Patent ID: 8672190
Filing Date: 2014-03-18
Classification: B05B,F04B

Abstract:
1. A spray head assembly comprising: a press head having a nozzle, a first connection portion and an extension portion which is located around the first connection portion, a reception area defined between the first connection portion and the extension portion, an annular face defined in an inner periphery of the reception area; a seal member being a hollow part and having an inner tube portion and a water-proof portion, the inner tube portion inserted into the reception area and a top of the inner tube portion being engaged with the annular face to form a seal status, the inner tube portion having a first locking portion located therein and the water-proof portion located on outside of the inner tube portion, an inner wall of the water-proof portion being higher than an outer periphery of the seal member; a push tube being a hollow tube and extending through the seal member, the push tube having a first tube, a second tube and an engaging portion, the first tube having a second connection portion and a second locking portion, the push tube connected to the press head by connecting the second connection portion to the first connection portion, the second locking portion connected to the first locking portion; a piston unit having a piston and a main rod, the piston being a hollow part and mounted to the second tube, the piston having an annular portion on an end thereof, a contact portion of the main rod movably contacting the annular portion so as to define an outlet between the annular portion and the contact portion, the main rod having multiple axial grooves defined in an outside thereof and a seal part connected to a lower end of the main rod; a resilient member mounted to the push tube and an end of the resilient member contacting an underside of the inner tube portion; a cylinder unit connected to the seal member and a mount located between the seal member and the cylinder unit, the cylinder unit having a first cylinder, a second cylinder and a narrowed portion, the piston movably inserted in the first cylinder and defining a chamber in the first cylinder; the narrowed portion located between the first and second cylinders, the narrowed portion engaged with the seal part to form a sealed status, and a valve contacting an inlet of the second cylinder.