle body. Even if it is hit or accidentally pressed, the operation lock of the sudden deceleration sensor 20 is not released. URN is completely prevented, thus, can be able to reliably eliminate the risk of rapid deceleration sensor 20 is malfunctioning unexpectedly, to ensure the safety of bearers and workers.

Further, the seat belt retractor 1
4, when the operation lock of the rapid deceleration sensor 20 is released as shown in FIG. 4, the bolt hole 6 of the upper stay 7 is covered by the shielding portion 12 of the lock lever 10 and the removal operation is not possible. Therefore, by operating the lock lever 10 in two different directions of linear displacement and rotation in the completely opposite procedure, the arm 15 of the lock lever 10 presses the stopper 23, and Only after the operation of the deceleration sensor 20 is locked can the mounting work of the seat belt retractor 1 be possible. In this case as well, malfunction of the sudden deceleration sensor 20 is prevented, and the safety of the worker can be ensured.

In the above embodiment, the lower projection of the stay is fitted into the small projecting hole of the lock lever to prevent the linear displacement and rotation of the lock lever, thereby ensuring the operation of the rapid deceleration sensor. The engagement between the lock lever projection and the stay, for example, can be achieved by abutting the lock lever projection on the lower surface of the stay and simultaneously bending the tip of the stay upward so that the outer surface of the stay Needless to say, the shape can be appropriately changed as needed within the range of achieving the purpose of engagement, such as engagement.

[0018]

In the seat belt retractor according to the present invention, when the lock mechanism releases the operation lock of the sudden deceleration sensor, the engagement and disengagement between the vehicle body and the mounting portion of the casing is prevented by the lock mechanism. As long as the operation lock is released, the attachment and detachment of the casing to and from the vehicle body cannot be performed by the lock mechanism, so that the safety of the worker can be easily secured , and the lock mechanism is rapidly decelerated by the arm. Making a sensor
Is biased in the direction to release the
If the lock mechanism breaks down after installing the retractor
However, since the operation of the sudden deceleration sensor is not locked,
Make sure that the seat belt pretensioner is
Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line II-II of FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a diagram illustrating the operation of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat belt retractor 2 Casing 3 Seat belt 5 Seat belt pretensioner 7 Upper stay 8 Stay 10 Lock lever 11 Flat plate part 12 Shielding part 14 Projection part 15 Arm part 20 Rapid deceleration sensor 21 Mass body 23 Stopper

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60R 22/12-22/48

Claims (5)

(57) [Claims] A seat belt pretensioner mounted in a casing for retracting the seat belt so that the seat belt can be pulled out; a seat belt pretensioner for urging the retractor body in a direction in which the seat belt is rapidly retracted by operation of a rapid deceleration sensor; An arm provided on the casing for locking the operation of the rapid deceleration sensor ;
Locking mechanism in a direction to release the operation lock rapid deceleration sensor is biased, by the arms provided on the lock mechanism
A holding mechanism for holding the operation lock of the rapid deceleration sensor, and
And a seat belt retractor having an attachment portion of the casing in which the lock mechanism prevents engagement and disengagement with the vehicle body when the operation mechanism of the sudden deceleration sensor by the arm is released by the lock mechanism. 2. The device according to claim 1, wherein the lock mechanism is
Rotatably supported by the casing and in the axial direction
Slidably supported, and the holding mechanism has an arm
With the operation of the sudden deceleration sensor locked,
To stop rotation and sliding of the lock mechanism.
A seat belt retractor constructed urchin. 3. The seat mechanism according to claim 1, wherein the locking mechanism is formed on the casing.
Cover, pull out the seat belt
A seatbelt retractor configured to suppress pulling out. 4. The method of claim 3, the lock mechanism is on
The holding mechanism holds the operation lock of the sudden deceleration sensor.
Pull out the seat belt from inside the casing when
And the sheet is released when the holding action is released.
A seat belt retractor configured to release restraint of belt withdrawal . 5. The lock according to claim 1, wherein the arm of the lock mechanism is an operation lock of the rapid deceleration sensor.
A seatbelt retractor configured to press a stopper urged in a direction to release the pressure, thereby locking the operation of the rapid deceleration sensor.