Year: 1887

page_text: Date of Application, 8th Mar., 1887
Complete Left, 7th Dec., 1887
Complete Accepted, 13th Jan., 1888
I, STANHOPE DREW BLOGG, of No. 13 Clements Lane in the City of London,
Gentleman, do hereby declare the nature of this invention to be as follows:---
My invention relates to means of locking nuts on the bolts on which they are
screwed, so as to prevent them from becoming loosened and unscrewed by vibration.
For this purpose, I provide across the face of the nut a slot in such a position that
one side of the slot is open to the internal hole of the nut. When the nut is screwed
upon the bolt I drive into this slot a pin which in crossing the thread of the bolt
partly deforms it and so renders that part of the bolt thread a misfit to the nut thread.
In many cases a taper punch driven into the slot sufficiently deforms the thread, the
punch itself being removed. In order to economise labour in forming the cross slot,
it. may be cut in a prominence standing up from the face of the nut but not extending
across it, or it may be formed by the die in the act of forging the nut.
Dated this 8th day of March 1887
ABEL & IMRAY,
Agents for the Applicant.

page_text: I, STANHOPE DREW BLOGG of No. 13 Clements Lane in the City of London
Gentleman, 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 :-
My invention relates to means of locking nuts on the bolts on which they are
screwed so as to prevent them from becoming loosened and unscrewed by vibration.
For this purpose, I provide across the face of the nut a slot in such a position that
one side of the slot is open to the internal hole of the nut. When the nut is screwed
upon the bolt, I drive into this slot a pin which in crossing the thread of the bolt
partly deforms it, and so renders that part of the bolt thread a misfit to the nut
thread. In many cases a taper punch driven into the slot sufficiently deforms the
thread, the punch itself being removed.
Fig. 1 is a plan and Fig. 2 is an elevation of a lock nut according to my invention
having a slot cut or formed in its face, so that when the nut is screwed up a punch
being driven into this slot will to a certain extent deform the screw thread and thus
prevent the nut from unscrewing.
The slot is preferably made as shewn with its bottom somewhat inclined in
correspondence with the inclination of the screw thread. Fig. 3 is a plan and Fig. 4
is an elevation of a lock nut having the slot in its face undercut so as the better to
retain a pin driven into the slot after the nut is screwed up. In order to prevent
the pin thus driven in from loosening out lengthwise, its end may be bent as shown
in Fig. 3. The slot may be sawn or planed out after the nut is forged, or when the
slot is made as shewn in Figs. 1 and 2 without undercutting, it may be formed by
the dye in the act of forging the nut.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
A lock nut having formed in its face a slot such that a punch or pin driven along
it partly deforms the screw thread, to prevent loosening of the nut, substantially as
described.
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