JPH0717667U - Starter - Google Patents

Abstract

(57) [Summary] [Purpose] If the starter is in the operable state, the work of attaching and detaching is not performed, and malfunctions of the starter can be reliably and easily prevented. Provided is a starting device having an operation preventing mechanism. [Structure] The inertial body 1 is engaged and disengaged by the inertial body 1.
The trigger case 17 of the starting device 10 is provided with a shaft 18 that selectively sets the movement prevention state 5 or the movement possible state. A lever member 23 is integrally formed on one end of the shaft 18.
Is provided, and is oscillated and rotated in conjunction with the rotation operation of the shaft 18. The lever member 23, which is oscillated in conjunction with the rotation of the shaft 18 that is moved to a position where the inertial body 15 is movable, is attached by a mounting screw 5 for attaching the trigger case 17 to the retractor base 6. Positioning on the fastening locus prevents the attachment / detachment operation of the mounting screw 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seat belt tightening device that rotates a retractor take-up shaft in a seat belt retracting direction when a vehicle collides, or an airbag device that protects an occupant from a collision impact by an airbag that is rapidly inflated by gas. The present invention relates to a starter device for operating a starter, and more particularly to improvement of a malfunction prevention mechanism of the starter device.

[0002]

[Prior art]

 In recent years, passive restraint devices such as seat belt tightening devices and airbag devices have been widely used for the purpose of protecting occupants in a vehicle emergency such as a collision. In the seat belt tightening device (pretensioner), for example, a piston is connected to one end of a cord body wound around a pulley attached to a retractor winding shaft and slidably received in a cylinder. The thrust force by the expansion pressure of the gas acting on the piston exerts a tension on the cord, and the cord pulls the retractor take-up shaft in the webbing take-up direction to drive the retractor. The webbing in the state is pulled in in an emergency.

Further, the airbag device includes, for example, a steering wheel, a center pad, a folded airbag, and a module including an inflator (gas generator), and the inflator is ignited in the event of a vehicle collision. However, by rapidly inflating the airbag with the gas that has burned rapidly, the inflated airbag receives the body of the occupant and suppresses the impact force applied to the human body.

Then, as a starting device for detecting a vehicle collision and activating the seat belt tightening device and the airbag device, for example, an operation of an inertial body that is displaced by an inertial force when a vehicle collides is usually used. Fires the ignition pin held in the non-actuated position toward the detonator, which ignites the ignition charge, and the explosive force activates the seat belt tightening device and the airbag device. There is a device.

By the way, in the vehicle assembly process, usually, the seat belt tightening device and the air bag device described above are assembled as an assembly (assembling body) in which the starting device is assembled before being installed in the vehicle in advance, and the assembly is assembled in the vehicle. Although the procedure of mounting is carried out, the starting device should not be accidentally operated in the assembled state before being mounted on the vehicle.

Therefore, the starter is selectively set in an operable state and an inoperable state so that the starter does not accidentally operate in an assembly state before being attached to a vehicle. It is necessary to provide some kind of malfunction prevention mechanism that can be done. Furthermore, in such a malfunction prevention mechanism, at the stage when the function of the malfunction prevention mechanism is no longer necessary (for example, after the installation work to the vehicle is completed), the malfunction of the activation device is set to the operable state. It is also important to make sure that the release operation of the prevention mechanism is executed reliably and no mistakes such as forgetting to release the malfunction prevention mechanism occur.

From such a point of view, for example, a preloader sensor (starting device) disclosed in Japanese Utility Model Laid-Open No. 3-121958 and the like includes a release means for bringing the preloader sensor into an operation blocking state and an operation enable state, When the webbing take-up device and the vehicle body are fastened together, the biasing means biases the unlocking means in the direction in which the operation of the preloader sensor is blocked, and a fastening locus is provided at a position where it interferes with the unlocking means. When the preloader sensor is in an operable state by moving the fastening locus by a predetermined distance to interfere with the releasing means against the biasing force of the biasing means, the releasing means is activated. And a fastening means for bringing the preloader sensor into an operation blocking state by the urging force of the urging means in a state where there is no interference.

Therefore, in the webbing retractor before mounting on the vehicle body, the preloader is prevented from malfunctioning (exploding) by the releasing means and the biasing means that bring the preloader sensor into the operation blocking state. Then, when the webbing retractor is attached to the vehicle body to attach the webbing retractor to the vehicle body, the webbing retractor is fastened to the vehicle body with a release bolt which is a fastening means, and the release bolt interferes with the release means to cause the release means to operate the preloader sensor. It is configured such that the preloader sensor can be operated at the same time as mounting on the vehicle body.

[0009]

[Problems to be solved by the device]

 By the way, the seat belt tightening device and the airbag device are assemblies that use many parts other than the above-mentioned starter device, and are subject to impacts or the like during the work of assembling the seat belt tightening device or the assembly of the airbag device. Since it is possible that the startup device may be activated by mistake, the operating status of the malfunction prevention mechanism can be easily confirmed even with the startup device alone, and when the malfunction prevention mechanism is released, the startup device is inadvertently It is also necessary to consider that the installation work of is not performed.

It is also conceivable that after the assembly is attached to the vehicle, only the starting device may be attached / detached for the purpose of, for example, parts replacement, but the starting device is in a state in which the malfunction prevention mechanism is released. If the careless removal work is performed, it is possible that the starter operates accidentally due to a shock or the like applied during the removal work. For this reason, it is necessary to consider that the work of attaching and detaching the starter is not inadvertently performed when the malfunction prevention mechanism is released.

However, the technique of the malfunction preventing mechanism disclosed in the above-mentioned Japanese Utility Model Laid-Open No. 3-121958 or the like cannot solve such a problem. That is, an object of the present invention is to solve the above-mentioned problem, and to prevent the malfunction of the starter device reliably and easily without attaching and detaching work when the starter device is still in the operable state. It is an object of the present invention to provide a starter equipped with a malfunction preventing mechanism with good assembling ability.

[0012]

[Means for Solving the Problems]

 The above object of the present invention is to detect a vehicle collision by utilizing the operation of an inertial body that is displaced by the inertial force when the vehicle collides, and apply a tension to the webbing to remove the slack of the seat belt. Alternatively, it is a starting device for actuating an airbag device for rapidly inflating an airbag with gas so as to protect an occupant from the impact at the time of a collision, and the starting device is used for assembling the seat belt tightening device or the airbag device. A fastening means for attaching to the body and a restricting means which is disposed in the starting device and selectively brings the inertial body into a movement-prevented state or a movable state, and the inertial body into a movable state. A part of the restricting means moved to the position for locking is arranged on the fastening locus of the fastening means so as to prevent the attachment / detachment operation of the fastening means. It is achieved by the activation device.

[0013]

[Action]

 According to the above configuration of the present invention, a part of the regulating means is positioned on the fastening locus of the fastening means when the regulating means, which is the malfunction prevention mechanism of the starting device, makes the inertial body movable. However, since it interferes with the fastening member or the fastening tool, the starting device cannot be attached to or detached from the assembly of the seat belt tightening device or the airbag device. On the other hand, when the restricting means keeps the inertial body from moving, part of the restricting means does not lie on the fastening track of the fastening means and does not interfere with each other. It can be attached to and detached from the assembly of the airbag device.

[0014]

【Example】

 Hereinafter, a retractor with a pretensioner including a starting device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 are a longitudinal sectional view, a lateral sectional view and a top view of an activating device having a malfunction preventing mechanism according to a first embodiment of the present invention. 4 and 5 are a front view and a side view showing an assembly of a retractor 1 with a pretensioner, which is an assembly of a seat belt tightening device incorporating the starting device.

The retractor 1 with a pretensioner shown in FIGS. 4 and 5 is equipped with a take-up reel 3 around which the webbing 2 can be taken up or drawn out freely, and the take-up reel 3 takes up the take-up reel 3. A winding spring device 8 connected to the shaft constantly urges the webbing 2 in a winding direction. In an emergency, the rotation of the winding shaft is blocked by the known emergency locking mechanism 4 so that the webbing 2 cannot be pulled out any more.

The retractor 1 with a pretensioner has a take-up reel 3 fixed to one side wall of a retractor base 6 formed in a substantially U-shape in an emergency such as a vehicle collision. A pretensioner 7 that is a seat belt tightening device that rotates the take-up shaft in a direction in which the slack of the seat belt is removed is provided. Then, the retractor 1 with a pretensioner is attached to a vehicle body panel as an assembly (assembled body) which is integrally assembled with the retractor in advance to the pretensioner 7.

The pretensioner 7 applies tension to a wire that is wound around a pulley (not shown) attached to one end of the winding shaft, and the tension applied to the wire causes the take-up reel 3 to move. By driving the webbing 2 in the winding direction, the webbing 2 in a state of being stretched over the occupant is retracted in an emergency to remove the slack of the seat belt, and a driving means 9 for exerting tension on the wire. A starting device 10 for activating the drive means 9 in an emergency such as a vehicle collision is provided.

The driving means 9 includes a cylinder 9a slidably receiving a piston (not shown) connected to one end of the wire, a base end portion of the cylinder 9a, and a gas ejection portion of the gas generator. The housing 9b is connected to communicate with the housing 9b, and the starting device 10 that operates the gas generator in response to a predetermined acceleration or more is provided. The gas generator is installed at one open end of the housing 9b. By applying the pressure of the expanding gas to the piston in the cylinder 9a, tension is exerted on the wire whose one end is connected to the piston.

As shown in FIG. 1, the gas generator 12 held in the one opening end of the housing 9b has the above-mentioned one end side of a case 12b enclosing a gas generating agent 12a for generating an expansion gas. A detonator 12c for igniting the gas generating agent 12a is arranged, and when the detonator 12c is ignited by the impact by an ignition pin 13 arranged on the side of the detonator 12c, the gas in the case 12b is thereby ignited. The generating agent 12a burns explosively, and the expanded gas breaks through the thin portion of the case 12b and is ejected into the housing 9b. Therefore, a starter 10 for hitting the detonator 12c with the base side wall of the retractor base 6 sandwiched is fixed to the side of the detonator 12c of the gas generator 12.

The starting device 10 is made of a non-magnetic material such as stainless steel and moves toward the detonator and collides with the detonator 12c to ignite the detonator 12c. The through-hole 15a is formed in a columnar shape along the central axis, and is displaced by a certain amount when a certain impact is applied to cause the ignition pin 13 to collide with the detonator 12c. An inertial body 15 made of a permanent magnet that operates the pretensioner 7, an annular permanent magnet 16 having an inner diameter larger than the outer diameter of the inertial body 15, and a mounting screw that is a fastening means for accommodating them The trigger case 17 made of a non-magnetic material is attached to the side wall of the retractor base 6, and the trigger device 17 is installed in the trigger case 17 to prevent malfunction of the starter 10. And a malfunction prevention mechanism 19 for stopping.

The ignition pin 13 has a firing pin 13a for striking the detonator 12c at the tip, a collar 13b at the middle, and a rear end of the trigger case 17 having a cylindrical rear shape. By being slidably fitted to the wall portion 17c, it is held in the trigger case 17 so as to be able to move forward and backward toward the detonator 12c. The ignition pin 13 is slidably fitted to the rear wall portion 17c via a sleeve 13c fitted to the rear end portion of the inertial body 15 and penetrating the through hole 15a. The sleeve 13c is integrated with the ignition pin 13 by caulking the rear end of the ignition pin 13 or the like. The outer diameter of this sleeve 13c is set larger than the inner diameter of the through hole 15a. Therefore, unless the inertial body 15 is displaced toward the detonator 12c side, the sleeve 13c is located at the rear end of the inertial body 15. The abutment prevents the ignition pin 13 from moving toward the detonator 12c.

The firing pin 13a is inserted through an opening 17b formed in the front wall portion 17a of the trigger case 17 located on the detonator side to face the detonator 12c with a gap, and the collar portion 13b is connected to the front wall portion 17a. It faces with the inner wall surface with a gap. The outer diameter of the collar portion 13b is set larger than the inner diameter of the through hole 15a. Therefore, when the malfunction preventing mechanism 19 is set in a state in which the inertial body 15 is allowed to move, and the inertial body 15 is displaced toward the detonator 12c side by a certain amount or more, the inertial body 15 collides with the collar portion 13b. As a result, the ignition pin 13 moves toward the detonator side with a certain amount of motion energy and the firing pin 13a strikes and detonates the detonator 12c.

The inertial body 15 and the annular permanent magnet 16 are arranged in the trigger case 17 such that they are located in the trigger case 17 while being separated from each other in the direction of the central axis of the ignition pin 13. The inertial body 15 is fitted to the front wall portion 17a side of the inside, and is slidably fitted to the rear wall portion 17c side of the trigger case 17 along the central axis of the ignition pin 13. Further, the inertial body 15 and the annular permanent magnet 16 are arranged so that adjacent magnetic poles have the same pole (S pole-S pole in the illustrated example). Therefore, the inertial body 15 is slidable toward the detonator 12c side along the central axis of the ignition pin 13 if the malfunction preventing mechanism 19 is set in a state that allows the movement of the inertial body 15. However, due to the repulsive force of the magnetic force, it is urged toward the rear wall portion 17c of the trigger case 17 which is separated from the detonator 12c, and acts between the annular permanent magnet 16 and the inertial body 15 due to impact or the like. The inertial body 15 cannot move in the detonator direction unless a force in the detonator direction having a magnitude greater than the repulsive force of the magnetic force acting on the inertial body 15.

The malfunction prevention mechanism 19 is used to remove the starting device 10 from or to the retractor base 6 of the retractor 1 with pretensioner, or after the pretensioner is attached to the retractor base 6. This is to prevent the occurrence of an accident in which the starting device 10 is activated and the gas generator 12 is activated due to an excessive impact during the work of assembling the tractor 1 assembly to the vehicle body. .

The erroneous operation preventing mechanism 19 crosses the upper part of the guide hole of the trigger case 17 between the bottom wall side end 16a of the annular permanent magnet 16 and the detonator side end 15b of the inertial body 15. It has a shaft 18 penetrating through a hole 17d provided in the above, and which is a restricting means for selectively making the inertial body 15 in a movement blocking state and a movable state. As shown in FIGS. 2 and 3, the shaft 18 is integrally provided with a lever member 23 projecting outward in the radial direction at one end thereof so as to prevent the shaft 18 from coming off from the trigger case 17 and to have a compression coil spring 22. The spring pin 20 is wound around and fixed to the other end by press fitting, and can be rotated within a predetermined range by operating the spring pin 20 as described later. In addition, an intermediate portion of the shaft 18 corresponding to the guide hole of the trigger case 17 is formed in a substantially semicircular cross section, and a cutout portion 18a capable of taking a rotation phase that does not interfere with the inertial body 15 is formed. .

As shown in FIG. 3, at the peripheral end of the hole 17d on the side facing the spring pin 20, positioning grooves 21 are paired to fit the spring pin 20 and are orthogonal to each other in a cross shape. Are arranged so as to lock the spring pin 20 to prevent the shaft 18 from rotating, and serve to indicate a reference position when the shaft 18 is rotated 90 ° by the rotation operation of the spring pin 20. .

The compression coil spring 22 is provided by being fitted onto one end of the shaft 18 protruding outside the trigger case 17, and the lever member 23 integrally formed with one end of the shaft 18 and the trigger. The case 17 is used as a spring seat. In this way, the spring pin 20 is held in the state of being engaged with the positioning groove 21 by the biasing force of the compression coil spring 22, so that when the shaft 18 is rotated, the biasing force of the compression coil spring 22 is applied. Against this, the shaft 18 is moved in the axial direction so that the spring pin 20 is once pulled out from the positioning groove 21, and then the spring pin 20 is rotated about 90 degrees and fitted into another positioning groove 21. I have to do it.

Therefore, when the malfunction prevention mechanism 19 is set, the spring pin 20 is at the position shown in FIG. 1, and the bottom surface of the cutout portion 18 a of the shaft 18 is the inertial member 15. It faces the upper part of the detonator side end 15b. Therefore, the inertial body 15 and the shaft 18 interfere with each other, and the inertial body 15 is in a movement blocking state in which the movement toward the detonator is blocked, and the sleeve 13c attached to the rear end portion of the inertial body 15 is located on the bottom wall side of the inertial body 15. Since the ignition pin 13 that is in contact with the end cannot move in the detonator direction relative to the inertial body 15, the starter 10 cannot operate (see FIG. 2).

As shown in FIGS. 2 and 3, the trigger case 17 has two screw insertion holes 17g and 17h in a flange portion 17f integrated with the front wall portion 17a. These screw insertion holes 17g and 17h are inserted into a mounting screw 5 (see FIG. 5) which is a fastening means for mounting the trigger case 17 to the side wall of the retractor base 6, and the side wall of the retractor base 6 and the housing 9b. It is fastened together with the flange part.

The lever member 23, which is a part of the shaft 18, is a swinging piece that protrudes outward in the radial direction from one end of the shaft 18, and swings and rotates in conjunction with the rotational movement of the shaft 18. To do. When the shaft 18 is set in a state of interfering with the inertial body 15, the lever member 23 is not located on the fastening locus of the mounting screw 5 that is inserted into the screw insertion hole 17g. As shown in the drawing, the mounting screw 5 is retracted to a position that does not hinder the insertion and fastening work. Further, when the shaft 18 is set so as not to interfere with the inertial body 15, it is located on the fastening locus of the mounting screw 5 inserted into the screw insertion hole 17g, and as shown in FIG. The lever member 23 is held at a position where it interferes with the mounting screw 5 and the driver 4 so that the attachment / detachment operation cannot be performed.

That is, in the activation device 10, even if the activation device 10 is attempted to be attached to or detached from the retractor base 6 without noticing that the malfunction prevention mechanism 19 is in the released state, the lever member 23 is Since it interferes with the attaching / detaching operation by interfering with the mounting screw 5 which is the fastening means and the driver 4 which is the fastening tool, the starter 10 cannot be attached / detached, and the operator cannot operate the malfunction prevention mechanism 19 in the released state. You can tell that there is. The starting device 10 can be attached to and detached from the retractor base 6 only when the malfunction preventing mechanism 19 is in the set state as shown in FIG.

Therefore, it is possible to reliably prevent the assembling work and the removing work of the startup device 10 from being performed while the malfunction prevention mechanism 19 of the startup device 10 is released. It is possible to reliably prevent the inconvenience of the actuation of the activating device 10 due to an accidental impact during the attaching work or the removing work. FIG. 7 is a cross-sectional view of a starting device 30 according to a second embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals to simplify the description.

The malfunction prevention mechanism 33 of the starting device 30 according to the second embodiment includes a trigger case 31 between the bottom wall side end 16a of the annular permanent magnet 16 and the detonator side end 15b of the inertial body 15. The cross section octagonal shape is a control means that is penetrated into a hole 31d having an octagonal cross section that is provided so as to cross the upper part of the guide hole of the above, and that makes the inertial body 15 selectively in a movement blocking state and a movable state. Shaft 32.

The shaft 32 is integrally provided with a lever member 34 protruding outward in the radial direction at one end, and a snap action spring 35 having both ends supported at the other end is attached to the shaft 32 in a predetermined range. It is movable in the axial direction. Further, since the contact surface 32b facing the inertial body 15 is formed in the intermediate portion of the shaft 32 corresponding to the guide hole of the trigger case 31, it can be in a state of not interfering with the inertial body 15. The arcuate notch 32a is formed.

Therefore, when the malfunction prevention mechanism 33 is set, the shaft 32 is held at the position shown in FIG. 7 by the urging force of the snap action spring 35, and the contact surface 32 b of the shaft 32 is held. Faces the upper part of the detonator side end 15 b of the inertial body 15. Therefore, the inertial body 15 and the shaft 32 interfere with each other, and the inertial body 15 is in a movement blocking state in which the movement in the detonator direction is blocked, and the ignition pin 13 also moves in the detonator direction relative to the inertial body 15. The activation device 30 is inoperable because it cannot move.

When releasing the malfunction prevention mechanism 33, the shaft 32 is moved in the axial direction (left direction in the figure) against the biasing force of the snap action spring 35. Then, the urging direction of the snap action spring 35 is reversed, the shaft 32 is urged to the left in the drawing, and the notch 32a corresponds to the guide hole of the trigger case 31 and interferes with the inertial body 15. Since the position is not set, the inertial body 15 is in a movable state capable of moving in the detonating direction, and the starter 30 is in an operable state.

The trigger case 31 has two screw insertion holes 31g and 31h in the flange portion 31f. These screw insertion holes 31g and 31h are inserted into a mounting screw 5 which is a fastening means for mounting the trigger case 31 on the side wall of the retractor base 6, and are integrally formed with the side wall of the retractor base 6 and the flange portion of the housing 9b. It is concluded.

The lever member 34, which is a part of the shaft 32, is a plate-like piece that projects outward in the radial direction from one end of the shaft 32, and moves together with the shaft 32. When the shaft 32 is set in a state of interfering with the inertial body 15, the lever member 34 is not located on the fastening locus of the mounting screw 5 that is inserted into the screw insertion hole 31g. As shown, it is located at a position where it does not hinder the work of inserting and fastening the mounting screw 5. Further, when the shaft 32 is set in a state where it does not interfere with the inertial body 15, it is located on the fastening locus of the mounting screw 5 inserted through the screw insertion hole 31g, and as shown by the two-dot chain line in FIG. The lever member 34 is held at a position where it interferes with the mounting screw 5 and the driver 4 so that the screw 5 cannot be attached or detached.

Therefore, also with the activation device 30 of the second embodiment, it is possible to obtain the same operational effect as in the case of the first embodiment. In each of the above-described embodiments, the case where the starter is installed in the seat belt tightening device (pretensioner) has been described as an example. However, the starter with the malfunction prevention mechanism according to the present invention is an airbag device or the like. Of course, the structure of the starting device can take various forms as long as it is a mechanical starting device having an inertial body.

Further, in each of the above-mentioned embodiments, only one of the two mounting screws, which is the fastening means for attaching the trigger case to the side wall of the retractor base, is the shaft which is the regulating means. Although a part (lever member) of the shaft is located on the fastening track of the mounting screw, a part of the shaft may be located on the mounting track of the mounting screw for both mounting screws. . Further, the number of mounting screws as fastening means is not limited to the number in the above embodiment, and when a plurality of mounting screws are provided, at least one or more of the mounting screws is a shaft. It suffices to configure so that a part thereof can be located on the fastening locus of the mounting screw.

Further, the lever member that blocks the attachment / detachment operation of the fastening means when the malfunction prevention mechanism is released moves along the fastening locus in conjunction with the operation of the regulating means, and the fastening means is inserted and fastened. However, the shape and size are not limited to those in the above-mentioned embodiments. Further, the fastening means for fixing the starting device to the assembly (retractor base) is not limited to the mounting screws shown in the above embodiments, and other fastening means such as a rivet may be used. .

[0042]

[Effect of device]

 According to the actuating device of the present invention, when the restricting means, which is a malfunction preventing mechanism of the actuating device, makes the inertial body movable, a part of the restricting means is positioned on the fastening locus of the fastening means, The activation device cannot be attached to or detached from the assembly of the seat belt tightening device or the airbag device because it interferes with a member or a fastening tool. On the other hand, when the restricting means is in the movement blocking state of the inertial body, a part of the restricting means is not located on the fastening locus of the fastening means and does not interfere with each other. It can be attached to and detached from the assembly of the bag device.

Therefore, even if one tries to attach / detach the starter to / from the assembly without noticing that the malfunction preventing mechanism is in the released state in which the inertial body can be moved, one part of the regulating means is the fastening means and the fastening means. Since the starter cannot be attached or detached because it interferes with the fastening tool and interferes with the attachment / detachment operation, the operator is informed that the malfunction prevention mechanism is in the released state. It is possible to reliably prevent the occurrence of the inconvenience that the starter is operated due to an accidental impact.

Therefore, a detachment work is not performed when the starter is in an operable state, and a malfunction preventive mechanism with good assemblability that can reliably and easily prevent a malfunction of the starter is provided. It is possible to provide a starting device provided with the device.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a starter including a malfunction prevention mechanism according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of the starting device shown in FIG.

FIG. 3 is a top view of the activation device shown in FIG.

FIG. 4 is a front view showing an assembly of a retractor with a pretensioner that incorporates the activation device shown in FIG.

5 is a side view showing an assembly of the retractor with pretensioner shown in FIG. 4. FIG.

FIG. 6 is a vertical cross-sectional view illustrating the operation of the malfunction prevention mechanism shown in FIG.

FIG. 7 is a cross-sectional view of a starter including a malfunction prevention mechanism according to a second embodiment of the present invention.

[Explanation of symbols]

 4 Driver 5 Mounting Screw (Fastening Means) 6 Retractor Base 9 Drive Means 10 Starter 12 Gas Generator 12c Detonator 13 Ignition Pin 15 Inertia 16 Annular Permanent Magnet 17 Trigger Case 17d Hole 17g Screw Insertion Hole 18 Shaft 18a Notch Part 19 Malfunction prevention mechanism 20 Spring pin 21 Positioning groove 22 Compression coil spring 23 Lever member

Claims (1)

[Scope of utility model registration request] 1. A seat belt tightening device that senses a vehicle collision by utilizing the operation of an inertial body that is displaced by an inertial force when the vehicle collides, and applies tension to the webbing to remove the slack of the seat belt, or an occupant. A starting device for actuating an airbag device for rapidly inflating an airbag with gas in order to protect the vehicle from the impact of a collision, the starting device being attached to the seat belt tightening device or the assembly of the airbag device. And a restricting means that is disposed in the starting device to selectively bring the inertial body into a movement blocking state or a movable state,
A part of the restricting means moved to a position where the inertial body can be moved is positioned on a fastening locus of the fastening means so as to prevent attachment / detachment operation of the fastening means. A starting device characterized by.