Year: 1887

page_text: Date of Application, 9th May, 1887
Complete Left, 4th Oct., 1887
Complete Accepted, 13th Dec:, 1887
We, SILVESTER KRNKA, Manufacturer, and KARL KRNKA, Lieutenant in the
Austrian Army, both of Prague, Bohemia in the Empire of Austria, do hereby declare
the nature of this invention to be as follows:-
Our invention relates to that class of fire-arms known as "bolt-guns," and more
especially to those which have a magazine arranged to feed the cartridges sidewise
up through an opening in the bottom of the receiver, from whence they are pushed
forward by the bolt into the chamber of the barrel.
Our said invention consists
First, in a special construction of the device by which it is made possible to unlock
the bolt and draw the same back by one straight pull on the thumb-lever, and likewise
to thrust the said bolt forward and lock the same by a straight push on the said
thumb-lever.
Second, in an improved construction of the lock, enclosed in the hollow breech-
bolt.
Third, in a novel magazine, suspended from the underside of the receiver and con-
taining two juxtaposited piles of cartridges.
Fourth in improved means for securing the magazine to the arm; and
Fifth in means for converting the arm in a hand breech loader, while the magazine
is fixed to the same.
According to the first part of the invention, the rear end of the breech bolt,
projecting beyond the rear side of the receiver, carries a socket, endwise movable on
the bolt and provided with an inward projecting pin, that penetrates into a helical
slot, formed in the side of the hollow bolt.
To the said socket is rigidly secured the thumb-lever or handle, which preferably
first extends straight rearward from the socket, is then bent at a right angle to the
right, and provided at its end with a bell-shaped hollow knob, that extends downward
and rearward.
In order to prevent the said socket from turning with the breech-bolt, it has a
tongue formed on its underside and this tongue is guided in a corresponding groove
of the tail of the receiver. Thus this thumb-lever socket is adapted to displace itself

page_text: endwise on the rear end of the bolt, and to cause this bolt in the same time to turn a certain
angle, whereby the bolt is unlocked or locked, that is to say the rib of the bolt is disengaged
from or engaged into the recess of the receiver. The backward movement of the
socket on the bolt being limited by the flange of the screw-plug by which the rear
end of the bolt is closed, the said socket will as soon as it has reached the flange of
the screw-plug, carry along the bolt and thereby open the breech. For preventing the
thumb-lever socket, while the breech is being closed, from displacing itself on the
bolt before this latter has been wholly pushed forward, a spring plate or bar is placed
in a longitudinal groove of the bolt, the rear end of this spring bar springing out
from the groove just in front of the withdrawn socket as soon as the bolt begins to
move backward and being forced down into the groove again when the breech bolt
is wholly pushed forward.
The aforesaid screw-plug, by which the rear end of the breech-bolt is closed, has a
central bore, through which projects the rear-end of the firing pin. The coiled spring
by which this pin is actuated, bears by one end against the screw-plug and by the
other end against a collar of the firing pin, this collar having a certain thickness so
as to guide the pin in the same time in the hollow space of the bolt.
In the side of the tubular screw plug is formed a helical slot, corresponding to the
similar slot formed in the bolt, and the pin of the thumb-lever socket penetrates
through both registering slots into a recess of the firing pin in consequence whereof
the lock is cocked when the said socket is moved back on the bolt. On the following
backward movement of the bolt, the aforesaid spring bar keeps the socket in its position
and thereby prevents the lock from uncocking, and when hereafter the bolt is thrust
forward into the receiver, the catch or sear articulated to the trigger, springs into
a longitudinal slot of the breech and places itself in front of the collar of the firing
pin, whereby the lock is further maintained in the cocked condition.
In the outward projecting rear end of the firing pin there is an angular groove,
composed of a longitudinal and a transverse leg or branch, and into said groove penetrates
a small pin or nib, formed in the rear opening of the screw-plug of the bolt. When
the lock is cocked, the said nib is placed in the vertex of the angular groove. By
turning the screw-plug a small angle, the nib is caused to enter the transverse leg of
the groove, whereby firing is provented.
The magazine is of the type generally known as the "Lee magazine." The width
of the same is somewhat smaller than twice the diameter of a cartridge, in consequence
whereof each cartridge of the two juxtaposited piles which are filled into the magazine,
tangentially penetrates between two cartridges of the other pile or column. A coiled
spring common to both columns of cartridges constantly lifts them so as to force the
uppermost cartridge between the inward bent springy flaps formed at the upper edges
of the laterel sides of the magazine.
The trigger guard is screwed to the stock by its rear end only and is made springy,
and on the loose front end of the same there is formed a hook, for hooking on
the same one or the other of two corresponding hooks, secured at different heights to
the rear side of the magazine. The higher of these two two hooks is used, when the
arm is to serve as a hand breech loader or single loader; in this case two spring
flaps, which bear against the lateral sides of the raised magazine, approach each other
as soon as the magazine is lowered, and thus sufficiently close the opening in the
bottom of the receiver as to allow of cartridges being placed into the receiver from
above.
When no magazine is connected to the receiver, a slide is pushed over the lower
surface of the same, this slide being moved on the shaft or fore-part of the stock,
when a magazine is to be inserted.
ليم
1
1003
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicants.

page_text: We SILVESTER KRNKA, Manufacturer, and KARL KRNKA Lieutenant, in the
Austrian Army, both of Prague, Bohemia, in the Empire of Germany, 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 :-
Our invention relates to that class of fire arms known as "bolt guns" and more
especially to those which have a magazine arranged to feed the cartridges sidewise
up through an opening in the bottom of the receiver from whence they are pushed
forward by the bolt into the chamber of the barrel.
Our said invention consists partly in the construction of the breech, partly in the
arrangement of the percussion lock and partly in the magazine and means for
connecting the same with the fire arm.
The improvements in the breech, consists in a movable socket guided in a straight
line at the rear end of the breech bolt and provided with a pin projecting inwardly
and engaging with a helical slot in the said breech bolt. The said pin extends
through the slot in the breech bolt to the front of an offset in the firing pin so that
the said pin becomes cocked during the disengagement of a rib on the breech bolt by
the initial displacement of the said socket.
The inner width of the "Lee magazine" suspended below the receiver is somewhat
smaller than double the diameter of the cartridge flange, so that with the two juxta-
posed piles of cartridges which the magazine contains the flange of each cartridge
penetrates tangentially between two cartridges of the other pile. Both piles of
cartridges are pressed upward by a common helical spring and during the repeated
opening and closing of the breech, a cartridge of one pile and then a cartridge of the
other pile enters alternately the path of the breech bolt.
For securing the magazine to the fire arm hooks are arranged at the rear wall of
the magazine these hooks are engaged by the front end of the spring trigger-guard
which is secured by a screw at the rear end. To close the slot in the breech casing
when the magazine is removed a slide is provided which can be slid upon the fore
part of the stock.
In the accompanying drawings
Figure 1 is a vertical longitudinal section of the fire arm when the breech is
closed.
Figure 2 is a plan of one part thereof.
Figure 3 is a vertical longitudinal section of the same when the breech is open.
Figure 4 is a vertical longitudinal section when the breech is closed showing
the firing pin in its cocked position.
Figure 5 is a horizontal section showing the breech bolt partly drawn back, and
the firing pin in its cocked position.
Figure 6 is a side view of the breech bolt, and
Figure 7 a rear end view of the same.

page_text: hollow collar d of the firing pin D keeps the striking spring d' cocked at the moment
when the breech handle socket a begins to move forward again upon the polygonal
screw-shaped end 6 of the breech bolt, in order to turn in the breech rib 62.
The firing pin D is provided at its rear end with an angular groove d³ into which
extends a pin or projection c¹ arranged upon the breech cylinder screw C. This
arrangement has for its object to prevent the accidental firing of the gun, the breech
cylinder screw C being turned into such a position that the pin c¹ enters the transverse
part of the groove d³.
To render this turning motion of the screw C possible despite the pin a' penetrating
into it, the groove c is provided with a transverse branch groove c². The lug c³ by
which the screw C is operated is bent beyond the middle of the screw so that it forms
at the same time a guard for the protection of the person using the gun against the
gases, which when the percussion cap of the cartridge case is injured escape along
the firing pin. Accidental turning of the firing pin D is prevented by the plane end
surface of the pin a¹ bearing continually against the plane surface of the recess d.
As clearly shown in Figures 1, 2 and 3, the breech handle A instead of projecting
laterally as usual is bent downward which greatly facilitates the operation of the same
during quick firing when aiming or pointing continuously. To diminish the weight
of the handle the latter is hollowed out to the shape of a bell.
It will be readily understood that the pin a¹ in conjunction with the slots 61 and c
also forms a system of straight-pull breech bolt, so that when these parts exist the use
of the breech-cylinder end 6 as a screw and that of the breech handle socket a as a
nut is superfluous, of course in that case the pin a¹ would have to be made sufficiently
strong.
If in a firing pin lock of the described arrangement the breech rib b² is not com-
pletely turned in, firing cannot take place because after the disengagement of the
catch or sear g the firing pin D pressed to the front by the spring d¹, must also
carry with it the pin a', and therefore can, if at all, move only slowly to the front.
The magazine H is a small sheet metal casing, the walls of which have several
openings, and the transverse dimension of which is somewhat less than double the
diameter of the cartridge, so that two piles of cartridges find room in this magazine
only in such a manner that each cartridge penetrates tangentially between two
cartridges of the other pile.
Below both piles of cartridges is placed a common helical spring / the pressure of
which forces the piles of cartridges against the upper opening, bounded by spring
lugs h₁ h₁, on the magazine. As often as the advanced breech-bolt carries away the
uppermost cartridge extending into its path, and pushes it into the charging chamber,
a cartridge of the other pile takes its place. For stiffening the walls of the magazine,
upon the bridge between the openings is formed a rib h³ that is convex to the
outside, moreover in each side wall of the magazine is pressed a rib ³ that is convex
to the inside, in such a manner that these two ribs ³ constitute the sole bearing
points for the cartridges, thus reducing the friction to a minimum, the more because
rolling friction is substituted for sliding friction.
At the rear end of the uppermost convolution of the spring h, or at the rear end of
the spoon which can be attached to the said spring his arranged, a projection he
extending upwards as seen in Figures 27 and 28. If after firing the last cartridge
from the magazine the breech bolt is pulled back again, the projection he enters the
path of the said breech bolt and prevents the forward motion of the same, so that the
inability to close the breech will indicate that the magazine is empty.
The free front end of the spring trigger-guard I serves to support the magazine by
means of the projection h, arranged on the rear wall of the same and provided with
two rests. The rear end of the trigger-guard also carries the spring g' which presses
upon the trigger G, and which was produced in the old fire arm in one piece with the
trigger. If the magazine is to be lowered, in order to use the fire arm as a single
loader, or to eject an empty magazine, the front part of the trigger guard is simply
pressed back more or less forcibly with the hand.
By this means the spring flaps J J are closed which during the employment of the

page_text: fire arm as a single loader serve to support the cartridge (see Figure 22). These flaps
form one piece with the spring ; that supports the small block K, the latter consti-
tutes the support upon which the cartridges slide into the charging chamber and is
pressed down by the breech-bolt B as soon as the breech is closed.
In order to enable the breech casing E being closed below when the magazine is
taken out, a slide M is provided which is slid upon the fore part N of the stock when
it is not in use, as clearly shown in Figures 19 to 23, the slide M consists of a sheet-
metal plate with the longitudinal edges m bent inwardly. These bent edges engage
with the projecting ribs e', on the lower edge of the breech casing E, and with bars n
Figure 21, let into the stock on both sides.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed we declare that what
we claim is ;-
a,
First. In a straight-pull cylinder breech a pin a' arranged upon the breech handle
socket which pin extends through helical slots b' and c of the breech bolt Band of the
breech bolt screw C into a recess d of the firing pin D, so that during the motion, of
the breech handle socket a upon the breech bolt B which causes the disengagement
of the breech rib the firing pin D is drawn back and is thus cocked.
Second. A straight-pull cylinder breech, in which from a socket that loosely
encloses the rear end of the breech bolt a pin extends into a helical slot of the rear
end of the breech bolt.
Third. A Lee magazine the transverse dimension of which is somewhat smaller
than double the diameter of the cartridges, so that cach cartridge of the parallel piles
of cartridges put in the magazine extends tangentially between two cartridges of the
other pile, and, under the action of a helical spring arranged below the piles of
cartridges, a cartridge of one pile and of the other pile passes alternately to the upper
opening of the magazine.
Fourth. A spring trigger guard I, to the loose front end of which is hooked the
projection * arranged on the rear wall of the magazine H.
Dated this 3rd day of October 1887.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicants.