Improvements in Lock Mechanism for Guns.
Year: 1892

page_text: Date of Application, 2nd Feb., 1892-Accepted, 11th June, 1892
COMPLETE SPECIFICATION.
Improvements in Lock Mechanism for Guns.
A communication by THOMAS JEFFERSON LOCKWOOD, of Muncie, in the State of
Indiana, United States of America, Inventor.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool and 6 Bank Street,
Manchester both in the County of Lancaster and 323 High Holborn in the
County of Middlesex, Civil Engineer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :---
This invention relates to the construction of double lock mechanism for guns,
and consists in the arrangement of the several parts so that either trigger may
operate either lock independently, or both locks successively of either barrel, and
is applicable both to the ordinary hammer gun and what is called the hammerless
gun, and will be understood from the following description:
In the drawings,
Fig. 1 is a sectional view of a part of the stock with one of the locks removed,
showing the interior mechanism of the other lock and the oscillating lever.
Fig. 2 is a top view showing both locks in place.
Fig. 3 is a detail inner side view of the sear and tumbler mechanism, the lock
spring being broken away.
Fig. 4 is a detail view, slightly enlarged, of the divided sear, unjointed.
Fig. 5 is a view similar to Fig. 1, showing a modified form of the device as
applied to a hammerless gun.
Fig. 6 is a side view of a modification of the mechanism shown in Fig. 5, wherein
the oscillating lever operates directly upon the triggers.
Fig. 7 is a rear end view of a part of Fig. 6.
Fig. 8 is a top view of another modification of the oscillating lever and its con-
nections, wherein it is possible to discharge either barrel with the same trigger,
lifting only one sear instead of both.
Fig. 9 is a view similar to Fig. 5 showing another modification of the form of the
lever as applied to a different style of hammerless gun.
Fig. 10 is a top view of the same, showing both hammers raised.
Fig. 11 is a similar view, the right hand hammer being down.
Fig. 12 is a detail perspective view of the reciprocating lever with its
pivoted arm.
Fig. 13 is a central longitudinal section of the sear and tumbler mechanism,
showing a modified form of the reciprocating lever as adapted for the hammer gun.
Fig. 14 is a top view similar to Fig. 10, showing another modification of the
device with both hammers raised.
Fig. 15 is a side elevation of Fig. 14.
Fig. 16 is a view similar to Fig. 15, showing one of the hammers down.
Fig. 17 is a detail perspective view of the rear end of the lever shown in
Figs. 14, 15 and 16.
Fig. 18 is a top view of another modification of the lever, both hammers being
raised.
Fig. 19 is a view similar to Fig. 9, showing another modification of the lever,
wherein it is divided into parts which are allowed to act independently, and then
jointly when locked together.
Fig. 20 is a top view of the same mechanism, both hammers being raised.
Fig. 21 is a similar view, one of the hammers being down.
Fig. 22 is a perspective view of the two levers detached.

page_text: Fig. 23 is a view similar to Fig. 19, showing another modification of the
levers.
Fig. 24 is a top view of the lever mechanism shown in Fig. 23, both hammer
being raised.
Fig. 25 is a similar view, one hammer being down.
The form of mechanism shown in Figs. 1 to 4 of the drawings will first be
described, which represents an ordinary double hammer gun, and then in order the
modifications of the mechanism shown in the other figures of the drawings.
In detail is the lock casing, which is connected to the stock in the usual
manner. 2 are the hammers; 3 the lever which locks the breech and the barrels.
5 is the lock spring, which is loop-shaped, its upper arm bearing upon the pivot 6
connected to the dog 7 which is pivoted at 8 to the tumbler 9. The lower end of
this spring rests upon the tongue 10 of the dog 11 of the sear 12 being its shank.
This sear is formed in two parts, as shown in Fig. 4, pivotally united at 13, by a
screw that passes through the lower end of the bridle 15. The shank 12 of the
sear has a recess 14 into which the tongue 10 enters. 15 is the bridle which
confines the tumbler, as shown in Fig. 3. 16 is a pawl rigidly mounted on the inner
end of a screw pin 17 which passes through the hammers and the tumblers, and
as the hammer is raised, the end of the pawl 16 moves in an opposite direction, and
is so located as to bear against the projection 18 on either side of the oscillating
lever 19. At the upper end of this lever is formed a stirrup 20 having a slot
above through which passes the guide pin 21 which also passes through a slot in
the lever, and is threaded to enter the block 22 upon which the oscillating lever
rests, this block being formed integral with the base of the casing 1. 23 are two
springs formed preferably of a single piece, whose outer ends fit into notches in the
projection 18 on the ends of the oscillating lever. This pin is centrally secured by
a screw pin 24 entering the block 22. The rear end of the oscillating lever 19 is
notched, forming two short upper arms 25 which are in line with corresponding
notches in the rear ends of the sears, and below the sears are lower arms 26 formed
on the lever which pass beneath the sears, and the sears rest on them, and in this
position, see Fig. 2 the oscillating lever 19 is inoperative. 27 is the right hand,
and 28 is the left hand trigger, pivoted to the block 22 each having a rear
projection which bears upon the inner end of the shank 12 of the sears. When the
hammers are down, by pulling the trigger on one side its sear is raised, its notch
passing up astride of the arm 25, of the oscillating lever, and no effect is produced
thereon. The sear, in that case, rests directly upon the lower arm 26 of the lever,
a notch being formed between the arms 25 and 26 on each side to admit the scar,
as shown in Fig. 1. When the hammer is cocked or thrown up, the tang of the
pawl 10 is thrown forward, as shown in the dotted lines in Fig. 3, engaging with
the projection 18 of the oscillating lever, and this causes a rotary movement of the
lever about the guide pin 21 swinging the inner end of the lever towards the lock
spring, and causing its upper arm 25 to rest directly upon the shank 12 of the sear
as shown in dotted lines in Fig. 2. Upon pulling the trigger, the contact of the
pawl 16 is removed from the projection 18 of the oscillating lever on one side, and
the pressure of the spring 5 throws the lever back, causing it to oscillate about its
guide pin, and the upper arm 25 is thrown away from the lock spring, and into line
with the notch in the end of the sear.
So far, the movement of the parts when the right hand trigger 27 which is
normally adapted to operate its own hammer, is pulled, has been described. When,
however, the left hand hammer is raised, the pawl 16 on that side contacts with the
corresponding projection 18 and the lever oscillates in an opposite direction,
throwing the arm 25 on that side over upon its sear, and when the trigger 28 is
pulled, the hammer is thrown forward, the dog 11 of the sear being disengaged
from the notch in the tumbler 9 the pressure of the pawl 16 is released from the
projection 18 of the lever, the spring 23 on that side returns the lever to its normal
position, the arm 25 dropping into line with the notch in the sear. When either
hammer is thrown back, the dog of the sear on that side engages with the notch

page_text: formed on the edge of the tumbler 9 in the usual manner and locks it in
position.
Heretofore the sear has been formed of a single piece, that is, solid from front to
rear. A sear of that kind would not operate with an oscillating lever when
constructed and applied in the nianner just described, because, upon raising either
hammer, the oscillating lever is so shifted as to lock both scars in position, and the
raising of the other hammer would neutralize this result, shifting the lever and
releasing the sear on the opposite side, thus discharging the barrel. Therefore the
raising of either hammer operates to shift the oscillating lever, and both sears will
lock, because the arms 25 are thrown over upon the shank of each sear, and, no
matter which of the triggers is pulled, it will operate both sears, thereby discharging
the barrel whose hammer is raised. When both hammers are raised, the oscillating
lever is brought back to the center into the position shown in Fig. 2, and the lever
is then inoperative, and each trigger, being raised, will operate its own hammer
independent of the other. It is therefore necessary in this form of lever to have a
jointed sear so that the shank 12 may have a slight movement independent of the
dog 11. This will allow the raising of the hammer without operating the inner
rear end of the sear.
The second form of mechanism will now be described, which is adapted for what
are commonly called hammerless guns, this modification being shown in Fig. 5.
Here the hammers 2 are concealed, and are cocked by the two movements. of
throwing the breech up and down. When cocked, these hammers take the position
shown in the dotted lines in Fig. 5, bearing directly against the end of the lever 19
and the springs 23 bear from behind directly against the shoulders 30 formed on
the lever in front of the guide pin 21. In other respects, the mechanism is the
same and the sears may be released separately by pulling either trigger, the same
as in the hammer gun and in the manner hereinbefore described, the main difference
being in the hammer operating directly against the front end of the lever, pressing
it backward instead of operating upon the sides and pressing it forward as in the
case of the hammer gun. Thus either trigger will operate to lock one or both locks
successively, whether the gun be of one pattern or the other, the main advantage of
having two triggers being where the barrels are of a different bore, it gives the
operator the choice of which he will fire first.
In Figs. 6 and 7 another modification of the mechanism is illustrated, whereby
the end of the lever 19 engages directly with the notches 31 formed in projections 32
on the upper part of the triggers, so that the connection between the lever and the
trigger is direct instead of through the sears. In this case, the cocking of either
hammer shifts the lever to one side as before, the projections 33 formed on the end
of the lever, see Fig. 7, entering the notches 31 on the upper end of the triggers, as
shown in Fig. 6, thus locking both triggers by the operation, and the pulling of
either trigger will discharge its barrel, and when both hammers are raised, or when
both are down, the oscillating lever is not engaged with either trigger, the parts
then being in the position shown in Fig. 7. In this, the projections 33 on the
oscillating lever are substituted for the arms 25 & 26 shown in Figs. 1 2 and 5, and
the sears 12 are shown in position directly over the triggers, and when either hammer
is raised, the oscillating lever is shifted to the opposite side, the projections 33
engaging the notches 31 in both triggers.
In the case of the hammerless gun, inasmuch as both hammers are cocked by
the same operation, the lever 19 is then inoperative, being in the position shown in
Fig. 7, and each trigger will then operate its own lock, but, as soon as one trigger
is discharged, the pressure of the spring upon the opposite side shifts the lever,
its projections 33 entering notches 31 in the upper end of the trigger, locking both
of them and then by releasing the pressure upon the trigger and again pulling it,
will discharge the remaining barrel.
In Fig. 8 is shown another modification of the lever 19 which may be used in
either class of gun. Here the shank of the lever is curved and bears normally
against the under side of the sear 12 of the right hand lock, the trigger 27 being

page_text: directly under such lever. Upon cocking the right hand hammer, the pressure of
the pawl 16 against the projection 18 oscillates the lever, throwing it still more
to the right, and still further under the sear 12. Upon cocking the other hammer,
the pressure of the pawl 16 against the projection 18 on that side operates to
bring back the lever to the position shown in Fig. 8, which is its normal position,
but, it still being over the trigger 27 the pulling of this trigger produces no effect
upon the left hand sear, consequently the barrel on that side will not be discharged.
Indeed the left hand trigger 28 will never operate the right hand barrel, but it
will operate the barrel on its own side in any position, thus giving the operator
his choice of which barrel he will fire first. Now, if the right hand trigger be
pulled when both hammers are raised, the parts being in the position shown in
Fig. 8, the right hand hammer will be thrown down and the barrel discharged,
and the pressure on the projection 18, on that side being released, the pull of
the opposite spring oscillates the lever, throwing it under the left hand sear,
and freeing it from the right hand sear, and the lever being still over the right
hand trigger 27 a pull upon either trigger will then discharge the remaining
barrel. If the shank of the lever 19 shown in Fig. 8 be curved to the left instead
of to the right, then the above operation will take place in a reverse order, that is,
the right hand trigger will only operate its barrel, while the left hand trigger will
operate both barrels successively, of course firing its own barrel first. In using
this form of the lever for the hammerless gun, the springs 23 will be set back of
the projections 18 as shown in Fig. 5. The object of this form of lever is to
prevent the operation of both sears by the pulling of a single trigger, thus avoiding
in such movement the combined pressure of both springs.
In the form of levers shown in Figs. 6 and 8, the sear is made solid instead of
being jointed. Instead of making the pawl and the tumbler in separate pieces, it
is practicable to extend the forward part of the tumbler so that its end will operate
directly against the projection 18 instead of the pawl, thus performing the office of
the latter, and this might be advantageous where the gun stock is narrow, and
there is want of room to use the tumbler and pawl shown in Fig. 3. It should be
added that, when both hammers are raised, the pressure of the pawls on the
projections 18 is equal on both sides, thus forcing the lever 19 forward against the
pressure of the springs 23 the slots in the lever and stirrup allowing this forward
movement, but, of course, in a hammerless gun, the movement is backward instead of
forward. When the hammers are thrown down, the action of the spring 23 reverses
this movement, carrying the lever bodily back to its former place. The two positions
of the guide pin 21 in Figs. 5 and 6 illustrates this movement. The slots 4 in the
stirrups are made only wide enough to allow the free entrance of the guide pin and
the lateral up and down movement of the lever without friction, so as to prevent
any twisting movement of the lever, which would be the result when one of the
sears is lifted, unless prevented by the size of the stirrup, and the main object of
the latter is to prevent this.
The modified form of the mechanism shown in Figs. 9 to 12 will now be
described. Here the lever has a central opening which fits over a block 22 and is
provided with an arm 34 pivoted at 35 to the forward end of the lever, and having
a broad bearing at its ends.
36 is a loop spring fastened by a screw 37 to the casing, its end bearing directly
against the upturned end or hook 38 of the lever 19. The inwardly turned ends of
the scars lie directly upon the triggers 27 and 28 and in a depression or notch 39
formed in the reciprocating lever see Fig. 9, and are adapted to engage with the
latter, which connects them together at the proper moment so that they act as a
unit, and either barrel may then be fired by the remaining trigger as heretofore
described.
In the case of a hammerless gun, as shown in Figs. 9, 10 and 11, when the
hammers are both raised, they contact with the broad ends of the pivoted arm 34
and hold it substantially at right angles to the lever, the parts being in the position
shown in Fig. 10. When however, one of the hammers only is raised, it engages

page_text: with the broad end of the pivoted arm 34 on that side, and the parts are then in
the position.shown in Fig. 11. In the first case, the scars are not locked, and, if
the right hand barrel be discharged, the arm 34 will swing on its pivot, and the
spring 36 will force the lever 19 forward, and the hook 38 of the lever will pass
over the inwardly turned ends of the sears, locking them between this hook and
the extension of the lever, so that, by pulling again upon the same trigger, the
remaining hammer will be thrown down and its barrel discharged, or by pulling
the left hand trigger, the same result will be accomplished. Thus, in the gun
shown in Figs. 9, 10 and 11, it makes no difference which trigger is pulled, as the
discharge of either barrel will release the pressure of its hammer against the pivoted
arm 34 and the spring will be free to thrust forward the lever until both scars are
locked by the engagement of the hook 38 of the lever, and the pulling of the same
trigger will then discharge the remaining barrel.
In Fig. 13 is shown a similar mechanism connected with a hammer gun. Here
the lock of the gun is substantially the same as shown in Fig. 1, the pawl 16 con-
tacting with the outer ends of the arm 34 which in this case is flat, instead of having
broadened ends, as shown in Fig. 12. The lever 19 in this case is not provided with
a hook 38 or notch 39, as shown in Figs. 9, 10, 11 and 12. These parts are cut
off and a projection 40 is formed directly on the rear end of the lever. The
loop spring 36 which, in Figs. 9, 10 and 11, pushes the reciprocating lever forward,
is replaced by a coiled spring 41 in Fig. 13, which is fastened at its rear end to a pin
projecting from the casing, and at its forward end directly to the rear of the lever,
the normal tension of the spring being to draw the lever backward, and when either
parrel is fired, the pawl 16 upon that side releases its hold upon the arm 34 of the
lever, the latter oscillates, the coiled spring 41 pulling the lever backward until its
projection 40 passes over and rests upon the inturned ends of both sears, locking
them together and causing them to operate as a unit, hence the pulling of the same
trigger will then discharge the remaining barrel.
In the modification shown in Figs. 14, 15, 16 and 17, the end of the reciprocating
lever 19 is made in the form shown in Fig. 17 that is, the upright 38 and the
hook 39 of the lever as shown in Fig. 9 are cut off. Shoulders 42 are formed on
the under side of the lever, and the scars are solid instead of being jointed.
In Fig. 14, this form of the lever is shown in position with both hammers raised,
the inturned ends of the sears being directly over the triggers and the rear extension
of the lever, neither sear being locked, insomuch as the shoulders 42 of the levers
are directly over the notches 43 in the triggers, but not in engagement therewith,
and when one barrel, for instance, the right, is discharged, as shown in Fig. 16, the
spring 36 operates to thrust the lever 19 forward, thus bringing the shoulders 42 of
the lever over past the notches 43 of the triggers and- in contact therewith, the
extension of the lever yet remaining beneath the sears, whereby the pulling of
either trigger operates to discharge the remaining barrel.
In the modification shown in Fig. 18, the rear extension of the lever differs from
those shown in Figs. 12 and 17, one of the sears only resting upon it at a time.
In this instance, it is the left hand sear, and when both hammers are raised, should
the operator wish to discharge both barrels with the same trigger, the left hand
barrel must always be fired first. The lever is cut out forming a notch at 44 and,
when the left hand barrel has been fired, the spring 36 thrusts the lever forward
and the end of the left hand sear stands over this notch and out of engagement
with such lever. By the same movement, the projection 45 formed on the opposite
side of the lever is brought beneath the end of the right hand scar, and, that sear
being then in engagement with the lever, the pulling of the left hand trigger will
then discharge that barrel, or it may be discharged by its own trigger. It will be
understood that, in this modification, the left hand barrel must always be fired first
in order to discharge both barrels with the same trigger.
It will be seen, by the use of the form of lever shown in Figs. 15, 16, 17 and 18,
that there will be no need of the jointed sear, as the ends of the scars 12 are never
locked, and therefore will allow the cocking of one hammer while the other is raised.

page_text: In the modification shown in Figs. 19 to 22, there are two levers 46 formed with
extensions or arms 47 at their forward ends, which engage with the hammers of the
gun when cocked. The under side of the levers have dovetailed tongues which
work in corresponding grooves formed in the top of the sears. These levers are
independent, each being controlled by a separate spring attached to the casing, and
bearing against the rear end of the lever, which is enlarged as shown at 48 and the
inner face of one of these is provided with two grooves 49 one vertical and the
other horizontal. The opposite lever has a square pin 50. When both hammers
are cocked and the levers are in the position shown in Fig. 20, by pulling upon
either trigger, the pin 50 will have a free movement in the vertical slot 49 of the
opposite lever, but when the pressure on the trigger is released, and the sear with
its lever drops back into place, the spring 36 at the end of that lever forces the
lever forward on the sear, carrying the pin 50 into the horizontal groove 49
locking both levers, and through them the sears, and in this case either barrel may
be discharged by either trigger.
In the modification shown in Figs. 23, 24 and 25, the divided levers 46 have
beveled arms 47 at one end which engage with the hammers when raised, and at
the opposite end are enlargements 48 the inner face of one having vertical and
horizontal grooves 49, the opposite one having a central pin 50 which works in
these grooves.
When in the position shown in Fig. 24, the pin is in the center of
the groove, or at a point where the two grooves cross. The levers rest, at a little
to one side of their center, in a bracket which projects on either side of a block
and on the under side of the lever is a hook 51. The sears, which are single, are
provided at their outer ends with a hook 52 which engages with the hook 51 of the
lever when the hammer is cocked. Both hammers being raised, as shown in
Fig. 24, and the levers being locked with their sears, when the right hand trigger
is pulled, the pressure of the spring 36 on the end will force the right hand lever
forward, releasing it from engagement with the sear, and, at the same time, the pin
will enter the horizontal groove on the lever, thereby locking both levers together,
so that, when the same trigger is pulled, both levers will be operated, thereby
firing the other barrel and operating only upon one sear. The advantage of this
construction over the. others is that either barrel may be fired by its own trigger,
and the remaining barrel by either trigger, and at the same time, both sears are
never operated on together, for the reason that, as soon as one barrel is fired,
the sear on that side is released from engagement with its lever, and it will not
operate until that hammer is cocked again.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is:
1. In a gun, a double lock mechanism, a lever pivoted between the locks, and
means whereby the cocking of either hammer shifts the lever into connection with
both sears, substantially as described.
2. In a gun, a double lock mechanism, a pivoted lever, normally spring balanced,
between the locks, and operative means between the hammers and the lever
whereby the cocking of either hammer shifts the lever into connection with both
sears, substantially as described.
3. In a gun, a double lock mechanism, a pivoted lever, normally spring balanced,
between the locks, the rear end of such lever having two horizontally slotted
prongs thereon, shoulders on either side of such lever in front of its pivot and lugs
on the hammer tumblers which impinge on the respective shoulders on the lever
during the cocking movement, and flat sears which register with the slots on the
prongs of such lever when either hammer is cocked, substantially as shown and
described.
4. In a gun, a double lock mechanism, a pivoted lever normally spring balanced
between the locks, its slotted end engaging with the sears on each side, lugs
connected to the opposite end of such lever for contacting with the hammers when

page_text: the latter are raised, whereby the pressure of either trigger on its sear will operate
its own hammer separately and both hammers successively, substantially as shown
and described.
5. In a gun, a double lock mechanism, an oscillating lever normally spring
balanced pivoted between the locks, one end contacting with the hammers when
the latter are raised, the opposite end of such lever having slotted prongs thereon,
sears connected to the locks which register with the slots on the prongs of such
lever when either hammer is cocked, substantially as shown and described.
6. In a gun, a double lock mechanism, a pivoted lever normally spring balanced
between the locks, one end of such lever adapted to contact with the hammer
tumblers during the cocking movement, the other end of such lever provided
with two slotted prongs, and scars which register with the slots of the prongs
of such lever when either hammer is cocked, substantially as shown and described.
7. In a gun, a double lock mechanism, an oscillating pivoted lever normally
spring balanced between such locks, one end of such lever having two slotted
prongs thereon, shoulders on either side of such lever at the other end, lugs on the
hammer tumblers which impinge on the respective shoulders of the lever during
the cocking movement, and sears which register with the slots of the prongs of
such lever when either hammer is cocked, substantially as shown and described.
8. In a gun, a double lock mechanism, an oscillating pivoted lever normally
spring balanced between the locks, shoulders on either side of such lever at one end
contacting with the hammers when the latter are raised, and sears located above
the opposite end of such lever, whereby both sears may be tripped successively
by a single trigger, substantially as shown and described.
9. In a gun, a double lock mechanism, a lever pivoted to such locks, and means
whereby the cocking of either hammer shifts the lever into connection with both
triggers, substantially as shown and described.
10. In a gun, a double lock mechanism, a pivoted lever normally spring balanced
between the locks, and operative means between the hammers and the lever,
whereby the cocking of either hammer shifts the lever into connection with both
triggers, substantially as described.
11. In a gun, a double lock mechanism, a pivoted lever normally spring balanced
between the locks, the rear end of such lever having projections or prongs thereon
which engage with projections upon the triggers when either hammer is cocked,
whereby the pulling of either trigger will successively discharge both hammers,
substantially as described.
12. In a gun, a double lock mechanism, a pivoted lever normally spring balanced
between the locks, sears formed of two parts hinged together, and means whereby
the cocking of either hammer shifts the lever into connection with both the sears,
substantially as shown and described.
13. In a gun, a double lock mechanism, a pivoted lever normally spring balanced
between the locks, sears formed of two parts hinged together, whereby the dog is
allowed a movement independent of its shank, and means whereby the cocking of
either hammer shifts the lever into connection with both the sears, substantially as
described.
14. In a gun lock mechanism, a sear formed of two parts hinged together at the
pivotal point, whereby the dog is allowed a slight movement independent of its
shank, substantially as described.
15. In a gun, a double lock mechanism, a spring controlled lever adapted to
reciprocate therein, an oscillating arm pivoted at one end of such lever, the
hammers when raised contacting with the ends of such arms, a projection on the
opposite end of such lever adapted to operate upon and lock the scars together
when one barrel is fired, substantially as shown and described.
16. In a gun, a double lock mechanism, a spring controlled lever reciprocating
therein, one end extending beneath the sears and over a single trigger and notched
to form suitable projections for engaging with the sears, such lever actuated by
an oscillating arm pivoted to its opposite end, the hammers when raised contacting

page_text: with the ends of such arm, whereby both hammers may be released by a single
trigger, substantially as shown and described.
17. In a gun, a double lock mechanism, a pair of independent levers having
projections on their forward ends for contacting with the hammers when raised,
the rear ends of such levers adapted to engage with each other by means of a
pin formed upon one and vertical and horizontal grooves upon the other, such
levers provided with dovetailed projections working in corresponding shaped
grooves in the shanks of the sears, such sears formed of two parts pivotally
connected together, whereby the dog is allowed a slight movement independent
of its shank, springs secured to the casing and adapted to bear against the rear
ends of such levers for restoring them to their normal position when the hammers
are down, such levers locked by the raising of a single hammer, whereby either
trigger will fire either barrel, substantially as shown and described.
18. In a gun, a double lock mechanism, a pair of independent levers having
projections on their forward ends for contacting with the hammers when raised,
the rear ends of such levers adapted to engage with each other by means of a
pin formed upon one and vertical and horizontal grooves upon the other, such
levers provided with dovetailed projections working in corresponding shaped
grooves in the sears, springs secured to the casing and adapted to bear against
the rear ends of such lever for restoring them to their normal position when
the hammers are down, such levers locked by the raising of a single hammer,
whereby either trigger will fire either barrel, substantially as shown and described.
19. In a gun, a double lock mechanism, independent spring controlled levers
supported upon a block connected to the casing between the locks, the forward
ends of the levers having projections for engaging with the hammers when the
latter are raised, the rear ends of such lever provided with projections, one of
these projections having a pin and the other vertical and horizontal grooves for
receiving such pin, such projections on the lever resting upon the triggers, hooks
formed upon the levers behind the supporting block, sears pivoted below such
levers and having hooks on their rear ends for engaging the hooks formed upon
the levers, the pulling of either trigger operating to lock the levers together,
whereby the remaining barrel may be fired by either trigger, substantially as
shown and described.
Dated this 1st day of February 1892.
WM. P. THOMPSON & Co.,
Agents for the Applicant.