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Mechanism for stopping the drive or reversing the drive of motors of roller shutter doors

  • US 4,342,354 A
  • Filed: 06/27/1980
  • Issued: 08/03/1982
  • Est. Priority Date: 07/04/1979
  • Status: Expired due to Term
First Claim
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1. A roller shutter door with limit switch sensing means comprising:

  • (a) a door curtain;

    (b) drum means upon which the door curtain is to be wound, the upper portion of the curtain being secured to the drum means;

    (c) an internal ring gear mounted with its central longitudinal axis in line with the central longitudinal axis of said drum means and attached thereto;

    (d) a reversible electric motor means having a pinion gear drivably connected therewith and arranged to mesh with said ring gear whereby to drive said drum to wind the curtain on and off the drum for closing and opening the door respectively;

    (e) a gear train drivably connected with said ring gear and including an elongate screw thread, the longitudinal axis of which extends substantially perpendicular with the central longitudinal axis of said drum means and immediately adjacent said ring gear and between the circumferential edge surfaces thereof;

    (f) a carriage, said carriage being threaded on said screw thread and restrained from rotating with said screw thread but being able to be advanced or retreated along said screw thread as said screw thread is rotationally driven by said gear train, said carriage having two end flanges spaced apart in a direction substantially parallel with the longitudinal axis of said screw thread;

    (g) limit switch means supported between said flanges, and;

    (h) respective screw thread limit stop adjusting means carried by each of said flanges whereby the limit switch means can be activated by said respective screw thread limit stop adjusting means when the door curtain is at the fully closed or fully open positions to switch off said reversible electric motor means.

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