Improvements in the Construction of Nuts.
Year: 1899

page_text: Date of Application, 10th Apr., 1899-Accepted, 13th May, 1899
Improvements in the Construction of Nuts.
I, CHARLES ARTHUR ALLISON, of 52, Chancery Lane, London, in the County of
Middlesex, Patent Agent, do hereby declare the nature of this invention (which
has been communicated to me from abroad by the National Elastic Nut Company,
located in the City of Milwaukee, in the County of Milwaukee, and State of
Wisconsin, United States of America) and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:—
This invention has for its object the construction of a split nut, and is an improve-
ment on the device described in Letters Patent Number 3945 of 1892, and to that
end, the present invention consists, primarily, in the formation of a nut-blank con-
sisting of a strip of metal having straight vertical ends, and integral extensions, the
inner edges of said extensions following the line of the longitudinal center of the
strip, and being united to the said straight ends on rounded lines, and, secondly,
in a nut formed from said blank, having a slit extending in vertical lines from the
top and bottom of the nut and from different points of the bore, through the nut
to points adjacent to the center, the vertical lines of the slit being united by
rounded lines merging into a lateral longitudinal line, whereby the nut will hold
its place upon a bolt without being locked against lateral expansion, all as is more
fully explained hereinafter, in connection with the accompanying drawings.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a perspective view, and Figure 2 is a side elevation, of my improved
nut, in its finished condition. Figure 3 is a view of the blank, and Figure 4 is a
view of the ring from which said finished nut is made.
The nut made under the prior patent above named formed a perfect lock, and by
reason of the dovetail union of the ends of the blank from which said nut was
made tended to prevent undue lateral spreading or opening of the nut when it was
screwed upon a bolt, and so far was satisfactory. In nuts of this class the bore
of the nut is tapped slightly smaller than the diameter of the bolt to which the
nut is to be applied, but it has been found in practice with the patented nut above
referred to, that the limit of yield enforced by the said dovetail union, together
with the fact that the parts of the nut at the line of separation must necessarily
ride upon each other obliquely, will usually result in end-wise pressure against the
threads of the bolt, as well as center contraction against the holt, and hence, while
the said patented nut will firmly hold in place when it has been applied, there is
frequently great difficulty in removing the nut from the bolt, and again applying
it thereto, owing to the injury to the threads of the bolt, and to remedy these
defects is the object of my present invention.
Referring to the drawings of my present case, I show, in Figure 3, the blank A.
from which my improved nut is made, said blank consisting of a strip of iron,
steel, or other suitable material, the central portion of which is of rectangular
farm, having an integral extension (marked a and b, respectively) at each end,
but instead of making the inner edges of said extensions on oblique lines extend-
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page_text: ing from a point below to a point above the longitudinal center of said strip, as in
said prior Patent Number 3945 of 1892, the inner edges of said extensions follow
the line of the longitudinal center of the strip, as shown at cc, and are united to
the straight vertical end portions dd, and ec, of said strip on rounded lines, as
shown at ff, and yy, in said Figure 3. The strip A. is then bent around into an
annular or ring form, as shown at B, in Figure 4, and with the end extensions a
and overlapping and with the rounded convex surfaces y fitting within the
rounded concave surfaces f f of the said strip. The ring B is then put into a die
of the proper shape (for example, one with a hexagonal opening) and pressed into
the required shape, after which the bore in the nut is tapped and the article is
complete. As will be seen by the dotted line in Figure 2, the slit in my finished
nut C cannot extend, as in the said prior patent, from the top of the nut to a point
below the horizontal center, and thence to a point above said center and down to the
bottom, and hence the dovetail lock of said prior nut is avoided and rendered
impossible, while retaining all of the meritorious features of said prior patented
nut, augmented by the advantages consequent upon the peculiarities of my
improved construction.
Proper bolts are made of standard sizes, and I have discovered that with
my Duts
made as herein before described, the nuts should be tapped with minus taps 1-128
undersize of the bolts for which they are intended, in order to give the best results.
When this is done, and the nut is applied, the nut at the line of the split will
open about 1-64 of an inch, and the tendency of the nut to close will hold it upon
the bolt with a constant grip, while at the same time this puts no extra strain
endwise of the bolt or against the threads (as did the lock nut made under said
prior patent) and hence my present nut can be repeatedly removed from, or replaced
on, its bolt, without wear or injury of the threads, and may even be readily applied
over rusted or battered screw-threads on a bolt which would prevent the use of
any other nut, or render it difficult if not impossible.
.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my said foreign correspondent, I declare that what I claim is:-
1. A nut-blank consisting of a strip of metal the ends of which are formed with
integral extensions, one parallel at its upper edge with the upper edge of said
strip, while the lower edge of the other extension is parallel with the lower edge
of said strip, the said strip and its extensions having straight ends, and the inner
edges of the said extensions following the line of the longitudinal center of the
strip, and being united to the said straight ends on rounded lines.
2. A nut provided with a slit extending in vertical lines from the top and bottom
of the nut, and from different points of the bore, through the nut to points adjacent
to the center, the vertical lines of the slit being united by rounded lines merging
into a lateral longitudinal line, whereby the nut will hold its place upon a bolt
without being locked against lateral expansion.
Natal this 10th love of Au
1000