Importance

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Abstract

A continuous sprayer has a trigger-actuated piston assembly within a cylinder. The trigger urges the piston assembly distally in the cylinder and a coil spring urges it proximally against action of the trigger. The piston assembly has a plunger portion and a hollow piston rod that extends out through a sliding seal in the cylinder distal end and on which is mounted a spray nozzle. The hollow piston rod contains a shutoff rod that cooperates with a standard spring bias ball valve contained in the plunger. At the distal end of the shutoff rod there is a seal to cause complete shutoff as the rod is urged against a compression spring and mates with a seat in the nut of the nozzle. A shutoff pin at the proximal end of the cylinder contacts the shutoff rod when the trigger is completely released and the piston assembly travels to its extreme proximal position. When the handle is fully released, the plunger is forced back by the coil spring, causing the shutoff pin to come in contact with the shutoff rod, to urge the shutoff rod forward and cause the seal to mate with the nozzle nut. Shutoff is effected upon full release of the spray trigger, but partially depressing the trigger will permit the pressurized liquid within the cylinder to spray continuously out the nozzle.

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First Claim