Electro-hydraulic pressing device
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United States of America Patent
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Dec 22, 2015
Grant Date -
Jan 1, 2015
app pub date -
Oct 24, 2012
filing date -
Dec 17, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
An electro-hydraulic pressing device, which is particularly suitable for producing pipe joints by means of press fittings, has a pressure piston, which acts on pressing jaws. The pressure piston divides a pressure piston chamber into a pressure chamber and a rear chamber. A hydraulic pump for feeding hydraulic fluid from a reservoir is connected to the pressure chamber. A balance piston is arranged in the piston in addition to an overpressure valve. Up until a switch-off pressure is reached, i.e. throughout the pressing process, the balance piston closes a connection opening and a return flow channel.
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