Abstract: In a brushcutter for cutting lawn, grass, weeds and the like, a blade fixing device which can prevent a blade driven by an engine and rotating at a high speed from being severely damaged due to stone or other obstacles and can reduce the load of the engine, by fixedly installing the blade on a drive shaft with a compressive force of a spring. In the brushcutter having an engine mounted on a main body provided with a plurality of wheels mounted thereon, and a clutch and a blade mounted on the drive shaft of the engine, an adaptor is fittingly fixed into the drive shaft rotatably driven by the engine. A holder is disposed on the lower end of the adaptor and is coupled to the adaptor and the drive shaft by means of a fixing bolt. A blade is fitted into the periphery of the holder to be rotatably coupled thereto. Also, a spring is fittingly inserted between the adaptor and the holder and is mounted so as to compressively contact the blade.

Abstract: A superconducting current limiting device protects an electric circuit from a fault current. The device comprises a magnetically saturable core having saturated and non-saturated states and an input coil for electrically coupling the core to the electric circuit, the input coil drawing a current therethrough so that a magnetic flux is generated in the core due to the current. Further, the core includes a main path for drawing the generated magnetic flux and at least two magnetic paths, a first of the magnetic paths drawing a first portion of the magnetic flux, and a second of the magnetic paths drawing a second portion of the magnetic flux and having a damping element for cancelling at least a fraction of the second portion of the magnetic flux to thereby prevent the core from getting into the saturated state.