Patent ID: 7311161
Filing Date: 2007-12-25
Classification: A61G,B62B

Abstract:
1. A hospital bed comprising: a carrier frame; at least one driven wheel unit disposed below said carrier frame; a drive wheel unit disposed below said carrier frame, and having a motor unit coaxially coupled and rotated in such a manner that actuation of said motor unit results in rotation of said drive wheel unit; and a lifting-and-lowering device including a holding shaft disposed below to said carrier frame in such a manner that said holding shaft extends parallel to said carrier frame, a first gear fixed securely on said holding shaft, and a fork unit having upper threaded portion meshed with said first gear and a lower portion, said drive wheel unit being journalled to said lower portion of said fork unit such that rotation of said holding shaft results in lowering and lifting said drive wheel unit between an upper position and a lower position.