Improvements in Nutlocks.
Year: 1888

page_text: Date of Application, 24th Nov., 1888
Complete Specification Left, 24th Aug., 1889-Accepted; 28th Sept., 1889
PROVISIONAL SPECIFICATION.
Improvements in Nutlocks.
We THOMAS WILKINSON WILLIS, Secretary, and JOSEPH TUXFORD, Secretary,
both of Bruce Works Mowbray Street, Sheffield in the County of York do hereby
declare the nature of this invention to be as follows:-
This invention relates to a simple and effective means of securing or locking nuts
upon their bolts or pins, such nuts and bolts being either with or without the usual
screwthread.
In carrying out our invention in its application to an ordinary screwed bolt for
example, we take the nut, and form (either before or after the screwthreads are cut
or tapped) a groove passing through or across the threads from one side of the nut
to the other, that is from face to face.
The groove is deepest at one side and runs gradually out on the other side to the
top of the screw threads, and we provide a pin preferably of steel and of tapered
form, that can be passed into the deepest side of the groove and through the nut
when it is screwed upon the bolt.
When the nut is screwed upon the bolt to the desired position, the tapered pin is
passed into the opening formed by the beforementioned groove, and may be secured
or fixed by a slight blow, or by a backward movement of the nut; any unscrewing
movement of the nut causes the pin to be drawn into the shallower part of the groove,
and to be compressed between the bottom of the groove on the nut and the top of
the threads of the bolt, and thus effectually prevents the unscrewing of the nut.
The same groove and pin may be applied to a stud or unscrewed bolt, and an
untapped nut, with a similar result.
For some purposes if desirable, we may use a groove somewhat similar to that
described above, and make the pin with a cross section of oval, oblong, or other
like shape, so that when placed in the groove between the nut and the bolt it may
be partly turned round, and the projecting end bent over on the flat side of the nut, thus
firmly binding the nut to the bolt.
Dated the 22nd day of November 1888.
ROBT. F. DRURY,
Agent for Applicants.
COMPLETE SPECIFICATION.
Improvements in Nutlocks.
We THOMAS WILKINSON WILLIS, Secretary, and JOSEPH TUXFORD, Secretary,
both of Bruce Works, Mowbray Street, Sheffield, in the County of York, 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 simple and effective means for securing or locking
nuts upon their bolts, or screws, or pins, such nuts and bolts being either with or
without the usual screw thread.
The annexed sheet of drawings, shows its application to a screw bolt of ordinary
make.
Fig. 1, is a plan of a nut upon its bolt, with the locking pin in position before
locking.
Fig. 2, similar plan showing the position of pin when the nut is locked.

page_text: In carrying out our invention in its application to an ordinary screwed bolt for
example such as shown in Fig. 4, we take the nut A either before or after the screw-
threads are cut by tapping or otherwise, and we form by any suitable means, a
groove B in the interior of the nut, and passing across the threads (if any) from
one side of the nut to the other, or in other words, through the nut from face to
face.
The said groove is made deep at one side, and becomes shallower, or runs gradually
out on the other side to the top of the screwthreads, forming an incline; and when
the nut is screwed upon the bolt, it forms a hole wide at one side and gradually
narrowing to the other.
We provide a pin C shown in Fig. 3, and preferably made of steel and of a tapered
form, that can be passed readily into the largest side of the hole formed by the groove
when it is screwed upon the bolt, as seen in Fig. 4.
When a nut such as A, screwed upon a bolt such as D, is to be locked in any desired
position, a tapered pin such as C, is passed into the opening made by the groove B,
and may be secured or fixed by a slight blow from a hammer, or by a backward
movement or turn of the nut.
Any unscrewing movement of the nut causes the pin C to be drawn into the
narrower part of the opening or groove, and to be compressed between the bottom of
the groove in the nut, and the threads of the bolt, as seen in Fig. 2, and effectually
prevents any further movement in that direction.
The position of the pin before attempting to unscrew the nut is shown in Fig. 1-
and its position when locking the nut caused by an attempt to unscrew the nut, is
shown in Fig. 2.
In some cases we use the groove as before described, and make the locking pin of
an oblong, oval, or other like shape in cross section, so that when placed in the groove
between the nut and the bolt, it can be tightened against each object by forcing
it partly round so as to bring its greatest width between the said objects.
To further secure the pin in this position it may be made long enough for one
or both of its projecting ends to be turned over or bent against the flat of the nut.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same may be performed, we declare that what we
claim is :-
1-A nut having a groove formed across its internal face, the base of the groove
being inclined transversaly for the purpose of acting upon a locking pin, substantially
in the manner specified, and as herein before described and illustrated.
2-The combination of a bolt or pin D, a nut A, a groove B, and a pin C, for
the purpose specified, and arranged substantially as bereinbefore described and
illustrated.
Dated the 21st day of August 1889