Hose coupling fitting and fixing structure of hose coupling fitting and hose

Abstract

A hose coupling according to the present invention for securing a hose has a cylindrical nipple and a cylindrical socket disposed radially outwardly thereof. A plurality of circumferentially extending annular hose gripping projections are provided on a radially inner surface of the socket in a predetermined interval along a longitudinal direction of the nipple. The hose comprises an elastic tube layer and a reinforcing layer disposed radially outwardly thereof, and is to be secured between the nipple and the socket by crimping the socket after the hose is inserted between the nipple and the socket. At least one hose gripping projection of the plurality of hose gripping projections protrudes radially inwardly of the socket greater than other hose gripping projections.

1 . A hose coupling having a cylindrical nipple and a cylindrical socket disposed radially outwardly thereof, a plurality of circumferentially extending annular hose gripping projections being provided on a radially inner surface of the socket in a predetermined interval along a longitudinal direction of the nipple, a hose which comprises an elastic tube layer and a reinforcing layer disposed radially outwardly thereof being to be secured between said nipple and said socket by crimping said socket after the hose is inserted between said nipple and said socket, 
 wherein at least one hose gripping projection of said plurality of hose gripping projections protrudes radially inwardly of said socket greater than other hose gripping projections.    
   
   
       2 . A hose coupling according to  claim 1 , wherein said at least one hose gripping projection has a projection height such that, when said hose is secured by crimping between said nipple and said socket, said elastic tube layer is compressed at a compression rate of 55% or more.  
   
   
       3 . A hose coupling according to  claim 2 , wherein said at least one hose gripping projection has a projection height which enables said elastic tube layer to be compressed at a compression rate 10% greater than that of the part of said elastic tube layer which is compressed by a part of the radially inner surface of said socket adjacent to said at least one hose gripping projection.  
   
   
       4 . A hose coupling according to  claim 1 , wherein said at least one hose gripping projection includes a hose gripping projection nearest to the hose anti-insertion side.  
   
   
       5 . A hose coupling having a cylindrical nipple and a cylindrical socket disposed radially outwardly thereof, a hose which comprises an elastic tube layer and a reinforcing layer disposed radially outwardly thereof being to be secured between said nipple and said socket by crimping said socket after the hose is inserted between said nipple and said socket, 
 wherein a circumferentially extending annular hose gripping projection is provided on a radially inner surface of the socket, the hose gripping projection having a projection height which enables said elastic tube layer to be compressed at a compression rate of 55% or more, when said hose has been secured by crimping between said nipple and said socket.    
   
   
       6 . A hose coupling according to  claim 5 , wherein said hose gripping projection has a projection height which enables said elastic tube layer to be compressed at a compression rate 10% greater than that of the part of the elastic tube layer which is compressed by a part of the radially inner surface of said socket adjacent to the hose gripping projection.  
   
   
       7 . A hose coupling having a cylindrical nipple and a cylindrical socket disposed radially outwardly thereof, a plurality of circumferentially extending annular hose gripping projections being provided on a radially inner surface of the socket in a predetermined interval along a longitudinal direction of the nipple, a hose which comprises an elastic tube layer and a reinforcing layer disposed radially outwardly thereof being to be secured between said nipple and said socket by crimping said socket after the hose is inserted between said nipple and said socket, wherein at least one circumferentially extending projection is provided on a radially outer surface of said nipple.  
   
   
       8 . A hose coupling according to  claim 7 , therein said at least one projection has a projection height which enables said elastic tube layer to be compressed at a compression rate of 55% or more, when said hose has been secured by crimping between said nipple and said socket.  
   
   
       9 . A hose coupling according to  claim 8 , wherein said at least one projection has a projection height which enables said elastic tube layer to be compressed at a compression rate 10% greater than that of the part of the elastic tube layer which is compressed by a part of the radially inner surface of said socket adjacent to said at least one projection.  
   
   
       10 . A hose coupling having a cylindrical nipple and a cylindrical socket disposed radially outwardly thereof, a hose which comprises an elastic tube layer and a reinforcing layer disposed radially outwardly thereof being to be secured between said nipple and said socket by crimping said socket after the hose is inserted between said nipple and said socket, 
 wherein at least one circumferentially extending projection is provided on a radially outer surface of said nipple, said at least one projection having a projection height which enables said elastic tube layer to be compressed at a compression rate of 55% or more, when said hose has been secured by crimping between said nipple and said socket.    
   
   
       11 . A hose coupling according to  claim 10 , wherein said at least one projection has a projection height which enables said elastic tube layer to be compressed at a compression rate 10% greater than that of the part of the elastic tube layer which is compressed by a part of the radially inner surface of said socket adjacent to said at least one projection.  
   
   
       12 . A hose coupling and hose attachment construction having a hose coupling comprising a cylindrical nipple and a cylindrical socket disposed radially outwardly thereof, and a hose comprising an elastic tube layer and a reinforcing layer disposed radially outwardly thereof, a plurality of circumferentially extending annular hose gripping projections being provided on a radially inner surface of the socket in a predetermined interval along a longitudinal direction of the nipple, said hose being secured to the hose coupling by crimping said socket after the hose is inserted between said nipple and said socket, 
 wherein at least one hose gripping projection of said plurality of hose gripping projections protrudes greater into the hose than other hose gripping projections.    
   
   
       13 . A hose coupling and hose attachment construction according to  claim 12 , wherein said at least one hose gripping projection protrudes into said hose so that said elastic tube layer is compressed at a compression rate of 55% or more.  
   
   
       14 . A hose coupling and hose attachment construction according to  claim 13 , wherein said at least one hose gripping projection protrudes into said hose so that said elastic tube layer is compressed at a compression rate 10% greater than that of the part of the elastic tube layer which is compressed by a part of the radially inner surface of said socket adjacent to said at least one hose gripping projection.  
   
   
       15 . A hose coupling and hose attachment construction according to  claim 12 , wherein said at least one hose gripping projection is a hose gripping projection nearest to the hose anti-insertion side.  
   
   
       16 . A hose coupling and hose attachment construction having a hose coupling comprising a cylindrical nipple and a cylindrical socket disposed radially outwardly thereof, and a hose comprising an elastic tube layer and a reinforcing layer disposed radially outwardly thereof, a circumferentially extending annular hose gripping projection being provided on a radially inner surface of the socket, said hose being secured to the hose coupling by crimping said socket after the hose is inserted between said nipple and said socket, 
 wherein said hose gripping projection protrudes into said hose so that said elastic tube layer is compressed at a compression rate of 55% or more.    
   
   
       17 . A hose coupling and hose attachment construction according to  claim 16 , wherein said hose gripping projection protrudes into said hose so that said elastic tube layer is compressed at a compression rate 10% greater than that of the part of the elastic tube layer which is compressed by a part of the radially inner surface of said socket adjacent to said hose gripping projection.  
   
   
       18 . A hose coupling according to  claim 2 , wherein said at least one hose gripping projection includes a hose gripping projection nearest to the hose anti-insertion side.  
   
   
       19 . A hose coupling according to  claim 3 , wherein said at least one hose gripping projection includes a hose gripping projection nearest to the hose anti-insertion side.  
   
   
       20 . A hose coupling and hose attachment construction according to  claim 13 , wherein said at least one hose gripping projection is a hose gripping projection nearest to the hose anti-insertion side.  
   
   
       21 . A hose coupling and hose attachment construction according to  claim 14 , wherein said at least one hose gripping projection is a hose gripping projection nearest to the hose anti-insertion side.