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Toy water guns include a housing supporting a liquid storage chamber, a conduit for establishing fluid communication between the chamber and a discharge orifice disposed proximate a front end of the housing, a trigger mechanism, a fluid transfer system adapted to develop forces for causing a continu

Toy water guns include a housing supporting a liquid storage chamber, a conduit for establishing fluid communication between the chamber and a discharge orifice disposed proximate a front end of the housing, a trigger mechanism, a fluid transfer system adapted to develop forces for causing a continuous or pulsed stream of liquid to flow through the conduit and out of the discharge orifice when the trigger is pressed. A first embodiment employs a rotatable nozzle assembly that is dimensioned and arranged to spin as it receives a stream of liquid via the conduit. The nozzle assembly ejects a stream of liquid as it spins to thereby obtain a helical "tornado" flow pattern. In a second embodiment, a fixed or movable deflector is used so that water exiting a nozzle strikes a surface of the deflector to thereby develop a "wave" or "hard rain" discharge pattern. Multiple modes of operation are also contemplated.

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What is claimed is: 1. A toy water gun, comprising: a housing having a front end and a rear end; a chamber supported by said housing for containing a liquid; a conduit for establishing fluid communication between said chamber and a discharge orifice disposed proximate a front end of said housing; a

What is claimed is: 1. A toy water gun, comprising: a housing having a front end and a rear end; a chamber supported by said housing for containing a liquid; a conduit for establishing fluid communication between said chamber and a discharge orifice disposed proximate a front end of said housing; a trigger mechanism comprising a trigger and at least one resilient spring; a fluid transfer system operative to develop forces for causing a stream of liquid to flow through said conduit and out of said discharge orifice upon actuation of said trigger mechanism; and a rotatable nozzle assembly dimensioned and arranged to spin in a single direction about an axis of rotation while receiving a stream of liquid via the discharge orifice, said rotatable nozzle assembly having a cup-shaped portion formed by an end wall and a circumferential wall of said nozzle assembly, said end wall and said circumferential wall of said cup-shaped portion forming sides of an interior cavity in fluid communication with said discharge orifice such that fluid exiting said discharge orifice enters and fills said interior cavity, a nozzle through-hole is disposed in said bottom wall in communication with said interior cavity and offset from said axis of rotation, wherein said nozzle assembly ejects the stream of liquid from said interior cavity through said through-hole as said nozzle assembly ejects the stream of liquid from said interior cavity through said through-hole as said nozzle assembly spins to thereby obtain a helical flow pattern when said housing is held steady, said nozzle assembly being driven to rotate in said single direction by one of a motorized drive assembly and energy imparted by moving liquid; wherein said nozzle assembly further includes a pivotably movable nozzle member offset from the axis of rotation, said nozzle member having a distal section defining a nozzle orifice and a substantially spherical proximal section retained in fluid communication with said through-hole, whereby a user can adjust at least one of a diameter and a pitch of said helical flow pattern. 2. The toy water gun of claim 1, wherein said nozzle assembly further includes a plurality of vanes disposed within said interior cavity, said vanes being dimensioned and arranged to convert energy imparted by liquid impinging thereon into forces driving rotary motion of said nozzle assembly. 3. The toy water gun of claim 1, wherein said nozzle assembly further includes a nozzle member in fluid communication with said discharge orifice and offset from said axis of rotation. 4. The toy water gun of claim 3, wherein said nozzle member is pivotably movable so that a user can adjust a pitch of said helical flow pattern. 5. The toy water gun of claim 1, wherein said fluid transfer system comprises a manually operable pump configured to pressurize said chamber. 6. The toy water gun of claim 1, wherein said chamber defines a threaded fill opening, said toy water gun further comprising a threaded fill cap adapted for mating engagement with the chamber and defining a one-way valve for allowing a pressurized fluid to enter said chamber. 7. The toy water gun of claim 1, wherein said water gun is operative in a second mode in which said rotatable nozzle assembly remains stationary while liquid is ejected therefrom. 8. The toy water gun of claim 1, wherein said trigger mechanism is operative in a first mode, in which liquid flows continuously from said rotatable nozzle assembly for so long as said trigger is maintained in a first position and in a second mode, in which a short burst of liquid flows when the trigger is depressed into a second position. 9. The toy water gun of claim 1, wherein said nozzle assembly further includes a flow director assembly adapted to receive liquid arriving via the discharge orifice and to change a direction of flow so as to cause arriving liquid to impinge upon said vanes. 10. The toy water gun of claim 1, wherein said chamber defines a threaded fill opening, said toy water gun further comprising a threaded fill cap adapted for mating engagement with the chamber and defining a one-way valve for allowing a pressurized fluid to enter said chamber. 11. The toy water gun of claim 1, wherein said water gun is operative in a second mode in which said rotatable nozzle assembly remains stationary while liquid is ejected therefrom. 12. A toy water gun, comprising: a housing having a front end and a rear end; a chamber supported by said housing for containing a liquid; a conduit for establishing fluid communication between said chamber and a discharge orifice disposed proximate a front end of said housing; a trigger mechanism comprising a trigger and at least one resilient spring; a fluid transfer system operative to develop forces for causing a stream of liquid to flow through said conduit and out of said discharge orifice upon actuation of said trigger mechanism; and a rotatable nozzle assembly dimensioned and arranged to spin in a single direction about an axis of rotation while receiving a stream of liquid via the discharge orifice stream of liquid as it spins to thereby obtain a helical flow pattern, said nozzle assembly being driven to rotate in said single direction by one of a motorized drive assembly and energy imparted by moving liquid, wherein said nozzle assembly includes a first section defining an interior cavity, said first section further defining an inlet opening dimensioned and arranged to establish fluid communication between the interior cavity and said conduit discharge orifice, and an outlet opening dimensioned and arranged to allow fluid under pressure to exit said interior cavity as a stream as said first section spins, wherein said nozzle assembly further includes a pivotably movable nozzle member offset from the axis of rotation, said nozzle member having a nozzle orifice and a substantially spherical insert portion pivotably retained in said outlet opening, wherein a pivotable position of said nozzle member is controlled to produce a desired diameter and a desired pitch of said helical flow pattern. 13. The toy water gun of claim 12, wherein said nozzle assembly further includes a flow director assembly adapted to receive liquid arriving via the discharge orifice and to change the direction of flow so as to cause arriving liquid to impinge upon said vanes. 14. A toy water gun, comprising: a housing having a front end and a rear end; a chamber supported by said housing for containing a liquid; a discharge orifice in fluid communication with said chamber; a trigger mechanism; a fluid pressurizing assembly dimensioned and arranged to force a stream of liquid out of the discharge orifice upon actuation of said trigger mechanism; and a rotatable nozzle assembly dimensioned and arranged to spin about an axis of rotation while receiving a stream of liquid via the discharge orifice and to eject a stream of liquid as it spins to obtain a helical flow pattern when the housing is held steady, said rotatable nozzle assembly having a cup-shaped portion formed by an end wall and a circumferential wall of said nozzle assembly, said end wall and said circumferential wall of said cup-shaped portion forming sides of an interior cavity in communication with said discharge orifice such that liquid exiting said discharge orifice enters and fills said interior cavity, said nozzle assembly being driven to rotate by one of a motorized drive assembly and energy imparted by moving liquid, and said nozzle assembly including a nozzle through-hole in said end wall in fluid communication with said interior cavity and offset from said axis of rotation, wherein the ejected stream of liquid passes through said through-hole when the nozzle assembly spins to thereby obtain the helical flow pattern. 15. The toy water gun of claim 14, further including a water turbine assembly for rotating said nozzle assembly in a single direction about said axis of rotation. 16. The toy water gun of claim 14, further including a motorized drive assembly for rotating said nozzle assembly about said axis of rotation. 17. A toy water gun, comprising: a housing having a front end and a rear end; a chamber supported by said housing for containing a liquid; a conduit for establishing fluid communication between said chamber and a discharge orifice disposed proximate a front end of said housing; a trigger mechanism comprising a trigger and at least one resilient spring; a fluid transfer system operative to develop forces for causing a stream of liquid to flow through said conduit and out of said discharge orifice upon actuation of said trigger mechanism; and a rotatable nozzle assembly dimensioned and arranged to spin in a single direction about an axis of rotation while receiving a stream of liquid via the discharge orifice stream of liquid as it spins to thereby obtain a helical flow pattern, said nozzle assembly being driven to rotate in said single direction by one of a motorized drive assembly and energy imparted by moving liquid, wherein said nozzle assembly includes a first section having walls forming sides of an interior cavity in the first section, said first section further defining an inlet opening dimensioned and arranged to establish fluid communication between the interior cavity and said conduit discharge orifice, and an outlet opening dimensioned and arranged to allow fluid under pressure to exit said interior cavity as a stream as said first section spins, wherein said nozzle assembly further includes a plurality of vanes disposed within said-interior cavity, said vanes being dimensioned and arranged to convert energy imparted by liquid impinging thereon into forces driving rotary motion of said first section, and wherein said nozzle assembly further includes a flow director assembly adapted to receive liquid arriving via the discharge orifice and to change a direction of flow so as to cause arriving liquid to impinge upon said vanes. 18. A toy water gun, comprising: a housing having a front end and a rear end; a chamber supported by said housing for containing a liquid; a conduit for establishing fluid communication between said chamber and a discharge orifice disposed proximate a front end of said housing; a trigger mechanism comprising a trigger and at least one resilient spring; a fluid transfer system operative to develop forces for causing a stream of liquid to flow through said conduit and out of said discharge orifice upon actuation of said trigger mechanism; and a rotatable nozzle assembly dimensioned and arranged to spin in a single direction about an axis of rotation while receiving a stream of liquid via the discharge orifice stream of liquid as it spins to thereby obtain a helical flow pattern, said nozzle assembly being driven to rotate in said single direction by one of a motorized drive assembly and energy imparted by moving liquid, wherein said nozzle assembly includes a first section having walls forming sides of an interior cavity in the first section, said first section further defining an inlet opening dimensioned and arranged to establish fluid communication between the interior cavity and said conduit discharge orifice, and an outlet opening dimensioned and arranged to allow fluid under pressure to exit said interior cavity as a stream as said first section spins, wherein said nozzle assembly further includes a plurality of vanes disposed within said-interior cavity, said vanes being dimensioned and arranged to convert energy imparted by liquid impinging thereon into forces driving rotary motion of said first section, and wherein said nozzle assembly further includes a pivotably movable nozzle member offset from the axis of rotation, said nozzle member having a nozzle orifice and a substantially spherical insert portion pivotably retained in said outlet opening, wherein a pivotable position of said nozzle member is controlled to produce a diameter and a pitch of said helical flow pattern.