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US 11,300,116 B2Granted
Long-stroke rolling diaphragm cylinder and methods of making same
AssigneeRegents of the University of Minnesota
InventorsSaeed Hashemi, William Keith Durfee
Life of this patent
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Abstract
Hydraulic cylinders and methods of fabricating hydraulic cylinders, including long-stroke rolling diaphragm cylinders with any stroke length. In some embodiments, the cylinders are manufactured to have a stroke length to bore diameter (“stroke-to-bore”) ratio optionally greater than 1:1. Various embodiments are suitable for use in a passive hydraulic body-powered wearable robot, for example.
Claims14
A method of manufacturing a diaphragm comprising:
- providing a sheet of base material;
- securing the sheet of base material into a cylindrical configuration having a first end, a second end and defining a center axis;
- forming slits in the first end to form a plurality of flaps in the base material;
- folding the flaps in an overlapping fashion toward the center axis;
- securing the flaps in the overlapping fashion;
- applying an elastomer to the base material in a vacuum chamber;
- curing the elastomer;
- and
- applying an epoxy proximate the flaps.
6 more elements
Dependencies are inferred from the claim text.