Drive unit
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United States of America Patent
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Apr 27, 2010
Grant Date -
Nov 22, 2007
app pub date -
Jul 1, 2005
filing date -
Jul 8, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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