Patent ID: 6299029
Filing Date: 2001-10-09
Classification: B05B

Abstract:
A pump of type comprising a moving member mounted to move relative to a support, the moving member having a central duct into which the substance to be dispensed penetrates via at least one opening, the support cooperating with the moving member to define a variable volume pump chamber around said central duct, the pump also having a diaphragm having a central portion in the form of a sleeve that is open at its top end and closed at its bottom end, said central duct being inserted in said central portion, the diaphragm being organized in such a manner as to isolate the opening(s) of the pump chamber when the volume of the pump chamber increases arid the substance is sucked into it, wherein the bottom portion of the central portion of the diaphragm presents, at least over a sector of its periphery, a preferred deformation zone.