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    • 4. 发明专利
    • NET BAG FOR FOOT PROTECTION
    • JPH1150428A
    • 1999-02-23
    • JP22313597
    • 1997-08-05
    • SENI DOBOKU KAIHATSU KKTOYO BOSEKIDAIKA SANGYO KKTOMEN KK
    • SASAKI SHIRONISHIDA TAKASHIKASAI SHIRONUMATA TADASHI
    • E02B3/08
    • PROBLEM TO BE SOLVED: To increase the strength of the nearby position of the bottom of a net and regulate the stacked height, by turning back two edge sides oppositely arranged at the bottom of a bag that a net formed with synthetic resin threads is sewed cylindrically, so that the edges are superposed with each other at the center of the bottom, and integrally sewing them to form a multiple bottom. SOLUTION: A double-structural net of net cloth made of twisted threads of long nylon fiber is cylindrically sewed together to form a bag body 1 with the bottom. And two edge sides 3, 4 oppositely positioned at the bottom are turned back so as to superpose the end edges 6, 7 at the bottom center and integrally sew them and constitute a multiple bottom 8. The bottom 2 is placed falt to turn back and form the turning-back part of the two edge sides 3, 4 and three net cloths are superposed in the zones 3, 4 and double net cloths are superposed in the zones 11, 12, in the multiple bottom 8. Crushed stones or the like are contained in the bag body 1. Since the multiple bottom 8 occupies the half of the lower external periphery and the bottom external periphery on which the largest load acts when it is hung, the danger of breakage is reduced by half. And hence, the strength of the nearby position of the bottom of the net is increased and the stacked height of crushed stones can be regulated.