Automated pneumatic door skin hammer

Door skin hammer apparatus adapted for activation by a conventional pneumatic door hammer comprising:

• a frame supporting an axially slidable striking hammer having a head adapted to mate with an anvil equipped with a resilient bed member;
• means for selectively mounting the striking hammer in one of two operative positions as crimping of a vehicle door skin edge progresses from an angle of approximately 90° to the generally planar share of the door skin to a finished fully-folded shape encasing the door edge;
• said anvil and said striking head being mountable on opposite sides of the vehicle door skin edge so as to fold said door skin edge about said door edge;
• the first position being established at a selected angle between the approximately ninety-degree initial configuration of the door skin edge and 90° to the plane of the door skin;
• and
• the second position being established at an angle essentially perpendicular to the plane of the door for achieving complete crimping of the door skin to the door frame;
• wherein said frame comprises an upper body head for coupling to said air hammer and a hollow lower body head coupled to the upper body head by a pair of mutually adjustable arms mounted in a configuration to maintain said anvil in alignment with said striking hammer;
• and
• wherein said anvil is fixed on the end of a shaft which is slidable within said hollow lower body head between positions defined by a pair of latching recesses on said shaft.