INFLATABLE SHAFT
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. Field of the Invention
This invention relates to an inflatable shaft, particularly to one able to keep a stuff directly wound around after the inflatable shaft is inflated and easily separated from the wound stuff after deflated, needing to use no additional shaft, not only lowering manufacturing cost but also amiable to environment.
2. Description of the Prior Art
Commonly, a stuff (A), such as shrinking film, packaging film or winding film etc., is wound around a tube 10 inserted with a conventional inflatable shaft 1. The tube 10 is made of paper or plastics etc. With the inflatable shaft 1 installed and inflated on a winding device, the tube 10 can be driven to rotate to wind up the stuff (A). As shown in
The object of this invention is to offer an inflatable shaft able to keep a stuff directly wound around with the inflatable shaft inflated and easily separated from it with the inflated shaft deflated, not needing to use an additional shaft, not only lowering manufacturing cost but also amiable to environment.
The inflatable shaft of the invention is characteristically provided with a rubbery sleeve mounted around the outer wall of its outer pressing boards.
This invention is better understood by referring to the accompanying drawings, wherein:
As shown in
In using, as shown in
It is to be noted that, with the rubbery sleeve 26 mounted around the outer pressing boards 24 to expand outward while inflating the air bag, the gaps (B) formed among the outer pressing boards 24 are covered by the rubbery sleeve 26 that can be wound with the stuff (A) smoothly without having the stuff (A) sunk into the gaps (B) and clamped by the outer pressing boards 24 as happening in the conventional inflatable shaft. And, as the rubbery sleeve 26 can follow the outer pressing boards 24 to shrink inward while deflating the air bag 21, the space (C) is to be formed between the rubbery sleeve 26 and the wound stuff (A) to enable the stuff (A) easily separated from the deflated shaft 2. Therefore, by means of the inflatable shaft 2 of the invention, the stuff (A) can be smoothly wound without using an additional tube, not only lowering manufacturing cost but also amiable to environment.
While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.
Claims
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.
Type: Application
Filed: Nov 5, 2008
Publication Date: May 6, 2010
Inventor: Chun-Tsai CHEN (Tainan Hsien)
Application Number: 12/265,710
International Classification: D21G 1/02 (20060101);