Improvements in Locking Devices for Screws, Nuts, Bolts, Wedges, and the like..
Year: 1889

page_text: Date of Application, 3rd Dec., 1889
Complete Specification Left, 3rd Sept., 1890-Accepted. 18th Oct. 1890
PROVISIONAL SPECIFICATION.
Improvements in Locking Devices for Screws, Nuts, Bolts, Wedges,
and the like..
I, ALBERT CHRISTIAN GRÜNWALD of Jastrow, in the Empire of Germany, Lock-
smith, do hereby declare the nature of my said invention to be as follows:
This invention relates to an improved locking device for screws, nuts, bolts, wedges
and the like.
In applying this invention to a screw bolt and nut I perforate the bolt longitudinally,
the hole tapering slightly from the threaded end towards the head, and slot or split
the threaded end. When the bolt is in place and the nut screwed home a pin corre-
sponding in shape to the hole in the bolt and somewhat longer than the latter is
inserted in the perforation.
The taper end of this pin is screwthreaded and projects from the head of the bolt.
When the nut has been drawn tight a slight blow from a hammer drives the pin
home, spreading the split end of the bolt and a small nut is then screwed upon the
threaded end of the pin.
When this invention is applied to say the key of a connecting rod, or to a wedge, the
key is perforated and its end split the pin being driven in as above described. In
some cases I may dispense with the nut at the end of the pin.
Dated this 3rd day of December 1889.
BERNHARD DUKES,
226, High Holborn, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Locking Devices for Screws, Nuts, Bolts, Wedges,
and the like.
1 ALBERT CHRISTIAN GRUNWALD Locksmith of Jastrow German Empire 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 an improved locking device for screws, nuts, bolts keys and
wedges. It is very simple and prevents loosening by shocks or jarring.
It is illustrated in the accompanying drawings in which
Figs. 1, 2, 3 and 4 show the application to screw nuts such as employed for fish
plates see Fig. 5.
Fig. 6 shows the application to a screw-bolt.
Figs. 7 & 8 show the application to un-headed screws and to pins and
Fig. 9 to a key or wedge.
The locking device consists in a pin A with a taper end a inserted into a perfora-
tion B of the bolt or the like; this pin when the screw is tightened or the bolt or the
like driven home will spread the split part 6 of the same and keeps it so spread
and by this means the bolt B or nut C is securely locked. When the invention
is applied to nuts the locking pin is driven home by lightly tapping it with a
hammer and tightening up the nut d. When the nut d is tightened the nut C is
further secured as this operation causes the taper end a of the pin A to penetrate
further into the hole in the bolt B and this further spreads the split end b. When
however the nut d is released and pin A is entirely or even partly raised the
split part closes up by its own elasticity and allows the nut C to be screwed
back and thus to be easily and readily removed as will appear from Figs. 1, 2, 3
and 4.

page_text: In applying this invention for purposes such as illustrated in Figs. 6, 7 and 8,
the pin is inserted into the perforation provided therefor before the screw pin or
bolt is put into place, when the latter is screwed or driven home the end of the
locking pin bears against the bottom of the hole into which the screw or the like
is inserted and as this enters further into said hole the locking pin drives the split
portions apart and against the sides of the hole.
The nut d for the bolt A is, in this form of my invention, dispensed with.
For keys and wedges the application is analogous to that for nuts as readily appears
from Fig. 9.
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,
An improved locking device for screws, nuts, bolts, and the like consisting in a pin
having a tapering end, applied, secured, and operating in conjunction with the split
end of the bolt pin or key within which it is inserted, as set forth and illustrated in
the drawings.
Dated this 2nd day of Santomahar 1800.
BERNHARD DUKES,
226, High Holborn, London, W.C., Agent for the Applicant.