Safety cap for pressure vessels, in particular, a boiler for household appliances and the like

摘要

A safety cap for pressure vessels, particularly boilers for electrical household appliances and the like, which comprises a body (2) that can be screwed onto the mouth (3) of a boiler (4) and the like and is rigidly associable with a support (20) on which a knob (30) is rotatably associable. The particularity of the invention is constituted by the fact that it comprises, between the knob (30) and the support (20), radial coupling means that are adapted to rotationally rigidly couple the knob (30) and the support (20), in the direction for screwing on the cap, and axial coupling means, which are adapted to rotationally rigidly couple the knob (30) and the support (20) by axial compression of the knob (30) with respect to the support (20).