IMPROVE- KRAG TAT
Year: 1883

page_text: 11
LETTERS PATENT to Gustavus Baron de Overbeck of N° 23 Ryder Street,
Saint James's in the County of Middlesex for an Invention of "IMPROVE-
KRAG TAT
DYNE Ha
תת
DH"
"
PROVISIONAL SPECIFICATION left by the said Gustavus Baron de
Overbeck at the Office of the Commissioners of Patents on the 10th July
1883.
GUSTAVUS BARON DE OVERBECK of N° 23 Ryder Street, Saint James's in the
County of Middlesex
"
"IMPROVEMENTS IN BREECH LOADING REPEATING RIFLES
AND FIRE ARMS
"
The Chamber Figure I. is hollowed out cylindrically lengthwise and has an
opening on its right side which contracts towards the hinder end to a slit
Figure 2.
III
III
The under structure thereby formed Figure 3 serves as a bed for the breech
bolt.
II
On its under side the chamber is pierced with an oval opening Figure 4 which
allows of the passage of the cartridges from the magazine into the chamber.
II
III
III'
III
The part Figure 5 has at its end a projection Figure 6 which serves. for
securing the breech-bolt-lever Figure 7 by means of the pivot pin Figure 8.
The outer form of the chamber is seen in the drawing Figure H. Behind the
part 5 is placed the opening for the trigger Figure 9 as also the space for the
trigger spring Figure 11 which is made fast by the screw 10.
·
IV
11
II
The chamber is made fast-to the stock by the breech screw Figure 12.
Price 10

page_text: The breech bolt is shaped similarly to the Gras breech bolt but allows of only a
small movement and is therefore fitted with the cocking triangle.
III
The ledge Figure 13 widens out into an arched projecting piece, with a
projection bent outwards which is intended to completely cover the slit in the
chamber when the breech is shut.
III*
The knob Figure 14 serves to catch hold of during the back and forward
movement of the breech lever.
III
On the right side of the breech bolt head piece, a peg-working peg Figure 15
is screwed in, and is moveable up and down, and which when the breech-bolt
moves slides backwards and forwards along the side of the chamber, and serves the
purpose of putting the magazine screw Figure 16 in rotation, upon a backward
movement of the breech-bolt.
II
The bedding-groove for the stopscrew as also the trigger are fitted similarly to
other breech cylinders. The fastening of the working-peg on the breech bolt head
piece is effected from outside when the breech is put together.
By pushing the working-peg upwards the repeating mechanism is thrown out
gear for in this position the peg, no longer reaches the screw and cannot set it
in motion,
of
The contrivance for withdrawal
This consists of (a) The trigger spring 11 with the stud 17. (b.) The trigger-lever
Figure 18.
V
The trigger-lever is fastened on to the trigger spring; by, the joint Figure 19 so
as to be capable of turning.
1
The trigger spring which bends out of the straight line under a projection on
the right has on this cross-arm the tooth of the support 20 which serves to hold
the hammer at full-cock, which. by means of the above mentioned opening through
the bottom of the chamber catches on to the bed of the breech-butt.
The trigger lever 18 has a curved prolongation which abuts against the tail-piece
of; the chamber and which upon taking hold of the lever-arm effects the backward
movement or cocking of the trigger spring by the sliding of its curved side along
the under side of the chamber.
III
The breech-lever is a lever having two arms Figure 7 which as above described
is fastened on to the cheek piece of the chamber by the pivot-pin 14 and the one
arm of which is bent steeply upwards and divides into a double tongued closed
fork 21 while the other longer arm takes the place of a holding-bow, and is shaped
accordingly.
VIII
O
(c) The loading-cap with the turning pin belonging thereto Figure 23.
(a) The screw is shaped as shewn in the drawing and has five right 'handed
turns of somewhat greater pitch than the length of a cartridge. At the hinder
end is the axis Figure 24 furnished with a handle, while the forward end of the
screw terminates as smaller cylinder on whose outer surface there is a screw-thread
cut in the reverse direction to the first screw.
IX
IX
This screw is able to turn in bearings 26 on the cover plate 22.
Into the screw thread Figure IX the stud 15 fastened on to the breech bolt,
catches when the breech-bolt is moved backwards, and effects the turning of the
screw by its sliding backwards, along, the, screw thread,

page_text: VIII
VIII
The closing plate.-This consists of the rectangular plate Figure 23 formed
out of the heel plate Figure VII and the turning pin Figure 27 which serves
at the same time for the fastening of the heel plate into the shaft of the butt.
In the same way a slide on the left-hand side of the buttshaft, working in the
wood, can be used as a loading appliance 28.
I
Magazine. The butt is hollowed out to the length of 2 cartridges and the height
of 4 cartridges, which hollow space is continued in a cylindrical form through the
neck of the stock to a point under the chamber.
Working. On drawing back the breech bolt the peg of the breech head 15.
catches into the screw-thread 16 of the prolongation of the screw, and slides back
in the same by which it forces the screw to make a revolution of 360°. Since the
thread of the prolongation of the screw is in the reverse direction to the turn of
the screw itself, the cartridges which are lying on the screw, must be forced
forward, upon a full backward movement of the breech bolt, by one entire turn of
the screw, that is, one cartridge length. The back and forward movement of the
bolt is effected by a back and forward movement of the breech lever in the forked
arm of which, the peg of the bolt slides. The breech-lever therefore takes the
place of the holding bow.
The loading is effected by the introduction of a full carton, whose lower side
is first torn away, into the magazine, during which operation the gun must be
held breech downwards, and the loading cap or slide must be correspondingly
opened.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent and of
an Order of the Lord Chancellor filed by the said Gustavus Baron de
Overbeck in the Patent Office on the 18th January 1884.
M
GUSTAVUS BARON DE OVERBECK of N° 23 Ryder Street, Saint James's in the
County of Middlesex "IMPROVEMENTS IN BREECH LOADING REPEATING RIFLES
AND FIRE ARMS
"
This repeating gun which can also be used as a single loader, has a magazine
arranged in the butt out of which the cartridges are, upon the opening of the breech
forwarded into the loading space by means of a forwarding screw running through
the butt and neck of the stock. The motion of this forwarding screw about its
longitudinal axis is brought about by a link piece placed along the wall of the
breech chamber and furnished with a projecting tooth or nut. This link piece is
connected with the breech bolt and its projection slides in a partly straight and
partly spiral groove in the forwarding screw in such a manner that upon the
opening of the breech the forwarding screw is caused to make one complete
revolution from right to left and upon the closing of the breech to remain at rest.
By this arrangement every cartridge upon the forwarding screw is carried
forward by one entire cartridge length towards the loading space upon the opening
of the breech while upon the closing thereof it remains in the position thus reached.
In order to bring about the opening of the breech a two-armed lever is fixed on
the right hand side of the gun having its fulcrum on the trigger plate. One arm
serves as a handle and forms the trigger guard and holding bow while the other
arm is furnished with a slot in which the projecting handle of the breech bolt rests.
By means of this contrivance the feather of the breech bolt is raised from its
resting place and the breech bolt itself is simultaneously moved backwards by a
downward pressure of that arm of the lever which serves as a handle. In like
manner upon raising the lever arm again to its original position the breech bolt is
forced forward until its feather drops into the slot in the wall of the breech
chamber whereby the locking of the breech is effected.
Any gun having a cylindrical breech can be readily converted into a repeating
gun upon this system.
In the annexed drawing this new repeating gun is shewn in a general view in
Figure 1 with closed breech and cocked, while Figures 2 to 11 represent details.
To load the magazine the cartridges together with the usual carton, are, after
unfastening the breech feather, placed in the magazine B in the butt which can be
closed by the cover C. In order to utilise the space in the neck of the stock
cartridges may if time permit be placed therein and moved forwards by the play of
the breech mechanism until the space in the neck of the stock is filled.
Instead of inserting the carton A from the side it may be introduced at the end
of the butt and in that case there is an opening in the butt at the end which can
be closed by the flap like butt cap D Figure 11.
When the magazine is filled the gun is in readiness for firing as shewn in
Figure 1.
By pressing the trigger E the cartridge in the barrel will be exploded. By
pressing down the holding bow a (see position shewn by dotted lines in Figure 1)
the feather b of the breech bolt is raised by the lever F out of the slot in the wall
of the breech chamber and the whole breech bolt is simultaneously forced
backwards whereby the cartridge is withdrawn by the extractor in the usual way
and thrown out. At the same time the projection C on the breech bolt head strikes
against the tooth or peg d of the slide G (Figures 2 and 6). This slide as well as

page_text: its tooth is movable in a slot e in the wall of the breech chamber and possesses a
link piece f turning on a pivot and provided with a projection g (Figures 2 and 6)
This projection gcatches when the breech is closed into the spiral groove /
(Figures 7. 8 and 9) of the forwarding screw H which itself turns on the axes or
gudgeons i. i.
Upon the return movement of the slide G by means of the projection con the
breech bolt head the projection g of the link piece f slides in the groove h of the
fowarding screw and thereby causes it to make one complete revolution whereby
in turn the whole series of cartridges in the magazine is carried forward one
cartridge length.
The foremost cartridge I now passes through the open bottom of the breech
chamber into the space where cartridges are usually inserted and upon the closing
of the breech is caught by the breech bolt and thrust forward into the loading
space. When the breech is fully open and the projection g has passed along the
spiral groove h it drops upon the flat and straight groove or plane j (Figures 7, 8
and 9). Upon the closing of the breech the nut k on the feather of the breech
bolt presses against the tooth d of the slide and thus causes it to move forward.
The projection g of the link piece slides on the plane j of the forwarding screw H
so that the latter remains at rest. When the breech is completely closed (which
as above mentioned is effected by the return movement of the holding bow a and
the forward movement of the lever arm F caused thereby) the projection g has
reached the end of the plane j and as the link piece fis movable the projection
drops over the end of the straight plane j into the beginning of the spiral groove h
(Figure 2) and upon again opening the breech the whole operation is repeated
In order to throw the repeating mechanism out of gear the projection c is
turned by hand through an angle of 90° whereby the said projection comes to rest
upon the opening of the breech with its smaller side over the tooth d of the slide g
whereby the latter cannot be carried with it in its movement.
l
When the breech is closed a cap fitted on the feather of the breech bolt b covers
the opening for the insertion of cartridges thus preventing the access of dust to the
breech and the mechanism of the lock.
At the end of the chamber is fixed a safety catch consisting of an angular
lever K whose arm m is closed up when the striker is cocked and drops into a
corresponding hollow n and thus prevents the escape of the striker even if the
trigger be released.
What I claim is :-
First The means for operating and securing the breech bolt substantially as
described.
Second-The means for advancing the cartridges consisting of a screw which is
rotated by the breech bolt as it retires substantially as described.
Third The construction of breech loading repeating fire arins substantially as
described.
In witness whereof I the said Gustavus Baron de Overbeck have hereunto set
my hand and seal this sixteenth day of January in the year of our Lord One
thousand eight hundred and eighty four.
OVERREOK