An Improved Gun Lock for Double Barrelled Guns.
Year: 1893

page_text: Date of Application, 3rd Jan., 1893
Complete Specification Left, 3rd Oct., 1893-Accepted, 3rd Jan., 1894
PROVISIONAL SPECIFICATION.
An Improved Gun Lock for Double Barrelled Guns.
I, LEONARDO GUIDOTTI of 36 Via Fillungo Lucca in the Kingdom of Italy,
Professor in the Technical School do hereby declare the nature of this invention
to be as follows:-
The invention consists in an improved gun lock for double barrelled guns and
the principal object of the invention is to modify the construction of gun lock in
which a breech closing bolt after preliminary disengagement by rotation is drawn
back in an axial line parallel with the axes of the barrels for opening the breech,
so that the same bolt may operate with regard to the chambers of both barrels
simultaneously.
The breech block carries two rotary cylinders the axes of which are alligned
with the axes of the respective barrels the chambers of which they are intended
respectively to close. The bolt which revolves in the base of the breech block
and is provided with a laterally extending lever arm for revolving it carries a
toothed pinion engaging in teeth on each of the aforesaid cylinders so that the
revolving of the bolt revolves the cylinders and brings lugs thereon out of recesses
which locked the cylinders from backward movement.
The rotation of the bolt thus unlocks the cylinders and the drawing back of the
bolt draws back both cylinders and affords access to both cartridge chambers. An
ejector if such be provided moves with the bolt when withdrawn and draws the
empty cartridge shells. The drawing back of the bolt cocks the two central firing
pins in the usual way. The trigger plates may have notches in them into which a
sliding bolt may be pushed so as to lock them and prevent the discharge of either
barrel until the said sliding bolt is withdrawn by hand. The lugs and their
recesses for locking the breech block cylinders are preferably helicoidal on their
faces so that the cylinders are securely pressed tightly against the ends of the
cartridge chambers.
The tight closing of these breech block cylinders may also be attained by
making them with non rotary faces extending rearward within tubular sockets in
the cylinders, prevented from revolving by the shape of the firing pins which
project through them and prevented from falling out by lugs engaging in annular
sockets in the interior of the cylinders. The meeting planes of these face plates
and the ends of the cylinders are slightly helicoidal so that the rotation of the
cylinders for locking slightly forces forward the face plates and causes them the
close the breeches tightly.
Dated this 3rd day of January 1893
R. HADDAN,
Agent for Applicant.
COMPLETE SPECIFICATION.
An Improved Gun Lock for Double Barrelled Guns.
I LEONARDO GUIDOTTI of 36 Via Fillungo, Lucca in the Kingdom of Italy,
Professor in the Technical School 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:-
The invention consists in an improved gun lock for double barrelled guns and
נם

page_text: the principal object of the invention is to modify the construction of gun lock
in which a breech closing bolt after preliminary disengagement by rotation is
drawn back in an axial line parallel with the axes of the barrels for opening
the breech, so that the same bolt may operate with regard to the chambers of
both barrels simultaneously.
The breech block carries two rotary cylinders the axes of which are alligned
with the axes of the respective barrels the chambers of which they are intended
respectively to close. The bolt which revolves in the base of the breech block and
is provided with a laterally extending lever arm for revolving it, carries a toothed
pinion engaging in teeth on each of the aforesaid cylinders so that the revolving of
the bolt revolves the cylinders and brings lugs thereon out of recesses which locked,
the cylinders from backward movement.
An
The rotation of the bolt thus unlocks the cylinders and the drawing back of the
bolt draws back both cylinders and affords access to both cartridge chambers.
ejector, if such be provided moves with the bolt when withdrawn and draws the
empty cartridge shells. The drawing back of the bolt cocks the two central firing
pins in the usual way. The trigger plates may have notches in them into which a
sliding bolt may be pushed so as to lock them and prevent the discharge of either
barrel until the said sliding bolt is withdrawn by hand. The lugs and their recesses
for locking the breech block cylinders are preferably helicoidal on their faces so
that the cylinders are securely pressed tightly against the ends of the cartridge
chambers.
The tight closing of these breech block cylinders may also be attained by making
them with non-rotary faces extending rearward within tubular sockets in the
cylinders, prevented from revolving by the shape of the firing pins which project
through them, and prevented from falling out by lugs engaging in annular sockets
in the interior of the cylinders. The meeting planes of these face plates and the
ends of the cylinders are slightly helicoidal so that the rotation of the cylinders for
locking slightly forces forward the face plates and causes them to close the breeches
tightly.
The annexed drawing illustrates the manner in which the invention may be
performed.
Fig. 1 is a section in a plane in which lies the axis of one of the barrels on the
line 1.1 Fig. 2.
Fig. 2 is a cross section on line 2. 2. Fig. 1.
Fig. 3 is a cross section on line 3. 3. Fig. 1.
Fig. 4 is a longitudinal central section on the line 4. 4. Fig. 2.
Fig. 5 is a side elevation of one of the breech closing cylinders.
Fig. 6 a side elevation of the gas tight facing piece thereto.
Fig. 7 is a rear elevation of the said facing piece.
Fig. 8 is a plan view of the said cylinder.
Fig. 9 is a horizontal section through the same, and
Fig. 10 illustrates in perspective the bolt with its toothed wheel and the ejector.
A is the breech closing block provided, with a bearing a for the bolt B and a
space a' for the toothed wheel C which is fixed on the inner end of the bolt B.
B' is the lever of the bolt and B2 the locking nose which enters the slot D' in bed
frame or lock plate D as shown in Figs. 3 and 4. E, E are the two cylinders
which close the breech ends of the cartridge chambers F F of the barrels G,
and E are the teeth or recesses equivalent to teeth in the cylinders E E' to engage
with the aforesaid toothed wheel C. At each end of the teeth or recesses E2 is a
solid flange E³, E, whereby the drawing back and forth of the breech block A
It will be obvious
bolt B and toothed wheel draws back the two cylinders E El.
that the turning of the bolt B causes the simultaneous turning of the two
cylinders E E'. E' are lugs on the cylinders E E' which engage in corresponding
recesses (not shown) in the breech chambers and lock the cylinders E E when
closed. The edges E of these lugs are made helicoidal so that the turning of the
lugs into their recesses causes the cylinders E E' to be firmly pressed against the

page_text: orifices of the cartridge chambers F. The firing pins H are inserted through
the slots E' into the cylinders E E' respectively and their lugs H' project through
the slots E which are cut as shown in Figs. 5 and 9 so that their faces in direction
of the muzzle of the gun are helicoidal as at E³ whereby the revolving of the
cylinders E E' causes the drawing back of the firing pins H whose lugs H become
caught behind the sears J. The breech block A is guided by a hollow cylindrical
bar of tempered steel K placed below and between the barrels and supported to
slide on the framing of the gun lock D. This bar K is screwed into the fore end of
the breech block and its movement is limited by the screw K' projecting into a
slot K therein. The ejector for the two barrels L (Fig. 10) has a collar L' sliding
on the bar K but met eventually by a raised or thickened portion K³ thereon so as
to be moved rearward to draw the cartridge shells. The screw K' also serves to
maintain the trigger plate M in its place. The barrels G are provided each with a
screw threaded breech G¹ made with slots for passage of the ejector and recesses
for the lugs in the cylinders E E. The bolt B is secured in placed by a long
axial pin N with a milled head N', this pin passing longitudinally through the
bolt B and screwing into the end of the bar K.. These parts may be easily taken
to pieces or replaced without screw drivers or other tools.
In the front of each trigger O is a notch O¹ (Fig. 1) and on the trigger plate M
a sliding plate O2 is provided with an exterior button O³ for moving it back and
forth. The rearward end of the plate O' is adapted to enter the notches O' and so
lock the triggers O and prevent discharge of the gun until it is again drawn forward
free of the said slots.
The drawings illustrate the additional facing piece P for the cylinders E. E' by
which also secure gas tight closing may be attained when the cylinders E, E' are
closed. This face plate P is provided with a cylindrical rearward extension P1 to
fit within the correspondingly hollowed anterior end of the cylinder E or E.
P is the passage for the firing pin, and P3 a lug fitting in the recess P' in the
cylinder E or E, after entering same through longitudinal slot P³, to hold the face
plate to the cylinder without preventing the independent revolution of the cylinder.
The face plate P is prevented from revolving by the feather P on the firing pin
fitting in the slot P7 while the firing pin is itself prevented from revolving by the
lug H lying in the slot H2 in the bed plate of the breech block. It will be
understood therefore that the face plate P does not turn when the cylinder E or E¹
is revolved; but only follows the back and forth movement of the cylinder. As
however the rear face of the plate P is helicoidal as at P while the end of the
cylinder E or E' is in this case also helicoidal, the effect of the turning of the
cylinder E or E' is to force forward or withdraw the face plate P according to
the direction of the rotary movement. The slot P* is of course of sufficient width
or obliquity to permit this slight end wise movement of the face plate P.
Having now particularly described and ascertained the nature of this said
invention and in what manuer the same is to be performed, I declare that what I
claim is ;-
The improved breech closing devices for double barrelled guns, comprising
closing or locking devices arranged substantially parallel, provided with locking
lugs, and adapted to be moved by a toothed pinion through the aid of a bolt lever
manipulated by hand, substantially as illustrated and described.
Dated this 3rd day of October 1893.
R. HADDAN,
c/o Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, W.C., Agent for Applicant.