Static molds – Providing substitution of alternatively used parts
Patent
1987-08-14
1988-12-06
Woo, Jay H.
Static molds
Providing substitution of alternatively used parts
249141, 249155, 249161, 425388, B29C 5130
Patent
active
047891297
ABSTRACT:
A rapidly adjustable mold for thermoforming plastic sheet material into different-sized containers is disclosed. The mold comprises a bottom wall and four orthogonally oriented, readily moveable sidewalls, which together define a mold cavity that is rapidly adjustable to produce rectangular containers of various sizes and aspect ratios. The first sidewall extends from a bottom wall corner and alongside a first bottom wall edge; and is vertically moveable but horizontally stationary. The second sidewall extends from the same corner but alongside a second bottom wall edge perpendicular to the first; and is both vertically moveable and horizontally moveable along the second edge. The third sidewall extends perpendicularly from an end of the second sidewall and parallel with the first sidewall over the bottom wall; and is vertically stationary but horizontally moveable in directions parallel with both edges. The fourth sidewall extends perpendicularly from an end of the third sidewall and parallel with the second sidewall, over the bottom wall, and perpendicularly to the first sidewall; and is vertically stationary but horizontally moveable in directions parallel with the first edge. With suitably mechanized actuators for moving the sidewalls, mold cavity size can be changed rapidly, between associated machine indexes if desired, to quickly accommodate a required change in container dimensions. Exemplary container manufacturing processes using such a mold also are disclosed.
REFERENCES:
patent: 1591558 (1926-07-01), Pike
patent: 2133675 (1938-10-01), Ten Bosch
patent: 3002250 (1961-10-01), Huet
patent: 3635642 (1972-01-01), Mueller
patent: 4156516 (1979-05-01), Oliver
patent: 4637789 (1987-01-01), Netznik
Dixon William C.
Eastman Kodak Company
Housel James C.
Woo Jay H.
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