Abstract: A prosthetic ankle for use between the ankle block forming the bottom end of a prosthetic lower leg, and a prosthetic foot, comprising a securing bolt extending upwardly through a hole in the foot and screwed into a nut in the ankle block. Under the head of the bolt are two cupped washers that provide a ball-and-socket connection which allows angular movement of the ankle block in all directions with respect to the foot, as well as rotational movement. A pad of elastomeric material is interposed between the top surface of the foot and the bottom surface of the ankle block, and is cemented to the top surface of the foot. The pad is of a thickness and hardness such that when the ankle block is leaned in any direction, the elastomeric material on the inside of the lean is compressed. Pins project downwardly from the bottom surface of the ankle block and are received in cavities in the elastomer. When a torsional stress is exerted on the ankle block, the pins exert a torsional in the elastomer.

Abstract: A fixture for precisely locating the vertical reinforcing steel bars in a hollow block wall at the exact positions specified by the design engineer. The fixture comprises one or more steel wires forming a horizontal supporting structure that is adapted to be laid on the top surfaces of the blocks at various levels as the blocks are being laid. In the preferred form, the horizontal supporting structure is a ladder-like structure made up of two laterally spaced, parallel wires connected together at intervals by cross wires. Certain of the cross wires have circular rings formed therein or attached thereto, and all of the cross wires have downwardly projecting legs that extend down into the cavities of the hollow blocks and engage the inner surfaces thereof to locate the ladder-like structure with respect to the blocks.