Abstract: Disclosed is an improved serial impact printer which both prints and serrates a document. The printer includes a print wheel which is rotated to position a selected character in front of an anvil. The print wheel includes a wheel-like circular member having print characters at the end of fingers which extend from the top of the print wheel's perimeter. An impact mechanism pressures the selected print character against the anvil, the document being positioned between the selected print character and impact mechanism. The impact mechanism includes a d.c. motor which turns a threaded shaft which is engaged with a threaded hole in the end of a hammer. Counterclockwise motion of the d.c. motor advances the hammer's head to pressure the back of the print character against the anvil, thereby printing and serrating the document with the selected character. Thereafter, clockwise motion of the d.c. motor restores the impact mechanism to its original position.

Abstract: The invention pertains to a vehicle frame particularly suitable for use with fire truck aerial apparatus wherein the frame comprises a torque box highly resistant to twisting and deformation. The frame is of a box configuration, fully enclosed, wherein the bottom surface is inwardly recessed to provide clearance for the vehicle driveshaft, and to provide rigidity and resistance to twisting, internal K-bracing plates are welded to the lateral and bottom frame portions.

Abstract: A trailer for supporting aerial apparatus having a boxlike frame defining a receptacle for receiving counterweight material such as cement or steel shot. Reinforcing partitions within the frame define a torque box highly resistant to frame twisting.