Patent ID: 7955055

Claim:
An industrial fan comprising: a mounting assembly that is adapted to mount the fan to a surface of a building; a motor that is mounted to the mounting assembly, wherein the motor defines a shaft; a hub assembly that couples to the shaft of the motor such that rotation of the motor shaft results in rotation of the hub; a plurality of fan blades that mount to the hub assembly; and a securing assembly interposed between the hub and the mounting assembly, wherein the securing assembly comprises a first member that is coupled to the hub and a second member that is coupled to the mounting assembly and wherein the first and second members each define an opening through which the motor shaft extends and a flange surrounding the opening and wherein the flange of the first member is radially larger than the opening in the second member through which the motor shaft extends and is radially smaller than the width of the flange of the second member so that the first and second members engage with each other such that the hub is inhibited from falling when the motor shaft breaks or the hub otherwise disengages from the shaft.