Liquid purification or separation – Processes – Separating
Reexamination Certificate
2000-02-29
2001-01-23
Popovics, Robert (Department: 1723)
Liquid purification or separation
Processes
Separating
C210S791000, C210S155000, C210S159000
Reexamination Certificate
active
06177020
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a screen assembly for collecting and discharging solid matter from a liquid-solid mixture in a waste stream. More particularly, it refers to a pneumatic drive assembly containing a stepping screen for lifting solids out of a waste water stream and depositing them in a solids repository.
BACKGROUND OF THE INVENTION
It is well known in the prior art as shown in U.S. Pat. No. 4,853,116 to use a driving motor with an associated gear box propelling a pair of chains to move a grid structure upwardly and thereby lift solids out a liquid-solid mixture in a waste stream. Saw teeth are formed on combinations of displaceable bars and stationary bars to prevent the displaceable bars from becoming blocked. Such a system, while accomplishing its intended purpose, is cumbersome and unusually complex resulting in a high cost assembly of components. A more efficient and cost effective system is needed.
SUMMARY OF THE INVENTION
The present invention overcomes the deficiencies of the assembly described in U.S. Pat. No. 4,853,116 and provides an efficient cost effective means of removing solids from a liquid waste stream.
The invention is directed to an assembly of a grid structure surrounded by an outer frame with the assembly bottom portion located in a liquid waste stream containing solids. The grid structure includes multiple parallel alternate static and dynamic bars. Each bar has multiple vertically spaced apart shelves at a right angle to the vertical axis of the bar. The dynamic bars have multiple spacers located on each side surface to space the dynamic bars from the static bars and support the horizontal displacement of the bars.
The outer frame on each side of the grid structure contains a single and double stroke pneumatic cylinder connected to the dynamic bars by a shaft and mounting plates. The single stroke cylinder causes the dynamic bars to move in a vertical plane and the double stroke cylinder cause the dynamic bars to move in a horizontal plane as dictated by a preprogrammed pneumatic system.
The grid structure moves solid material upwards and over the top of the grid structure to fall by gravity onto a conveyor for delivery of the solids to a waste receptacle. The liquid moves through the grid structure without impediment.
REFERENCES:
patent: 4521305 (1985-06-01), Deal
patent: 4853116 (1989-08-01), Wallander
patent: 5618415 (1997-04-01), Johnson, Jr.
Larson James E.
Larson & Larson P.A.
Popovics Robert
LandOfFree
Stepping screen assembly for collecting solids in waste... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stepping screen assembly for collecting solids in waste..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stepping screen assembly for collecting solids in waste... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2527113