Piston-powered dispensing system

• Main Authors: CRAPSER, JAMES R, MILLER, ALLAN D, WEFLER, MARK E, BUHLER, JAMES E
• Format: Patent
• Language: English; French; German
• Published: 16.08.1989
• Subjects: APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; ATOMISING APPARATUS; MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING; NOZZLES; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SPRAYING APPARATUS; SPRAYING OR ATOMISING IN GENERAL; TRANSPORTING

A piston-powered fluid-dispensing system (20) is disclosed. The fluid dispensing system (20) comprises an apertured base (22), a hollow elongated cylinder (24A), an apertured piston (26), an orificed overcap (28A), an elongated fluid passageway (30A), and three valves (34, 36A, 38A). The elongated cylinder (24A) defines a longitudinal axis (x-x). The elongated cylinder (24A) carries the base (22) at one end portion thereof and further defining a hollow neck at the opposite end portion thereof. The apertured piston (26) defines a circumferential portion (44) that is slidably engageable with the hollow cylinder (24A) substantially along the length of an inner surface thereof, and the piston (26) is disposed in the cylinder (24A) for dividing the cylinder into at least two chambers (46A, 48A). The orificed overcap (28A) is carried by the cylinder (24A) and is rotatable about the longitudinal axis, relative to the cylinder (24A). The overcap (28A) defines a throat (62A) that is slidably engageable with an inner surface portion of the cylinder neck (42A). Rotation of either the overcap (28A) or cylinder (24A) relative to the other, about the longitudinal axis, provides movement of the throat (62A) relative to the cylinder neck (42A) along the longitudinal axis. The throat (62A) carries means for providing fluid communication between one of the two cylinder chambers (46A, 40A) and a fluid-mixing region. The fluid passageway (30A) is carried by the overcap (28A) and is disposed through the piston aperture in a fluid-tight manner. A first valve (34) is carried by the base. A second valve (36A) is carried by the fluid passageway (30A) and abuttingly engages the first valve (34). The third valve (38A) is provided by movement along the longitudinal axis of the throat relative to the cylinder neck.