Patent ID: 8151703

Claim:
An electrically operated press tool apparatus ( 1 ) with a hydraulic pump assembly ( 320 ) driven by a drive unit ( 2 ) and which acts on a hydraulic piston cylinder unit ( 5 ) actively connected to a roller holder ( 62 ), with rollers ( 66 ) that roll on clamping jaws ( 11 ) of a clamping pincer ( 10 ) and move these relative to one another, and the press tool apparatus ( 1 ), apart from a pump receiver housing ( 30 ) with a housing wall ( 300 ) and a housing cover ( 301 ), comprises an actuation valve ( 50 ) for opening a passage between the pump receiver housing ( 30 ) and the piston-cylinder unit ( 5 ), the electrically operated tool apparatus comprising: the pump receiver housing ( 30 ) having no conduits, and a pump flange ( 326 ) with an outlet valve ( 323 ) of the hydraulic pump assembly ( 320 ) fixed in a pressing manner directly onto a connection cylinder ( 55 ) of the piston cylinder unit ( 5 ) so only pressure oscillations with a low fluid pressure occur within the pump receiver housing ( 30 ).