High efficiency battery operated water gun

A toy water gun which comprises:

• (a) a housing having the external appearance of a gun which includes a barrel and a handle;
• (b) a water reservoir located within said housing;
• (c) a battery operated pumping system located in said housing, which includes:
• (i) a drive motor;
• (ii) a gear system connected at one end to said drive motor and at the other end to a drive shaft;
• (iii) a drive shaft being drivable from and movably connected to said gear system at one end and connected to a cam at its opposite end;
• (iv) a cam connected to said drive shaft and being drivable thereby and being movably connected to a spring-loaded push rod said cam being a step-function drop off cam capable of loading said push rod and releasing said push rod in a step-function drop off fashion such that spring action will drive said push rod;
• (v) a spring-loaded push rod movably connected to said cam at one end and loadable thereby and connected to a piston at its opposite end;
• (vi) a main spring having adequate tension upon loading and release to drive said push rod;
• (vii) a piston movably connected to said push rod;
• and,
• (viii) an intake valve and an exhaust valve connected to said piston, thereby creating a pump;
• (ix) a return spring which is connected to said piston and pushes the piston against said push rod towards said cam so as to aid in the loading of said push rod and main spring and so as to reduce the electrical energy requirements;
• (d) a pickup tube connected to said intake valve at one end and connected to said water reservoir at the other end;
• (e) a water tube connected at one end to the exhaust valve and at the other end to a spray nozzle;
• (f) a spray nozzle attached to said water tube and located at the end of the barrel of said housing;
• (g) a battery chamber connectively located to said housing;
• (h) electrical circuitry connected to said drive motor and to said battery chamber and including an open circuit/close circuit switch;
• (i) a trigger movably connected to said housing and further connected to said open circuit/closed circuit switch;
• such that when water is placed within said water reservoir, and batteries are placed within said battery chamber and the trigger is pulled, the electrical circuitry is completed within the battery, the aforesaid motor is operated, the motor drives said gears and driveshaft, said cam is rotated and cycled so as to move said push rod back and load same by closing said spring, and upon cycling through its step-function drop off, releasing said push rod and spring such that said spring drives said push rod forward, so as to create a pumping action and so as to pump water from said water reservoir through said intake valve, through said exhaust valve, through said water tube and through said nozzle to create a series of spurts of water drawn from the reservoir and out the end of the nozzle in a repeating water gun fashion.