Leak-Preventing Device for a Pump
Disclosed is a pump with a shell, an air-pumping device, a cover and a leak-preventing device. The air-pumping device is used to pump air out of the shell and therefore pump liquid into the shell. The cover includes an opening and channel defined therein. The shell is in communication with the exterior via the opening and in communication with the cylinder via the channel as the cover is attached to the shell and the cylinder. The leak-preventing device is connected to the cover. The channel is normally released from the leak-preventing device as the pump is located in an upright position. The channel is blocked by the leak-preventing device as the pump is located in an inverted position.
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
The present invention is therefore intended to obviate or at least alleviate the problems encountered in prior art.
SUMMARY OF INVENTIONIt is the primary objective of the present invention to provide a pump with a leak-preventing device.
To achieve the foregoing objective, the pump includes a shell, an air-pumping device, a cover in addition to the leak-preventing device. The air-pumping device is used to pump air out of the shell and therefore pump liquid into the shell. The cover includes an opening and channel defined therein. The shell is in communication with the exterior via the opening and in communication with the cylinder via the channel as the cover is attached to the shell and the cylinder. The leak-preventing device is connected to the cover. The channel is normally released from the leak-preventing device as the pump is located in an upright position. The channel is blocked by the leak-preventing device as the pump is located in an inverted position.
Other objectives, advantages and features of the present invention will be apparent from the following description referring to the attached drawings.
The present invention will be described via detailed illustration of three embodiments versus the prior art referring to the drawings wherein:
Referring to
The air-pumping device includes a cylinder 50, a handle 51, a rod 52 and a flexible piston 53. The cylinder 50 is located in the shell 31. A lower end of the cylinder 50 is attached to the lower end 32 of the shell 31 by welding for example. Thus, the space in the cylinder 50 is separated from the space in the shell 31. The check valve 35 is located in the cylinder 50. The flexible piston 53 is located in and movable along the cylinder 50. The rod 52 is connected to the flexible piston 53 at an end and connected to the handle 51 at another end.
An annular buoyant 34 is located around and movable along the cylinder 50. The annular buoyant 34 is used with the leak-preventing device 60 in a manner to be described later.
The cover 40 includes a handle 41 formed thereon, an aperture defined therein axially, an opening 42 defined therein longitudinally, a channel 43 defined therein in a radial direction, an upper port defined therein longitudinally, and a lower port defined therein longitudinally. The channel 43 is in communication with the aperture at an end and in communication with both of the upper and lower ports at an opposite end. The cover 40 is connected to the shell 31 and the cylinder 50 so that the space in the shell 31 is in communication with the space in the cylinder 50 via the channel 43. The rod 52 is inserted through the aperture. A relief valve 44 is located in the upper port.
The leak-preventing device 60 is used to close the second end of the channel 43. As clearly shown in
The flat axle 64 is located in a recess 45 defined in an extensive portion of the cover 40. A connective plate 46 is attached to the extensive portion of the cover 40 by a screw for example. Thus, the flat axle 64 is retained in the recess 45 by the connective plate 46. Both of the thickness and width of the flat axle 64 are shorter than a diameter of the recess 45 so that the flat axle 64 is rotational in the recess 45, i.e., the lever 61 is pivotally connected to the extensive portion of the cover 40.
The valve 70 includes a reduced section 72 formed thereon. The reduced section 72 of the valve 70 is clipped by the valve-connecting tab 63. The valve 70 is movably located in the lower port as the lever 61 is pivotally connected to the extensive portion of the cover 40.
The weight 80 is connected to the weight-connecting tab 62 by a screw 81 for example. Accordingly, the weight 80 includes a screw hole defined in an end for receiving the screw 81.
The pump 30 is useful in pumping liquid such as used oil out of an oil pan of an engine of for example. Referring to
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The present invention has been described via the detailed illustration of the embodiments. Those skilled in the art can derive variations from the embodiments without departing from the scope of the present invention. Therefore, the embodiments shall not limit the scope of the present invention defined in the claims.
Claims
1. A pump including:
- a shell;
- an air-pumping device for pumping air out of the shell and therefore pumping liquid into the shell;
- a cover including an opening and channel defined therein, wherein the shell is in communication with the exterior thereof via the opening and in communication with the air-pumping device via the channel as the cover is attached to the shell and the air-pumping device; and
- a leak-preventing device connected to the cover, wherein the channel is normally released from the leak-preventing device as the pump is located in an upright position, wherein the channel is blocked by the leak-preventing device as the pump is located in an inverted position.
2. The pump according to claim 1, wherein the leak-preventing device includes a lever pivotally connected to the cover, a valve connected to the lever for blocking the channel, and a weight connected to the lever for pressing down the valve when the pump is located in the inverted position.
3. The pump according to claim 2, wherein the lever includes an axle connected to the cover, a valve-connecting tab connected to the valve, and a weight-connecting tab connected to the weight.
4. The pump according to claim 3, wherein an axis of the valve is located closer to an axis of the axle than an axis of the weight is.
5. The pump according to claim 3, wherein an axis of the valve and an axis of the weight are located at a same distance from an axis of the axle.
6. The pump according to claim 3, wherein an axis of the weight is located closer to an axis of the axle than an axis of the valve is.
7. The pump according to claim 1, wherein the air-pumping device includes a cylinder located in and connected to the shell, a flexible piston movable in the cylinder, a rod connected to the flexible piston, a handle connected to the rod, and a check valve attached to an end of the cylinder.
8. The pump according to claim 1, further including a buoyant for floating on the liquid to lift the leak-preventing device to block the channel when the shell is almost full of liquid in the upright position.
9. A pump including:
- a shell;
- a cylinder located in and connected to the shell;
- a flexible piston movable in the cylinder;
- a rod connected to the flexible piston;
- a handle connected to the rod;
- a check valve attached to an end of the cylinder;
- a buoyant movable along the cylinder;
- a cover including an opening and channel defined therein, wherein the shell is in communication with the exterior via the opening and in communication with the cylinder via the channel as the cover is attached to the cylinder and the shell; and
- a leak-preventing device connected to the cover, wherein the channel is normally released from the leak-preventing device as the pump is located in an upright position, wherein the channel is blocked by the leak-preventing device lifted by the buoyant as the shell is almost full of liquid in the upright position, wherein the channel is blocked by the leak-preventing device as the shell is located in an inverted position.
Type: Application
Filed: May 25, 2011
Publication Date: Nov 29, 2012
Inventor: Tien-Tsai Tseng
Application Number: 13/115,655
International Classification: F04B 39/10 (20060101);