Method of opening and closing molds of injection molding machine

Details Method of opening and closing molds of injection molding machine Method of opening and closing molds of injection molding machine

1994-02-28

1995-06-06

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

425590, 4254512, B29C 4567

Patent

active

054220602

ABSTRACT:
A mold clamping apparatus for injection molding machines includes a stationary plate 2 for supporting a stationary mold Cc; a moving plate 6 for supporting a moving mold Cm; a plurality of parallel tie bars 3a, 3b, 3c, and 3d of which end portions are secured to the stationary plate 2; a plurality of different cylinders 4a-4d . . . which accommodate piston sections 5a, 5b, 5c, and 5d set at the middle of each tie bar, and arranged movably along the tie bars and integrally with the movable plate; and a hydraulic circuit 7 capable of selective feeding of pressurized oil to the oil chambers of the cylinders. The piston sections of different cylinders are formed in different diameters and all portions of all tie bars are formed in the same diameter.

REFERENCES:
patent: 3426657 (1969-02-01), Bimba
patent: 3807285 (1974-04-01), Phillips
patent: 3935791 (1976-02-01), Hehl
patent: 4021181 (1977-05-01), Hehl
patent: 4069747 (1978-01-01), Forry et al.
patent: 4111629 (1978-09-01), Nussbaumer
patent: 4128380 (1978-12-01), Jamann
patent: 4815360 (1989-03-01), Winterle
patent: 5051087 (1991-09-01), Huang

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