Well cap apparatus

Details Well cap apparatus Well cap apparatus

2001-03-27

2003-01-07

Bagnell, David (Department: 3673)

Wells

Above ground apparatus

Well caps or casing heads

C138S089000, C166S379000

Reexamination Certificate

active

06502632

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
Not applicable
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable
REFERENCE TO A “MICROFICHE APPENDIX”
Not applicable
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to water wells, and more particularly to an improved cap arrangement that is placed on the top of the well pipe at the well head, providing improved sealing with the upper end portion of the well pipe and improved features for enabling easy access and well services, and numerous desired connections.
2. General Background of the Invention
When a water well is to be drilled, drilling equipment provides a generally vertically oriented wellbore that can extend many hundreds of feet into the earth. At least the upper end portion of this wellbore is typically lined with a pipe of selected diameter and material such as, for example, a four inch diameter plastic pipe.
At the wellhead, the upper end portion of the pipe is typically capped with a fitting. The “well cap” fitting usually fits inside the bore of the well pipe at the extreme upper end of the well pipe. This fitting is sometimes removably attached so that the well can be opened to provide access for servicing the well, removing the well pump, and/or for adding chemicals (such as chlorine) to the well.
A number of patents have issued that cover well cap constructions, illustrative examples being discussed hereinafter.
An example of a well cap construction is seen in U.S. Pat. No. 3,631,895 entitled “Well Cap”. In the '895 patent, a well cap for the end of a well casing includes end wall means and annular skirt means depending therefrom adapted to be telescoped around an upper end portion of the case. Annular sealing chamber means are defined on an inside surface of the skirt wall means radially outwardly of the sidewall of said casing. A deformable sealing ring is mounted in the chamber means for sealing between the skirt wall and the well casing. A compression ring means in the chamber means around the sealing ring compresses the ring radially inwardly against the sidewall of the casing.
U.S. Pat. No. 3,875,999 discloses a well capping assembly in which a cylindrical cap is fitted into an annular well casing head and is formed with a pair of vertical passages. Lines are sealed to one passage to convey water under pressure through the cap, and an opening directs water from that passage to a sealing groove between a pair of seals fitted between the cap and the casing. In the second passage, an assembly is fitted for sealing a second pair of seals around a conduit running through that passage, and opposing direct water under pressure from the sealing groove to a second sealing groove defined between the second pair of seals. Alternatively, the assembly and conduit can be removed from the second passage and lines sealed to that passage so that a pair of water pressure lines pass through the cap.
U.S. Pat. No. 4,334,578 discloses a well casing closure for closing and covering the top of a well casing extending above the surface of the ground. The invention is characterized by a hollow cylindrical member closed on one end and open on the other end of such dimension as to fit over the top of the well casing and to provide a reasonably snug fit about the exterior of the casing; it is further characterized by utilizing an “O” ring or the like, for sealing between the interior of the closure and the exterior of the casing; additionally, a locking mechanism is incorporated so that the closure may be locked in place over the opening and only removed by one having a key to the lock.
A gasketless well casing cap is disclosed in U.S. Pat. No. 4,457,448. The '448 patent discloses a cap assembly for sealing engagement with the upper end of a cylindrical steel well casing. The assembly provides two initially separate, upper and lower sections. The lower section has a major opening therethrough for encircling the upper end of the well casing, the diameter of said opening tapering from a dimension at the lower side which is slightly larger than the diameter of the casing, to a slightly smaller diameter at the upper side. The material of the cap and dimensions of the major opening relative to the outside diameter of the well casing are such that the lower section may be manually inserted on the casing, with the latter extending completely through the major opening, whereby the lower section is in tightly sealing engagement with the casing without requiring a gasket. The upper cap section provides a cover for the lower section and includes a recessed portion bounded by a lip of continuous, closed outline extending downwardly from the lower surface of the upper section. After the lower section is engaged with the casing, the upper section is bolted thereto with the upper section lip engaging, and preferably slightly embedded in the upper surface of the lower section to seal the opening therein, and thus the end of the well casing.
In the Fleming U.S. Pat. No. 4,715,439 there is disclosed a well cap provided for the upper extremity of a circular cylindrical casing wall of a well for potable water. The covering supports a pump positioned within the well and provides thermal insulation so that the water will not freeze when pumped from the well to underground distributor lines. The covering or cap is comprised of a lower member having an outer vertical sidewall and interiorly disposed support beams, an upper member which seals the lower member, and a cylindrical tube that transfers water from the well to underground distributor lines.
In the Howard U.S. Pat. No. 4,747,453 there is disclosed a security cover and housing for a well. The security cover and housing secures and protects a well and more particularly a well pipe. The well cover and housing comprises an open cylindrical main housing with an outwardly projecting flange that is designed to support the cylindrical housing within the well opening. A well pipe retainer insert fits within the cylindrical housing and generally surrounds and supports an upwardly projecting well pipe. A locking plate is adapted to be secured over the well pipe retainer and the well pipe. A top plate is adapted to fit onto the cylindrical opening of the main housing structure about the top portion thereof to form a closed flat upper surface.
A lockable well cap is provided in U.S. Pat. No. 4,848,458 for capping the upper end of a well casing. A base member, which has an upwardly and inwardly interior surface with tapered upwardly directed serrations formed thereon, frictionally engages a portion of the well casing. The outside surface of the base member has a lock tab which aligns with a lock tab on the cover to receive a locking padlock. The cover also includes pins which contact inclined grooves in the base member when properly engaged. A first fluid impervious gasket is seated between the well casing and the base member, and a second fluid impervious gasket is seated between the base member and the cover, both to provide a watertight and waterproof seal.
In the Roser U.S. Pat. No. 5,099,917 there is provided a shallow well installation that can be quickly, easily and economically installed and sealed against surface contamination. The installation provides a continuous plastic pipe well casing extending from ground level to the foot of the well surrounded by a filtration aggregate such as #4 stone and which is sealed by plastic film and/or elastic concrete on top of the stone. The stone extends approximately 18 inches above the water table. A plastic pipe seal and lock are placed at the top of the well casing. A water supply pipe is provided to the house through the side wall of the plastic well casing and, a small plastic pipe is installed outside the well casing within the stone surrounding the plastic well casing extending to the foot for water treatment purposes. The entire well casing installation can be installed in a freshly dug hole or can be used to renovate an existing shallow well casing to upgrade the sanitary rating and to

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