Patent ID: 7871019

Claim:
A pressure-adjustable jet spray nozzle, comprising: a barrel defining a flow passage through front and rear ends thereof; a pressure adjuster, said pressure adjuster comprising an adjustment sleeve sleeved onto said barrel and a front ring affixed to a front end of said adjustment sleeve, said adjustment sleeve having a locating groove extending around the periphery near the front end thereof, said front ring defining a center through hole; a support device, said support device comprising a support ring sleeved onto the front end of said adjustment sleeve, a plurality of ball racks fixedly mounted in said support ring and equiangularly spaced around the periphery of said support ring, each said ball rack having a ball hole, a connection ring surrounding the locating groove of said adjustment sleeve, said connection ring having at least one mounting through hole, an elastic member mounted in the locating groove of said adjustment sleeve, at least one stop block respectively mounted in the at least one mounting through hole of said connection ring and having a bottom side thereof kept in contact with said elastic member which imparts an outward pressure to said at least one stop block, a plurality of steel balls respectively rotatably mounted in the ball holes of said ball racks, and a stop ring fastened to a front end of said support ring; a nozzle head lock control device, said nozzle head lock control device comprising a sliding sleeve sleeved onto said support ring and axially movable between said at least one stop block and said stop ring for forcing said steel balls out of the inside wall of said support ring, and a compression spring sleeved onto said support ring within said sliding sleeve and adapted to impart a forward pressure to said sliding sleeve relative to said support ring; and a nozzle head insertable into said support ring, said nozzle head having a positioning ring fastened to the periphery thereof, said positioning ring having a positioning groove extending around the periphery thereof for receiving said steel balls to lock said nozzle head to said support ring.