Patent ID: 9216499
Filing Date: 2015-12-22
Classification: B25B,Y10T

Abstract:
1. A pulling structure comprising: a holding disc, an adjusting member, a screw rod set, and a plurality of pulling hooks; the holding disc including a threaded orifice defined on a central position thereof so as to insert the screw rod set, and the threaded orifice having a wide screwing section formed around an upper side thereof and a narrow screwing section arranged around a lower side thereof, the holding disc also including plural connecting portions disposed on a peripheral side thereof so as to connect with the plurality of pulling hooks; the screw rod set including an inner screw rod, an outer screw rod, and a hollow screw sleeve, wherein the inner screw rod is solid and is inserted through the narrow screwing section of the threaded orifice, and the outer screw rod is hollow and is fitted with an outer peripheral side of the inner screw rod, a bottom end of the outer screw is screwed with the wide screwing section, and the screw sleeve is screwed with the outer peripheral side of the outer screw rod; the adjusting member fitted in the outer screw rod and defined between the screw sleeve and the holding disc, and a spring element abutting against the adjusting member and the holding disc; the adjusting member including a plurality of coupling posts mounted on a peripheral side thereof, and each pulling hook having an inclined guiding face defined on a top end thereof so as to fit each coupling post.