Abstract: A low cost switching mode power supply particularly adapted for use in an electric vehicle is characterized by an extreme input voltage range, immunity to high input voltage transients, and stable operation. A negative voltage feedback arrangement applied to a controllable voltage clamp serves to continuously vary oscillation pulse width and frequency. The power supply includes an output filter capacitor, and, to compensate for phase lag introduced by the output filter capacitor, the negative feedback arrangement includes elements for introducing phase lead compensation. Preferably, the oscillation period is less than the duration of expected input voltage transients, and the power supply regulates right through such transients.

Abstract: A self-adjusting brake having a pair of brake shoes movably mounted and arranged in end-to-end relationship on a fixed backing plate. A pair of levers is pivotally mounted on the backing plate. The levers are interposed between a pair of opposed brake shoes and a hydraulic actuator for moving the brake shoes into engagement with the brake drum. A brake gap adjuster extends between and separates the other opposed ends of the brake shoes. The adjuster includes a rod having a threaded end engaged within a threaded bore of a first hollow sleeve, and a smooth end rotatably mounted within a smooth bore of a second hollow sleeve. A driving washer having camming surfaces is spring biased into meshed engagement with complementary camming surfaces of a driven washer which is fixedly mounted on the adjuster rod. The driving washer is rotatably mounted on the adjuster rod and is operatively connected to one of the brake levers through a bellcrank lever and rigid connecting rod.

Abstract: A mechanically actuated parking brake having a pair of brake shoes movably mounted and arranged in end-to-end relationship on a fixed backing plate. A pair of levers is pivotally mounted on the backing plate. The levers are interposed between a pair of opposed brake shoe ends and a hydraulic actuator for moving the brake shoe into engagement with the brake drum upon actuation of the vehicle service brake. The branch legs of a Y-shaped cable extend between the swinging ends of the levers with the main cable leg extending about a pulley and connected to a windup reel. The windup reel is rotatably mounted on one end of a brake actuating handle, with the other end of the handle being connected to a parking brake actuating pedal or lever. Application of the vehicle parking brake rotates the windup reel upon rotation of the handle which tensions the cable and draws the lever ends inwardly and expands the brake shoes outwardly into engagement with the brake drum.