Patent ID: 8505838

Claim:
A material spreader comprising: a frame comprising a surface that is attachable to an associated vehicle; an auger that is rotatably supported to the frame and used to transfer an associated granular material from the associated vehicle to an associated ground surface; a first door that is movable with respect to the frame between: (1) a first closed position where the first door covers at least a portion of the auger; and, (2) a second open position where the first door does not cover the at least a portion of the auger; an electric power supply supported to the frame; an electric supply line that supplies electric power from the electric power supply to the auger to operate the auger; and, an electric interlock mechanism comprising: (A) a first member electrically attached to a first portion of the electric supply line; (B) a second member electrically attached to a second portion of the electric supply line; and, physically supported to the first door so that the second member moves with the first door as the first door is moved between the first closed position and the second open position; and, (C) wherein the electric interlock mechanism is adjustable between: (1) a first condition where: the first member is electrically engaged to the second member; the electric supply line can supply electric power to operate the auger; and, the first door cannot be moved into the second open position; and, (2) a second condition where: the first member is electrically disengaged from the second member; the electric supply line cannot supply electric power to operate the auger; and, the first door can be moved into the second open position; and a second door that is pivotal with respect to the frame between: (1) a first closed position where the second door covers at least a portion of the auger; and, (2) a second open position where the second door does not cover the at least a portion of the auger; wherein: (1) when the electric interlock mechanism is in the first condition the second door cannot be moved into the second open position; and, (2) when the electric interlock mechanism is in the second condition the second door can be moved into the second open position; wherein the first door is pivotal with respect to the frame between the first closed position and the second open position; and wherein the first door comprises a stop member that prevents the second door from being opened unless the first door is first opened.