Year: 1886

page_text: Date of Application, 1st Apr., 1886.
Complete Left, 31st Dec., 1886.
Complete Accepted, 1st Feb., 1887.
I, JAMES SCATTERGOOD of Stour Valley Nut & Bolt Works West Bromwich in
the County of Stafford, Manager do hereby declare the nature of this invention to be
as follows:-
My invention relates to the manufacture of lock nuts that is to say nuts such that
when they are screwed on their bolts they shall not be liable to become loosened by
vibration. I make the nuts for this purpose with their screwed holes for part of their
depth of such a diameter as to fit the bolts to which they are applied, and for the rest
of their depth tapering to a smaller diameter, the sides of the hole being at the tapered
part divided by a cross cut or by several cross cuts such as will permit the nut to
expand. In manufacturing such nuts which may be punched a little taper, I first cut
the threads in them with a tap a little smaller in diameter than the bolts for which the
nuts are intended. I then cross cut the nuts for part of their depth and finally by
means of a tap, which has part of its length tapered and part of uniform diameter I
clear out the burr raised by the cross cutting and at the same time enlarge the
diameter of that part of the hole which is not cross cut to the finished size fitting the
bolt. The two taps above mentioned may be in one piece, that is to say it may be a
long tap having its front part of the smaller diameter, its middle part tapered and its
rear part of the larger diameter. This tap I first run into the nut as far as the rear
of its tapered part, I then take it out and after cross cutting the nut I run the tap in
farther so as to form in the nut, the front part tapered where it is cross cut, and the
back part of uniform diameter. In screwing this nut on a bolt, the bolt enters freely
the larger end of the hole and then, as it advances through the tapered part, it expands
it, and the elasticity of the metal of the nut thus expanded gives a grip on the bolt
which prevents it from becoming loosened by vibration..
ABEL & IMRAY,
28, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: An Improvement in the Manufacture of Lock-nuts.
I, JAMES SCATTERGOOD, of Stour Valley Nut and Bolt Works, West Bromwich in
the County of Stafford, Manager, 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 invention relates to the manufacture of Lock-Nuts, that is to say Nuts, such
that when they are screwed on their bolts they shall not be liable to become loosened
by vibration. I make the nuts for this purpose with their screwed holes for part of
their depth of such a diameter as to fit the bolts to which they are applied and for the
rest of their depth tapering to a smaller diameter, the sides of the hole being at the
tapered part divided by a cross cut or by several cross cuts such as will permit the nut
to expand.
In manufacturing such nuts, I prefer to first cut the threads in them with a tap a
little smaller in diameter than the bolts for which the nuts are intended; I then cross
cut the nuts for part of their depth and finally by means of a tap, which has part of
its length tapered and part of uniform diameter. I clear out the burr raised by the
cross cutting and at the same time enlarge the diameter of that part of the hole which
is not cross cut to the finished size fitting the bolt. The two taps above mentioned
may be in one piece, that is to say, it may be a long tap having its front part of the
smaller diameter, its middle part tapered and its rear part of the larger diameter.
This tap I first run into the nut as far as the rear of its tapered part, I then take it
out and, after cross cutting the nut, I run the tap in farther so as to form in the nut,
the front part fapered where it is cross cut, and the back part of uniform diameter.
Obviously the blank nut might first be cross cut and then tapped. In screwing this
nut on a bolt that part of the nut which is of the same diameter as the bolt itself
screws on to it, and then, as the nut advances upon the bolt, that part of the nut
which is tapped taper screws on to the bolt which, being of greater diameter than the
tapered part of the elastic nut, expands it and so causes it to exert a grip on the
bolt which locks the nut thereon and thus prevents it from becoming loosened by
vibration.
Fig. 1 of the accompanying drawings is a section of a nut according to this
invention, the other figures showing plans of square and hexagonal nuts as the metal
may be cut across in order to give elasticity. The screw threaded hole in the nut, as
seen in Fig. 1, is of uniform diameter for about two thirds of the depth of the nut, the
remaining or upper third part of the depth having its threaded hole tapering to a
somewhat smaller diameter, and having the metal outside the hole cut across.
When

page_text: the nut is square, the cuts may be made parallel to the sides as shewn in Fig. 2 or
along the diagonals as shewn in Fig. 3. Hexagonal nuts may have three cuts as in
Figs. 4 and 5, or six cuts as in Figs. 6 and 7.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is :
The manufacture of a lock nut having its screwed hole for part of the depth of
diameter to fit the bolt, and for the rest of the depth tapering to a smaller diameter,
the metal around the smaller part of the hole being cross cut, substantially as and for
the purposes herein set forth.
ABEL & IMRAY,
Agents for the Applicant.