Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS201758 A
Publication typeGrant
Publication dateMar 26, 1878
Filing dateJan 25, 1878
Publication numberUS 201758 A, US 201758A, US-A-201758, US201758 A, US201758A
InventorsImprovement In Sewer
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improvement in sewer and other traps
US 201758 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

W. P. DOWNEY. Sewer and other Traps.





Specification forming part of Letters Patent No. 201,758, dated March 26, 1878; application filed i I January 25, 1878.

this specification, Figure l is a longitudinal vertical section of trap, showing it when the flap-valve is used. Fig. 2 is a longitudinal vertical section of same, showing the ballvalve. Fig. 3 is a transverse vertical section of same, showing it as used in a perpendicular position, using either flap or ball valve. Fig. 4 is a transverse vertical section taken on the line w w of Fig. 2.

The same letters are employed in all the figures in the indication of identical parts.

A is the body of the trap, formed substantially as shown. B are the ways. G is the ball-valve. (Shown in said former Letters Patent.) D is a flap-valve, the face of which is formed with a recess to contain an elastic ring of india-rubber or other equivalent material. To this valve is attached a stem, D, and it is fitted with trunnions D by means of which the valve is hung above the inductionpipe Gr upon bearings formed to receive the same. A thread is turned upon the upper end of the stem D, upon which a ball, D formed with a female screw, is fitted, so that by raising or lowering the ball the valve may be so balanced that it will yield in opening to what ever pressure may be desired when applied by together. These valves may be used in connection with. an induction-pipe receiving the water horizontally or vertically, the induction pipe being curved inside the valve, according to the circumstances under which the trap is to be applied.

E is a pipe attached to the outlet of said sewer-trap, which is intended to communicate with a chimney in the house, or the rain-water pipes thereof, so that the sewer-gases, which are lighter than the atmosphere, will rise and find exit over the top of the house, without tendency to force their way back through the pipes which have open communication with the interior of the house.

In my said former Letters Patent no adequate means were provided for carrying away sewage-water from the house flowing through the inlet-pipe against the resistance of backwater. One of the purposes of my present invention is to provide means by which the sewage -water from the parts of the house above the reach of backwater from floods may be freely discharged at all times; and to this end I introduce into the top of the trap a pipe, F, through which the sewage-water may be freely discharged through the trap without impediment from the valve, so that it shall, by its current coming froman elevated head, flow off freely, and operate to flush the trap, and wash out any solid matter which might otherwise lodge therein. This pipe opens above the water in the trap, which seals the pipe against the gases.

The rain-water pipe may be connected with the pipe F, so that the water flowing from the roof of the building will flow thrgugh the trap, and thus assist in flushing it.

In my said former Letters Patent the body of the trap was shown with parallel sides. I prefer, however, to curve the sides of the trap, so as to make a considerable enlargement in that part of its transverse diameter in which it is intended the ball shall operate, so that there shall be a free discharge through the trap between the walls thereof and the ball, so that the ball may be used without the ways, as, upon the incoming of backwater, the ball (which, in this case, must be light enough to float) will rise upon the, surface of the water and close the induction pipe G. In this case,

i I t however, it will be necessary to interpose some obstruction into the interior of the trap, or so contract the outlet thereof that the ball cannot rise so as to interfere with the free inflow of water through the induction-pipe F.

In order to adapt this backwater trap to drain-pipes already located without altering the latter, the outlet of the trap is curved, as

shown, and an inclination is given to the seat of the ball-valve, so that as it rises with the incoming backwater the ball will be raised against the seat before the backwater has reached the inlet-pipe G, through which it could otherwise flow into the building.

In all cases I prefer to have the inductionpipe G separate from the body of the trap, thus allowing me to make atrue valve-seat.

In the annexed drawing I have shown the trap when the flap -,valve is used, also when the ball-valve is used, and in Fig. 3 it is shown when used perpendicularly.

What I claim as my invention, and desire,

to secure by Letters Patent, is

1. In combination with the trap A and valve through, substantially as set forth.

In testimony whereof I have signed myname to this specification in the presence of two sub-.

scribing witnesses. V


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2990845 *Nov 21, 1958Jul 4, 1961Selling Harley MFlood regulator
US3677289 *Sep 9, 1970Jul 18, 1972American Air Filter CoPressure relief valve
US4029115 *Sep 3, 1975Jun 14, 1977Ted WheelerParts washer
US4046161 *Oct 31, 1975Sep 6, 1977Benoit BonneauNon-return valve for preventing back flow of waste waters
US4555820 *Jan 30, 1984Dec 3, 1985Dragstrem John ADrain pipe system
US5901731 *Feb 14, 1997May 11, 1999Traylor; Paul L.Reverse osmosis drain coupling and method of installing
Cooperative ClassificationE03F5/042