Clamping device for injection-molding machine

Details Clamping device for injection-molding machine Clamping device for injection-molding machine

2005-05-17

2005-05-17

Mackey, James P. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With means to retard or stop moving element

C425S590000, C425S595000, C425S451700

Reexamination Certificate

active

06893246

ABSTRACT:
A clamping device for injection-molding machine includes a high-speed screw rod unit having a nut element screwed thereto and a movable mold holder connected to a front end thereof, a clamping screw rod unit screwed to a rear end of the nut element and connected to a transmission assembly, a pre-pressing unit adjustably tightened to the clamping screw rod unit for the latter to generate a pre-pressure against the nut element, and a braking unit adapted to brake the nut element. When the nut element is not braked, the high-speed screw rod unit is driven by the transmission assembly to move forward at high speed for closing mold. And, when the nut element is braked and the clamping screw rod unit is driven by the transmission assembly to rotate relative to the nut element, the nut element is linearly pushed forward to generate a high-pressure clamping force during closing mold.

REFERENCES:
patent: 2484344 (1949-10-01), Hiller et al.
patent: 3704973 (1972-12-01), Renfrew et al.
patent: 6254371 (2001-07-01), McNally et al.

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