Locking system for a semitrailer sliding undercarriage with air pressure protection valve

  • US 5,620,195 A
  • Filed: 05/01/1996
  • Issued: 04/15/1997
  • Est. Priority Date: 12/24/1992
  • Status: Expired due to Term
First Claim
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1. A locking system for mounting on a sliding undercarriage of a semitrailer, the semitrailer pulled by a tractor, the locking system used for securing and releasing the sliding undercarriage from a pair of parallel rails mounted on an underside of the semitrailer, the parallel rails having spaced apart locking pin holes along the length thereof, the sliding undercarriage having spring operated air brakes operated from a pressurized air source on the semitrailer or tractor, the semitrailer having an electrical power source thereto, the locking system comprising:

  • a locking pin;

    locking pin insertion and retraction means attached to said locking pin for inserting and retracting said locking pin in a selected locking pin hole in the parallel rails, said insertion and retraction means attached to the sliding undercarriage; and

    an air pressure protection means connected to said locking pin insertion and retraction means and connected directly to the pressurized air source on the semitrailer to prevent the depletion of air pressure in the pressurized air source in the operation of the semitrailer'"'"'s air brakes, said pressure protection means further preventing the operation of said locking pin insertion and retraction means when the pressurized air from the pressurized air source drops below a predetermined amount.

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