| 摘要 |
Flip-up and down glasses including a first frame having ear pieces for the support thereof on a wearer of the first frame and a second frame for carrying a visor or optical glasses and a flip-up and down spring-loaded cam-hinge mechanism for the second frame comprising a horizontally extending hollow sleeve, a shaft extending through the sleeve and axially secured to the first frame, a first cam having cam surfaces supported and spring-loaded for horizontal movement within the sleeve and a second cam horizontally secured on the shaft and including cam surfaces for riding on and over the cam surfaces of the horizontally moveable spring-loaded first cam to define flip-up and down positions for the second frame secured to either the second cam or to the sleeve. |
