Diaphragm bellows produced from profiled metal strip
AssigneeWestfalia Metallschlauchtechnik GmbH & Co. KG
InventorsMatthias Weiss, Karl-Heinz Münker, Dietmar Baumhoff, Andreas Gerhard, Karsten Schenk, Michael Henkelmann, Oliver Selter, Stefan Hauk
Life of this patent
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Abstract
A profiled metal strip for a diaphragm bellows is made from a strip material having at least one border which is subjected to reverse bending. Such a metal strip is wound to produce a diaphragm bellows, with abutting borders of neighboring turns being connected with one another by a material joint, such as a welding seam.
Claims20
A diaphragm bellows having a winding axis, comprising at least one wound pre-profiled metal strip made from a strip material and having neighboring turns which are connected, at least in one area at their borders, wherein at least one border of the strip material of the metal strip is subjected to reverse bending by turning the strip material by an angle of about 180 degrees and to include one contact web and one reverse web which are in abutment with each other and thereby provide doubling of the strip material, and wherein the borders of the neighboring turns do not overlap in the axial direction of the winding axis, each said border of the neighboring turns includes said contact web and said reverse web, and an abutment exists between the contact webs of the neighboring turns, or an abutment exists between the contact web of one of the neighboring turns and the reverse web of another one of the neighboring turns, via which the neighboring turns are connected with one another.
A method of making a diaphragm bellows having a winding axis, comprising the steps of:
- producing at least one pre-profiled metal strip from a strip material with at least one border which is subjected to reverse bending by turning the strip material by an angle of about 180 degrees so that the at least one border includes one contact web and one reverse web and thereby doubles the strip material, and wherein the borders of neighboring turns do not overlap;
- winding the metal strip to produce a spiral-shaped structure thereby forming the neighboring turns;
- and joining the borders of the neighboring turns of the structure so that they do not overlap each other in an axial direction of the winding axis and each said border of the neighboring turns includes said contact web and said reverse web, and an abutment exists between the contact webs of the neighboring turns, or an abutment exists between the contact web of one of the neighboring turns and the reverse web of another one of the neighboring turns, via which the neighboring turns are connected with one another.
Dependencies are inferred from the claim text.