Year: 1892

page_text: Date of Application, 2nd Jan., 1892
Complete Specification Left, 29th Sept., 1892-Accepted, 29th Oct., 18 2
тргоѵешенении нушын
I, LORENZO WILLIAM CROSTA of 3 Park Avenue, West Bridgeford in the
County of Nottingham, Mechanical Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements in the means for locking nuts on screwed
bolts rods or the like.
In carrying out this invention the nut is formed at its upper or outer part with a
cut or division preferably extending diametrically across it at a slight angle or
parallel with the axis of the bolt, rod or the like and extending to a suitable depth
so as to partially divide the nut.
The division may be made by cutting or sawing the nut, or the nuts may be
made from bars bent into a form approximating in section to the letter Ų until
preferably the two inner surfaces meet or form bars rolled or drawn with a longi-
tudinal channel or recess on one side the two sides of which channel or recess are
brought preferably close together in the finishing process.
Before punching and tapping the nut one of the halves or portions of the upper
or outer part of the nut formed by the division is pressed forced or bent over in
the direction of the division or across the other part and after the nut has been
punched and tapped is returned to its original position.
This will cause the portion of the hole in one half of the upper or outer part of
the nut to be eccentric with that in the other part and inclined to about half the
depth of the nut to the axis of the bolt, rod or the like and the corresponding part of
the hole in the other half.
When the nut is screwed on to the bolt rod or the like, that part of the hole in
the upper or outer part of the nut which is inclined to the axis of the bolt will be
forced to assume a position parallel to the axis thereof and to its opposite part and
the cross spring of the two halves of the upper or outer part of the nut acting on
the bolt will grip it and ensure the nut locking on the bolt and prevent it from
being worked loose by vibration or other accidental causes.
By bending over one half of the upper part of the nut in the manner herein-
before described each half of the hole at the upper part of the nut where divided
will present one sharp or cutting edge to the bolt when turned in one direction and
it is desirable that the upper part of the nut be bent in such a direction with respect
to its other part that the cutting edge will operate and act so as to prevent the
unscrewing of the nut.
Alternatively the nut may be first punched and tapped and one half of the upper
part of the nut bent over by a subsequent operation in which case the exterior of
the nut may be dressed to remove inequalities caused by such bending over.
Dated this 2nd day of January 1892
W. P. THOMPSON & BOULT,
Agents for the Applicant.

page_text: *
COMPLETE SPECIFICATION.
Improvements in Nut Locking Devices.
1, LORENZO WILLIAM CROSTA of 3 Park Avenue, West Bridgeford, in the
County of Nottingham, Mechanical 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 improvements in the means for locking nuts on screwed
bolts, rods or the like and it will be best understood by reference to the accom-
panying drawings in which
Fig. 1 is an elevation
Fig. 2 is a plan and
Fig. 3 is a cross section showing a square nut constructed according to my
invention.
Figs. 4 and 5 are elevations and
Fig. 6 is a plan of a hexagon nut constructed according to my invention.
In Fig. 4 the nut is shown in connection with a bolt.
Like letters indicate like parts throughout the drawings.
In carrying out this invention the upper or outer part of the nut is divided by a
cut or division a preferably extending as shown diametrically across it, at a slight
angle or parallel with the axis of the nut, and extending to a suitable depth. The
division a may be made by cutting or sawing the nut or the nut may be made from
a bar bent into a form approximating in section to the letter U until preferably the
two inner surfaces meet, or from a bar rolled or drawn with a longitudinal channel
or recess on one side, the two sides of which channel or recess are brought preferably
close together in the finishing process.
Before punching and tapping the nut one of the halves or portions of the upper
or outer parts of the nut formed by making the cut or division a, is pressed forced
or bent over in the direction of the cut or division a or across the other part 6' as
shown in dotted lines in Figs. 2 and 6 and after the nut has been punched and
tapped is returned to its original position. This will cause the portion of the hole
in one of the upper or outer parts of the nut 6 to be eccentric with that in the other
part 6 and inclined to about half the depth of the nut with its axis and the corre
sponding part of the hole in the other part.
When the nut is screwed on to a bolt rod or the like that part of the hole
in the upper or outer part 6 of the nut which is inclined to the axis of the nut
will be forced to assume a position parallel to the axis of the bolt and to its opposite
part and the cross spring of the two upper or outer parts 6 61 of the nut acting on
the bolt will grip it and ensure the nut locking on the bolt and prevent it from
being worked loose by vibration or other accidental causes.
By bending over one part 6 of the upper or outer part of the nut in the manner
herein before described each half of the hole at the upper or outer part of the nut
where divided will present a sharp or cutting edge to the bolt when turned in
one direction and it is desirable that the part 6 of the nut be bent in such a
direction with respect to its other part that the cutting edge will operate so as to
prevent the unscrewing of the nut as shown.
Alternately the nut may be first punched and tapped and one part 6 of the
upper or outer part of the nut bent over by a subsequent operation, in which case
the exterior of the nut may be dressed to remove inequalities caused by such
bending over.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A nut partially divided by a cut or division such as a forming parts such

page_text: as 6 b¹ in each of which a portion of the hole is formed that portion contained in
part b being eccentric with that in part 6' substantially as and for the purpose
described and illustrated in the accompanying drawings.
2. A nut partially divided by a cut or division such as a forming parts such
as b b in each of which a portion of the hole is formed that portion contained in
part b being eccentric with that in part 6' so as to present sharp or cutting edges c
to the bolt substantially as and for the purpose described and illustrated in the
accompanying drawings.
3. A nut constructed substantially as herein described and illustrated in the
accompanying drawings.
Dated this 25th day of September 1892.
LORENZO WILLIAM CROSTA.
W. P. Thompson & Boult,
Agents for the Applicant.