Improved Trigger Mechanism for Double Barrelled Guns.
Year: 1898

page_text: Date of Application, 23rd Feb., 1898
02nd N...
4000
2nd Fab
1000
PROVISIONAL SPECIFICATION.
Improved Trigger Mechanism for Double Barrelled Guns.
1, EDWIN JOHN BLAND, of 17, Brook Street, London, in the County of Middle-
sex, Gun Maker, do hereby declare the nature of this invention to be as
follows:-
My invention has reference to improved single trigger mechanism for double
barrelled guns or rifles and consists in improvements on the invention set forth
in the Specification of Letters Patent granted to me numbered 5110 and dated
February 25th 1897, whereby the action is rendered more efficient and the
accidental discharge of the second barrel through the action of firing the first
is impossible.
1 gain these results by providing at the rear end of the trigger plate a sliding
piece (hereinafter called the involuntary-pull intercepting block "), having
bevelled or sloping projections with which engage bevelled surfaces on a piece
(hereinafter called the "switching arm") mounted on a vertical pivot on the
trigger.
With my present invention the trigger pull does not swing or move from side
to side, its only movement being a simple up and down one. The trigger is
connected to a piece mounted on a horizontal pivot in the head of the trigger
box. The above mentioned switching arm which is mounted on a vertical pivot
on the trigger and has a side to side movement, has a bevelled projection on
one side at its rear end said bevelled projection engaging the foremost bevelled
projection on the sliding piece at the rear end of the trigger plate. The end
of this switching arm or pivoted piece is also bevelled or sloping but in an
opposite direction to that of the bevelled projection on its side, said bevelled
end engaging a sloping or bevelled surface on the other projection or block on
the sliding piece on the rear end of the trigger plate, this latter projection being
cut away to about its middle on the side nearest the " switching arm" to formi
a bevelled surface and at the same time a stop for the switching arm,"
hereinafter referred to. On the right hand side of the trigger plate I provide, as
in my previous invention, a spring normally out of compression but put into
compression on firing the right hand barrel, to throw over the pivoted piece or
switching arm on the trigger towards the left, a spring being also provided
to the right
on the side of the trigger for returning the said "switching arm
hand position after firing the left hand barrel on opening the gun. The usual
trigger spring is of course also provided.
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The action of my invention is as follows:-
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The pivoted piece or "switching arm" on the trigger, having the side to side
movement as above described, is normally in the right hand position, and on
pulling the trigger said "switching arm moves upward, its rear end engaging
the right hand sear and thus discharging the right hand barrel. By this action
of raising the switching arm" the bevelled projection on the side of said
'switching arm engaging or sliding on the foremost bevelled projection on the
39

page_text: sliding piece or "involuntary-pull intercepting block" at the rear end of the
trigger plate draws said sliding piece forward and the spring on the right hand
side of the trigger plate (which as before mentioned is normally out of compression
but is put into compression by the firing of the right hand barrel) being put into
compression, throws over the said pivoted piece on the trigger towards the left but
not sufficiently far to place it in position for engaging the left hand sear, it being
prevented from moving beyond the middle position by the before mentioned stop
on the rear bevelled projection or block on the said sliding piece or intercepting
block the sloping or bevelled end of the "switching arm on the trigger being
thus brought into position to engage the bevelled surface on said rear projection
on the sliding piece or involuntary-pull intercepting block"; when the pres-
sure of the finger is now removed from the trigger it returns to its normal
position or drops in the ordinary way and the involuntary pull then taking place
again raises the "switching arni," the bevelled or sloping end of said arm moving
on the bevelled surface on the rear projection on the "intercepting block" allows
the switching arm to move further over to the left (under the influence of
the spring on the right hand side of the trigger plate) into position for engaging
the left hand sears, so that when now the trigger is again pulled the rear end of
said ¨ switching arm or pivoted piece on the trigger will engage the left hand
sears and fire the left hand barrel; when the trigger is again released said
"switching arm or pivoted piece is, by means of the spring on the side of the
trigger thrown back again to the right hand or normal position, on opening the
gun, ready to engage the right hand sears when the trigger is pulled.
"
"
Dated this 23rd day of February 1898
JOHN P. O'DONNELL, Fel. Chart. Inst. P.A.,
Agent for the said Applicant,
70 & 71, Palace Chambers, Westminster, S.W.
1, EDWIN JOHN BLAND, of 41-43, Whittall Street, Birmingham, in the County
of Warwick, (formerly of 17, Brook Street, London, in the County of Middlesex),
Gun Maker, 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:-
My invention has reference to improved single trigger mechanism for double
barrelled guns or rifles and consists in improvements on the invention set forth
in the Specification of Letters Patent granted to me numbered 5110 and dated
February 25th 1897, whereby the action is rendered more efficient and the
accidental discharge of the second barrel through the action of firing the first
is impossible.
1 gain these results by providing at the rear end of the trigger plate a sliding
piece (hereinafter called the involuntary-pull intercepting block"), having
bevelled or sloping projections with which engage bevelled surfaces on a piece
(hereinafter called the switching arm") mounted on a vertical pivot on the
trigger.
With my present invention the trigger pull does not swing or move from side
to side, its only movement being a simple up and down one. The trigger is
connected to a piece mounted on a horizontal pivot in the head of the trigger
box. The above mentioned switching arm which is mounted on a vertical pivot ou

page_text: the trigger and has a side to side movement, has a bevelled projection engaging the
foremost bevelled projection on the sliding piece at the rear end of the trigger plate
The end of this "switching arm" or pivoted piece is also bevelled or sloping but in an
opposite direction to that of the bevelled projection on its side, said bevelled
end engaging a sloping or bevelled surface on the other projection or block 'on
the sliding piece on the rear end of the trigger plate, this latter projection being
cut away to about its middle on the side nearest the " switching arm to form
a bevelled surface and at the same time a stop for the "switching arm," us
hereinafter referred to. On the right hand side of the trigger plate I provide, as
in my previous invention, a spring normally out of compression but put into
compression on firing the right hand barrel, to throw over the pivoted piece or
"switching arm on the trigger towards the left, a spring being also provided
on the side of the trigger for returning the said "switching arm to the right
hand position after firing the left hand barrel on opening the gun. The usual
trigger spring is of course also provided.
"
""
In order that my invention may be better understood and more readily carried
into effect I will now describe it with reference to the accompanying drawings
in which
Figure 1 is a part side view of a double barrelled gun showing my present
improvements, one of the lock plates and the left hand sears and hammer being
removed in order to more clearly show the trigger mechanism, the hammer being
in the cocked position.
Figure 2 is a part plan of the same showing in addition the left hand sears
and hammer, the hammers being in the cocked position.
"3
Figure 3 is a part plan of the same with the parts in position after firing the
right hand barrel the right hand hammer being down and the "switching arm'
thrown over into position to engage the left hand sears.
Figure 4 is a right hand side view of the trigger plate showing the trigger
box, trigger, and parts comprising my present invention, and Figure 5 is a plan
of the same.
C
The same letters refer to the same parts in the several figures of the drawings.
a, a (Figures 1, 2, 3,) are the barrels of the gun, 6, 61 are the cocking rods,
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the hammers, and d, d, d,, the right and left hand sears respectively,
the sears and being what are known as intercepting sears and provided as
an additional safeguard against the accidental discharge of the respective barrels
of the gun; e is the trigger plate on which are mounted the trigger box f and
the parts comprising my present invention, g is the piece mounted on the hori-
zontal pivot g in the head of the trigger box f, the trigger g2 being connected
to or forming part of this piece g; h is the sliding piece or "involuntary pull
intercepting block" mounted on the rear end of the trigger plate e and jis the
switching arm mounted on the vertical pivot on the trigger g² (Figures 2, 3,).
k, kare the bevelled or sloping projections on the "involuntary-pull intercepting
block" with which engage the bevelled or sloping surfaces or projections 1, 1,
respectively on the "switching arm j, is the bevelled or sloping end of the
"switching arm said end being bevelled or sloping in an opposite direction
to the bevelled surface or projection on its side. The bevelled surface or pro-
jection on the sliding piece or "involuntary-pull intercepting block" also
acts as a stop for the "switching arm" as before mentioned, m is the spring
on the right hand side of the trigger plate e said spring being normally out of
compression but put into compression on firing the right hand barrel for the
purpose of throwing over the pivoted piece or switching arm towards the
left hand (or it might be to the right) position, as herein described, and nis
the spring on the side of the trigger 2 for returning the "switching arm" j to
the right hand position on opening the gun after firing the left hand barrel.
o (Figures 1 & 4) is a stud or projection at the rear end of the trigger plate over
which the projection o' rides in the backward or forward movement of the sliding
piece or " involuntary-pull intercepting block" h, the object of this stud being
29

page_text: וי
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to prevent the said sliding piece or "involuntary-pull intercepting block."
Jaring back before the involuntary-pull takes place on discharging the first
barrel of the gun. 7, p is the usual safety mechanism, the end 2 of the
arni engaging the trigger and preventing its upward movement when the
said safety mechanism is in the back or "safe" position.
The action of my invention is as follows:
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The pivoted piece or "switching arm" on the trigger having the side
to side movement as above described, is normally (usually) in the right hand
position (see Figure 2) and on pulling the trigger g² said "switching arm" j
moves upward, its rear end engaging the right hand sear d and thus discharging
the right hand barrel a of the gun. By this action of raising the "switching
the bevelled projection (see more clearly Figures 3 & 4) on the side of
said switching arm jengaging or sliding on the foremost bevelled projec-
tion on the sliding piece or "involuntary-pull intercepting block" at the rear
end of the trigger plate e draws said sliding piece h forward and the spring m
on the. right hand side of the trigger plate e (which as before mentioned is nor-
mally out of compression but is put into compression by the firing of the right
hand barrel) being put into compression, throws over the said pivoted piece or
switching arm on the trigger towards the left but not sufficiently far to
place it in position for engaging the left hand sears it being prevented from
moving beyond the middle position by the before mentioned stop on the rear
bevelled projection or block on the said sliding piece or intercepting block h the
sloping or bevelled end of the switching arm jon the trigger being thus
brought into position to engage the bevelled surface on said rear projection
on the sliding piece or involuntary-pull intercepting block" h; when the
pressure of the finger is now removed from the trigger it returns to its normal
position, or drops in the ordinary way, and the involuntary-pull then taking
place again raises the switching arm j the bevelled or sloping
end of said arm moving on the bevelled surface k¹ on the rear
projection on the "intercepting block" allows the "switching arm"
j to
move further over to the left (under the influence of the spring m on the right
hand side of the trigger plate e) into position for engaging the left hand sears d³ ³
so that when now the trigger is again pulled the rear end of said "switching
jor pivoted piece on the trigger g² will engage the left hand sears d
and fire the left hand barrel; when the trigger g2 is again released said "switch-
ing arm
or pivoted piece j is, by means of the spring n on the side of the
trigger g, thrown back again to the right hand or normal position, on opening
the gun, ready to engage the right hand sears dd when the trigger is pulled.
It is obvious that modifications may be made in the mechanism as above
described without departing from the essential feature of my invention which is
the provision of a sliding piece as h herein before called the "involuntary-pull
intercepting block."
arm
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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 15:-
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on
1. In single trigger mechanism for double barrelled guns the combination of
a pivoted piece or switching arm mounted on the trigger blade or trigger
and having a projection at its rear end and bevelled surfaces 1, a sliding piece h
mounted on the trigger plate said sliding piece ("involuntary-pull-intercepting-
block") having bevelled projections k, with which the bevelled surfaces
the pivoted piece or "switching arm jengage, a spring m normally out of com-
pression but put into compression by the action of pulling the trigger to release
the first hammer as when firing the first barrel of the gun the rear end of said
spring m bearing against the pivoted piece or "switching arm
i, a stud or
projection o on the trigger plate, and a spring such as n for returning the parts
"
"

page_text: to the normal position on opening the gun, all arranged and operating substan-
tially as and for the purposes set forth.
2. In single trigger mechanism for double barrelled guns the combination of a
spring such as m normally out of compression but put into compression by the
action of releasing the first hammer on pulling the trigger as when firing the
first barrel, and a sliding piece or involuntary-pull-intercepting-block" such
"
ash, substantially as and for the purposes set forth.
3. The means for preventing the completion of the movement of the pivoted
piece or switching arm which alternately engages the sears for firing one or
other of the barrels on pulling the trigger until after the involuntary pull has
taken place, substantially as described.
Dated this 23rd day of November 1808
JOHN P. O'DONNELL, Fel. Chart. Inst. P.A.,
Agent for the Applicant.
70 & 71, Palace Chambers, Westminster, S.W.,