Patent ID: 7587983
Filing Date: 2009-09-15
Classification: A47B

Abstract:
1. A drive mechanism for attachment to an existing body having an outer wall, wherein said body has a plurality of load bearing track engaging wheels that allow said body to move back and forth along a load bearing track, said drive mechanism comprising: an actuator attached outward of said outer wall of said body that is driven, a non-load bearing drive wheel mounted to pivot by a pivot connection that is located entirely outward of said outer wall of said body and with respect to said body so that it engages a stationary surface adjacent said body, said stationary surface being distinct from said load bearing track, said drive wheel and said actuator located on the same side of said load bearing track and outward of said outer wall of said body, and a drive coupling mechanism between said actuator and said drive wheel wherein actuation of said actuator causes rotation of said drive wheel which moves said body along said load bearing tracks, wherein the load bearing track engaging wheels and the non-load bearing drive wheel are rotatably mounted about respective horizontal axes separate from said pivot connection, and wherein said stationary surface extends parallel to and horizontally alongside said load bearing track.