Improvements in Nut Locks.
Year: 1889

page_text: Date of Application 23rd Sept., 1889-Accepted, 23rd Nov., 1889
COMPLETE SPECIFICATION.
Improvements in Nut Locks.
A communication from abroad by JOHN EDGAR, of Rochester, in the County of
Olmstead, State of Minnesota, United States of America.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.ME., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both in
the County of Lancaster, and 323, High Holborn in the County of Middlesex, Civil
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 :-
The invention relates to nut locks, and is designed to hold a nut firmly in
place on a bolt thread.
In the accompanying drawings:-
Figure 1 is a section through a portion of a rail road rail showing a bolt with
the iinproved device arranged thereon.
Figure 2 is a front elevation of the shouldered nut.
Figure 3 is a view similar to Figure 1 with the first nut omitted.
The construction is as follows:-
A nut having projections or shoulders 5 diagonally opposite on its two faces ;
said projections of any required thickness, width and form, is first screwed upon
the bolt 7, till one projection or shoulder bears against the material on the bolt,
which may be either that held by the bolt, as the fish plate 9 of the rail, or a nut 11
already thereon. This primary nnt with shoulders will when pressed home be
tilted, clamped or clutched upon the bolt thread. A second nui 13, plain or common,
is now screwed upon the same bolt and following the primary nut and is brought
to bear against the remaining shoulder thereof. This socond nut will now also be
tilted, clamped or clutched upon the bolt-threads, but in a direction opposite to the
primary nut, so that if the planes in the faces of the two nuts be produced they
will cut each other.
These two nuts, so placed and pressed, stand braced against each other at some
point or line of contact on the shoulder between them, and pressed and braced also
each against opposite sides of the bolt-threads, so that a curved line drawn from the
extreme points of contact of these two nuts, with the bolt-threads, through the point
of contact of the two nuts and wholly on the same side of the bolt as that point of
contact, would describe an arch of which this shoulder of the primary nut is the key
and which key will press the tighter as the nuts are screwed together, inaking this the
most full and complete grip upon the bolt-thread that can be obtained.
The nuts will have an equally strong grip upon each other and upon the bolt
whether or not they bear against the material held by the bolt, and if any slack comes
nto that material the nuts are not affected thereby.
If it is desired that the nuts be locked upon a loose or free bolt, a bolt that may
play end wise, the order of placing them on the bolt is not important, either one may
go on first.
But when the nuts are designed to press upon the material on the bolt,
or when they follow a nut already thereon, the nut with shoulders must first go on,
nd be followed by the common or plain nut.
USES AND ADVANTAGES.

page_text: may be made free or loose, thus saving much time in putting on and taking off. A
stronger, closer pinch can be given to the substance between the head of the bolt and
the nut.
The device may be applied to all bolts now in use, old or new, and without any change
therein, using the old nut with the nut with the shoulders, or by placing the device
on the end of the bolt following the common nut already on. When a straight
pull on the bolt and a full faced bearing of the nut are needed, this latter arrange-
ment is best. The device is universal in its application.
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 mo by
my foreign correspondent, I declare that what I claim is :-
1. A nut with two projections or shoulders diagonally opposite on its faces, said
projections of any required thickness, width or form.
2. The combination of a nut with shoulders as described, and a plain or common
nut on the same bolt bracing or pressing against one of these shoulders.
3. Two nuts as above described, bracing against each other, and against the threads
of the bolt and in opposite directions.
4. The locking of two nuts upon the bolt thread as described, whether or not either
nut bears against the substance on the bolt.
Dated this 21st day of September 1889.
WM. P. THOMPSON & Co.,
Agents for the Applicant.