JPS6010256Y2 - inertia switch - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an inertial switch that detects acceleration.

Inertia switches are used, for example, when a car encounters an accident such as a collision, fall, or rollover, to detect acceleration due to the impact and activate a safety device.

Specifically, the inertia switch according to the present invention can be used in the event of a car accident where an injured passenger is unable to unlock the door locking device by himself or herself.
The automatic unlocking mechanism of the door lock device allows the door to be opened quickly using the external handle after an accident, in order to prevent occupants from being trapped inside the vehicle and delaying rescue from the outside. It is used as a detection means.

Conventional inertia switches are those in which a magnetic inertia actuating member is attracted to a magnet, and when an acceleration of a predetermined level or more is applied, the inertia actuating member escapes the attractive force of the magnet and uses the momentum to operate the switch. existed.

However, in this conventional inertial switch, the inertial actuating member is limited to a magnetic material, and the attractive force of the magnet is merely used to detect acceleration.

In the present invention, the inertial actuating member is not limited to a magnetic material, and in order to effectively utilize the attractive force of the magnet, when operating the switch with the switching member, the two states of disconnection and connection are made using the attractive force of the magnet. The present invention provides an inertial switch configured to hold.

The present invention will be explained below with reference to embodiments shown in the drawings.

As shown in FIGS. 1 to 5, the casing 2 forming the outer shell of the inertia switch 1 is composed of a first casing 21 and a second casing 22, each of which has a shape of a funnel that expands upward. A first receiving part 24 and a second receiving part 25 are formed, and the first casing 21 and the second casing 22 are combined to form a casing 2 having a funnel-shaped receiving part 23.

A switching member 3 is held on the mating surfaces of the first casing 21 and the second casing 22 so as to be slidable in the vertical direction.
1 is provided, and a spherical inertial actuating member 4 is housed here between the opposing part 31 and the receiving part 23, and the inertial actuating member 4 rises along the slope of the receiving part 23 or directly above it. When it does so, it hits the opposing part 31 and pushes it upward.

The opposing portion 31 can be formed into a disk shape, a simple protrusion, or the like as necessary.

Terminals 26, 27 and magnets 5 are fixedly installed below the casing 2, and a hole 35 corresponding to the movement stroke is formed at the bottom of the switching member 3. At the upper and lower ends of this hole 35, the switching member 3
An upper attraction member 32 that is attracted to and held on the upper surface of the magnet 5 in the lower position, and a lower attraction member 33 that is attracted and held on the lower surface of the magnet 5 in the upper position are fixedly installed. By being held, the switching member 3 is always held at either the upper position or the lower position.

Note that it is preferable that the magnet 5 and each attraction member 32, 33 not come into direct contact with each other in order to prevent damage to the magnet 5.
The upper suction member 32 is positioned with a slight gap therebetween.

The lower suction member 33 is electrically conductive and contacts the terminals 26 and 27 to make them conductive, thereby forming a switch. It stands out.

The operation of the inertia switch 1 will be explained with reference to FIG. 6. As shown in FIG. It is accommodated between the upper facing portion 31 and the upper facing portion 31 .

The opposing portion 31 and the inertial actuating member 4 do not need to be in contact with each other.

In this state, the upper attraction member 32 is attracted to the magnet 5 and cannot escape the attraction force unless abnormal acceleration is applied to the inertia switch 1.

Since the terminals 26 and 27 are separated from the lower suction member 33, they are in the disconnected state as a switch.

When abnormal acceleration is applied to the inertial switch 1, the inertial actuating member 4 tends to move laterally if the acceleration is in the lateral direction, but because of the receiving portion 23, it rises along the slope thereof.

If the acceleration is downward, the inertial actuation member will try to rise directly.

As a result, as shown in FIG. 6, the inertial actuating member 4 hits the opposing portion 31 and raises it, thereby raising the entire switching member 3.

Then, the upper attraction member 32 releases the attraction force of the magnet 5, and the lower attraction member 33 is attracted to the lower surface of the magnet 5.

Terminals 26 and 27 are held between the magnet 5 and the lower attraction member 33, and the terminals 26 and 27 are held by the lower attraction member 33, which is a conductor.
27 is electrically conductive and is in a connected state as a switch.

Due to the attractive force of the magnet 5, the lower attracting member 33 attracts the terminals 26, 2.
7 and is securely held in pressure contact.

The switching member 3 is returned to its original state by a return operation member 34 as a return mechanism.
This can be easily done by pushing downward.

In this embodiment, the lower suction member 33 is connected to the terminals 26 and 27.
The switch is brought into contact with the top surface of the magnet and the upper suction member 32.
A terminal may be provided between the switch and the switch to change from the connected state to the disconnected state.

Even in this case, the switch is reliably held by the attractive force of the magnet.

Furthermore, it may be an independent switch that is held by the attraction force of a magnet without using an attraction member.

Furthermore, the same effect can be obtained by fixing the magnet to the switching member 3 and providing the upper suction member and the lower suction member to the casing 2, and the mounting position is not limited to the lower part of the casing.

Two magnets may be used, and the upper suction member and the lower suction member may be arranged in sets at separate locations.

Further, the receiving portion 23 may have a funnel-shaped groove only in cross section.

However, in this case, the directions in which acceleration can be detected are limited.

Further, the return operation member 34 may be operated by providing an operation hole in the casing 2 without protruding outside the casing 2, and may be built into the casing 2.

Most of the switching member 3 can be housed in the casing 2, and if the part where the inertial actuating member 4 operates is separated from the other parts, it is convenient to prevent dust.

According to the present invention, the attraction force of the magnet is effectively used to detect acceleration to ensure reliable switch operation, and the return operation is easy, so it can be used repeatedly, and can be used in control circuits of automobile safety devices. If it is installed in a device such as a device, the safety device can be operated accurately and reliably.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is an overall perspective view, Fig. 2 is a plan view, Fig. 3 is an exploded perspective view, Fig. 4 is a sectional view taken along line A-A in Fig. 2, and Fig. 5 The figure is a sectional view taken along the line BB in FIG. 2, and FIG. 6 is a sectional view taken along the line AA in FIG. 2 for explaining the operation. 1...Inertia switch, 2...Curved casing, 2
3... Receiving part, 26, 27... Bent terminal, 3...
...Switching member, 31... Opposing part, 32... Upward suction member, 33... Downward suction member, 34.
Bending/returning operation member, 4...Inertial operation member, 5.
Song/Magnet.

Claims (1)

[Scope of utility model registration request] A switching member having a facing part located opposite to the receiving part from above in a casing having a funnel-shaped receiving part that spreads upward, and housing an inertial actuating member between the receiving part and the opposing part,
It is held slidably in the vertical direction, and a magnet is fixed to either the switching member or the casing,
On the other hand, an upper suction member that is attracted above the magnet and a lower suction member that is attracted downward are attracted and held by the magnet so that the switching member is always held in either position. A switch that is fixedly installed, is connected or disconnected by vertical movement of the switching member, and is held in pressure contact with or disconnected by the attractive force of the magnet, and is capable of returning the switching member after it has been operated. An inertia switch comprising a return mechanism for the switching member having a return operation member projecting into position.