James A Dawson

US Patent:

40380157, Jul 26, 1977

Filed:

Jan 9, 1976

Appl. No.:

5/647741

Inventors:

James Earl Dawson - Lebanon OH

Assignee:

Cincinnati Milacron, Inc. - Cincinnati OH

International Classification:

B29F 100

US Classification:

4254517

Abstract:

An injection molding machine has an improved lock and block system wherein the lock recess on the ram is defined between the parallel faces of a pair of spaced apart rings. The lock recess is established at a preselected position by sliding various ones of the rings longitudinally forward or rearward on the compression ram to coincide with a preselected advance position of the compression ram (blocking ram) on which is mounted the movable platen. The rings may be spaced apart by a magnetic spacer which is positioned where it will not be struck by moving parts of the machine. At least one jackhole or toolhole is provided in the side of the ring so that it can be separated from adjacent machine elements during set up operations.

US Patent:

41402383, Feb 20, 1979

Filed:

Nov 11, 1977

Appl. No.:

5/850686

Inventors:

James E. Dawson - Lebanon OH

Assignee:

Cincinnati Milacron Inc. - Cincinnati OH

International Classification:

B29F 103

US Classification:

222495

Abstract:

A nozzle shut-off valve for injection molding machine for plastic material, especially thermoplastic material, has two pneumatic cylinder-and-plunger units. One such unit has its plunger mounted to reciprocate so as to block the passageway of the plastics through the nozzle. The first such plunger and cylinder unit is provided with a pilot passage in the valve nozzle so that the pressure of molten plastic can be used to open it. The second such unit is much smaller diameter and has its plunger mounted to block the pilot passage so that the second unit in effect becomes a pilot valve and controls the application of fluid pressure through the pilot passage to the first unit plunger or blocking plunger.

US Patent:

40739449, Feb 14, 1978

Filed:

Jul 6, 1976

Appl. No.:

5/702481

Inventors:

James E. Dawson - Lebanon OH

Assignee:

Cincinnati Milacron Inc. - Cincinnati OH

International Classification:

B29F 103

US Classification:

425146

Abstract:

A nozzle shut-off valve for an injection molding machine has a plunger mounted to reciprocate in a bore so as to block the passageway of the plastic through the nozzle, a single-acting pneumatic piston and cylinder to reciprocate the plunger, to block said passageway, and a pilot passage connecting the underside of the plunger to a location upstream of the intersection of the bore and the passageway for plastic through the nozzle.

US Patent:

40999041, Jul 11, 1978

Filed:

Apr 21, 1977

Appl. No.:

5/789533

Inventors:

James Earl Dawson - Lebanon OH

Assignee:

Cincinnati Milacron Inc. - Cincinnati OH

International Classification:

B29F 103

US Classification:

425563

Abstract:

A nozzle shut-off valve for placing between the injection apparatus and the mold cavity uses two pins of different lengths for the valve elements and switches air pressure back and forth between pistons on opposite (outer) ends of the pins. The pistons have no fixed connection to the pins. Each pin is actuated either by force from the piston on its outer end or pressure by the plastic melt on its innermost other end. The longer pin has a length sufficient to extend completely across the injection passage and block it to prevent any flow. The shorter pin is deliberately made short enough that it cannot block the passage. The valve is actuated by air pressure on the two pistons in timed relation to injection molding events. Pressure on the piston engaging the longer pin compels blocking of the injection passage during plastication. Switching of pressure to the other pin during injection permits the pressure of molten plastic to spread the pins apart whereupon injection proceeds in the ususal manner.