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Pressure-Operated Farm Gate
Aircraft engineer Theo Stubbe invented this first-of-its-kind pressure-operated mechanism for opening farm gates.
  A "wire rope" runs from the gate post to a sunken pressure pad. The wheel of a vehicle or a person walking puts pressure on the pad, activating a mechanism in the post that rotates a lever at the top of the post, opening the gate. Once open, a solar-powered electromagnet holds the gate open for an adjustable amount of time before turning off and allowing the gate to slowly close.
  Contact: FARM SHOW Followup, Theo Stubbe, Bay of Islands, New Zealand (ph 64 9 403 7877).

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2001 - Volume #25, Issue #5