Abstract: A dance shoe having an upper and an underfoot portion, the underfoot portion includes a sole shank, consisting of a relatively rigid structure, extending longitudinally in the shoe over at least a forefoot portion of the shoe and at least partially over a midfoot portion. The sole shank has at least one hinge with a unidirectional stop disposed widthwise in the sole shank. The sole shank covers at least the forefoot portion of the underfoot area and it locks to support plantar flexion and hinges to facilitate dorsiflexion of the foot. To facilitate en pointe movements, the sole shank may be coupled to a rigid distal part of the shoe, such as a toe box. The inventive subject matter is also directed to dance shoes, as well as the sole shanks themselves, and to methods of making the sole shanks and using the sole shanks in assemblies.

Abstract: A system for reducing the voltage of an AC electrical supply to a load for the purpose of energy efficiency, comprising a transformer and power converter in circuit between an AC electrical supply and a load, and a bypass switch S to cause the transformer to be taken out of circuit and to connect the electrical supply to the load in the event of a sustained overload of the transformer. The system includes means (14) to measure the temperature of the transformer, means (17) to measure the electrical current in the circuit and control means (15) receiving signals from the sensors (14, 17) and to operate bypass switch S to bypass the transformer and allow it to cool. A fuse F2 and thermal cut out device (16) are in circuit with the secondary winding of the transformer as failsafe means to interrupt the supply to the transformer in the event that the bypass switch fails to operate.