Lamrig spring-lock washers

Lamrig (Lambie and Wrigleys patent 1910) spring-lock washers galvanised by electrodeposition viz:- 1 - 1 1/4" diam; and 1 - 1/4" diam.

These are washers designed to prevent nuts slacking back under vibration. They are made by the method patented in 1910 by Mr. J. M. Lambie, Mr. C. R. Wrigley, and Mr. J. Lambie. The blank is first sheared circumferentially in two places, thereby stretching the metal. The resulting segments are then sheared radially, thus forming when bent four tongues, the sharp edges of which tend to bite and prevent rotation of the nut. The washers are of spring steel hardened in oil, and can be used repeatedly. A number of sizes from 0.25 in. to 1.25 in. diam. galvanised by electro deposition are shown, but black washers are obtainable.