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US 6,554,588 B1Granted
Composite piston for a vibration pump
AssigneeUlka Srl
InventorCalogero DiBenedetto
Life of this patent
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Abstract
A composite piston (30) for a vibration pump comprises a core (32), activating a piston, and a piston (34) made of plastic and obtained by means of molding on an insert formed by the core (32). The composite piston (30) thus obtained achieves objects of high precision at a low cost which cannot be achieved with traditional simple pistons made entirely of ferromagnetic metal.
Claims16
Composite piston (30, 30a) for a vibration pump with an electromagnetic drive comprising:
- a core (32, 32a) which is made of ferromagnetic metallic material limited in extension to the piston zone intended to perform the magnetic driving function,
- a piston (34, 34a) which is made of non-metallic and non-ferromagnetic material and performs the pumping function,
- the metal core (32, 32a) performing the magnetic moving function being made of stainless steel possessing ferromagnetic properties, characterized in that:
- the piston (34, 34a) performing the pumping function is made of a plastic material moulded on the metal core (32, 32a) and inserted with a part thereof, consisting of a cylindrical blank (36, 36a) in an axial bore (40, 40a) provided with an upset bottom rim (41) which rests against a bottom side of the metal core (32) and a projecting collar (42) which is housed inside a circumferential cavity (44) of the said metal core (32).
1 more element
Dependencies are inferred from the claim text.