A manual/pneumatic oil pumping device including a housing having an upper cover equipped with a manual mechanism and a pneumatic air sucking mechanism. A closing means is disposed in the upper cover corresponding to the pneumatic air sucking mechanism. When the closing means is in an opened state, the oil reserving space communicates with the pneumatic air sucking mechanism so that the pneumatic air sucking mechanism can suck out the air in the oil reserving space and thus pump the oil. When the closing means is in a closed state, the oil reserving space does not communicate with the pneumatic air sucking mechanism and a user can manually pump the oil.

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.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 1 to 5 , the manual/pneumatic oil-pumping device of the present invention includes a housing 1 having an upper cover 11 and a lower cover 12 . An oil sucking hose 14 is connected to an oil sucking hose seat 15 of the upper cover 11 . The upper cover 11 is equipped with a manual mechanism 2 and a pneumatic air sucking mechanism 3 . The manual mechanism 2 includes an upright pump 21 disposed in the housing 1 . The top and bottom ends of the pump 21 are sealed by the upper and lower covers 11 , 12 . An oil reserving space 13 is defined between the housing 1 and the pump 21 . A piston 22 is disposed in the pump 21 . A piston stem 23 of the piston 22 extends through the upper cover 11 and is provided with a handle 24 for a user to hold. The upper cover 11 is formed with an air incoming passage 16 communicating with the oil reserving space 13 and the pump 21 . The upper cover 11 is provided with a one-way air incoming valve 26 corresponding to the air incoming passage 16 . The air incoming valve 26 is provided with a float 27 . The float 27 serves to shut off the air incoming valve 26 to prevent the oil from spilling and thus prevent the oil from entering the air incoming passage 16 . The lower cover 12 is provided with a one-way pressure relieving valve 28 corresponding to the interior of the pump 21 .

The upper cover 11 is further provided with an air sucking port 31 axially passing through the upper cover 11 (as shown in FIG. 4 a ). The air sucking port 31 communicates with the oil reserving space 13 . The pneumatic air sucking mechanism 3 is disposed corresponding to the top end of the air sucking port 31 , whereby the internal way 32 of the pneumatic air sucking mechanism 3 communicates with the air sucking port 31 and the air can flow between the way 32 and the air sucking port 31 . One end of the pneumatic air sucking mechanism 3 is connected to a conventional pressure source such as an air compressor (not shown). The other end of the pneumatic air sucking mechanism 3 has an air outlet 33 . In addition, the pneumatic air sucking mechanism 3 has a switch 37 corresponding to the air compressor for controlling the communication between the internal way 32 and the air compressor.

A closing means 34 is disposed in the air sucking port 31 , including an accommodating member 341 and a blocking body 342 . In this embodiment, the blocking body 342 is a ball body and the accommodating member 341 has a downward tapered conic hole 343 passing through the accommodating member 341 . The diameter of the ball body 342 is smaller than the large diameter of the conic hole 343 while larger than the small diameter thereof. In normal state, the ball body 342 due to its own weight drops onto and blocks the conic hole 343 so as to prevent the oil reserving space 13 from communicating with the air sucking port 31 . A stop member 35 is disposed in the air sucking port 31 of the pneumatic air sucking mechanism 3 for stopping the ball body 342 , permitting the air to flow from the air sucking port 31 to the way 32 .

When manually pumping the oil, a user directly holds the handle 24 of the manual mechanism 2 and pulls the handle 24 up and down, whereby the air in the oil reserving space 13 flows from the one-way air incoming valve 26 and the air incoming passage 16 into the pump 21 and then discharges from the one-way pressure relieving valve 28 . At this time, the oil reserving space 13 is in a negative pressure state, whereby the oil goes from the oil sucking hose 14 into the oil reserving space 13 . In addition, when the air pressure in the oil reserving space 13 is lower and lower and a negative pressure is formed, the ball body 342 is also sucked downward to more tightly block the conic hole 343 . Therefore, the closing means 34 automatically forms a closed state so as to prevent the air sucking port 31 from communicating with the oil reserving space 13 . Accordingly, leakage of air is avoided and the user can well manually pump the oil.

Referring to FIG. 4 b, when the user desires to pneumatically pump the oil, the user only needs to connect the pneumatic air sucking mechanism 3 with the air compressor and switch on the switch 37 and activate the air compressor. At this time, the air compressor injects high pressure air into the pneumatic air sucking mechanism 3 . When the high pressure air passes through the top end of the air sucking port 31 , the air therein will be sucked away due to siphon effect. At the same time, the ball body 342 is sucked upward and the closing means 34 automatically forms an opened state, whereby a communicating space 36 is defined between the ball body 342 and the wall of the conic hole 343 . Accordingly, the air in the oil reserving space 13 is sucked away through the communicating space 36 to form a negative pressure state. At this time, the oil can flow through the oil sucking hose 14 into the oil reserving space 13 . In addition, when sucked upward to a certain extent, the ball body 35 is stopped by the stop member 35 so as to prevent the ball body 342 from being sucked away along with the air.

According to the above arrangement, a user can select a suitable measure to pump oil in accordance with the environment and equipment. When converted from manual measure to pneumatic measure or from pneumatic measure to manual measure, the closing means will be automatically switched between opened state and closed state. Therefore, it is no more necessary to detach any parts from the device so that the conversion is convenient.

In addition, since it is unnecessary to detach any parts for converting the pumping measure, the possibility of missing the parts is eliminated.

Furthermore, the pneumatic air sucking mechanism and manual mechanism are both mounted on the upper cover so that the volume of the oil pumping device is not increased. Moreover, when it is desired to pour out the oil in the housing, the user only needs to extract the oil sucking hose seat 15 .

There are many modifications of the above embodiment. For example, the closing means can be a manually controlling valve disposed in the air sucking hole of the upper cover corresponding to the pneumatic air sucking mechanism. When the controlling valve is in opened state, the air sucking port communicates with the oil reserving space and a user can pneumatically pump the oil. In the case that the controlling valve is closed, the air sucking port does not communicate with the oil reserving space and a user can manually pump the oil. This achieves the same function as the first embodiment.