David C Oas

US Patent:

6461547, Oct 8, 2002

Filed:

Sep 7, 2000

Appl. No.:

09/656853

Inventors:

David C. Oas - Vandalia OH

Assignee:

7345 Corp. - Sylvania OH

International Classification:

B29C 4912

US Classification:

264 28, 264528

Abstract:

A method of stretch blow molding a plastic parison mounted to a parison engagement assembly into a container including stretching the parison by sliding the stretching rod therethrough and into the parison, connecting the cooling fluid inlet port to the source of cooling fluid to introduce the cooling fluid within the container through the cooling fluid outlet port, and heating the blow mold rod seal assembly to maintain at least a portion of the stretching rod above the preselected level, and to maintain portions of seals above the predetermined level.

US Patent:

58537759, Dec 29, 1998

Filed:

Dec 5, 1997

Appl. No.:

8/986256

Inventors:

David C. Oas - Vandalia OH
Carl L. Knepper - Troy OH
David P. Meiring - Troy OH
Timothy L. Bright - Greenville OH

Assignee:

Electra Form, Inc. - Vandalia OH

International Classification:

B29C 4968

US Classification:

425145

Abstract:

Method and apparatus for forming stretch blow molded containers having uniform sidewall thickness from physical symmetric parisons. Parisons are heated non-uniformly by rotating at a non-uniform rate in a heating station. A sensor determines the angular orientation of the parisons emerging from the heating station. Each parison is angularly reoriented at a repositioning station prior to introduction into a stretch blow molding station having non-round interior surfaces, so that the temperature profile of each parison corresponds with differential expansion required to form the desired non-round container.

US Patent:

59103264, Jun 8, 1999

Filed:

Sep 16, 1997

Appl. No.:

8/931166

Inventors:

David C. Oas - Vandalia OH
Jeffrey L. Patrick - Huber Heights OH

Assignee:

Electra Form, Inc. - Vandalia OH

International Classification:

B29C 3108
B29C 4964

US Classification:

425526

Abstract:

A blow molding apparatus configured to receive plastic parisons and output blow molded containers including a support frame and a parison conveyor attached to the support frame and having a plurality of parison supports and a drive mechanism for driving the parison supports in a stepped movement circuit, advancing the parison supports by a curvilinear distance corresponding to a curvilinear spacing between a preselected number of parison supports. A first parison transfer assembly is adapted to receive the preselected number of the parisons from the parison supports. A second parison transfer assembly is adapted to receive the preselected number of the parisons from the first parison transfer assembly for transfer to a predetermined number blow mold stations during each stepped movement, and includes the predetermined number of second conveyors having a plurality of second parison supports and adapted for a second stepped movement to advance by a second curvilinear distance corresponding to a second curvilinear spacing between a chosen number of the second parison supports, the chosen number equal to the quotient of the preselected number and the predetermined number. An element for heating the parisons, a parison unloader for disgorging the blow molded containers, and a parison unloader are provided. A method of loading a preselected number of parisons onto a parison conveyor driven in a stepped movement, and transferring the preselected number of parisons to a predetermined number of blow mold stations using first and second parison transfer assemblies.

US Patent:

56436190, Jul 1, 1997

Filed:

Dec 18, 1995

Appl. No.:

8/574201

Inventors:

David C. Oas - Vandalia OH
Lynn R. Maggert - Tipp City OH
James C. Turner - Cincinnati OH

Assignee:

Electra Form, Inc. - Vandalia OH

International Classification:

B29C 4942

US Classification:

425534

Abstract:

An article repositioning apparatus for an injection stretch blow molding machine is disclosed for simultaneously molding a plurality of containers from plastic parisons. Between work stations, the apparatus repositions articles from a compact, evenly spaced first position to an extended, unevenly paired second position. After insertion of the articles into receivers slidably mounted on tracks, the receivers are moved by a servo motor to various separations by sliding movement along the tracks, the receivers attached to aligning ribs threadably engaged with ball screws. Simultaneously, the tracks are moved by a second servo motor to uneven paired separations by attachment to movable scissors having large and small scissor portions.

US Patent:

51122138, May 12, 1992

Filed:

Feb 26, 1991

Appl. No.:

7/660513

Inventors:

David C. Oas - Westlake OH

Assignee:

Van Dorn Company - Cleveland OH

International Classification:

B29C 4552

US Classification:

425562

Abstract:

A non-return valve for an injection molding machine is provided which includes a conventional tip member threaded into the end of a plasticating screw and carrying therewith an annular valve seat member. An annular check ring receives the tip member. Tang protuberances axially extend from the check ring to rotably engage the retainer end of the tip member. This causes the check ring to couple with the tip member during screw rotation to minimize valve wear while permitting the check ring to axially move relative to the tip member for effecting valve closure by pressure differentials in the normal manner. A ramp surface is provided on the tang protuberances which engages a drive surface on the retainer end of the tip/stud member upon reverse rotation of the screw through a predetermined rotational angle or for a set time to positively close the valve prior to injection.

US Patent:

61684147, Jan 2, 2001

Filed:

Oct 31, 1997

Appl. No.:

8/961931

Inventors:

David C. Oas - Vandalia OH

Assignee:

Electra Form, Inc. - Vandalia OH

International Classification:

B29C 4912
B29C 4966

US Classification:

425526

Abstract:

A cryogenic stretch blow molding apparatus including a stretching rod mounted to a blow mold rod seal assembly for sliding movement therethrough, into and longitudinally stretching a plastic parison, the stretching rod including a cooling fluid tube defining a cooling fluid inlet port for connection to a source of a cooling fluid and a cooling fluid outlet port to introduce the cooling fluid within the container, and a heater disposed in a cavity defined in the blow mold rod seal assembly for heating the blow mold rod seal assembly so that at least a portion of the stretching rod is maintained at a temperature above a preselected level to prevent accumulation thereon of ice sublimated from water vapor present in the blow air and portions of seals of the blow mold rod seal assembly are maintained at a temperature above a predetermined level to prevent seal failure. A method of stretch blow molding a plastic parison mounted to a parison engagement assembly into a container including stretching the parison by sliding the stretching rod therethrough and into the parison, connecting the cooling fluid inlet port to the source of cooling fluid to introduce the cooling fluid within the container through the cooling fluid outlet port, and heating the blow mold rod seal assembly to maintain at least a portion of the stretching rod above the preselected level, and to maintain portions of seals above the predetermined level.