Abstract:
An assembly useful in directing a stream of water onto the surfaces of a toilet bowl includes a delay valve rendered operative by the lifting of the toilet seat and a bellows spring connected to be pulled in by the latching vacuum draw of the delay valve and thereafter released to displace the seat towards its lowered state. A set of springs then opposes the dropping stroke of the seat once displaced by the bellows spring. The assembly is conformed for installation onto an existing toilet.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to toilet bowl devices and more particularly to an auxiliary water flow structure for producing a laminar flow sheet on the bowl surface that is rendered operative in conjunction with the articulation of the toilet seat. 
     2. Description of the Prior Art 
     In a typical household there are few physical structures that accommodate or distinguish between the male and female anatomy of the occupants, the accommodation of the anatomical differences being mostly focused in the structure of a toilet. To resolve this differentiation in use the typical household toilet includes a pivoted seat that is often manually raised by the male as a courtesy to those that may follow, thus moving the seat surface away from any incident backsplash. The articulated seat, however, is then frequently left in its upright position and this inattention, itself, often rises to the level of a constant irritant and a source of dispute. 
     In the past various devices have been proposed which in one way or another lower the toilet seat after a time period expires after it has been raised. Examples of such devices can be found in the teachings of U.S. Pat. No. 5,488,744 to Paananen; U.S. Pat. No. 5,742,949 to Golgi, et al.; U.S. Pat. No. 6,035,454 to Birchall; and others. While suitable in resolving these pervasive inattention disputes, and thus for the purposes intended, these teachings do not address, nor do they contemplate, the other subsidiary household disputes about those parts of the backsplash that fall outside the confines of the toilet bowl. Simply, the statistical distribution of splashing during the course of male urination extends beyond the toilet bowl periphery and the articulated seat courtesy therefore attends to only one part of the problem. Also needed are techniques and devices that modify backsplash kinematics to the confines of the bowl. Devices that concurrently control the backsplash trajectory while also automatically attending to the seat lowering courtesy are therefore extensively desired and it is one such device that is disclosed herein. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is the general purpose and object of the present invention to provide a seat lowering mechanism effected by a water stream that also produces a laminar flow over the interior surfaces of a toilet bowl. 
     Other objects of the invention are to provide a hydraulic actuator for an articulated toilet seat that also produces a laminar fluid flow sheet on the surfaces of a toilet bowl. 
     Further objects of the invention are to provide a water flow operated toilet seat lowering device which also is useful to produce a laminar flow over the interior bowl surfaces. 
     Yet additional objects of the invention are to provide an structure for producing a backsplash controlling surface flow in a toilet bowl that cooperates with an automated sequence of seat lowering. 
     Briefly, these and other objects are accomplished within the present invention by providing an air filled bellows spring mounted to oppose the articulation of a toilet seat, the bellows spring being connected with, and forming a common cavity with, the vacuum chamber of a conventional delay valve also mounted to be initiated by the pivoting of the seat. Thus once the seat is raised the resulting flow through the delay valve creates a partial vacuum therein, latching the delay valve to an open (on) state and also latching the bellows spring to its pulled in position. In this state the flow output from the delay valve is directed through an exit port aligned along the interior bowl surface, forming a laminar flow surface that modifies the net rebound kinematics of any flow associated with male urination. When, however, this water flow ends by the vacuum breaking timing mechanism customarily provided the spring bellows is free to vent releasing its opposing bias to displace the seat from its vertical equilibrium which then allows the seat to drop against the spring bias of two balance springs that control the seat return articulation. 
     Preferably, the delay period of the delay valve is selected to span a time interval that is greater than the typical interval of male urination, e.g., a minute or less, during which the water flow is directed tangentially onto the bowl surface to create a circular flow sheet therein. This circulating water flow sheet provides a tangential velocity component to any urination stream that may merge therewith, thereby limiting the kinematics of any backsplash to a dominantly tangential path. The circulating flow sheet, moreover, assists in maintaining a high level of cleanliness within the bowl thus further enhancing the utility of the instant invention These functions can be conveniently implemented by commercially available devices with the lifting articulation of the seat providing the necessary sequence initiation. 
     Those skilled in the art will appreciate that the circulation in a toilet bowl includes a component that is determined by the rotation of the Earth. Water conservation interests, in turn, require that the sheet flow be minimized. To optimize the benefit of the laminar sheet flow the tangential velocity thereof can be enhanced by selecting the exit flow alignment according to each hemisphere, conveniently effected by selecting the direction of a pivotal exit port in the form of a convolved exit pipe segment that is releasably connected to the delay valve. In this manner the orientation selection of a single element is utilized to expand the utility of the whole assembly. 
     It will be appreciated that toilet bowls with very little exception include an interior surface that promotes good surface flows towards the drain opening. This geometry compensates for the drag losses of the laminar sheet flow developed herein and as the flow rates drop off due to surface expansion the loss is then compensated by the gravitational effects. A simple, low volume water flow source is thus rendered effective over the whole of the bowl surface to alter the backsplash trajectory throughout the bowl. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective illustration, separated by parts, of a conventional toilet seat provided with the inventive water flow system rendered operative by the articulation thereof; 
     FIG. 2 is yet another perspective illustration of a toilet bowl implemented with the inventive water flow system described herein; 
     FIG. 3 is a diagrammatic illustration of the water flow system in accordance with the present invention; 
     FIG. 4 is a vector diagram illustrating the energy vector contribution to the net reflected vector from the sheet water flow in accordance with the present invention; 
     FIG. 5 is a side view detail of the toilet bowl implemented with the inventive water flow system. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     As shown in FIGS. 1-5, the inventive water flow system, generally designated by the numeral  10 , comprises a conventional toilet bowl TB provided with its flushing reservoir FR supplied with pressurized water from a wall (or floor) mounted water outlet WO. In typical practice toilet bowl TB is further provided with a pivotally mounted seat PS mounted on a hinge or pivot assembly PA at the rear of the bowl opening adjacent the reservoir FR. It is this seat PS that is usually raised to a vertical alignment adjacent the reservoir by the male user of the toilet during urination, and while this courtesy is often practiced lowering the seat is less than consistent along with the inherent rebound dynamics of the stream that often cause unwanted splatter outside the confines of the toilet bowl. It is these two courtesies that are resolved herein. 
     More precisely, the inventive water flow system  10  is conformed as an aftermarket installation to be mounted on an offset bracket or strap  11  conformed to match the fastener pattern of the seat pivot assembly PA and is thus fixed in a sandwiched arrangement between the pivot assembly PA and the corresponding toilet bowl surface. In this position offset bracket  11  is useful to mount a bellows spring  12  and a conventional delay valve  25  next to each other, in a vertical alignment subjacent the plane of the pivotally lifted toilet seat PS. At the same time an angled piece  15  is secured to the underside of seat PS, again along and adjacent the pivot assembly PA, to pivotally advance a cantilevered panel  16  against the bellows spring  12  and the manual selector  26  usually provided with delay valve  25  to set off its operation, the selector  26  being thus aligned for articulation when the seat is lifted. Of course, adjustment is provided to effect these pivotal contacts only when the seat is raised beyond its vertical position, by way of slotted fastener openings  15   a  in the angled piece  15  and also by adjustable mountings  11   a  and  11   b  attaching the bellows spring  12  and the delay valve  25  and by slotting the pivot assembly openings  11   c  in bracket  11  as well. Additionally a set of helical helper springs  21   a  and  21   b  is installed at both the pivots of pivot assembly PA to oppose the return motion of the seat. 
     Those skilled in the art will appreciate that while in small variations conventional delay valves may be variously implemented the typical configuration of delay valve  25 , like that sold by the Sloan Company under the model or style ‘Flushometer’ or that sold by the China Winds Group under the model no 3812, is characterized by a flow control chamber  27  connected to the water outlet WO and controlled either by the vacuum displacement of a diaphragm  28  or by the selector  26  to open the water flow passage through a venturi  29 . Once this flow starts the lower venturi pressure pulls a partial vacuum in a vacuum chamber  31  to displace diaphragm  28  and thereby latch the valve to its open state. A controllable part of the flow is then diverted to a vacuum breaker chamber  32  and it is this diverted flow rate that determines the duration of the flow. 
     In accordance with the present invention the foregoing conventional delay valve is modified to include a port in the vacuum chamber  31  to which a tubing segment  22  is connected, segment  22  communicating at its other end with bellows spring  12 . Thus once the seat PS is lifted to its over-center position, depressing bellows spring  12  and at the end articulating selector  26 , the vacuum drawn in the common cavities below diaphragm  28  and bellows spring  12  keeps the spring pulled in until the delay limit is reached and the vacuum is broken. At that point the interior of the bellows is vented through the venturi  29  to atmospheric pressure, pushing seat PS back across its neutral point from where it then falls against the opposing springs  21   a  and  21   b . In this manner a timed stream of water is provided while the seat is upright which, on its termination, initiates the lowering of the seal This stream of water may be directed into the interior of bowl TB by way of a further tubing segment  41  connected to the outlet of the venturi  29  and convolved to pass under seat PS into the bowl interior where the tubing end is collapsed to form a transverse end slot  42  that is tangentially aligned along the interior bowl surface. 
     Those skilled in the art will appreciate that the foregoing assembly may be easily installed onto existing toilet structures with minimal modifications. For example, the water source itself may be obtained from a tee connection  46  installed into the conventionally provided conveyance tube CT extending from the outlet WO to the reservoir and two forms of the tubing segment  41  may be provided to accommodate use in both the Northern and Southern hemispheres. The triggering point of the selector  26  can similarly be adjusted to be just beyond the upright seat alignment, thereby accommodating various seat structures and weights. 
     In this manner a laminar flow sheet is formed over the interior surfaces of the toilet bowl which both cleans the surfaces and also produces a gradient of flow vectors FV 1  through FVn that are all tangential to the local surface in a descending spiral towards the bottom of the bowl. Referring in particular to FIG. 4 the normal rebound angle RA shown as a set of vectors RV 1  through RVm are each substantially equal, but opposite, to the incidence angle IA of the urination stream US and with some frequency the rebound trajectories resulting from vectors RV 1 -RVm extend beyond the bowl. This rebound pattern is inventively modified herein by the addition of the flow vectors FV 1 -FVn and by a simple adjustment of a control valve  45  on the conveyance tube CT the level of this laminar flow can be raised to a point where virtually all backsplash is eliminated. In this manner a conveniently mounted modification is obtained which eliminates virtually all arguments concerning the courtesies of shared toiled use. 
     Obviously, many modifications and variations can be effected without departing from the spirit of the invention instantly taught It is therefore intended that the scope of the invention be determined solely by the claims appended hereto.