Improvements in Nuts for Screwed Bolts and the like.
Year: 1893

page_text: Date of Application, 6th July, 1893
Complete Specification Left, 4th May, 1894-Accepted, 9th June, 1894
PROVISIONAL SPECIFICATION.
Improvements in Nuts for Screwed Bolts and the like.
CHARLES WILLIAM HOLLIS Engineer of 33 Glasshouse Street Nottingham
and SAMUEL WINFIELD BANNISTER Engineer of 7 Colwick Street Nottingham
do hereby declare the nature of this invention to be as follows :-
A nut so formed as to automatically grip or lock itself upon the screwed bolt,
stud etc. to which it is applied.
This is obtained by making a slot from one side about three-fourths through the
nut at right angles to two sides & diagonally with the top and bottom faces; or
the slot may be made diagonally with the top and bottom faces but not at right
angles to the sides.
After the nut is tapped, the upper and lower parts of the nut are slightly
displaced by pressing the aforesaid parts together or by pushing them asunder, the
part not cut through forming a spring so that the nut cannot be screwed upon the bolt
without the upper & lower parts being at tension & thus forming a lock or grip on
the bolt.
In place of one diagonal slot as above, two or more may be used to give additional
spring or grip.
By another method we purpose slitting the nut parallel with and about half way
between the upper and lower faces nearly across same. After the nut is tapped,
the upper & lower parts are slightly pressed in opposite directions but parallel with
two sides in such manner as to make the tapped hole of one half eccentric with the
other half & thus forming a spring in opposite directions when bolt is screwed
into nut.
Dated this Fifth day of July 1893.
CHARLES WILLIAM HOLLIS.
SAMUEL WINFIELD BANNISTER.
COMPLETE SPECIFICATION.
Improvements in Nuts for Screwed Bolts and the like.
CHARLES WILLIAM HOLLIS Engineer of 33 Glasshouse Street Nottingham
and SAMUEL WINFIELD BANNISTER Engineer of 7 Colwick Street Nottingham
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 :-
In so forming a nut as to automatically grip or lock itself upon the screwed bolt,
stud, etc. to which it is applied.
This is obtained by making a slit from one side about three-fourths through
the nut, at right angles to two sides, and diagonally with the top and bottom faces.
After the slit is made by sawing or other means, the nut is tapped and the upper
& lower parts of the nuts are slightly displaced by pressing the aforesaid parts
together, or by pushing them asunder.
The part of nut at end of slit left solid forms a spring in such manner, that the nut
cannot be screwed upon bolt without the upper and lower parts being displaced
and at tension, thus forming a lock or grip on the bolt.
Fig. 1 and 2 is plan and elevation of a nut diagonally cut, tapped, and the upper
& lower parts afterwards pressed together.

page_text: Fig. 3 and 4 is plan and elevation of a nut diagonally cut, tapped, and the upper
and lower parts afterwards pushed asunder.
Fig. 5 and 6 is plan and elevation of a nut diagonally cut, tapped, and the upper
and lower parts displaced by pressing them together and afterwards in opposite
directions, the latter operation forming an additional lock, by making the tapped
hole in the upper & lower parts eccentric with each other.
In Figs. 1, 3, and 5 the slit is shewn diagonally with the top and bottom faces
and at right angles with two sides, but slit may also be made at any angle as
shewn in plan and elevation Figs. 7 and 8 or two or more slits as shewn in Figs. 9
and 10; in the latter arrangement the solid part across centre of nut forming the
spring and the outer edges being pressed or forced asunder as shewn in
Figs. 1, 3, and 5.
By another method we purpose slitting the nut parallel with, and by preference
about half way between the upper and lower faces nearly across same. After the
nut is tapped, the upper and lower parts are pressed in opposite directions but
parallel with two sides, in such manner as to make the tapped hole of one half
eccentric with the tapped hole of the other half & thus forming a spring or tension
in opposite directions when bolt is screwed into nut.
The figures in the annexed sheet of drawings shew all square nuts, but the same
arrangement of slit & displacement of upper and lower parts may be applied to
hexagonal or other shaped nuts.
The elasticity of the aforesaid upper and lower parts may be increased or
decreased by the amount of metal left at the end of slit, or by the amount pressed,
extended or twisted as clearly shewn by Figs. 1, 3, 6 and 11 of the annexed sheet
of drawings.
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 :
The combination & arrangement by so slitting a nut & displacing the upper and
lower parts substantially as hereinbefore described and illustrated by Figs. 1 to 12
inclusive of the drawings, as to automatically grip or lock itself upon the screwed
bolt or stud to which it is applied.
Dated this Sixth day of April 1894.
CHARLES WILLIAM HOLLIS.
SAMUEL WINFIELD BANNISTER.