Abstract: A material handling system includes a composite beam including an upper rail and a lower track connected through a plurality of spaced apart transverse members. A trolley includes an upper set of wheels and a lower set of wheels. The lower set of wheels is received within two parallel channels defined by the lower track. A drive tube is positioned between the upper rail and the lower track such that the upper set of wheels are in frictional engagement with the drive tube. A drive system is configured to rotate the drive tube.

Abstract: A material handling system includes a first independent track assembly configured to transport a forward trolley along a first path, and a second independent track assembly configured to transport a trailing trolley along a second path. The second path is substantially parallel to the first path. A carrier is configured to support an article and has a first end pivotably supported by the forward trolley and a second end pivotably supported by the trailing trolley. The material handling system also includes a third independent track assembly configured to transport the forward trolley and the trailing trolley along a third path. Each of the first independent track assembly, the second independent track assembly, and the third independent track assembly includes an independent drive system for independently moving a respective one of the forward trolley and the trailing trolley and a station control system including a microprocessor in communication with the independent drive system.

Abstract: A manufacturing line includes a plurality of manufacturing modules positioned in series and defining a main path through the manufacturing line. A main track assembly is supported by the manufacturing modules and includes at least a first friction drive system for transporting a trolley assembly along the main path. A buffer is positioned to receive the trolley assembly from the main path and includes a first track assembly that includes at least a second friction drive system for transporting the trolley assembly along the first track assembly. The first track assembly is sized to support at least two trolley assemblies thereon. The sequencing buffer also includes a second track assembly that includes at least a third friction drive system for transporting the trolley assembly along the second track assembly. The second track assembly is also sized to support at least two trolley assemblies thereon.

Abstract: A material handling system includes a composite beam including an upper rail and a lower track connected through a plurality of spaced apart transverse members. A trolley includes an upper set of wheels and a lower set of wheels. The lower set of wheels is received within two parallel channels defined by the lower track. A drive tube is positioned between the upper rail and the lower track such that the upper set of wheels are in frictional engagement with the drive tube. A drive system is configured to rotate the drive tube.

Abstract: A lobed bushing is provided for a track assembly of a track-type machine. The track assembly includes a first chain and a second chain coupled together with a track pin. A bushing, defining a longitudinal axis, includes a central bore oriented along the longitudinal axis and extending from a first end of the bushing to a second end of the bushing for receiving the track pin. The bushing includes a first lobe positioned at a first location about the longitudinal axis and a second lobe positioned at a second location about the longitudinal axis that is less than about 180° from the first location. The first end of the bushing has a substantially cylindrical shape.

Abstract: A manufacturing line includes a first line and a second line. The first line includes a first plurality of stationary modules positioned in series and defining a first path through the first line, and a first friction drive system for transporting an article along the first path. The second line includes a second plurality of stationary modules positioned in series and defining a second path through the second line. The second line also includes a second friction drive system for transporting the article along the second path. A mobile module is supported by ground-engaging elements and includes a third friction drive system for transporting the article along a third path defined by the mobile module. The mobile module is movable between a first position defining a first continuous path along the first path and third path, and a second position defining a second continuous path along the second path and the third path.

Abstract: Propelling mechanism for forwarding a carrier of a power and free conveyor from the delivery end of a first carrier supporting track onto a track section of an elevator and thence onto the receiving end of a second carrier supporting track. The elevator includes a carriage to which the track section is attached and which is movable longitudinally to permit the track section to be extended from the elevator into registry with either the first or second carrier supporting track. A propelling member, consisting of a pair of roller chains connected in spaced side-by-side relation, is equipped at one end with a carrier pusher, is connected at the other end to an endless output chain of a reversible drive mounted on the carriage, and is supported and guided by tracks which extend parallel to the track section from the entrance end thereof and into a storage path parallel to the path of the endless output chain.