Pumps – Diverse pumps
Reexamination Certificate
2002-05-29
2004-04-20
Yu, Justine R. (Department: 3746)
Pumps
Diverse pumps
C417S041000, C417S118000, C417S148000, C137S202000, C137S365000
Reexamination Certificate
active
06722855
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an oil pumping device, and more particularly to an oil pumping device that includes a manual pumping mode and a pneumatic pumping mode.
FIGS. 7 and 8
show a conventional manual/pneumatic oil pumping device having a housing
81
. An oil reserving space
82
is defined in the housing
81
. A floating board
83
is disposed in the oil reserving space
82
. An upper cover
84
is disposed on the housing
81
. The upper cover
84
is equipped with a manual air sucking mechanism
7
, a pneumatic air sucking mechanism
6
and an oil sucking tube
85
.
The pneumatic air sucking mechanism
6
has an air incoming passage
61
communicating with an air pressure source. A rear end of the air incoming passage
61
has an outlet
62
. In addition, the air incoming passage
61
has an air sucking passage
63
communicating with the oil reserving space
82
. Several stop plates
64
are disposed in the air sucking passage
63
at intervals. A seat body
65
is disposed at bottom end of the air sucking passage
63
. A steel ball
66
is disposed in the seat body
65
. The bottom of the seat body
65
is formed with a through hole
651
. A leakproof ring
67
is positioned between the bottom of the seat body
65
and the steel ball
66
. In normal state, the steel ball
66
will drop due to its own weight to block the through hole
651
and disconnect the pneumatic air sucking mechanism
6
and the oil reserving space
82
from each other. Under such circumstance, the manual air sucking mechanism
7
is operable to suck air and pump the oil.
The manual air sucking mechanism
7
has an upright pump
71
in which a piston
72
is installed. The piston rod
73
of the piston
72
passes through the upper cover
84
and is provided with a handle
74
for a user to operate. The upper cover
84
is formed with an air incoming passage (not shown) communicating with the oil reserving space
82
and the interior of the pump
71
. The blocking/unblocking of the air incoming passage is controlled by a float
75
. After the oil in the oil reserving space
82
ascends, the float
75
is pushed to block the air incoming passage and prevent the oil from being sucked into the pump
71
.
The manual air sucking mechanism
7
includes a float
75
for blocking the air incoming passage. However, the pneumatic air sucking mechanism
6
lacks such design. In other words, when using the pneumatic air sucking mechanism
6
to suck air and pump the oil, in the case that the oil in the oil reserving space
82
ascends to the height of the seat body
65
, the oil will be sucked from the through hole
651
of the seat body
65
into the air sucking passage
63
and ejected from the outlet
62
.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a oil pumping device. A movable block is fitted in a sleeve of a controlling unit. The movable block has a downward projecting post. When the oil reserving space is filled up with oil, a floating board will ascend to push the projecting post so as to move the movable block upward. At this time, a leakproof washer of the movable block will seal a through hole of the seat body. Therefore, the oil in the oil reserving space is prevented from leaking.
It is a further object of the present invention to provide the above oil pumping device in which when the leakproof washer seals the through hole on the seat body, a push pin of the movable block pushes away a valve body from the through hole of the seat body. Therefore, the space between the leakproof washer and a silicone ring keeps communicating with the air sucking passage so as to avoid clog of the controlling unit.
It is still a further object of the present invention to provide the above oil pumping device in which a weight block is fitted in the projecting post of the movable block. Therefore, when the pneumatic air sucking mechanism sucks air, the movable block will not be sucked upward so that the through hole of the seat body will not be blocked.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 2477450 (1949-07-01), Gray
patent: 5002154 (1991-03-01), Chen
patent: 5449029 (1995-09-01), Harris
patent: 5450924 (1995-09-01), Tseng
patent: 6092390 (2000-07-01), Griffith, Jr.
patent: 6422261 (2002-07-01), DeCapua et al.
patent: 6439206 (2002-08-01), Shimamura et al.
patent: 6513541 (2003-02-01), Herlihy
patent: 6558138 (2003-05-01), Tseng
Rosenberg , Klein & Lee
Sayoc Emmanuel
Yu Justine R.
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