A New or improved Locking Device for the Nuts of screws.
Year: 1897

page_text: Date of Application, 27th Nov., 1897
Complete Specification Left, 26th Aug., 1898-Accepted, 1st Oct., 1898
A New or improved Locking Device for the Nuts of screws.
I, JAMES CARR, of Perambulator Works, Trafalgar Street, Bradford, in the
County of York, Perambulator Manufacturer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to a new or improved locking device for the nuts of
screws, and its object is to provide a simple means of preventing such nuts being
loosened by vibration.
For this purpose 1 make a radial groove of dovetail cross section in the outer
face of the nut and in this groove I fit a sliding key or wedge. This key may
have a
pointed or Vee shaped end which to lock the nut is driven against the
screw so as to more or less indent a thread or threads and thus lock the nut.
The said key may be split or bifurcated and the split end may be more or less
open so that driving in the key splays out the forked ends on either side as well
as indents a thread or threads.
In any case a projection or head may be formed on the key to facilitate its
withdrawal.
Dated this 26th day of November 1897
DRACUP & NOWELL,
Patent Agents, Bradford.
COMPLETE SPECIFICATION.
A New or Improved Locking Device for the Nuts of Screws.
I, JAMES CARR, of Perambulator Works, Trafalgar Street, Bradford, in the
County of York, Perambulator Manufacturer, 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 new or improved locking device for the uuts of
screws, and its object is to provide a simple means of preventing such nuts being
loosened by vibration.
For this purpose I make a radial groove of dovetail cross section in the outer
face of the nut and in this groove I fit a sliding key or wedge pointed towards
one side, which wedge is driven against the screw so as to more or less indent a
thread or threads to lock the nut.
To fully describe my invention reference is made to the accompanying sheet
of drawings forming a part of this specification, in which similar letters of
reference indicate corresponding parts in each of the figures.

page_text: Figure 1, represents an end view of a bolt with the nut locked thereon.
Figure 2, is a side view of the nut and wedge only. Figure 3, is a side view of
the bolt partly in section with the nut and wedge shown in section thereon.
Figure 4, is a section of the same on the broken line a, b. Figures 5 and 6, are
two separate views of the said wedge or locking piece.
The wedge A is fitted in the dovetail groove B formed in the outer face of the
nut C and the inner end A2 of the wedge is inclined so that when it is driven in
the corner A³ digs into the thread of the bolt and is more or less bent laterally,
as shown in Figure 4, and therefore locks itself in as well as locking the nut.
The groove B may be more conveniently made right across the outer face of the
nut instead of as shown, in this case two wedges A may be used if desired.
my said
Having now particularly described and ascertained the nature of
invention and in what manner the same is to be performed, I declare that what
I claim is
The combination with the nut C of the wedge or locking piece A pointed on
one side, substantially as herein shown and described.
DRACUP & NOWELL,
Patent Agents, Bradford.