IMPROVEMENTS IN LOCK NUTS
Year: 1884

page_text: ་་
PROVISIONAL SPECIFICATION,
I SAMUEL ARNOLD of 18 Bartholomew Road, Kentish Town in the county of
Middlesex, Agricultural Engineer do hereby declaro the naturo of the said invention
for "IMPROVEMENTS IN LOCK NUTS" to be as follows:-
My invention relates to improvements in lock-nuts for screw-bolts and the
invention consists in forming the nut in two parts one part screwing on the other
part in an opposite direction to that in which the nut is screwed onto the bolt.
In carrying out my invention I construct one of the parts of the nut with a male
screw thread the thread running in an opposito direction to the usual interior or
female thread of the nut the other part of the nut is formed with a female screw
thread corresponding with the said male thread.
To apply a lock-nut of this construction, the two parts of the nut are screwed
together and the nut is screwed over the bolt in the usual manner by means of a
spanner or otherwise and as soon as the nut has been screwed home it becomes
automatically locked or may be locked by slightly screwing one part of the nut on
the other.
A bole or notch may be provided in either part of the nut for the purpose of
lubrication between the parts of the nut.

page_text: COMPLETE SPECIFICATION.
"
I SAMUEL ARNOLD of 18 Bartholomew Road, Kentish Town, in the County of
Middlesex Agricultural Engineer do hereby declare the nature of the 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:
My invention relates to improvements in lock-nuts for screw bolts and the
invention consiste in forming the nut in two-parts-one-part screwing on the other
part in an opposite direction to that in which the uut-is-screwed on to the bolt.
In carrying out my invention I construct one of the parts of the nut with a male-
screw thread, the thread running in an opposite direction to the usual interior or
female thread of the nut, the other part of the nut is formed with a female screw
thread corresponding with the-said-male-thread.
A hole or notch may be provided in either part of the-nut-for-the purpose of
Jubrication between the parts of the nut.
In order to enable-my invention to be fully understood I will proceed to describe
the same by reference to the accompanying-drawing_in_which, figures 1 and 2,
represent elevations of the two parts of a lock-nut constructed according-to-my-
invention; figures 3 and 4, sections of figures 1 and 2; figure 5, plan of the nut;
figures 6 and 7, elevations shewing the nut applied to a screw bolt, and figure 8, is
a view shewing the nut applied to a bolt for bolting together two flanges; figures 9
and 10, are elevations of a modified form of the parts of the lock nut; figures 11
and 12 sections of the same; figures 13 and 14, sections of the parts of a lock-nut
formed with lubricating spaces; figures 15 and 16, are elevations of the same and
figure 17 a plan of the nut.-Similar letters in all the figures represent similar or
corresponding parts.
I will first describe my invention by reference to figures 1 to 8.
a and b are the two parts of the lock-nut; a is the male screw thread formed on
the upper part a of the nut such thread running in the opposite direction to that of
the usual female thread & which is cut or formed in both parts of the nut ;-
e is the female thread in the lower part b of the nut, such thread e corresponding
with the male thread c.
To make use of a lock-nut of this construction, the part a of the nut is screwed
into the part b thereof, and when the two parts are brought together or nearly
together so that the thread din both parts of the nut together form a continuous
female thread (and which will be seen by suitable marks such as those shown
at, coming opposite one another), the nut is screwed on a screw bolt f as shewn
at figure 6, and when the nut is screwed home the same will become automatically
locked, or may be locked by slightly sorewing the upper part a of the nut on the
other part 6 as shown in figures 7 and 8.
b
The lock-nut shewn in figures 9, 10, 11 and 12, is substantially the same in
construction and action as that shown in figures 1 to 8 except that the female
screw thread e, passes right through the lower part 6 of the nut, the usual female
thread & of the nut being formed in the upper part a of the nut only,

page_text: In the nut shown in figures 13, 14, 15, 16 and 17, the female thread e is formed
on the upper portion a of the nut and the male thread c on the lower portion b of
the nut; in this arrangement the upper part a of the nut is shewn slotted or cut
away at g, g, to allow of introducing a lubricant between the parts of the nut. It
will be obvious that the lower part of the nut could be slotted for this purpose
instead of the upper part, also that the nut shown in the other figures of the
drawing could be thus slotted.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I declare that what
I claim is
1. A lock-nut formed in two parts, one part screwing into the other part in an
opposite direction to that in which the nut screws onto a screw bolt as herein before
described.
2. The manufacture and use of the improved lock-nuts herein before described
and represented in the various figures of the accompanying drawing.
Dated the 24th day of April 1885.
G. F. REDFERN,
4, South Street, Finsbury, London,
Agent for the Applicant.