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They are used worldwide, in every type of environmental condition. It is a safety device and therefore must be failsafe and extremely rugged. Previously, the switch was rigidly mounted to the crane boom tip. Depending on the angle of the sensing cable and cast-steel weight relative to the switch body misalignment would occur and could potentially hinder the function of the switch. A switch with a metal or Teflon-coated bearing was too costly and required too much maintenance. The new design uses shoulder bolts as shafts and permits two degrees of rotational freedom to the assembly. Regardless of the angle of the crane boom, the sensing cable of the switch always pulls straight through the switch body with no opportunity for misalignment. |
“Igus bearings permit maintenance-free operation – no need for greasing, and long life – at a low cost, and they operate in all the environmental conditions that our switches operate in. It’s a perfect match.” |