Manually operated gear pump spray head

Claim 1

A manually operated gear pump spray head for spraying the contents of a container to which said spray head is attachable, said container capable of being held in one hand, said spray head comprising: a housing provided with a nozzle; a pair of operatively engaged gears, each rotatable about a respective one of a pair of spaced axes transverse to the axis of said nozzle; a manually activated trigger operable, with the same hand holding said container, between a neutral position and a depressed position for activating said spray head; a ratchet wheel axially secured to one of said gears; pawl means interposed between said trigger and said ratchet wheel for rotating the latter upon movement of said trigger toward its depressed position; a spring means for returning said trigger to its neutral position; vent tube means for providing a passage between the interior of said container and the ambient environment; and a seal between said trigger and said pawl for closing said passage when said trigger is in its neutral position and for opening said passage when said trigger is in its depressed position.