Ingenious New Nut-locking Device
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SPLIT pins, spring washers, tab washers, burred-up bolt-ends—all means fier preventing nuts from work
ing loose are claimed to be superseded by the Simmonds Elastic Stop Nut, a product of Sirnmond's Aerocessories, Ltd., Shell-Mex House, Strand, London, W.C.2.
The essence of this device is a ring of special fibre, housed in an annular groove formed above the threads in the nut, which is slightly increased in height to accommodate it.
Because of its elasticity, this fibre ring adapts itself to the shape of the thread when the nut is screwed home
on a bolt or Stud, and, in so doing, exerts an axial pressure which holds the faces of the threads on the belt and in the nut tightly in contact with each other.
On a 1-in. bolt this pressure is said to amount to 700 lb. and to prevent the nut from turning, through any form of vibration, whether it be tightly screwed home or not.
The fibre is claimed to conform to the thread shape without suffering damage and to make an airtight joint. It does not materially detract from the ease with which the nut can be screwed into position. A21