FreshPatents.com Logo
stats FreshPatents Stats
n/a views for this patent on FreshPatents.com
Updated: April 14 2014
newTOP 200 Companies filing patents this week


    Free Services  

  • MONITOR KEYWORDS
  • Enter keywords & we'll notify you when a new patent matches your request (weekly update).

  • ORGANIZER
  • Save & organize patents so you can view them later.

  • RSS rss
  • Create custom RSS feeds. Track keywords without receiving email.

  • ARCHIVE
  • View the last few months of your Keyword emails.

  • COMPANY DIRECTORY
  • Patents sorted by company.

AdPromo(14K)

Follow us on Twitter
twitter icon@FreshPatents

Leak-preventing device for a pump

last patentdownload pdfdownload imgimage previewnext patent


20120301339 patent thumbnailZoom

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.

Inventor: Tien-Tsai Tseng
USPTO Applicaton #: #20120301339 - Class: 417490 (USPTO) - 11/29/12 - Class 417 
Pumps > Expansible Chamber Type >Pumping Member Position Controlled Port

view organizer monitor keywords


The Patent Description & Claims data below is from USPTO Patent Application 20120301339, Leak-preventing device for a pump.

last patentpdficondownload pdfimage previewnext patent

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 in the cylinder 14 is separated from the space 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 in the shell 11 is in communication with the space 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 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 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 in the cylinder 14 and hence out of the space in the shell 11. Therefore, some of the used oil 15 is pumped from the oil pan into the space in the shell 11. When the space 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. To pour the used oil from the pump 10, the plug is removed from the opening 21, and the pump 10 is tilted. The used oil is supposed to leave the pump 10 through the opening 21 only. However, there is 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 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.

BRIEF DESCRIPTION OF DRAWINGS

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

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

FIG. 2 is a cross-sectional view of a pump with a leak-preventing device according to the first embodiment of the present invention;

FIG. 3 is an exploded view of the leak-preventing device shown in FIG. 2;

FIG. 4 is a perspective view of the leak-preventing device shown in FIG. 3;

FIG. 5 is a front view of the leak-preventing device shown in FIG. 4;

FIG. 6 is a left side view of the leak-preventing device shown in FIG. 5;

FIG. 7 is a left side view of the leak-preventing device in another position than shown in FIG. 6;

FIG. 8 is a front view of the leak-preventing device in an inverted position relative to the upright position shown in FIG. 5;

FIG. 9 is a perspective view of a lever of a leak-preventing device according to the second embodiment of the present invention; and

FIG. 10 is a perspective view of a lever of a leak-preventing device according to the third embodiment of the present invention.



Download full PDF for full patent description/claims.

Advertise on FreshPatents.com - Rates & Info


You can also Monitor Keywords and Search for tracking patents relating to this Leak-preventing device for a pump patent application.
###
monitor keywords



Keyword Monitor How KEYWORD MONITOR works... a FREE service from FreshPatents
1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored.
3. Each week you receive an email with patent applications related to your keywords.  
Start now! - Receive info on patent apps like Leak-preventing device for a pump or other areas of interest.
###


Previous Patent Application:
Compressing diaphragm pump having abnormal pressure preventing features for spray use
Next Patent Application:
Electromagnetic flow rate control valve and high-pressure fuel supply pump using the same
Industry Class:
Pumps
Thank you for viewing the Leak-preventing device for a pump patent info.
- - - Apple patents, Boeing patents, Google patents, IBM patents, Jabil patents, Coca Cola patents, Motorola patents

Results in 0.45685 seconds


Other interesting Freshpatents.com categories:
QUALCOMM , Monsanto , Yahoo , Corning , -g2-0.2085
     SHARE
  
           

FreshNews promo


stats Patent Info
Application #
US 20120301339 A1
Publish Date
11/29/2012
Document #
13115655
File Date
05/25/2011
USPTO Class
417490
Other USPTO Classes
International Class
04B39/10
Drawings
10



Follow us on Twitter
twitter icon@FreshPatents