FIELD: transport.
SUBSTANCE: invention relates to lifting-and-conveying machines, particularly to safety devices of jib cranes. Proposed limiter comprises casing rigidly fixed on crane bearing structure or on jib head bracket. Said casing accommodates limit switch used to control gripper drive and limit switch drive whereto control weight is suspended on flexible element to interact with stop-pusher fitted on gripper. Drive is made up of spring-loaded plate with drive rod to allow identical action on limit switch irrespective of flexible element angular position with respect to drive. Said limiter can incorporate radio transmitter for wireless transmission of data on limit switch state to gripper drive control device. Limit switch can be secured on control weight or gripper, and cab be made up of electromechanical switch, inductive contactless limit switch, Hall transducer electronic switch or transponder reader using FRID performances.
EFFECT: longer life an higher reliability, expanded applications.
17 cl, 2 dwg
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