Patent Publication Number: US-4254914-A

Title: Pulsating shower head

Description:
FIELD OF THE INVENTION 
     This invention relates to a shower head from which a regular spray or pulsating spray may be selectively discharged. More particularly this invention relates to a shower head made of molded plastic parts and with simplified means provided therein for directing water flow to one of two alternate sets of spray apertures. 
     BACKGROUND OF THE INVENTION 
     Shower heads typically discharge therefrom a spray of water in a conical pattern. It has also been known to provide the discharge of a pulsating spray stream from a shower head, using a propeller with a shutter for alternatively covering and uncovering a spray outlet to cyclically interrupt flow of water to the discharge apertures. In recent years shower heads have been provided with alternative multiple spray features, namely a usual shower spray or a pulsating shower spray. Such concepts are disclosed, for example, in U.S. Pat. No. 3,801,019 and No. 3,958,754. In such prior disclosures a shutter means is provided that is selectively rotatable about the longitudinal axis of the shower head to direct the inflow water either to one or the other of the two sets of discharge apertures. Such spray-or-pulsating shower heads utilize complex diverter constructions that are costly. 
     Thus, one object of this invention is to provide a shower head that is constructed to selectively discharge therefrom a regular spray or pulsating spray, and which is characterized by simplicity and inexpensiveness of construction. 
     Another object of this invention is to provide an inexpensive shower head for discharging selectively therefrom a regular spray or a pulsating spray, and with control of selectivity between the sprays being achieved by use of a simple, pivotable shaft that pivots about an axis that is transverse to the longitudinal axis of the shower head. 
     And a further object of this invention is to provide an inexpensive shower head for selectively discharging therefrom a regular spray or a pulsating spray, and wherein the principal parts of the shower head are molded, with use of a seal between parts that not only provides sealing with multiple parts, but whose resiliency also provides an axial accommodation, during assembly, for parts of varying dimensions. 
     Further objects and advantages will become apparent to one skilled in the art as the following description of the invention proceeds. 
     BRIEF SUMMARY OF THE INVENTION 
     A shower head for discharging selectively either a regular spray or a pulsating spray is provided in an inexpensive construction. A control for selecting which of the sprays will be discharged is provided by use of a diverter body that has a radial control sleeve defined therein into which inflow water enters, and a diverter shaft pivotly mounted in said control sleeve for directing the inflow water into one of two alternate flow paths that respectively communicate with the respective apertures for the two different sprays. One alternate flow path proceeds outwardly from the control sleeve and outwardly of the diverter body, but the other flow path is through the diverter body. 
     The alternate paths are selected through use of a diagonally disposed seal carried on the pivotable diverter shaft. The diverter shaft is assembled through the side wall of the shower head&#39;s shell, entering the radial control sleeve of the diverter body, and being provided with a snap-on retainer assembled onto said shaft to prevent disassembly. The pulsating spray is secured through use of a propeller driven by angled discharge of water from a spray plate. A single compressible O-ring seal is provided, sealingly engaged by the diverter body, the spray plate, and a sleeve mounting for the spray plate, to obtain multiple seals. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an exploded, partially fragmentary, perspective view of a shower head constructed in accordance with the invention herein; 
     FIG. 2 is a slightly reduced, bottom plan view of the discharge face of the shower head shown in FIG. 1; 
     FIG. 3 is an enlarged, cross-sectional view of the assembled shower head of FIGS. 1 and 2, the cross-section being taken in a vertical plane substantially through the longitudinal axis of the shower head, showing the upstream ball connector in elevation and the control handle in its position for directing water flow to the set of regular spray apertures of the shower head; 
     FIG. 4 is a fragmentary view of a portion of the shower head illustrated in FIG. 3, but showing the control handle in its alternate position for directing water flow to the set of flow apertures from which a pulsating spray is discharged; and 
     FIG. 5 is an end elevational view taken substantially on line 5--5 of FIG. 3, showing the detail of the flow passageway defined between the end of the diverter shaft and the control sleeve of the diverter body. 
    
    
     DESCRIPTION OF THE PREFERRED FORM 
     Referring now to the Figures, the assembled shower head 10 includes an axially elongated body shell 12 having its upstream end provided with female-threaded coupling means for connection to a source of liquid, not shown, which is typically a male-threaded pipe end to which the shower head is to connect. The downstream end of the shower head provides a first set of relatively small apertures 14, adjacent the outer periphery of the shower head, from which a normal shower spray is to be discharged, and a set of centrally located, relatively large flow apertures 16 from which a pulsating shower spray is to be discharged. The shower head 10 provides a control handle 17, which is pivotable about an axis transverse to the longitudinal axis of body 12, between a first position (FIG. 3) in which regular spray discharges from apertures 14, and a second position (FIG. 4) in which a pulsating spray discharges from apertures 16. 
     As seen in FIGS. 1 and 3, the upstream female-threaded coupling means includes a ball connector 18 that provides, integrally as one part, an upstream, female-threaded, coupling portion 20 adapted for connection to a male-threaded pipe end, a bored spacer neck 22, and a downstream, axially bored, pivot ball 24. A molded annular coupling nut 26, of greater inner diameter than pivot ball 24, is assembled onto ball 24, and receives into a groove, provided on its inner-most periphery, a snap-ring retainer 28 constructed for engagement with pivot ball 24. The coupling nut 26 is female-threaded at 30 and adapted for connection to a threaded sleeve portion of the body 12 of the shower head. The outer peripheries of coupling portion 20 and coupling nut 26 are molded with serrations, as shown, to provide for ease in finger manipulation of those parts to effect screw connection or disconnection. 
     Referring now to the body of the shower head, the shower head includes a molded, inverted cup-shaped, axially elongated upstream body shell 12 having a continuous, peripheral, side wall 32 and a molded downstream housing 34 that substantially closes off the downstream end of shell 12, to define therebetween a space in which is located the parts of the shower head shown in detail in FIGS. 1 and 3. The shell 12 and downstream housing 34 are assembled and held together by three, symmetrically-disposed, elongated bolts 36, whose respective heads seat against a fiber washer 36a supported on recessed shoulders 38 provided in shell 32, and whose threaded stems screw into tapped bosses 40 provided integrally on downstream housing 34. 
     The shell 12 has an open downstream end bounded by a continuous side wall 32 whose inner periphery at 42, adjacent the downstream end of the side wall, is frusto-conical as shown, tapering inwardly in an upstream direction. The downstream housing 34 is constructed and arranged for telescopic entry through the shell&#39;s open, downstream end, and has a downstream transverse wall 44 constructed with a frusto-conical shape 46 at its peripheral edge, and with a set of equally spaced flow grooves 46a formed therein. The wall 46 cooperates with the frusto-conical periphery 42 of the shell&#39;s side wall, so that the flow grooves provide the set of small spray apertures 14. 
     Extending upstream of transverse wall is an elongated sleeve 48 that surrounds a flow chamber 50 which communicates with the second set of flow apertures 16. The exterior of sleeve 48 is integral with bosses 40 for rigidification. The upstream end of sleeve 48 is shouldered at 51 to provide a seat thereon. Means are provided within the flow chamber 50 for providing pulsating character to the water flow that discharges through flow apertures 16. Such means includes a downstream propeller 52 and an upstream nozzle plate member 54 seated on shoulder 51. 
     The propeller 52 and nozzle plate 54 are generally of the type disclosed in co-pending application, Ser. No. 5,161 filed Jan. 22, 1979, but with some specific differences. 
     In the specific construction illustrated, the propeller 52 has a central shaft 56 that extends axially beyond the propeller&#39;s blades. The propeller 52 is an integral part molded of plastic, such as Delrin, and includes central shaft 56 from which project six (6) radially extending, equally cylindrically-spaced vanes 58, with an incomplete transverse web portion 60 located at the downstream end of propeller 52 and integral with downstream edges of some of vanes 58, to provide both a shutter 60 or flow-through spaces as shown. The lowermost side 52a of the web portion of propeller 52 must be flat and smooth. 
     The upstream side of transverse wall 44 is provided with a recess 44a for receiving thereinto the downstream shaft extension 56a. A thin, anti-friction, washer 62 of teflon is positioned between propeller 52 and the upstream side of transverse wall 44. 
     The nozzle plate 54 includes a transverse wall 64 that is shaped and arranged to provide jet-forming nozzles therein, which direct flow of water at an angled attitude, downwardly and tangentially, against the vanes 58 of the propeller 52, to cause the propeller to rotate. Passage of the web portion 60 across the upstream end of the flow apertures 16, during rotation of propeller 52, operates to interrupt flow through such apertures 16 and gives the effect of a pulsating jet being discharged from flow apertures 16. 
     The wall 64 of nozzle plate 54 is formed with six (6) upstream axial flow apertures 66 that communicate adjacent their downstream ends with laterally opening, discharge apertures 68 to provide the necessary turning of water flow to achieve the desired downwardly inclined and tangential effect angled against the vanes 58 of the propeller 52. 
     Extending downstream from the central portion of wall 64 is a sleeve 72 which is positioned to receive thereinto the upstream extension 56b of shaft 56. Extending upstream of wall 64 are a plurality of angle-shaped abutments 74 each having a horizontal leg 74a and a vertical leg 74b which operate to define a recess for receiving a centering sleeve that is provided on the downstream end of the diverter body hereinafter described. The nozzle plate 54 has an outwardly-extending flange 76 of a radial size adapted for seating on the shoulder 51, and a radially-inwardly located and upstream-extending flange 78 spaced from the upper end of sleeve 48 to provide a recess therebetween for receiving thereinto an O-ring seal 80 that is seated between flange 78 and the upper end portion of sleeve 48 with a portion of O-ring 80 extending upstream of flange 78, as seen in FIG. 3. 
     The space that surrounds sleeve 48 constitutes a chamber, or upstream flow passageway, 82 that communicates water flow therethrough to the first set of spray discharge apertures 14. 
     The body shell 12 is provided with an axially extending, elongated tubular inlet sleeve 84 that projects both upstream and downstream of the shell&#39;s dome 86. The upstream terminus of inlet sleeve 84 is male-threaded for cooperation with nut 26. The downstream terminus of inlet tube 84 provides a stop or abutment for a diverter body, generally indicated at 88. Body shell 12 is also provided with a radially disposed sleeve 90 whose radial axis projects to intersect a projection of the axis of inlet sleeve 84. 
     The diverter body 88 includes a downstream disc or plate 92 that is of a dimension to engage and seal against the uppermost portion of O-ring 80 to effect a continuous compression seal thereagainst. Spaced inwardly of the edge of disc 92 is a depending sleeve, or flange, 93 that is spaced concentrically inwardly of upstream extending flange 78 on nozzle plate 54 and outwardly of legs 74b. The resiliency of O-ring 80 accommodates a range of compression thereof as housing 34 telescopes into body shell 32 under the tension imposed by assembly bolts 36. 
     The diverter body 88 is shaped and arranged to provide thereon, upstream of disc 92, an elongated, radially-extending, control sleeve 94 open at both ends, an annular abutment disc 96, and an upstream extending entry-flow sleeve 98. The entry-flow sleeve 98 is of an external diameter less than the inner diameter of inlet tube 84 on the body shell 12. The entry-flow sleeve 98 is in flow communication with the interior of control sleeve 94 through water inlets 99 that extend through the upstream wall of said control sleeve 94. The downstream wall of control sleeve 94 is provided with water outlets 100. The water inlets 99 and outlets 100 in control sleeve 94 are radially offset from each other to cooperate with a flow diverter shaft as illustrated in FIGS. 3 and 4. 
     The radially disposed sleeve 90 through the side wall 32 of body shell 12 defines a cylindrical inner wall 102. The control handle 17 is shaped and arranged to have extending therefrom an elongated diverter shaft 104, a portion of which is constructed to enter the diverter control sleeve 94 to cooperate with the water inlets 99 and outlets 100 provided therein. The combined handle 17 and diverter shaft 104 is a molded body that provides thereon a radially-outermost recess 106 for receiving therein a first O-ring seal 108 of a size selected for rotary sealing engagement with the cylindrical wall 102 of sleeve 90. Spaced radially inwardly along the diverter shaft 104 is a reduced shaft portion 110, located inwardly of shell side wall 32, and onto which a snap-on retainer 112 may be pressfit. The retainer 112 is of a size to cause interference with and engage the inner side of wall 32, thereby preventing the diverter shaft 104 from being withdrawn from sleeve 90. The retainer 112 is provided with a stem 113 which permits of manual manipulation of the retainer 112 after diverter shaft 104 has been assembled with diverter body 88 and before downstream housing 34 has been telescoped and assembled into body shell 12. Spaced radially inwardly of reduced shaft portion 110, there is a second seal portion provided with a recess 114, in which is positioned a second O-ring seal 116. The seal 116 rotatably and sealingly engages the inner circular wall of control sleeve 94 at a region radially outwardly of outlet 100, so that water entering control sleeve 94 will not exit therefrom past seal 116. At the end of diverter shaft 104 distally of control handle 17, the diverter shaft 104 is provided with four (4) radially-extending ribs 118 which serve to center said distal end of diverter shaft 104 within the control sleeve 94. The spaces 120 between the ribs 116, as best seen in FIG. 5, provide a flow passageway that may receive water from inlets 99 for communicating inlet flow to chamber 82. Between said distal end of diverter shaft 104 and the portion of the diverter shaft that carries seal 116 there is provided on the diverter shaft a pair of spaced diagonal ribs 122 defining a diagonal groove, or recess, 124 within which is located a diverting O-ring seal 126 that when assembled as seen in FIGS. 3 and 4 takes the form of an elongated or ovate circle. 
     The ribs 122 and groove 124 are so arranged that when the handle 17 is in the position shown in FIG. 3, the O-ring seal 126 engages the inner wall of control sleeve 94 to cut off water flow from inlet 99 to outlet 100 and when the handle 17 is in the alternate selected position of FIG. 4, the water flow from inlet 99 is communicated only to outlet 100. Thus, in the flow position in FIG. 3 water from inlet 99 empties through the spaces 120 at the right-hand end of control sleeve 94 to be communicated to spray apertures 14; and in the flow position of FIG. 4 water from inlet 99 passes through sleeve 94 to outlet 100 for communication to the spray apertures 16. 
     In connection with the flow diverting action of O-ring seal 126, it will be seen that in the flow position of FIG. 3 the seal is between inlet 99 and outlet 100, and in the position of FIG. 4 the seal 126 is between the inlet 100 and the flow outlets 120 at the distal end of diverter shaft 104. 
     The entry-flow sleeve 98 on diverter body 88 is constructed to slidably enter the inlet tube 84 on shell body 12. To prevent seepage between the sleeves 98 and 84, an annular seal body 128 is positioned axially against the upstream terminus of entry-flow sleeve 98 and in engagement with the inner wall of inlet tube 84. The seal body 128 is adapted to have ball 24 of the ball connector 18 abut thereagainst, so that nut 26, in biasing pivot ball 24 against seal body 128, operates to force seal body 128 against both the inner wall of tube 84 and the terminus of entry-flow sleeve 98 to provide seals at both points and with the ball 24. 
     While a particular embodiment of this invention has been shown and described, it will be obvious to those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention and, therefore, it is intended in the appended claims to cover all such changes and modifications which fall within the true spirit and scope of the invention.