Liquid material dispenser
First Claim
1. A liquid material dispenser, comprising:
- a housing including a reservoir for liquid to be dispensed, an outlet through which the liquid is dispensed, and a connecting passageway between said reservoir and said outlet;
a reciprocatable pumping member in the passageway, such that one side of the pumping member defines a pumping chamber with the passageway, and another side defines a pressure-control chamber, said pumping member being cyclically displaceable through forward and return strokes for pumping liquid from said reservoir to said outlet;
valve means in said passageway effective, during one of said strokes, to cause the pumping member to draw liquid from said reservoir into said pumping chamber, and during the other of said strokes, to cause the pumping member to pump liquid from said pumping chamber through said outlet;
feeding means for feeding a gas at a preselected time and rate to said pressure-control chamber to drive the pumping member through one of said strokes; and
a slow-acting vent for venting the gas from said pressure-control chamber continuously at a rate lower than said gas feeding rate, to drive the pumping member through the other of said strokes.
2 Assignments
0 Petitions
Accused Products
Abstract
A liquid material dispenser includes a housing formed with a reservoir for the liquid to be dispensed, an outlet through which the liquid is to be dispensed, and a connecting passageway between the reservoir and the outlet. A diaphgram is located in a cavity in the passageway such that one side of the diaphragm defines a pumping chamber, and the other side defines a control chamber. An electrolytic cell generates a gas to the control chamber according to the quantity of electrical current passed through the electrolyte, for driving the diaphragm through forward strokes to pump liquid to the outlet; and a slow-acting vent vents the gas from the control chamber to the atmosphere at a rate lower than that of generation of gas by the electrolytic cell, for driving the diaphragm through return strokes to refill the pumping chamber.
98 Citations
20 Claims
-
1. A liquid material dispenser, comprising:
-
a housing including a reservoir for liquid to be dispensed, an outlet through which the liquid is dispensed, and a connecting passageway between said reservoir and said outlet; a reciprocatable pumping member in the passageway, such that one side of the pumping member defines a pumping chamber with the passageway, and another side defines a pressure-control chamber, said pumping member being cyclically displaceable through forward and return strokes for pumping liquid from said reservoir to said outlet; valve means in said passageway effective, during one of said strokes, to cause the pumping member to draw liquid from said reservoir into said pumping chamber, and during the other of said strokes, to cause the pumping member to pump liquid from said pumping chamber through said outlet; feeding means for feeding a gas at a preselected time and rate to said pressure-control chamber to drive the pumping member through one of said strokes; and a slow-acting vent for venting the gas from said pressure-control chamber continuously at a rate lower than said gas feeding rate, to drive the pumping member through the other of said strokes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A liquid material dispenser, comprising:
-
a housing including a reservoir for liquid to be dispensed, an outlet through which the liquid is to be dispensed, and a connecting passageway between said reservoir and said outlet; a diaphgram in the passageway such that one side of the diaphragm defines a pumping chamber, and another side defines a pressure-control chamber; an electrolytic cell communicating with said control chamber and including electrodes and an electrolyte which generates a gas according to the quantity of electrical current passed through said electrolyte, for driving said diaphragm through forward strokes; a slow-acting vent for venting the gas from said pressure-control chamber at a rate lower than that of generation of gas by said electrolytic cell, for driving the diaphragm through return strokes; and valve means in said passageway causing the diaphragm to pump liquid from said pumping chamber through said outlet during said forward strokes, and to draw liquid from said resrvoir into said pumping chamber during said return strokes. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification