Locking Nut and Bolt.
Year: 1895

page_text: Date of Application, 19th Aug., 1895-Accepted, 12th Oct., 1895
We, THE HUNGARIA
Locking Nut and Bolt.
ARTIFICIAL
MANURE SULPHURIC ACID AND
CHEMICALS INDUSTRIAL COMPANY and IGNAÉZ ADLER, Engineer, both of
Budapesth Hungary in the Austrian Empire do hereby declare the nature of our
said invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :-
The object of this invention is a locking nut and screw bolt forming a secure
connection capable of withstanding the greatest shocks and vibrations.
This locking arrangement is shown in the accompanying drawings wherein
Fig. 1 is a side view and a plan of the locking devices without cap.
Fig. 2. shows the arrangenient in longitudinal section, an open cap being placed
in position.
Fig. 2 shows the same arrangement in longitudinal section with a closed cap in
position.
Fig. 3 shows the locking devices in side view furnished with a protecting cap.
Fig. 4 shows a key or spanner for loosening the locking devices.
The upper end of the bolt a is provided with two opposite longitudinal grooves b
and upon this bolt fits the nut c which has an extension c¹ furnished with three axial
inner grooves d uniformly divided and split along the grooves d so that the split
collar formed thereby may be somewhat flexible. The grooves b of the bolt a and
those of the extension c¹ of the nut come opposite one another at each sixth part of
a turn and form a common opening wherein a wedge e is inserted the latter thus
fixing the position of the nut c while a portion of the upper thread of the same is
pressed against the corresponding thread of the bolt a in consequence of the
flexibility of the split extension c¹ a tensile strain occurring between the threads
which secures the bolt and nut in their relative position.
The wedge e is but very slightly tapered and remains in its position notwith-
standing shocks or vibrations.
To loosen this fixed connection the bent end of the tool (Fig. 4) is made to
engage under the wedge e and the latter is subsequently extracted, this tool can be
used at the same time to knock the wedge in and to screw the nut on.
When a connection has to be made in such a manner that it should withstand the
greatest possible strains, for instance for bolting some of the iron bars used in
the connecting or jointing of such parts of bridges or girders and the like,
the extension c is likewise screw threaded on its outer periphery and an open or
closed cap g (Figures 2 and 2ª) is screwed thereon until the the bearing surface h
of the same firmly tightens the wedge e.
The cap 9 can also be screwed lightly on the split extension or collar c¹ in
ordinary cases so as to remain somewhat loose but as soon as the wedge e is driven
home the cap is moved very steadily on to the corresponding thread without any
stoppage and in consequence of the friction developed between the threads this
cap g is firmly secured in position.
Where only an ordinary bolt locking arrangement is required the open cap
(Figure 2) may be used but where in order to facilitate the loosening of the
connection it is desired to protect the end of the bolt from external or atmospheric
influences such as rust the close cap g Figure 2 is preferably used.
It is obvious that the number of grooves in the bolt and the nut may be varied
without departing from the nature of the invention.

page_text: 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 :-
1. A screw bolt locking connection characterized by longitudinal grooves b
formed in the bolt and similar grooves d formed in the upper cylindrical extension c¹
of the nut c which extension is split along these grooves as well as by a wedge e
driven within two grooves when coinciding in order to tightly lock the screw
connection.
2. In the screw bolt locking connection of the kind above claimed the use
of outer-threads formed on the extension of the bolt coupon which can be
screwed an open or close cap 'g firmly securing the wedge e means of an inner
circular surface or shoulder h.
Dated this 17th day of Avơnst 1895.
GEORGE BARKER,
77 Colmore Row, Birmingham, Agent for Applicants.