Raceway for supporting and guiding a power chain

An elongated chain raceway for an apparatus having a carriage movable lengthwise above said raceway along a preset path of travel, conduit means for supplying said carriage during said lengthwise movement, said conduit having a fixed end connected to supply means positioned below said raceway centrally of the path of travel of the carriage and a movable end having an upwardly-projecting connection to said carriage, and a flexible chain to hold said conduit means, said chain extending from the supply means toward one end of the raceway and doubling back over itself toward the opposite end of the raceway to said conduit's connection with the carriage, whereby when said carriage is positioned between said supply means and said one end of the raceway the chain is doubled back over itself beyond said carriage, and when said carriage is positioned between said supply means and said opposite end of the raceway the chain is single between said carriage and said supply means and is doubled back between the supply means and said one end of the raceway, said raceway extending along the length of the path and having a bottom supporting the weight of the chain and upstanding sidewalls limiting lateral movement of said chain;

• said sidewalls being of a height at said one end to limit lateral movement of said doubled back chain, and at said opposite end to limit lateral movement of said single chain, and the raceway between the supply means and said opposite end of the path having an opening between the tops of said sidewalls affording longitudinal displacement within said opening of said conduit connection as said carriage moves from said supply means toward said opposite end, said opening being dimensioned to stop upward displacement of the chain out of the raceway between said sidewalls;
• wherein said chain has a uniform height throughout its length, said sidewalls having top edges disposed at a common height relative to said carriage, said raceway bottom being positioned below said common height by a distance greater than said uniform chain height at said opposite end of the raceway and by a distance greater than twice said uniform chain height at said one end of the raceway;
• and
• further wherein said raceway bottom at said opposite end of the raceway is also below said common height by a distance greater than twice said uniform chain height and forms a ramp to a distance corresponding to said uniform height above the bottom in said opposite end of the raceway adjacent said supply means.