Anti-tip device for wheelchair

For use with a wheelchair adapted to roll on a surface and having a frame including a tubular lower rail, an anti-tipping device including an extension having one end rotatably and axially telescoped within said lower rail, said extension extending from a rear end of said lower rail, said extension being bent so that in a first position the end of said extension from said lower rail reaches a point near said surface, motion transmitting means for rotating and sliding said extension affixed to said extension, said motion transmitting means extending axially through said lower rail, and operating means for rotating and sliding said motion transmitting means connected to said motion transmitting means adjacent a front end of said lower rail whereby said extension can be moved rotatably to rotate said extension from the position with one end near the surface to a second position where that end is remote from said surface.