Mold-clamping mechanism for injection-molding machine
US4017236A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1975 |
| Grant date | Apr 12, 1977 |
| Priority date | — |
| Expiry date | Nov 26, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/221
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A clamping mechanism, effective to press a movable platen against a fixed platen in a terminal phase of a mold-closing stroke of an injection-molding machine, comprises a series of coaxial annular pistons received with progressively larger clearances in respective inner peripheral grooves of a stationary housing linked by tie rods with the fixed platen. The pistons, which can be interconnected by elastic bolts, bear upon a mounting frame, slidable along the tie rods, supporting a pair of laterally withdrawable shutters which in their retracted position give passage to a tubular thrust member coaxially surrounding a plunger secured to that thrust member and to the movable platen. The opposite end of the plunger carries a piston head received, within the housing, in a central driving cylinder to which hydraulic fluid can be admitted from either end for advancing or retracting the movable platen in a mold-closing or a mold-opening stroke. In a forward position of the movable platen, the tubular thrust member just clears the shutters which are then moved toward each other into a working position behind that member whereupon fluid is admitted to the housing grooves for pressurizing the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.