Delivery fitting for hydromassage bath tub

Abstract: A delivery fitting for hydromassage bath tub has an axial conduit formed by the assembling of three components (29,31,39) to eject the water mixed with air into the tub and an opening (26) controlled by a valve (50) for discharging and/or recycling the water sucked from the tub by a pump.

Description: This invention relates to delivery fittings for bath tubs suitable to deliver a jet of water mixed with air into a bath tub. Delivery fittings for bath tubs are known, in general they have an inlet conduit having a Venturi cross-section in correspondence of which a depression occurs when the water is passing through and a certain amount of air is sucked in, then such air and water are mixed and ejected from the delivery fitting to act a massage on the user's body lying in the bath tub. Usually the bath tubs have one outlet on the bottom of the tub to drain the water, a drawdown level connected with the outlet and a suction device in the outlet for recycling the water. The document DE-A-37 17 508 shows a design of a valve for controlling a current of a fluid. This valve is only used for closing or opening a delivery conduit to control the delivery of a mixture of water and air into a tub. Further, the document GB-A-1 592 982 shows a hydrotherapy unit comprising one conduit with a first duct for feeding water under pressure and a second duct for feeding air into an axial delivery conduit having a Venturi-shaped nozzle and a second conduit positioned beneath the first conduit for recycling the water. Before being able to actuate the hydrotherapy unit, the tub has to be filled up with water until the hydrotherapy units are lying beneath the water level. Further, the hydrotherapy unit according to the GB-1 592 982 consists of two members which will need much mounting space in a bathtub and cause high manufacturing costs. Furthermore, you need an additional outlet for the tub to drain the water and you have to first fill the tub before switching on the hydrotherapy unit. It is therefore object of the invention to provide a delivery fitting which needs little mounting space for mounting in a bath tub, is able to fill up the tub, recycle the water for the hydromassage and drain it from the tub. This object will be achieved by the features of claim 1. According to the invention, there is provided a delivery fitting for a hydromassage bath tub corresponding to the definitions of claim 1. Other aspects and advantages of this invention will be more apparent from the description based on the following drawings in which: the figure 1 is a lateral view, partially in cross-section, of the delivery fitting, according to the present invention; the figure 1A is a lateral view, partially in cross-section, of a different embodiment of the delivery fitting, according to the present invention; the figure 2 is a frontal view of the delivery fitting of figure 1; the figure 2A is a plan view of the delivery fitting of figure 1; the figure 3 is a cross-section of the inlet body of figure 1; the figure 3A is a cross-section of the inlet body, according to another embodiment; the figure 4 is a cross-section of a first part housed in the inlet body of figure 3; the figure 4A is a frontal view of the part shown in fig. 4; the figure 5 is a cross-section of a second part housed in the inlet body of figure 3; the figure 5A is a frontal view of the part shown in fig 5; the figure 6 is a cross-section of a third part housed in the inlet body of figure 3; the figure 6A is a frontal view of the part shown in fig. 6; the figure 6B is a different embodiment of fig. 6; the figure 7 is a cross-section of the locking nut 17 shown in fig. 1; the figure 8 is a lateral view of the valve 50 shown in fig. 1; the figure 9 is a plan view of the valve of fig. 8; the figure 10 is a cross-section of the assembling of the parts shown in fig. 4 5,6 the figure 11 is a cross-section of the locking nut covering 19 shown in fig.1. With reference to the figure 1, the delivery fitting for bath tub has a one-piece main body 11, which defines; (i) the inlet body 12 having a shape of a truncated cone (ii) the duct 13 feeding water under pressure (iii) the duct 14 sucking air (iv) the duct 15 discharging water. All the above components are made in one piece, i.e. moulded plastic material. The main body 12 is fixed to the wall 16 of the tub (not shown) by a locking nut 17, which engages the edge 18 of the delivery fitting by screwing. The locking nut 17 can be covered by a covering 19 (shown in dotted lines in figure 1 and more in detail in figure 11), said covering being engaged with the locking nut by a click device (see fig. 11). The covering has a projection 19', which extends into the inlet body 12 for a given length and adheres at a portion of the innermost surface of the inlet body wall. The figures 2 and 2A show the covering 19, the feeding water duct 13, the discharging water duct 15 in different views for a better understanding. The figure 3 shows the air duct 14, the end of which forms a nozzle 20 positioned downstream of the openings for water coming from the duct 13. At the low portion of the body 12 there is one opening 21 with a non-return valve 22 (figure 1) having a flat cap and a rod 23 with check teeth and a spring 25 to hold open the aperture 21. At the high portion of the body 12 (over the opening 21) there is a larger aperture 26, as a passage for the discharging water duct 15; a lug 28 with a hole is positioned under the aperture 26, inside the duct 15. The bottom of the body 12 has a shape of a spheric cap 27, the axis of which coincides with the axis of last portion 14A of the duct 14 ending with the nozzle 20. In the modified embodiment of the inlet body 12 shown in figure 3A the last part 14A of the air duct 14, the nozzle 20 is lacking, and the air duct 14 is directly connected with the spheric cap at the bottom 14C of the body; the last part 14A and the nozzle 20 are made in a one-piece component shown in figure 6B. As shown in the figure 1, inside the main body 12 the delivering device for ejecting the water is mounted coming from the duct 13, mixed with air, coming from the duct 14 and nozzle 20; said delivering device being coaxial with the body 12 and having a member of components (32, 36, 43) shown in detail in the figures 4, 4A, 5, 5A, 6, 6A and 10. The figure 4 shows the cross-section of the outermost component 32 located at the highest part of the delivery fitting of figure 1, the opening 30 is at the level of the covering 19. The component 32 has a conduit 29 extending along the component's axis and tapering from the largest opening 30 towards the smallest opening 31; the opening 31 has a cylindrical shape. Around the cylindrical opening 31 there is an annular recess 33, described in more detail hereinafter. The component 32 shows a portion 34 having a shape of a spheric cap, water-tight with the walls of a complementary opening (see figure 1); the contacting surfaces can slide one to the other for an angular displacement of the component 32. The component 32 has a projection 35 for assembling the component 32 with the component 43 (see fig. 10) and an annular groove 35A housing a water sealing element (not shown). The figure 5 shows the cross-section of an intermediate component 36 (see also figure 10); the component 36 has a seat 37 housing the projection 38 of the component 32 (figure 4), a conduit 39 tapering from said seat 37 to the bottom of the component 36; the opening of the conduit 39 at the bottom is larger than that at the level of the seat 37, so that the coaxial conduits 39, 31, 29 form an opening having a Venturi configuration. Inside the conduit 39 the nozzle 20 of the duct 14, is located so that the depression in front of the nozzle, caused by the water flow through the Venturi conduit, induces an air suction from the nozzle 20. The component 36 has two cylindrical projections 40, 41 with an annular opening 42 therebetween; the projections 40, 41 are housed in the annular recess 33 of the component 32 (figure 10). The bottom of the component 36 has an annular, tapered projection 44, which engages the internal surface of the spheric cap 34 of the component 32 (figure 10); such an engagement is water-tight. The figure 6 shows the cross-section of the innermost component 43, which has a lowest portion 45 having a spheric cap shape; the portion 45 engages with the internal surface of the spheric cap 27; the contacting surfaces can slide one to the other for an angular displacement of the components 43, 36, 32 (fig. 1). The component 43 has a number of projections 46 circumferentially spaced from each other, so as to have a sort of cage: through the spaces between the projections 46 the water coming from the duct 13 is introduced in the delivery device to be ejected with the air coming from the nozzle 20 from the opening 30 into the bath tub. The figure 10 shows the cross-section of the assembling of the three components 43, 36, 32. A spring 47 is housed in the annular opening 42 (figure 5), and it reacts between the base of the annular opening 42 and the top of the annular recess 33, moving the component 36 axially away from the component 32; the tapered projection 44 slides along the internal surface of the spheric cap 34 of the component 32 to reach the stop 48 of the component 43. In this position the internal wall of the conduit 39 rests on the tapered end 49 of the nozzle 20 and it closes the water flowing to the conduits 31 and 29, as shown by dotted lines in figure 10; the full lines show the device in operation, in which the spring 47 is compressed by the water pressure, the component 32 is moved away from the nozzle 20 and a water passage is open therebetween. In such a condition the water pressure is in equilibrium with the spring thrust. In the embodiment shown in figure 6B the component 43A is identical to the component 43 of figure 6, as far as the parts 45 and 46 are concerned; it presents the conduit 14B and the nozzle 20 corresponding to the conduit 14A of figure 3; when the component 43A is assembled inside the inlet body 12 of figure 3A, the conduit 14B is axially aligned with the opening 14C at the bottom of the body and connected with the duct 14. As hinted above, the delivery fitting according to the present invention has a water discharge passage and means to avoid backwater in the body of the delivery fitting. As shown in figure 3, the aperture 26 is controlled by a valve having a plate 50 (figure 1, 8, 9) with a U-shaped bracket 51; a pin 52 is coupled, with the lug 228 of the body 12; an arm 53 is rigidly connected to the plate 50. The plate 50 is rotating around the pin 52 to open (see dotted lines in figure 1) and close (see full lines in figure 1) the aperture 26; the angular rotation is controlled by an electromagnet 54 having a keeper 55 for the arm 53. In the discharging water duct 15 there is a ferrule 56 to adapt such a duct to the domestic hydraulic system, the duct 15 (or ferrule 56) is connected with all delivery fittings and the pump of the installation. To avoid backwater in the body of the delivery fitting, there is the opening 21 with a non-return valve 22 (figure 1), which is connected with the duct 15. The operations of the delivery fitting, according to this invention, are descripted herebelow. When the pump of the installation is actioned, the water under pressure enters the delivery fitting body 12 coming from the duct 13, and through the spaces between the projections 46 of the component 43 enters the cavity of said component, the water thrusts the bottom portion and the internal walls of the conduit 39 of the component 36. The component 36 is moved away from the tapered end 49 of the nozzle 20, the spring 47 is compressed and a water passage is opened therebetween; the waters flows into the conduits 31 and 29. In the conduit 31 the water flow causes a depression, inducing an air suction from the nozzle 20; the water mixed with air is ejected under controlled pressure from the opening 30 into the bath tub of the hydromassage installation. When the water level in the bath tub is high enough to enter the main body 12 of the delivery fitting, the electromagnet 54 is actuated, and the valve 50 opens the passage 26, so that the water flows into the discharging duct 15 to be addressed to the pump to operate the water cycle. When the hydromassage is over, the pump is stopped, the electromagnet is actuated to open the passage 26 and discharge the remaining water from the delivery fitting; as the water pressure inside the main body 12 is fallen down, the valve 22 is openend by the spring 25, so that even the water contained in the bottom portion of the delivery fitting flows into the conduit 15. A further preferred embodiment of the delivery fitting according to this invention, is shown in figure 1A in which the same numerical references of figure 1 are maintained whenever possible. A covering 119 has a projection 120 extending inside the cavity of the main body 12 of the delivery fitting 11, to completely cover the discharge opening 26 connected with the duct 15 under the control of the valve 50. The innermost edge 121 of the projection 120 is housed in an annular groove 122 on the flange 127, so that no air accidentally coming from the main body cavity is allowed to reach the conduit 15 and then the pump of the installation. With such an arrangement any suction of air by the pump is avoided with the advantage to have no irregular jets due to pump cavitations. The outermost portion of the covering 119 has a cap 123 over the locking nut 17, the annular edge of the cap is engaged in an annular groove of the locking nut 17. The cap 123 has the lateral openings 124 communicating with the main body cavity 125 constituded by the projection 120, the flange 127 and the opening 26; through the openings 124, the cavity 125, the opening 50 and the duct 15 the water passes from the bath tub to the pump for the hydromassage cycle. With the lateral openings 124 the suction of the water from the bath tub to the pump is assured, even if the opening of the delivery fitting were accidentally obstructed, for example by the user's body. From the above description, further advantages of the delivery fitting, will be apparent, according to the present invention. Firstly, the opening and closing of the delivery fitting is controlled by the pump of the installation; if the hydraulic pressure falls, the air conduits are tightly separated from the water conduits. Secondly, the delivery fittings, according to this invention, can be used for discharging and/or recycling the water, so that the normal discharge fitting in the bath tub can be avoided. Thirdly, any backwater in the body of the delivery fitting is eliminated with evident advantages in terms of hygienics and life of the components. A delivery fitting for hydromassage bath tub has an axial conduit formed by the assembling of three components to eject the water mixed with air into the tub and an opening controlled by a valve for discharging and/or recycling the water sucked from the tub by a pump.

Claims: A delivery fitting for hydromassage bath tub fixed to a tub wall comprising an inlet body (12), a first duct (13) for feeding water under pressure and a second duct (14) for sucking air, a first aperture (26) to discharge water and connected with a pump for the water suction, an axial delivery conduit (29, 31, 39) for delivering water mixed with air having a cross-section at each end (29, 39), larger than at an intermediate portion (31) of the conduit to have a Venturi effect, said second duct (14) having a nozzle (20) at its end, said nozzle being axially aligned with said delivery conduit (29, 31, 39), the end of said nozzle (20) being at a fixed distance from said intermediate portion (31), further comprising a discharge duct (15), said delivery conduit (29, 31, 39) being arranged inside said inlet body (12), characterized in that said first aperture (26) for discharging the water is positioned on the wall of the inlet body (12) and is controlled by a valve (50), so that said inlet body (12) serves also as a discharge port. A delivery fitting, according to the claim 1, characterized in that the inlet body (12) has a wall which tapers towards the outside, and said aperture (26) is positioned on the tapered wall. A delivery fitting, according to the claim 1, characterized in that said valve (50) has a plate movable between a first position of opening and a second position of closing of said first aperture (26), the movement being controlled by activating means. A delivery fitting, according to the claim 3, characterized in that the activating means are an electromagnet. A delivery fitting, according to claims 1 and 2, characterized in that said inlet body (12) has a second aperture (21) positioned on the wall of said body below the first aperture (26), said second aperture being controlled by a valve (22) subject to the water pressure supplied by the pump through the duct (13), said valve being movable between a first position of opening and a second position of closing by a spring (25), the first and second aperture communicating with a discharge duct (15). A delivery fitting, according to claim 1, characterized in that said axial delivery conduit comprises an outermost component (32) having a first axial conduit (29) which tapers towards the outside and a second axial cylindrical conduit (31), an intermediate component (36) having a third axial conduit (39) which tapers towards the inside and contacts the tapered end (49) of the nozzle (20), the intermediate component (36) being axially shiftable in respect of the nozzle end, an innermost component (43) having a lowest portion (45) of spheric cap shape and projections (46) circunferentially spaced. A delivery fitting, according to claim 1, characterized in that the nozzle (20) is a one-piece with the innermost component (43). A delivery fitting, according to claim 1, characterized in that a covering (119) is over and around the locking nut 17 engaging the edege (18) of the delivery fitting, said covering having a projection (120) which extends into the inlet body (12) to completely cover the discharge opening (26) and having a cap (123) with lateral openings (124) communicating with the main body city (125). A delivery fitting, according to claim 8, characterized in that the projection (120) has an innermost edge (121) housed in an annular groove (122) of a flange (127) located in the inlet body cavity.

Inventors: TOSON CARLO, TOSON, CARLO
Applicants: MARIANI RUBINETTERIE, RUBINETTERIE MARIANI S.P.A.
Application year: 1990
Main classification: A61H33
IPC codes: A61H33