Closure device for an injection molding machine or injection press
US4111629A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 11, 1977 |
| Grant date | Sep 5, 1978 |
| Priority date | — |
| Expiry date | Apr 11, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/6771
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Closing unit for an injection moulding machine or transfer moulding press with a frame, a first tool carrier rigidly connected therewith, a second displaceable tool carrier and hydraulic displacing devices, which are eccentrically arranged with respect to the tool carriers and of which each has a hollow cylinder fastened to the frame and a piston which is displaceably guided therein and of which each is provided on one side with a first shaft and on the other side with a second shaft. The first shafts are arranged such that they are drawn into the hollow cylinders when the tool carriers are brought nearer to each other, and wherein one each of the two shafts of the pistons is connected rigid with the second tool carrier. According to the invention, at least two pistons are provided, the first shaft of which has a smaller diameter than its second shaft, and there are also provided at least two pistons, the first shaft of which displays a greater diameter than its second shaft. An annular gap is formed between the inside surfaces of the hollow cylinders and the piston, and a valve closing ring, which forms a tight seat with the inside surface of the hollow cylinder as well as also wi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.