IMPROVEMENTS IN NUT-LOCKS
Year: 1885

page_text: We JUSTIN HERBERT BURDICK and ELLERY HERBERT BURDICK of Utica, in
the County of Dane and State of Wisconsin, and Milton in the County of Rock
and State of Wisconsin, in the United States of America, gentlemen, do hereby
declare the nature of the invention for IMPROVEMENTS IN NUT-LOCKS 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 improvements in nut-locks for screw-bolts and will be
fully described hereinafter.
In the drawing.
Fig. 1 is a cross-section of lock-nuts embodying this invention, in position on a
screw-bolt just before locking.
Fig. 2 is a like view of the same in the locked position.
Fig. 8 is a sectional view on line x-x of Fig. 4.
Fig. 4 is a top plan view of the main nut and
Fig. 5 is an underside plan view of the jam-nut.
A is the screw-bolt, and B is the main nut, in the outer face of this nut we
provide a series of semi-spheroidal depressions or sockets, b, b, b, b, the edges of and
spaces between which are rounded out as shown at b₁ in Fig. 3. B₁ is the jam or
lock-nut and this nut is provided on its inner face with a semi-spheroidal lug b¹
projecting from it at such a point as to correspond with the sockets b, of the
nut B, in either one of which the said lug is designed to lodge when the nuts are
locked in position. If desired, a succession of two or three of the jam-nut lugs b'
may be used.
The main nut B having reached its seat against the bar, as usual,
the nut B' is screwed against it as far as it can be done. As the projecting lug b₁
impinges against the outer face of the main nut B, it deflects it diagonally as
shown, so that the inner edge of its thread on one side, that is on the side of the
lug 6 will be pressed hard against the outer edge of the bolt thread, while on the
opposite side, the outer edge of the nut thread will impinge against the inner edge
of the bolt-thread, The same deflection will also be caused but in reversed
direction, in the nut B¹ and the bolt A will in this mauner be so tightly grasped
that if care has been taken to turn the nut B' so that, at the end of its travel, the
rn
7"

page_text: lug b¹ fall in one of the sockets b, no amount of vibration will dislodge it there-
from, and nothing less than a strain equal to that of the wrench by means of which
it was so locked, will unloosen the nut's hold on the bolt. Both the depressions b, b,
and the lug b¹ may be made of another shape than that above described such as
oval or elliptical without departing from the spirit of this invention.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is
1. The combination with a main screw-bolt nut having a series of semi-
spheroidal sockets in its outer face, of a locking-nut provided on its inner face
with a semi-spheroidal lug adapted to lodge in either one of the sockets of the
main nut at the end of its course, whereby the bolt is tightly grasped and the nuts
locked in position around the same, substantially as set forth.
2. The combination with a threaded bolt, of a main nut having a series of
sockets arranged at regular intervals in its outer face, the spaces between each two
consecutive sockets being rounded down to make a continuous curved surface all
around the said nut, and a locking nut provided on its inner face with a lug of
shape corresponding to the sockets in the other nut substantially as set forth.