US Patent 7703180 Pressure botton

A pressure button, of the type comprising a male portion and a female portion, to be applied on flaps to be connected, the female portion comprising a fixing element for fixing an active female element, the latter including a plurality of resilient tabs which are mutually arranged with a ring arrangement about a housing recess for housing a projecting part of the male portion. The active female element of the button comprises an annular body to which a clamp element including a plurality of points projecting outside of the active female element is affixed.