Improvements in or connected with Lock-nuts.
Year: 1898

page_text: Date of Application, 29th Jan., 1898
Complete Specification Left 25th Oct. 1898-Accepted, 26th Nov., 1898
Improvements in or connected with Lock-nuts.
I, CHARLES STUART, of 28, Gloucester Street, Cardiff, Fitter, and ALFRED
JAMES PERTON WHITAKER, of Penarth, Cardiff, Chartered Accountant, do hereby
declare the nature of this invention to be as follows:-
In a former patent granted to Charles Stuart and Alfred James Perton Whitaker
No. 5148 of 1897, certain improvements were described in or connected with lock
nuts, which had reference more particularly to a contractile nut, that is to say a
nut having a conical neck or tapered portion which is split or cut down one side
and which is combined with a device, whereby, when it is being screwed up, its
split or divided portions of the neck are forced together by a wedge-like action so
that the said nut is caused to contract and thus grip, or firmly bind upon, its
bolt or screw.
Now our present invention consists of improvements in the lock nuts forming
the subject of the aforesaid Letters Patent.
According to our invention the conical neck or tapered portion of the nut is
formed with preferably two or more longitudinal slits or cuts, although in some
cases one slit will suffice for my purpose. The exterior of the said conical neck
or tapered portion is formed with screw threads preferably of fine pitch to receive
a correspondingly screw threaded nut, which when slightly turned in the proper
direction will cause the nut to contract and firmly grip the bolt.
Our improved lock-nut can be made in various sizes, and is applicable to all
purposes for which lock-nuts are employed.
Dotad this 20th day of January 1898.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicants.
Improvements in or connected with Lock-Huts.
We, CHARLES STUART, of 28, Gloucester Street, Cardiff, Fitter, and ALFRED
JAMES PERTON WHITAKER,. of Penarth, Cardiff, Chartered Accountant, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following state-
ment:-
Our invention relates to improvements in lock nuts and refers to that type of
lock nut described in the Specification of British Patent number-5148 of 1897.

page_text: The said specification relates to a split nut having a tapered extension which
is also split, and which is used in conjunction with a washer having a tapered
aperture corresponding to and adapted to receive the said tapered extension, so
that when the nut is screwed up its tapered portion enters the aperture in the
washer and thereby exerts a wedge like action and causes the threads of the nut
to bind tightly into those of the bolt. Or in place of said washer a tapered
aperture to serve the same purpose may be formed in the surface of the plate on
which the nut bears; or such aperture may be formed at one end of another nut
to be used in advance of the split nut.
According to our present invention we employ a split nut having a tapered split
extension as previously described. On the exterior of this tapered extension we
form a screw thread, preferably of finer pitch than that of the nut. Engaging
with this screw threaded tapered extension is a nut having a suitable screw threaded
tapered aperture or bore, so that by screwing up the last mentioned nut the split
nut and extension are caused to contract and firmly grip the bolt.
In order that our invention may be clearly understood and readily carried into
effect we will now proceed to describe the same more fully with reference to the
accompanying drawings in which:-
Figure 1 is a side view and
Figure 2 is a longitudinal section of the lock nut in position on a bolt.
a is the body of the nut, a¹ the tapered extension thereon and a the cut or
division by virtue of which the said nut and extension are enabled to expand or
contract. The extension a¹ has an external screw thread thereon which is prefer-
ably of finer pitch than the thread of the nut a and is adapted to receive a nut b
having a correspondingly tapered and screw threaded bore. When the nut bis
screwed up on the extension a¹ the latter together with the body of the nut a is
caused to contract and bind tightly onto the bolt c.
A nut having a single cut or division through the body of the nut and the
tapered extension is shown in the drawings, but it is obvious that we may use a
nut in which the tapered extension is provided with two or more cuts or divisions,
or in which the body of the nut is not split but only the tapered extension. It
is also obvious that in place of the nut b we may employ a suitably screw threaded
tapered aperture in the plate on which the split nut bears, or a suitably screw
threaded tapered aperture in one end of a second nut to be used in advance of the
split nut,
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
1. A lock nut of the type referred to, in which the tapered extension is exter-
nally screw threaded and adapted to engage with a tapered screw threaded, nut or
its equivalent, for the purpose specified.
2. A lock nut constructed and operating substantially as described with refer-
ence to the accompanying drawing.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicants.