IMPROVEMENTS IN THE CONSTRUCTION OR MANUFACTURE OF NUTS FOR SCREW-BOLTS FOR THE PURPOSE OF PREVENTING THE SAME WORKING LOOSE OR BECOMING UNSCREWED BY VIBRATION."
Year: 1882

page_text: LETTERS PATENT to Roland Harrington, of Wolverhampton, in the county
of Stafford, Engineer, for an Invention of "IMPROVEMENTS IN THE
CONSTRUCTION OR MANUFACTURE OF NUTS FOR SCREW-BOLTS FOR THE PURPOSE
OF PREVENTING THE SAME WORKING LOOSE OR BECOMING UNSCREWED BY
VIBRATION."
PROVISIONAL SPECIFICATION left by the said Roland Harrington at the
Office of the Commissioners of Patents on the 16th February 1882.
ROLAND HARRINGTON, of Wolverhampton, in the County of Stafford, Engineer.
"IMPROVEMENTS IN THE CONSTRUCTION OR MANUFACTURE OF NUTS FOR SCREW
BOLTS FOR THE PURPOSE OF PREVENTING THE SAME WORKING LOOSE OR BECOMING
UNSCREWED BY VIBRATION.”
This invention is designed to furnish a lock nut of a novel very simple and
inexpensive construction, in such a manner that it shall be prevented working
loose on a screw bolt by vibration, and will be found particularly applicable to the
bolts used for railway fish plates, machinery or other structures liable to
vibration.
In carrying it out I construct a nut by rolling or coiling a strip of spring steel,
steel wire or other suitable elastic material and of suitable shape into a spiral or
convoluted form.
Or I may construct it by pressing or stamping a washer of suitable shape from
a strip of spring steel or other suitable elastic material and cutting same completely
through one part of its circumference.
By pulling the two ends apart a nut consisting of one thread is formed. In
either case the pitch of the nut is preferably slightly finer or coarser than that of
the bolt on which it is required to be screwed.
In the first mentioned case, the nut may consist of one or more threads and in
either case, the inner circumference of the nut may be slightly smaller than the
diameter of the screw which it is desired to fit. Un screwing up these nuts on the
bolts the coils expand or contract gripping the bolt by their natural elasticity,
which prevents retractile motion. The peripheries of these nuts may be square,
round, or of other suitable form.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Roland Harrington in the Great Seal Patent Office on the
16th August 1882.
ROLAND HARRINGTON of Wolverhampton, in the County of Stafford, Engineer.
IMPROVEMENTS IN THE CONSTRUCTION OR MANUFACTURE OF NUTS FOR SCREW-
BOLTS FOR THE PURPOSE OF PREVENTING THE SAME WORKING LOOSE OR BECOMING
UNSCREWED BY VIBRATION.
My Invention relates to nuts of a simple and inexpensive construction, and has
for its object to prevent said nuts from working loose on the thread of the screw
bolt upon which they are placed.
To this end, the invention consists in constructing nuts by rolling, coiling or
otherwise forming them out of or from a strip or piece of spring steel, steel wire,
or other suitable elastic material of convenient shape, into a spiral or convolved
form. For this purpose I use strips of spring steel rolled or fashioned with a knife
or V edge on one (the inner) side, so that when the strip is coiled up, the knife
edges form the thread of the nut.
Sometimes I construct the nut by pressing or stamping a washer or blank ring
of suitable shape, having a knife or Vedge on its inner circumference, from or out
of a strip of spring steel or other suitable elastic material, and cutting the same
completely through one part of its circumferential border so that by pulling or
forcing apart the two ends formed by the cut, an elastic nut consisting of one
thread is formed.
In either case I make the pitch of the thread of the nut slightly finer or coarser
than that of the bolt on which it is to be screwed, the inner circumference of the
nut being preferably made slightly smaller than the circumference of the screw.
So that on screwing up these nuts, which may be made of any convenient depth
in one or more pieces, or consist of a series of single-threaded pieces, the coil
forming the nut will grip the bolt or screw to which it is applied. The outer
peripheries of the nuts may be squared or made into hexagons or any other form
for convenience of screwing up or adjustinent. The accompanying drawing will
serve to illustrate a convenient mode of performing the invention, like letters of
reference representing like parts.
Figure 1 is a perspective view of a knife-edged blank A ready for coiling.
Figure 2 is a perspective view of the same when coiled and formed into a nut.
Figure 3 is a perspective view of a washer or single-threaded nut D, B being the
cut above referred to.
Figure 4 is a cross section of the blank A.
Figure 5 is a cross section through the nut as shown in Figure 2.
Figure 6 is a cross section through Figure 3.
Having thus described my invention what I claim is
cut anove referred to.
Figure 4 is a cross section of the blank A.
Figure 5 is a cross section through the nut as shown in Figure 2.
Figure 6 is a cross section through Figure 3.
Having thus described my invention, what I claim is ….….
The improved mode of constructing elastic and gripping lock nuts by coiling
rolling or otherwise treating one or more pieces of material substantially in the
manner described and illustrated, and for the purpose set forth.
In witness whereof I the said Roland Harrington have hereunto set my hand
and seal this sixteenth day of August. A.D. 1882.