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Compact pulling apparatus

  • US 8,453,769 B2
  • Filed: 10/12/2012
  • Issued: 06/04/2013
  • Est. Priority Date: 04/15/2010
  • Status: Active Grant
First Claim
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1. A compact pulling apparatus including:

  • a watertight elongate housing extending along a longitudinal axis and defining an inner chamber, the housing including a top wall and a bottom wall;

    a track disposed around the housing along its longitudinal axis and enabling the apparatus to move when the track is rotatably driven around the housing;

    a track-driving motor, the motor being located within the inner chamber of the housing and including an output shaft mechanically connected to the track; and

    a ventilation circuit for the inner chamber of the housing, the ventilation circuit including an air inlet and an air outlet which communicate with the exterior of the housing, the ventilation circuit allowing the interior of the inner chamber to be kept above the freezing point when the outside temperature is lower and allowing the inner chamber of the housing to be cooled when the outside temperature is above an upper threshold.

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