Patent ID: 8146782

Claim:
A foam head for a propellant container which has a valve plate having inner and outer crimped edges and a valve stem supported by the valve plate and having an axis extending along the valve stem, and a foam dispensing opening that opens out into a receptacle seated directly on the valve stem and resiliently biased so that in an assembled state, said valve stem applies a restoring force in a direction of said axis, the foam head comprising an actuation button located at one side of said axis; a lower portion having an outer diameter approximately equal to an inner diameter of the inner crimped edge; an outer rib located in a lower region of the lower portion at a diametrically opposite side of said axis with respect to a location of the actuation button for engagement from beneath of a lower side of the inner crimped edge, and wherein a lower peripheral region of the lower portion has at least one recess located between said actuation button and said outer rib if projected onto an imaginary plane including the axis and extending through the locations of the actuation button and the outer rib and forming an annular spring which provides an effective restoration force to the foam head by interaction with an inward facing surface of the valve plate during operation, wherein said foam head is configured such that upon actuation of said foam head, said foam head remains joined to said propellant container and is incapable of undesired removal from said propellant container.