Patent ID: 7023340

Claim:
A membrane ( 1 ) for a cover ( 15 , 15 ′) for closing a container ( 14 , 14 ′) having the general form of a cylinder with a soft surface structure and being compressible in the direction of the axis of the cylinder, characterised in that it comprises two mutually parallel, generally flat parts ( 2 , 3 ) arranged at the upper and lower part of the membrane ( 1 ) respectively, arranged to move axially in relation to each other guided in said movement by means of guiding means ( 4 , 41 , 42 , 43 ), resilient means ( 6 , 6 ′) arranged to generate a counterforce between the flat parts ( 2 , 3 ) during compression of the membrane in the direction of the axis, at least a first and a second electrical contact device (G 1 , C 1 , C 1 ′) and (G 2 , C 2 , C 2 ′) operated by means of the axial movement between the circular parts ( 2 , 3 ), the combined electrical settings of which contact devices will carry information about the compressions and decompressions of the membrane, means for presenting said settings to the outside of the membrane.