JPS5937950Y2 - shock switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to an impact switch that operates upon receiving a constant impact.

This type of switch is used, for example, as a safety measure against accidents in automobiles and the like.

In other words, in the case where a car etc. causes a collision,
The impact generated by the collision activates this impact switch, which turns off the power or activates devices such as airbags and safety nets installed to protect the occupants.

Various improvements have been made to this type of impact switch in the past, but in general, when an acceleration of more than a chamber is applied to a hemispherical container with a switch mechanism at the bottom, the impact switch moves along the circumference of the container. A steel ball is housed in the container whose position within the container changes due to its inertia, and a switch is opened and closed by changing the position of the steel ball with respect to the container.

However, in an impact switch with such a structure, when the steel ball is subjected to a horizontal impact of a certain level or more, it moves along the inner peripheral surface of the container to open and close the switch.
Even if the steel ball is subjected to horizontal and vertical vibrations or a slight impact, the steel ball may come into contact with the bottom of the circumferential surface of the container, or
This causes a problem that a so-called chattering phenomenon occurs due to touching.

Further, in the impact switch configured as described above, unless the container housing the steel balls is inverted, the steel balls that have been moved due to the impact will return to their original positions immediately after the impact, returning the switch to its original state.

In other words, the steel ball is not maintained at the position moved by the impact for a certain period of time, and therefore the change in the open/closed state of the switch is also temporary.

Therefore, for example, an impact switch used in a car,
When a car has a collision, if you want to activate the impact switch and then turn off the power after the collision for the purpose of preventing a fire in the car, it is not possible to use only the impact switch with the above configuration. Unless some measure is taken, even if the power is once turned off due to an impact, the power will be turned on again immediately after the impact, resulting in a problem.

The purpose of the present invention is to prevent the switch from opening easily even when horizontal and vertical vibrations are applied, and to simultaneously perform the switch opening operation when a predetermined shock is applied. An object of the present invention is to provide an impact switch that maintains the changing state and operates when a component of the impact force in one direction is equal to or higher than a certain value.

The present invention will now be described in detail with reference to preferred embodiments illustrated in the drawings.

In the figure, 7 is a housing, la and lb are a pair of terminals (for example, plugs) fixed at predetermined positions on the wall of the housing, 2 is a conductive inertial body housed in the housing 7, and 4
is a compression spring means for supporting the inertial body 2.

The housing 7 is divided into housings 7a and 7 having the same shape.
The housing wall is approximately one upper wall 7c and four side walls 7e, 7j.

7 and one bottom wall 7g.

The inner surface of the upper wall 7c has one plane 7d, and the two side walls 7e and 7f have, as shown in FIG.
It is roughly dogleg-shaped and is symmetrical to the top wall 7c and bottom wall 7g, and the upper part of each inner surface is a flat surface 7h.
, 7i.

These planes 7h and 7i intersect with the plane 7d at a constant intersection angle α (obtuse angle).

These intersections are indicated by symbols C1 and C2.

In addition, the above-mentioned plane 7c. 7h and 7i do not necessarily have to be strictly flat planes in a geometrical sense, and may have some unevenness.

The pair of terminals 1a and lb have a roughly oval shape, and their lower sides 1e have two planes lc and ld that intersect with each other at an angle α.

And each terminal 1a. 1b is arranged so that each plane 1c is located inside the plane 7d of the housing wall, while each plane 1d is flush with the plane 7h or 71 of the housing wall, as best shown in FIG. Each upright part 1
f penetrates the upper wall 7c of the housing wall and projects to the outside.

Two planes 1c for each terminal 1a, lb. The corners formed by 1d are indicated by symbols C and C6.

Note that each terminal 1a, lb is connected to both poles of a power source E through a load.

While the pair of terminals 1a and lb are fixed contacts, the inertial body 2 acts as a movable contact, and is approximately rectangular, with its upper plane 2f being the plane of the housing wall. 7d and the flat surfaces 1c of the pair of terminals, it is urged upward by the compression spring means 4.

Therefore, the planes 7h, 7i of the housing wall of the inertial body 2
The side planes 2g and 2h facing each other intersect the plane 2f at an angle β (approximately 90°), and their corners C
3 and C4 are exactly in contact with each corner C5 and C6 of each terminal.

A hollowed out portion 2a having a U-shaped cross section and extending laterally is formed in the lower portion of the inertial body 2, and the upper portion of the compression spring means 4 is inserted into this hollowed out portion 2a.

The compression spring means 4 includes male and female capsules 4a that can be inserted and removed freely;
A compression coil spring 3 is inserted into the spring 4b.

As shown in FIG. 2, the upper and lower ends of the spring 3 are in pressure contact with an upper base 4c within the female capsule 4a and a lower base 4d within the male capsule 4b, respectively.

The upper end of the female capsule 4a is fixed through a pivot shaft 5, while the lower end of the male capsule 4b is fixed through a pivot shaft 6.

The side protruding ends of the upper pivot 5 are fitted into U-shaped notches 2e formed at the center of the legs 2b and 2c, respectively, formed on both sides of the hollowed out portion 2a of the inertial body 2, while the lower pivot The side protruding ends of 6 are fitted into a pair of U-shaped notches 9a and 9b formed in the lower wall 7g of the housing wall.

Note that the lower pivot 6 has a slit 6a at one end thereof, and this slit faces a hole 10 formed in the housing wall.

The configuration of the impact switch according to this embodiment is as described above, and its operation is as follows.

This shock switch is the one to which this switch is installed,
For example, when the automobile is in normal operation, the inertial body 2 is in the position shown in FIG.

That is, the inertial body 2 is urged upward by the compression spring means 4, and its upper plane 2f is pressed against the plane 1c of the terminals 1a, lb to open an electric circuit.

When a car starts, accelerates, or stops, an inertial force acts on the inertial body 2 to rotate it in the direction of the arrow X1 or X2.
The spring 3 in the compression spring means 4 prevents the spring from rotating.
The spring force is selected.

However, on the other hand, if a collision occurs while the car is running, the inertial body 2 resists the spring force of the compression spring means 4 and moves in the X1 direction with corner C5 of one terminal as a fulcrum, or corner C6. Rotates in the X2 direction as a fulcrum.

The direction of rotation is determined by how the switch is installed on the vehicle, and for example, if corner C5 is located in the forward direction of the vehicle, the switch will rotate in the direction of arrow X1.

In this case, the inertial body 2 first rotates while lowering the female capsule 4a relative to the male capsule 4b against the spring force of the spring 3 and swinging the compression spring means 4 about the pivot shaft 6.

Then, when the upper pivot 5 crosses the neutral line O passing through the lower pivot 6 and the corner C1, the compression spring means 4
is further rotated so that its plane 2g is brought into pressure contact with the plane 7C of the housing wall.

Once the inertial body 2 is displaced to this state, the state is maintained by the spring force of the compression spring means 4 even if the impact subsides.

Therefore, the inertial body 2 is in contact with one terminal 1a, but is not in contact with the other terminal 1b, thereby opening the electric circuit.

To return the inertial body 2 to its original state, for example, a screwdriver may be inserted through the hole 10 in the housing wall, its tip inserted into the slit 6a of the pivot 6, and the screwdriver may be rotated in a predetermined direction.

As is clear from the description of the embodiments above, the impact switch according to the present invention includes a conductive inertial body biased by compression spring means in the housing, and when the inertial body 2 receives an impact, one Since the switch rotates around the corner of the terminal as a fulcrum and maintains this rotational state so that it separates from at least one terminal, the switch will not open or close easily under normal acceleration or vibration, but it will not be subject to excessive shock. In such a case, the switch can be opened to cut off the power to the electrical circuit.

Therefore, this switch is not sensitive to normal acceleration or vibration, and is highly effective when used when it is desired to open an electric circuit due to an impact.

Furthermore, this switch consists of a small number of parts, such as a pair of terminals, a housing, a conductive inertial body, and a compression spring means, and has a structure in which the inertial body rotates about its corner and the corner of the terminal as a fulcrum in the event of an impact. Therefore, the structure is extremely simple and the manufacturing cost is low.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an impact switch according to an embodiment of the present invention, Figs. 2 and 3 are sectional views taken along the line ■-■ in Fig. 1, and sectional views taken along the line FIG. 2 is a sectional view similar to FIG. 2 showing the state. la, lb... terminal, 2... inertia body (2f, 2g. 2h... plane), 3... coil spring, 4...・Compression spring means (4a...
female capsule, 4b...male capsule), 5,6.
...Axis, 7...Housing (7a, 7
b...Divided housing, 7d, 7e. 71... plane), C1 to C6... corner.

Claims (4)

[Scope of utility model registration request] (1) At least two planes (first plane, second plane) that intersect with each other at a predetermined angle are formed on the inner surface of the housing wall, and a first terminal is provided at the corner formed by the first plane and the second plane of the housing wall. , a second terminal is fixed at a position a certain distance apart from the terminal on the first plane, and at least 2,000 planes (first plane, a conductive inertial body having an outer periphery (two planes), and one end of the compression spring means is pivotally connected within the housing to a position facing the first plane of the housing wall, while the other end is pivotally connected to the inertial body. The first plane of the inertial body is compressed into a pair of terminals, and the corner formed by the two planes of the inertial body is brought into contact with the corner formed on the first terminal. , resists the biasing force of the compression spring means, swings about the corner of the first terminal as a fulcrum, and the first plane moves away from the second terminal, while the second plane resists the biasing force of the compression spring means. An impact switch characterized in that the impact switch is brought into pressure contact with the second plane of the housing wall. (2) Utility Model Registration Scope of the Claim In the impact switch according to claim 1, the compression spring means is formed by inserting a compression coil spring into a male and female capsule which can be freely inserted and removed. It is characterized by a fixed axis. (3) Utility model registration In the impact switch according to claim 1 or 2, the housing wall has a third plane on its inner surface that intersects with the first plane and is symmetrical to the second plane. On the other hand, the inertial body described in "2" has a third plane on its outer periphery that intersects the first plane and is symmetrical to the second plane, and
The terminal is fixed to the corner formed by the first plane and the third plane of the housing wall. (4) Utility Model Registration Claims In the impact switch according to any one of claims 1 to 3, the housing wall has a hole at a predetermined position passing through the inside and outside, and a tool can be inserted through the chain hole. The device is characterized in that the inertial body and compression spring means which are in an abnormal position are returned to their original normal positions.