Improved Apparatus for Preventing Simultaneous Discharge of Both Barrels in a Sporting Gun.
Year: 1893

page_text: Date of Application, 1st Feb., 1893
Complete Specification Left, 1st Nov., 1893-Accepted, 9th Dec., 1893
PROVISIONAL SPECIFICATION.
Improved Apparatus for Preventing Simultaneous Discharge of
Both Barrels in a Sporting Gun.
I, PAUL THEOPHILE BERTHAUD, Director of the Société Stéphanoise d'armes,
of St. Etienne in the Department of the Loire and Republic of France, do hereby
declare the nature of this invention to be as follows :-
37
The object of this invention is a little apparatus termed "Isolater which
suitably placed in the mechanism of a sporting gun prevents the simultaneous
discharge of both barrels and is applicable to guns without visible hammers, with
automatic ejector, interrupter, and automatic safety mechanism.
This isolater is composed of a single small metal piece placed at the end of a
rod forming part of the automatic safety mechanism, the isolater being loose on
this rod and having two wings or arms which when not operating are at a certain
distance above the tumblers or sears; this distance is not arbitrary, it must be less
than the rise of the end of the sear to cause the escape of its opposite end from
the stop notch of the hammer; it is taken equal to the half of the entire rise.
The apparatus being thus arranged, if both the triggers are simultaneously
pulled, the two sears will be uplifted, but at half the riso necessary for the fall of
the hammer, they will come into contact with the isolater, which although loose on
its axle cannot oscillate, being equipoised by the pressure exercised on overy side
by the sears; henceforth these latter are arrested in their ascensional movement
and neither of the hammers can come down.
If on the contrary only the right hand trigger is pressed, the corresponding sear
will be raised half its journey, it will certainly meet the isolater, but this latter
which will not be supported on the opposite side by the other scar will oscillate on
its axle and permit the complete ascension of the right hand sear and the discharge
will take place. Instead of actuating the isolater by the sears I may equally well
actuate it by the triggers. When the two hammers are simultaneously cocked by
the break down of the barrel, it is necessary that, at this instant, tlie two sears
have a perfectly clear course and for this purpose I make a depression in the onds
of the scars so that on moving the lever to lower the barrel the slide bar is driven
forward pushing with it the rod upon which the isolater is pivotted, the result
being that the isolater which moves towards this rod will place itself above these
depressions and thenceforth the sears may rise together to the full extent required
for cocking the hammers.
Dated this 1st day of February 1893.
COMPLETE SPECIFICATION.
Improved Apparatus for Preventing Simultaneous Discharge of
Both Barrels in a Sporting Gun.
I, PAUL THEOPHILE BERTHAUD, Director of the Société Stéphanoise d'armes,
of St. Etienne in the Department of the Loire and Republic of France, 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 object of this invention is a little apparatus termed "Isolator" which,

page_text: suitably placed in the mechanism of a sporting gun prevents the simultaneous
discharge of both barrels, and is applicable to guns without visible hammera, with
automatic ejector, interrupter, and automatic safety mechanism.
The isolator is composed of a single small metal piece represented by way of
example upon the accompanying sheet of drawings to which the following
description refers and upon which :-
Figure 1, is a cross section following the line 1-2 3-4 of Figure 2.
Figure 2, is an inside view of the left hand mechanism of a sporting gun the
hammer being cocked and the barrels dropped.
Figure 3, shows the isolator at the time of the discharge of the right barrel and
the braking of the left mechanism.
Figures 4 and 5 shew the two triggers simultaneously raised.
The mechanism shown is that of a gun without visible hammers and with
automatic ejector, interrupter and automatic safety mechanism in which the
isolator 1 is placed at the end of a rod D forming part of the automatic safety
mechanism the isolator I being loose on this rod D and having two wings or arins
which when not operating are at a certain distance above the tumblers or
sears AA; this distance is not arbitrary, it must be less than the rise of the end
of the sears to cause the escape of its opposite end from the stop notch of the
hammer; it is taken equal to the half of the entire rise.
The apparatus being thus arranged, if both the triggers are simultaneously
pulled, the two sears will be uplifted, but at half the rise necessary for the fall of
the hammer, they will come into contact with the isolator, which although loose on
its axle cannot oscillate, being equipoised by the pressure exercised on every side
by the sears; henceforth these latter are arrested in their ascensional movement
and neither of the liammers can come down as shown in Figures 4 and 5.
If on the contrary (Figure 8) only the right hand trigger is pressed, the corre-.
sponding sear will be raised half its journey, it will certainly meet the isolator,
but this latter which will not be supported on the opposite side by the other sear
will oscillate on its axle and permit the complete ascension of the right hand sear.
and the discharge will take place. Instead of actunting the isolator by the
sears A AI may equally well actuate it by the triggers B.
When the two bammers are simultaneously cocked by the break down of the
barrel; it is necessary that, at this instaut, the two sears AA have a perfectly
clear course which would not be the case with the isolator in the position Figure 2.
To avoid this inconvenience I make a depression in the end of the sears A A
(Figures 1 and 2) so that on moving the lever to lower the barrel the slide bar is
driven forward pushing with it the rod upon which the isolator is pivoted, the
result being that the isolator which moves towards this rod D will place itself
above these depressions and thencoforth the sears may rise together to the full
extent required for cocking the hammers.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
1. In sporting guns the use of a rocking bar I, operated by means of the
triggers or sears, or by any other working part or parts of the lock for the
purpose of preventing the simultaneous discharge of the barrels, as described and
illustrated upon the accompanying drawings.
2. The particular arrangement shown and described upon the accompanying
drawings as and for the purposes specified.