Improvements in Lock Nuts."
Year: 1897

page_text: "Improvements in Lock Nuts."
We, WILLIAM BRENTON, of The East Cornwall Iron Works, Polbathic, St. Germans,
in the county of Cornwall, Agricultural Engineer, and JOHN HENRY NORTHCOTT, of
Amberley House, Plymstock, Devon, Market Gardener, do hereby declare the nature
of this invention to be as follows:-
This invention relates to a novel and simple construction of lock nut.
According to our invention the nut is made in two parts, one of which is provided
with a circular recess eccentric to the screw-threaded hole in the nut, the other part
of the nut being provided with a corresponding eccentric projection which is adapted
to fit into the said recess.
By this arrangement if the two parts of the nut are placed together so that the
screw-threaded holes in the two parts are in alignment, the nut can be screwed home;
then by simply turning one part of the nut on the other, the eccentric projection
will bind or grip in the eccentric recess thereby locking the nut into the position
into which it has been screwed.
Improvements in Lock Nuts.'
We, WILLIAM BRENTON, of The East Cornwall Iron Works, Polbathic, St. Germans,
in the county of Cornwall, Agricultural Engineer, and JOHN HENRY NORTHCOTT, of
Amberley House, Plymstock, Devon, Market Gardener, 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 a novel and simple construction of lock nut.
According to our invention the nut is made in two parts, one of which is provided
with a circular recess eccentric to the screw-threaded hole in the nut, the other part
of the nut being provided with a corresponding eccentric projection which is adapted
to fit into the said recess.
By this arrangement if the two parts of the nut are placed together so that the
screw-threaded holes therein are in alignment, the nut can he screwed home; then if
one part of the nut is turned relatively with the other, either by reason of vibration

page_text: or from any other cause the eccentric projection will bind or grip in the eccentric
recess thereby locking the nut in the position into which it has been screwed.
In the accompanying drawing,
Figure 1 is an elevation of a bolt having a lock nut made according to our invention,
the said lock nut being shewn in section:
Figure 2 is an elevation of one part of the uut :
Figure 3 is an underside view thereof:
Figure 4 is an elevation of the other part of the nut:
Figure 5 is an underside view thereof; and,
Figure 6 is a plan of the nut when locked upon a bolt.
a is the bolt and b and c are the two parts of the lock nut; d is a circular recess
formed in the part of the lock nut, the said recess being made eccentric to the
screw-threaded hole e of the nut.
fis the projection formed upon the underside of the part c of the nut, the said
projection being made eccentric to the hole g through the nut and being made of
such a size that it fits within the recess d in the part 6 of the nut.
With this construction, if the two parts b, c of the nut be placed together so that
the screw-threaded holes in the said two parts are in alignment with one another the
nut can be screwed home; then by simply turning the part c upon the part b, as
shewn in figure 6, the eccentric projection will bind or grip in the eccentric recess
d thereby locking the nut in the position into which it, has been screwed.
In practice we find it advantageous to place a thin washer of leather, india-rubber
or other desirable material between the adjacent surfaces of the two nuts to prevent
them from rusting.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what
we claim is-
1. A lock nut consisting of two parts one of which is provided with a circular recess
eccentric to the screw-threaded hole therethrough and the other with a projection also
eccentric to its screw-threaded hole and adapted to fit into the eccentric recess,
substantially as described.
2. A lock nut consisting of two parts b and c the part 6 being provided with an
eccentric recess and the part c with an eccentric projection f adapted to fit into the
eccentric, recess d, substantially as described.
Dated the 16th day of November 1897
G. F. REDFERN & Co.,
4, South Street, Finsbury, London. Agents for the Applicants.