Untitled record

Application filed October 9,1891, Serial No. 408,255, (No model.)

To all whom it may concern:

Be it known that I, John Downs, a citizen of the United States, residing in the city and county of San Francisco, State of California, 5 have invented an Improvement in SewerGates; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to the class of doors io or gates for sewers for the purpose of preventing the backflow of tide or other water which may accumulate in the sewer and also to prevent sewer-gas passing from the main sewers into side sewers or house connections. 15' My invention consists in the peculiarlyconstructed gate or door hereinafter fully described, and specifically pointed outin the claims, and its novel location with respect to the sewer and its connections.

2o . The object of my invention is to provide a simple and effective gate or door of this class especially adapted for side sewer, and which will prevent the backwater from getting into said side sewers and will also answer fora trap 25 prevent the sewer-gas from passing into and through said sewers into buildings or streetopenings which convey surface water into the sewers. .

Referring to the accompanying drawings 30 for a more complete explanation of my invention, Figure 1 is a perspective view of my gate or door. Fig. 2 is a vertical section of same. Fig. 3 is a section showing it in place in a sewer.

The door or gate is made of an open-centered ring or frame A and a flap B, hinged to the frame A. These parts are preferably made of brass in order to resist the injurious action of salt-water and acids in the sewers, 40 though they may be made of other material.

The frame A is a ring-shaped piece formed with an inner flange a, an outer flange a', and an intervening ridge a³. The frame is also provided with lugs or brackets a⁸, and the 45 flap Bis provided with corresponding lugs or brackets δ, and through said brackets a⁸ and δ a pintle C passes, whereby the flap B is suspended from and is hinged to the frame A. The diameter of the flap B is such that it 50 laps well over and fits snugly against the inner flange a of the frame A and lies just within the ridge a², thereby forming a close joint. The ridge a² at its lower portion is cut out or omitted, as shown at a⁴, which is for the purpose of preventing the accumulation of 55 dirt or other substances at that point, which would have a tendency to prevent the flap from closing tight. The frame A has also a top flange a⁵ extending inwardly at right angles. The flap B may have a bottom weight- 60 lug b’ to insure its closing. The door or gate is located in the sewer as follows:

p is one piece of sewer-pipe, and E is the adjacent piece, the latter being made of greater diameter than the former in order to 65 provide free and unobstructed space for the working of the flap. These two pipes fit together by the usual slip-joint; but the pipe D has its end flange d made thicker than usual toprovide a firm bearing-surface for the frame 70 A, and the socket e of the pipe E is made deeper than usual to receive the flange d.

The frame A of the door or gate is fitted to the face of the end flange d of pipe D, with its top flange a^s fitting over the top portion 75 of said flange, and the frame is secured to the pipe by means of any usual cement, such as mortar or white or red lead. When the two pipes are fitted together, the outer flange a' of the frame fits and is confined snugly be- 80 tween the meeting faces of the joint of the two pipes, and suitable cement intervening holds the frame well in place. The faces of the two pipes are made upon a slight angle, so that the flap B in a closed position does 85 not quite reach the perpendicular, thereby providing for the firm closing by gravity of the flap against its seat in the frame A. The flap B works freely into the larger pipe E, so that it can not be obstructed. This pipe E, 90 as shown in Fig. 3, is the one which immediately joins the main sewer F. The pipes D and E therefore form part of the side sewer, and the pipe E may properly be termed the “ protector ” for the gate or door, because it 95 provides for the location of said gate or door outside of the main sewer, thereby preventing any contact of obstructing substances with it tending to disarrange it, as would be the case if it were located immediately within 100 the main sewer; also, pipe E being larger, the water has an increased force of flow as it

468,985 drops from pipe D, and this prevents dirt and rubbish from keeping the door from closing tight.