Toilet and method for manufacture of the same

A toilet for flowing the supplied flush water into bowl water held in a toilet bowl and draining it away together with the bowl water from a siphon trap, wherein

• the siphon trap comprises:
• an ascending conduit segment having a trap opening that opens into the underside wall of the toilet bowl, and defining a conduit that extends diagonally upward from the trap opening;
• an apical conduit segment of elbow configuration connecting to the top end of the ascending conduit segment, having an apical dam for regulating the level of the bowl water;
• and
• a descending conduit segment connecting to the apical conduit segment and descending therefrom, the descending conduit segment comprising a conduit shelf for receiving and deflecting flush water flowing into the ascending conduit segment, over the apical dam of the apical conduit segment, and down into the descending conduit segment due to inflow of the discharged flush water into the bowl water;
• a downstream conduit segment for guiding flush water deflected by the conduit shelf towards the downstream end;
• and a constrictor having a constricted conduit area situated at the terminus of the downstream conduit segment, for guiding flush water to a drain opening outside the toilet;
• the descending conduit segment having a descending conduit configuration, as flush water conveyed from the ascending conduit segment drains to the drain opening, to reception by the conduit shelf of flush water flowing down over the apical dam, to diversion of the flow direction of the flush water downflow towards the constrictor, and to accumulation of the flush water downflow in the constrictor, whereby a seal is produced in the constrictor by means of flush water from the upstream conduit, and such that even with air trapped in the conduit segment extending from the apical conduit segment to the conduit shelf, flush water accumulating in the constrictor forms a water column extending up to the apical dam, and once the water column has formed, with the trapped air sealed in the apical conduit segment, siphoning action is generated to suck down the flush water in the toilet bowl and the siphoning action may be sustained.

A toilet for flowing the supplied flush water into bowl water held in a toilet bowl and draining it away together with the bowl water from a siphon trap, wherein

• the siphon trap comprises:
• an ascending conduit segment having a trap opening that opens into the underside wall of the toilet bowl, and defining a conduit that extends diagonally upward from the trap opening;
• an apical conduit segment of elbow configuration connecting to the top end of the ascending conduit segment, having an apical dam for regulating the level of the bowl water;
• and
• a descending conduit segment connecting to the apical conduit segment and descending therefrom, the descending conduit segment comprising a conduit shelf for receiving and deflecting flush water flowing into the ascending conduit segment, over the apical dam of the apical conduit segment, and down into the descending conduit segment due to inflow of the discharged flush water into the bowl water;
• a downstream conduit segment for guiding flush water deflected by the conduit shelf towards the downstream end;
• and a constrictor having a constricted conduit area situated at the terminus of the downstream conduit segment, for guiding flush water to a drain opening outside the toilet;
• the descending conduit segment having a descending conduit configuration, as flush water conveyed from the ascending conduit segment drains to the drain opening, to reception by the conduit shelf of flush water flowing down over the apical dam, to diversion of the flow direction of the downflowing flush water towards the constrictor, and to accumulation of the downflowing flush water in the constrictor, whereby a seal is produced in the constrictor by means of flush water from the upstream conduit, and such that when air present in the apical conduit segment is pushed by flush water rising up the ascending conduit segment and flows into the conduit downstream from the apical conduit segment, the inflowing air is trapped at a location downstream from the apical conduit segment and prevented thereby from returning to the apical conduit segment, whereby flush water accumulated in the constrictor forms a water column extending to the apical dam, so that siphoning action is generated to suck down the flush water in the toilet bowl and the siphoning action may be sustained.

A toilet comprising:

• a toilet bowl for holding bowl water;
• a toilet stool for supporting the toilet bowl;
• and a siphon trap conduit for generating a siphoning action when flushing away waste, wherein the siphon trap conduit comprises an ascending conduit segment extends diagonally upward from a trap opening that opens into the underside wall of the base portion of the toilet bowl;
• an apical conduit segment forming an elbow conduit connecting to the top end of the ascending conduit segment and having an apical dam for regulating the level of the bowl water;
• and
• a descending conduit segment connecting to the apical conduit segment and descending therefrom,
• wherein a portion of the wall of the elbow conduit of the apical conduit segment, the wall portion constituting the conduit wall opposite the apical dam, and extending from the coupling portion with the ascending conduit segment to the coupling portion with the descending conduit segment, is composed of a discrete element in the casting stage prior to firing of the toilet, [the element] being separate from the toilet stool, the toilet bowl, and the remainder of the siphon trap conduit exclusive of the wall portion,
• the wall portion casting being joined to the remainder of the siphon trap conduit to close off the siphon trap conduit, and fired.

A toilet comprising a toilet bowl for holding bowl water;

• a toilet stool for supporting the toilet bowl;
• and a siphon trap conduit for generating a siphoning action when flushing away waste, the toilet further comprising:
• a terminal conduit segment situated at the terminus of the siphon trap conduit and connecting with a drain opening outside the toilet, the terminal conduit segment connecting the descending conduit segment to the drain opening via the terminal conduit segment,
• wherein the terminal conduit segment constitutes, in the casting stage prior to firing of the toilet, a separate element from the casing composed of the siphon trap conduit, the toilet bowl and the toilet stool,
• the casting for the terminal conduit segment being joined to the terminus of the siphon trap conduit in the casting stage, and fired.

A method for manufacturing a toilet comprising a toilet bowl for holding bowl water;

• a toilet stool for supporting the toilet bowl;
• and a siphon trap conduit for generating a siphoning action when flushing away waste, wherein the siphon trap conduit comprises an ascending conduit segment extending diagonally upward from a trap opening that opens into the underside wall of the base portion of the toilet bowl;
• an apical conduit segment forming an elbow conduit connecting to the top end of the ascending conduit segment and having an apical dam for regulating the level of the bowl water;
• and a descending conduit segment connecting to the apical conduit segment and descending therefrom,
• the method comprising the steps of:
• (1) molding a casting for a wall portion constituting the conduit wall opposite the apical dam, and extending from the coupling portion with the ascending conduit segment to the coupling portion with the descending conduit segment;
• (2) molding a casting for a toilet integrally composed of the toilet stool, the toilet bowl and the siphon trap conduit apart from the wall portion;
• and
• (3) joining the wall portion casting to the toilet casting to close off the siphon trap conduit, and with the ascending conduit segment, apical conduit segment and descending conduit segment connected to form the siphon trap conduit, subjecting the same to firing;
• wherein the step (2) comprises the steps of:
• preparing a bottom mold having a concave shape conforming to the bottom wall contours of the toilet bowl, the bottom wall contours of the toilet stool, and the exterior contours of the descending conduit segment of the siphon trap conduit, excepting the wall portion;
• side molds having concave shape conforming to the side wall contours of the toilet stool;
• a bowl insert mold having a convex shape conforming to the inside peripheral wall contours of the toilet bowl;
• and
• a split mold having exterior contours conforming to the conduit inside wall contours of the ascending conduit segment of the siphon trap conduit and to the apical dam contours of the apical conduit portion, and capable of being assembled with the bowl insert mold, the split mold, when assembled with the bowl insert mold, joining therewith in portion conforming to the bottom inside wall of the toilet bowl of the convex shape of the bowl insert mold, the joining location serving as the opening location for the trap opening;
• assembling the prepared molds to form, by means of the concave contours and convex contours of the molds, a cavity for molding the toilet casting, [the casting] integrally composed of the toilet stool, the toilet bowl and the siphon trap conduit apart from the wall portion;
• and
• flowing slip into the cavity to deposit a slip layer on the molds, draining, drying, and parting the molds to produce the toilet casting.