Mold clamping device
US4861259A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1988 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Feb 26, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/6771
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A mold clamping device is disclosed. The device includes a clamping ram, whose front end is connected to a moveable board of an injection molding machine, slidably fitted in a clamping cylinder, and a support cylinder provided in parallel to the clamping cylinder. A support piston is slidably positioned in the support cylinder, and the front end of the rod of the support piston is connected to the moveable board of the injection molding machine. A front chamber and a rear chamber of the clamping cylinder, divided by the piston section of the clamping ram, and a front chamber of the support cylinder are connected by an oil path. There is provided a valve for opening or closing the connection between the rear chamber of the clamping cylinder and the front chamber of the clamping cylinder and the front chamber of the support cylinder. The effective pressure receiving area of the rear chamber of the clamping cylinder is substantially equal to the sum of the effective pressure receiving area of the front chamber of the clamping cylinder and the front chamber of the support cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.