B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/705
B29C 45/67 (2006.01)
Patent
CA 2006838
ABSTRACT CLAMPING UNIT FOR INJECTION MOLDING MACHINE The clamping unit comprises hydrau- lic actuating means including at least two locking cy- linders provided with respective locking pistons, which are connected by piston rods to a movable mold carrier. Each locking cylinder contains a high-pressure chamber and a low-pressure chamber, which are adapted to commu- nicate with each other through overflow passages formed in the associated locking piston. The overflow passages can be shut off by valve members. The hydraulic actuat- ing means have an axis of symmetry, on which a drive cylinder and a buffer cylinder are centered. The drive cylinder serves to close and open the injection mold. The buffer cylinder is connected to the movable mold carrier and has a buffer chamber, which communicates with the low-pressure chambers of the locking cylinders. In all The locking cylinders and the buffer cylinder comprise steel tubes, which are connected at both ends to common cylinder covers to constitute a unit. The drive cylinder is coaxially surrounded by the steel tube of the buffer cylinder. The steel tubes of at least two locking cylinders are symmetrical to the drive cy- linder. Owing to that design the hydraulic actuat- ing means are compact and can be manufactured at low cost.
Hehl Karl
Macrae & Co.
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