Patent ID: 7536949

Claim:
Pressing cylinder for use in a refuse compressor for compression of refuse, the pressing cylinder being oriented vertically and coupled at a bottom portion to a pressing plate and at a top portion to a top plate fixed in a frame, comprising: means to activate the pressing plate in upward and downward directions of the pressing cylinder, a plurality of cylinder sections comprising a first and lowest cylinder section having a bottom portion fixed to the pressing plate, a second and intermediate cylinder section which is displaceable telescopically in a longitudinal direction in the first cylinder section, and a third and upper cylinder section, which at a top portion is attached to the top plate, the second and intermediate cylinder section is displaceable telescopically on the third and upper cylinder section, and the third and upper cylinder section is in the second and intermediate cylinder section the third cylinder section at a bottom portion comprising a bottom plate which together with the third cylinder section and the top member delimits a closed hollow space in the third cylinder section, an approximately cylinder-shaped bendable diaphragm disposed internally within the pressing cylinder between a bottom of the bottom plate and a bottom of the first cylinder section at the pressing plate, the bendable diaphragm having one end clamped to the bottom portion of the third and upper cylinder section and an opposing end clamped to the bottom portion of the first and lowest cylinder section an airtight space being created internally in the pressing cylinder between the bottom plate, the pressing plate and the diaphragm, the bottom plate comprising an inlet opening for a supplying a compression medium to the airtight space, means for supplying the compression medium comprising a pipe connected at one end to the inlet opening and at an opposite end to a three-way valve, which in a first position opens to a source of the compression medium, and in a second position opens the airspace to the atmosphere, and an extension spring clamped in the pressing cylinder between the bottom plate, the spring having one end clamped to the bottom plate and an opposing end connected to the pressing plate internally in the pressing cylinder and the pressing plate, which extension spring contracts the cylinder sections at the end of a working stroke.