JPH07144601A - Impact sensing device - Google Patents

Abstract

PURPOSE:To secure the sure operation due to the conduction of the first and the second contact points without increasing the dimension of the whole device. CONSTITUTION:The first contact point 23 is fixed on an output member 22, and the second contact point 24 is fixed on a case side 33, and the first contact point 23 is shifted, together with the turn of the output member 22, around the turning center of the output member 22, and the first and the second ccntact points 23 and 24 are brought into slide contact in a prescribed range, and the first and the second contact points 23 and 24 are put into conduction state together.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact sensing device, which is used as a sensor for starting an anti-impact safety system such as an air back.

[0003]

2. Description of the Related Art Conventionally, as this type of shock sensing device,
JP-A-4-78748, JP-A-4-108049
Those disclosed in Japanese Patent Laid-Open No. 4-113957 and Japanese Patent Laid-Open No. 4-113957 are known.

These conventional devices include a case, a movable member arranged in the case and moved by an impact of a predetermined value or more, and a movable member arranged in the case movably and engaged with the movable member. An output member that is disengaged by movement and moves in the projecting direction and collides with a detonator disposed outside the case, and is urged in the projecting direction between the case side and the output member. And a biasing member. Further, the one disclosed in Japanese Patent Application Laid-Open No. 4-78748 is disposed outside the case by being fixedly mounted on the case side, and the movement of the output member is always restricted by the output member. It has a first contact point that moves by an urging force and a second contact point that is fixed to the case side outside the case and that contacts the first contact point by moving the first contact point. And the second contact bring the first contact and the second contact into a conductive state.
The device disclosed in Japanese Patent No. 108049 is fixed to an urging member for moving the output member in a protruding direction in the case, and the urging member moves by expanding and deforming to move the output member. And a second contact that is fixedly disposed in the case on the case side and that comes into contact with the first contact when the first contact moves. And the second contact bring the first contact and the second contact into a conductive state.
The one disclosed in Japanese Patent Laid-Open No. 113957 is fixed to the movable member in the case and is fixed to the case side in the case, and the first contact which moves together with the movable member as the movable member moves. Has a second contact that is arranged in contact with the first contact by moving the first contact,
The contact between the first contact and the second contact brings the first contact and the second contact into conduction. In these conventional devices, one of the air back mechanisms is activated by the collision between the detonator and the output member, and the other air back mechanism is activated by the conduction between the first contact and the second contact. It was

[0005]

However, in the one disclosed in the above-mentioned Japanese Patent Laid-Open No. 4-108949, the first contact point is moved by the extension deformation of the biasing member for moving the output member in the projecting direction. As a result, the first contact and the second contact come into contact with each other, so that the conduction timing between the first contact and the second contact is the timing at which the output member ends moving (collision timing with the detonator). . Therefore, when the output member is moved in the direction opposite to the projecting direction due to the blast pressure from the detonator due to the collision between the output member and the detonator, the contact between the first contact and the second contact is released, and the result is However, there is a possibility that a conduction state between the first contact point and the second contact point can be obtained only at an instant, and the other air back mechanism does not operate, so that there is a certain lack of certainty. Further, in the one disclosed in Japanese Patent Laid-Open No. 4-113957, the first contact and the second contact come into contact with each other as the first contact moves together with the movable member. Since the timing of conduction with the contact point of the output member is the timing immediately after the output member starts moving and is independent of the movement of the output member, the output member moves in the direction opposite to the projecting direction due to the explosion pressure from the detonator. Although the contact between the first contact and the second contact is maintained even when moved, the above-mentioned inconvenience due to the detonation pressure of the detonator does not occur, but the contact with the first contact due to the movement of the movable member In order to establish a structure in which the movable member comes into contact with the second contact, it is necessary to have a structure for holding the movable member at the position after the movement even after the impact of a predetermined value or more that causes the movement of the movable member is eliminated. In the conventional device, the moving part is moved by the output member. Regulates a). For this reason, the number of parts increases, the apparatus itself becomes complicated, and the layout of each component is naturally limited, which leads to an increase in the size of the apparatus itself. Further, in the one disclosed in Japanese Patent Laid-Open No. 4-78748, the movement restriction of the first contact is released by the movement of the output member, and the first contact is moved by its own urging force. Since the first contact and the second contact are in contact with each other, the conduction timing between the first contact and the second contact is the timing immediately after the output member starts to move. Although the contact between the first contact and the second contact is maintained even if the output member is moved in the direction opposite to the projecting direction, the above-mentioned inconvenience does not occur. In order to establish the structure in which the first contact and the second contact are in contact with each other, the first contact and the second contact must be arranged so as to overlap the extension line of the movement locus of the output member (the conventional device). Is below the output member and outside the case Location has been that) It is therefore possible when the layout of the components is limited naturally by increasing the size of the device itself.

Therefore, the present invention provides a shock-sensing device which does not increase the size of the device itself and also ensures a reliable operation due to conduction between the first contact and the second contact. This is a technical issue.

[0007]

[Constitution of the invention]

[0008]

In order to solve the above-mentioned technical problems, the technical means taken in the present invention is provided by fixing the output member in a case and rotating the output member. A first contact that moves with the rotation of the output member around the center of rotation of the output member, and a first contact that is fixedly disposed in the case on the case side and moves. Therefore, the first contact and the second contact that are in sliding contact with each other within a predetermined range are provided, and the first contact and the second contact are formed by the sliding contact between the first contact and the second contact. That is to make it conductive.

[0009]

According to the above technical means, the first contact point is fixed to the output member which is held in the position after being rotated by the biasing member even after the impact of a predetermined value or more is eliminated, and ,
Since the first contact and the second contact are brought into conduction by moving with the rotation of the output member and making sliding contact with the second contact,
The first contact and the second contact can be freely laid out within a range in which they can be fixed to the output member and the case side, and parts for maintaining the conduction state between the first contact and the second contact. Do not increase the number of points or complicate the structure. Therefore, the arrangement of the first and second contacts does not increase the size of the device itself. Further, the sliding contact between the first contact and the second contact is performed over a predetermined range, and the conduction between the first contact and the second contact is immediately after the output member starts rotating in the protruding direction. It is all from turning to ending. Therefore, even if the output member is rotated in the direction opposite to the projecting direction due to the explosion pressure from the detonator, the sliding contact between the first contact and the second contact is unlikely to be released, A reliable operation can be obtained by the conduction between the first contact and the second contact.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the case 1 has a cylindrical shape formed by combining plate-like members 11 and 12, and an impact sensing mechanism 2 is housed inside.

The impact sensing mechanism 2 is composed of a weight 21, a lever 22, a brush 23 and a lead plate 24, and is housed and fixed in the case 1 and supported by a housing on the case side. As shown in FIGS. 1 and 5,
The housing 3 has a cylindrical shape configured by combining the first housing 31, the second housing 32, and the third housing 33. As shown in FIGS. 1 and 2, the weight 21 is swingably supported by the first housing 31 at the position offset from the center of gravity thereof by the pin 25. The lever 22 is rotatably supported by the first housing 31 by a pin 26, and the lever 22 is integrally formed with an output pin 22a, an arm portion 22b, and a foot portion 22c. Around the pin 26, one end is locked to the first housing 31 and the other end is the lever 22.
A torsion spring 28, which is locked to, is wound around. Further, the weight 21 is provided with a semicircular cam portion 27, and the lever 22 can be engaged with and disengaged from the cam portion 27 by a foot portion 22c. Furthermore, the output pin 2 of the lever 22
2a is a detonator 41 for operating one air bag mechanism 4 (a mechanism for protecting the occupant in the driver's seat of the vehicle) by rotating the lever 22 in the protruding direction (counterclockwise direction in FIG. 1), as shown in FIG. It is arranged to collide with.

As shown in FIGS. 1 to 3, the brush 23 is integrally fixed to the arm portion 22b of the lever 22 by welding or the like.

As shown in FIGS. 1, 2 and 4, the lead plate 24 is integrally fixed to the third housing 33 by insert molding or the like.

As shown in FIGS. 1 to 4, the brush 23 has a first contact portion 23a and a second contact portion 23b, and the lead plate 24 has a third contact portion 24a and a fourth contact portion 24b.
Are provided respectively. The first contact portion 23a and the second contact portion 23b are movable along an arc locus around the pin 26, and the third contact portion 24a and the fourth contact portion 24b are the first contact portion 23a and the second contact portion. It is located on the arc locus of 23b and has an arc shape centered on the pin 26. As a result, the first contact portion 23a and the second contact portion 2 due to the rotation of the lever 22 in the protruding direction (counterclockwise direction in FIG. 1)
By the movement of 3b in the counterclockwise direction shown in FIG.
3a and the third contact portion 24a, the second contact portion 23b and the fourth
The contact portions 24b are in sliding contact with each other over a predetermined range. Further, the lead plate 24 is provided with first terminal portions 24c and 24d, and as shown in FIG.
24d is connected via the lead wires 5 and 6 between the power source 7 and the ignition device 81 for activating the other air bag mechanism 8 (a mechanism for protecting the passenger in the passenger seat of the vehicle). As shown in FIGS. 5 and 6, the terminal portions 24c and 24d are formed in the third housing 33 and are fitted into the groove portions 31a formed on the outer periphery of the first housing 31, and the second housing 32 is formed. It is fixed to the extending portion 33a inserted through the through hole 32a formed in the.

In this way, the brush 2 that serves as an electrical contact point
The shock-sensing mechanism 2 having the lead 3 and the lead plate 24 is a case 1
Since it is housed inside and sealed to the outside, insulation of the brush 23 and the lead plate 24 due to moisture or the like is reliably prevented.

Next, the operation will be described.

In the initial state shown in FIG. 1, the cam portion 27 and the lever 22 are in an engaged state, and the weight 21 is moved by the urging force of the torsion spring 28 so that the first housing 31.
Is held at the initial position where the stopper surface 31b and the side surface 21a of the weight 21 are in contact with each other, and the output lever 6 is held at the initial position against the biasing force of the torsion spring 28 by the engagement with the cam portion 27. Has been done. In this state, when a shock of a predetermined value or more is applied in the direction of arrow A, the weight 21 receives the inertial force due to the shock and resists the urging force of the torsion spring 28 around the pin 25 and the counterclockwise direction shown in FIG. Rock to. When the weight 21 swings, the cam portion 27 moves around the pin 25, the engagement between the cam portion 27 and the lever 22 is released as shown in FIG. 8, and the lever 22 moves to the torsion spring 28. Upon receiving the biasing force, the pin 26 is rotated in the protruding direction (counterclockwise direction in FIG. 1). As a result, the output pin 22a and the detonator 4
1, and the detonator 41 is ignited. The rotation of the lever 22 causes the stopper portion 3 formed in the third housing 33 to rotate.
3b and the arm portion 22c of the lever 22 are brought into contact with each other to resist the urging force of the torsion spring 28, and
The lever 22 is held at the rotated position by the contact between the stopper portion 33b and the arm portion 22c and the biasing force of the torsion spring 28. The rotation of the lever 22 causes the brush 23 to move around the pin 26 with the rotation of the lever 22, so that the first and second contact portions 23a, 2 of the brush 23 are moved.
3b is the third and fourth contact points 24a, 24b of the lead plate 24.
And sliding contact. The sliding contact between the first and second contact portions 23a and 23b and the third and fourth contact portions 24a and 24b of the lead plate 24 is caused by the arc shape of the third and fourth contact portions 24a and 24b. Is performed immediately after the lever 22 starts to rotate before colliding with the detonator, and even after the lever 22 has rotated after the output pin 22a and the detonator collide (after the lever 22 has finished rotating). Also) continued. As a result, the third contact portion 24a and the fourth contact portion 24b become the first
Conductive state is established via the contact point portion 23a and the second contact point portion 23b (the conductive state is established between the brush 23 and the lead plate 24).
The ignition device 81 is activated. As a result, one of the air bag mechanisms 4 is activated by the ignition of the detonator due to the collision between the output pin 22a and the detonator 41, and the operation of the ignition device 81 by the conduction between the brush 23 and the lead plate 24 activates the other air bag mechanism 8. .

As described above, the brush 23 and the lead plate 2
Since the electrical connection with 4 is obtained by the sliding contact between the brush 23 and the lead plate 24, the layout can be freely performed within the range where the fixing to the lever 22 and the housing 3 is possible. Further, since the brush 23 is fixed to the lever 22 which is held in the rotated position even after the shock is eliminated,
In order to maintain the conductive state between the brush 23 and the lead plate 24, the number of parts does not increase and the structure does not become complicated.
Therefore, the arrangement of the brush 23 and the lead plate 24 does not increase the size of the apparatus itself.

The sliding contact between the brush 23 and the lead plate 24 is performed immediately after the lever 22 starts to rotate before the output pin 22a collides with the detonator, and after the output pin 22a collides with the detonator. Is carried out over a predetermined range which is also carried out at the position where the lever 22 is rotated (from before the air back mechanism 4 on one side (ignition of the detonator 41) to the air back mechanism 8 on the other side (activation of the ignition device 81). Since the predetermined time for completing the operation is secured), the lever 22
If the brush 2 is rotated in the opposite direction (clockwise direction in FIG. 8) from the projecting direction due to the explosion pressure from the detonator 41, the brush 2
The sliding contact between the lead 3 and the lead plate 24 is unlikely to be released, and the ignition device 81 can be reliably operated by reliably continuing the conduction between the brush 23 and the lead plate 24.

[0021]

According to the present invention, the first contact point is fixed to the output member which is held in the position after being rotated by the biasing member even after the impact of a predetermined value or more is eliminated, and , The first contact and the second contact are brought into conduction by moving with the rotation of the output member and making sliding contact with the second contact, so that the first contact and the second contact are It can be freely laid out within a range where it can be fixed to the case side, and the number of parts does not increase and the structure does not become complicated in order to maintain the conductive state between the first contact and the second contact. As a result, the first and second contacts can be arranged without increasing the size of the device itself. Also, the first
Since the sliding contact between the contact point and the second contact point is performed over a predetermined range, even if the output member is rotated in the direction opposite to the projecting direction due to the blast pressure from the detonator, Also, there is little possibility that the sliding contact between the first contact point and the second contact point is released, and reliable operation can be obtained by the conduction between the first contact point and the second contact point.

[Brief description of drawings]

FIG. 1 is a sectional view of an impact sensing device according to the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is a perspective view of an output member to which a first contact is fixed.

FIG. 4 is a perspective view of a third housing to which a second contact is fixed.

FIG. 5 is a plan view of the housing.

FIG. 6 is a top view of FIG.

FIG. 7 is a diagram showing an impact safety system equipped with an impact sensing device according to the present invention.

FIG. 8 is a cross-sectional view corresponding to FIG. 1, showing the operation of the impact sensing device according to the present invention.

[Explanation of symbols]

 1 Case 21 Weight (movable member) 22 Lever (output member) 28 Torsion spring (biasing member) 41 Detonator 23 Brush (first contact) 24 Lead plate (second contact)

Claims (1)

[Claims] 1. A case, a movable member which is disposed in the case and moves by an impact of a predetermined value or more, and a movable member which is rotatably disposed in the case and is engaged with the movable member. Output member that is disengaged by the movement of the output member and rotates in the protruding direction to collide with a detonator disposed outside the case, and the output member disposed between the case side and the output member. In a shock-sensing device having a biasing member that biases in a projecting direction, the rotation center of the output member is fixed by being disposed in the case while being fixed to the output member and rotating the output member. A first contact, which moves with the rotation of the output member as a center, and a predetermined contact with the first contact, which is fixedly disposed in the case on the case side, and moves the first contact. A second contact that makes sliding contact in a range, An impact sensing device in which the first contact and the second contact are brought into conduction by sliding contact between one contact and the second contact.