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US 4,283,062 AGranted
Hydraulic injection molding machine stuffing box
AssigneeCincinnati Milacron Inc.
InventorsJames R. Catanzaro, August R. Meyer, David L. Willis
Life of this patent
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AssigneeCincinnati Milacron Inc.
InventorsJames R. Catanzaro, August R. Meyer, David L. Willis
Estimating the term…
A stuffing box as applied to the sliding joint between the piston (ram) and cylinder of a hydraulic ram assembly in a hydraulic injection molding machine has a packing retainer assembly with a retainer ring with a protruding gland that extends into the stuffing box thereby to act as a pilot means to insure concentricity between the stuffing box, gland, and ram. In addition, the inside diameter of the gland has a support bushing groove in which is mounted a support bushing that has an inside diameter less than the inside diameter of the gland and which is fitted in sliding bearing relationship to the outside diameter of the ram and held there by the gland. The support bushing is preferably manufactured in two pieces from a fiber reinforced low friction resin selected from the class consisting of thermosetting resin and thermoplastic resin more preferably phenol formaldehyde and polytetrafluoroethylene.
In a ram support packing retainer assembly for use in the stuffing box disposed at the sliding joint between the piston and the cylinder of a hydraulic ram in a hydraulic press such as a hydraulic injection molding machine for molding articles from resin and wherein said stuffing box has packing disposed within an annular outer recess at the end of the cylinder in engagement with the piston and of the kind which expands radially inward against the piston in response to axial compression by a gland or packing retainer ring, the improvement comprising:
In combination with a hydraulic injection molding machine for molding articles from synthetic resin, a stuffing box assembly at the hydraulic ram to enhance the sealing and wiping of the sliding joint between the piston ram and cylinder there, said stuffing box having packing disposed within an annular outer recess at the end of the cylinder in engagement with the piston and of the kind which expands radially inward against the piston in response to axial compression by a gland or packing retainer ring the improvement comprising:
Dependencies are inferred from the claim text.