Pressure indicating device for a tire

Details Pressure indicating device for a tire Pressure indicating device for a tire

2001-10-29

2003-08-19

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

C073S146000

Reexamination Certificate

active

06606903

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to tires of motor vehicles and more particularly to a pressure indicating device for a tire of a motor vehicle with improved characteristics.
BACKGROUND OF THE INVENTION
A conventional valve
20
of a tube-less tire is projected from a rim
10
as illustrated in
FIGS. 1 and 2
. Valve
20
comprises a hollow cylindrical member
30
through rim
10
; a tube member
40
having a lower portion secured within a bore of hollow cylindrical member
30
and an upper portion with an outer threaded section
402
and an inner threaded section
401
; a channel member
50
having a narrow inner hole; a spring
80
; a cap
60
having an outer threaded section
601
; and an elongate slender bar
70
having a thin disk
701
on the lower part, with spring
80
anchored between the narrow inner hole of channel member
50
and a top of the elongate slender bar
70
. The elongate slender bar
70
is inserted through the channel member
50
and cap
60
until disk
701
is stopped by the bottom end of the channel member
50
which is in turn secured in tube member
40
. Also, threaded section
601
of cap
60
is secured to the inner threaded section
401
of tube member
40
. In inflating the tire, air is pumped into the tire through bores of cap
60
and channel member
50
by pushing down the elongate slender bar
70
by a needle (not shown) for disengaging disk
701
from the bottom end of the channel member
50
. In the mean time, a person can know the fullness of the tire by observing the pivoting of the pointer of a pressure gauge coupled to an air pump. When the tire is in use, the above air passage is dosed. Further, a person can only knock on the tire by hand or foot for generally determining fullness thereof by feeling its hardness or hearing its sound prior to driving. However, such technique is not reliable. Thus, the need for improvement still exists.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an apparatus mounted on a valve of a tire for indicating pressure of the tire. The apparatus comprises a pressure indicator including a downward pipe having an inner thread, a hollow downward cylinder projected into the pipe, the cylinder having a bottom opening, a mainspring having one end coupled to the cylinder, the mainspring being capable of pivoting as air passes through the bottom opening, a pointer coupled to the other end of the mainspring, and a scale. In a mounted state of the pressure indicator and the valve, the inner thread of the downward pipe is secured to the valve, and the cylinder is urged against the valve to form an air path from the tire to the mainspring through the valve and the bottom opening for pivoting the pointer.
It is another object of the present invention to provide an apparatus mounted on a valve of a fire for indicating pressure thereof. The apparatus comprises a pressure indicator including a cap having an inner thread threadably secured to the valve, a hollow downward cylinder projected into the cap and engaged with the elongate slender bar of the valve, the cylinder having a bottom opening, a spring on the cylinder to bias the hollow downward cylinder relative to the cap and away from the elongate slender bar, a mainspring having one end coupled to the cylinder, the mainspring being capable of pivoting as air passes through the bottom opening of the cylinder, a pointer coupled to the other end of the mainspring, and a scale. In a mounted state of the pressure indicator and the valve, the valve is closed when the hollow downward cylinder is not pressed against the bias of the spring. While the spring is compressed, the hollow downward cylinder moves the elongate slender bar to the open position to form an air path from the tire to the mainspring through the valve and the opening for pivoting the pointer.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.


REFERENCES:
patent: 4103549 (1978-08-01), Schmidt
patent: 4924697 (1990-05-01), Hunt et al.
patent: 5965822 (1999-10-01), Wu

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