Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2005-07-05
2005-07-05
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S510000, C219S109000
Reexamination Certificate
active
06914440
ABSTRACT:
A welding system having a welding gun, comprising a casing that is grounded through a ground conductor, and a monitoring device, which detects the resistance of the ground conductor. A blanking device deactivates the monitoring device during the welding operation to reduce the danger of shut-downs through the ground integrity monitor. It is proposed to either deactivate the measuring circuit of the ground integrity monitor or to switch off the welding power interruption associated therewith as long as a welding current may flow or is flowing through the ground conductor. The monitoring device is deactivated or blanked out only for an essentially negligible fraction of the entire time, and there is no danger of any impairment of safety due to this short-term deactivation.
REFERENCES:
patent: 4507699 (1985-03-01), Rohm
patent: 4963830 (1990-10-01), Roth et al.
patent: 5021625 (1991-06-01), Destefan et al.
patent: 6437951 (2002-08-01), Ahlstrom et al.
patent: 6657163 (2003-12-01), Blankenship et al.
Matuschek Ulrich
Pöll Karl
Usedom Peter
Choate Hall & Stewart LLP
Deb Anjan
Matuschek Messtechnik GmbH
Teresinski John
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