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AssigneeRansburg Corporation
InventorsThomas E. Grime, Roger T. Cedoz, Roger D. Wheeler, John F. Schaupp
Estimating the term…
An improved hand held spray gun. The spray gun includes at least one manual trigger which when squeezed moves a valve needle to initiate fluid flow. A knob is provided to adjust the maximum fluid flow when the trigger is squeezed. When the trigger is released, a compression spring returns the valve needle to its closed position. An over travel spring is compressed only if an excessive force is applied to the trigger to prevent damage to the spray gun. The over travel spring is stronger than the valve needle return spring so that it compresses only after the spray gun is fully on. If the maximum fluid flow adjustment knob is turned too far, compressed air is vented through the knob as a tactile warning to the spray gun operator to not turn the knob further. The vented air also may whistle to provide an audible warning that the knob should not be turned further.
In a hand held spray gun having a fluid valve including a trigger moveable between a released position and a set maximum fluid flow position, a valve needle, means for moving said valve needle from a closed position to an open position when said trigger is moved from the released position to the set maximum fluid flow position, a return spring urging said valve needle to said closed position, and adjustable stop means for adjusting the open position of said valve needle to set the maximum fluid flow from said spray gun, said return spring compressing when said valve needle is moved to the open position, the improvement comprising an over travel compression spring having a compressive force greater than the compressive force of said return spring, and means positioning said over travel spring in said spray gun to be compressed when an excessive force is applied to said trigger to move said trigger from the released position past the set maximum fluid flow position whereby said over travel spring prevents damage to said spray gun.
In a paint spray gun having a fluid valve including a trigger, a valve needle which is moved from a closed position to an open position when said trigger is squeezed, a return spring urging said valve needle to the closed position and an adjustable stop for adjusting the open position of said valve needle, the improvement comprising a compression spring positioned between an end of said valve needle and said adjustable stop, said compression spring contacting said valve needle end and said stop when said valve needle is moved by said trigger to the open position, and wherein said compression spring is appreciably stronger than said return spring whereby said compression spring is compressed only when an excessive force is applied to said trigger.
Dependencies are inferred from the claim text.