Coating implements with material supply – Including means to apply material-moving force – Piston-provided reservoir
Reexamination Certificate
1999-06-18
2001-03-13
Walczak, David J. (Department: 3751)
Coating implements with material supply
Including means to apply material-moving force
Piston-provided reservoir
C401S151000, C401S171000, C401S176000, C417S460000
Reexamination Certificate
active
06200055
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to manually operated dispenser devices, and in particular, to a manually operated dispenser device for metering doses of viscous materials such as nail polish, lipstick, foundation, makeup and the like.
BACKGROUND OF THE INVENTION
There are many known dispenser devices for dispensing viscous material. Such devices have been employed in a variety of applications for discharging many different types of viscous materials. A common application for dispensers of this kind is in the field of cosmetic applicators. Typical cosmetic applicators are pen-like in design and dispense a cosmetic fluid onto an integrally disposed applicator when actuated by the user.
Pen-like fluid dispensing devices for manual user operation, especially those devices used for dispensing cosmetic fluids, must be capable of being fabricated inexpensively from readily available materials. In addition to the importance of minimizing manufacturing costs, it is equally important that such devices be fabricated to close tolerances in order to ensure proper fit and cooperative inter-engagement between both fixed and relatively movable parts, and to provide for reliable operation of the dispenser throughout its intended useful life which is usually until the initial supply of stored fluid is exhausted. In the case of cosmetic fluid dispensers, assuring continued operative reliability is much more difficult. This is because cosmetic fluids such as nail enamels, are relatively caustic to many common construction materials and quickly thicken and harden in the absence of adequate fluid tight seals, makes continued operative reliability much more difficult.
Typical known and commercially available dispenser devices commonly employ relatively complex mechanical designs which use large numbers of mutually engaging parts that must all cooperatively interact in order for the device to operate. Dispenser devices of this type are usually difficult and expensive to manufacture and often exhibit high failure rates as the devices approach the end or latter portion of their intended, useful lives. Moreover, many of these devices are difficult to operate.
Accordingly, there is a need for a dispenser device for dispensing metered doses of viscous material with enhanced reliability and ease of operation.
SUMMARY OF THE INVENTION
A dispensing device comprising a pump assembly for pumping out the viscous liquid material stored in the device. The pump includes a cylinder and a piston disposed within the cylinder, wherein the cylinder has a cylinder inlet valve and the piston has a cylinder outlet valve. Each operation of the pump assembly causes the piston to move in a first direction toward the cylinder inlet valve and in a second direction away from the cylinder inlet valve. The movement of the piston in the first direction causes the cylinder inlet valve to close and the cylinder outlet valve to open. The movement of the piston in the second direction causes the cylinder inlet valve to open and the cylinder outlet valve to close. When the pump assembly is primed with viscous liquid material, movement of the piston in the first direction pumps a predetermined volume of the viscous liquid material from the cylinder through the opened cylinder outlet valve, thereby causing a substantially corresponding predetermined volume of the viscous liquid material to be dispensed by the device. Movement of the piston in the second direction draws a substantially corresponding predetermined volume of the viscous liquid material from the device into the cylinder through the opened inlet valve thereby refilling the cylinder with the viscous material.
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Buchanan & Ingersoll PC
Plevy Arthur L.
Stephen Gould Corporation
Walczak David J.
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