Year: 1899

page_text: I, HENRY EDWARD JAMES, of 24, Ravenstone Road, Hornsey, N., Engineer, do
hereby declare the nature of this invention to be as follows:-
This invention relates to an improved lock nut and has for its object to provide
a simple and efficient means whereby the nuts upon bolts, studs, or the like, may
be prevented from becoming slack from any accidental cause.
In carrying the invention into effect I provide the stud or bolt with two nuts
which may be of different depths and each provided with an internal thread
adapted to engage with the thread of the stud. The upper of the two nuts is
undercut for some distance and within such undercut portion is formed a screw
thread opposite in direction to that upon the stud or bolt and of a different
pitch thereto. Engaging with this last thread is a male thread formed upon the
lower nut, which is turned down for some portion of its depth for the purpose
of receiving the thread. When in use the lower nut is first screwed into the
upper and the two may then be placed upon the bolt or stud and treated the
same as an ordinary nut. When the nut has been screwed down until tight a
slight additional forward turn given to the outer nut will securely lock the whole
upon the stud, thus preventing any accidental slacking thereof.
11
1/11
1000
J. E. EVANS-JACKSON & Co.,
Agents for the Applicant.
I, HENRY EDWARD JAMES, of 73, Effingham Road, late of 24, Ravenstone Road,
Hornsey, N., 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:
This invention relates to an improved lock nut and has for its object to provide
a simple and efficient means whereby the nuts upon bolts, studs or the like
be prevented from becoming slack from any accidental cause..
may
In carrying the invention into effect I provide the stud or bolt with two nuts
which may be of different depths and each provided with an internal thread
adapted to engage with the thread of the stud. The upper of the two nuts is
undercut for some distance and within such undercut portion is formed a screw
thread opposite in direction to that upon the stud or bolt and of a different
pitch thereto. Engaging with this last thread is a male thread formed upon the
Price 11

page_text: lower nut, which is turned down for some-portion of its depth for the purpose
of receiving the thread.
In order that the invention may be the better understood drawings are appended
in which:-
Fig. 1 is an elevational view showing the lock nut applied to an ordinary
bolt the nut being shown in section..
Fig. 2 is an elevational view of the inner portion of the nut.
Fig. 3 is a sectional view of the outer part of the nut and
Fig. 4 is a plan of same.
Referring to the drawings "a is the threaded portion of the bolt with which
engages the nut formed in two parts b and c which are drilled and tapped with
a central hole in each to receive the same. The inner part 6 of the nut is
reduced in diameter upon the outside for some portion of its length and has
formed upon such reduced portion a thread 61 of opposite direction to that upon
the bolt. This latter thread is designed to engage with a corresponding thread c
formed upon interior of the outer portion of the nut e, which thus is provided
with two internal threads, respectively right and left hand. In the illustration
the thread upon the bolt being a right hand thread, the thread & engaging there-
with, will be right handed and the thread left handed, the thread upon
the part corresponding therewith.
b
When it is desired to place the nut in position the parts b and c are first
screwed together and the nut manipulated in the usual manner until it is screwed
home when a slight additional turn given to either portion of the nut will lock
the same upon its stud or the like so as to effectually prevent any accidental
displacement thereof.
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: -
The improved lock nut, for bolts and the like consisting of a nut formed
in two parts and each provided with a hole tapped to agree with the thread
on the bolt to which the nut is applied and provided respectively with an external
and internal thread designed to engage one with the other the said threads being
opposite in direction to that upon the stud or the like substantially as herein
described and illustrated by the appended drawings.
Dated this 17th day of March 1900.
J. E. EVANS-JACKSON & Co.,
Agents for the Applicant.