DRIVES AND CONTROLS 



237 



TRIGGER SWITCH MOUNTINGS 



Switch- Posi+ion 

 ndicafor 



Top View with 

 Cover Removed 



Fig. 486. — Trigger-operated ratchet-type single-pole switch, a design no longer in general use. An arrow 

 stamped on the end of the shaft shows through a hole in the cover plate to indicate the position of the switch. Spring 

 blades pressing on the faces of the square contact block give a snap action and hold the block in position. 



Snap lever spring^ Snap lever fo give ,Slalionary 



quick break action/ / confach 



Pawl ' 

 spring 



Ralchel operoled drum 

 Pawl ptvoled on trigger 



Fig. 487. — Ratchet-type switch with double pole for three phase. Can also be used for single phase. The word 

 "on" is stamped on diametrically opposite points on the ratchet wheel. With switch in "on" position, the word 

 shows through a hole in the cover plate. A spring lever snaps into the star wheel, giving quick snap action. To open 

 the switch, a definite movement of the trigger is required. 



