Improved Means of Locking Nuts on Bolts.
Year: 1892

page_text: Date of Application, 29th Oct., 1892-Accepted, 28th Jan., 1893
Improved Means of Locking Nuts on Bolts.
I, DONALD MACRAE, of The Villa, Salen-Aros, Mull, North Britain, 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:-
My invention relates to an improved means of locking nuts on bolts, and has for
its object to provide a nut which can be easily and efficiently locked or unlocked as
desired.
In order that my invention may be properly understood and readily carried into
effect I have hereunto appended an explanatory sheet of drawings in the several
figures of which corresponding parts are marked with the same letters of reference.
Figure 1 is a part section and part elevation showing my improvements.
Figure 2 is a plan of the same.
Figure 3 is a segmental view showing rack and spring.
Figure 4 is a part section and part elevation showing a different arrangement of
locking nut.
Figure 5 is a plan of the same.
Figure 6 is a segmental view showing spring.
Figure 7 is an elevation of a further modification showing part of a bolt only.
Figure 8 is a plan of the same.
A is the bolt; B are the threads, which may be of any convenient form ; C are
the grooves provided on each side of the bolt; D is the nut which may be square,
hexagonal, or of any other form. If necessary they may be also a little deeper
than ordinary so as to engage with more threads of the bolt in order to compensate
for the parts of the threads cut out by the slots.
Referring to Figures 1, 2, and 3, A is the bolt having a thread B cut on it; and
D is the nut. A ring E of metal or other suitable material is connected to, and
caused to move up and down with, the nut by the studs c', c which work in
the horizontal groove b formed in the nut. The ring E is prevented from turning
with the nut by the pins or feathers c³, working in the vertical slots C cut in the
bolt A. On the exterior of the ring E a left-handed screw is cut, in which a
second ring F engages. On the upper surface of the nut D a ratchet is cut as
shown at Figure 3, and to the under surface of the ring F a spring catch dis
attached so that when the ring F is screwed down the spring catch d engages with
the ratchet and locks the ring F and nut D together; as the nut D is working on a
right-handed screw on the bolt A while the ring F is working on a left-handed
screw on the ring E the nut is locked and cannot be unscrewed.
The locking arrangements in Figures 7 and 8, are similar to that as described
with reference to Figures 1, 2, and 3, but the ratchet is formed on the lower surface
of the ring F while the spring is attached to the upper surface of the nut D. The
studs c', in place of working in the groove formed in the nut D as shown in
Figures 1, 2 and 3, are inserted from the surface of the nut and work in a groove
formed in E.
In Figures 4, 5 and 6 a similar locking arrangement is illustrated, but the inter-
mediate ring Ę is dispensed with, and a right and left handed screw is cut on the
bolt. The upper part being left-handed while the lower is right-handed, the ring F
works on the upper left-handed screw, while the nut D works on the lower right-
handed screw.
A ratchet and spring as already described is provided by which
the ring and nut are locked together and the nut is prevented from unscrewing.
D

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The improved means of locking nuts on bolts substantially in the manner as
described and illustrated on the annexed sheet of drawings.
Dated this 20th day of October 1892.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents.