A snap mechanism is disclosed for use in double-barrelled shot-guns
having two hammers and a single trigger. The mechanism utilizes
a sled-like selector means mounted on and displaceable transversely
on an oscillating connector that connects the trigger with a rocker.
The selector interacts with the snap rods of the hammers for selectively
releasing or detaching first one hammer and then the other, or viceversa,
depending on which of the two barrels is to be used in the firing
of the cartridge.
What is claimed is:
1. Snap mechanism for double-barrelled shot-guns comprising:
(a) two hammers pivoting on an underguard and coordinated with
the barrels' firing mechanisms;
(b) two snap rods for blocking said hammers in the armed position;
(c) a trigger for separately controlling the displacements of said
rods, so as to release in succession said two hammers;
(d) an inertial mass or rocker for effecting the actions of said
trigger on said rods;
(e) an oscillating connector mounted on said trigger on the tail
end thereof and connecting said trigger with said rocker; said snap
mechanism being characterized by:
(f) a selector arrangement mounted on said connector and displaceable
transversely thereon into two different positions, so as to interact
with and detach in succession by means of said rods first one hammer
and then the other hammer, following the movements of the trigger.
2. The snap mechanism according to claim 1 wherein said selector
arrangement consists of a sled-like selector means mounted on an
intermediate portion of said connector, and wherein said sled-like
selector means is blocked in each one of said two different positions
by a spring-loaded piston.
3. The snap mechanism according to claim 2 wherein said sled-like
selector means has a central snap tooth for alternately controlling
said rods, said central tooth having on opposite sides thereof two
catches positioned rearwardly with respect to the tooth, said catches
interacting with said rods and controlling the one of said two rods
that is not released by said tooth.
FIELD OF THE INVENTION
The present invention relates to shot-guns and sporting guns in
general and, more particularly, to a snap mechanism for double-barrelled
guns of this type with an arrangement for the selective release
of the hammers.
BACKGROUND OF THE INVENTION
In the field of double-barrelled shot-guns and sporting guns, whether
the barrels are superimposed on one another or positioned side by
side, there are already known various snap mechanisms with two hammers
pivoting on an underguard and coordinated, respectively, with the
firing pins corresponding to the two barrels. These known mechanisms
have also a pair of snap rods for blocking the hammers in the cocked
position, and a trigger that controls separately, by means of an
inertial mass or rocker, the displacement firstly of one snap rod
and then of the other nap rod, in order to unhook or release the
two hammers in succession. In such known mechanisms, the trigger
is connected to the inertial mass or rocker by means of an oscillating
connector mounted on the tail of the trigger and displaceable height-wise
together with such tail.
Similar snap mechanisms, also called monotrigger batteries, may
include also selector means that permit the selective detachment
or release firstly of the hammer related to one barrel and then
of the hammer related to the other barrel, or viceversa, depending
on the requirements of the user.
U.S. Pat. No. 4091556 discloses a mechanism of the type described
hereabove, in which, according to an embodiment thereof, the oscillating
connector for the connection of the trigger to the inertial mass
or rocker is provided with steps interacting with the rods of the
hammers and is displaceable in the transverse direction, so as to
release firstly one hammer and then the other in a reversible sequence.
In practice, the sequence of release of the hammers may be modified
by moving the connector to the right or to the left through a sled-like
control selector mounted on the inertial mass or rocker and positionable
Such a construction is relatively complex. It calls for oscillations
by the connector in two orthogonal directions, that is to say, in
the longitudinal direction as well as in the transverse direction
and implies some work by the inertial mass or rocker in order to
mount the sled-like selector.
BRIEF DESCRIPTION OF THE INVENTION
It is, therefore, an object of the present invention to provide
a snap mechanism of the monotrigger type defined above, in which
the selector is mounted directly on the connector that connects
the trigger to the inertial mass or rocker and is displaceable transversely
on the connector.
By such arrangement, one achieves the advantage of leaving unchanged
the shape, the mounting and the function of the inertial mass or
rocker. Another advantage is the simplification of the construction
of the overall device and, particularly, of the connector and of
the selector. Still another advantage is the possibility of utilizing
a connector susceptible of oscillations only in the direction of
the axis of the battery together with the inertial mass or rocker.
To this end, the snap mechanism of the present invention conforms
to the recitation given in claim 1.
An illustration of a practical embodiment of the invention will
be presented hereinafter with reference to the accompanying representative,
but not limitative drawings, in which
FIG. 1 is a perspective view of the mechanism of the invention;
FIG. 2 is a plan view of the mechanism of the invention, after
removal of the springs of the hammers and with the selector means
in a first position of use;
FIG. 3 is a view analogous to that of FIG. 2 but with the selector
means in a second position of use;
FIG. 4 is a side and partial view of the mechanism of the invention;
FIG. 5 is a sectional view of a detail of the selector means, taken
along arrows V--V of FIG. 4.
DETAILED DESCRIPTION OF THE INVENTION
The mechanism of the present invention comprises two hammers 1
and 2 pivoted on the underguard 3 by means of a pivot 4. The hammers
have the function of striking the firing pins corresponding to a
pair of barrels which may be either superimposed to each other or
positioned side by side (not shown)
Hammer 1 is urged, in a manner known per se, by a snap spring 5
and is hooked in the armed or cocked position by a snap rod 6 which
is mounted oscillatingly on a pivot 7 and is terminating at its
rear end in a beak 6'. Similarly, hammer 2 is urged by a snap spring
8 and is hooked in the armed or cocked position by a snap rod 9
which is mounted, also oscillatingly, on pivot 7 and is terminating
at its rear end in a beak 9'.
The displacement of the hammers 1 and 2 into the armed or cocked
position is determined by moving levers 10 controlled by the opening
of the barrels, while the release or detachment of the hammers for
striking is controlled by a single trigger 11 in accordance with
a reversible successive action more fully described hereinafter.
On the tail of the trigger 11 there is pivoting at 12' an oscillating
connector 12 positioned on the rear of the two rods 6 and 9 and
displaceable height-wise together with the trigger. Connector 12
furthermore, connects the trigger to an inertial mass or rocker
13 through a small rod 12" which is integral with the connector
12 and is engaging a corresponding seat 13' provided in the rocker
13. Rocker 13 is pivotably attached underneath, at 14 to the underguard
3 and is urged by a spring that normally keeps it displaced toward
the snap rods 6 and 9 together with the connector 12.
The mechanisms, further, comprises a selector arrangement 16 for
the selective release or detachment of hammer 1 or hammer 2 for
the firing of a cartridge in a first barrel and then in the other,
According to the invention, the selector arrangement 16 consists
of a sled-like selector 17 mounted and guided in a corresponding
seat 18 transversely provided on the intermediate portion of the
oscillating connector 12 the selector 17 being displaceable to
two extreme positions defined by a spring-loaded piston 17'.
In its intermediate portion, the selector 17 is provided with a
central snap tooth 19 which serves to cooperate, alternately, with
beak 6' of rod 6 or with beak 9' of rod 9 depending on the position
of the selector itself On opposite sides of the snap tooth 19 the
selector has two snap catches 20-21 positioned somewhat backward
with respect to the central snap tooth 19 and, therefore, farther
spaced or distanced from the beaks 6' and 9' of the rods 6 and 9
The catch 20 cooperates with beak 6' of rod 6 when the central
snap tooth 19 engages th beak 9' of rod 9. Conversely, the catch
21 cooperates with the beak 9' of rod 9 when the central snap tooth
19 engages the beak 6' of rod 6.
At least beneath the snap tooth 19 there is provided a bevel 22
against which acts the rear terminal of one rod 6 or the other rod
9 so as to move temporarily rearwardly the oscillating connector
12 and, together with it, the rocker, during the phase of arming
or cocking the hammers, that is to say, when the rods 6 and 9 move
into position of interaction with the selector 17.
In practice, when the sled-like selector 17 is fully displaced
to the left, as shown in FIG. 2 its central snap tooth 19 is positioned
beneath the rear beak 6' of rod 6 of hammer 1 and cooperates with
this beak without interfering with the beak of the rod 9 of the
other hammer 2. In this condition, when the hammer are armed or
cocked, by acting a first time on the trigger 11 the oscillating
connector 12 is displaced upwardly and to this displacement corresponds
the movement of the rod 6 by the action thereon of the snap tooth
19 so as to release or detach the hammer 1 and obtain the firing
of the cartridge existing in the barrel corresponding to this hammer.
When the trigger is released, the oscillating connector 12 moves
downwardly and, urged by the spring-loaded rocker 13 moves forwardly
toward the rods until it positions the catch 21 of the selector
underneath the beak 9' of the other rod 9.
In this manner, by pressing once again the trigger 11 one causes
by means of the catch 21 the displacement of the rod 9 for the release
or detachment of the other hammer 2.
When, then, the selector 17 is moved to the right, as shown in
FIG. 3 the opposite takes place. The snap tooth 19 is positioned
beneath the beak 9' of rod 9 of hammer 2 and it cooperates with
this beak, so as to detach firstly the hammer 2 as a result of a
first manouver or action of the trigger 11.
Subsequently, after releasing the trigger 11 the catch 20 of the
selector 17 engages the beak 6' of rod 6 so that when the trigger
is pressed again, the detachment or unhooking of hammer 1 is obtained.
It is, therefore, obvious and evident how the simple positioning
of the sled-like selector 17 in one or the other of the two predetermined
positions allows the control of the release of the hammers, following
two opposite sequences dependent on whether the right barrel cartridge
or the left barrel cartridge is to be fired.