Thomas E Bishop

US Patent:

39457869, Mar 23, 1976

Filed:

Jul 25, 1973

Appl. No.:

5/382500

Inventors:

Thomas G. Bishop - Mount Gilead OH

Assignee:

Koehring Company - Milwaukee WI

International Classification:

B29F 104

US Classification:

425208

Abstract:

A molding system for producing articles of mottled appearance includes a plasticizing unit having an inner bore which communicates with a mold cavity. A feed screw is mounted within the bore and is connected to fluid-actuated motors for rotary and translational movement within the bore. A spreader device is positioned in a heated part of the bore ahead of the feed screw. The screw is rotated to feed and soften molding materials of diverse coloration and is subsequently translated to push the materials through the spreader device such that final plasticization occurs. A bridging conduit is provided between the rotary and translational motors to divert a controlled amount of fluid from the latter to the former during a pushing operation, to rotate the screw forwardly at a controlled rate or to hold pressure on the screw to prevent backward rotation or to limit the amount of backward rotation.

US Patent:

43878342, Jun 14, 1983

Filed:

Oct 20, 1980

Appl. No.:

6/199077

Inventors:

Thomas G. Bishop - Mount Gilead OH

Assignee:

HPM Corporation - Mount Gilead OH

International Classification:

G01F 1100

US Classification:

222278

Abstract:

An injection molding machine which is capable of injecting both thermoplastic compounds and glass loaded thermosetting polyester compounds, wherein the machine is capable of rapid conversion from its thermoplastic configuration to its thermosetting configuration, and vice versa. The machine comprises an elongated charge forming barrel having a rearward thermoplastic feed opening, which is customarily supplied by pelletized thermoplastic material from a vertical feed hopper, and a thermosetting material feed opening extending into the barrel at a position forwardly of the thermoplastics feed opening. When processing thermoplastics materials, a conventional, fully flighted plasticizing screw is installed in the barrel so that the pelletized material is conveyed forwardly from the rear feed opening, and plasticized for subsequent injection. During thermoplastics processing, the thermosetting feed opening is plugged. To convert the machine to process the aforementioned thermosetting materials, the second feed opening is unplugged, and the plasticizing screw is exchanged for a deeper flighted conveying screw having flights extending from the forward end thereof to just behind the unplugged, second opening.

US Patent:

40426602, Aug 16, 1977

Filed:

Jan 14, 1976

Appl. No.:

5/649063

Inventors:

Thomas G. Bishop - Mount Gilead OH

Assignee:

HPM Corporation - Mount Gilead OH

International Classification:

B29F 112

US Classification:

264 77

Abstract:

A molding system for producing articles of mottled appearance includes a plasticizing unit having an inner bore which communicates with a mold cavity. A feed screw is mounted within the bore and is connected to fluid-actuated motors for rotary and translational movement within the bore. A spreader device is positioned in a heated part of the bore ahead of the feed screw. The screw is rotated to feed and soften molding materials of diverse coloration and is subsequently translated to push the materials through the spreader device such that final plasticization occurs. A bridging conduit is provided between the rotary and translational motors to divert a controlled amount of fluid from the latter to the former during a pushing operation, to rotate the screw forwardly at a controlled rate or to hold pressure on the screw to prevent backward rotation or to limit the amount of backward rotation.

US Patent:

39499731, Apr 13, 1976

Filed:

Jul 5, 1974

Appl. No.:

5/485949

Inventors:

Thomas G. Bishop - Mount Gilead OH
William T. Flickinger - Marion OH

Assignee:

Koehring Company - Milwaukee WI

International Classification:

B29B 110

US Classification:

259191

Abstract:

A screw for injection molding of synthetic resinous material having a tendency to abrade and score the injection molding apparatus is provided along a substantial length of the feed section with a substantially undercut screw flight. An average particle of synthetic resinous feed stock material may pass between the undercut screw flights and a cooperating barrel without squashing. The undercut screw flights are effective to provide a controlled feed pressure for the particulate material entering the downstream portion of the screw.

US Patent:

40059642, Feb 1, 1977

Filed:

Feb 10, 1975

Appl. No.:

5/548768

Inventors:

Thomas G. Bishop - Mount Gilead OH

Assignee:

Koehring Company - Milwaukee WI

International Classification:

B29F 1022

US Classification:

425242R

Abstract:

An injection mold includes a stationary platen carrying a pair of stationary die sections, a movable platen carrying a pair of movable die sections, and a pair of floating die sections disposed between the movable and stationary die sections. The respective floating and stationary die sections are mutually configured to define a pair of die cavities which are arranged for alternate communication with an injector unit. The floating die sections are selectively connectable to their associated movable and stationary die sections to expose one of the die cavities for article ejection, while maintaining the other die cavity closed for continuing a curing stage.

US Patent:

42809720, Jul 28, 1981

Filed:

Oct 1, 1979

Appl. No.:

6/080486

Inventors:

Thomas G. Bishop - Mount Gilead OH

Assignee:

HPM Corporation - Mount Gilead OH

International Classification:

B29F 102
B29G 300

US Classification:

264 39

Abstract:

An injection molding machine which is capable of injecting both thermoplastic compounds and glass loaded thermosetting polyester compounds, wherein the machine is capable of rapid conversion from its thermoplastic configuration to its thermosetting configuration, and vice versa. The machine comprises an elongated charge forming barrel having a rearward thermoplastic feed opening, which is customarily supplied by pelletized thermoplastic material from a vertical feed hopper, and a thermosetting material feed opening extending into the barrel at a position forwardly of the thermoplastics feed opening. When processing thermoplastics materials, a conventional, fully flighted plasticizing screw is installed in the barrel so that the pelletized material is conveyed forwardly from the rear feed opening, and plasticized for subsequent injection. During thermoplastics processing, the thermosetting feed opening is plugged. To convert the machine to process the aforementioned thermosetting materials, the second feed opening is unplugged, and the plasticizing screw is exchanged for a deeper flighted conveying screw having flights extending from the forward end thereof to just behind the unplugged, second opening.