IMPROVEMENTS IN LOCKNUTS
Year: 1885

page_text: I, EDWARD CHARLES. IBBOTSON 184 Shurtliff Street Chelsea State of Massa-
chusetts United States of America Merchant do hereby declare the nature of my
said invention for IMPROVEMENTS IN LOCKNUTS to be as follows:―
.
My invention is to provide a simple means of preventing the nut of a bolt or
other screw from accidentally turning back or unscrewing, and it consists in cross
cutting the end of a nut which preferably. is made deeper than nuts usually are, so
that it shall be radially expansible at the end so cut. I make the inside diameter
of the end of the nut which is to be cross cut of rather smaller diameter than the
other end, so that it will not pass over the scrow or bolt until sufficient force is
exerted to expand the nut radially, thus the screw or bolt will be tightly gripped
and the nut held secure by its inherent elasticity..
I do not bind myself to any particular number of sawgates or crosscuts, but in
octagon nuts one in each face or flat will answer the purpose, if the slots or cuts are
made of sufficient depth.
Instead of making the nut of a smaller diameter internally at the end to be
grooved or sawn by means of tools and tapered taps, I may if desirable close the
end after it has been sawn or grooved.
ROBT F. DRURY,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Locknuts.
I, EDWARD CHARLES IBBOTSON 184 Shurtliff Street Chelsea State of Massa-
chusetts United States of America Merchant do hereby declare the nature of my
invention for IMPROVEMENTS IN LOCKNUTS and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement, that is to say:-
My invention is to provide a simple means for preventing the nut of a bolt or.
other screw from accidentally turning back, or unscrewing, and it consists in Cross
Improvements in Locknuts.
I, EDWARD CHARLES IBBOTSON 184 Shurtliff Street Chelsea State of Massa-
chusetts United States of America Merchant do hereby declare the nature of my
invention for IMPROVEMENTS IN LOCKNUTS and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement, that is to say :-
My invention is to provide a simple means for preventing the nut of a bolt or.
other screw from accidentally turning back, or unscrewing, and it consists in Cross

page_text: cutting the end of the nut so that it shall be radially expansible at the end so cut;
and in order that my invention may be clearly understood I have annexed a sheet
of drawings illustrating same.
in the nauta
Fig. 2, 18 a plan of same,
Fig. 3, a modification of same.
Fig. 4, plan of same.
Fig. 5, a bolt.
This invention consists (in the first place) in a screw nut made of steel of suitable
temper, or of iron case hardened, having sawgates or cross cuts made transversely
at one end, which is usually called the top of the nut, so as to render it expansible
radially; and in the second place I make the bore of the nut at the end in which
I make the cross cuts, of a smaller diameter than at the opposite end, or that at
which the bolt or screw enters.
Thus when a bolt or screw, is screwed into a nut so prepared, it will not pass
through that part which is cross cut on account of the bore being of smaller or
reduced diameter without considerable force is used, when this force is applied, the
divided end is caused to expand radially, its inherent elasticity gripping the bolt or:
screw which may be of ordinary form, and thus the nut is held securly and
prevented from turning.
'
A is the top, and B the bottom of the nut, C, C, are the cross cut slots, or
sawgates.
The part of the nut bore which is of smaller diameter may be contracted
or. reduced by any suitable means, and with regard to the cross cuts, I do not bind
myself to any particular number, or to the depth of such cuts, nor to their position.
In Fig 1 & 2, I have shown them cut through the flat sides of the nut, and in
Figs 3 & 4, I have shown them cut through the corners.
The bolt shown in Fig. 5, is an ordinary bolt.
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 screw nuts, made from Steel or from iron casehardened
having transverse slots at one end, so as to render that end expansible radially, and
having the screwed centre hole within the expansible portion (or a part thereof)
made of less diameter than in the solid portion, for the purpose specified and
substantially as herein before described and illustrated.
3000