JPH0948320A - Safety structure for mechanical ignition type sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety structure for a mechanical ignition type sensor capable of being switched to a forced operation only when the mechanical ignition type sensor is forcibly operated intentionally. SOLUTION: A screw case 78 formed with the second guide groove 82 is fitted to the bracket 70 of an air bag device 12, and an operating rod 86 operating the switching lever 56 of a mechanical ignition type sensor 10 is normally guided by the second guide groove 82 and moved. The operating rod 86 is not moved in the direction forcibly operating the mechanical ignition type sensor 10, and the inadvertent forced operation of the mechanical ignition type sensor 10 can be prevented. When the mechanical ignition type sensor 10 is to be forcibly operated, the screw case 78 is removed, and the screw case 78 is moved together with the operating rod 86. The operating rod 86 is moved without being guided by the second guide groove 82, and the mechanical ignition type sensor 10 can be forcibly operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety structure for a mechanical ignition type sensor used in an occupant protection device such as an airbag device and a pretensioner device.

[0002]

2. Description of the Related Art An occupant protection device, for example, an airbag device for a driver seat mounted on a vehicle is equipped with a mechanical ignition type sensor that senses a sudden deceleration state of the vehicle and activates the airbag device. .

This mechanical ignition type sensor is usually arranged at the axial center of an inflator of an air bag device, and internally has an ignition pin that collides with a detonator by an urging force to ignite the detonator, and this ignition pin. A trigger lever to be held, an inertial mass body that maintains the ignition pin holding state of the trigger lever, and inertially moves by an inertial force due to rapid deceleration of the vehicle to release the ignition pin holding state of the trigger lever, and the like are housed.

When the vehicle decelerates rapidly, the inertial mass moves inertially, and when the ignition pin holding state is released, the ignition pin collides with the detonator by the biasing force to ignite the detonator, and the gas generating agent contained in the inflator is ignited. This is a configuration in which a large amount of gas is generated by burning and the bag body provided in the airbag device is inflated toward the occupant.

Further, such a mechanical ignition type sensor is provided with a safety device for preventing malfunction during assembly and the like. This safety device is equipped with a switching lever that engages with the inertial mass body that is moved by inertial force and blocks the movement thereof regardless of the action of the inertial force. When the switching lever is engaged with the inertial mass body, the movement of the inertial mass body is forcibly prevented as described above, so that even if an external force is applied unnecessarily when the vehicle is assembled, etc. ,
The malfunction of the sensor is prevented.

By the way, when disposing of a vehicle equipped with the above-described airbag device, it is desirable to forcibly operate the airbag device before the vehicle body is crushed from the viewpoint of safety. In addition, from the viewpoint of safety and the reduction of work effort, it is rational to perform this work with the airbag device attached to the steering wheel.

Therefore, in the mechanical ignition sensor, apart from the state in which the switching lever is engaged with the inertial mass body to prevent the movement of the inertial mass body and the state in which the switching lever is separated from the inertial mass body, By further operating the switching lever, the inertial mass body is forcibly moved in the same direction as the inertial movement at the time of sudden deceleration of the vehicle, and the sensor is forcibly ignited.

In this mechanical ignition type forced activation device, when a vehicle equipped with the above-described airbag device is scrapped, an operator operates the switching lever from the outside to force the sensor to be ignited easily. The airbag device can be forced to operate.

On the other hand, in such a mechanical ignition type forced activation device for a sensor, although the sensor can be easily ignited by operating the switching lever from the outside, the airbag device is truly forcibly activated. The switching lever should not be moved to the sensor forced ignition position except when the operation is performed, and thus the operator is required to perform careful work.

[0010]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention provides a safety structure for a mechanical ignition sensor capable of switching to the forced operation only when the mechanical ignition sensor is intentionally forcibly activated. The purpose is to obtain.

[0011]

A safety structure of a mechanical ignition type sensor according to claim 1 is provided corresponding to an occupant protection device and is ignited by an inertial force when a predetermined load is applied to operate the occupant protection device. Also applied to a mechanical ignition type sensor equipped with a switching lever that is moved by an external operation by an operating rod, and a mechanical ignition type sensor that is in an operation blocking state, an operable state, and a forced ignition depending on the movement of the switching lever. A structure, which is normally attached integrally to the occupant protection device, and engages the operating rod in the operable state of the mechanical ignition sensor to move the operating rod in the switching lever operating direction. How to operate the switching lever of the operating rod by restricting and releasing the attached state and separating from the occupant protection device to release the movement restricted state The movement restriction member that allows movement of the is characterized in that it comprises.

In the safety structure of the mechanical ignition type sensor according to the first aspect, when the switching lever is operated from the outside by the operating rod, the mechanical ignition type sensor is switched to the operation blocking state, the operable state or forced. Is ignited.

Here, when the operation ignition of the mechanical ignition type sensor by the switching lever is blocked, the operation rod is engaged with the movement restricting member integrally attached to the occupant protection device, and the operation rod moves in the switching lever operating direction. Movement is restricted. Therefore, even if the operating rod is inadvertently operated in this state, the switching lever does not move in the direction for forcibly igniting the mechanical ignition sensor.

On the other hand, when the mechanical ignition sensor is forcibly ignited, the movement restricting member is removed from the occupant protection device and moved in the direction in which it is separated from the occupant protection device. The operation rod can be moved in the operation direction of the switching lever. Therefore,
In this state, the mechanical ignition sensor can be forcibly operated by moving the operating rod in the switching lever operating direction.

According to a second aspect of the present invention, there is provided a safety structure for a mechanical ignition type sensor, which is provided corresponding to an occupant protection device to ignite by an inertial force when a predetermined load is applied to operate the occupant protection device and from outside by an operating rod. Applied to mechanical ignition type sensor equipped with a switching lever that moves by the operation of
A safety structure of a mechanical ignition type sensor that performs an operation blocked state, an operable state, and a forced ignition according to the movement of the switching lever, and is normally arranged detachably between the occupant protection device and the operation rod. In the operable state of the mechanical ignition sensor, the movement of the operating rod in the switching lever operating direction is restricted by coming into contact with the operating rod, and the movement restricted state is released by being separated from the arrangement position. Then, a movement limiting member that enables the operation rod to move in the switching lever operating direction is provided.

According to a second aspect of the present invention, there is provided a safety structure for a mechanical ignition type sensor, wherein the movement limiting member is detachably arranged between the occupant protection device and the operating rod when the mechanical ignition type sensor is in the operation blocking state by the switching lever. The operation rod is brought into contact with the operation rod, and the movement of the operation rod in the operation direction of the switching lever is restricted. Therefore, even if the operating rod is inadvertently operated in this state, the switching lever does not move in the direction for forcibly igniting the mechanical ignition sensor.

On the other hand, when the mechanical ignition sensor is forcibly ignited, the movement restricting member is removed from the predetermined position to release the movement restricting state of the operating rod, and the operating rod is moved in the switching lever operating direction. Is possible. Therefore, by moving the operating rod in the switching lever operating direction in this state, the mechanical ignition sensor can be forcibly activated.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment to which the present invention is applied.
The front view of the principal part of the mechanical ignition type sensor 10 and the airbag apparatus 12 as an occupant protection device equipped with the mechanical ignition type sensor 10 according to the embodiment of the present invention is shown. Further, FIG. 2 shows a plan view corresponding to FIG.

The airbag device 12 is provided with a base plate 14. In this base plate 14,
A bag body, an air bag cover and the like (all not shown) are attached, and an inflator 16 is further attached. The inflator 16 is formed in a cylindrical shape,
The base plate 14 is arranged so as to penetrate substantially the center of the base plate 14, and is fixed to the base plate 14 with a bolt (not shown). The inflator 16 is provided with the mechanical ignition type sensor 10.

The mechanical ignition sensor 10 has a cylindrical case 20 having a bottom wall 18, as shown in FIG. A plate 22 is arranged on the opening side of the case 20, and the opening side is sealed by a cover 24. Further, a through hole 26 is formed on the bottom wall 18 of the case 20 on the axis, and a cylindrical guide hole 28 is formed inside the case 20.

An ignition pin 30 is arranged inside the case 20. The ignition pin 30 is composed of a main body 32 formed in a substantially cylindrical shape and a convex portion 36 integrally formed to project from a bottom wall 34 of the main body 32, and slides in the case 20 along the axis. It is supposed to be movable. By sliding the ignition pin 30 in the direction of the bottom wall 18 (the direction opposite to the arrow A in FIG. 7), the convex portion 36 can enter the through hole 26 formed in the bottom wall 18, and the ignition is performed. When the main body 32 of the pin 30 moves to the side closest to the bottom wall 18 of the case 20, the convex portion 36 projects from the through hole 26 to the outside.

A firing spring 38 is arranged between the ignition pin 30 and the plate 22.
One end of the firing spring 38 is locked by the plate 22, and the ignition pin 30 is always inserted in the through hole 26.
Is biased in the direction of.

Further, the case 20 includes an inertial mass body 40.
Is arranged. The inertial mass body 40 is formed in a substantially cylindrical shape and is movable along the guide hole 28 in the axial direction. A release hole 42 is formed on the peripheral surface of the inertial mass body 40.
Further, an opening 44 that is long in the axial direction is formed on the peripheral surface opposite to the release hole 42.

A bias spring 46 is arranged between the inertial mass body 40 and the plate 22 to constantly urge the inertial mass body 40 toward the bottom wall 18.

A trigger lever 48, which is long in the axial direction, is arranged between the inertial mass body 40 and the ignition pin 30. The trigger lever 48 has a shaft 50 at one end in the longitudinal direction.
It is rotatably supported by. Further, an engaging portion 52 that projects toward the ignition pin 30 is formed at the tip of the trigger lever 48. The engagement portion 52 approaches or separates from the ignition pin 30 as the trigger lever 48 rotates about the shaft 50. When the engaging portion 52 is close to the ignition pin 30, the engaging portion 52 engages with the main body 32 of the ignition pin 30 so that the protrusion 36 of the ignition pin 30 penetrates the through hole 2.
It is held in the state of being pulled out from 6.

Further, a slide holding portion 54 is formed so as to project toward the inertial mass body 40 on the opposite side of the engaging portion 52 near the tip end portion of the trigger lever 48. The slide holding portion 54 corresponds to the release hole 42 formed in the inertial mass body 40. When the release hole 42 faces the slide holding portion 54, the slide holding portion 54 enters the release hole 42. is there. That is, normally, the inertial mass 40 is moved most by the bias spring 46 into the bottom wall 18 of the case 20.
The slide holding portion 54 is in contact with the inner peripheral surface of the inertial mass body 40 in this state. When the inertial mass body 40 moves in the direction of the anti-bottom wall 18 (direction of arrow A in FIG. 7), the inertial mass body 40 relatively moves while contacting the slide holding portion 54 of the trigger lever 48, and the slide holding portion 54 releases the slide hole. It is a configuration that enters 42.

On the other hand, a switching lever 56 is arranged on the side of the plate 22 opposite to the bottom wall 18. Switching lever 56
A disk portion 58 is formed at the end portion on the bottom wall 18 side.
A conical coil spring 60 is arranged between the disc portion 58 and the cover 24, and the disc portion 58 (that is, the switching lever 56) is always placed in the direction of the bottom wall 18 (counter arrow A in FIG. 7).
Direction). An arm portion 62 is formed on a part of the peripheral surface of the disk portion 58. The arm portion 62 penetrates the plate 22 and extends toward the bottom wall 18, and has a locking portion 64 that is bent at a substantially right angle at the tip. The locking portion 64 is fitted in the opening 44 of the inertial mass body 40, and moves in the opening 44 when the switching lever 56 moves in the axial direction. Here, this locking portion 6
When 4 is close to the end of the opening 44 on the bottom wall 18 side, the locking portion 64 blocks the movement of the inertial mass body 40, and the locking portion 64 is different from the bottom wall 18 of the opening 44. The inertial mass body 40 can be moved by moving until it approaches the opposite end. Further, the locking portion 64 is provided on the bottom wall 1 of the opening 44.
8, the engaging portion 64 moves toward the anti-bottom wall 18 in a state where it is in contact with the end portion on the opposite side to the inertial mass body 40.
Can be moved in any direction.

That is, by appropriately moving the switching lever 56, the mechanical ignition sensor 10 can be switched between the operation blocking state and the operable state, and can be forcibly operated.

The end portion of the switching lever 56 opposite to the bottom wall 18 projects outside the cover 24, and a disc portion 66 is fixed to the tip thereof. As a result, the switching lever 56 can be operated from the outside.

The mechanical ignition type sensor 10 having the above-mentioned structure is arranged near the axis of the inflator 16, and a detonator 68 is arranged inside the inflator 16 adjacent to the mechanical ignition type sensor 10. The detonator 68 is arranged so as to face the through hole 26 of the case 20 of the mechanical ignition sensor 10, and is ignited by the convex portion 36 of the ignition pin 30 protruding from the case 20 to burn a gas generating agent (not shown). Is.

On the other hand, the lower portion 14A of the base plate 14 formed on the side of the inflator 16 corresponds to the bracket 70 and is attached to the bracket 70 by the bolt 72.

The bracket 70 is formed in an L shape as viewed from the front, and a concave portion 74 is formed in a connecting portion between the vertical wall 70A and the bottom wall 70B of the bracket 70 so as to face the side opposite to the mechanical ignition sensor 10. Are formed. Also, the bottom wall 70B
A first guide groove 76 is formed continuously from the end of the recess 74 on the mechanical ignition sensor 10 side. The first guide groove 76 is formed by extending the center line of the mechanical ignition sensor 10.
Is formed so that the switching lever 56 is positioned.

On the other hand, on the side of the vertical wall 70A of the bracket 70, a screw case 78 as a movement limiting member is arranged. The screw case 78 is made of resin and is detachably attached to the side surface of the vertical wall 70A opposite to the mechanical ignition type sensor 10 by a bolt 80. Also, the screw case 78 includes a bracket 7
A bottom wall 78B is formed corresponding to the bottom wall 70B of 0. The bottom wall 78 </ b> B is formed so as to fit in the recess 74 of the bracket 70 with the screw case 78 attached to the bracket 70. Further, the first guide groove 76 of the bracket 70 is provided on the bottom wall 78B.
A second guide groove 82 is formed corresponding to the. The second guide groove 82 is formed so as to be continuous with the first guide groove 76 with the bottom wall 78B fitted in the recess 74. Further, the second guide groove 82 is provided so as to be inclined with respect to the center line of the first guide groove 76 in a plan view, whereby the first guide groove 76 and the second guide groove 8 are provided.
2 is bent continuously in a substantially L shape in a plan view and is continuously provided. Also, the screw case 78
A pair of locking claws 84 facing each other are formed near the head of the bolt 72. These locking claws 84 have a predetermined elasticity and can be elastically deformed in a direction of coming in contact with and separating from each other.

The first guide groove 76 of the bracket 70 is also used.
An operation rod 86 is movably attached to the second guide groove 82 of the screw case 78. The operating rod 86 is made of resin and is formed in a long shape as a whole. A pair of guide pins 88 and 90 are provided at a middle portion in a longitudinal direction, and a connecting plate 92 is provided at tips of the guide pins 88 and 90. ing. These guide pins 88 and 90 are provided in the first guide groove 76 of the bracket 70 and the screw case 7.
The second guide groove 82 of No. 8 is movably inserted,
As a result, the operating rod 86 moves the guide pins 88, 9
0 is movable while being guided by the first guide groove 76 and the second guide groove 82. In this case, one guide pin 88 moves only in the first guide groove 76, and the other guide pin 90 moves from the second guide groove 82 to the first guide groove 76.
Move between. Therefore, the operating rod 86 does not face the switching lever 56 of the mechanical ignition sensor 10 when the guide pin 90 is located in the second guide groove 82, and the operating rod 86 is located when the guide pin 90 is located in the first guide groove 76. 86 is a structure facing the switching lever 56.

Further, a releasing portion 94 is formed at the tip of the operation rod 86 on the mechanical ignition type sensor 10 side so as to correspond to the switching lever 56. The release portion 94 is formed in a U-shape in plan view, and the thickness of the release portion 94 is such that the engagement portion 64 of the switching lever 56 extends from the end portion of the inertial mass body 40 on the side of the bottom wall 18 to the side opposite to the bottom wall 18. It corresponds to the distance to move to the department. That is, the U-shaped portion of the release portion 94 sandwiches the switching lever 56 so that the cover 24 of the mechanical ignition type sensor 10 is sandwiched.
And the disc portion 66, the release portion 94
The switching lever 56 is pulled out in the axial direction by a length corresponding to the thickness of the.

Further, a longitudinal arm portion 96 is continuously formed at one end of the releasing portion 94 in the longitudinal direction of the operating rod 86, and the releasing portion 94 is provided at the distal end of the releasing portion 94. A forced operating portion 98 is formed so as to face 94. The forced operating portion 98 is formed in a U shape in plan view,
The thickness is such that the locking portion 64 of the switching lever 56 abuts from the end portion of the inertial mass body 40 on the bottom wall 18 side to the end portion on the side opposite to the bottom wall 18 and further presses the inertial mass body 40. It corresponds to the distance that the mechanical ignition sensor 10 moves to a position where it is forcibly activated. That is, the U-shaped portion of the compulsory operating portion 98 sandwiches the switching lever 56 so that the mechanical ignition type sensor 10
By being inserted between the cover 24 and the disc portion 66, the switching lever 56 is pulled out in the axial direction by the length corresponding to the thickness of the forced operating portion 98.

On the other hand, the vertical wall 10 is provided at the rear end of the operating rod 86.
0 is provided. This vertical wall 100 includes the operation rod 8
6 extends substantially at right angles to the longitudinal direction of the vertical rod 6, and when the release portion 94 of the operating rod 86 enters between the disc portion 66 of the mechanical ignition sensor 10 and the cover 24, the vertical wall 1
00 and the vertical wall portion 78A of the screw case 78 are in contact with each other. Further, the vertical wall 100 is formed with an engaging portion 102 having a U-shape in a plan view. The engaging portion 102 can be fitted to the locking claw 84, and the vertical wall 6
When 0 contacts the vertical wall portion 78A of the screw case 78, the engaging portion 102 is engaged with the locking claw 84.

Next, the operation of the present embodiment will be described. In the mechanical ignition sensor 10 and the airbag device 12 having the above-described configurations, as shown in FIGS. 1 and 2, the disc portion 66 of the switching lever 56 is attached to the axial center portion of the inflator 16 in a state of being closest to the cover 24. To be

In this state, the conical coil spring 60
The disc portion 58 (switching lever 56) is maintained in the state of being closest to the plate 22 by the urging force of the engaging portion 64, and the locking portion 64 is located at the end of the opening 44 of the inertial mass body 40 on the bottom wall 18 side. Maintained in close proximity. This allows
The inertial mass body 40 is in the direction of the counter bottom wall 18 (direction of arrow A in FIG. 7).
The movement to the is blocked by the locking portion 64. Therefore, in this state, the slide holding portion 54 of the trigger lever 48 does not enter the release hole 42, and the ignition pin holding state by the trigger lever 48 is not released.

Here, when the operation-blocking state of the mechanical ignition type sensor 10 is released to bring it into the operable state, that is, when the safety device is released, the operating rod 86 is moved toward the mechanical ignition type sensor 10 (see FIG. 1). In the direction of arrow B).
The guide pin 88 of the operation rod 86 pushed in is first
The guide pin 90 moves while being guided by the guide groove 76, and moves to the first guide groove 76 while being guided by the second guide groove 82. As a result, the release portion 94 faces the switching lever 56, and the arm portion 96 further approaches the switching lever 56. When the operating rod 86 is further moved in this state, the releasing portion 94 sandwiches the switching lever 56 and enters between the cover 24 and the disk portion 66 of the mechanical ignition sensor 10, and the switching lever 56 is pulled out in the axial direction. (State shown in FIGS. 3 and 4). As a result, the switching lever 5
The engaging portion 64 of 6 moves to the side of the bottom wall 18 of the opening 44 of the inertial mass body 40, and the movement of the inertial mass body 40 in the direction of the bottom wall 18 (direction of arrow A in FIG. 7) becomes possible. The mechanical ignition sensor 10 is set in an operable state. Further, in this state, the arm portion 96 of the operating rod 86 is closest to the switching lever 56, and the U-shaped portion of the forced operating portion 98 faces the switching lever 56.
The vertical wall 100 of 6 is the vertical wall portion 78A of the screw case 78.
And the engaging portion 102 is fitted into the locking claw 84.

When a load larger than a predetermined magnitude is applied to the mechanical ignition type sensor 10 in the sensor operable state, the inertial mass causes the inertial mass body 40 to inertially move toward the counter bottom wall 18. The movement of the inertial mass body 40 causes the slide holding portion 54 of the trigger lever 48 to move.
When facing the release hole 42, the trigger lever 48 urged by the firing spring 38 via the ignition pin 30 is rotated in the direction away from the ignition pin 30, and the engagement portion 52 of the trigger lever 48 is ignited. Body 32 of pin 30
And the ignition pin holding state is released. As a result, the firing pin 30 is moved in the direction of the through hole 26 (the direction opposite to the arrow A in FIG. 7) by the urging force of the firing spring 38, and the projection 36 of the ignition pin 30 projects outward from the through hole 26. Collide with the detonator 68 to ignite the detonator 68 and operate the airbag device 12.

Here, when the operation rod 86 is pulled in the sensor operable state (safety device released state), the operation rod 86 moves along the trajectory when the operation blocked state is changed to the safety device released state. Going backwards, FIG. 1 and FIG.
The operation-inhibited state shown in FIG. That is, the pulled operation rod 86 moves to the second guide groove 82 while the guide pin 90 is guided by the first guide groove 76, and moves while the guide pin 88 is guided to the first guide groove 76. The releasing portion 94 of the operating rod 86 is separated from the disc portion 66. As a result, the mechanical ignition type sensor 1
0 is again in the blocking state. In this case, the arm portion 96 moves in the direction away from the switching lever 56, and the forced operating portion 9 moves.
The U-shaped portion of 8 is changed from the state where it faces the switching lever 56 to the state where it does not face it. Therefore, even if the operating rod 86 is inadvertently pulled, the forced operating portion 98 does not engage with the switching lever 56. The switching lever 56 is not further pulled out from the safety device released state. Further, when releasing the safety device, the operator does not mount the vertical wall 100 on the screw case 7.
Since the operation rod 86 only has to be pushed until it comes into contact with the vertical wall portion 78A of 8 and the engagement portion 65 is fitted into the locking claw 84, excessively careful work is not required.

Next, when the mechanical ignition type sensor 10 is forcibly activated, it can be carried out by releasing the movement restricted state of the operating rod 86 and operating the switching lever 56 by the operating rod 86. That is, the bolt 80
Is released to release the fixed state of the screw case 78, so that the screw case 78 can be moved. In this state, screw the screw case 78 together with the operating rod 86 in the direction of the anti-mechanical ignition type sensor 10 (counter arrow B in FIGS.
Direction), the bottom wall 78 of the screw case 78
B is separated from the recess 74 of the bracket 70, and the second guide groove 82 is separated from the first guide groove 76. In this state, the guide pin 90 of the operating rod 86 has the second guide groove 8
It does not enter 2 and moves on the extension of the first guide groove 76. As a result, the forced operating portion 98 of the operating rod 86 approaches the switching lever 56 while facing the switching lever 56. When the operation rod 86 and the screw case 78 are further pulled in this state, the forcibly operating portion 98 causes the switching lever 56 to move.
The cover 2 of the mechanical ignition type sensor 10 so as to sandwich it.
4 and the disk portion 66, and the switching lever 56 is pulled out in the axial direction (state shown in FIGS. 5 and 6). As a result, the inertial mass body 40 is moved in the same direction as the inertial movement (direction of arrow A in FIG. 7) by the locking portion 64 of the switching lever 56, and the slide holding portion 54 of the trigger lever 48 is moved to the inertial mass body 40. When facing the release hole 42, the ignition pin holding state is released, and the ignition pin 30 is moved toward the through hole 26 by the urging force of the firing spring 38.
In the moved ignition pin 30, the convex portion 36 projects outward from the through hole 26 and collides with the detonator 68, ignites the detonator 68 and operates the airbag device 12.

As described above, in the mechanical ignition type sensor 10 and the airbag device 12 having the above-mentioned configurations, the screw case 78 is released from the fixed state and the screw case 78 is released.
As long as the operating rod 86 is not operated, the mechanical ignition sensor 10 is switched to either the operation blocking state or the operable state (safety device release state) even if the operating rod 86 is operated. Type sensor 1
0 is never activated. Therefore, it is possible to prevent the mechanical ignition sensor 10 from malfunctioning due to careless operation. Further, when the mechanical ignition type sensor 10 is set to the operable state (safety device released state), the worker does not touch the vertical wall 10
Since 0 only contacts the vertical wall portion 78A of the screw case 78 and the engaging portion 65 fits into the locking claw 84, the operating rod 86 may be simply pushed in, so that excessively careful work is not required. .

Next, a second embodiment of the present invention will be described. It should be noted that parts that are basically the same as those in the first embodiment are given the same reference numerals as in the first embodiment, and description thereof will be omitted.

FIG. 8 shows a front view of the airbag device 120 according to the second embodiment. An operation rod 122 is movably attached to the first guide groove 76 of the bracket 70 and the second guide groove 82 of the screw case 78 of the airbag device 120. The operation rod 122 is a long resin molded product as a whole, and an engaging portion 124 having a substantially U shape in a plan view is formed at the tip thereof. The engaging portion 124 corresponds to the operating lever 74 of the mechanical ignition sensor 10, and can be inserted between the cover 24 and the disc portion 66 so as to sandwich the operating lever 74.

A releasing portion 126 is provided at the tip of the engaging portion 124.
Are formed. The thickness of the release portion 126 is such that the engagement portion 64 of the switching lever 56 is the bottom wall 1 of the inertial mass body 40.
It corresponds to the distance moved from the end on the 8 side to the end on the opposite bottom wall 18 side. That is, the release portion 126 is inserted between the cover 24 and the disc portion 66 of the mechanical ignition type sensor 10 so that the release lever 126 is sandwiched between the release lever 126 and the release lever 126, and the switch lever 56 has a length corresponding to the thickness of the release portion 126. Is drawn out in the axial direction.

A forced actuating portion 128 is formed continuously at the rear end of the releasing portion 126. The thickness of the forced operating portion 128 is such that the locking portion 64 of the switching lever 56 abuts from the end portion of the inertial mass body 40 on the bottom wall 18 side to the end portion on the side opposite to the bottom wall 18, and further the inertial mass body 40. It corresponds to the distance of pressing to move the mechanical ignition sensor 10 to the position where it is forcibly activated. That is, the force actuating portion 128 sandwiches the switching lever 56 so that the cover 24 of the mechanical ignition sensor 10 is sandwiched.
It is configured such that the switch lever 56 is pulled out in the axial direction by a length corresponding to the wall thickness of the forced operating portion 128 by being inserted between the disk portion 66 and the disk portion 66.

On the other hand, the vertical wall portion 78 of the screw case 78
On the side of A, a spacer 130 as a movement restricting member is arranged. The spacer 130 is notched in a U shape at one end, is fitted to the operation rod 122, and is provided so as to come into contact with the side surface of the vertical wall portion 78A opposite to the mechanical ignition type sensor 10. . Further, the wall thickness of the spacer 130 is such that the release portion 126 of the operating rod 122 is inserted between the disc portion 66 of the mechanical ignition sensor 10 and the cover 24, and the force actuating portion 128 is the mechanical ignition sensor 1.
0 corresponds to the distance that the operating rod 122 moves to a state where it is inserted between the disk portion 66 and the cover 24, and the release portion 126 is inserted between the disk portion 66 and the cover 24 of the mechanical ignition sensor 10. The operating rod 122
The vertical wall 100 is in contact with the spacer 130.

Next, the operation of this embodiment will be described. In the airbag device 120 having the above configuration, as shown in FIG. 6, the mechanical ignition sensor 10 is attached to the axial core portion of the inflator 16 with the operation lever 74 positioned at the initial position. In this state, the operation of the mechanical ignition type sensor 10 is blocked as in the first embodiment.

Here, in order to release the operation-inhibited state of the mechanical ignition type sensor 10 to make it operable, the operating rod 122 is moved in the direction of the mechanical ignition type sensor 10 (direction of arrow B in FIGS. 8 and 9). Push in and pull out the switching lever 56 in the axial direction (direction of arrow A in FIG. 8). Further, when the operation rod 122 is moved until the releasing portion 126 reaches the disc portion 66 (state shown in FIG. 10), the locking portion 64 of the switching lever 56 is moved to the side of the opening 44 of the inertial mass body 40 opposite to the bottom wall 18 side. The inertial mass body 40 is moved, and the inertial mass body 40 can be moved toward the opposite bottom wall 18. As a result, the mechanical ignition sensor 10 is brought into an operable state. Further, in the sensor operable state (safety device released state), the operation rod 122 is placed on the vertical wall 100.
Is in contact with the spacer 130.

When a load of a predetermined magnitude or more is applied to the mechanical ignition type sensor 10 in the sensor operable state, the mechanical ignition type sensor 10 is activated and the air bag device 120 is activated, as in the first embodiment. Operate.

As described above, in the operable state of the mechanical ignition type sensor 10, the operation rod 122 is
Since the vertical wall 100 of the above is in contact with the spacer 130, movement in the direction of the mechanical ignition sensor 10 (direction of arrow B in FIG. 7) is prevented. Therefore, the operation rod 122 is not pushed further from this state by an inadvertent operation,
Unnecessary movement of the switching lever 56 can be prevented.
In addition, in the above work, the operator operates the operation rod 122.
Since the operation rod 122 only has to be pushed until the vertical wall 100 comes into contact with the spacer 130, excessively careful work is not required.

Next, when the mechanical ignition sensor 10 is forcibly activated, it can be carried out by releasing the movement restricted state of the operating rod 122 and operating the switching lever 56 by the operating rod 122. That is,
Vertical wall 132 of operation rod 122 and screw case 78
By removing the spacer 130 between the vertical walls 28A, the operation rod 122 can be moved toward the mechanical ignition sensor 10. When the operation rod 122 is further moved in this state, the switching lever 56 is further pulled out. Further, the operation rod 1 is operated until the forced operating portion 128 reaches the disc portion 66.
22 is moved (state shown in FIG. 11), inertial mass body 4
0 is pressed by the locking portion 64 of the switching lever 56,
It is moved in the same direction as the inertial movement. As a result, as in the first embodiment of the previous term, the mechanical ignition type sensor 10 operates to operate the airbag device 120.

As described above, in the mechanical ignition sensor 10 and the air bag device 11 having the above-described configurations, the vertical wall portion 64A of the vertical wall 100 of the operating rod 122 is the spacer 130 when the mechanical ignition sensor 10 is operable. Since it is in contact with the sensor, the movement from this position toward the mechanical ignition type sensor 10 is blocked. For this reason, the operating rod 122 is not pushed further by an inadvertent operation by the operator, the operable state of the mechanical ignition type sensor 10 (safety device released state) can be maintained, and the mechanical ignition type sensor 10 is not forcibly forced. The operation can be prevented. Further, when the mechanical ignition sensor 10 is set in the operable state, the operator simply pushes the operating rod 122 until the vertical wall 100 of the operating rod 122 contacts the spacer 130.
It does not require excessively careful work.

In the present embodiment, the spacer 1 is simply used.
Since the movement restricted state of the operation rod 122 is released only by removing 30, the working efficiency can be improved without requiring a special tool or jig.

[0057]

As described above, in the safety structure of the mechanical ignition type sensor according to the present invention, the movement restricting member restricts the movement of the operation rod in the operation direction of the switching lever, so that the mechanical ignition is caused by the careless operation. It is possible to prevent malfunction of the sensor.

[Brief description of drawings]

FIG. 1 is a front view showing a safety structure of a mechanical ignition type sensor according to a first embodiment of the present invention.

FIG. 2 is a plan view corresponding to FIG.

FIG. 3 is a front view showing an operable state of the mechanical ignition sensor corresponding to FIG.

FIG. 4 is a plan view corresponding to FIG.

5 is a diagram showing a state in which the mechanical ignition type sensor corresponding to FIG. 1 is forcibly operated.

FIG. 6 is a plan view corresponding to FIG.

7 is a cross-sectional view of the mechanical ignition type sensor shown in FIG.

FIG. 8 is a front view showing a safety structure of a mechanical ignition type sensor according to a second embodiment of the present invention.

9 is a plan view corresponding to FIG. 8. FIG.

10 is a diagram showing an operable state of the mechanical ignition type sensor corresponding to FIG.

11 is a diagram showing a state in which the mechanical ignition type sensor corresponding to FIG. 8 is forcibly operated.

[Explanation of symbols]

 10 Mechanical Ignition Sensor 12 Airbag Device (Passenger Protection Device) 56 Switching Lever 78 Screw Case (Movement Restriction Member) 86 Operation Rod 120 Airbag Device (Passenger Protection Device) 122 Operation Rod 130 Spacer (Movement Restriction Member)

Claims (2)

[Claims] 1. A mechanical ignition equipped with a switching lever that is provided corresponding to an occupant protection device and that is activated by inertial force when a predetermined load is applied to activate the occupant protection device and that is moved by an external operation of an operating rod. Applied to the sensor, the operation is blocked according to the movement of the switching lever,
A safety structure for a mechanical ignition sensor that is in an operable state and forcibly ignited, and is normally attached integrally to the occupant protection device, and is engaged with the operation rod when the mechanical ignition sensor is in an operable state. Restricting the movement of the operating rod in the switching lever operating direction, releasing the attached state and separating from the occupant protection device, thereby releasing the movement limited state and moving the operating rod in the switching lever operating direction. A safety structure for a mechanical ignition type sensor, which is provided with a movement restricting member that enables movement to a position. 2. A mechanical ignition equipped with a switching lever which is provided corresponding to an occupant protection device and which is activated by inertial force when a predetermined load is applied to operate the occupant protection device and which is moved by an operation from the outside by an operating rod. Applied to the sensor, the operation is blocked according to the movement of the switching lever,
A safety structure for a mechanical ignition sensor that is operable and forcibly ignited, and is normally arranged detachably between the occupant protection device and the operation rod, and in the operable state of the mechanical ignition sensor. The operation rod is brought into contact with the operation rod to limit the movement of the operation rod in the switching lever operating direction, and when the operation rod is disengaged from the arrangement position, the movement limited state is released to move the operation rod in the switching lever operating direction. A safety structure for a mechanical ignition sensor, comprising: a movement restricting member that enables movement of the sensor.