Improvements in Single Trigger Double Barrelled Drop Down Guns.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Single Trigger Double Barrelled Drop Down Guns.
I, JOHN ROBERTSON, trading as Boss & Co., of 73, St. James Street, Pall Mall,
in the County of Middlesex, Gunmaker, do hereby declare the nature of this
invention to be as follows:
-
The present invention relates to single trigger double barrelled drop down
guns, in which an interceptor is employed and acts in conjunction with a movable
part, which is shifted by the first pull of the trigger, so that such movable part
cannot effect its complete movement which is requisite to cause it to engage the
second sear until the trigger has been first pulled to effect the firing of one
barrel, and after the involuntary pull has occurred (such an arrangement being
described in the Specification of my prior Patent No. 22894, dated 26th November
1894), and it consists in means whereby the barrel to be first discharged (that is
to say, the right or left) may be selected at will.
For this purpose I employ a part pivotted to the trigger and which can be
actuated from the outside of the gun, so that an arm or projection thereon can
be brought at will either under the sear of the right or the left hand barrel,
whereby the first pull of the trigger will discharge the barrel selected, and then
the involuntary pull due to the recoil of such discharge having terminated, a
movable part which serves to discharge the second barrel will turn into the
position under the sear of the other barrel, so that the latter will be discharged
on the third pull of the trigger. The part pivotted to the trigger so that it can
be brought under either the right or left hand sear at will may consist of two
pieces each acting in conjunction with one of the sears, and either of which may
be moved so that it is shifted from beneath its sear, while the other one remains
under the sear which it actuates, whereby only that sear under which the movable
part on the trigger remains will be actuated by the first pull of the trigger,
while the second will be actuated as before on the third pull of the trigger, by
the shifting part which has been allowed to move to the requisite position for
effecting this, after the involuntary pull due to the recoil of the first discharge
has terminated.
The movable part (or parts) carried by the trigger may be actuated from the
outside of the gun by any suitable means, such as a slide conveniently connected
to such shifting part or parts or controlling the position of same, and fitted with
a spring so as to retain it in the position to which it has been shifted, in order
to prevent accidental displacement.
After the discharge of one barrel, the latter may be recharged in the usual
manner, and unless the slide for actuating the shifting part carried by the trigge
is reversed, the same barrel will be again discharged when the trigger is again
pulled.
Dated this 12th day of ML1808

page_text: Improvements in Single Trigger Double Barrelled Drop Down Guns.
I, JOHN ROBERTSON, trading as Boss & Co., of 73, St. James Street, Pall Mall,
in the County of Middlesex, Gunmaker, 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 present invention relates to single trigger double barrelled drop down
guns, in which an interceptor is employed and acts in conjunction with a movable
part, which is shifted by the first pull of the trigger, so that such movable part
cannot effect its complete movement which is requisite to cause it to engage the
second sear until the trigger has been first pulled to effect the firing of one
barrel, and after the involuntary pull has occurred (such an arrangement being
described in the Specification of my prior Patent No. 22894, dated 26th November
1894), and it consists in means whereby the barrel to be first discharged (that is
to say, the right or left) may be selected at will.
A suitable manner of carrying out my invention is illustrated in the accompany-
ing drawings, in which
Fig. 1 is a longitudinal sectional elevation of the lock of a gun constructed
according to my invention, and
"
Fig. 2 a sectional plan view of same both showing the parts in the position
for firing the right hand barrel first.
Fig. 3a sectional plan view showing the parts in the position for firing the
left hand barrel first.
Figs. 4 to 13 inclusive are detail views showing the different positions of the
parts during the complete action of firing both barrels of the gun, each position
being shown in elevation and in plan respectively.
Fig. 14 is a sectional plan view taken from the under side showing the part
I employ for shifting the position of the movable piece so as to effect the firing
of either the right hand or the left hand barrel first, as desired.
Figs. 15 and 16 are further detail side views of the circularly reciprocating
tumbler.
As above stated the object of the present invention is to enable the user of a
single trigger double barrelled gun to select which of the two barrels he will
discharge first, one of same (usually the right hand) being generally made with
a smooth bore while the other is made with a choke bore. It is of great advantage
to the users of such guns to be able to discharge first whichever barrel will suit
the circumstances best, and with the object of enabling this to be done I employ
a movable part A pivotted to the trigger B at b, such part having arms or projec-
tions a a¹ thereon, and being so situated that one or the other of such arms or
projections can be brought to lie under one of the sears C or C₁, and consequently
in a position to raise such sear when the trigger carrying part A is first pulled.
Any suitable means actuated from the outside of the gun may be employed
for moving the movable part A on its pivot b so as to bring the arm or projec-
tion a or a¹ under the sear of the barrel it is desired to discharge first. In Fig. 14
of the drawings I have shown an arm D passing through the side plate of the
action and engaging a recess or notch d in one side of the movable part A, such
arm D being formed in one with a slide d¹ working on the outside of the gun,
and by the position of which the user of the gun can readily see which barrel
will be discharged on the first pull of the trigger. In the position shown in
full lines in Fig. 14 the left hand barrel would be discharged first, while in
the position shown in broken lines in such fig. the right hand barrel would
be the first to be discharged. A spring E the free end of which engages a pin e

page_text: on arm D is preferably employed to hold the latter in the position to which it
has been moved.
In connection with the arrangement above described I employ a circularly
reciprocating tumbler which as hereinafter described acts in conjunction with
the trigger B to discharge the second barrel after either the right or left hand
barrel has been discharged as above described on the first pull of the trigger by
the arm or projection a or a¹ on part A engaging the sear C or C, and after the
consequent involuntary pull has occurred.
Such circularly reciprocating tumbler F is actuated by a suitable spring, and
after the discharge of the gun may be returned to its normal position against
the action of such spring by means of a sliding rod f connected at one end with
the locking bolt G of the gun, and bearing at its other end against the side of
the tumbler. Further the tumbler is prevented from rising on its pivot until
the second barrel of the gun is to be discharged by means of a projection f¹ on
such pivot being situated over a part f" of the tumbler, such part f being
removed from under the projection f when the second barrel is to be discharged.
The construction and operation of the tumbler F are substantially the same as
fully described in the Specification of my prior Patent No. 22894 dated 26th
November 1894, hereinbefore referred to.
Referring now to the detail views shown in Figs. 4 to 13 inclusive, in which
for the sake of illustration I have represented the right hand barrel as being
the first to be discharged, it will be seen in Fig. 5 that part A is in the position
for acting on the sear C of the right hand barrel, and that the tumbler Fis
retained in position against the action of its spring by a projection g at its
lower end being in contact with the side of the trigger blade B. On the trigger
being pulled to discharge the first barrel such trigger blade will release the
projection g and so allow the tumbler F to turn on its pivot until a projection h
at its top comes in contact with the trigger blade, as shown in Fig. 6. On the
involuntary relaxation of the pull on the trigger which follows the discharge
of the first barrel, projection h will be released from the trigger blade, and
tumbler F will turn until it is in the position shown in Fig. 8, the projection i
at its lower end coming into contact with the side of the trigger blade, and on
the second or involuntary pull taking place the parts will assume the positions
shown in Fig. 10, projection k at the upper end of the tumbler preventing it from
turning farther by coming against the upper edge of the trigger blade. After
the release of the trigger following the involuntary pull projection at the lower
end of the tumbler will come in contact with the trigger blade, as shown in
Fig. 12, in which position the tumbler F is free to rise on its pivot as its part f
has been removed from under the projection fl on such pivot, so that when the
trigger B is next pulled the rear end of its blade engaging under the upper part
of the tumbler will raise the latter, and so lift the sear C₁ of the left hand barrel
which is situated immediately over the tumbler.
It will be understood that the action of the tumbler will be exactly the same
whether the right or left hand barrel is discharged first, as the sears of both
barrels are situated over the tumbler, so that after one barrel has been discharged
by the part A acting on its sear the involuntary pull will take place and on the
circularly reciprocating motion of the tumbler F being completed and the trigger
pulled a third time, the second barrel will be discharged by the raising of the
tumbler which will effect the release of its sear.
It will therefore be seen that by turning the part A under either sear by means
of the arm D attached to the slide on the outside of the gun, the user of the
gun can discharge first whichever barrel will suit the circumstances best.
After the discharge of one barrel the gun may be opened and the barrel
recharged in the usual manner, and unless the slide & for actuating the shifting
part A. carried by the trigger B has been reversed, the same barrel will be again
discharged when the trigger is next pulled.
Should however such slide d¹ have been moved so that the undischarged barrel

page_text: will next be fired first, the movement of the locking bolt of the gun returning
the tumbler F to its normal position by means of the rod f, would (through
the inclined sides of projections 9 and i of the tumbler acting on the side of the
trigger blade) tend to raise the trigger, which would cause the premature dis-
charge of the second barrel, owing to the arm or projection a or a¹ of part A
having been shifted into the position for actuating the sear of same. To avoid
this I make the projections g and i separate from the tumbler, and form them
on a spring collar g¹ surrounding the lower part of the tumbler, as shown in
Figs. 15 and 16, the latter fig. showing clearly the action of this arrangement
when the tumbler is being returned to its normal position by the rod f. When
the tumbler is being actuated by the rod f and the projections g and i are brought
against the side of the trigger blade B, instead of tending to lift the latter they
will themselves yield or be depressed against the action of their spring g¹, and
so pass under such trigger blade as shown in Fig. 16.
The part pivotted to the trigger so that it can be brought under either the right
or left hand sear at will may consist of two pieces each acting in conjunction
with one of the sears, and either of which may be moved so that it is shifted
from beneath its sear, while the other one remains under the sear which it
actuates, whereby only that sear under which the movable part on the trigger
remains will be actuated by the first pull of the trigger, while the second will be
actuated as before on the third pull of the trigger, by the shifting part which
has been allowed to move to the requisite position for effecting this, after the
involuntary pull due to the recoil of the first discharge has terminated.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
-
1. In single trigger double barrelled drop down guns, the combination of a
part pivotted to the trigger blade and having arms or projections either of which
can be brought under one of the sears so as to discharge first whichever barrel
may be desired, with means which prevent the discharge of the second barrel
until after the involuntary pull on the trigger has occurred, substantially as
specified.
2. The combination of a single trigger, two sears, and a movable part pivotted
to the trigger and which can be shifted so that it can act on either of such sears
as desired, means for actuating such movable part from the outside of the gun,
and means which prevent the second of such sears being acted upon, until after
the involuntary pull on the trigger has occurred, substantially as specified.
3. Mounting the projections g and i which act in conjunction with the trigger
blade, upon the tumbler F, so that such projections can yield and pass under the
trigger blade, instead of causing the latter to be raised when the tumbler is
being returned to its original position, substantially as and for the purpose
specified and as illustrated in Figs. 15 and 16 of the drawings.
Dated this 8th day of February 1899.
ALLISON BROS.,
Agents for the Applicant.