Pumps – With muffler acting on pump fluid
Reexamination Certificate
1999-11-17
2001-07-10
Thorpe, Timothy S. (Department: 3746)
Pumps
With muffler acting on pump fluid
C417S413100, C181S229000
Reexamination Certificate
active
06257842
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a silencer and an electromagnetic vibrating type pump employing the same. More particularly, the present invention relates to a silencer incorporating therein an exhaust valve capable of switching an exhaust path through external air pressure and an electromagnetic vibrating type pump which is mainly employed for performing induction and exhaust of air for use in indoor air beds or air mattresses.
2. Description of the Related Art
A diaphragm type pump is an example of a conventionally known electromagnetic vibrating type pump wherein suction and discharge of fluid is performed by utilizing the vibrating force of a vibrator having permanent magnets, the vibration utilizing magnetic interaction between an electromagnet and permanent magnets. Such a pump is composed of two pairs of casings which support the diaphragm and simultaneously form a pumping chamber, a driving portion including a vibrator connected to the diaphragm and an electromagnets, a filter holding portion, and an air tank.
As shown in
FIG. 11
, whenever this pump
100
is utilized in an air bed B, air flowing in through suction inlet
101
is branched by discharge outlet
102
and is further introduced into air bags within a B
1
zone and a B
2
zone of the air bed B. For adjusting an amount of air to be introduced into each of the zones, there are respectively connected an ON/OFF type opening/closing valve
104
to each of branching paths
103
a
,
103
b
. In case operation of the pump
100
is terminated, air pressure is exerted on the B
1
zone as well as the B
2
zone. For this reason, there is provided another opening/closing valve
104
for emergency purposes between the branching paths
103
a and
103
b
such that the pressure can be adjusted by exhausting air within the B
1
zone as well as the B
2
zone. The provision of three opening/closing valves
104
and the necessity of connecting each of the opening/closing valves
104
for arranging the air bed B utilizing this pump
100
results in higher costs for arranging the same.
In an alternative bed arrangement shown in
FIG. 12
, the opening/closing valves
104
are replaced by two switching valves
104
which are provided with an air supply and exhaust mechanism. The number of valves used in such a bed arrangement is decreased by one so that valve-connecting operations can be performed easier. However, because the structure of the switching valves
105
are more complicated than those of the opening/closing valves
104
, costs for arranging such an air bed are still high due to the increased costs of the valves.
The present invention has been made in view of these circumstance and it is an object of the present invention to provide a silencer incorporating therein an exhaust valve capable of switching an exhaust path through external pressure, and to provide an electromagnetic vibrating type pump utilizing such silencer capable of simplifying connecting operations to objects such as air beds and thereby decreasing costs for arrangement.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a silencer assuming a shape of a sealed container in which an air reservoir is formed in a flow path from a suction inlet to a discharge outlet, wherein the air reservoir connected to the discharge outlet is provided with an exhaust valve mechanism for exhausting back-flowing air to the discharge outlet through external pressure.
In accordance with the present invention, there is further provided an electromagnetic vibrating type pump having the above silencer wherein a diaphragm that is connected to a vibrator is made to vibrate through electromagnetic vibration of the vibrator having permanent magnets by utilizing magnetic interaction between an electromagnet and the permanent magnets.
REFERENCES:
patent: 3741689 (1973-06-01), Rupp
patent: 4897890 (1990-02-01), Walker
patent: 5152579 (1992-10-01), Bishai
patent: 5583325 (1996-12-01), Schutte et al.
patent: 5888056 (1999-03-01), Kim
patent: 6007307 (1999-12-01), Sonoda
patent: 8-210258 (1996-08-01), None
Kawasaki Nozomu
Murayama Yasuhiro
Ohya Ikuo
Armstrong Westerman Hattori McLeland & Naughton LLP
Gray Michael K.
Techno Takatsuki Co., Ltd.
Thorpe Timothy S.
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