the non-moving party, the facts out of which this case arises are as follows:
On March 13, 1972, Plaintiff Robert C. Schell was injured during the course of his employment at the Harrisburg Plant of third-party Defendant Capital Bakers, Inc. The machine which was involved in the accident was a "Pan-O-Mat" manufactured by Union Machine Company, which is now a part of AMF. The Pan-O-Mat's function in the baking process is to receive roll-shaped pieces of bread dough from another machine and place them on baking pans to "rest". The unbaked rolls are fed from the preceding machine onto a series of cups which are conveyed upwardly by the Pan-O-Mat toward the falling dough. At the transfer point, the dough occasionally misses the appropriate cup and falls to the floor beneath the Pan-O-Mat. In order to collect the fallen dough, the machine which is the subject of this suit is equipped with an "excess" tray which fits beneath it.
The conveyor to which the Pan-O-Mat's receiving cups are attached is driven by a series of chain and sprocket drives. On each side of the machine is a large guard door which blocks access to the working mechanisms. By making use of a gap between the door bottoms and the floor, the excess tray is designed to slide freely from beneath the guards on either side of the machine. The tray can be removed, emptied, and replaced without opening either guard door or shutting down the Pan-O-Mat. Use of the excess tray during a production run is necessary to avoid a build-up of dough which could eventually foul the working mechanisms of the machine.
In order to comply with baking industry sanitation standards, accessibility to the area behind the guard doors is required and that area is cleaned at least every four hours.
On March 12, 1972, Schell reported to work at approximately 11:00 P.M. During the early part of his 9-hour shift, Schell performed his usual job of feeding pans into the Pan-O-Mat. About 15 minutes before the accident, he was given the responsibility of operating the machine -- a task he had not previously performed. As operator, he was required, inter alia, to prevent a dough build-up beneath the Pan-O-Mat. Schell observed that excess dough at the bottom of the machine and behind the door had accumulated to such an extent that the tray could not be removed without opening the guard door. He and a fellow worker opened the door and removed the tray full of dough. His co-worker did not help Schell empty the tray and it was too heavy for Schell to accomplish alone. Consequently, the machine continued to operate without an excess tray in position. Schell returned to the Pan-O-Mat and attempted to brush away dough that was accumulating beneath the machine. With the door still open and the Pan-O-Mat running, he went down to his knees, leaning with his left hand on the floor and intending to reach into the area ordinarily occupied by the excess tray. At that moment, he lost his balance and his arm became entangled in the chain and sprocket mechanism of the Pan-O-Mat. His injuries were so severe that amputation was required.
Schell sued AMF alleging a right to recovery under the doctrine of "strict liability" as embodied in § 402A of the Restatement (Second) of Torts and as adopted by Pennsylvania in Webb v. Zern, 422 Pa. 424, 220 A.2d 853 (1966).
The alleged defects in the Pan-O-Mat are:
(1) The absence of an interlock mechanism which shuts down the machine when a guard door is open;