730 



SAFETY APPARATUS 



the ring c, but the projections, x, K, of the clamp coming into contact with the bottom 

 flange of the said ring hold the clamp stationary, while the jaws are being pulled 

 through, the result being that the pins, 1 1, are sheared off, and the jaw hooks released 

 from the restraint of the clamp. The internal diameter of the ring being the same as 



1735 



1736 



1737 



the width across the jaw hooks, P, F, the 

 rope remains secure, until the jaw hooks 

 reach the top of the ring, when, by the action 

 of the weight of the load, they are forced 

 open, and so hook on to the top of the sup- 

 porting ring c, as shown in Jig. 1735, the rope passing harmlessly over the pulley. 



The recess o, in the ring c, is intended to meet an imaginary case that experiment 



shows to be almost impossible, namely, that if the engine is reversed after the pins i, i, 



are cut, and before the hooks reach the top of the ring, the jaws will then hook into 



the recess, and the load remain suspended in perfect safety. 



It will be observed that the upper edge of the ring c is curved to match the sweep 



1733 



of the jaw hooks when opening. By this 

 arrangement all shock is avoided. 



King's Safety Apparatus will be per- 

 fectly understood from the accompanying 

 figures. 



Fig. 1738 is a plan showing plate fixed 

 on top side of beams, which must be of 

 good strong oak, strong enough to hold 

 three times the weight it has to carry; 

 the two pieces of timber to be as far 

 apart as the ring is wide ; the plate to be 

 strongly bolted with four pins. 

 Figs. 1736 and 1737 show the inside of plates when in work ; c c, when drawn up to 

 the plate, are compressed, which forces D D out on the opposite side, and opens the jaws 

 of B E, which releases top shackle and leaves n B secure on the top side of plate. A is 



