Abstract: A link and a chain formed therefrom, wherein the links comprise a shaft portion having first and second opposing ends defining therebetween a longitudinal axis for the link; an enlargement portion connected to the shaft portion at the first end, the enlargement portion having a width which is greater than a width of the shaft portion at the first end; and a mandorla shaped portion having first and second apertures therein, the mandorla shaped portion being connected to the shaft portion at the second end, and the apertures being shaped so as to prevent the enlargement portion from passing therethrough.

Abstract: A motor speed controller for use with dc motors, such as found in model (slot) cars, is provided by a plurality of pairs of oppositely-poled voltage-sensitive threshold conduction devices which are selectively connected so as to be controllably inserted between a source of operating voltage and the dc motor. In a preferred embodiment of the invention, the voltage-sensitive threshold conduction devices advantageously comprise a series connection of diode bridges which are sequentially included in the energizing path of the motor.Furthermore, the controller provides a speed sensitive brake function by controllably connecting at least one voltage-sensitive threshold conduction device across the windings of the dc motor. When so connected, this allows the voltage generated by the spinning motor to cause the voltage-sensitive threshold conduction device to be conductive until the motor speed slows to the point that the generated voltage no longer causes the device to conduct.

Abstract: A rotor lamination for a permanent magnet synchronous machine. The rotor lamination can be used for a two, four or eight pole synchronous machine. The orientation of the permanent magnets determines the number of poles of the machine. The lamination can also include openings adapted to contain conductors used to bring a synchronous motor up to synchronous speed as an induction motor.