Manufacturing of Sliding Door Hardware

Date1920s

AbstractIntertitle: “The Manufacture of Sliding Door Hardware by the Coburn Trolley Track MFG.CO. Holyoke, MASS.” ; Intertitle: “DRILLING HOLES IN TROLLEY WHEELS ON MULTIPLE SPINDLE DRILL” followed by shot of man at the multiple spindle drill. Intertitle: “RIVETING CARRIER FRAME” followed by man at machine working on frames. Intertitle: “TURNING HANGER PARTS ON AUTOMATIC SCREW MACHINE MAKING BALL SEATS FOR GARAGE DOOR HANGERS” followed by footage of machine working, man shows example of ball seat. Intertitle: “TURNING EDGE ON TROLLEY WHEELS [next line] WHEELS BEING TURNED ARE 3 INCHES IN DIAMETER” followed by man placing wheels onto a machine.