Expansible bag

Abstract

An expansible bag comprises a bag body and two inner leaves. The bag body is made of airtight material and provides an inner chamber therein with an inlet communicating with the external atmosphere. The inner leaves are membranes attached to an inner wall of the bag body and provide two pressing stripes at a lateral side thereof respectively in a way of keeping a respective clearance path joining a part thereof to the bag body at both lateral sides of the clearance path respectively. The respective clearance path communicates with the inlet so that the bag body can be filled with fluid.

What is claimed is:  
     
         1 . An expansible bag, comprising 
 a bag body, being made of airtight material, providing an inner chamber therein, and having an inlet communicating with an external part; and    two inner leaves, being membranes attached to an inner wall of the bag body, providing two pressing stripes at a lateral side thereof respectively in a way of keeping a respective clearance path, joining a part thereof to the bag body at both lateral sides of the clearance path respectively, and the clearance path communicating with the inlet for the bag body being filled with the fluid.    
     
     
         2 . The expansible bag according to  claim 1 , wherein the bag body with the inner leaves is made of high molecular membrane.  
     
     
         3 . The expansible bag according to  claim 1 , wherein the joining of the bag body and the inner leaves are performed by way of high frequency welding.  
     
     
         4 . The expansible bag according to  claim 1 , wherein the bag body is formed with two membrane pieces and the inlet is disposed at a periphery of the bag body.  
     
     
         5 . The expansible bag body according to  claim 1 , wherein both of the clearance paths have a different length feasible for a tube inserting into the bag body.  
     
     
         6 . The expansible bag according to  claim 1 , wherein the inlet coincides an outer section of the respective clearance path.  
     
     
         7 . The expansible bag according to  claim 1 , wherein the fluid is gaseous fluid or the liquid.