JPH06239115A - Air pressure detecting device of tire - Google Patents

Abstract

PURPOSE:To detect the inner air pressure of a tire by the visual recognition on the outer surface. CONSTITUTION:In a cylindrical body 1 installed to the rim 18 of a tire through packings 21 and 21' to communicate to the inside of the tire, a light emitting diode 13 and a button form battery 10 are installed, and when the inner pressure of the tire is reduced lower than a prescribed inner pressure to be less than a safety tolerable inner pressure by the operation of a piston 3 in a cylindrical body 1, the light emitting diode 13 is operated and the inner pressure reduction of the tire can be detected visually by its light emission. When the inner pressure of the tire is increased and restored to the prescribed pressure, the light emissing diode 13 is to be put out, and the system is composed to give a preset differential pressure to put on and put out the light of the light emitting diode by the variation of the inner pressure of the tire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved structure of an apparatus for observing tire pressure on a tire surface.

[0002]

2. Description of the Related Art Heretofore, there has been no known tire air pressure detecting device capable of visually checking the tire air pressure on the tire surface. For this reason, conventionally, the air pressure inside the tire cannot be known unless the pressure gauge is applied to the inner valve (commonly known as insect), and if the measurement is neglected, the vehicle will run below the specified pressure, which may lead to an accident. was there. Therefore, the applicant has invented a device that can detect whether the internal pressure of a tire is as specified or below specified by only visually recognizing light on the tire surface without measuring the tire air pressure one by one. A patent application has been filed as No. 4-146708.

The invention relating to this patent application is designed such that a light emitting diode and a button type battery are mounted in a cylindrical body attached to the rim of the tire via a packing so as to communicate with the inside of the tire, and the piston in the cylindrical body operates. By this, the light emitting diode works when the internal pressure of the tire decreases below the specified internal pressure,
You can see the decrease of the internal pressure in Thailand by the light. Further, the light emitting diode is configured to be extinguished when the internal pressure of the tire is restored to the specified internal pressure by supplementation, and the object of the application has been achieved.

[0004]

However, in the invention according to the above-mentioned patent application, when the internal pressure of the tire is less than the specified internal pressure and the light-emitting diode emits light, the piston immediately operates, The light emitting diode goes out in synchronism with the operation. That is, there is a possibility of causing a phenomenon such that the light emitting diode emits light or goes out near the specified internal pressure of the tire. For this reason, the light emitting diode is extinguished when the internal pressure of the tire is at the specified internal pressure, and the light emitting diode emits light if the pressure is reduced to below the safety allowable internal pressure set in advance, or the light emitting diode becomes Extinguish. As described above, the present invention aims to improve by visually recognizing the light of the light emitting diode from the outside so that it can be confirmed whether the internal pressure of the tire has been reduced to the specified internal pressure or less than the safe allowable internal pressure.

[0005]

A tire pressure detecting device of the present invention has a light emitting diode and a button type battery mounted in a cylindrical body attached to a rim of a tire via a packing so as to communicate with the inside of the tire. By operating the piston in the cylinder, the light emitting diode works when the internal pressure of the tire decreases below the specified internal pressure, and the decrease in the internal pressure of the tire is observed by the light. Configure to quench. Further, a pair of upper and lower crown-shaped conductors and disc-shaped conductors are attached to the piston, and the crown-shaped conductors and the disc-shaped conductors are separated when the tire internal pressure is the prescribed internal pressure, and the tire internal pressure is prescribed. When the pressure is lower than the internal pressure, a constant gap is created between the disc-shaped conductor and the coronal conductor so that the disc-shaped conductor (separate from the piston) operates with the coronal conductor (same as the piston). The light emission and quenching of the light emitting diode are controlled by maintaining the pressure.

[0006]

When the air pressure of the tire falls below the specified pressure, the spring attached to the lower part of the cylindrical body springs to lower the piston. As the piston descends, the coronal conductor also descends,
It approaches the disc-shaped conductor and finally comes into contact with it. Further, the crown-shaped conductor and the disc-shaped conductor are interlocked with each other, and when they come into contact with the inner wall of the cylindrical body, the light emitting diode emits light. By visually observing this light emission, it can be inspected on the surface of the tire that the air pressure of the tire has been reduced below a specified value. Further, when the tire air pressure is restored to the specified internal pressure by supplementation, the crown-shaped conductor is separated to a certain distance while the disc-shaped conductor is in contact with the inner wall of the cylindrical body by the operation of the piston. The coil spring conductor keeps the energized state between these two, and the light emitting diode is in the light emitting state. At this time, the tire internal pressure becomes approximately the specified pressure, and when the piston is actuated, the C-shaped cylindrical insulator is lifted by the shoulder of the piston part, and when the disc-shaped conductor is separated from the inner wall of the cylindrical body, the light emitting diode turns off. It is possible to visually confirm the completion of pressure compensation.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a tire air pressure detection device according to the present invention in a prescribed pressure state, and FIG. 2 is a sectional view of the depressurized state thereof, in which 1 is a metal cylinder, and the inner lower half of the cylinder 1 is shown. A piston 3 is attached to the portion so as to be biased by a spring 2. A small diameter portion 4 is continuously provided at the tip of the piston 3 facing the upper half of the cylindrical body 1, and a C end is provided at the base end of the small diameter portion 4.
The insulator 5 having a cylindrical shape is fitted in and the outer peripheral surface of the insulator 5 is brought into contact with the inner wall 6 of the cylinder 1.

A disk-shaped conductor 7 is attached to the small-diameter portion 4 of the piston 3 so as to abut on the tip of a C-shaped cylindrical insulator 5, and the conductor 7 is cylindrical as the piston 3 descends. I try to contact 1. Further, the small diameter portion 4 of the piston 3
By fixing a coronal conductor 8 to the tip of the disc-shaped conductor 7,
The coil-shaped conductor 8 interposes the coil spring conductor 9. Then, the button-type battery 10 is attached to the upper surface of the crown-shaped conductor 8, and the coil-shaped conductor 11 is connected to the button-type battery 10. Further, the insulating substrate 12 is attached to the upper end of the cylindrical body 1, and the light emitting diode 13 is installed on the insulating substrate 12. The light emitting diode 13 is connected to the cylindrical body 1 and the coil-shaped conductor 11 via terminals 14 and 14 '.

The light emitting diode 13 is detachably attached to the upper end of the cylindrical body 1 so that it can be seen through the transparent cap 15 whether light is emitted or not. A plurality of O-rings 16 are loaded and sealed between the cylindrical body 1 and the piston 3, and a retaining ring 17 for the piston 3 is provided at the lower end of the cylindrical body 1.

Reference numeral 18 is a rim of the tubeless tire 19, and packings 21 and 2 are provided in through holes 20 formed in the rim 18.
The air pressure detecting device A of the present invention is attached to the tire 19 and is used by being fitted into the lower portion of the cylindrical body 1 via 1'and tightening the double nut 22 to the lower end of the cylindrical body 1 on the lower surface of the rim 18.

In the air pressure detecting device A of the present invention mounted on the tire 19 in this way, when the tire 19 is in the inflated condition, the piston 3 is in the raised position as shown in FIG. And the coronal conductor 8 are separated from each other,
Further, the disk-shaped conductor 7 is separated from the inner wall 6 of the cylindrical body 1 by the C-shaped cylindrical insulator 5 and is not electrically connected, so that the button-type battery 10 and the light emitting diode 13 are kept in a non-energized state to emit light. The diode 13 does not emit light.

When the air pressure of the tire 19 becomes lower than a specified pressure, the piston 3 descends due to the urging force of the spring 2, and as the piston 3 descends, the disk-shaped conductor 7 and the crown-shaped conductor 8 are moved. Come close to each other and finally come into contact with each other, and the disk-shaped conductor 7 and the crown-shaped conductor 8 are connected to each other by the small-diameter portion 4 of the piston 3.
In conjunction with this, the C-shaped cylindrical insulator 5 is pushed down, comes into contact with the inner wall 6 of the cylindrical body 1, and the light-emitting diode 13 is energized to emit light through the coil-shaped conductor 11. This light emission can be viewed on the surface of the tire 19 through the transparent cap 15.

Therefore, when the light emission of the light emitting diode 13 is inspected, the tire 19 is replenished with air. The air pressure is increased by supplementing the air, and the piston 3 compresses the spring 2 so that the crown-shaped conductor 8 and the disk-shaped conductor 7 are separated by a certain distance. At that time, the disk-shaped conductor 7 and the inner wall 6 of the cylindrical body 1
Are in contact with each other, and the light emitting diode 13 is emitting light.
As the air continues to be replenished and the shoulder of the piston 3 pushes up the C-shaped cylindrical insulator 5, the disk-shaped conductor 7 becomes the cylindrical body 1.
The electric current to the light emitting diode 13 separated from the inner wall 6 is cut off and the light emitting diode 13 is extinguished. The extinction can be inspected and the completion of the pressure compensation of the tire 19 can be known. The light emitting diode 13 is not caused to emit light until the air pressure of the tire 19 is reduced from the specified internal pressure to the set pressure.

[0014]

As described above, the tire air pressure detecting device of the present invention is always used by being attached to the rim of the tire. When the light emitting diode does not emit light, the tire internal pressure is a safe allowable internal pressure, and When the diode emits light, the internal pressure of air is reduced to within the safe allowable range. This can be easily and surely detected by visual inspection from the surface of the tire. In addition, even when air is replenished, it is not necessary to measure with a pressure gauge or the like because it is possible to inspect from the surface of the tire that the internal pressure has reached the specified level due to the extinction of the light emitting diode. Further, since the light emitting diode is robust and consumes less power, it is possible to improve the durability and long life of the light emitting diode and the button type battery.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a device of the present invention in a specified pressure state.

FIG. 2 is a vertical cross-sectional view of the device of the present invention in a reduced pressure state.

FIG. 3 is a perspective view of a use state of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical body 3 Piston 10 Button type battery 13 Light emitting diode 18 Rim 19 Tire 21,21 'Packing

Claims (1)

[Claims] 1. A light emitting diode and a button type battery are mounted in a cylindrical body attached to a rim of the tire via a packing so as to communicate with the inside of the tire, and an internal pressure of the tire is controlled by operating a piston in the cylindrical body. The light emitting diode works when the pressure is reduced by a set pressure from the specified internal pressure, and the decrease in the internal pressure of the tire can be inspected by the light, and the light emitting diode is configured to be extinguished when the internal pressure of the tire is restored to the specified pressure by compensating. A tire air pressure detection device characterized in that it is configured to give a preset differential pressure to light emission / extinction of a light emitting diode due to a change in internal pressure.