L. Schuler Gmbh

Walter Panknin

Franz Schneider

Kurt Finsterwalder

Fred E Schalch

Rolf Ruhl

Zelimir Belamaric

Hans Bassler

Reinhard Kannegiesser

Gerhard Nockher

Device for electric longitudinal-seam mash resistance welding

In conventional methods for welding can bodies along their longitudinal seams, high frequency substantially rectangular a.c. currents are used for the welding current to avoid the problem of arcing found in d.c. welders. However, the high frequency a.c. current causes an undesirable degree of heating which produces eddy currents and necessitates cooling equipment. To overcome this problem, a method of producing can bodies welded along their longitudinal seam is provided in which the length of a half wave of the substantially rectangular welding current is matched in length and concurrent with the amount of time required for a can body to pass between the welding electrodes.

Method of and apparatus for producing can bodies welded along the

A device for producing a bead on a circumference of a hollow cylinder seeks to minimize the risk of unwanted deformations of the hollow cylinder such as wrinkles or bulges which can result when an area of the hollow cylinder to be beaded is forced inward without support. In a preferred embodiment, the device of producing a bead on a hollow cylinder includes an internal tool and an external tool which can be adjusted in a controlled manner in the radial direction, the internal tool comprising a support mandrel and an inner ring which is adjacent to the supporting mandrel in the axial direction and is capable of being adjusted radially relative thereto, and the external tool includes an outer ring which surrounds the inner ring and a hold-down ring which is axially adjacent the outer ring and capable of being adjusted radially relative thereto. A preferred arrangement utilizes axially oriented springs whose forces are deflected radially inwards by tapered ring surfaces and assure proper relative movements of the several radially shiftable parts.

Device for producing a bead on the circumference of a hollow cylinder

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Goppingen, Germany

Walter Panknin