Abstract: A drive system comprising an endless tread belt made up of identical tread belt links and a cooperating drive tumbler is disclosed. The link is formed with a ground engaging bottom face, a drive wheel engaging top face, and connecting ears along its forward and aft sides which are suitable to interdigit with the ears of other links so as to form a belt. The link also has a guiding cog rising upwardly from the central region of the top face, a bearing surface on each lateral side of the guiding cog, aligned drive surfaces on the forward and aft sides of the guiding cog located between the link bottom face and link top face, and a slot in alignment with the drive surfaces.

Abstract: An improved drag chain sprocket comprising two spaced-apart discs on a hub with removable teeth bolted to the discs. The open design of the sprocket prevents build-up of abrasive materials between the sprocket and the chain. The mounting position of the teeth may be altered to utilize unworn surfaces, thereby extending the working life of the sprocket.

Abstract: A conveyor belt cleaning device has a scraper blade element, preferably supported by a carrier, which is urged into contact with a surface to be scraped by a pressurized flexible-walled bag. The pressurization of the bag maintains the scraper blade in contact with the belt and ensures a uniform contact pressure over the entire length of the blade.

Abstract: A sprocket wheel with a generally equilateral polygonal rim and a plurality of spaced axially aligned teeth extending from at least one side of the rim.