Expander with degressive stress behaviour

Abstract

An expander for training muscles, especially fast-acting muscle fibers, having an elastic element that can expand against its restoring force for the purpose of training, as well as a method for manufacturing such an expander. The elastic element consists of a composite of at least two different elastic materials, with a first elastic material being instantiated as a closed line pattern with an offset or non-offset four-fold or with a sixfold unit cell, with the closed line pattern being instantiated as boundary lines of the tiles of a tiling pattern, and with another elastic material filling out the surfaces of the tiles. The structure of the elastic element results in stress-strain diagrams with different gradients in different extension sections that are flatter in the working range and can be used advantageously for training explosive strength and speed.

Dependencies are inferred from the claim text.