Importance

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Abstract

A drawing device which may be vertically or horizontally disposed in operation has a single rigid formed or extruded length as a bed. To one end of the bed is affixed a manual winch using a belt for applying tension to the workpiece. The belt is affixed to the upper end of a draw block with a lower end pivoted to two inverted lateral link arms each extending outward with an incline upwards to one distal end of the two straight, non-crossing jaw arms. The tension applied to the draw block is translated by the inverted lateral link arms into force directed outward upon the distal ends of the jaw arms which closes the jaws. The mechanical leverage obtained allows a reduction in overall length and weight of the draw tongs. Between the draw block and a stop bracket to which the jaws are pivoted, a stop bolt extends with a spring about it in compression biasing the jaws shut and facilitating manual loading of the workpiece. With the draw tension directed upwards the stop bolt is disposed head down with the shaft extending through a bore trapping the head in the stop bracket and threading into the lower end of the draw block. This provides an adjustable positive stop. The draw plate or die is held by a spring clip formed from a slotted steel shim attached at one side to and spaced apart from a stanchion attached to the end of the bed distal the winch.

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First Claim