Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
1999-02-09
2001-07-24
Tyler, Cheryl J. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C417S413100, C417S470000, C092S071000, C074S060000
Reexamination Certificate
active
06264438
ABSTRACT:
BACKGROUND OF THE INVENTION
a) Field of the Invention
The present invention relates to a compact pump (reciprocating pump) which uses a diaphragm.
b) Description of the Prior Art
A conventional compact pump of this kind, for example a pump disclosed by Japanese Patent Kokai Publication No. Sho 62-291484, has a configuration shown in FIG.
1
.
In this conventional compact pump, a disk like driving plate
35
is mounted on a driving shaft
34
which is studded, at a predetermined inclination angle, to a crank base
33
which is fixed to an output shaft
32
of a motor
31
. Single or a plural cup like diaphragm sections
36
which has upward openings are disposed on an outer circumferential portion of the disk like driving plate
35
. In case of a pump which comprises a plurality of diaphragm sections
36
, the diaphragm sections are arranged at equal intervals along a circumference. A reference numeral
37
represents a cylindrical valve which is integrated, for example, with the diaphragm section
36
, a reference numeral
38
designates another valve, a reference numeral
39
denotes an inlet port and a reference numeral
40
represents an exhaust port.
When the output shaft
32
is rotated by driving the motor
31
in the compact pump, the crank base
33
are rotated and the driving shaft
34
is moved like a gooseneck, whereby roots
36
a
of the diaphragm sections are moved up and down. Accordingly, a cup like diaphragm
36
which is located on the left side in
FIG. 1
is raised from a position where its root is lowered, whereas a diaphragm
36
which is located on the right side is lowered from a position where its root
36
a
is raised.
As the roots of the diaphragms
36
are moved up and down, the diaphragms suck and exhaust a fluid definite time intervals, thereby causing a pumping function.
In order to cause ideal reciprocal movements of the diaphragms
36
in the conventional compact pump described above, a center A of the driving shaft
35
which is located between the two diaphragm sections
36
must be aligned with a center axis of the output shaft. In other words, the center A must be located on an extension of the output shaft
32
. In order to align the center A with the center axis of the output shaft
32
, the driving shaft
34
must be equipped with a bearing, thereby prolonging the driving plate
35
and enlarging the pump as a whole.
Furthermore, a rotation of the output shaft
32
causes a reciprocal movement of a driven portion of the diaphragm
36
. When a rotating frequency of the motor is enhanced to rotate the output shaft at a higher speed, the pump allows the diaphragm sections
36
to be abnormally deformed, thereby extremely shortening service lives of the diaphragms. Accordingly, the pump requires a large motor which exerts a strong force.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide a compact pump comprising at least a pump chamber, an inlet port which is communicated with the pump chamber by way of a check valve, an exhaust port which is communicated with the pump chamber by way of another check valve, a driven body which is reciprocally moved in a section of the pump chamber to change a capacity of the pump chamber and a driving mechanism which reciprocally moves the driven body, wherein the driving mechanism comprises a driving plate which has a first annular groove and fixes the driven body, a rotating plate which is fixed to an output shaft of a motor, surrounds the output shaft and has a second annular groove formed at a location corresponding to the first annular groove, and a ball which is placed (sandwiched) between the first groove and the second groove, and wherein the ball revolves between the first annular groove and the second annular groove to change an inclined direction of the driving plate when the motor is driven and the change of the inclined direction causes a reciprocal movement of the driven body to increase or decrease a capacity of the pump chamber, thereby performing a pumping function.
Another object of the present invention is to provide a pump comprising a diaphragm which has at least a cup like diaphragm section, a pump chamber which is formed in the diaphragm section, an inlet port which is communicated with the pump chamber by way of a check valve, an exhaust port which is communicated with the pump chamber by way of another check valve, a driven body which is reciprocally moved in a section of the pump chamber to change a capacity of the pump chamber and a driving mechanism which reciprocally moves the driven body, wherein the driving mechanism comprises a driving plate which is pivoted by a driving plate shaft, has a first annular groove, and fixes the driven body, a rotating plate which is fixed to an output shaft of a motor, surrounds the output shaft and has a second annular groove formed at a location corresponding to the first annular groove, and a ball which is sandwiched between the first annular groove and the second annular groove, wherein an inclined direction of the driving plate is changed by a movement of the ball between the first annular groove and the second annular groove which is caused when the motor is driven and the change of the inclined direction a reciprocal movement of the driven body which causes a reciprocal movement of the driven body to change a capacity of the pump chamber, thereby performing a pumping function, and wherein the driving plate of the driving mechanism is hinged by the driving plate shaft at a location apart from the pump chamber.
Still another object of the present invention is to provide a pump comprising at least a pump chamber, an inlet port which is communicated with the pump chamber by way of a check valve, an exhaust port which is communicated with the pump chamber by way of another check valve, a piston which is reciprocally moved in a section of the pump chamber to change a capacity of the pump chamber and a driving mechanism which reciprocally moves the driven body, wherein the driving mechanism comprises a driving plate which has a first annular groove and fixes the driven body, a rotating plate which is fixed to an output shaft of a motor, surrounds the output shaft and has a second annular groove formed at a location corresponding to the first annular groove, and a ball which is sandwiched between the first annular groove and the second annular groove, and wherein an inclined direction of the driving plate is changed by a ball which revolves between the first annular groove and the second annular groove when a motor is driven and the change of the inclined direction causes a reciprocal movement of the piston to change a capacity of the pump chamber, thereby performing a pumping function.
REFERENCES:
patent: 4153391 (1979-05-01), Hartley
patent: 4396357 (1983-08-01), Hartley
patent: 54-111112 (1979-08-01), None
patent: 62-291484 (1987-12-01), None
patent: 06147128 (1994-05-01), None
Ohken Seiko Co., Ltd.
Pillsbury & Winthrop LLP
Tyler Cheryl J.
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