Metal deforming – Tool and/or tool holder – Having unitary tool-face
Patent
1999-06-29
2000-10-17
Jones, David
Metal deforming
Tool and/or tool holder
Having unitary tool-face
723792, 72479, 7245315, 292435, B21D 3106
Patent
active
06131434&
ABSTRACT:
A tool for folding sheet metal edges includes the following. A pneumatic hammer has a stepped barrel with an externally cylindrical proximal portion and a reduced-down distal portion externally formed with inverse spring thread. A plunger has a shank with a work-striking head, a spaced away butt end that loads into the hammer barrel, and an intermediate axial-stop enlargement disposed therebetween. A spring for retention of the plunger and has a main body formed on a major diameter, a shank-latching portion formed on a minor diameter, and a transition section therebetween. The main body has a series of closed regular coils which partly thread onto the inverse spring thread of hammer barrel and in other part which, with inclusion of the transition section, generally project so that the shank-latching portion latches across the shank of the plunger just forward of the axial stop. That way, axial extensions of the spring normally retract the plunger back into the hammer barrel. A rigid guide has a base end with a clamping mechanism for clamping onto the hammer barrel's proximal portion. At the other end, it has a guide lip which, while the guide is attached to the hammer, projects past and below the striking head of the plunger. It also has an intermediary channel portion which internally closely surrounds portions of the spring for buttressing the transition section of the spring, and those coils of the main body proximate thereto, from off-axis excursions.
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Advertisement in Trade Journal entitled "SNIPS," dated Sep., 1989.
Bay Jonathan A.
Jones David
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