Metal working machine

A metal working machine comprising, in combination:

• a first crank arm pivotably mounted about a first pivot axis;
• a second crank arm pivotably mounted about a second pivot axis spaced from and parallel to the first pivot axis;
• a link having a first end pivotably mounted to the first crank arm about a third pivot axis parallel to and spaced from the first and second pivot axes and having a second end pivotably mounted to the second crank arm about a fourth pivot axis parallel to and spaced from the first, second, and third pivot axes;
• means for simultaneously pivoting the first and second crank arms about the first and second pivot axes in opposite directions;
• and at least one working station associated with one of the first and second crank arms;
• wherein the simultaneously pivoting means comprises an expandable and contractable actuator having a first end pivotably mounted to the first crank arm about a fifth pivot axis parallel to and spaced from the first, second, third and fourth pivot axes and a second end pivotably mounted to the second crank arm about a sixth pivot axis parallel to and spaced from the first, second, third, fourth and fifth pivot axes.

A metal working machine comprising, in combination:

• a first crank arm pivotably mounted about a first pivot axis;
• a second crank arm pivotably mounted about a second pivot axis spaced from and parallel to the first pivot axis;
• a link having a first end pivotably mounted to the first crank arm about a third pivot axis parallel to and spaced from the first and second pivot axes and having a second end pivotably mounted to the second crank arm about a fourth pivot axis parallel to and spaced from the first, second, and third pivot axes;
• means for simultaneously pivoting the first and second crank arms about the first and second pivot axes in opposite directions;
• and at least one working station associated with one of the first and second crank arms;
• wherein the third pivot axis is spaced vertically and horizontally between the first and second pivot axes and wherein the second pivot axis is located horizontally between the third and fourth pivot axes.

A metal working machine comprising, in combination:

• a first crank arm pivotably mounted about a first pivot axis;
• a second crank arm pivotably mounted about a second pivot axis spaced from and parallel to the first pivot axis;
• a link having a first end pivotably mounted to the first crank arm about a third pivot axis parallel to and spaced from the first and second pivot axes and having a second end pivotably mounted to the second crank arm about a fourth pivot axis parallel to and spaced from the first, second, and third pivot axes;
• means for simultaneously pivoting the first and second crank arms about the first and second pivot axes in opposite directions;
• and at least one working station associated with one of the first and second crank arms;
• wherein the second pivot axis is located horizontally between the third and fourth pivot axes.

A metal working machine comprising, in combination:

• a first crank arm pivotably mounted about a first pivot axis;
• a second crank arm pivotably mounted about a second pivot axis spaced from and parallel to the first pivot axis;
• a link having a first end pivotably mounted to the first crank arm about a third pivot axis parallel to and spaced from the first and second pivot axes and having a second end pivotably mounted to the second crank arm about a fourth pivot axis parallel to and spaced from the first, second, and third pivot axes;
• means for simultaneously pivoting the first and second crank arms about the first and second pivot axes in opposite directions;
• and at least one working station associated with one of the first and second crank arms;
• wherein the second crank arm includes a first shearing edge pivotally movable relative to a second, stationary shearing edge about the second pivot axis in a pivot plane between a first, open position with the first and second shearing edges extending at an open angle from each other and a second, shearing position with the first and second shearing edges at least abutting each other;
• wherein the metal working machine further comprises, in combination:
• a wing integrally formed with the second crank arm spaced from the second pivot axis and extending in the plane of the second crank arm beyond the first shearing edge and extending beyond the second shearing edge;
• and means for slideably sandwiching the wing in the pivot plane for preventing movement of the second crank arm out of the pivot plane.

In a shearing device including a first elongated blade having a shearing edge and a second elongated blade having a shearing edge, with the first elongated blade being pivotably mounted to the second elongated blade about a pivot axis and pivotable about the pivot axis in a pivot plane in a shearing direction between a first, open position with the shearing edges of the first and second blades extending at an open angle from each other and a second, shearing position with the shearing edges of the first and second blades at least abutting each other, the improvement comprising means for preventing movement of the first elongated blade out of the pivot plane comprising, in combination:

• a wing integrally formed with the first blade spaced from the pivot axis and extending in the shearing direction in the plane of the first blade beyond the shearing edge of the first blade and extending beyond the shearing edge of the second blade in the first and second positions;
• means for slideably sandwiching the wing against the second blade in the pivot plane;
• an arcuate ear integrally formed with the first blade extending concentrically around the pivot axis in the plane of the first blade beyond the shearing edge of the first blade and extending beyond the shearing edge of the second blade;
• and means for slideably sandwiching the arcuate ear in the pivot plane.