Hydraulic drive mechanism for a joining tool
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United States of America Patent
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-
Jun 4, 2002
Grant Date -
N/A
app pub date -
May 26, 2000
filing date -
May 27, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hydraulic drive mechanism to actuate a tool for joining at least two work-pieces of ductile material such as by self-piercing riveting or clinching. The drive mechanism comprises a punch drive for actuating a punch and a clamp drive for actuating a clamp which clamps the workpieces against an up-setting die during the joining operation. Both drives comprise piston cylinder assemblies. The piston cylinder assembly of the clamp drive is carried by the piston rod of the punch drive. The pressure chamber of the clamp drive communicates with one of the work chambers of the punch drive such that pressure within the work chamber of the punch drive is transmitted to the pressure chamber of the clamp drive in order to generate the clamping force. As a result thereof only a pair of fluid connections are required for operating both drives.
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