JPH01319222A - Collision detecting switch device - Google Patents

Abstract

PURPOSE:To prevent a magnet from being moved by a low-speed collision or the resonance of a coil spring and obtain a collision detecting switch device with high reliability by moving the magnet against the absorption force between the magnet and a suction member and pressing the coil spring via the movement of the magnet. CONSTITUTION:A magnet 17 is brought into contact with a bias adjusting member 21 by the spring pressure of a coil spring 20, an iron plate 23 capable of absorbing the magnet 17 is arranged behind the magnet 17 via the bias adjusting member 21, thus the magnet 17 is moved against the absorption force between the magnet 17 and the iron plate 23 when a collision of a fixed force or above occurs, the coil spring 20 is pressed by the magnet 17. The magnet 17 is not moved when an intermittent brake is applied or a car runs on an irregular road. The magnet 17 is not directly slid, a slide member 16 made of a material with a relatively good sliding property such as Duracon is used, thus sliding is very good. No malfunction occurs even when the coil spring is resonated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a collision detection switch device for detecting a collision and activating an air pack when a vehicle collides.

(Prior art) A conventional collision detection switch device of this type was disclosed in Japanese Patent Application Laid-open No. 1983-
The one shown in Japanese Patent No. 141044 is known.

The collision detection switch device having the above configuration will be explained based on FIG. 4.

In the figure, reference numeral 1 denotes a reed switch, and a cylindrical metal holder 2 is disposed around the outer periphery of the reed switch 1, and the holder 2 is covered with a case 3. The case 3 is composed of an outer part 4, an inner part 5, and a stopper part 6 for suppressing the movement of the magnet 7, and a coil spring 8 and a coil spring 8 are provided between the outer part 4 and the inner part 5 to abut against the stopper part 6. A magnet 7 is located there.

The operation of the above configuration will be explained. Assume that while the vehicle is running, the front part of the vehicle collides with something, causing a certain deceleration in the direction of travel (leftward in the figure). At this time, when the deceleration caused by the collision becomes larger than the force of the coil spring 8 pressing the magnet 7 against the stopper part 6, the magnet 7, which had been pressed by the coil spring 8, resists the spring pressure of the coil spring 8 and moves in the direction of travel. (middle left). As a result, the moment the magnet 7 approaches the contact portion of the reed switch 1, the switch is turned on, activating the airbag, and preventing contact between the steering wheel and the head, face, etc. After the collision, the magnet 7 is moved to the stopper part 6 by the elastic force of the coil spring 8.
It is something that is forced upon us.

[Problem to be solved by the invention]

Generally, when the magnet is opened against the spring pressure of the coil spring 8 as in the conventional example above, it is necessary to configure the switch so that it does not operate in the event of a collision with deceleration below a certain level (low-speed collision). be. (For example, 161fa/
Therefore, the spring pressure of the coil spring was set at w4 so that the switch was turned on by the movement of the magnet 7 only when the collision speed was 161 m/h or more.

However, if the magnet 7 is held only by the coil spring 8, intermittent braking or
When the number of vibrations determined by the magnet 7 and the coil spring 8 (fixed frequency) matches the number of vibrations of the car (resonance state) when driving on a rough road, the amplitude increases, and as a result, the vibration of the coil spring 8 and the magnet 7 increases. had to move repeatedly after leaving the building,
Even though the car has not collided, the switch is turned to O.
There was a problem that the result was N.

Therefore, the present invention was made in order to solve the above-mentioned conventional technical problems, and an object of the present invention is to obtain a highly reliable collision detection switch device that does not malfunction even when resonance occurs in a coil spring. do.

[Means to solve the problem]

In order to solve the above technical problem, a first means of the present invention includes a reed switch, a protection member arranged to surround the reed switch, and a magnet arranged around the outer periphery of the protection member via a coil spring. By moving the magnet against the spring pressure of the coil spring, the reed switch is turned off.
In the collision detection switch device having the configuration N, the magnet is brought into contact with a magnet abutting member by the spring pressure of a coil spring, and an absorbing member that attracts the magnet via the magnet abutting member is arranged behind the magnet. There is.

A second means of the present invention includes a reed switch, means for fixing the reed switch, and a magnet arranged so as to surround the reed switch, and the reed switch is turned on by the movement of the magnet. In the push button switch having the following configuration, the magnet is fixed to a leaf spring member, and the leaf spring member has a magnet fixing part in the center capable of fixing the magnet, an outer peripheral part fixed inside the case, and these magnet fixing parts. It consists of a plurality of flexible parts that connect the outer peripheral parts and make the magnet fixing part movable using the outer peripheral part as a fulcrum,
An absorbing member that attracts the magnet is provided behind the leaf spring member.

A third means of the present invention includes a reed switch, a protection member disposed to surround the reed switch, and a magnet disposed on the outer periphery of the protection member via a coil spring to resist the spring pressure of the coil spring. In a collision detection switch device configured such that a reed switch is turned on when the magnet moves, an absorbing member for attracting the magnet is disposed around the outer periphery of the magnet.

[Effect]

Therefore, in the first means of the present invention, since a bias is applied to the magnet in the initial state and a coil spring with a small spring force is used, the magnet will not move when a resonance state occurs. do not have.

In the second method, a bias is applied to the magnet in the initial state, and the magnet is attached to a leaf spring member having a flexible portion. Even with this configuration, if a resonance state occurs, the magnet does not move.

In the third method, the magnet moves against the attraction force of the attraction member, and then uses a repulsive force to press the spring, a coil spring with a small force, so this method also causes a resonance state. The magnet will not move if

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a sectional view showing a first embodiment of the collision detection switch device, FIG. FIG. 2(a) is a plan view showing the leaf spring member, and FIG. 3 is a sectional view of main parts showing the third embodiment.

In FIG. 1, reference numeral 11 denotes a case made of insulating resin, and inside this case 11 there is a reed switch 12, a sleeve 13 formed in a cylindrical shape made of brass to cover the reed switch 12, and a sleeve 13 formed of brass to cover the reed switch 12. The first one attached to both ends. A second sleeve fixing member 14 , 15 is fixed within the case 11 . A cylindrical sliding member 16 is attached to a cylindrical magnet 17 on the outer periphery of the sleeve 13.
The coil spring receiving portion 18 of the first sleeve fixing member 14 and the sliding member 16 are arranged so as to be slidable with the sleeve attached.
A coil spring 20 is interposed between the coil spring receiving portion 19 and the coil spring receiving portion 19 . One end of the sliding member 16 and the magnet 17 is brought into contact with a sliding member abutting portion 22 formed in the central recess of the bias adjusting member 21 . Further, in the direction of the bias adjustment member 21, an iron plate 2 for attracting the magnet 17 is provided.
3 is provided, and in an initial state in which the sliding member 16 does not slide around the sleeve 13, the magnet 17 is biased by the coil spring 20 and the iron plate 23 in the opposite direction to the moving direction. Furthermore, the bias adjustment member 21 is
The screw hole 25 for attaching the screw 24 is formed horizontally, so by adjusting the screw position, the coil spring 20 can hold the coil spring receiving part 19 of the sliding member 16. The pressing force and the attractive force that attracts the magnet 17 to the iron plate 23 can be adjusted. In addition, the first sleeve fixing member 14 and the sliding member 1
A movement suppressing member 26 for suppressing movement of the magnet 17 is provided between the magnets 6 and 6.

With the above configuration, when a car collides with a certain deceleration, the sliding member 16 having the magnet 17 resists the attractive force between the magnet 17 and the iron plate 23 and hits the sliding member abutting portion 2.
2 and press the coil spring 20. As a result, the sliding member 16 having the magnet 17 slides around the sleeve 13, and when the magnet 17 is located near the contact point of the reed switch 12, the switch is turned on. The coil spring receiving portion 19 of this sliding member 16 is located within the movement suppressing member 26 while pressing the coil spring 20, and the outer peripheral end 54 of the magnet 17 comes into contact with the movement suppressing member 26, so that the magnet 17 is moved. is suppressed and returns to the original state due to the spring pressure of the coil spring 20 and the attractive force between the magnet 17 and the iron plate 23. (
The reed switch 12 is turned off again. ) The reason why the movement suppressing member 26 is provided is that the sliding member 1 is
For example, 6 is traveling in an extreme direction due to a high-speed collision (left side in the figure)
When the reed switch 12 is moved, the switch is first turned on near the point where the reed switch 12 passes, and when the reed switch 12 continues to move, the switch is turned off. Then, the sliding member 16 is returned by the spring pressure of the coil spring 20, and the moment it moves near the contact point of the reed switch 12 in the opposite direction, the switch is turned ON again. If the ON is repeated 21 times or more in this way, the ON signal will be sent even though the airbag is activated at the first ON, which will put a burden on the battery, so reduce the burden on the battery. It is for the purpose of

Next, a second embodiment of the collision detection switch device is shown in Fig. 2(a).
, (b).

A cylindrical sleeve 28 covers the lead switch 27.
The structure in which both ends of the sleeve 28 are supported by the first and second sleeve fixing members 38 and 39 is the same as in the first embodiment, but this embodiment is characterized by the following structure. .

That is, as in the first example I7I, the I fj member 16,
Magnet 29 without providing coil spring 20 and movement suppressing member 26
is moved by a plate spring member 30.

The leaf spring member 30 is made of stainless steel, for example, and has a magnet fixing part 31 in the center to which the magnet 29 can be attached, and a reed switch 27 can be inserted into the fitting recess 32 of the magnet fixing part 31 in the center. A magnet 2 having a through hole 33
9 are fitted and fixed. And an annular outer peripheral part 3
4 is fixed to the inner wall 36 of the case 35, and this outer peripheral portion 34
A plurality of approximately S-shaped flexible portions 37 are provided between the magnet fixing portion 31 and the magnet fixing portion 31 . Also, behind the leaf spring member 30 is an iron plate 40 for attracting the magnet 29! fi is provided.

With the above configuration, when a car collides with something at a certain deceleration, the magnet fixing part 31 having the magnet 29 moves forward due to the bending of the bending part 37 against the attraction force between the magnet 29 and the iron plate 40. Move in the direction (to the left in the diagram). As a result, the moment the magnet 29 moves to the vicinity of the contact portion of the reed switch 27, the switch is turned on.

Next, a third embodiment of the collision detection switch device will be described with reference to FIG. 3.

In the figure, reed switch 41 and reed switch 4
a cylindrical sleeve 42 provided to cover 1;
The first one fixes both ends of this sleeve 42. A second sleeve fixing member 43, 44, a first magnet 45 attached to -1, an opening member 46 that can slide on the outer periphery of the sleeve 42, and a coil spring receiving part 47 of the second sleeve fixing member 44 and slide. The present embodiment is similar to the first embodiment in that it includes a coil spring 49 interposed between the coil spring receiving portions 48 of the member 46 and a movement suppressing member 50, but the present embodiment is characterized by the following configuration.

That is, the second laminated stone 51 is provided around the outer periphery of the first magnet 45. The second magnet 51 is attached to the case inner wall 4
7 by molding.

With the above configuration, when a car collides with something at a certain deceleration, the first magnet 45 and the second magnet 51
The first magnet 45 is repelled against the attractive force of the sliding member 4.
6 compresses the coil spring 49. And the first magnet 4
5, the rM moving member 46 extends around the sleeve 42 at W1.
When the first magnet 45 is located near the contact point of the reed switch 12, the switch is turned on. Thereafter, the sliding member 46 is positioned within the movement suppressing member 50, and the outer circular end portion 52 of the first magnet 45 comes into contact with the movement suppressing member 5o, so that the movement of the first magnet 45 is suppressed, and the coil spring 49 and the attractive force between the first magnet 45 and the second magnet 51 to return to the original state.

(The switch is turned OFF) In FIGS. 1 to 3, 53 is silicone rubber for fixing the reed switch 12, 27.degree. 41.

As described above, in the first embodiment of the present invention, the spring pressure of the coil spring 20 causes the magnet 17 to move toward the bias adjustment member 21.
A bias adjusting member 21 is placed behind the magnet 17.
Since the iron plate 23 that can attract the magnet 17 via the iron plate 23 is disposed, when a collision exceeding a certain level occurs, the magnet 17 moves against the attraction force between the magnet 17 and the iron plate 23, and the magnet 17 Since the coil spring 20 is pressed, the magnet 17 will not move if the brakes are applied intermittently or the vehicle is driven on a rough road. In addition, since the magnet 17 is not directly slid, and the sliding member 16 is made of a material with relatively good sliding properties, such as Duracon, the sliding performance is extremely good.

In the second embodiment, the magnet 29 is attached to the leaf spring member 30. A bending portion 37 is provided, and an iron plate 40 for attracting the magnet 29 is provided behind the magnet 29, so that when a collision of a certain level or more occurs, the attraction force between the two magnets and the iron plate 40 is reduced. The magnet 29 moves against the
Since the magnet 29 moves near the contact point of the reed switch 27 due to the deflection of the magnet 29, the magnet 29 will not be moved due to intermittent braking or driving on a rough road.

In the third embodiment, the first magnet 45 is arranged around the outer periphery of the reed switch 41 via the coil spring 49, and the second magnet 47 is arranged around the outer periphery of the first magnet 45. Using the repulsive force of the second magnet, the coil spring 49
The magnet 29 will not move due to intermittent braking or driving on rough roads.

Incidentally, it is also possible to use an iron plate or the like instead of the second rIj1 stone.

〔Effect of the invention〕

Therefore, in the first means of the present invention, the magnet moves against the attraction force between the magnet and the attraction member, and the movement of the magnet presses the coil spring, so that the magnet does not move due to low-speed collision or resonance of the coil spring. A highly reliable collision detection switch device can be obtained.

In the second method, the magnet moves against the attractive force between the magnet and the metal member, and the magnet moves due to the deflection of the flexible part, so the magnet does not move due to low-speed collisions or resonance of the coil spring, resulting in high reliability. A collision detection switch iil can be obtained.

In the third means, since the coil spring is pressed against the attraction force between the magnet and the attraction member, the magnet does not move due to low-speed collisions or resonance of the coil spring, making it possible to obtain a highly reliable collision detection switch device. can.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of the collision detection switch device of the present invention, FIG. 2(a) is a sectional view of main parts showing a second embodiment of the collision detection switch device of the present invention, (b) is a plan view showing the leaf spring member of FIG. 2(a), FIG. 3 is a sectional view of main parts showing a third embodiment of the present invention, and FIG. 4 is a main part showing a conventional collision detection switch device. FIG. 12.27.41...Reed switch 13.42...
・Sleeve (protective member) 17.29... Magnet 20.49... Coil spring 21... Bias adjustment member (magnet contact member) 23.4
0... Iron plate (attraction member) 30... Leaf spring member 31... Magnet fixing part 34... Outer peripheral part 37... Flexible part 45... First magnet (11 stones) 51...・Second magnet suction member) 53... Silicone rubber (reed switch fixing means) No. 11a Fig. 2 (a) (b) Fig. 3 Fig. 4

Claims (3)

[Claims] (1) Includes a reed switch, a protective member arranged to surround the reed switch, and a magnet arranged around the outer periphery of the protective member via a coil spring, and the magnet moves against the spring pressure of the coil spring. In a collision detection switch device configured to turn on a reed switch, the magnet is brought into contact with a magnet abutting member by the spring pressure of a coil spring, and an absorber is provided behind the magnet to attract the magnet via the magnet abutting member. A collision detection switch device characterized by arranging members. (2) It is equipped with a reed switch, means for fixing the reed switch, and a magnet arranged to surround the reed switch, and the reed switch is turned on by the movement of the magnet.
In the push button switch having the configuration N, the magnet is fixed to a leaf spring member, and the leaf spring member has a magnet fixing part in the center capable of fixing the magnet, an outer peripheral part fixed inside the case, and these magnet fixing parts. and a plurality of flexible parts that connect the outer peripheral part and make the magnet fixing part movable using the outer peripheral part as a fulcrum, and an absorbing member that attracts the magnet is provided at the rear of the leaf spring member. Collision detection switch device. (3) A reed switch, a protection member arranged to surround the reed switch, and a magnet arranged around the outer periphery of the protection member via a coil spring, and the magnet moves against the spring pressure of the coil spring. 1. A collision detection switch device configured to turn on a reed switch, characterized in that an absorbing member for attracting the magnet is disposed around the outer periphery of the magnet.