Year: 1895

page_text: Date of Application, 29th Mar., 1895
Complete Specification Left, 30th Dec., 1895-Accepted, 1st Feb., 1896
I, HERBERT TOWNSEND, of 2 Albert Villas, Spruce Hill Road, Walthamstow,
in the County of Essex, Engineer, do hereby declare the nature of this invention
to be as follows:-
My invention relates to an improved lock nut, to make which I take an ordinary
hexagonal or other nut and I make in the top face thereof a transverse saw-cut of
suitable depth preferably about half the depth of the nut. I provide the bottom
face of the nut with a channel or groove extending diametrically across the nut in
the same direction as the saw-cut in the upper face. The width of the said groove
is preferably equal to or greater than the diameter of the bolt onto which the
nut fits. The action of my improved lock nut is as follows, that is to say, when
it begins to tighten against an opposing face the peculiar shape of the underside
of the lock nut causes the saw-cut to close slightly thus pressing the threads of
the upper part of the nut tightly against those of the bolt. This will cause the nut
to be effectually locked.
Dated this 29th day of March 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
I, HERBERT TOWNSEND, of 2 Albert Villas, Spruce Hill Road, Walthamstow,
in the County of Essex, Engineer, do hereby declare the nature of this invention,
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
My invention relates to an improved lock nut having in the upper or outer
part thereof a transverse saw cut of suitable depth preferably about half the depth
of the nut, and in the lower face of the nut a channel or groove extending
diametrically across the nut in the same direction as the aforesaid saw cut.
Referring to accompanying drawings,
Figure is a side view of a hexagonal nut constructed according to my
invention.
Figure 2 is a top plan, and
Figure 3 is a bottom plan of the same.
To make my improved lock nut I take an ordinary hexagonal or other nut A
and I form in the upper part thereof a transverse slit or saw cut B extending
entirely across the nut from the top surface preferably to about half the depth of
the nut. In the lower face of the nut 1 provide a curved or other shallow
channel or groove C extending diametrically across the said face and having the
same direction as the slit B. The radius of curvature of the said groove or
channel C may be conveniently equal to about twice the diameter of the bolt, and
the width of the said groove is preferably equal to or greater than the diameter of
the bolt on which the nut fits.

page_text: The action of my improved lock nut is as follows, that is to say, when it begins
to tighten against an opposing face the peculiar shape of the base of the lock nut
causes the nut to bend and the saw-cut to close slightly thus pressing the threads of
the upper part of the nut tightly against those of the bolt. This will cause the nut
to be effectually locked.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
A lock nut constructed with a transverse slit such as B in the upper part thereof,
and a channel or groove such as C in the lower face thereof, substantially as, and
for the purpose, specified.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.