JP3580642B2 - Safety device for seat belt device with pretensioner - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a safety device for a seat belt device with a pretensioner in a vehicle.
[0002]
[Prior art]
A belt winding device (emergency lock retractor) having a function of sensing an impact generated in the event of a collision and locking the belt in a pulling-out direction, and a winding device for the belt winding device. Conventionally, there is provided a pretensioner which is rotated in a taking direction and forcibly tightens a belt to enhance occupant restraint.
[0003]
The pretensioner is usually mounted integrally with the belt winding device, and when a sensor detects a collision, explosives are exploded and the explosive gas activates the actuator to forcibly rotate the belt winding mechanism in the winding direction. The pre-tensioner is an electric actuation mechanism that operates by the electric signal of the sensor, and the mechanical actuation mechanism is a pre-tensioner that mechanically operates by sensing the impact of a collision with an inertial body. It is roughly divided into.
[0004]
Of the above, those with an electric actuation mechanism do not pose a risk of erroneous explosion unless the electrical circuit is connected, but the pretensioners of the mechanical actuation mechanism cause erroneous explosions due to vibrations during the transfer of parts or installation work, etc. Safety devices are conventionally provided to prevent such accidental explosions. The safety device is released after a seat belt device having a pretensioner of a mechanical operating mechanism is attached to a vehicle body.
[0005]
However, there is a concern that the operator may forget to release the safety device only by instructing that the safety device must be released after the mounting. As a countermeasure, a belt winding device with a pretensioner is attached to the vehicle body, and then a trim (interior material) attached to the vehicle body is used to cover the belt winding device. A structure in which the lever interferes and the mounting of the trim is hindered has been conventionally developed and is disclosed in Japanese Utility Model Laid-Open Publication No. Hei 6-39633.
[0006]
[Problems to be solved by the invention]
As described above, if the safety device is not released, the lever of the safety device protrudes toward the vehicle interior, and the tip of the lever hits the trim (interior material) itself to hinder installation of the trim. There is a problem that if the trim is pressed by mistake without doing so, the trim may be damaged at the tip of the lever and may not be used. Also, a plurality of abutting plates protruding in the shape of a rib are integrally provided on the back surface of the trim so that unless the safety device is released, the lever interferes with the abutting plate and the mounting of the trim is hindered. Is not only complicated and increases the cost of trimming, but also because the projection of a plurality of abutment plates may cause the seat belt to interfere with the corresponding abutment plate and be damaged. There is a problem that it cannot be applied when there is not enough space.
[0007]
An object of the present invention is to provide a configuration that solves the above problems.
[0008]
[Means for Solving the Problems]
The present invention relates to a seat belt with a pre-tensioner, comprising: a belt winding device equipped with a pre-tensioner; and a belt pulled out of the belt winding device, drawn upward, and drawn down through a belt turning member. In the device, while the seat belt device with the pretensioner is handled as an assembly, the belt that is drawn downward is fixed to a member on the frame side of the belt winding device with a holder, and attached to a vehicle body. After finishing, remove the holder, widen the space between the belt that is pulled down and the belt winding device, and the belt that is drawn out and drawn up, and install body trim such as pillar trim between them. Focusing on performing the work, the lever for operating the safety device of the pretensioner is used when the safety device is in the operating state. The holder is detachable by providing a hook portion which engages with the holder and restrains the movement of the holder in the removing direction, and operates the lever to release the safety device. .
[0009]
With this configuration, the seat belt device is mounted on the vehicle body in a state where the safety device of the pretensioner is in the operating state, and the belt pulled down is fixed to the frame-side member of the belt winding device by the holder. When installing interior materials such as pillar trim after attaching to the seat, the interior materials cannot be attached unless the holder is removed, and the safety device must be released by operating the lever to remove the holder. The risk of forgetting to release the safety device after attaching the belt device can be completely eliminated.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
In FIG. 1, reference numeral 1 denotes a belt winding device (emergency lock retractor) integrated with a pretensioner. The belt winding device 1 is stored and attached to a lower part of a vehicle body such as a center pillar, and the belt winding device is provided. The belt 2 routed upward from 1 passes through a belt turning member (belt through) 3 provided at a predetermined height such as a center pillar, and is routed downward, and is fixed to a lower portion of the vehicle body such as a side sill at its lower end. You. An interior material such as a pillar trim 4 is attached to the inside of the vehicle body such as a center pillar between the belt 2a pulled upward and the belt 2b drawn downward, and the belt is wound by the interior material. The configuration of a vehicle seat belt device that is more common than before is to cover the device 1 and the belt 2a that has been routed upward halfway. The pretensioner is of a mechanical operating mechanism, and is equipped with a safety device so as not to cause an accidental explosion during handling such as transporting and mounting work. In FIGS. This is the lever of the safety device.
[0012]
As shown in FIG. 1 (B), the seat belt device as described above is configured to transfer the belt 2b drawn downward to the belt winding device 1 so as to be convenient for handling as an assembly, such as transportation and mounting work. A member on the frame side, such as a mounting bracket 11 provided integrally with the frame, is fixed by a holder 5 and the holder 5 is removed after the seat belt device is mounted on the vehicle body. As shown in the drawing, the assembling work is performed by widening the interval between the belt winding device 1 and the belt 2a and the belt 2b, and mounting an interior material such as the pillar trim 4 between the belt winding device 1 and the belt 2a.
[0013]
The present invention utilizes the holder 5, and as shown in FIG. 1 (B), an engaging portion in which the hook portion 61a of the lever 61 of the safety device engages when the safety device is working on the holder 5. In the state where the hook portion 61a of the lever 61 is engaged with the engaging portion 52, the holder 5 cannot be removed, and when the lever 61 is operated to release the safety device, FIG. As shown in ()), the engagement between the engagement portion 52 and the hook portion 61a is released, and the holder 5 can be removed.
[0014]
That is, if the holder 5 is not removed, the interval between the belt winding device 1 and the belt 2a and the belt 2b cannot be increased, and therefore, the interior material such as the pillar trim 4 cannot be attached to the vehicle body such as the center pillar. In order to attach the material, it is necessary to release the safety device of the pretensioner and remove the holder 5, whereby the risk of forgetting to release the safety device can be properly prevented.
[0015]
Hereinafter, this will be described in more detail with reference to FIGS.
[0016]
As shown in FIG. 1, a mounting bracket 11 made of a sheet metal member is integrally provided on a frame of the belt winding device 1 with a pretensioner, and a belt guide portion 12 is formed above the mounting bracket 11. The belt 2a is guided from the belt winding device 1 by the belt guide portion 12 and is pulled out upward.
[0017]
As shown in FIG. 2, the holder 5 has a main body 51 having a substantially channel-shaped cross-section that holds the belt 2 b drawn downward and the belt guide 12, and one side of the main body 51. For example, a synthetic resin is integrally formed into a shape having a substantially horizontal engaging portion 52 protruding laterally from the portion and a shelf 53 protruding substantially horizontally in a flange shape from the front lower edge of the main body portion 51. At the front corners on both sides inside the main body 51, there are integrally provided projections 51a for reducing the inner width of the channel so that the belt 2b fits but the belt guide 12 does not fit. Thus, in a state where the belt 2b and the belt guide portion 12 are held and secured by the main body portion 51, the belt 2b is prevented from being caught in the belt guide portion 12 made of a sheet metal member in the main body portion 51. ing.
[0018]
As shown in FIGS. 1 (B) and 1 (C), the belt guide portion 12 has a detachable portion 12a having a reduced width below the securing position by the holder 5, and the holder 5 is provided with a detachable portion 12a. It is adapted to be fitted and removed from the attaching / detaching portion 12a. A step portion 12b is formed above the securing position of the belt guide portion 12, and the belt 2a is inserted and guided by a belt insertion portion 12c provided in the step portion 12b. The upward escape of the holder 5 is restrained.
[0019]
As shown in FIG. 3, the pretensioner integrated with the belt winding device 1 includes a G sensor 7 composed of an inertial body, a squib 8, a gas generator 9, and an actuator 10 composed of a cylinder mechanism. When the G sensor 7 moves and the pin 7a at the tip strikes the primer 8, the primer 8 operates to explode the explosive in the gas generating section 9, and the gas generated by the explosion moves the piston 10a of the actuator 10 in the figure. The belt is moved upward and a belt winding drum (not shown) is forcibly rotated in the belt winding direction by the movement.
[0020]
A safety device 6 is provided between the G sensor 7 and the primer 8. The safety device 6 includes a rotating shaft having a stopper 6a for restraining the movement of the G sensor 7, and a lever 61 is fixed to one end of the safety device including the rotating shaft. Then, as shown in FIG. 3 (C), in the operating position of the safety device in which the stopper 6a faces the moving direction of the G sensor 7, the G sensor 7 is restrained from moving in the direction of the primer 8 by the stopper 6a. Therefore, even if the acceleration G that is equal to or more than the predetermined value acts on the G sensor 7, the primer 8 cannot be hit, and there is no risk of accidental explosion. When the lever 61 is turned by 90 °, as shown in FIG. 3 (B), the stopper 6a becomes a release position of the safety device which is displaced from the movement trajectory of the G sensor 7, and the acceleration of the G sensor is increased by a predetermined value or more. 7 can be moved to activate the primer 8. As shown in FIG. 3 (A), a pin 6b provided on the safety device 6 is fitted into a bearing portion 63 that rotatably supports the safety device 6, thereby restricting the operation position and the release position of the safety device. Position restricting portions 63a and 63b are provided, and a spring 62 is interposed between the lever 61 and the end surface of the bearing portion on the case side. The spring 62 moves the lever 61 and the safety device 6 integral therewith in the axial direction ( The pin 6b is urged in the direction opposite to the arrow a, that is, in the direction in which the pin 6b fits into and engages with the position regulating portions 63a, 63b. When the safety device 6 in the operating position is operated to the release position, the lever 61 is first pressed in the axial direction (the direction of arrow a) against the spring force of the spring 62 to slide the safety device 6 in the axial direction. After the pin 6b is disengaged from the position restricting portion 63a, when the lever 61 is rotated in the direction of arrow b, the safety device 6 and the lever 61 integrated therewith are axially moved by the spring force of the spring 62 (in the direction of arrow a). (In the opposite direction), the pin 6b fits into and engages with the position restricting portion 63b to be in the release position. To switch the safety device from the release position to the operating position, the lever 61 may be pressed in the direction of arrow a and rotated in the direction opposite to arrow b.
[0021]
The lever 61 is formed with a hook portion 61a that protrudes in a flange shape, and engages with the holder 5 on the hook portion 61a of the lever 61 at the operating position of the safety device 6, as shown in FIG. The hooks 61 are engaged with the holders 52 in a state where they overlap with each other, and the downward movement of the holder 5 is restrained. When the device 6 is in the release position, as shown in FIG. 1C, the hook portion 61a is at a position disengaged from below the engaging portion 52 of the holder 5, and the holder 5 can be moved downward. It is configured so that
[0022]
With the above-described configuration, when the safety device 6 is in operation, the holder 5 is restrained from moving downward by the hook portion 61a of the lever 61. The operation of shifting to the position and removing it is impossible. If the holder 5 cannot be removed, an interior material such as the pillar trim 4 cannot be attached between the belt guide 12 and the belt 2b.
[0023]
Therefore, when the interior material such as the pillar trim 4 is to be mounted after the belt winding device 1 is mounted on the vehicle body, the safety device 6 is first released by operating the lever 61, and then the holder 5 is shifted downward to be detached. It is necessary to remove the safety device at the position of the portion 12a, and the concern of forgetting to release the safety device after the belt winding device is attached is resolved.
[0024]
It is not usually conceivable that an erroneous assembly in which the interior material such as the pillar trim 4 is to be mounted on the belt 2b drawn downward without removing the holder 5 is normal. Even if the interior material is erroneously assembled, the interior material cannot be assembled unless the holder 5 is removed because the shelf 53 of the holder 5 projects in the vehicle interior direction. The shelf 53 is usually used as a handle when the holder 5 is fitted or removed.
[0025]
The holder 5 removed after attaching the belt winding device 1 to the vehicle body is collected and reused.
[0026]
【The invention's effect】
As described above, according to the present invention, in the assembly of the seat belt device, the belt is fastened to a member on the frame side of the belt winding device, such as the belt guide, so as to be convenient for handling such as conveyance and mounting work. After the seatbelt device is mounted on the vehicle body, the interior material is attached to the vehicle body by attaching the seatbelt device to the vehicle body by using the holder that is to be held, so that the holder cannot be removed unless the safety device of the pretensioner is released. In order to mount the safety device, the safety device must be released and the holder must be removed, whereby the risk of forgetting to release the safety device can be completely eliminated.
[0027]
As described above, the holder, which is an auxiliary component that is removed after the seat belt device is attached to the vehicle body, has a function to prevent forgetting to release the safety device, making the configuration extremely simple and removing it after attaching the seat belt device. The recovered holder can be used as many times as it is, which is very advantageous in terms of cost.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention, in which (A) is an overall perspective view showing a state in which a seatbelt device to which the present invention is applied is attached to a vehicle body, and (B) and (C) are (A). (B) shows a state in which the safety device is operating, and (C) shows a state in which the safety device is released.
2A and 2B are diagrams showing a specific example of the structure of the holder shown in FIG. 1, wherein FIG. 2A is a perspective view and FIG. 2B is a plan view.
3A and 3B are diagrams illustrating an example of a pretensioner, wherein FIG. 3A is a perspective view of FIG. 1C viewed from the back side (in the direction of the arrow Y), and FIG. 3B is a perspective view of the internal configuration of FIG. (C) is a partial perspective view showing an operation state of the safety device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 belt winding device 2 belt 2 a belt 2 b pulled up belt 3 belt pulled down 3 belt folding member 4 pillar trim 5 holder 6 safety device 6 a stopper portion 7 G sensor 8 detonator 9 gas generating portion 10 actuator 11 mounting Bracket 12 Belt guide 12a Removable part 51 Main part 52 Engagement part 61 Lever 61a Hook part 62 Spring

Claims (3)

A seat belt device with a pre-tensioner, comprising: a belt winding device having a pre-tensioner; and a belt pulled upward from the belt winding device and pulled down through a belt turning member. Until the seat belt device with the tensioner is attached to the vehicle body, the safety device of the pretensioner is operated and the safety device is released after the attachment to the vehicle body. A holder is provided for holding the belt pulled down until it is attached to the frame-side member of the belt winding device, and a lever for operating the safety device of the pretensioner is provided with an operating state of the safety device. A hook portion for engaging with the holder and holding the holder so that the holder cannot be removed. Safety device pretensioner with a seat belt apparatus characterized by being configured so as to be capable of removal of said holder out of engagement with the holder and the hook portion by operating the safety device released state. 2. The safety device for a seat belt device with a pretensioner according to claim 1, wherein the frame of the belt winding device includes a sheet metal member configured to guide a belt drawn from the belt winding device and routed upward. The belt is secured to the belt guide by a holder, and the holder is slid downward and removed from the locked and held state to secure the pretensioner. A hook portion provided on a lever for operating the device is configured to engage with the holder so as to restrain downward sliding movement of the holder from the securing and holding state in the operating state of the safety device. A safety device for a seat belt device with a pretensioner. 3. The safety device for a seat belt device with a pretensioner according to claim 2, wherein the holder has a substantially channel-shaped cross-sectional shape in which the holder holds a belt that is routed downward and a belt guide formed of a sheet metal member. A substantially horizontal engaging portion protruding outward from one side of the main body, and a shelf protruding substantially horizontally in a flange shape from the lower front edge of the main body. A flange for engaging the lever for operating the safety device of the pretensioner in a state where the safety device is in operation and overlapping the lower side of the engagement portion of the holder to restrain downward movement of the holder. When the safety device is released by rotating the lever, the hook portion is disengaged from the lower side of the engaging portion, and the holder can be slid downward. Configuration Safety device pretensioner with a seat belt apparatus characterized by being.

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