Drive unit
US7704068B2 · kind B2 · utility
1Cited by
4References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 1, 2005 |
| Grant date | Apr 27, 2010 |
| Priority date | — |
| Expiry date | Aug 9, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/685
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is a drive unit, in particular for a closing unit, an injection unit, or an ejector of an injection molding machine. The drive unit comprises a double-acting force transmitting element provided with a small and a large piston unit which are disposed in a cylinder. The large piston unit is adapted to be pressurized by a great force both in input and in output directions. According to the invention, both the large piston unit with respect to the cylinder and the cylinder with respect to a movable element of the drive of the small piston unit are spring-prestressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.