A SIMPLE DESIGN OF LOCKNUT.
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rivIE loss of nuts is one of the corn..L men causes of failure in any type of mechanism, and even looseness may result in a breakdown. It is essential, therefore, when aiming at efficient maintenance, to prevent nuts from turning on their bolts owing to the influence of vibration;
The Evertite nnt, marketed by Everthe Locknnts, Ltd., St. Margaret's Ilovse, 57-59, Victoria Street, Westminster, London, S.W.1, is designed to counter the effects of vibration. As will be seen from the sectional drawing reproduced on this page, there is no complication in the way of additional parts. One end of the nut is bevelled ; this makes contact with the surface of the object held. Inside the nut, about two or three threads above the lower face, is an annular groove.
When the nut is tightened with a spanner the pressure on the bevelled face forces the lower part of the nut nearer to the upper portion' closing slightly the annular groove. In addition, the threads below the groove C7ose in and grip the bolt. Release is effected by a spanner without injury to the bolt, so that both nut and bolt may be used
repeatedly. Each nut is a one-piece job. Evertites are made in various sizes.