Packing assembly for cylinder casing

Abstract

A packing assembly for a cylinder is clamped between two parts of a casing of a cylinder between which a piston is received. The piston has a shaft which extends out from the casing of the cylinder. The packing assembly includes two seal frames connected to the two parts and the packing is clamped between the two seal frames. The packing includes a seal portion in contact with a top and a bottom of the piston. A seal tongue extends from the inner periphery of the packing and is in contact with inside of the two parts so as to seal the conjunction portion of the two parts of the casing. The seal frames are tightly engaged with the two parts of the cylinder so that the two respective connection peripheries of the two parts do not need to be machined precisely.

1 . A cylinder  1  comprising: 
 a casing composed of two parts  12  and a piston  10  received between the two parts  12 , the piston  10  having a shaft  101  which extends out from the cylinder  1 , two seal frames  13  engaged with two respective insides of the two parts  12  and a packing  11  clamped between the two seal frame  13 , a seal portion  112  extending from an inner periphery of the packing  11  and being in contact with a top and a bottom of the piston  10 , a seal tongue  111  extending from the inner periphery of the packing  11  and in contact with two respective insides of the two parts  12 .    
     
     
         2 . The cylinder as claimed in  claim 1 , wherein the seal tongue  111  extends inclinedly outward from the inner periphery of the packing  11 .  
     
     
         3 . The cylinder as claimed in  claim 1 , wherein the seal tongue  111  is made by flexible material.