Pumps – With muffler acting on pump fluid
Reexamination Certificate
2001-02-22
2002-11-26
Freay, Charles G. (Department: 3746)
Pumps
With muffler acting on pump fluid
C417S313000, C181S272000, C181S264000
Reexamination Certificate
active
06485270
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to air pump and more particularly to an air pump for a fish-tank with noise silence arrangement.
BACKGROUND OF THE INVENTION
A conventional air pump
10
for fish-tank is shown in
FIG. 1
comprising a body
11
, a cap
12
, a front vibration mechanism
13
secured to cap
12
having a magnet
131
at one side, a pair of check mechanisms
14
with body
11
sandwiched therebetween, and a rear plate
15
. Each of the components is detailed below. Body
11
comprises an inlet air chamber
111
with cap
12
clung onto, an outlet air chamber
112
divided from inlet air chamber
111
by a central wall, an inlet
113
, an outlet
114
both on the central wall, a first slot
115
in inlet air chamber
111
, a second slot
115
in outlet air chamber
112
wherein each check mechanism
14
is inserted in the corresponding slot
115
, a discharge opening
116
on the bottom of inlet air chamber
111
in communication with the external of body
11
, and a discharge pipe
117
on die side opposite to the discharge opening
116
. Check mechanism
14
comprises a diaphragm
142
and a block member
141
for pressing diaphragm
142
onto slot
115
for releasably covering inlet
113
(or outlet
114
). The rear side of body
11
is sealed by rear plate
15
.
Operation: When air pump
10
is activated, an activated external electromagnetic device (not shown) will reciprocally attract and repulse the magnet
131
, thus causing the magnet
131
to vibrate toward cap
12
about the other side of vibration mechanism
13
. Hence, cap
12
is reciprocally pushed and pulled. When cap
12
is pulled up, external air will suck into inlet air chamber
111
through discharge opening
116
. Then air is guided to outlet
114
through inlet
113
. To the contrary when cap
12
is pushed down, internal air will be compressed into outlet air chamber
112
through outlet
114
. Then the compressed air is discharged out of discharge pipe
117
. As a result, fresh compressed air may be pumped into water in fish-tank by the reciprocation of vibration mechanism
13
. However, the previous design suffered from a disadvantages, i.e., it is very noisy. This is because an air path within the air pump
10
(i.e., from inlet
113
to inlet air chamber
111
) is short, resulting in a quick discharge of air. Thus, it is desirable to provide an air pump with prolonged air path for effectively attenuating noise when air pump is operating, thereby overcoming the above drawbacks of prior art.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an air pump for a fish-tank comprising a base plate; a body comprising a frame, an inlet air chamber, an outlet air chamber divided by the frame, a first and a second inlets at the inlet air chamber, a first and a second outlets at the outlet air chamber, a slot on each of the first inlet and the first outlet, a discharge pipe, and a bottom casing comprising an air charge opening on the top in communication with outside, a compartmental air chamber assembly, an air charge tube extended down from the air charge opening to the compartmental air chamber assembly, the bottom end of the air charge tube urged against the inner wall of the base plate, and one or more third outlets on the edge of the bottom end of the air charge tube; a cap clung onto the frame; a vibration mechanism secured to the outer surface of the cap, the vibration mechanism comprising a magnet at one side; a pair of check mechanisms with the body sandwiched therebetween, each of the check mechanisms clung to the corresponding slot and comprising a block member and a diaphragm for regulating air passing through the first inlet and the first outlet; a pad clung to the rear side of the body; and a rear plate clung to the rear side of the pad; wherein air is guided into the air chamber assembly prior to leaving the discharge pipe. By utilizing such indirect air path in the air chamber assembly, noise generated while air pump is operating is greatly reduced.
It is another object of the present invention to provide an air pump for a fish-tank comprising a pair of base plates; a body comprising a frame, an inlet air chamber, an outlet air chamber divided by the frame, a first and a second inlets at the inlet air chamber, a first and a second outlets at the outlet air chamber, a slot on each of the first inlet and the first outlet, a discharge pipe, and a bottom casing comprising an air charge opening on the top in communication with outside, a pair of compartmental air chamber assemblies, an air charge tube extended down from the air charge opening to one of the compartmental air chamber assemblies, the bottom end of the air charge tube urged against the inner wall of one of the base plates, and one or more third outlets on the edge of the bottom end of the air charge tube; a pair of caps each clung onto the frame; a pair of vibration mechanisms each secured to the outer surface of each cap, each vibration mechanism comprising a magnet at one side; a pair of check mechanisms with the body sandwiched therebetween, each of the check mechanisms clung to the corresponding slot and comprising a block member and a diaphragm for regulating air passing through the first inlet and the first outlet; a pad clung to the rear side of the body; and a rear plate clung to the rear side of the pad; wherein air is guided into the air chamber assemblies prior to leaving the discharge pipe. By utilizing such indirect air path in the air chamber assemblies, noise generated while air pump is operating is further greatly reduced.
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: 3838944 (1974-10-01), Kolfertz
patent: 4170439 (1979-10-01), Hase
patent: 4762470 (1988-08-01), Wang
patent: 5137432 (1992-08-01), Tsai
patent: 5407330 (1995-04-01), Rimington et al.
patent: 6007307 (1999-12-01), Sonoda
patent: 6168392 (2001-01-01), Takano
patent: 6340069 (2002-01-01), Wang
patent: 11-247764 (1999-09-01), None
Freay Charles G.
Liu Han Lieh
Meiko Pet Corporation
Rosenberg , Klein & Lee
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