IMPROVEMENTS IN LOCK NUTS
Year: 1884

page_text: I WILLIAM JOHN CLAPP of Nantyglo in the County of Monmouth, Surgeon
do hereby declare the nature of the said Invention for IMPROVEMENTS IN LOCK
NUTS to be as follows:-
The invention relates to means for preventing the nuts of screw bolts and other
screws from becoming loose or unscrewing when subjected to shocks, vibrations or
other disturbing influences after they have been tightened up.
For this purpose I employ as heretofore a pair of nuts one acting to secure the
work, the other (a thinner one) to effect the locking of the main nut but instead
of causing the second nut to beat down tightly as heretofore upon the first or inain
nut I according to my present Invention employ it to act upon the heads of pins
or studs which I place within holes or perforations formed through the body or at
the edges of the main nut:
These pins or studs are formed of comparatively hard material (preferably steel)
and somewhat longer than the thickness of the main nut so as to enable them to
be acted upon by the second nut. I also in some cases make such pins or studs
tapered or with enlarged heads so that they may for facility of packing and for
other purposes, be prevented from dropping entirely through the holes or perforations
in the main nut but shall be held therein by the second or supplemental nut.
In any case however the pins or studs and the holes or perforations are so formed
and proportioned that the points of the studs or pins shall be able to pass beyond
the back of the main nut and the heads thereof stand somewhat above the face"
thereof. By these means the main nut is free to be screwed or tightened up to the
fullest extent required and then in order to lock or secure the same in position the
second or supplemental nút is screwed up so as to exert a considerable pressure upon
the heads of the pins or studs and thereby force their, points upon or into the
surface upon which the main, nut is screwed.
,

page_text: I WILLIAM JOHN CLAPP of Nantyglo in the County of Monmouth, Surgeon
do hereby declare the nature of my said Invention for IMPROVEMENTS IN LOCK
NUTS 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 means for preventing the nuts of screw bolts and other
screws from becoming loose or unscrewing when subjected to shocks vibrations or
other disturbing influences after they have been tightened up.
For this purpose I employ as heretofore a pair of nuts, one acting to secure the
work, the other, (a thinner one), to effect the locking of the main nut but instead
of causing the second nut to bear down tightly as heretofore upon the first or main
nut I according to my present invention employ it to act upon the heads of pins
or studs which I place within holes or perforations formed through the body or at
the edges of the main nut. These pins or studs are formed of comparatively hard
material (preferably steel) and somewhat longer than the thickness of the main
nut so as to enable them to be acted upon by the second nut.
I also in some cases make such pins or studs tapered or with enlarged' heads so
that they may for facility of packing and for other purposes, be prevented from
dropping entirely through the holes or perforations in the main nut, but shall be
held therein by the second or supplemental nut.
In any case however the pins or studs and the holes or perforations are so formed
. and proportioned that the points of the studs or pins shall be able to pass beyond
the back of the main nut and the beads thereof stand somewhat above the face
thereof. By these means the main nut is free to be screwed or tightened up to the
fullest extent required and then in order to lock or secure the same in position the
second or suppleinental nut is screwed up so as to exert a considerable pressure
upon the heads of the pins or studs and thereby force their points, upon or into
the surface upon which the main nut is screwed.
And in order that my said invention may be more clearly understood and readily
carried into effect I will proceed aided by the accompanying drawings more fully
to describe the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is an elevation and Figure 2 is a plan, both partly in section representing
one mode in which I carry my invention into effect and Figure 3 is an elevation
and Figure 4 is a plan, both partly in section representing another mode in which
I carry my invention into effect and Figure 5-is a side view of one of the pins or
studs used with the arrangement shown at Figures 3 and 4. a is a screw bolt
which may be made of any customary or useful form, materials and dimensions,
b is the main nut which is used in the usual way to secure the work, and c is a
supplemental nut which is thinner than the main nut b and is used to effect the
locking of the main nut in the following manner.
Instead of causing the supplemental nutc to bear down tightly as heretofore
upon the main nut 6 I according to my present invention employ it to act upon

page_text: the heads of pins or studs d which I place within holes or perforations 6¹ formed
either through the body of the nut b as shown at Figures 1 and 2 or at the edges
of the same as shown at Figures 3 and 4. These pins or studs are formed of
comparatively hard material (preferably steel) and somewhat longer than the
thickness of the nut b so as to enable them to be acted upon by the nut c.
I also in some cases make such pins or studs d tapered or as shown in the
drawings with enlarged heads so that they may, for facility of packing and for
other purposes, be prevented from dropping entirely through the holes or
perforations 6' in the nut 6 but shall be held therein by the nut c.
In any case however the pins or studs d and the holes or perforations 6¹ are so
formed and proportioned that the points of the studs or pins d shall be able to pass
beyond the back of the nut b and the heads thereof stand somewhat above the
face thereof. By these means the main nut b is free to be screwed or tightened
up to the fullest extent required and then in order to lock or secure the same in
position the nut c is screwed up so as to exert a considerable pressure upon the
heads of the pins or studs d and thereby force their points upon or into the surface
upon which the main nut is screwed.
It will be seen on reference to Figures 3 and 4 that the holes or perforations 6¹
in the sides of the nut b are of dovetail form and that the pins or studs d are of
corresponding form in cross section, this form is adopted in order to prevent the pins
or studs d from falling out. sideways from such holes or perforations. Any other
suitable form for these parts may however be adopted so long as the above object
is realized.
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
A nut 6 formed with holes or perforations 6' to receive pins or studs d which are
acted upon by a supplemental nut c substantially as herein shown and described
and for the purpose stated.