Electrically Operated Pressing Tool
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United States of America Patent
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Issued Date -
Nov 29, 2007
app pub date -
Oct 12, 2004
filing date -
Dec 4, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
For handling reasons, this invention makes it possible to construct electrically operated pressing tools as compact as possible. The pressing tool includes a hydraulic pump that acts upon a piston-cylinder unit by which locking pliers can be actuated by a roll holder with rolls. During actuation, hydraulic oil is conveyed out of an elastic hydraulic oil reservoir and into the cylinder chamber and, from there, flows back again after a pressure build-up. To save space, according to this invention the hydraulic oil reservoir is formed as a sleeve that sealingly acts as a cylinder housing of the piston-cylinder unit. An actuating valve in the piston-cylinder unit can be actuated while passing through the sleeve.
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