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Leak-preventing device for a pump

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Leak-preventing device for a pump


A pump includes a shell, an air-pumping device, a cover, a valve and a buoyant. The air-pumping device is used for pumping air out of the shell and therefore pumping liquid into the shell. The cover includes an opening and channel defined therein. The cover is attached to the shell and the air-pumping device. The shell is in communication with the exterior thereof via the opening. The shell is in communication with the air-pumping device via the channel. The valve is movable between a first position for releasing the channel and a second position for blocking the channel. The valve is in the second position as the pump is in an inverted position. The buoyant is used for moving the valve to the second position as the pump is almost full of liquid in an upright position.

Inventor: Tien-Tsai Tseng
USPTO Applicaton #: #20120308418 - Class: 417440 (USPTO) - 12/06/12 - Class 417 
Pumps > Expansible Chamber Type >Having Separate Noncyclic Valve (e.g., Bypass, Etc.)

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The Patent Description & Claims data below is from USPTO Patent Application 20120308418, Leak-preventing device for a pump.

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BACKGROUND OF INVENTION

1. Field of Invention

The present invention relates to a pump and, more particularly, to a leak-preventing device for a pump.

2. Related Prior Art

Referring to FIG. 1, a conventional pump 10 is located in an inverted position. The pump 10 includes a shell 11 formed with an upper end 12 and a lower end (not shown). The upper end 12 of the shell 11 is an open end. A check valve (not shown) is located in an aperture (not shown) defined in the lower end of the shell 11. A cylinder 14 is located in the shell 11. A lower end of the cylinder 14 is attached to the lower end of the shell 11. Thus, the space defined in the cylinder 14 is separated from the space defined in the shell 11. The check valve is located in the cylinder 14. A flexible piston (not shown) is located in and movable along the cylinder 14. The flexible piston is connected to an end of a rod while a handle is connected to an opposite end of the rod. An annular buoyant 13 is located around and movable along the cylinder 14. A cover 20 is connected to the shell 11 and the cylinder 14. The space defined in the shell 11 is in communication with the space defined in cylinder 14 through a channel 22 defined in the cover 20. The cover 20 includes an opening 21 defined therein. A valve 18 is used to close a first end of the channel 22 located in the space defined in the shell 11. A lever 17 is connected to the valve 18 at an end and connected to another buoyant 16 at an opposite end. The pump is useful in pumping liquid such as used oil 15 out of an oil pan of an engine of for example.

In use, the pump is located in an upright position. A plug (not shown) is fit in the opening 21. A flexible pipe (not shown) is inserted through the plug. An end of the flexible pipe is located in the space defined in the shell 11 while another end of the flexible pipe is located in the used oil 15 contained in the oil pan. The flexible piston is reciprocated in the cylinder 14 to pump air out of the space defined in the cylinder 14 and hence out of the space defined in the shell 11. Some of the used oil 15 is hence pumped from the oil pan into the space defined in the shell 11.

When the space defined in the shell 11 is almost full of the used oil 15, the channel 22 is blocked by the valve 18 lifted by the buoyant 16 and the annular buoyant 13 floating on the used oil 15 contained in the pump 10. Thus, the used oil 15 cannot be pumped into the space defined in the shell 11.

Referring to FIG. 2, to pour the used oil from the pump 10, the plug is removed from the opening 21, and the pump 10 is tilted or even inverted. The used oil is supposed to leave the pump 10 through the opening 21 only. However, there is inevitably leak of the used oil from the pump 10 through the channel 22 because the channel 22 is released from the valve 18 moved with the buoyant 16.

The present invention is therefore intended to obviate or at least alleviate the problems encountered in prior art.

SUMMARY

OF INVENTION

It is the primary objective of the present invention to provide a pump that can prevent leak.

To achieve the foregoing objective, the pump includes a shell, an air-pumping device, a cover, a valve and a buoyant. The air-pumping device is used for pumping air out of the shell and therefore pumping liquid into the shell. The cover includes an opening and channel defined therein. The cover is attached to the shell and the air-pumping device. The shell is in communication with the exterior thereof via the opening. The shell is in communication with the air-pumping device via the channel. The valve is movable between a first position for releasing the channel and a second position for blocking the channel. The valve is in the second position as the pump is in an inverted position. The buoyant is used for moving the valve to the second position as the pump is almost full of liquid in an upright position.

Other objectives, advantages and features of the present invention will be apparent from the following description referring to the attached drawings.

BRIEF DESCRIPTION OF DRAWINGS

The present invention will be described via detailed illustration of seven embodiments versus the prior art referring to the drawings wherein:

FIG. 1 is a partial, cross-sectional view of a conventional pump in an upright position;

FIG. 2 is a partial, cross-sectional view of the conventional pump of FIG. 1 in an inverted position;

FIG. 3 is a partial, cross-sectional view of a pump equipped with a leak-preventing device in accordance with the first embodiment of the present invention;

FIG. 4 is a partial, cross-sectional view of the pump in an inverted position opposite to that is shown in FIG. 3;

FIG. 5 is a cross-sectional view of a pump equipped with a leak-preventing device in accordance with the second embodiment of the present invention;

FIG. 6 is a partial, cross-sectional view of the pump of FIG. 5 but shows the leak-preventing device in a second position;

FIG. 7 is an enlarged, cross-sectional view of the leak-preventing device shown in FIG. 6;

FIG. 8 is an enlarged, exploded view of the leak-preventing device shown in FIG. 7;

FIG. 9 is a partial, cross-sectional view of the pump in an inverted position opposite to the upright position shown in FIG. 5 and shows the leak-preventing device in a second position;

FIG. 10 is a partial, cross-sectional view of a pump equipped with a leak-preventing device in accordance with the third embodiment of the present invention;



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Industry Class:
Pumps
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stats Patent Info
Application #
US 20120308418 A1
Publish Date
12/06/2012
Document #
13153457
File Date
06/05/2011
USPTO Class
417440
Other USPTO Classes
International Class
04B23/00
Drawings
20



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