Pumps – Motor driven – Including manual – mechanical – or diverse drive
Reexamination Certificate
2001-08-17
2003-05-06
Freay, Charles G. (Department: 3746)
Pumps
Motor driven
Including manual, mechanical, or diverse drive
C417S040000, C417S118000, C137S205000
Reexamination Certificate
active
06558138
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to a manual/pneumatic oil-pumping device which can be switched between manual operation mode and pneumatic operation mode without detaching any parts.
FIG. 6
shows a conventional manual oil-pumping device including an oil reservoir
7
. An upright pump
8
is connected between the upper and lower covers
71
,
72
of the oil reservoir
7
. A piston
81
is disposed in the pump
8
. The piston stem
82
of the piston
81
extends through the upper cover
71
to connect with a handle
83
for manual operation. The upper cover
71
is formed with an air incoming passage
711
communicating with the interior space
73
of the oil reservoir
7
and the interior space of the pump
8
. The inlet
712
of the air incoming passage
711
is provided with a one-way air incoming valve
713
connected with a float
714
. The lower cover
72
is provided with a one-way pressure relieving valve
74
inside the pump
8
.
When a user holds and upward pulls the handle to lift the piston
81
, the air above the piston
81
is compressed to flow to lower side of the piston
81
. When the user pushes the piston stem
82
downward to lower the piston
81
, the air thereunder will pass through the pressure relieving valve
74
and is relieved. The air pressure above the piston
81
is reduced, whereby the air in the reservoir space
73
will pass through the air incoming valve
713
and enter the pump
8
. As a result, the oil is sucked from the sucking tube into the reservoir space
73
. Accordingly, when the user up and down pulls the piston stem
82
, the oil in the oil tank can be sucked into the oil reservoir
7
. When the oil in the oil reservoir
7
reaches a certain height, the float
714
buoys upward to shut off the air incoming valve
713
and prevent the oil from getting into the pump
8
.
The above oil-pumping device is manually operated, and it is time-consuming and laborious to operate the oil pumping device.
FIGS. 7 and 8
show a manual/pneumatic oil-pumping device. The oil reservoir
9
is equipped with a pneumatic air sucking mechanism
91
which is connected to an air compressing mechanism (not shown). When activating the air compressor, the air in the oil reservoir
9
is directly sucked out, whereby the oil is sucked through the oil sucking tube
93
into the oil reservoir
9
. When converted into manual operation mode, it is necessary to detach the pneumatic sucking mechanism
91
and then mount the manual operation mechanism
92
on the oil reservoir
9
. Such procedure is quite troublesome and it is necessary to store the detached aparts in an additional room. Under such circumstance, it is easy to misplace the parts.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a manual/pneumatic oil-pumping device. The upper cover of the oil-pumping device is equipped with a manual mechanism, a pneumatic mechanism and a closing means. When converted between manual operation mode and pneumatic operation mode, it is unnecessary to detach any parts from the device so that it is convenient to operate the device, and the parts of the device are prevented from being misplaced.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 1960389 (1934-05-01), McFerran, Jr.
patent: 2477450 (1949-07-01), Gray
patent: 5002154 (1991-03-01), Chen
patent: 6092390 (2000-07-01), Griffith, Jr.
Belena John F
Freay Charles G.
Rosenberg , Klein & Lee
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