Year: 1887

page_text: JOHN JAMES CLARET of 10 Wilton Square New North Road London in the County
of Middlesex, Engineer, do hereby declare the nature of this invention to be as
follows:-
This improvements in screw nuts is as follows, an ordinary Nut is first forged square
or with any number of sides on the outside, and square or any number of sides on the
inside but conical. Into this nut I fit a second nut having any number of sides
but conical with a V or square thread cut on its inner side, I then place the last
mentioned nut inside the first mentioned nut and the two combined will form a secure
jam Nut.
I may also make the Nuts circular tapered on the inside of one and the outside of
the other to coincide with each others taper they may be made of any suitable material
the inner nut on which the thread is cut may be split so that it may clutch the Bolt
more tightly.
My object with this kind of lock nut is to avoid the great strain which is now
placed upon fish Plate Bolts on the Permanent Way of Railways and upon several
parts of machinery many of the appliances for effecting the desired lock nut being too
expensive, I may make the nuts of any cross section.

page_text: Improvements in Lock-nuts or Safety Screw Nuts.
I JOHN JAMES CLARET of 10 Wilton Square, New North Road in the County of
Middlesex, 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 :-.
This Improvement in Screw Nuts is as follows, an ordinary nut is first forged or
otherwise formed with four or more sides on the outside, that is to say of a square,
hexagon octagon or other approved form, the inside of the nut being formed in the
same manner with any required number of sides but conical or wedge shape; under
some circumstances I would prefer also that the interior of the large or outside
portion of the nut should be circular in cross section, the exterior of the inside nut
corresponding, whilst the inside of the smaller part of the nut will in all cases be
provided with a V or square screw thread of any desired and suitable pitch for
the purpose for which it may be intended, and to fit the screw bolt to which it
belongs.
I then place the last mentioned nut inside the larger one, and the two combined
will form a secure jamb or lock nut; when making use of lock nuts with round cones-
instead of square or other forms, with a view to preventing the same turning round
when the nut is being screwed up, I should prefer to make the inner nut with a
projection or a recess on one or more of its sides the outer nut being formed
correspondingly.
In order that my Invention may be better described and more readilly understood
I now refer to the Drawings annexed. Fig. 1 being a longitudinal elevation of a
screw bolt fitted with this lock nut, Figs. 2, 3 & 4 shew sections and plan of the
Improved Nut whole and in parts, Fig. 5 gives a longitudinal section of the bolt
represented in Fig. 1.
Figs. 6, 7, and 8, shew the nuts with the projection or recess already referred
to, which expedient needs only to be adopted when round conical inner nuts are
used.
This improved nut would be made in iron steel or other approved metal, alloy or
material according to the purpose intended.
The inner nut on which the thread is cut may be split so that it may grip or clutch
the bolt more tightly.
The length of the taper of the inner cone or the depth of the nut would be so
proportioned and of such length as to afford the necessary bite or grip when
screwing up.
My object with this kind of Lock Nut is to avoid the great strain which is now
placed upon fish-plate bolts on the permanent way of railways and on the various
working parts of high speed engines and machinery, a good, simple and reliable safety
nut for which is much needed, many of the expedients adopted for securing this result,
being too expensive and complex, and frequently unreliable.

page_text: Having now explained the nature of my said Invention, and the manner in which
the same is to be carried into effect I beg to state that what I claim is,―
A simple and reliable lock- or Safety-Nut made in two or more parts, the inner nut
being provided with a screw thread on its inner side to fit the bolt to which it belongs,
and the outside of the same being conical or taper and of any desired cross section,
the taper on both the inside and the outside portions of the nut being formed with the
same angle as herein illustrated and described.