DAVID HARRIS, DPT
Physical Therapy at Molalla Ave, Redland, OR

4312397, Jan 26, 1982

Apr 14, 1980

6/140296

David L. Harris - Oregon City OR
Colin Taylor - Lake Oswego OR

Dependable-Fordath, Inc. - Sherwood OR

B22C 912

164 71

A pattern holder 12 and a sand tank 14 are rotatably mounted on a frame 16 so that the pattern holder can be inverted over and sealably mounted atop the sand tank. A vented pattern 26 is secured to the pattern holder and forms a first chamber between one side of the pattern and the interior of the pattern holder. A second chamber 90 is formed between the other side of the pattern and the interior of the sand tank when the pattern holder adjoins the sand tank. O-ring seals 32 and 80 isolate the chambers from the atmosphere so that a partial vacuum can be formed therein. A mixture 84 of sand and a gas-curable binder is provided in the sand tank so that the mixture will fall onto the pattern upon inverting the sand tank over the pattern holder. A flexible line 42 is provided for controllably introducing a gas catalyst into the chamber 38 in order to cure a portion of the sand-binder mixture to form a shell mold 94 of a predetermined thickness on a pattern face 36 of the pattern. Flexible lines 41 and 43 are provided for evacuating and purging the chamber 38 at different stages in the process.

4037826, Jul 26, 1977

Apr 26, 1976

5/679915

Gary L. Hulslander - Portland OR
Gary E. Mills - Portland OR
David L. Harris - Oregon City OR

Dependable-Fordath, Inc. - Sherwood OR

B01F 716

259 8

A mixing apparatus for mixing particulate material is described in which a plurality of different shaped blades are employed for thorough rapid mixing as the material moves downward through a mixing chamber and for impelling the mixed material downward through a discharge opening at the bottom of such chamber. A pair of convoluted lower mixing blades, which spiral downward and inward, are used to mix, to impel the material downward through the discharge opening, and to scrape such material from the conical bottom surface of the mixing chamber. First and second pairs of longitudinal intermediate mixing blades of different lengths positioned above the convoluted blades mix and scrape the material from the cylindrical side surface of the mixing chamber. A plurality of upper deflector blades are attached to the periphery of an upper baffle plate to deflect the material downward after it is thrown outward from the rotating baffle plate when the material is fed onto such baffle plate through the inlet openings of the mixing apparatus. A pair of separate screw conveyor feeding means are employed to transmit two different materials separately into the mixing chamber.

4560281, Dec 24, 1985

Apr 16, 1984

6/600425

David L. Harris - Oregon City OR
Colin Taylor - Lake Oswego OR

Foundry Automation, Inc. - Clackamas OR

B28C 116, B28C 514

366 15

Foundry apparatus for mixing sand with binder ingredients to produce a composite mixture suitable for foundry molds includes a first premixing chamber enclosing a first bladed shaft mounted for rotation about a substantially horizontal first axis operable for conveying and commingling sand with a first binder ingredient to produce a first sand/binder ingredient mixture. A second premixing chamber, separate from the first premixing chamber, encloses a second bladed shaft mounted for counterrotation about a second axis, substantially parallel to the first axis, for conveying and commingling sand with a second binder ingredient to produce a second sand/binder ingredient mixture. A final mixing chamber includes agitators for receiving the sand/binder ingredient mixtures and blending them into a composite mixture while simultaneously transporting the composite mixture to a final discharge station. A single power-driven unit operates for driving the first and second bladed shafts, which in turn, operate the first and second agitators.