VEX Lifts (Devices that extend upwards) - ppt download
{"Image DocumentName": "Single Stage Chain Lift", "Image ImageDescription": "The motors are attached to the robot. The chain is zip-tied to the lift. The lift goes up and down with the chain. CanBot posted on  by VexLABS.", "Image XResolution": "300", "Image YResolution": "300", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}