Patent ID: 9617116
Date: 2017-04-11
CPC Classifications: B66B,G01G,G01L

Claim:
1. An elevator installation, comprising: an elevator cage; a support construction bearing the elevator cage, the support construction including first and second beams each having a horizontally extending beam surface; first and second sensors; respective material structures in each of the beam surfaces of the first and second beams, each of the material structures being bounded by a material separation formed in the respective beam surface, wherein the material separations are formed by at least partly removing or weakening a material of the first and second beams, the first sensor being arranged at the material structure at the first beam and the second sensor being arranged at the material structure at the second beam, a change in spacing at the material structure at the first beam being measurable by the first sensor, and a change in spacing at the material structure at the second beam being measurable by the second sensor, the first sensor detecting a compression of the first beam and the second sensor detecting an expansion of the second beam, wherein the first beam includes two of the material separations each generally in a shape of a capital letter “E” and the second beam includes two of the material separations each generally in a shape of a capital letter “M”.