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AERIAL PERSONNEL PLATFORM WITH PROXIMITY SENSING SYSTEM

  • US 3,670,849 A
  • Filed: 10/23/1970
  • Issued: 06/20/1972
  • Est. Priority Date: 10/23/1970
  • Status: Expired due to Term
First Claim
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1. In mobile aerial platform apparatus having a movable boom structure, power means for moving the boom structure, and control means for controlling the power means;

  • a worker'"'"''"'"'s platform supported on an end of the boom structure to be moved by operation of the power means to elevated positions adjacent a body to be worked upon, the worker'"'"''"'"'s platform having frame portions defining a structure for occupancy by the worker, a protective bumper structure supported on the frame portions of the platform and projecting outwardly therefrom in protective relation to be engaged and resiliently deformed by the body during relatively approaching movement of the body and platform, said bumper structure comprising resilient inflated pneumatic tubing inflated to selected pressure and protruding outwardly beyond the frame portions of the platform, air pressure activated switch means exposed to the air pressure conditions in said pneumatic tubing and coupled to said control means for activating the control means to disable said power means when the air pressure in said tubing exceeds the selected value upon deformation of the tubing by contact with said body, said inflated pneumatic tubing including a first resilient pneumatic inflated tube forming a bladder protruding horizontally outwardly from said frame portions of the platform and a second pneumatic inflated tube extending vertically downwardly from frame portions of the platform about the perimeter thereof, and means pneumatically coupling said first and second tubes with said air pressure activated switch means for activating said switch means whenever the air pressure in either of said tubes exceeds said selected value.

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