US766764A - Water-seal trap. - Google Patents

Description

PATENTED AUG. 2, 1904.

J. E. KEYT.

WATER SEAL TRAP.

APPLICATION FILED MAY 28. 1903.

N0 MODEL.

Wane-S888.

UNITED STATES Patented August 2, 1904.

JOHN E. KEYT, OF SAN FRANCISCO, CALIFORNIA.

WATER-SEAL TRAP.

SPECIFICATION forming part of Letters Patent No. 766,764, dated August 2, 1904.

Application filed May 28, 1903. Serial No. 159,058 (No model.)

To all whom, it may concern:

Be it known that I, JOHN E. KEYT, a citizen of the United States, and a resident of the city and county of San Francisco and State of California, have invented a new and useful Improvement in \Vater-Seal Traps, of which the following is a specification.

This invention relates to improvements made in traps for waste-pipes and sewer-pipes that have a curved body or depressed portion adapted to retain a body of water for a water seal. In traps of this description the body of water held in the bend prevents the passage of foul gas and odors past that point; but because of the liability to become thrown off by the action set up in the passages through the atmospheric pressure, producing what is commonly termed siphoning, the water seal is rendered unreliable to a greater or less extent. To overcome this defect, it is the common practice at the present time to connect the air-space in the trap-body above the water seal directly with the atmosphere by a vent-pipe carried from the trap to the outside of the building,where the end of the pipe is left open to the atmosphere.

The present invention has for its object, chiefly, to prevent a trap of this description having a water seal from siphoning or emptying the water-seal chamber without employing a vent-pipe, thereby materially reducing the cost of the trap and the expense of setting up and connecting it.

This improvement is of advantage also in situations where a trap already set cannot be connected with the outer atmosphere by a vent-pipe except at considerable expense or by carrying the vent-pipe either on the inside or the outside of the building in exposed or unsightly positions.

To such end and object my said invention comprises certain novel parts and combination of parts. including a novel construction of trap-body having a circuitous chamber or bend provided with a straight member at one end connecting the trap with the waste-pipe from the basin-sink or other receptacle and at the opposite end a coupling connecting the bend with a waste-pipe or a sewer-pipe, the said coupling having a central passage correwalls of the siphon passage or bend, standing v clear of the internal surfaces in the body of the coupling, so as to break or interrupt the continuity of the interior surfaces of the siphon at the outlet end.

The construction of trap to which I have applied the present improvement, as represented in the drawing, consists of a trap-body having-an inlet in the top, from which a tube f extends upward to connect with the wastewater outlet in the sink or basin, and on one side of this outlet the trap-body is enlarged to form a chamber a to acconimodatea swinging valve 7). This valve consists of aflat disk fitting closely to a seat around the inlet-aperture and hinged at one side of the opening to swing laterally and uncover the inlet under the weight of the descending body of water. A counterweight a, connected to the valve on the opposite side of its hinge, returns the valve and holds it to its seat on the inlet after the downflowing water has passed into the trap. In the side of the valve-chamber w an inletaperture k is connected permanently with a source of clear water under pressure by a pipe m, having a hand-operated shut-off valve 12, by means of which the water is turned on or shut off. The pipe m being connected with either the cold-water pipe or the hotwater pipe, furnishes a means al\ *ays at hand for flushing the trap and for cleaning all the interior surfaces in an effective and thorough manner. In this clean-water pipe between the valve 71 and the trap-body a check-valve p is sometimes placed as an additional security to close communication between the building and parts of the trap-body below the valve Z). This check-valve is sometimes called for as a precaution to prevent any possibility of foul gases being forced by a back pressure in the sewer-pipe through the water seal of the trap and through the clean-water pipe, and so into the room, in situations where the water being shut off and the faucets accidentally left open and escape of gases from the trapbody below the valve 6 might occur. These conditions would be liable to happen when a building stands vacant for a considerable time and there is no flow of waste water into the trap to maintain the water seal.

The body 8 of the trap is connected to the valve-chamber by a slip-joint and a screwthreaded clamping-ring t. A rubber packing w in a recess in the ring is compressed and confined in place around the joint by screwing down the ring.

The coupling on the outlet end of the waterseal chamber 8 is formed of the two members 2 5, the top member 2 being joined to the lower member5 bya screw-threadedfiange 6, fitted to a threaded socket in the top of'the latter member and making a tight joint against a shoulder on the inside. The way or passage through the top member 2 is approximately the same diameter internally as the end 4 of the siphon s where it joins the coupling, so that the interior surfaces of the passage are practically continuous with the internal surfaces of the siphon. The end 3 of the passage through the upper member extends into the lower member for a short distance below the joint 6 and is surrounded by a rim beveled to a thin edge. The body 5 of the coupling is of larger diameter than this I lower end of the member 2, which it incloses,

so that the walls'stand clear of the beveled rim 3, and below this enlarged portion the coupling terminates in a, cylindrical end provided with a gland or screw-threaded ring, by which the waste-pipe 7 is secured to the end of the coupling-body. A packing 10 being placed in the gland produces a gas-tight joint. The effect of this break in the continuity of the internal surfaces in this part of the passage-way of the trap is to prevent the atmospheric pressure from setting up a flow in the water from the seal over the head in the trapbody, thereby causing the trap to siphon or draw off the water until the quantity in the bend is reduced below the sealing-point. Breaking the film of water in this manner between the water seal and the body of water in the waste-pipe or sewer-pipe below the trap prevents such siphoning action and insures at all times the retention of the water in the trap to the sealing-level.

Having thus fully described my invention, what I claim as new therein, and desire to secure by Letters Patent, is.

The combination with a trap-body having a depressed portion containing a water seal, of a coupling for uniting the outlet end-of the trap with the waste-pipe, consisting of two members, one being connected directly to the trap and having its outer end terminating in a downwardly-extending rim immediately adjacent to the overflow of the trap, and the other part being of greater diameter than the said terminal rim and surrounding the same so as to leave a clear space between the rim and the inner wall of the said second part, substantially as set forth.

In testimony whereof I have signed my name in the presence of two subscribing witnesses.

JOHN E. KEYT. Witnesses:

EDWARD E. OSBORN, M. REGNER.

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