A kind of auxiliary wheel device of hospital bed cast,It is the auxiliary wheel device that installing one can be freely turned with bed wheel synchronous manipulation with limitation straight trip among a bedstead bottom,It mainly includes that axis sets the top turntable portion edge of the rotating seat unit being freely rotated on what hospital bed and is equipped with opposite two notches,And turntable subordinate's square shaft be equipped with one can before Hou swing auxiliary wheel unit seat part,And the auxiliary wheel unit include its lower end installing wheel,And can allow and take turns the elastic wheel seat tight against on what ground,And then installing one can swing in or show the locating plate of the notch in what turntable portion with synchronously control is kept straight on the turning of bed wheel on bedstead； Therefore the straight movement control in addition to penetrating auxiliary wheel device,Other than the stabilization for increasing hospital bed direction of travel,The smooth of hospital bed turning can more be promoted because of the rotatable effect of auxiliary wheel device,Have the function of elastic buffer again when at ground injustice of advancing simultaneously,The radius of gyration approach what zero of auxiliary wheel when also further hospital bed being enabled to turn round in situ simultaneously,Increase the flexibility ratio and easiness of hospital bed operation.一種病床原地迴轉的輔助輪裝置，是一床架底部中間裝設一可與床輪同步操控自由轉彎與限制直行的輔助輪裝置，其主要包括有軸設於病床上而自由轉動的旋轉座單元的頂端轉盤部邊緣設有相對兩缺口，且在轉盤部下方軸設有一可前後擺動之輔助輪單元的支座部，而該輔助輪單元包括有一其下端裝設輪子、並能讓輪子彈性緊抵於地面上的輪座，進而在床架上裝設一可與床輪之轉彎與直行同步控制而能擺入或擺出於轉盤部上之缺口的定位片；故除了透過輔助輪裝置的直行控制，增加病床行進方向的穩定以外，更可因輔助輪裝置的可迴轉作用而增進病床轉彎的順暢，同時行進地面不平處時又具有彈性緩衝的作用，同時也再進一步的令病床在原地迴轉時輔助輪的迴轉半徑趨近於零，增加病床操作的靈活度與容易性。
