Importance

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Abstract

An arc welder has a locking crank mechanism for adjusting and securing the adjustment of a transformer having a moveable transformer core shunt. The arc welder has an adjustment base, with a plurality of locking detents in a substantially circular planar ring configuration. The position of the base is fixed in relation to the position of the transformer. The arc welder also has a substantially circular crank plate with a lever opening, with the crank plate mounted for rotation adjacent to and concentric with the locking detents. A mechanical link operably connects the crank plate and the moveable core shunt for adjusting the position of the moveable core shunt through rotation of the crank plate. A lever is mounted to pass through the lever opening in the crank plate. The lever is mounted to pivot between (i) an adjustment position in which motion of the lever to rotate the crank plate causes motion of the mechanical link and adjustment of the position of the moveable core shunt, and (ii) a locking position in which the lever engages at least one of the locking detents in the base and prevents motion of the crank plate and mechanical link.

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First Claim