JP2002333378A - Tire pneumatic alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire pneumatic alarm which is low-cost and by which the state of a tire air pressure can be visually recognized simply and easily. SOLUTION: The tire pneumatic alarm is composed of an outer frame body which comprises a window in its upper part, a display body which is equipped at the inside of the outer frame body and which can be moved up and down, a pressure spring which gives a downward urging force to the display body, a cylinder which introduces an air pressure inside a tire, a piston which is equipped inside the cylinder and which is moved up and down due to a change in the air pressure, a valve-core pressure member which presses the valve core of a tire valve so as to open the tire valve and which introduces the air pressure into the cylinder, and a bellows which externally wraps the cylinder and the piston airtightly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire pressure alarm which is used by being attached to a base of a tire valve, and more particularly to a pressure alarm capable of visually confirming a decrease in tire pressure from the outside.

[0002]

2. Description of the Related Art Conventionally, as a method of measuring the air pressure of a tire, a method has been adopted in which an air pressure measuring instrument is fitted into a valve base provided at an air injection port of a tire or a tire tube for measurement. That is, a valve core is provided inside the valve base, and the valve is opened when the valve core is pressed. When the air pressure measuring device is fitted into the valve base, the valve core is pressed, and the air inside the tire is introduced into the air pressure measuring device to measure the air pressure.

There is also an apparatus for detecting a tire rotation speed by a sensor and measuring a decrease in tire air pressure.

[0004]

However, the method of measuring the air pressure using the above-mentioned conventional air pressure measuring device has the following difficulties.

[0005] First, the air pressure measuring device itself and the measuring device are expensive, and it is difficult for a general driver to carry it.

In recent years, many tire wheels are rich in decorativeness. However, such wheels are often provided with a valve base in a deep place, and it is often difficult to fit an air pressure measuring instrument.

Further, in the case of an automobile having a large number of tires such as a truck and a bus, it takes a considerable amount of time and labor to measure the air pressure of all the tires.

[0008] When the air pressure of the tire decreases, the tire ruptures, causing a serious traffic accident.

[0009] In addition, it is difficult to visually recognize that the tire pressure of a modern truck or bus is gradually decreasing. Further, in general, when the tire pressure is visually observed, the tire flatness (width of the tire) of a passenger car is reduced. And height ratio)
Are 65-45% series, and trucks are 7
Since there are many 0-60% series, it is difficult to determine whether the tire air pressure is normal by simple visual inspection.

It is an object of the present invention to provide a tire pressure alarm which is inexpensive and can easily and easily determine the state of the tire pressure.

[0011]

In order to solve the above-mentioned problems, a tire pressure alarm according to the present invention comprises an outer frame having a window at an upper portion thereof, and a display which is provided inside the outer frame and which can move up and down. A pressure spring that applies a downward biasing force to the display body, a cylinder that introduces air pressure in the tire, a piston that is provided in the cylinder and that moves up and down in accordance with fluctuations in air pressure, and a tire valve that is provided below the outer frame body. A valve core pressing member for pressing the valve core to open the tire valve to introduce air pressure into the cylinder, and a telescopic bellows for airtightly enclosing the cylinder and the piston. Hereinafter, how the present invention configured as described above works to solve the problem will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of the present invention.

The tire air pressure alarm according to the present invention is used by fitting the outer frame body 10 to a base of a tire valve. When the outer frame body 10 is fitted into the base of the tire valve, the valve core pressing member 14 presses the valve core provided in the valve base. Then, the valve opens, and the air pressure inside the tire is introduced into the tire pressure alarm according to the present invention.

The introduced air pressure is introduced into a cylinder 50 provided above the valve core pressing member 14. At this time, the pressure for pressing the piston 60 in the cylinder 50 becomes the same as the air pressure in the tire.

The upper end of the piston 60 presses the display 20 via the bellows 40. A pressing spring 30 is interposed between the outer frame 10 and the upper part of the display 20.

The pressing spring 30 applies an urging force to the display body 20 in a downward direction, and sets an initial setting value of the urging force to an appropriate value of the tire air pressure, for example, 2.0 to 2.4 kg for a passenger car. / Cm ² .

Then, when the air pressure in the tire decreases, the piston 60 descends, and the display body 20 is pressed downward and descends. The descending state of the display body 20 is visually recognized from the window 11 provided in the outer frame body 10, and the state of decrease in tire air pressure is confirmed.

As described above, since the present invention has a simple structure, it can be manufactured at a low cost. Further, once it is mounted on the valve base, it is easy and easy to check the tire pressure thereafter. Thus, it is possible to provide a tire pressure alarm capable of knowing the state of the tire pressure.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One preferred embodiment of the present invention will be described below with reference to the drawings.

The outer frame 10 is a hollow frame. In FIG. 1, the shape of the outer frame body 10 is a cylindrical shape at the lower part and a truncated cone at the upper part. However, the shape is not limited to this, and may be, for example, a cylindrical shape from the lower part to the upper part.

A thread 15 is provided at a lower portion of the outer frame body 10 so that it can be screwed to a valve base.
A partition plate 17 is provided inside the lower portion of the outer frame body 10.
The valve core pressing member 1 is located below the partition plate 17.
4 are provided.

The partition plate 17 is provided with an air introduction hole 12, and the air introduced from the air introduction hole 12 is introduced into the cylinder 50.

A piston 60 is provided in the cylinder 50. The piston rod 61 is in contact with the lower end of the display 20 via the bellows 40.

The cylinder 50 and the piston 60 are hermetically enclosed by the bellows 40. The bellows 40 is elastic. The lower edge 41 of the bellows 40 is
It is inserted and sandwiched between the partition plate 17 and the flange portion 16. The bellows 40 is for preventing the tire air pressure from leaking.

The display 20 is interposed above the bellows 40 so as to be in contact with the bellows 40. The display body 20 is provided with a locking recess 21, which is locked by loosely inserting the locking projection 18 provided on the outer frame body 10.

On the outer peripheral surface of the display 20, identification information for indicating a change in tire air pressure is described. As the identification information, a specific tire pressure may be displayed with a scale or may be color-coded to identify a decrease in the tire pressure. As a method of color-coding, for example, blue when the tire air pressure is within an appropriate range, yellow at a stage where the tire pressure has begun to deviate from the appropriate range, and red at a stage out of the appropriate range.

This identification information is visually recognized from the outside through the window 11 provided in the outer frame 10.

A pressing spring 30 is interposed between the upper end of the display 20 and the outer frame 10. The pressing spring 30 urges the display body 20 downward. The initial set value of the pressing force of the pressing spring 30 is a normal value of the tire air pressure, that is, 2.0 to 2.4 kg / cm ² for a tire for a passenger car, and 8.3 for a tire for a large vehicle such as a truck or a bus. 5-9.
It must be set to 5 kg / cm ² .

[0029]

Since the present invention has the above-described structure and has a simple structure, it can be manufactured at a low cost. Further, once it is mounted on the valve base, it is only necessary to visually confirm it thereafter. Thus, it is possible to provide a tire pressure alarm which can easily and easily know the state of the tire pressure.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of the present invention.

[Explanation of symbols]

10. Outer frame 11, Window 14, Valve core pressing member 20, Display 30, Pressing spring 40, Bellows 50, Cylinder 60, Piston

Claims (1)

[Claims] 1. A tire air pressure alarm which is used by being attached to a base of a tire valve, comprising: an outer frame body 10 having a window 11 on an upper part thereof; A pressure spring 30 for applying a downward biasing force to the body 20 and the display body 20; a cylinder 50 for introducing air pressure in the tire; a piston 60 mounted in the cylinder 50 and moving up and down with a change in air pressure; 10 is provided at the lower portion, and presses the valve core of the tire valve to open the tire valve, thereby reducing the air pressure to the cylinder 5.
A pneumatic alarm comprising: a valve core pressing member (14) for introducing into a cylinder (0);