Precision dispensing pump for viscous materials
OwnerHarold J. Engelinventor
Life of this patent
Estimating the term…
Abstract
A viscous fluid dispensing pump such as used on the mechanical arms of computer controlled dispensing systems introduces the fluid into the center of a vertical bore having a dispensing tube at the bottom and a variable pitch thread feed screw in the bore rotated by a precision servo motor. An alternate embodiment describes a conical shaped feed screw with linear pitch turning in a conical shaped sleeve in the bore. In both embodiments, the viscous material is homogenized with gas and low viscosity particles and the servo motor accurately controls the amount of deposition.
Claims15
A dispensing pump for viscous materials comprising;
- a housing having a bore therethrough, said bore having first and second ends;
- a dispensing tube extending from the second end of said bore;
- a tubular sleeve in said bore;
- supply means for introducing a continuous supply of the viscous material into said tubular sleeve;
- a rotatable feed screw in said tubular sleeve and coaxial therewith, said feed screw having threads that entrap said viscous material in a relatively large volume bounded by said threads and the wall of said sleeve and which, upon rotation of said screw, force said material toward said dispensing tube while compressing and reducing the volume of the material between said threads and the wall of said sleeve;
- and
- rotating means at the first end of said bore for rotating said rotatable feed screw a predetermined amount.
A viscous fluid dispensing pump comprising:
- a body having a bore therethrough, said body bore having first and second ends and a shoulder between said first and second ends;
- a sleeve in said body bore, said sleeve abutted against said shoulder;
- a dispensing tube in the second end of said body bore and held against said tube, said dispensing tube being open to said sleeve;
- means for admitting a flow of viscous material through a wall of said sleeve and into a sleeve bore that is coaxial with said body bore;
- a servo motor at said first end of said body bore, said servo motor having a rotatable shaft coaxial with said body bore;
- a rotatable feed screw attached to said rotatable shaft, the threads of said feed screw cooperating with the wall of said sleeve bore for compressing and reducing the volume of the viscous material as said feed screw forces said material through said sleeve.
Dependencies are inferred from the claim text.