US2779430A

US2779430A - Surface drains

Info

Publication number: US2779430A
Application number: US356750A
Authority: US
Inventors: Martin A Sisk
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-05-22
Filing date: 1953-05-22
Publication date: 1957-01-29
Anticipated expiration: 1974-01-29

Description

M. A. SISK SURFACE DRAINS Jan. 29, 1957 Filed May 22, 1953 IKIVENTOR United States Patent SURFACE DRAINS Martin A. Sisk, Pittsburgh, Pa.

Application May 22, 1953, Serial No. 356,750

2 Claims. (Cl. 1s2-31 My invention relates to surface drains for use in the floors of shower bath enclosures, roadways, decks of ships, floors and roofs of buildings, and the like, to pro vide debris-excluding protection at the inlets of drain openings or pipes. The structure of the invention will also find utility as a guard for pipes and openings of any sort in which liquid is received, and in the operation of which it is desirable to exclude solids of a size that might clog the opening, or the pipe leading therefrom.

In general, an outlet or floor drain of the type in mind consists in a cup-shaped body that is installed within or below the floor or other'structure whose surface is to be drained, and the inlet of the body is covered by a removable top or grate. The upper face of the grate usually lies flush with the surface to be drained. The body of the drain forms a belled terminus at the end of a drain pipe laid beneath or within the structure whose surface is to be drained.

In the usual prior structures the grate consists in a perforate cover of metal which rests at its periphery in a rabetted seat formed in the rim of the body of the drain, and most of the Water entering the drain does so through holes or openings in the cover or grate located inwardly from the rim of the drain body, with the result that the flowing Water does not completely flush the inner surface of the side wall of the drain body. Consequently, debris carried by the waste water tends to accumulate on such surface of the drain body, especially just below the grate, and between the seat in the drain body and the edge of the grate. The accumulated debris over a period of time decomposes, creating foul odors and unsanitary conditions. In order to cleanse such drains, it is necessary to remove the grate and scrub or scrape away the accumulations-manifestly an unpleasant task. An important feature of this invention resides in the elimination of these objectionable conditions.

My present invention comprises a drain structure having a peripheral slot whose outer edge is vertically aligned, or substantially so, with the inner surface of the drain body. This slot is effective throughout the periphery of the drain body inlet, and the exposed internal surfaces of the drain body below the grate extend from this slot downwardly to the drain outlet, or to the inlet of the drain pipe on which the drain body is mounted, affording a clear unrestricted downsweep for the How of the draining water. No objectionable ledges, channels, or crevices are present in the structure, on which or in which debris may accumulate.

In accordance with my present invention, the peripheral slot is formed between spaced inner and outer peripheral portions of the grate body.

The application for these Letters Patent comprised a continuation-in-part of my copending application, Serial No. 288,774, filed May 20, 1952.

In the accompanying drawings:

Fig. 1 is a view in plan of a drain structure embodying the invention; and

2,779,430 Patented Jan. 1957 Fig. 2 is a view of the drain structure in vertical section, on the plane indicated at Il--II in Fig. 1.

Referring to the drawings, the drain body will be seen to comprise a casting 2 of iron, or of a more expensive metal, if desired. The drain body is provided with a peripheral rim 3, within whose ambit the inlet of the drain body is found. A grate 5 is positioned across the inlet, in this case with the top of the grate flush with the surface 6 of the floor or other surface to be drained. Extending downwardly from the rim portion 3, the side wall of the drain body comprises a vertical succession of smooth annular surfaces e, f, g and h, the latter surface (h) sloping downwardly and inwardly to an openingin this case a threaded opening i-which receives the terminal of the drain pipe (not shown), for conducting the drainage liquid to a sewer or other point of disposal.

While the inlet of the drain body is herein shown to be circular in plan, it will be understood that the form of such inlet may be square, octagonal, or of other desired contour.

The internal surface of the side wall of the drain body, extending downwardly from the rim 3 in a continuous series of smooth surface areas (6 to it) that fair with one another, provides a downsweep that is unobstructed, having no recesses or ledges in which, or upon which, drainage water, or sediment, or debris may accumulate. Cooperating with such internal surface of the drain body is a slot 7 formed within the grate body.

The lower portion of the drain body has a radially extending horizontal flange 8 upon which the usual sub-floor membrane or flashing of lead or tar paper (not shown) is secured. This is a conventional detail of construction, and for present purposes it need only be remarked that any Water seeping from the floor surface 6 downwardly between the drain body and the adjacent body of the floor is caught on the membrane and drained through weep holes 9 into the drain body.

The grate or perforate top 5 of the drain structure is in this case of general plate or disk-like form, comprising inner and outer

peripheral portions

10 and 11, respectively. Within the inner peripheral portion 10 spaced cross-bars or bearer bars 12 form the open-work body of the grate, through which drainage liquid may enter the drain body therebelow. A feature of my structure consists in the provision of the peripheral slot 7 between the inner and outer peripheral portions of the grate.

Extending radially between the said inner and outerperipheral portions of the grate body is a plurality of relatively narrow radial lugs or spokes 13 that are widely spaced apart circumferentially of the grate, so that the slot 7, as far as flow of drainage liquid. into the drain is concerned, forms a substantially continuous flushing opening which is peripherally coextensive with the downsweeping side wall of the drain body. The spokes 13 are preferably cast integrally with the

portions

10 and 11.

The side wall portion of the drain body forms an inclined annular seat for the support of the grate, and the bottom edge of the outer peripheral portion 11 of the grate is correspondingly inclined, to engage snugly such seat. It will be observed that the body of the outer peripheral portion 11 is snugly embraced by the side wall portion e of the drain body, whereby there is a positive opposition to any tendency for the grate to tilt when pres= sure or load is applied to the rim of the grate.

It is important to note that the outer peripheral portion 11 of the grate in assembly forms in effect an element of the drain body rim 3; that is, the inner side surface 14 of the outer peripheral portion of the grate is substantially aligned with the internal surface of side wall porthe surface g of the drain body a continuous downsweep.

The spokes 13 are of relatively small circumferential extent with respect to the intervening slot 7 of the drain structure.

A large part of any liquid to be drained from surface 6 is received by the slot 7', whence the liquid flows straight downwardly upon and; over the unrestricted internal surfaces of the drain body below, thereby flushing such surfaces with a downsweeping flow of liquid that keeps them clean. While the slot 7 is narrow enough to excludef'rom the drain solids of a size that might clog the drain pipe, the area of said slot is so proportioned with respect to the aggregate area of the openings between. the bars 12 that a large part of the liquid draining into the structure enters by way'of the slot, thus'insuri'ng the desired scavenging: or scouring flow of liquid'downwardly upon the unrestricted drain body side wall;

If it is desirable to flush-out the drain pipe, and the trap associated therewith, with a bucket of water or a hose, it is not necessary, as in the case of prior structures, to remove the grate, since an adequately rapid flow of water through the drain can be obtained to remove sediment from the drain pipe and trap, if indeed sediment can collect when the drain of this invention is used. My drain structure serves substantially the same purpose as the more costly flushing rim drains that are provided with a hollow rirn into which water is piped under pressure. Furthermore, the tapping of such flushing water from city supply lines is undesirable because it necessitates cross connections with the city supply, with the danger of back syphonage and contamination of the city water.

While the drain body 2 is herein shown to consist of a single or unitary casting, such body may be formed of a plurality of telescoped body portions, to afford vertical adjustment of the body, as described in my copending application, Serial No. 356,748, filed May 22, 1953. Various other modifications of the structure described may be made without departing from the spirit of the invention defined in the appended claims.

I claim:

1. In a surface drain comprising a drain body provided with an inlet having a peripheral rim, a peripheral side wall extending downwardly from said rim to an outlet, and a grate supported in position across the inlet; the invention herein described wherein said side Wall is formed with an internal surface that extends downwardly from the inner edge of said rim to said outlet, providing a substantially continuous downsweep that is smooth and substantially unrestricted throughout the peripheral and vertical extents of said side wall, said side wall including an annular downwardly and inwardly inclined seat formed integrally on the inside of the drain body within and below said rim, said grate comprising a perforate body within an inner peripheral portion and an outer peripheral portion spaced outwardly from and united to said inner portion, the outer peripheral portion of the grate engaging said seat to support the grate across said inlet, the inner vertical surface of said outer peripheral portion of the grate forming in effect an upward continuation of that portion of the internal surface of the drain body side wall which is located immediately below said outer peripheral portion of the grate, the space between said inner and outer peripheral portions of the grate forming a relatively wide drainage slot that extends in substantial continuity around the periphery of the drain structure, whereby in service the entire internal surface of the drain structure is flushed by an unrestricted downsweeping flow of drainage fluid.

2. In a surface drain comprising a drain body provided with an inlet having a peripheral rim, a peripheral side wall extending downwardly from said rim to an out let, and a grate supported in position across the inlet; the invention herein described wherein said side wall is formed with an internal surface that extends downwardly from the inner edge of said rim to said outlet, providing a substantially continuous downsweep that is smooth and substantially unrestricted throughout the peripheral and vertical extents of said side wall, said side wall including an annular seat formed integrally on. the inside of the drain body within and below said rim, said grate comprising a perforate body within an inner peripheral portion and an outer peripheral portion spaced outwardly from and united to said inner portion, the outer peripheral portion of the grate engaging said seat to support the grate across said inlet, the inner vertical surface of said outer peripheral portion of the grate forming in effect an upward continuation of that portion of the internal surface of the drain-body side wall which is located immediately below said outer peripheral portion of the grate, the space between said inner and outer peripheral portions of the grate forming a relatively wide drainage slot that extends in substantial continuity around the periphery of the drain structure, whereby in service the entire internal surface of the drain structure is flushed by an unrestricted downsweeping flow of drainage fluid.

References Cited in the file of this patent UNITED STATES PATENTS 977,860 Franklin Dec, 6, 1910 1,646,994 Decker Oct. 25, 1927 1,762,838 Shand June 10, 1930 1,786,558 Boosey Dec. 30, 1930 1,809,413 Hirshstein June 9, 1931 2,328,315 Warren Aug. 31, 1943 2,607,434 Sisk Aug. 19, 1952 e-iiw