Bruce M. D’Andrade and Lonnie G. Johnson are credited with the invention of a pinch trigger pump water gun. The patent, titled “Pinch trigger pump water gun,” was filed on September 6, 1990, and granted on December 24, 1991. This invention is a one-piece device designed in the general shape of a gun, featuring a manually operated air pump incorporated into the design. The air pump pressurizes a water reservoir, allowing water to be released through a narrow nozzle when the trigger is engaged. The design is characterized by its simplicity and effectiveness, making it a popular choice for toy water guns. The pressurized water creates a stream that lasts as long as the trigger is held down, or until the pressure equals the ambient air. This invention showcases the inventors’ creativity in combining mechanical engineering principles with playful design to create an enjoyable product for users.
