US 4,905,906 AGranted

Continuous sprayer

AssigneeD. B. Smith and Company, Inc.

InventorEdwin W. Trefzger

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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.

Claims8

Dependent claims

A continuous flow sprayer device with positive cutoff, comprising a housing having a handle;

a cylinder within said housing;
a supply conduit for carrying to said cylinder at a proximal end thereof a liquid to be sprayed and including check valve means permitting flow of said liquid only from said conduit into said cylinder;
a piston assembly which travels proximally-distally in said cylinder and including a plunger which contacts the wall of said cylinder, a hollow tubular piston rod that extends distally from said plunger and passes distally out of said cylinder through a sliding seal in a distal end thereof, a one-way valve in said plunger admitting fluid flow only in the distal direction into said hollow piston rod, and an opening in said hollow piston rod to permit fluid communication between said rod and an annular chamber defined by the portion of said cylinder distal of said plunger;
a spray nozzle on said hollow piston rod distal of said cylinder;
a squeeze trigger adjacent said handle and rockably mounted with respect to said housing including linkage means for urging said piston assembly distally when said trigger is squeezed;
resilient means for urging said piston assembly proximally when said trigger is released;
and shutoff means to block flow of said liquid through said hollow piston rod and out of said nozzle when said trigger is completely released, but which permits flow out through said nozzle when said trigger is at least partially squeezed.

4 more elements

Dependencies are inferred from the claim text.