Measuring and testing – Fluid pressure gauge – Mounting and connection
Reexamination Certificate
1999-01-05
2001-02-27
Oen, William (Department: 2855)
Measuring and testing
Fluid pressure gauge
Mounting and connection
Reexamination Certificate
active
06192762
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to air cylinders, and more specifically to a pressure gauge protection arrangement for an air cylinder.
A regular air cylinder
8
which holds a compressed gas for example oxygen, acetylene, ammonia, argon, etc., as shown in
FIG. 12
, is provided with a pressure regulator
9
for regulating the pressure of output gas for a safety application. The pressure regulator
9
, as shown in
FIGS. 13 and 14
, comprises a base
91
having an inlet pipe
911
and an outlet pipe
912
at two opposite sides. Two pressure gauges
92
are mounted on the base
91
at the top side for detecting the pressure of input gas and the pressure of output gas respectively. A top cover
93
is covered on the base
91
, defining a pressure chamber. The top cover
93
has a tubular projection
931
, and a rotary knob
94
mounted on the tubular projection
931
for regulating the pressure of output gas. This arrangement has drawbacks. The pressure gauges
92
use front and back shells
921
and
922
to hold respective pressure sensors
923
, dials
924
, indexes
925
and glass plates
926
in place, and the shells
921
and
922
are fixedly fastened to respective coupling tubes
928
by screws
927
, which coupling tubes
928
are respectively connected to the base
91
. Because the shells
921
and
922
are made of a thin metal sheet by stamping, they tend to be deformed by an impact (see FIG.
15
), causing the pressure sensors
923
, dials
924
and indexes
925
of the pressure gauges
92
to be damaged. Because the pressure sensors
923
are sensitive, they tend to be damaged by an impact. In order to eliminate this problem, a metal shield may be installed and covered on the pressure gauges
92
for protection. However, when the metal shield is impacted, a stress is produced at the connecting area between the base
91
and the coupling tubes
928
, causing the coupling tubes
928
to be deformed or broken.
SUMMARY OF THE INVENTION
The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a pressure gauge protection arrangement for an air cylinder which effectively protects the pressure gauges of the air cylinder against impact. It is another object of the present invention to provide a pressure gauge protection arrangement for an air cylinder which is easy to install. It is still another object of the present invention to provide a pressure gauge protection arrangement for an air cylinder which causes a sense of beauty, and increases the value of the air cylinder. According to one embodiment of the present invention, the pressure gauge protection arrangement comprises a base integral with the body of an air cylinder, the base having an inlet pipe, an outlet pipe, and a plurality of mounting holes, at least one pressure gauge respectively connected to the base by a respective coupling tube for air pressure detection, a top cover fixedly mounted on the base at a front side, the top cover having a plurality of mounting holes respectively fastened to the mounting holes at the base by respective screw bolts, and a part integrated with a rigid shield covered on the at least one pressure gauge to protect the at least one pressure gauge against impact, the shield having at least one opening respectively disposed corresponding to the face of each of the at least one pressure gauge, a transparent cover plate respectively mounted in the at least one opening, and a back side covered with a back cover plate to protect the back side of each of the at least one pressure gauge against impact. Because the back cover plate is disposed in flush with the periphery of the base and the top cover after its installation and because the shield is integral with the top cover, the arrangement has a nice looking.
REFERENCES:
patent: 5524492 (1996-06-01), Frick et al.
patent: 5809974 (1998-09-01), Osakabe
patent: 5834652 (1998-11-01), Koshimizu
Oen William
Rosenberg , Klein & Lee
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