Improvements in Nut Locks.
Year: 1899

page_text: Date of Application, 16th Jan., 1899-Accepted, 18th Feb., 1899
Improvements in Nut Locks.
We, THOMAS BROADBENT, Moulder, of 13, Waterloo Avenue, in the City of
Toronto, in the County of York, in the Province of Ontario, Canada, and JAMES
BROADBENT, Farmer, of 1119, Mound Street, in the City of Madison, in the
County of Dane, in the State of Wisconsin, United States of America, do hereby
declare the nature of this invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
Our invention relates to improvements in nut locks and the object of the
invention is to design a simple, cheap, efficient and indestructible nut lock and
it consists essentially of a metal washer-plate made preferably of corresponding
contour to the sides of the nut and having a flat spring arm formed integrally
therewith and designed to normally extend parallel with the bolt, the outer end
being bent and designed to engage with a notch in the end of the bolt as here-
inafter more particularly explained.
Fig. 1, is a perspective view of three plates held together by a bolt and nut,
the nut end of the bolt being only shown with the nut and nut lock in position.
Fig. 2, is a section through Fig. 1.
Fig. 3, is a perspective detail of the nut lock.
Fig. 4, is a plan view looking from the inside of the nut lock.
In the drawings like letters of reference indicate corresponding parts in each
figure.
AAA are three plates, which are secured together by the bolt B, the threaded
end of which is provided with a nut C. The nut in this case is a hexagonal
rut. Before the nut is placed on the bolt however, the washer plate D is placed
in position. The washer plate D is provided with an arm d, which is tapered as
snown and is narrower than any of the sides c of the nut C, as will be seen in
reference to Fig. 1.
The tapered arm d extends parallel with the bolt and has a curved outer end d¹.
The taper ends at the bottom of the curved outer end, the remaining inwardly
extending portion of the arm being straight not tapered, that is having the
sides parallel.
The washer D has a centre hole 3 through which the bolt extends. The bolt
is provided at the end preferably with two cross notches & crossing the centre
of the holt on the end.
In order to screw the nut home the wrench may be placed over the nut even
over the side in which the arm extends as such arm is narrower than the sides
as hereinbefore stated and when the nut and washer have been brought in
proximity with the surface of th plate A a small plate E as indicated in dotted
lines in Fig. 2, is placed on the end of the bolt, so as to prevent the end
dropping into the notch b. As soon as the nut has been screwed perfectly home
against the plate and the end is on a line with the notch the plate E
be driven out in any suitable manner whereupon as the arm is a spring arm it
may

page_text: will spring in from the position shown in dotted lines in Fig. 2 to that shown
u full lines, that is into the notch b', thereby holding bolt and nut securely locked
together.
We are aware that nut locks have been devised in which lugs and posts have
been used to extend into a notch at the end of the bolt or to grip a flattened
end of the bolt and we do not lay claim broadly to any such device in connec-
tion with said plates for the nut for holding such devices in position.
As far as we are aware, however, in these devices either the nut lock is
destroyed after once being used or the nut is weakened. In our own nut lock,
however, there are none of these defects and it will be seen that the fact of
having the washer extending inside the nut itself and provided with an arm
forming portion of such washer plate, that the parts are frictionally held in a
much better way than in any device of which we are aware.
Another advantage arising from the use of our nut lock is, that it can be
used over and over again as it is only necessary to use any simple prying device
in order to remove the end of the spring arm out of the notch b when the
plate E may be placed back in position and the nut unscrewed.
It will be seen in our device also that even when the end of the bolt comes flush
with the outer surface of the nut or even slightly in, that the end of the spring
arm being parallel will extend into the notch, which it would not do if the arm
were tapered to the very end.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:
-
1. A nut lock comprising a washer designed to fit inside the nut and having
a spring arm integrally formed with such washer provided with a bent end, the
tip of which is designed to engage with a notch in the end of the bolt as and
for the purpose specified.
2. The combination with the bolt provided with a cross notch or notches and
the nut fitting thereon, of the washer plate corresponding in form to the sides
of the nut and having a tapered spring arm narrower than any side and pro-
vided with a curved outer end having a straight tip designed to fit into the
notch on the end of the bolt as and for the purpose specified.
Dated the 16th day of January 1899.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant