Actuating head of a double-acting pump for ejecting a product from a container

• US 20030164385A1
• Filed: 01/10/2003
• Published: 09/04/2003
• Est. Priority Date: 01/10/2002
• Status: Active Grant

• Current Assignee: Aero Pump GmbH Zerstäuberpumpen
• Original Assignee: Aero Pump GmbH Zerstäuberpumpen
• Inventors: Christ, Stefan, Masuzzo, Ettore
• Granted Patent: US 6,824,021 B2
• Time in Patent Office: Days
• US Class Current: 222/321.7
• CPC Class Codes: B05B 11/0067 having a valve seat located downstream the valve element (take precedence)
• CPC Class Codes: B05B 11/0072 A valve member forming part of an outlet opening
• CPC Class Codes: B05B 11/1001 Piston pumps B05B11/1087, B05B11/1088, B05B11/109 take precedence
• CPC Class Codes: B05B 11/1016 the outlet valve having a valve seat located downstream a movable valve element controlled by a pressure actuated controlling element B05B11/1022, B05B11/1023 take precedence

Abstract

An actuating head (12) of a double-acting pump (1) for ejecting a product (38) from a container (2) includes an outlet duct (13a-13d) leading to an ejection opening (16), wherein a closing piece (18) biased by a spring (17) is arranged in the outlet duct. The closing piece (18) directly seals the ejection opening (16) under the force of the spring (17) and the closing piece (18) releases as a result of the pressure exerted when actuating the double-acting pump (1) the flow of the product (38) through the outlet duct (13a-13d) and through the ejection opening (16) against the force of the spring (17). For simplifying the construction and for avoiding the danger of contamination of the product, it is ensured according to the present invention that a first outlet duct section (13d) following the ejection opening (16) is surrounded by a tube (15) in which the closing piece (18) is sealingly slideably guided and which is inserted in a bore (14) in the body of the actuating head (12), wherein the bore (14) defines between itself and the tube (15) an annular space forming a second outlet duct section (13b), wherein the annular space is connected through a third outlet duct section (13c) traversing the wall of the tube (15) to the first outlet duct section (13d).

Claims

1. Actuating head (12) of a double-acting pump (1) for ejecting a product (38) from a container (2), wherein the actuating head (12) has an outlet duct (13a-13d) leading to an ejection opening (16), wherein a closing piece (18) biased by a spring (17) is arranged in the outlet duct, wherein the closing piece (18) in its closed position directly seals off the ejection opening (16) under the force of the spring (17) and wherein the closing piece (18) releases the flow of the product (38) through the outlet duct (13a-13d) and through the ejection opening (16) as a result of the pressure occurring during actuation of the double-acting pump (1) against the force of the spring (17), characterized in that a first outlet duct section (13d) following the ejection opening (16) is surrounded by a tube (15) in which the closing piece (18) is sealingly slidingly guided and which is placed in a bore (14) in the body of the actuating head (12), wherein the bore (14) defines between itself and the tube (15) an annular space forming a second outlet duct section (13b), wherein the annular space is connected to the first outlet duct section (13d) through a third outlet duct section (13c) which traverses the wall of the tube (15).

2. Actuating head according to claim 1, characterized in that the closing piece (18) has a piston (19) which seals against the inner side of the outlet duct (13a-13d), wherein the piston (19) has a piston rod (20) which in the closed position of the closing piece (18) protrudes with an end portion (20a) tightly in the ejection opening (16).

3. Actuating head according to claim 2, characterized in that the portion (20b) of the piston rod (20) adjacent the end portion (20a) has a greater diameter than the ejection opening (16) and in the closed position of the closing piece (18) the portion (20b) rests against the inner rim of the ejection opening (16) under the force of the spring (17).

4. Actuating head according to claims 2 or 3, characterized in that the piston (19) has a circumferential sealing lip (21) which permits passage of a medium only in the direction toward the ejection opening (16).

5. Actuating head according to claim 4, characterized in that the sealing lip (21) is formed by a cup-shaped material.

6. Actuating head according to one of claims 1 to 5, characterized in that the closing piece (18) is of a rubber-elastic material with an excess dimension of the end portion (20a) relative to the diameter of the ejection opening (16).

7. Actuating head according to claim 6, characterized in that the rubber-elastic material is a plastic material.