IMPROVEMENTS IN NUT Locks
Year: 1877

page_text: LETTERS PATENT to William Agnew Pope, of Cannon Street, in the City of
London, for the Invention of "IMPROVEMENTS IN NUT Locks." A com-
munication from abroad by Joseph Jones, of Chicago, Illinois, United States of
America.
PROVISIONAL SPECIFICATION left by the said William Agnew Pope at the
Office of the Commissioners of Patents on the 29th December 1877.
WILLIAM AGNEW POPE, of Cannon Street, in the City of London. "IMPROVE-
MENTS IN NUT LOCKS." A communication from abroad by Joseph Jones, of Chicago,
Illinois, United States of America.
The object of this Invention is to provide a nut so arranged as to admit of its
being locked in position upon the bolt by clamping the nut to the bolt, and to that
end the Invention consists in providing the nut proper with an elongated tapering
sleeve, which is screw-threaded internally and externally, the internal thread
running in an opposite direction to the external thread, in combination with a
clamp nut mounted upon the said sleeve, so that when the clamp nut is turned
upon the sleeve to move it from the nut proper it will ride up the tapering part of
the sleeve, and compress the same against the bolt, thereby increasing the frictional
contact of the bolt and sleeve, and so as to prevent the nut proper from being
turned upon the bolt, or from becoming loosened.
In carrying out this Invention the elongated sleeve is made to form part of the
nut, and projects from the back thereof in a plane parallel with the plane of the
sides of the nut; it is screw-threaded internally, as before mentioned, such internal
thread corresponding with the screw thread in the nut proper, and with a screw
thread on the bolt; and it is, moreover, slotted longitudinally, so as to form two or
more parts or jaws adjusted to rest against the threaded portion of the bolt,
D
1

page_text: The sleeve is also made tapering, as before mentioned, increasing in diameter
from the nut proper, that is to say, the wall of the sleeve is made thicker at its
outer end than at the junction with the nut, so that when the nut is screwed upon
the bolt the diameter of the sleeve at its outer end will exceed its diameter at its
junction with the nut. The clamp nut is screw-threaded internally to correspond
with the exterior thread formed on the sleeve, and the diameter of its opening is
made equal to the smallest diameter of the sleeve.
In the application of the said improved nut lock the clamp nut is first screwed
upon the sleeve until in close proximity to the back of the nut proper. The latter is
then screwed upon the bolt to the position in which it is to remain at rest when
the clamp nut is turned on the sleeve in the direction to move it from the nut, and
so as to ride up the taper of the sleeve, and compress the jaws firmly between the
bolt and the clamp nut, thereby increasing the frictional contact of the several parts,
and preventing the nut proper from being turned backward on the bolt.
The object of forming the external screw thread on the sleeve in a direction
opposite to the internal screw thread in the sleeve and nut proper is to prevent the
said nut from being turned backwards on the bolt when the clamp nut is being
turned towards the outer end of the sleeve; and the object of slotting the sleeve, as
described, is to allow its outer end to be more freely contracted by the action of the
clamp nut.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Agnew Pope in the Great Seal Patent Office on the 25th
June 1878.
WILLIAM AGNEW POPE, of Cannon Street, in the City of London. "IMPROVE-
MENTS IN NUT LOCKS." A communication from abroad by Joseph Jones, of Chicago,
Illinois, United States of America.
The said Invention has for its object the production of a nut so arranged as to
admit of its being locked in position upon the bolt by clamping it to the latter, and
consists in providing the nut proper with an elongated sleeve, which is screw-
threaded internally and externally, the internal thread running in an opposite
direction to the external thread, and is taper, increasing in diameter towards its
outer end, and is also slotted; and in employing the same in combination with a
clamp nut mounted upon the said sleeve, so that when the clamp nut is turned
upon the sleeve in the direction to move it from the nut proper, it will ride up the
tapering part of the sleeve, and compress the same against the bolt, thereby
increasing the frictional contact of the bolt and sleeve, and preventing the nut
proper from being turned upon the bolt, or from becoming loosened.
And in order that the said Invention may be fully understood, I shall now
proceed more particularly to describe the same, and for that purpose shall refer to
the several Figures on the annexed Sheet of Drawings, the same letters of reference
indicating corresponding parts in all the Figures.
Figure 1 of the Drawings represents a perspective view of a bolt with the nut
proper and clamp nut in position thereon, and Figures 2 and 3 are similar views of
the nut proper and clamp nut respectively detached.
A is the bolt, which may be made of iron, and be of usual construction; B is
the nut proper, which is made of any suitable form laterally to receive the wrench
for turning the nut to its place upon the bolt; C is an elongated sleeve formed as
part of the nut, and projecting from the back thereof in a plane parallel with the
plane of the sides of the nut; it is screw threaded internally to correspond with
the screw thread in the nut proper B, and with the screw thread on the bolt, and
is slotted longitudinally, as shown at a, a, so as to form jaws b, b, adjusted to rest
against the threaded portion of the bolt. The sleeve C is also made tapering,
increasing in diameter from the nut proper B, that is to say, the wall of the sleeve
is made thicker at its outer end at b, b, than at the junction with the nut, so that
when the nut is screwed upon the bolt the diameter of the sleeve at its outer end
will exceed its diameter at its junction with the nut.
The sleeve is, moreover,
screw threaded externally, as shown in Figures 1 and 2 ; and such external thread
is formed in a direction opposite to that of the internal thread of the sleeve and nut.
D is the clamp nut, which is screw threaded internally to correspond with the
external thread on the sleeve, the diameter of its opening being equal to the smallest
diameter of the sleeve.
In the application of this improved nut lock the clamp nut D is first screwed upon
the sleeve C until in close proximity to the back of the nut B. The nut B is then
screwed upon the bolt to the position in which it is to remain at rest, after which
the clamp nut D is turned on the sleeve in the direction to move it from the nut B,
and so as to ride up the taper of the sleeve C, and compress the jaws b, b, firmly
between the bolt and the clamp nut, thereby increasing the frictional contact of
the several parts, and preventing the nut B from being turned backwards on
the bolt.
The object of forming the external screw thread on the sleeve in a direction
opposite to that of the internal screw thread in the sleeve and nut proper, is to
prevent the said nut from being turned backwards on the bolt when the clamp nut
is being turned towards the outer end of the sleeve; and the object of slotting the
sleeve, as described, is to allow its outer end to be more freely contracted by the
action of the clamp nut.

page_text: Having now described and particularly ascertained the nature of the said In-
vention, and the manner in which the same is or may be used or carried into effect,
I would observe in conclusion that I am aware that it has previously been proposed
to use a nut having a slotted sleeve screw-threaded externally and internally in
combination with a clamp nut, and therefore to this in itself I lay no claim; but
what I consider to be novel and original, and therefore claim as the Invention
secured to me by the herein-before in part recited Letters Patent is, the employment
of a nut having a slotted sleeve, which is screw-threaded externally and internally
in such a manner that the external screw threads run in the opposite direction to
the internal screw threads, and is made taper, its wall gradually increasing in
thickness from the nut proper to the outer end in combination with a clamp nut
working upon the said sleeve, substantially as and for the purpose herein-before
described.
In witness whereof, I, the said William Agnew Pope, have to this my Speci-
fication set my hand and seal, the Thirteenth day of June, One thousand
eight hundred and seventy-eight.