Inflatable shaft

Abstract

An inflatable shaft mainly includes an elastic rubbery sleeve mounted around the outer wall of plural outer pressing boards and able to expand outward to cover gaps formed among the outer pressing boards while inflating the inflatable shaft, so as to provide a seamless exterior surface for the air expanding shaft to be directly wound with a stuff without having the stuff sunk or clamped. And, the rubbery sleeve can shrink inward together with the outer pressing boards while deflating the inflatable shaft, forming a space between the rubbery sleeve and the stuff to enable the stuff easily separated from the deflated shaft. Thus, the stuff can be smoothly wound around the inflatable shaft inflated without using an additional tube, not only lowering manufacturing cost but also amiable to environment.

1 . An inflatable shaft comprising a tubular main body, an air bag installed inside said main body, a plurality of inner pressing boards attached to an outer wall of said air bag, a space formed between said inner pressing boards and said main body, a plurality of outer pressing boards attached to an outer wall of said main body, a plurality of connecting bars penetrated through said main body to connect said inner pressing boards with said outer pressing boards; and
 said inflatable shaft characterized by having a rubbery sleeve mounted around said outer pressing boards.