Pumps – Expansible chamber type – Valved piston
Reexamination Certificate
1999-10-22
2001-02-27
Walberg, Teresa (Department: 3742)
Pumps
Expansible chamber type
Valved piston
C415S189000, C092S107000
Reexamination Certificate
active
06193482
ABSTRACT:
BACKGROUND OF THE INVENTION
a) Technical Field of the Invention
The present invention relates to an improved structure of a piston for air-filing device by making use of air pressure formed as a result of the reciprocation action of piston within the cylinder to urge an air-tightness disc mounted at the top of the piston to close rapidly and to open instantaneously.
b) Description of the Prior Art
FIG. 6
shows a conventional piston structure of an air-filing device, which employs high temperature resistant, and wear-resistant TEFLON (trademark of a plastic that stops things from sticking to it) material as piston cylinder ring. As the TEFLON material is highly flexible, it can be easily mounted to the piston. Thus, in conventional piston, circular shape TEFLON is directly mounted at the external surface of the piston to use as a cylinder ring for air-tightness.
As shown in the conventional cylinder piston apparatus A
1
, after the TEFLON material wears out, minute gaps may form between the cylinder wall A
3
with the piston. Thus, air tightness cannot be obtained. If air leakage or the insufficient pressure is found in the air filing device, the entire air-filing device is damaged. This is one of the drawback of the conventional piston apparatus.
Furthermore, when the piston reciprocates within the cylinder, it is necessary to have an air-inlet valve apparatus A
4
, facilitating the entry of air, and then the air is compressed, and is formed into air pressure to be released. Other than the air leakage and insufficient air pressure as a result of wears of the TEFLON, the air inlet valve apparatus is also another drawback needed to be overcome. It is often that the air inlet valve body A
41
is deformed, worn out, or spring A
42
fatigue which cause a malfunction of opening or closing of the valve body. In particular, when an object enters and blocks the air inlet valve apparatus, the flowing of air is not smooth or the flowing-in air is insufficient. Thus, the drawbacks of the conventional air-filing device mentioned above have to be overcome.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an improved structure of a piston of an air-filing device, wherein the present apparatus not only solve the problem caused by the piston cylinder ring but also solve the problem caused by the air inlet valve apparatus.
Yet another object of the present invention is to provide an improved structure of a piston of an air-filing device, wherein no air inlet valve apparatus is required to achieve smooth air entry and to attain the required operation stroke for the piston.
It is another object of the present invention to provide an improved structure of a piston of an air-filing device, wherein the air entry, compression, and air discharging can be completed at the same time.
One aspect of the present invention is to provide an improved structure of a piston of an air-filing device comprising a pressure engaging ring, a top cylinder ring, an air-tightness disc, an air-tightness ring, a piston head body, a piston pin, a resilient ring, a positioning member, a bottom cylinder ring, and a linking rod, characterized in that the pressure engaging ring is used to secure the top cylinder ring onto the external edge of a protruded section located at the top of the piston head body; the top cylinder ring is made from TEFLON material and has a bottom lip edge section at the interior diameter thereof and is extended from the lower section of the exterior diameter thereof to form an inclined surface, the air tightness disc has a flat circular shape and has a center hole, and is used to pull and control the positioning member, the air-tightness disc is located at the protruded surface at the top of the piston head body so as to press and seal the air tightness ring, and close and seal at the air hole located at the protruded surface of the piston head body; the air-tightness ring is made from a rubber material and is retained at a recess provided at the top protruded surface of the piston head body to assure air-tightness capability at the circumference of the bottom edge of the air-tightness ring; the piston head body is provided with the top protruded section, and a recess is formed at the top surface of the protruded section, a plurality of air holes and center hole are provided within the recess; a bottom recess is provided below the piston head body; a resilient member having elasticity is mounted to the positioning member which is functioned together with the air-tightness disc with relation to pulling and controlling of the air-tightness disc; a positioning member is riveted to the air-tightness disc at the center hole; and bottom cylinder ring is made from TEFLON material as one piece and is used to engage at the bottom recess of the piston head body to form into an auxiliary second cylinder ring.
REFERENCES:
patent: 5191863 (1993-03-01), Hagiwara
patent: 5380175 (1995-01-01), Amarume
patent: 5993178 (1999-11-01), Park et al.
patent: 6015720 (2000-01-01), Roth
A & J
Campbell Thor
Walberg Teresa
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