Staggered cylinders in a valve gate apparatus

Details Staggered cylinders in a valve gate apparatus Staggered cylinders in a valve gate apparatus

2007-09-24

2010-11-23

Lee, Kevin L (Department: 3753)

Fluid handling

Systems

Valves with separate, correlated, actuators

C137S637200, C251S324000, C251S063000, C251S063500

Reexamination Certificate

active

07836915

ABSTRACT:
A valve gate piston assembly, in an injection molding system, is positioned in a staggered arrangement such that one piston assembly overlaps that of another valve gate piston assembly thereby minimizing an overall centerline pitch between said piston assemblies. Such a superposed layout of piston assemblies enables larger diameter pistons to occupy a smaller footprint than would be realized should the same piston assemblies be positioned side by side. The use of relatively larger diameter pistons results in an increased force available, for the same input air pressure, to actuate the pistons and valve stems attached thereto, resulting in a higher valve stem closing force. A staggered piston assembly layout also allows independent air circuits to control each piston separately. A combination of multiple piston assemblies may be configured in such a staggered, overlapping array.

REFERENCES:
patent: 2224290 (1940-12-01), Corbin, Jr.
patent: 2729241 (1956-01-01), Clark
patent: 2784738 (1957-03-01), Thurber, Jr.
patent: 4682756 (1987-07-01), Hartwig et al.
patent: 2004/0091566 (2004-05-01), Olaru

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