Hydraulic and earth engineering – Fluid control – treatment – or containment – Flow control
Reexamination Certificate
2002-09-17
2004-03-02
Lee, Jong-Suk (James) (Department: 3673)
Hydraulic and earth engineering
Fluid control, treatment, or containment
Flow control
C405S121000, C210S170050, C210S747300
Reexamination Certificate
active
06698977
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to ditch liners and more specifically to modular ditch liners, which allow a ditch liner to be assembled from a plurality of ditch liner sections.
2. Discussion of the Prior Art
There are two different types of ditch liners. The first type of ditch liner is an open ditch liner. An example of an open type of ditch liner is found in U.S. Pat. No. 3,854,292 to Nienstadt. Nienstadt uses a relatively light plastic resin that is retained with a quantity of stakes. The second type of ditch liner is a closed ditch liner. The closed ditch liner includes a substantially U-shaped trough with a cover. The cover may have openings formed therethrough. Three examples of closed type ditch liners are found in U.S. Pat. No. 5,226,748 to Barenwald et al., U.S. Pat. No. 5,443,327 to Akkala et al., and U.S. Pat. No. 5,522,675 to Gunter. The Barenwald et al. and Gunter patents disclose using relatively complicated connecting devices to retain each liner section in tight connection to each other.
Accordingly, there is a clearly felt need in the art for a modular ditch liner which is fabricated from a heavy, yet economical material; does not require a relatively complicated connecting device; and does not require a perfect trench for installation.
SUMMARY OF THE INVENTION
The present invention provides a modular ditch liner that does not require complicated installation and assembly. An open modular ditch liner includes a plurality of open liner sections and at least one alignment key. The cross section of each open liner section includes a substantially concave shape formed on a top thereof. The plurality of open liner sections are preferably fabricated from cement block on a cement block casting machine. Casting cement blocks is a cost effective manufacturing process relative to cast iron or open cast molding. A key slot is formed on at least one side of each open liner section to receive a single alignment key. However, the at least one key slot may be replaced with at least one key opening. Each key opening is formed through a length of the open liner section, near a side thereof. The key opening is sized to receive an alignment key.
A closed modular ditch liner includes a plurality of closed liner sections, a plurality of covers, and at least one alignment key. The cross section of each closed liner section includes at least one trough contour and a single cover retention lip formed on a top end of each side thereof. The plurality of closed liner sections and covers are preferably fabricated from cement block on a cement block casting machine. Each cover is laterally retained between the two cover retention lips. A key slot is formed on at least one side of the closed liner section to receive a single alignment key. However, the at least one key slot may be replaced with at least one key opening. Each key opening is formed through a length of the closed liner section, near a side thereof. The key opening is sized to receive an alignment key.
Accordingly, it is an object of the present invention to provide a modular ditch liner that is fabricated from a heavy, yet economical material.
It is a further object of the present invention to provide a modular ditch liner that utilizes an uncomplicated connection device.
Finally, it is another object of the present invention to provide a modular ditch liner that does not require the creation of a perfect trench for installation.
These and additional objects, advantages, features and benefits of the present invention will become apparent from the following specification.
REFERENCES:
patent: 3625011 (1971-12-01), Stevenson
patent: 3854292 (1974-12-01), Nienstadt
patent: 5226748 (1993-07-01), Barenwald et al.
patent: 5443327 (1995-08-01), Akkala et al.
patent: 5522675 (1996-06-01), Gunter
patent: 5803662 (1998-09-01), Gunter
patent: 5853265 (1998-12-01), Gunter
patent: 6560933 (2003-05-01), Richardson
patent: 2002/0094238 (2002-07-01), Schibi
patent: 06026023 (1994-02-01), None
Ersler Donald J.
Lee Jong-Suk (James)
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