Year: 1887

page_text: Date of Application, 15th Aug., 1887
Complete Left, 11th June, 1888
Complete Accepted, 13th July, 1888
1, FREDERICK JOHN TALBOT of Ranmoor Park, Sheffield, in the County of York
Engineer, do hereby declare the nature of this invention to be as follows:-
In carrying my present invention into effect I first form a nut in the usual manner
and I then make a saw cut through one side thereof for a considerable depth, this saw
cut may be either in a line parallel with the axis of the bolt or at an inclination
thereto and in some cases I cut a weakening groove in the side of the nut which
groove may be either parallel with the axis of the nut and at a short distance from
and parallel with the aforesaid saw cut and of equal or unequal length or it may be
formed at an inclination to the saw cut whether the latter is parallel or not with the
axis of the nut in which latter case the said weakening groove is preferably arranged
to meet or closely approach the lower end of the saw cut; or I may extend the saw
cut which I form at an inclination with the axis of the bolt through more than one
side of the nut.
Having treated a nut in any of the modes above described, I then force inwards a
portion of one side of the nut adjoining the saw cut thereby causing an elastic
triangular shaped piece of metal with the threads thereon to encroach on the hole
through the nut. In some cases I dispense with the said saw cut and I form the said
weakening groove of such width and depth in one or more sides of the nut that the
bottom of the groove or grooves with the threads thereon may with a suitable tool be
pressed inwards to diminish or encroach on the size of the hole in the nut and form a
sort of flexible clip to retain the bolt.
Thus when a nut so formed is screwed on its bolt, a considerable pressure will be
required to screw it fully on and the said elastic triangular shaped piece of metal or
flexible clip will exert a constant pressure on the bolt to prevent the slacking or
chattering back of the nut thereon in addition to which when the said saw cut is used
it may be so cut that the said elastic piece of metal may have its edge and consequently
the ends of the threads thereon formed at an acute angle so that the latter will have
a tendency to cut into the threads of the bolt in any back action of the nut and
thereby further secure the nut on the bolt.
Dated this 15th day of August 1887.

page_text: I, FREDERICK JOHN TALBOT of Ranmoor Park, Sheffield, in the County of York,
Engineer, do hereby declare the nature of my said invention, and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement :-
In carrying my present invention into effect, I first form a nut in the usual manner
and I then make a saw cut or slit through one side thereof for a considerable depth;
this saw cut or slit may be either in a line parallel with the axis of the bolt or at an
inclination thereof, and in some cases I cut or slit a weakoning groove in the side of
the nut, which groove may be either parallel with the axis of the nut, and at a short
distance from and parallel with the aforesaid saw cut or slit, and of equal or unequal
length, or it may be formed at an inclination to the saw cut, whether the latter is
parallel or not with the axis of the nut, in which latter case the said weakening
groove is preferably arranged to meet, or closely approach, the lower end of the saw
cut or slit, or I may extend the saw cut or slit, which I form at an inclination with
the axis of the bolt, through more than one side of the nut.
Having treated a nut in any of the modes above described, I then force inwards a
portion of one side of the nut adjoining the saw cut or slit thereby causing an elastic
triangular shaped piece of metal with the threads thereon, to encroach on the hole
through the nut.
In some cases I dispense with the said saw cut or slit and I form the said weakening
groove of such width and depth in one or more sides of the nut that the bottom of
the groove or grooves with the threads thereon may with a suitable tool be pressed
inwards to diminish or encroach on the size of the hole in the nut and form a sort of
fiexible clip to retain the bolt.
My Invention is illustrated in the accompanying drawings in the various figures of
which like parts are indicated by similar letters of reference.
a represents the bolt and the nut which are made in any ordinary or well known
manner, c is a saw cut or slit made for a considerable depth through one side of the
nut so as to cut through the threads thereof and d is a weakening groove formed in
the side of the nut. These weakening grooves d where used in combination with the
saw cut or slit c are employed to facilitate the forcing inwards of a triangular
portion of one side of the nut adjoining the saw cut or slit c and lying between
the latter and the weakening groove d and also to reduce the resistance of the said
portion when screwing the nut upon the bolt. The saw cut or slit c and the
weakening groove d may however be employed independently of each other.
In the nut represented at Figures 1, 2, 3 and 4 I make a saw cut or slit c through
one side thereof in a plane parallel to one passing through the axis of the nut and
I force inwards a portion of one side of the nut adjoining the saw cut or slit c by
applying pressure to the upper part thereof thereby causing an elastic triangular

page_text: shaped piece with the threads thereon to encroach on the tapped hole as originally
formed through the nut. The nut thus formed is shown separately at Figures 3
and 4 whilst at Figures 1 and 2 it is shown as it would appear after it has been
screwed onto the bolt a.
In the nut b represented at figures 5, 6, 7 and 8 a saw cut or slit c is made in a
similar position to that of the nut shown at figures 1 to 4 but in addition thereto
I employ a narrow weakening groove d parallel with the saw cut or slit c and I force
inwards that portion of the side of the nut lying between the saw cut or slit c and
the weakening grooved by applying pressure to the upper part thereof. At figures 5
and the nut is shown with the saw cut or slit c and weakening grooved before the
part has been forced inwards and at Figures 7 and 8 the nut is shown in its
completed form.
other.
In the nut represented at Figures 9 to 12 a saw cut or slit c and weakening
grooved parallel with each other are employed as in the nut represented at
Figures
to S except that the weakening groove d is broader in the one than in the
In the nut represented at figures 13 to 16 a saw cut or slit c is made parallel with
the axis of the nut as in those previously described but the weakening groove d is
formed at an
angle therewith and so as slightly to overlap the bottom of the saw cut
or slit c. In this case the triangular shaped piece lying between the saw cute and
the weakening grooved is forced inwards by applying pressure near to the upper
angle thereof.
In the nut represented at Figures 17 to 20 I employ a saw cut or slit c and
weakening grooved in a similar manner to that described with respect to the nut
represented at figures 13 to 16 except that the weakening groove d is narrower in the
one case than in the other.
In the nut represented at Figures 21 to 24 1 make the saw cut or slit c at an
inclination to the axis of the nut whilst I make the weakening grooved in a plane
parallel therewith otherwise the nut is similar to that represented at figures 17 to 20.
In the nut represented at figuros 25 to 28 I make a saw cut or slit c at an incli-
nation to the axis of the nut, in a similar manner to that described with respect to the
nut shown at figures 21 to 24 but in the present case I use a shorter weakening
groove d than that shown in the previous figures.
с
In the nut represented at figures 29 to 32 I employ only the saw cut or slit c which
1 make in an angular direction from the top of the nnt commencing at the right side
of the bore and extending beyond the centre line of that side of the nut and I force
inwards the part 1 by applying pressure thereto near the upper angle thereof.
In the nut represented at Figures 33 to 36 I also make use of an angular saw cut
or slit e and dispense with the weakening grooved but I commence the saw cut at the
top right corner of one side of the nut.
с
By making the saw cut or slit c either parallel with the axis of the nut or inclined
thereto in a direction from right to left as shown in the drawings the triangular shaped
piece b¹ will not be liable to be forced upwards when screwing the nut upon the bolt
but the threads of the latter will lead naturally into the threads of the said triangular
shaped piece b¹.
When employing a saw cut in the construction of the above described forms of
lock nut such saw cut may be made either before or after the tapping of the nut but
when employing a slit such slit must be made before the tapping of the nut.
By the aforesaid construction of lock nut the hole theroin for a certain portion of
the length thereof is truly circular so as to enable the nut to be freely screwed a
certain distance on to the bolt but so far as the form of such hole is affected by the
forcing in of the triangular shaped piece b₁ that portion of the hole is gradually
changed in form until at the top of the nut the said hole assumes somewhat the shape
of one coil of a volute by which means the nut offers a gradually increasing resistance
when being screwed on to the bolt and such resistance reaches its maximum when the
nut is fully screwed on.

page_text: In the nut represented at figures 37 to 4) I dispense with the saw cut or slit c. and
employ only a weakening groove d formed longitudinally in the centre of one side of
the nut and of such a width and depth that the bottom of the groove with the threads
thereon may with a suitable tool be pressed inwards so as to diminish or encroach on
the hole in the nut as shown at figures 39 and 40 and thereby form a sort of flexible
clip to retain the bolt.
In the nut represented at Figure 41 I form a weakening groove d on each of two
opposite sides thereof and of a similar character to that shown at figures 37 to 40 so
as to form a flexible clip on each side of the nut.
Thus when a nut constructed in any of the ways hereinbefore described is screwed
on its bolt a considerable pressure will be required to screw it fully on and the said
elastic triangular shaped piece of metal or the flexible clip will exert a constant
pressure on the bolt to prevent the slackening or chattering back-of the nut thereon
in addition to which when the saw cute is used it may be so cut that the said elastic
piece of metal b' may have its internal edge and consequently the ends of the threads
thereon formed at an acute angie as shown in the drawings so that the latter will have
a tendency to cut into the threads of the bolt in any back action of the nut and
thereby further secure the nut on the bolt.
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 :-
1. A lock nut having a saw cut or slit in combination or not with a weakening
groove and having a portion of the side of the nut adjacent to such saw cut or slit
forced inwards substantially as herein shown and described.
2. A lock nut having a weakening groove in one or more sides thereof and with a
portion of the metal at the bottom of such groove or grooves forced inwards, sub-
stantially as herein herein shown and described
FREDERICK JOHN TALBOT.
By Harris & Mills,
23, Southampton Buildings,
Agents.