JPH06222069A - Mechanical firing sensor - Google Patents

Abstract

PURPOSE:To obtain a significantly downsized mechanical firing sensor in which stabilized operability can be ensured by suppressing adverse effect of frictional force. CONSTITUTION:An inertial mass 40 is held by a rod 42 on one radial side of a cylindrical body part while a firing pin 30 and a trigger lever 50 are disposed vertically on the other radial side. The firing pin 30 is held by the trigger lever 50 and the inertial mass 40 abuts on the roller 58 of the trigger lever 50 thus retaining the roller 58. Furthermore, the inertial mass 40 has an arm part 46 being held in rolling contact state by the roller 58 and an auxiliary roller 66. Consequently, pressing force of the trigger lever 50 against the inertial mass 40 is received by the auxiliary roller 66 and produces no moment and thereby the frictional force between the inertial mass 40 and the rod 42 is reduced thus allowing smooth movement of the inertial mass 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical ignition sensor for detecting a sudden deceleration state of a vehicle.

[0002]

2. Description of the Related Art For example, in a seat belt device mounted on a vehicle, the webbing attached to an occupant is pulled back by a predetermined amount when the vehicle suddenly decelerates to forcibly remove the slack of the webbing for the occupant to tension the webbing. There is one provided with a so-called pretensioner with improved restraint property.

In this type of pretensioner, there are a pretensioner having a structure for tensioning the webbing by forcibly rotating the winding shaft of the webbing retractor and a structure for tensioning the webbing by forcibly pulling the buckle. However, for example, in a structure in which the webbing is tensioned by pulling the buckle, a gas generator equipped with a mechanical ignition sensor is provided. A cylinder is arranged in the gas generator and is connected to the buckle via a wire or the like.

When the vehicle suddenly decelerates, this is detected by a mechanical ignition type sensor, the gas generator is activated, gas is instantaneously generated and the cylinder is moved, and this moving force is transmitted to the buckle via the wire. The buckle is forcibly moved and the webbing is tensioned.

[0005]

A mechanical ignition sensor used in such a conventional pretensioner basically has an ignition pin for igniting a detonator, and an inertial body that inertially moves due to a large acceleration. Although it is composed of a trigger member such as a ball which is interposed between the ignition pin and the inertial body to prevent movement of the ignition pin (as an example, Japanese Patent Publication No. 52-13104), this type of general type In the mechanical ignition type sensor, the ignition pin is formed in an axial shape having a flange portion, the inertial body is formed in a cylindrical shape, and the inertial body is slidably arranged concentrically around the ignition pin. Therefore, in order to secure a space for arranging the trigger member between the inertial body and the ignition pin, the overall size of the sensor inevitably expands in the radial direction. There is room for improvement Oite.

On the other hand, the inertial body is slidably held by a rod (cylinder) so that when a shock load for an extremely short time acts (for example, when an occupant makes an accidental contact), so-called air is used. There is also proposed a mechanical ignition sensor configured to limit the movement of the inertial body by the damping effect and prevent the sensor from malfunctioning.

However, in this type of mechanical ignition sensor, the trigger member is interposed between the inertial body and the ignition pin to prevent movement of the ignition pin in a normal state, and the trigger member itself is held in this state by the inertial body. In addition, since the trigger member is naturally arranged at a certain distance in the radial direction with respect to the holding position of the inertial body, that is, the rod, the pressing force of the trigger member acting on the inertial body is caused by this. A moment around the rod was generated in the inertial body by (force of the ignition pin pressing the trigger member).

Therefore, the frictional force between the inertial body and the rod becomes large, which hinders the smooth movement of the inertial body and causes variations in the sensitivity of operation of the mechanical ignition type sensor.

In this case, if the mass of the inertial body is simply increased in order to reduce the influence of the frictional force between the inertial body and the rod, the overall shape becomes large and heavy.

In consideration of the above facts, the present invention has an object to obtain a mechanical ignition type sensor which can be made into an extremely small shape and, at the same time, can reduce the adverse effect of frictional force and ensure stable operability. is there.

[0011]

A mechanical ignition sensor according to a first aspect of the present invention is arranged on one side in the radial direction of a cylindrical main body so as to be movable along the axial direction of the main body.
An inertial mass body that is always biased by a bias spring and moves against the biasing force of the bias spring by an inertial force when a predetermined load is applied, and a pointed portion that is formed in a plate shape and that engages a detonator at one end Is disposed movably along the axial direction of the main body on the other side in the radial direction of the main body opposite to the inertial mass body, and is moved in the axial direction by the urging force of the firing spring to ignite the detonator. An ignition pin, an engaging portion that is located immediately above the ignition pin and is rotatably supported by a support shaft in a direction of approaching and separating from the ignition pin, and that engages with the ignition pin; And a roller that is located farther from the engaging portion and is always in rolling contact with the inertial mass body, and normally, the roller is pressed by the inertial mass body and the engaging portion engages with the ignition pin. Then In the state in which the rotation around the support shaft is blocked, and the ignition pin is pressed against the biasing force of the firing spring while being pressed by the ignition pin in the direction away from the ignition pin. Hold in a position separated from the detonator, and when the inertial mass body is moved, the rotation prevention by the inertial mass body is released, and the roller is in a direction to separate from the ignition pin while rolling contact with the inertial mass body. And a trigger lever that rotates to enable movement of the ignition pin.

A mechanical ignition sensor according to a second aspect of the present invention is the mechanical ignition sensor according to the first aspect, wherein the trigger lever has an elongated hole for slidably supporting the roller, and the inertia When the mass body is moved by a predetermined amount or more, the roller slides along the elongated hole and rolls to release the holding of the ignition pin.

A mechanical ignition sensor according to a third aspect of the present invention is the mechanical ignition sensor according to the first or second aspect, wherein the inertial mass body is arranged along the axial direction of the body. And a movably held rod, and an auxiliary roller that is arranged so as to face the roller and holds and holds the inertial mass body in a rolling contact state with the roller.

[0014]

In the mechanical ignition type sensor according to the first aspect of the present invention, the ignition pin is normally located away from the detonator against the biasing force of the firing spring, and the inertial mass body is rotated by the bias spring to move the trigger lever. It has entered the locus, and the trigger lever holds the ignition pin while rotating in the direction of approaching the ignition pin, and the rotation of the trigger lever is blocked by the contact of the roller with the inertial mass body, and the ignition pin is held. Has been maintained.

When a large acceleration acts on the mechanical ignition type sensor, the inertial mass body inertially moves and is separated from the rotation locus of the trigger lever, so that the trigger lever can be rotated around the support shaft. Therefore, the trigger lever pressed by the ignition pin urged by the firing spring in the direction away from the ignition pin rotates in the direction away from the ignition pin while the roller makes rolling contact with the inertial mass body. As a result, the holding of the ignition pin by the engaging portion of the trigger lever is released, the ignition pin moves in the axial direction by the urging force of the firing spring, the point collides with the detonator, and the detonator is ignited.

Here, in the mechanical ignition type sensor, the inertial mass body is arranged on one side in the radial direction of the cylindrical body, and the ignition pin and the trigger lever are arranged on the other side in the radial direction so as to move up and down. Therefore, the respective parts do not erode each other's arrangement space, and no wasted space is produced as a whole.

Therefore, the entire shape does not become large in order to secure the space for disposing one component as in the conventional case, and the size can be extremely reduced.

Furthermore, when the inertial mass body inertially moves and the trigger lever rotates around the support shaft, the roller of the trigger lever rotates while making rolling contact with the inertial mass body, so that the trigger lever (roller) is rotated. ) And the inertial mass body are reduced in friction force, and the operation sensitivity of the mechanical ignition sensor is stabilized. Thus, without increasing the mass of the inertial mass body, the adverse effect of the frictional force between the trigger lever and the inertial mass body can be reduced and stable operability can be ensured.

According to another aspect of the mechanical ignition sensor of the present invention, when a large acceleration acts on the mechanical ignition sensor, the inertial mass moves inertially, and the roller of the trigger lever rolls into contact with the inertial mass and separates from the ignition pin. Rotate in the direction you want. As a result, the holding of the ignition pin by the engaging portion of the trigger lever is released, the ignition pin moves in the axial direction by the urging force of the firing spring, the point collides with the detonator, and the detonator is ignited.

Since the roller of the trigger lever which contacts the inertial mass body is slidably supported in the elongated hole, when the inertial mass body inertially moves to rotate the trigger lever, the inertial mass is moved. Only when the body moves extremely minutely after passing the rotation blocking switching position of the trigger lever, the roller rolls while sliding along the elongated hole. That is, when the roller slides along the long hole, the trigger lever is reliably rotated and the holding of the ignition pin by the engaging portion is released. Therefore, more reliable and stable operability can be secured.

In the mechanical ignition sensor according to the third aspect of the invention, the inertial mass body is nipped and held in a rolling contact state by the roller and the auxiliary roller arranged so as to face the roller. Even if the pressing force (the force with which the ignition pin presses the trigger lever) acts on the inertial mass body,
This is received by the auxiliary roller, so that the inertial mass does not generate a moment around the rod.

Therefore, when the inertial mass body moves by inertia, the frictional force between the inertial mass body and the rod becomes small, and the inertial mass body moves only against the rolling resistance with the auxiliary roller. Get better.

As described above, it is possible to prevent the generation of a moment and to secure more reliable and stable operability without making the inertial mass body large and heavy.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a mechanical ignition type sensor 10 according to the present invention.
Is shown in an exploded perspective view. 2 and 3 are longitudinal sectional views of the mechanical ignition sensor 10.
FIG. 4 shows a cross-sectional view of the mechanical ignition type sensor 10. Further, FIG. 5 shows a cross-sectional view of the mechanical ignition type sensor 10 taken along line 5-5 of FIG. 2, and FIG. 6 shows the mechanical ignition type sensor 10 taken along line 6-6 of FIG. A cross-sectional view is shown.

The mechanical ignition type sensor 10 has a sensor cover 12. The sensor cover 12 has a bottom wall 1 at one end.
4 is formed in a substantially cylindrical shape, and a through hole 16 is formed in the bottom wall 14 on the axis. This sensor cover 1
In the inside of 2, the body block 18 and the lid block 2
0 is placed. The body block 18 is formed in a substantially cylindrical block shape, and the bottom wall 22 is connected and fixed to the bottom wall 14 of the sensor cover 12. The lid block 20 is formed in a disk shape, and is connected and fixed to the opening side end of the body block 18. That is,
The body block 18 and the lid block 20 are integrally fastened from the outside by the sensor cover 12, and thus,
A main body portion of the mechanical ignition type sensor 10 is configured. Further, an O-ring 24 is arranged between the sensor cover 12 and the lid block 20 to ensure hermetic sealing. The body block 18 may be divided into a plurality of parts for the convenience of manufacture or assembly.

A through hole 26 and a through hole 28 are formed in the bottom wall 22 of the body block 18, and correspond to an ignition pin 30 and a rod 42, which will be described later.

An ignition pin 30 is arranged inside the body block 18. The ignition pin 30 is formed in a generally L-shaped cross section by bending a plate material, and is slidably arranged in a guide groove 32 formed in the body block 18. In this case, the ignition pin 30 (that is, the guide groove 32) is located on one side in the radial direction of the body block 18 (the main body portion of the mechanical ignition type sensor 10) and is movable along the axial direction of the body block 18. It is said that.

The ignition pin 30 has a pointed portion 34 projectingly formed on one end portion of the L-shape (end portion on the axial center of the body block 18) and on the side corresponding to the bottom wall 22 of the body block 18. . The pointed portion 34 projects to the outside from the above-described through hole 26 formed in the bottom wall 22 when the ignition pin 30 is moved to the side of the bottom wall 22 of the body block 18 most.

On the other hand, a holder 36 is integrally connected and fixed to the lower portion (lower side in FIG. 2) of the ignition pin 30. A firing spring 38 is arranged between the holder 36 and the lid block 20, and always urges the ignition pin 30 toward the bottom wall 22 (through hole 26).

On the other hand, to the side of the ignition pin 30, that is, the body block 18 (main body of the mechanical ignition sensor 10).
An inertial mass body 40 is arranged on the other side in the radial direction of. The inertial mass body 40 is formed in an arcuate shape in a front view and a rectangular shape in a side view, that is, a so-called gutter shape, and has a through hole 28 in the bottom wall 22.
It is movably held along the axial direction of the body block 18 by a rod 42 that is fixed so as to penetrate therethrough. Further, a bias spring 44 is arranged between the inertial mass body 40 and the lid block 20, and always urges the inertial mass body 40 toward the bottom wall 22. The inertial mass body 40 can move against the biasing force of the bias spring 44 by the inertial force when a predetermined load is applied.

As shown in FIG. 5, an arm portion 46 extends toward the opposite side of the rod 42 from the upper part of the inertial mass body 40 (upper side of FIGS. 2, 3 and 5), and a trigger which will be described later is formed. It corresponds to the lever 50 and the auxiliary roller 66.

A trigger lever 50 is arranged laterally of the inertial mass body 40 and directly above the ignition pin 30. The trigger lever 50 is formed in a U-shaped cross section by bending a plate material, and a spindle 52 is attached to one end in the longitudinal direction. The support shaft 52 is held in a shaft support hole 54 formed in the body block 18, and thereby the trigger lever 50 is rotatably supported in a direction in which the trigger lever 50 comes in contact with and separates from the ignition pin 30. An engagement portion 56 is formed so as to project on the back surface side of the trigger lever 50 (the side of the ignition pin 30). The engaging portion 56 engages with the end portion of the ignition pin 30 on the side of the pointed portion 34, so that the pointed portion 34 of the ignition pin 30 urged by the firing spring 38 is separated from the through hole 26. keeping.

The other side of the trigger lever 50 (the support shaft 52
A roller 58 is arranged at the tip end on the opposite side).
The roller 58 is located apart from the engaging portion 56 with respect to the rotation center of the trigger lever 50, that is, the support shaft 52, and the support shaft 60 is attached to the roller 58. The support shaft 60 is slidably inserted into a long hole 62 formed in the trigger lever 50, whereby the roller 58 is slidable along the long hole 62.

The roller 58 corresponds to the inertial mass body 40 described above.
It corresponds to the lower surface side of the arm portion 46 of the
When the engaging portion 56 separates from the ignition pin 30 by rotating to release the holding thereof, the roller 58 moves while rolling the lower surface side of the arm portion 46 to the side surface side.

Further, normally, the inertial mass body 40 is located at a position closest to the bottom wall 22 of the body block 18 by the bias spring 44. In this state, the lower surface side of the arm portion 46 of the inertial mass body 40 is the trigger lever 50. The roller 58 of the trigger lever 50 and the engaging portion 56 of the trigger lever 50.
Is engaged with the end portion of the ignition pin 30 and holds the ignition pin 30 at a position where its apex 34 is separated from the through hole 26.

On the other hand, an auxiliary roller 66 is arranged directly above the arm portion 46 of the inertial mass body 40 so as to face the roller 58. A support shaft 68 is attached to the auxiliary roller 66, and the support shaft 68 is held in a shaft support hole 70 formed in the body block 18, whereby the auxiliary roller 66 is provided.
Is rotatable. The auxiliary roller 66 corresponds to the upper surface side of the arm portion 46 of the inertial mass body 40,
The arm portion 46 of the inertial mass body 40 is nipped and held in a rolling contact state with the roller 58. Therefore, when the trigger lever 50 rotates and the engaging portion 56 separates from the ignition pin 30 and releases its holding, the arm portion 46 moves on the upper and lower surfaces of the roller 58 and the auxiliary roller 66.

The side of the trigger lever 50 (the lid block 20
The release lever 72 is arranged on the side of (). The release lever 72 is supported by a shaft 74, and the shaft 74 passes through a support hole 76 formed in the lid block 20 and is supported by an O-ring 78. A spring pin 80 is fixed to one end of the shaft 74. The spring pin 80 is inserted into the recess 82 formed in the release lever 72, whereby the release lever 72 rotates integrally with the shaft 74.

As shown in FIG. 6, the release lever 72 has a locking piece 84 extending toward the inertial mass body 40. In this locking piece 84, the release lever 72 has a shaft 74.
By rotating together with the inertial mass body 40, the inertial mass body 40 can be moved into and out of the movement path, that is, the inertial mass body 40 can be moved into and out of the movement path of the inertial mass body 40.
Can be engaged with the end on the side of. In the state where the locking piece 84 is engaged with the end portion of the inertial mass body 40, the movement of the inertial mass body 40 is prevented regardless of the action of a predetermined load.

A torsion spring 86 is arranged between the release lever 72 and the lid block 20 in a state of connecting them, and a locking piece 84 of the release lever 72 is provided on the inertial mass body 4.
The inertial mass body 40 is always biased in the direction in which it enters the movement locus of 0 and engages with the inertial mass body 40. Therefore, in this state, the movement of the inertial mass body 40 is blocked.

An operating lever 88 is attached to the tip of the shaft 74 protruding from the support hole 76 of the lid block 20 to rotate the shaft 74, that is, the release lever 72 from the outside.

The mechanical ignition type sensor 10 having the above structure.
Is assembled in, for example, a gas generator for a pretensioner (detailed structure is not shown).

The gas generator contains a gas generating agent, and a detonator 90 for igniting and burning the gas generating agent is arranged. The detonator 90 is the detonator piece 9
2 is provided in the second block 2 and faces the through hole 26 formed in the bottom wall 22 of the body block 18 in the state where the mechanical ignition sensor 10 is assembled. The mechanical ignition sensor 10 is fixed by the support ring 94 in this state. An O-ring 96 is arranged between the sensor cover 12 and the mounting portion of the gas generator to ensure hermetic sealing. Therefore, when the mechanical ignition sensor 10 is assembled to the gas generator, the pointed portion 34 of the ignition pin 30 that can project from the through hole 26 formed in the bottom wall 22 of the body block 18 can collide with the detonator 90. Has become.

Next, the operation of this embodiment will be described. In the mechanical ignition sensor 10 of this embodiment configured as described above,
Normally, as shown in FIG. 2, the ignition pin 30 is located away from the detonator 90 (the through hole 26 of the body block 18) against the biasing force of the firing spring 38, and the trigger lever 50 is engaged with the engaging portion 56. Engages with the end of the ignition pin 30 and holds the ignition pin 30. Further, as shown in FIGS. 3 and 4, the inertial mass body 40 is located at a position closest to the bottom wall 22 by the bias spring 44, that is, the arm portion 46 enters the rotation locus of the trigger lever 50 (see FIGS. In the state shown in FIG. 5, the arm portion 46 is nipped and held in a rolling contact state between the roller 58 of the trigger lever 50 and the auxiliary roller 66. Therefore, the arm 46 prevents the trigger lever 50 from rotating and maintains the ignition pin holding state.

Furthermore, the locking piece 84 of the release lever 72 urged by the torsion spring 86 enters the movement locus of the inertial mass body 40 as shown by the solid line in FIG. Engaging the end of the inertial mass 40
Is blocked from moving.

Here, by operating the operation lever 88 to rotate and hold the release lever 72, as shown in the two-dot chain line in FIG. 6 and also in FIG. The inertial mass body 40 is moved away from the movement locus of the above. As a result, the mechanical ignition type sensor 1
0 is set to the ready state.

When a large acceleration acts on the mechanical ignition type sensor 10 in such a state, the inertial mass body 40 inertially moves in the direction of arrow A in FIGS. 2 and 3. In this case, the inertial mass body 40 moves while the upper surface of the arm portion 46 is in rolling contact with the auxiliary roller 66 and the lower surface of the arm portion 46 is in rolling contact with the roller 58 of the trigger lever 50. When the roller 58 reaches the lower end of the arm 46, the arm 46
Is separated from the rotation locus of the trigger lever 50, and the trigger lever 50 can be rotated around the support shaft 52. Therefore, the trigger lever 50 pressed by the firing pin 30 urged by the firing spring 38 in the direction away from the ignition pin 30 is rotated in the direction away from the ignition pin 30.

As a result, as shown in FIG. 7, the engaging portion 56 of the trigger lever 50 is separated from the ignition pin 30 to release the holding of the ignition pin 30. Therefore, the ignition pin 30 is attached to the firing spring 38. The force moves to the direction of the bottom wall 22, the point 34 projects from the through hole 26, collides with the detonator 90 of the gas generator, and the detonator 90 is ignited.
As a result, the gas generating agent of the gas generator is ignited and combusted, and, for example, the pretensioner is operated.

Here, in this mechanical ignition type sensor 10,
As shown in FIG. 5, the body block 18 and the lid block 2
0 and the sensor cover 12 has a configuration in which the inertial mass body 40 is arranged on one side in the radial direction of the main body part formed in a cylindrical shape, and the ignition pin 30 and the trigger lever 50 are arranged vertically on the other side in the radial direction. Therefore, the respective parts do not erode each other's arrangement space, and a wasteful space does not occur as a whole.

Therefore, unlike the conventional mechanical ignition type sensor, there is no wasteful space for securing the space for disposing one component, and the overall shape does not become large.
It can be made extremely small.

When the inertial mass body 40 inertially moves and the trigger lever 50 rotates about the support shaft 52, the roller 58 of the trigger lever 50 rolls and comes into contact with the arm portion 46 of the inertial mass body 40. To rotate, trigger lever 50
The frictional force between the (roller 58) and the inertial mass body 40 is reduced, and the operation sensitivity of the mechanical ignition sensor 10 is stabilized. Thus, without increasing the mass of the inertial mass body 40, the adverse effect of the frictional force between the trigger lever 50 and the inertial mass body 40 can be reduced and stable operability can be ensured.

Further, in the mechanical ignition sensor 10, the roller 58 is slidably supported in the elongated hole 62 formed in the trigger lever 50, so that the arm portion 46 of the inertial mass body 40 is in the initial position (that is, A predetermined amount from the state where the lower surface wall is in contact with the roller 58 as shown in FIG.
After reaching the switching position (that is, the edge of the lower surface wall), the roller 58 slides along the long hole 62 and rolls to the side surface of the arm portion 46 only by moving extremely minutely.
Therefore, the inertial mass body 40 inertially moves, the trigger lever 50 rotates, and the engaging portion 56 releases the holding of the ignition pin 30 with certainty, and more reliably and stably operates.

Furthermore, in the mechanical ignition type sensor 10,
The arm portion 46 of the inertial mass body 40 is nipped and held in a rolling contact state by the roller 58 of the trigger lever 50 and the auxiliary roller 66 arranged so as to face the roller 58, so that the trigger lever 50 is pushed. Pressure (Ignition pin 30
Even if a force (pressing the trigger lever 50) acts on the inertial mass body 40, it is received by the auxiliary roller 66, and as a result, the inertial mass body 40 does not generate a moment around the rod 42.

Therefore, when the inertial mass body 40 inertially moves, the inertial mass body 40 and the rod 42 that holds the inertial mass body 40.
The frictional force between and becomes smaller, and the inertial mass body 40 needs to move only against the rolling resistance with the auxiliary roller 66. Therefore, when a large acceleration acts on the mechanical ignition type sensor 10, the inertial mass body 40 moves smoothly and operates more reliably and stably.

Thus, in the mechanical ignition type sensor 10,
The inertial mass body 40 can be made into a very small shape without making it large and heavy, and furthermore, the moment of the inertial mass body 40 can be prevented from being generated to reduce the adverse effect of frictional force and to ensure reliable and stable operability. Can be secured.

Although the mechanical ignition sensor 10 is used to operate the pretensioner in the present embodiment, the present invention is not limited to this, and other devices such as an airbag that operate when a sudden acceleration is applied. Of course, it can be used in a device.

[0056]

As described above, the mechanical ignition sensor according to the present invention has the following effects.

In the mechanical ignition sensor according to the first aspect of the present invention, the inertial mass body, the ignition pin, and the trigger lever parts do not erode their respective arrangement spaces, so that no wasted space is produced as a whole. Therefore, the overall shape does not become large in order to secure a space for disposing one component, and it is possible to make the size extremely small.

Furthermore, when the inertial mass body inertially moves and the trigger lever rotates around the support shaft, the frictional force between the trigger lever (roller) and the inertial mass body becomes small,
The sensitivity of operation is stable. Thus, without increasing the mass of the inertial mass body, the adverse effect of the frictional force between the trigger lever and the inertial mass body can be reduced and stable operability can be ensured.

In the mechanical ignition sensor according to the second aspect of the invention, when the inertial mass body inertially moves and the trigger lever rotates, the roller of the trigger lever rolls while sliding along the elongated hole to ensure the movement. Since the trigger lever is rotated, more reliable and stable operability can be secured.

In the mechanical ignition sensor according to the third aspect of the present invention, the inertial mass body is sandwiched and held by the roller and the auxiliary roller in a rolling contact state, so that the pressing force of the trigger lever (the ignition pin presses the trigger lever). Force acting on the inertial mass body is received by the auxiliary roller, and as a result, the inertial mass body does not generate a moment around the rod. Therefore, when the inertial mass body moves by inertia, the frictional force between the inertial mass body and the rod becomes small, and the inertial mass body can be secured more reliably and stably without making the inertial mass body large and heavy.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a mechanical ignition type sensor according to the present invention.

FIG. 2 is a vertical cross-sectional view showing an initial state of a trigger lever and a roller of a mechanical ignition sensor.

FIG. 3 is a longitudinal sectional view showing an initial state of an inertial mass body of a mechanical ignition type sensor.

FIG. 4 is a cross-sectional view showing a trigger lever and a roller of a mechanical ignition sensor.

5 is a cross-sectional view taken along line 5-5 of FIG. 2 showing an arrangement state of an inertial mass body, a trigger lever and an ignition pin of a mechanical ignition type sensor.

6 is a cross-sectional view taken along line 6-6 of FIG. 3, showing a locking piece of a release lever of a mechanical ignition sensor.

FIG. 7 is a cross-sectional view corresponding to FIG. 2, showing a state after the mechanical ignition type sensor is activated.

[Explanation of symbols]

 10 Mechanical Ignition Sensor 18 Body Block 20 Lid Block 30 Ignition Pin 34 Tip 38 Firering Spring 40 Inertia Mass 42 Rod 44 Bias Spring 46 Arm 50 Trigger Lever 56 Engagement 58 Roller 62 Long Hole 66 Auxiliary Roller 72 Release Lever 84 locking piece

Claims (3)

[Claims] 1. A cylindrical main body is disposed movably on one side in the radial direction along the axial direction of the main body, and is always biased by a bias spring, and when a predetermined load is applied, inertia force causes the bias spring to move. An inertial mass body that moves against an urging force, and a plate-shaped one end that has a pointed portion that engages with a detonator, and the other side in the radial direction of the body opposite to the inertial mass body. An ignition pin that is movably arranged along the axial direction of the main body, moves axially by the urging force of a firing spring to ignite a detonator, and is positioned immediately above the ignition pin to the ignition pin by a spindle. An engaging portion that is rotatably supported in a direction in which it comes in contact with and separates from the engaging portion that engages with the ignition pin, and is positioned farther from the engaging portion than the engaging portion with respect to the support shaft, and always makes rolling contact with the inertial mass body. B In general, the roller is pressed by the inertial mass body so that the engaging portion engages with the ignition pin and is prevented from rotating around the support shaft. The ignition pin is held in a position separated from the detonator against the biasing force of the firing spring while being pressed in a direction away from the ignition pin by the ignition pin, and when the inertial mass body is moved, A trigger lever that is released from rotation inhibition by the inertial mass body and that rotates while the roller is in rolling contact with the inertial mass body in a direction away from the ignition pin to enable movement of the ignition pin. Mechanical ignition sensor. 2. The trigger lever has an elongated hole that rotatably supports the roller, and the roller slides along the elongated hole when the inertial mass body is moved by a predetermined amount or more. The mechanical ignition type sensor according to claim 1, wherein the rolling pin releases the holding of the ignition pin while moving. 3. The inertial mass is arranged between a rod arranged along the axial direction of the main body and holding the inertial mass body so as to be movable along the axial direction, and the roller arranged opposite to the roller. The mechanical ignition type sensor according to claim 1 or 2, further comprising: an auxiliary roller that nips and holds the body in a rolling contact state.