Dust proof plaster cast cutter and a safety device therefor

摘要

An alarm device circuit includes an alarm device 17 and means 21 for energizing said alarm device; and a circuit breaking means connected in series with said alarm device and said energizing means, one terminal of the circuit breaker means being a conductor 16 embedded in a plaster cast 14 to be cut, which conductor is close to the skin of a patient and made of such a material as not to obstruct both the cutting operation by said cutting blade and the transmission of an X-ray, and the other terminal being cutting blade 11, whereby, when said cutting blade contacts said conductor, said alarm device circuit is made through said circuit breaking means thus to energize said alarm device. The dust-proof plaster cast cutter comprises a cutting blade 35, means for operating said cutting blade 13, a casing 38 having its lower side opened, a blade cover 44 so fitted in said casing that it retracts as the cutting operation by said cutting blade proceeds, means 46 for urging said blade cover to cover said cutting blade, a suction hose 43 having communication with a vacuum source, a dust collection chamber 42 connected to said suction hose, and means 52 for providing communication between said dust collecting chamber and the inside of said blade cover irrespective of the moving position of said blade cover, whereby the dust or chips resulting from the cutting operation by said cutting blade are collected in the dust collecting chamber.