Drive wheel conveyor

A drive wheel conveyor comprising:

• a tubular side frame extending in a transport direction and having an integrally formed inner side wall, outer side wall, top wall and bottom wall which extend continuously throughout substantially the entire length of said frame to form an enclosure structure,
• a drive shaft supported at axially spaced locations by the inner and outer side walls so as to extend through said enclosure structure of the side frame transversely thereof and having an inward projection extending inward through the inner side wall,
• a sprocket fixed to the drive shaft and positioned within said enclosure structure between the inner and outer side walls thereof,
• an endless drive chain in engagement with the sprocket and disposed inside the enclosure structure defined by said side frame so as to be movable in circulation,
• a transport wheel having a shaft bore with the inward projection fitted therein and drivable by frictional resistance between an inner peripheral surface of the wheel defining the shaft bore and the outer surface of the inward projection, said top wall being formed with a slit extending in the transport direction,
• a top cover attached to an upper surface of the top wall to close the slit, and
• a chain guide being attached to and depending from a lower surface of the top cover.