This creation is that a kind of recoverable telescopic rod of rack-and-pinion climbs rank wheel apparatus,Main system include wheel,Flexible head,Crank mandril,Motor A,Wheelchair chassis,Bearing,Driving wheel axle center,Motor B,Flexible rod sleeve,Padlock element,Spring,Telescopic rod is formed with padlock protrusion,Wherein the wheel has multiple groups telescopic rod,Rack gear on telescopic rod is clasped with the padlock element on flexible rod sleeve clasps telescopic rod,Because also attacking several teeth on padlock element,It can closely be clasped with the rack gear on telescopic rod,The crank mandril that motor A is rotatably coupled,When wheel meets obstacle,Motor A rotation, which makes crank mandril stretch out top, to be opened padlock element to padlock protrusion and so that the rack gear on padlock element is no longer clasped the rack gear of telescopic rod and loosen,Spring pops up telescopic rod once again.本創作係一種齒條式可收回伸縮桿之爬階輪裝置，主要係包括輪子、伸縮桿頭、曲柄頂桿、馬達A、輪椅底盤、軸承、驅動輪軸心、馬達B、伸縮桿套筒、扣鎖元件、彈簧、伸縮桿與扣鎖凸部所組成，其中該輪子有多組伸縮桿，伸縮桿上的齒條與伸縮桿套筒上的扣鎖元件扣住將伸縮桿扣住，因為扣鎖元件上也有攻數個齒牙，可與伸縮桿上的齒條緊密扣住，馬達A可轉動耦接的一曲柄頂桿，輪子遇障礙時，馬達A轉動使曲柄頂桿伸出頂到扣鎖凸部使扣鎖元件頂開而使扣鎖元件上的齒條不再扣住伸縮桿的齒條而鬆脫，彈簧再度彈出伸縮桿。
