Patent ID: 7464885

Claim:
A spraying head assembly comprising: a body being tubular and having a connecting end; a spraying end; a connecting tube being formed on and protruding from the connecting end; a connecting channel defined through the connecting tube and having a diameter; and a chamber defined in the spraying end, communicating with the connecting channel and having an inner surface and a diameter larger than that of the channel to define a shoulder between the chamber and the connecting channel; a cap attached to the spraying end of the body and having a spraying end; a connecting end connected with the spraying end of the body; a spraying channel defined axially in the cap; a conical cavity defined concavely inside the cap and communicating with the spraying channel; and a spraying hole defined in the spraying end of the cap and communicating with the conical cavity; an upper plug being mounted in the chamber in the body and comprising a spraying end; a connecting end; a head being smaller then the chamber so defining a gap between the head and the inner surface of the chamber and being formed on the spraying end of the upper plug and having a top abutting the cap; a bottom; a recess defined in the top of the head, communicating with the spraying channel in the cap and having a conical bottom formed convexly in the recess; and multiple passages being formed through the head and communicating with the recess and the gap between the head and the inner surface of the chamber; and a shaft being formed on and protruding from the bottom of the head; a lower plug being mounted movably in the chamber in the body, connected to the upper plug and having a top; a bottom; a post being formed on the top of the lower plug; and a sealing block being formed on the bottom of the lower plug to selectively close the connecting channel in the body; and a spring connected between the upper plug and the lower plug and having an upper end mounted around the shaft on the upper plug; and a lower end mounted around the post on the lower plug.