Patent ID: 6262665
Filing Date: 2001-07-17
Classification: G08B

Abstract:
A four-states warning switch, comprising:a. a hollow housing, said housing electrically connected to a first electric circuit and a separate, second electric circuit;b. a hollow actuating cylinder element enclosed inside said housing and pivoted to said housing by a pivot pin from one end, said actuating cylinder element enclosing:i. a piston having two parts, an inside part and an extension of a smaller diameter extending outside said actuating cylinder element, movable only leftwards, guided by a groove in the inner surface of said housing,ii. an activated only when pressed first push-button switch, electrically connected to said first electric circuit,iii. a rod, fixed to said inside part of said piston, with tip of said rod facing said first push-button switch so as to press said first push-button switch when said piston moves inwards,iv. a bar fixed to said piston extension, and extending outside said housing, guided by a slot in said housing for rightward and leftward movement with said slot having same center line of said groove,v. a compression spring, fitted between said inside part of said piston and said first push-button switch,c. a protrusion on outer surface of said actuating cylinder element,d. a handle fixed to said bar,e. an activated only when pressed second push-button switch, electrically connected to said second electric circuit, fixed to inner surface of said housing , having a side ""U"" shape opening wherein said bar fits smoothly on reaching the right end of said slot on pressing said handle and shifting said actuating cylinder element rightwards so as to activate said second push-button switch by said piston extension,f. an activated only when pressed third push-button switch, electrically connected to said second electric circuit and connected in parallel to said second push-button switch, fixed to inner surface of said housing thereat a spot facing said protrusion of said actuating cylinder element so as to activate it by shifting said actuating cylinder element leftwards until said protrusion presses said third push-button switch.