Patent ID: 8499423
Filing Date: 2013-08-06
Classification: F16B,Y10T

Abstract:
1. A precision safety ring-shaped hook, comprising: a hook body having a hook cavity penetrating through two sides thereof, an opening communicating said hook cavity, a first guiding member provided at one end thereof, and a second guiding member provided at another end thereof, wherein said first guiding member is constructed to narrow a width of said opening and has an open slot formed in an inner side surface thereof and a locking slot extended from one end of said open slot; a locking member comprising a main wall and two side walls forming a U-shaped frame, said main wall having a first end and a second end, said two side walls having a first ear portion adapted for slidably moving about said first guiding member in a restricted manner and a second ear portion adapted for slidably moving about said second guiding member in a restricted manner, said first ear portion providing a first locking axle adapted for switching a position thereof between said open slot and said locking slot, said second ear portion providing a second locking axle adapted for coupling with said second guiding member; a first spring providing a momentum to drive said locking member to monentarily shut said opening; a timing gauge structure comprising two rail members and a block pin and having a sliding groove, said rail member being correspondingly provided between said second guiding member and said second ear portion and having an arc surface, said sliding groove penetrating through said second guiding member so as to couple with said second locking axle for slidably moving with respect to said locking member in a restricted manner, so that when said first locking axle is retained in said locking slot to shut said opening of said hook body, said first end of said main wall is biased against an outer surface of said first guiding member and, at the same time, said block pin is moved away from said arc surface, wherein when said first locking axle is moved to said open slot, said first end of said main wall is moved away said first guiding member and, at the same time, said block pin is moved to said arc surface, so that when said first locking axle is swung into said hook cavity, said block pin is moved to said arc surface and thus said locking member is guided by said arc surface to open said opening of said hook body.