Integral series parallel and power brake controller for a transit vehicle
AssigneeWestinghouse Electric Corp.
InventorWilliam E. Schmitz
Life of this patent
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Abstract
An integral series parallel changeover and power dynamic brake controller apparatus for a transit vehicle disclosed. The controller utilizes a single cam shaft to operate switches for the series parallel function and the power brake function. The apparatus includes a cam shaft return spring which is latched out during normal operation. Upon a power failure the spring is released. An escapement mechanism is provided to slow the rotation of the cam shaft upon the spring being released to provide for desirable sequential operation of the power circuit.
Claims13
An integral series parallel changeover and power dynamic brake controller apparatus for a transit vehicle, said vehicle including a plurality of wheels, electrical motors for driving said wheels, said electrical motors each having armature means and field means, power source means for providing power to said electrical motors, said controller apparatus comprising:
- (a) a frame means;
- (b) a single cam shaft carried by said frame means;
- (c) switching means for switching said electrical motors from a parallel circuit arrangement to a series circuit arrangement as desired and for switching electrically said field means and said armature means of said electrical motors as desired to effect dynamic braking;
- (d) a plurality of cams, said cams mounted on said cam shaft to engage said switching means at predetermined intervals;
- (e) control motor means for rotating said cam shaft in a controlled manner;
- (f) cam shaft stop means for maintaining the rotation of said single cam shaft between a predetermined starting point and a final point;
- (g) cam shaft return spring means for rotating said cam shaft back to said starting point in case of loss of power to said control motor means;
- (h) cam shaft return spring latch means for preventing said spring means from opposing said control motor means during normal operation.
Dependencies are inferred from the claim text.