METHOD FOR ADJUSTING DEPTH OF ROUND HAUL NET AND TOOL FOR DEPTH ADJUSTMENT

摘要

PROBLEM TO BE SOLVED: To adjust the depth for laying a round haul net by a buoyancy of optionally mounted buoyants depth-adjustable at the upper end of the round haul net. SOLUTION: This method for adjusting the depth of the round haul net is provided by linking a pressure-sensing tool capable of depth adjusting with a dial to an air valve, mounting an air cylinder at one side of the valve as freely demountable, and depth-adjustable buoyant bodies attached with air balloons at the upper end of the round haul net in the other side of it for adjusting the depth of the net.