Frequency adapter and return means suitable for being arranged in such a frequency adapter

Abstract

A frequency adapter ( 1 ) having at least first and second cylinders ( 11, 12 ) having respective elongate first and second side walls ( 13, 14 ), the second cylinder ( 12 ) being surrounded at least in part by the first cylinder ( 11 ), resilient return means ( 20 ) being in contact with the first and second side walls ( 13, 14 ). Said return means ( 20 ) comprise resilient first and second extreme layers ( 21, 22 ) each in contact with the first and second side walls ( 13, 14 ), said adapter ( 1 ) being provided with a fluid ( 30 ) arranged in a single chamber ( 100 ) between said first and second extreme layers ( 21, 22 ).

What is claimed is: 
     
         1 . A frequency adapter comprising: at least first and second cylinders having respective elongate first and second side walls, the second cylinder being surrounded at least in part by the first cylinder, and with resilient return means in contact with the first and second side walls so as to be capable of being stressed by the first cylinder and the second cylinder, wherein said return means comprise first and second resilient extreme layers each in contact with the first and second side walls, said adapter being provided with a fluid arranged in a single chamber between said first and second extreme layers so as to be suitable for escaping from the adapter in the event of at least one extreme layer presenting a crack that requires said adapter to be replaced. 
     
     
         2 . A frequency adapter according to  claim 1 , wherein said fluid is a liquid or a gas. 
     
     
         3 . A frequency adapter according to  claim 1 , including a pressure sensor for sensing the pressure of said fluid. 
     
     
         4 . A frequency adapter according to  claim 1 , wherein said first cylinder is blind having a first side wall extending longitudinally from a first base that is open to an external medium (EXT) to a second base that is closed by a plug, said first extreme layer of the return means facing said external medium (EXT) and said second extreme layer of the return means facing said plug, a first longitudinal dimension (DIM 1 ) of said first extreme layer being shorter than a second longitudinal dimension (DIM 2 ) of said second extreme layer. 
     
     
         5 . A frequency adapter according to  claim 1 , wherein said return means include an intermediate layer between said first and second extreme layers, said intermediate layer including a cavity constituting said single chamber in which said fluid is located. 
     
     
         6 . A frequency adapter according to  claim 5 , wherein said intermediate layer has a resilient first ring secured to the first and second extreme layers and in contact with the first cylinder, said intermediate layer also having a resilient second ring secured to the first and second extreme layers and in contact with the second cylinder, said cavity having the shape of a central ring and extending between the first and second extreme layers and between said first and second rings. 
     
     
         7 . A frequency adapter according to  claim 1 , wherein the return means is arranged between the first and second cylinders the return means having a single block of material provided with first and second extreme layers spaced apart by an intermediate layer, said intermediate layer including a cavity filled with a fluid.