Patent Application
20070266485
It is to be understood that the various embodiments of the present invention described herein may be utilized in various orientations and in various configurations, without departing from the principles of the present invention. The embodiments are described merely as examples of useful applications of the principles of the invention, which is not limited to any specific details of these embodiments.
Representatively illustrated in
The apparatus 10 provides for applying positive or negative pressure to the drain 12. This pressure may be applied, for example, to loosen, remove or dissolve a clog, or to displace fluid out of the drain 12, etc. One purpose for displacing fluid out of the drain 12 would be to winterize a recreational vehicle or house (i.e., to prevent fluid from remaining in a P-trap of the drain and freezing), or to allow disassembly or maintenance of the drain and associated P-trap without spillage of fluid, etc.
The apparatus 10 includes a conduit 14 made of a tubular material, such as metal or PVC pipe. A cap 16 is threaded onto a lower end of the conduit assembly, and an opening 18 is provided in the cap.
The opening 18 is preferably sized to adequately restrict flow between the conduit 14 and the drain 12, so that very sudden pressure surges are not applied to the drain. A diameter of approximately 3/16 inch has proven satisfactory for this purpose, but other sizes may be used for the opening 18 if desired.
A drain isolation device 20 is attached at a lower end of the conduit 14. As depicted in
To secure the device 20 to the conduit 14, a coupling 22 and short conduit section 24 are threaded to the conduit and cap 16. This threaded connection of the section 24 between the coupling 22 and cap 16 allows the device 20 to be compressed between the coupling and cap. Locking washers 26 may be used to prevent loosening of these threaded connections.
The apparatus 10 as depicted in
Note that it is not necessary for all three pressure sources 28, 30, 32 to be connected to the apparatus 10 simultaneously. Instead, a particular circumstance may call for connecting only a single one of the pressure sources 28, 30, 32, and other circumstances may call for connection of a combination of two or three of the pressure sources.
For example, if the apparatus 10 is to be used for displacing water out of a P-trap, then only the pressure source 30 may be connected to the apparatus. The pressure source 30 may be a source of compressed gas, such as an air compressor, accumulator or storage tank.
As another example, if the apparatus 10 is to be used for loosening a clog in the drain 12, then both of the pressure sources 28, 32 may be connected to the apparatus. The pressure source 28 may be a source of negative pressure (relative to atmospheric pressure), such as a shop vacuum. The pressure source 32 may be a source of pressurized fluid, such as a municipal water supply. In this manner, alternating positive and negative pressures may be applied to the drain 12 (by alternately opening and closing the valves 34, 38) to loosen the clog.
Releasable connectors 40, 42, 44 are included in the apparatus 10, so that the pressure sources 28, 30, 32 may be conveniently connected to the conduit 14 in any desired combination. For example, the connector 40 may be a slip-on adapter for a shop vacuum, the connector 42 may be a conventional air chuck, and the connector 44 may be a conventional water hose connector.
A water hose connector may be most convenient, since a pressurized water source is typically located near a drain. To assist in dissolving a clog, a hot water source may be used.
An additional conduit section 46 and T-fittings 48 are provided so that the valves 34, 36, 38 and connectors 40, 42, 44 are conveniently arranged. However, it will be readily appreciated that a wide variety of configurations of conduits, fittings, etc. could be provided, instead of the particular configuration depicted in
In addition, note that the conduit 14 has different lengths in
In operation, the availability of multiple pressure sources (as in the configurations of
Although only a single pressure source is used, the configuration of
In the configurations of
In a preferred method of forming the threads 62, an externally threaded fitting (such as a pipe nipple) is threaded through the housing 58, so that it extends into the interior of the housing. The substance 60 is then poured around the fitting in the housing 58 and is allowed to set, so that the threads are effectively molded into the hardened substance.
The externally threaded fitting may be removed after the substance 60 has hardened, or it may be left in place and used to connect the valve 36 and pressure gauge 54 to the cap 56. Of course, other means of connecting the valve 36 and pressure gauge 54 to the conduit assembly may be used, without departing from the principles of the invention.
Referring additionally now to
For this purpose, a swivel 64 may be provided between any of the releasable connectors 40, 42, 44 and the conduit assembly. This allows the connectors 40, 42, 44 to be oriented as desired for maximum convenience in connecting the pressure sources 28, 30, 32.
Referring additionally now to
A lower end 68 of the fitting 66 has external threads formed thereon for threading into the device 20. An upper end 70 of the fitting 66 has internal threads formed therein for receiving the conduit 14 therein.
An internal passage 72 of the fitting 66 may provide the flow restricting function otherwise provided by the opening 18 in the cap 16 as described above, or the cap or another flow restricting element could be used in conjunction with the fitting 66. However, it should be understood that it is not necessary for flow to be restricted at the device 20, fitting 66 or cap 16 in keeping with the principles of the invention.
Referring additionally now to
The fitting 74 has an internally threaded lower end 76 for receiving the conduit section 14 or 46 therein, an internally threaded end 78 for receiving the conduit section leading to the valve 34 therein (alternatively, the valve 34 could be threaded directly into the end 78 of the fitting 74), and an internally threaded end 80 for receiving the valve 36 and pressure gauge 54 assembly therein.
Preferably, the fitting 74 is molded as a single element. If, for example, the pressure source 28 is not used, then the end 78 could be plugged or capped off. As another example, if the pressure source 30 is not used, then the end 80 could be plugged or capped off.
Instead of plugging or capping off the ends 78, 80 if a particular pressure source is not used, the fitting 74 may be formed without the respective internal threads. In
In another configuration, the end 80 could be solid and the end 78 could be internally threaded. In this configuration, the fitting 74 may be used in the apparatus 10 as depicted in
Of course, a person skilled in the art would, upon a careful consideration of the above description of representative embodiments of the invention, readily appreciate that many modifications, additions, substitutions, deletions, and other changes may be made to these specific embodiments, and such changes are within the scope of the principles of the present invention. Accordingly, the foregoing detailed description is to be clearly understood as being given by way of illustration and example only, the spirit and scope of the present invention being limited solely by the appended claims and their equivalents.
