A NEW PLASTER KNIFE

Abstract

This knife is designed to facilitate the cutting down of plaster casts and comprises a handle, shaft, removable standardized blades, and a hand rest for pressure on the blades, an eight pointed revolving wheel on the under surface of the shaft, and a pick at the end of the handle. The accompanying illustration shows the parts of the knife individually and assembled for operation. Two knife blades operate parallel to each other at one end of the knife, with their beveled edges away from each other. They serve to cut a strip of plaster, thus obviating any possibility of jamming of the knife blades, which is a common occurrence with the usual type of plaster knife. The blades are standardized and easily replaced by unscrewing a circular knob, which holds them in position. The change of blades can be accomplished in a few seconds. The knob serves an additional purpose