Rotary expansible chamber devices – Positively actuated vane – Fluid biased
Reexamination Certificate
2001-01-17
2002-08-20
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Positively actuated vane
Fluid biased
C418S266000, C418S267000
Reexamination Certificate
active
06435852
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a rotary having a pivotable member connected to the rotor so that the pivotable member extends to contact the inner periphery of the casing and is folded according to the position of the rotor in the casing.
BACKGROUND OF THE INVENTION
A conventional rotary pump is shown in
FIGS. 1 and 2
and generally includes a casing
11
with a cylindrical space
12
in which a rotor
13
is rotatably received. The rotor
13
has a shaft
10
connected to a center thereof and the shaft
10
is driven by a proper mechanism so as to let the rotor
13
rotate within the cylindrical space
12
. Two passages
14
,
140
are respectively defined radially in the rotor
13
and two plates
15
,
150
are respectively received in the two passages
14
,
140
. When the rotor
13
rotates, the two plates
15
,
150
are pushed outward to contact the inner periphery defining the cylindrical space
12
by eccentric force. By this way, the liquid in the room between the inner periphery defining the cylindrical space
12
and the rotor
13
can be pushed by the plates
15
,
150
from the outlet
122
. Liquid enters the room from the inlet
121
because the lower pressure in a partition in the room. However, the plates
15
,
150
cannot snugly contact the inner periphery of the cylindrical space
12
as expected so that the efficiency is low.
The present invention intends to provide a rotary pump having a pivotable pushing assembly which can be received in recesses in the rotor or extended to contact the inner periphery of the casing.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a rotary pump comprising a casing having a rotator rotatably received therein and a shaft fixedly extends through the rotator. The shaft is located eccentrically in the casing. A receiving area is defined longitudinally in an outer periphery of the rotator. An inlet and an outlet are defined through the casing. A pushing assembly has an end pivotally received in the receiving area and the other end of the pushing assembly rotatably contacts an inner periphery of the casing.
The primary object of the present invention is to provide a rotary pump wherein a pushing assembly is pivotally connected to the rotator and an end of the pushing assembly air-tightly contacts the inner periphery of the casing so as to obtain a high efficient pumping feature.
These and further objects, features and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, several embodiments in accordance with the present invention.
REFERENCES:
patent: 49070 (1865-08-01), Bickford
patent: 3886764 (1975-06-01), Edwards
patent: 4990074 (1991-02-01), Nakagawa
patent: 05-118282 (1993-05-01), None
patent: 1707240 (1992-01-01), None
Denion Thomas
Trieu Theresa
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