Abstract: Diffusion device intended to accept a flanged capsule containing a product that is to be diffused comprising a body, a bearing surface borne by the body directly or indirectly, an outlet passage for letting product out of the capsule, a knob mounted with the ability to rotate on the body, the knob comprising an upper part projecting axially beyond the bearing surface, the knob and the bearing surface being mounted with the capacity for helicoidal rotation relative to one another, a closure movement of the knob being able to bring the lower face of a rim of the device to face the bearing surface, the closure movement of the knob comprising a rotational movement of the knob with respect to the body causing a helicoidal movement between the knob and the bearing surface that is able to bring a lower face of the rim and the bearing surface closer together.

Abstract: Diffusion device intended to accept a flanged capsule containing a product that is to be diffused comprising a body, a bearing surface borne by the body directly or indirectly, an outlet passage for letting product out of the capsule, a knob mounted with the ability to rotate on the body, the knob comprising an upper part projecting axially beyond the bearing surface, the knob and the bearing surface being mounted with the capacity for helicoidal rotation relative to one another, a closure movement of the knob being able to bring the lower face of a rim of the device to face the bearing surface, the closure movement of the knob comprising a rotational movement of the knob with respect to the body causing a helicoidal movement between the knob and the bearing surface that is able to bring a lower face of the rim and the bearing surface closer together.