This invention relates generally to plumbing fixtures and, in particular, to a manually cleanable drain trap that is easy to clear without removal.
The outlets of plumbing fixtures such as sinks and toilets typically employ a bent section in the form of a U-, S-, or J-shaped pipe which retains a small amount of water after the fixture's use, so as to prevent sewer gases from exiting from the plumbing fixture outlet and entering the building in which the plumbing fixture is installed. These bent sections are commonly referred to as “traps.”
Since traps are the localized low point in the plumbing, heavy items or items that are difficult to fit through the plumbing outlet are often collected in the trap. These items may include hair, sand, debris, and the products of defecation. For this reason most traps can either be disassembled for cleaning or provide some sort of cleanout feature.
Drain traps for kitchen and bathroom sinks are typically located in cabinetry immediately below the sink. One proposed solution to avoiding disassembly to clean a plugged sink drain trap is to make the low point of the bend out of a manually compressible material, usually a plastic. One example is disclosed in U.S. Pat. No. 2,484,031, which describes a trap including a hollow receptacle of generally tubular shape, an inlet socket member and an outlet socket member. The receptacle is constructed of “an elastic plastic material” which is sufficiently resilient to yield to deformation by the hand so that slime and other matter precipitated inside the trap may be loosened therefrom by squeezing the receptacle by hand so as to temporarily deform the same.
U.S. Pat. No. 7,004,508 teaches a one-piece body with proximal and distal ends including a section “formed to be flexible” and to have a stiffness that is less than either the stiffness of the body adjacent to distal end or the stiffness of the body adjacent to proximal end. The varying stiffness of the section permits the body to be easily manipulated during installation or removal, but will also permit a blockage to be “easily cleared.”
With configurations of the type just described, when material collects in the bend, it can often be forced down the drainpipe by manually pressuring the flexible section to force the collected material down the pipe. However, these existing configurations are inefficient, since the applied compressive force pushes fluid out of the bend in both directions, returning some of water in the bend through the entrance of the plumbing fixture outlet rather than forcing all of the fluid and debris downstream.
The present invention improves upon prior-art solutions by providing a drain trap that easily facilitates the compression of a flexible section while blocking the simultaneous reverse flow of water out of the fixture inlet drain.
A manually cleanable drain trap according to the invention includes a bent tubular structure comprising a fluid inlet section, a fluid outlet section, and a U-shaped trap section disposed between the fluid inlet and outlet sections. The construction of the trap section is such that it enables the trap section to be manually squeezed or otherwise manipulated to dislodge unwanted materials clogging the trap section. A one-way or “check” valve disposed in the fluid inlet section permits fluid to flow into the fluid inlet section and through the trap section, while preventing back flow from the trap section and into the fluid inlet section as the trap section is manually squeezed.
The construction of the trap section is resiliently flexible to facilitate manual manipulation of the trap section. In the preferred embodiment, at least the trap section is composed of a compressible, resilient material such as a rubber-like elastomer. The wall thickness of the trap section may also be thinned-down to support this manual manipulation. In all preferred embodiments, the inner wall of the trap section is smooth to reduce debris build-up in the first place. The outer surface of the trap section, however, may be non-smooth or indeed textured to assist a user in gripping and squeezing the trap section.
The one-way or check valve disposed in the fluid inlet section is preferably a ball valve, which may be disposed in a bulbous section formed in the fluid inlet portion. The ball housing further preferably includes a circular seat that the ball engages with under pressure to close the valve. The ball housing may also include an inner wall with ribs that enable fluid to flow around the ball when the valve is not closed.
To accommodate existing installation connection systems, the fluid inlet and fluid outlet sections may both be vertically oriented upon installation, with the end section of the fluid inlet being positioned above the end section of the fluid outlet section.
In accordance with the invention, the construction of the trap section 106 is such that it enables the trap section to be manually squeezed to dislodge unwanted materials and debris that might be clogging the trap section 106. In the preferred embodiment shown in
The trap section may be made of a more rigid material such as PVC if the wall thickness is intentionally thinned to facilitate manual manipulation. However, in the preferred embodiments a more compressible, resilient material is used at least for the trap section. Indeed, the trap section may be composed of a material that is sufficiently flexible that the inner walls of the trap section may touch one another when that section of the trap is squeezed. Such materials at least include at least the following (though not in order of preference):
Coplyester
Copolyamide
TPU (Thermoplastic Polyurethane)
TPV (Thermoplastic Vulcanizate)
SBC (Styrene Block Copolymers)
TPO (Thermoplastic polyolefin elastomers)
Natural Rubber (Polyisoprene)
Polybutadiene rubber
Neoprene rubber
Butyl Rubber
Halogenated Butyl Rubber
Nitrile Rubber
Hydrogenated Nitrile rubber
PU (Thermoset Polyurethane rubber)
Silicone
TPSiV (Thermoplastic Silicone Vulcanizate)
EVA (Ethylene-vinyl acetate)
Fluorinated Silicone
Flouroeastomers
EPDM (Ethylene Propylene Diene Rubber)
Unique to this invention, a one-way, back-flow-prevention valve is disposed in the fluid inlet section. In operation, this valve permits fluid to flow into the fluid inlet section and through the trap section, while preventing fluid from flowing from the trap section and into the fluid inlet section as the trap section is manually squeezed. In the preferred embodiment the valve is a ball valve described in detail below. However, other types of one-way vales may alternatively be utilized, such as leaf or flap valves with any number of flaps. While the ball valve described herein conveniently relies on gravity in the open condition, biasing such as spring biasing may be used in conjunction with any desired valve type.
As mentioned, however, in the preferred embodiment a ball valve is used which includes ball 130 disposed in ball housing 132 which may constitute a bulbous section of the fluid inlet section. In the preferred embodiment, the housing includes an inner wall with ribs 134 that enable fluid to flow around the ball when the valve is not closed, and a circular seat 136 that the ball engages with under pressure to close the valve.
This application claims priority from U.S. Provisional Patent Application Ser. No. 62/205,771, filed Aug. 17, 2015, the entire content of which is incorporated herein by reference.
Number | Date | Country | |
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62205771 | Aug 2015 | US |