Improvements in or connected with the Lock Mechanism of Fire-arms.
Year: 1893

page_text: Date of Application, 11th May, 1893
Complete Specification Left, 10th Feb., 1894-Accepted, 24th Mar., 1894
PROVISIONAL SPECIFICATION.
Improvements in or connected with the Lock Mechanism of
Fire-arms.
1, WILLIAM MANSFIELD, trading as Joseph Brazier and Sons, of Ashes Works,
Wolverhampton in the County of Stafford, Gun Lock and Action Manufacturer,
do hereby declare the nature of this invention to be as follows:-
gear
In the lock mechanism of hammerless fire-arms it is customary to use a secondary
or intercepting sear which catches the tumbler or striker and prevents the charge
being fired, in case the nose of the main sear is shaken or jarred out of with
the bent of the tumbler such as, for instance, by the vibration caused by the
discharge of one of the barrels of a double-barreled gun. When it has happened
that the nose of the main sear has jarred out of gear with the bent of the tumbler,
and the tumbler has consequently been caught and retained by the secondary sear,
it is necessary, before the barrel in connection with which the tumbler is used can
be fired, to re-cock the lock (which involves opening and closing the gun), as the
secondary sear cannot be moved by the trigger out of gear with the tumbler. A
considerable time is therefore lost in getting the gun ready for firing, and in
consequence it frequently happens that the second barrel of a double-barrelled gun
cannot be discharged as quickly as is desirable after the first barrel has been
discharged. It is, therefore, of considerable importance that the main sear shall
be prevented from being shaken or jarred out of gear with the bent of the
tumbler.
Now, the main object of this invention is, while retaining the secondary sear or
interceptor, in the case of hammerless fire-arms, and thereby securing the
advantages resulting from its usual employment, to modify and improve the con-
struction of the sears in a manner which securely prevents the main sear from
moving until the hinder end of the secondary sear has been raised by the trigger.
The invention comprises, however, also, a simple form of catch, for use chiefly with
hammer locks, for the purpose of preventing the single sear, used with such locks,
from being raised until such catch has been first raised by the trigger; and such
catch may be used with hammerless locks also, in lieu of the secondary sear.
In applying this invention to locks having secondary sears or interceptors, the
main and secondary sears of each lock are formed in such manner that when the
main sear is in engagement with the bent of the tumbler, and the secondary sear
consequently in position to catch the tumbler if it becomes disengaged from the
main sear, a part of the main sear is immediately below or against a part of the
secondary sear or interceptor which is of such shape in relation to the said part of
the main sear, and in such position in relation to the pivot centre of the secondary
sear, that the upward pressure thereagainst, caused by any force tending to raise
the hinder end of the main sear, passes through or approximately through such
pivot centre, and thus there is no tendency of the secondary sear to yield under
such pressure, and the main sear is consequently securely prevented from rising.
When the secondary sear is raised by the trigger, the part thereof which prevents
the main sear from rising is drawn clear of the main sear which may then be raised
by the trigger.
In the construction of lock mechanism in which the secondary sear is adapted to
catch a shoulder on the lower end of the tumbler in case the tumbler becomes
accidentally disengaged from the main sear, a convenient form of the invention
consists in forming a sideway projecting lug on the main sear to the rear of its pivot

page_text: and vertically, or approximately vertically, below the pivot centre of the secondary
sear, and in forming a part along the bottom of the secondary sear to come over
and lock the lug and a break at the forward end of such part into which the lug
can rise when such part has been drawn clear of the lug.
In the construction of lock mechapism in which the secondary sear is adapted to
catch the upper portion of the tumbler, in case the tumbler becomes accidentally
disengaged from the main sear, a convenient form of the invention consists in
mounting the secondary sear to work alongside the lock plate, and curving its
hinder end round so as to bring the extreme end forwards into position below its
pivot centre, and in forming a lug on the main sear which projects both downwards
and sideways, and from the lower end of which a nib projects backwards. The
hinder end of the secondary sear is stopped against the lug and itself locks over the
nib which projects from such lug, and thus securely prevents the main sear from
rising until the hinder end of the secondary sear has been drawn back by the
trigger. The secondary sear may be formed with an arm projecting downwards
from its pivot, in lieu of curving the hinder end as described, but the latter
formation allows the hinder end of the sear to pass around the rear portion of the
lock mechanism.
It will be seen that, should the means adopted, according to this invention, for
utilising the secondary sear to prevent the main sear from rising accidentally, fail
from the portions which are interlocked giving way (which is highly improbable),
there still remains the security given by the ordinary use of the secondary sear;
and the chance of both these elements of security failing in the same fire-arm, and
at the same time, is remote in the extreme.
This invention, as it relates specially to hammer locks, consists in applying
thereto, for use with the single sear usually employed, a pivoted catch which
corresponds in essential parts with a secondary sear, adapted as above described for
the purpose of this invention, but with the portion forwards of the pivot removed,
and in adapting the main or single sear to be locked or held down thereby in the
manner in which it is described above as held down by the secondary sear; and
such a catch may be used also with a hammerless lock, if desired, in lieu of
a secondary sear adapted as described, but in such case a part of the security
afforded by the secondary sear is, of course, sacrificed. The catch is pressed down
by a spring as in the case of a secondary sear, and is stopped in its forward position
by a lug on the main sear.
Dated this 10th day of Mar 1893
STEPHEN WATKINS,
Wolverhampton, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or connected with the Lock Mechanism of
Fire-arms.
I, WILLIAM MANSFIELD, trading as Joseph Brazier and Sons, of Ashes
Works, Wolverhampton, in the County of Stafford, Gun Lock and Action
Manufacturer, 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 :-
In the lock mechanism of hammerless fire-arms it is customary to use a secondary
or intercepting sear which catches the tumbler or striker and prevents the charge
being fired, in case the nose of the main sear is shaken or jarred out of gear with
the bent of the tumbler such as, for instance, by the vibration caused by the
discharge of one of the barrels of a double-barrelled gun.
When it has happened that the nose of the main sear has jarred out of gear
with the bent of the tumbler, and the tumbler has consequently been caught and

page_text: retained by the secondary sear, it is necessary, before the barrel in connection
with which the tumbler is used can be fired to re-cock the lock (which involves
opening and closing of the gun), as the secondary sear cannot be moved by the
trigger out of gear with the tumbler. A considerable time is therefore lost in
getting the gun ready for firing, and in consequence it frequently happens that the
second barrel of a double-barrelled gun cannot be discharged as quickly as is
desirable after the first barrel has been discharged. It is, therefore, of considerable
importance that the main sear shall be prevented from being shaken or jarred out
of gear with the bent of the tumbler.
Now, the main object of this invention is, while retaining the secondary sear or
interceptor, and thereby securing the advantages resulting from its usual employ-
ment, to modify and improve the construction of the sears in a manner which
securely prevents the main sear from moving until the hinder end of the secondary
sear has been raised by the trigger.
In applying this invention the main and secondary sears of each lock are formed
in such manner that when the main sear is in engagement with the bent of the
tumbler, and the secondary sear consequently in position to catch the tumbler if it
becomes disengaged from the main sear, a part of the main sear is immediately
below or against a part of the secondary sear or interceptor which is of such shape
in relation to the said part of the main sear, and in such position in relation to the
pivot centre of the secondary sear, that the upward pressure thereagainst, caused
by any force tending to raise the hinder end of the main sear, passes through or
approximately through such pivot centre, and thus there is no tendency of the
secondary sear to yield under such pressure, and the main sear is consequently
securely prevented from rising. When the secondary sear is raised by the trigger,
the part thereof which prevents the main sear from rising is drawn clear of the
main sear which may then be raised by the trigger.
It will be seen that, should the means adopted, according to this invention, for
utilising the secondary sear to prevent the main sear from rising accidentally, fail
from the portions which are interlocked giving way (which is highly improbable)
there still remains the security given by the ordinary use of the secondary sear
acting as an interceptor; and the chance of both these elements of security
failing in the same fire-arm, and at the same time, is remote in the extreme.
The invention may also be applied to hammer-guns the second sear serving as
above described both to lock the ordinary sear and act also as an interceptor.
In order to enable my invention to be fully understood I will now proceed to
describe same by the aid of the accompanying drawing, in which
Fig. 1 is a side elevation of the lock of a hammerless-gun showing one method of
carrying my invention into effect, and
Figs. 2, 3 and 4, are detached detail views of the two sears and the tumbler,
Fig. 2 showing the main sear in side elevation and top and bottom plan views
of same, Fig. 3 similar views of the secondary or locking sear and interceptor,
and Fig. 4 front and rear elevations and an end elevation of the tumbler.
Fig. 5 is a side elevation of a lock showing a slightly modified manner of
applying my invention to hammerless-guns, and
Figs. 6, 7 and 8, are detached detail views of the two sears and the tumbler,
Fig. 6 showing the main sear in side elevation and plan, Fig. 7 the second sear in
side elevation and end elevation, and Fig. 8 the tumbler in side elevation and end
elevation.
Fig. 9 is a side elevation of the lock of a hammer-gun showing a suitable method
of applying my invention thereto, and
Figs. 10, 11 and 12, are detached detail views of the two sears and the tumbler
on the axis of which the external hammer is mounted, Fig. 10 showing the
main sear in side elevation and plan, Fig. 11 the second sear in side elevation,
plan and end elevation, and Fig. 12 the tumbler in side and end elevation and
plan.
Referring first to the arrangement shown in Figs. 1, 2, 3 and 4, A is the main

page_text: sear which engages a bent in the tumbler B, and the rear end a of which is
acted upon by the trigger in the ordinary manner. C is the secondary or
locking sear which also acts as an interceptor. This second sear C is pivoted at c
and its forward end c' is shaped so as to intercept and prevent the descent of
tumbler B until such end is lowered to the position shown in broken lines in
Fig. 1, when the notch or shoulder c' will be out of the line of travel of the head b
of such tumbler. The descent of the end c¹ is caused by the upward pressure of
the trigger on the projection at the rear end of the sear C in the action of
discharging the gun. It will be seen that the rear end of sear C is bent round and
projects forward, and its extreme end, when the sear is in its normal position and
the main sear A is engaged with bent b of tumbler, engages a hook or catch a' on
the under side of such main gear and locks the latter so as to prevent same
releasing the tumbler.
The action is as follows:-When the trigger is pulled it first acts upon the
projection of the second or locking sear and interceptor C, thereby causing same
to turn on its pivot c and removing the extreme end of its rear curved arm from
engagement with the hook or catch a¹ of main sear A, and at same time lowering
its forward end c¹ out of the path of the head of tumbler B. The continued upward
action of the trigger brings same in contact with the rear end a of the main sear A,
and as same is now unlocked it will turn on its pivot and release the tumbler B
which will then descend under the action of its spring, and the gun be thus
discharged.
When the lock is recocked (by the action of closing the gun after recharging)..
the tumbler B is turned back to its original position, thus bringing the forward end
of the second or locking sear C (under the action of its spring D), back to position
to intercept or prevent the descent of the tumbler, and as soon as the main
sear A, under the action of its spring E, enters the bent b of tumbler B, the
rear end of such sear C will engage the hook or catch a' of sear A and so lock
same.
As the intercepting end c' of the second sear C only comes into position for
intercepting the tumbler B after the main sear A has engaged the bent 6 of
tumbler B, and consequently before such main sear is locked, it might possibly
happen that the tumbler in the action of closing the gun would be caused to descend
under the action of its spring, and thus discharge the gun prematurely. In order
to prevent this the forward end of the sear C is provided with a second shoulder c*
which, as the tumbler B turns back to firing position comes into the path of the
head of such tumbler before the main sear engages its bent in the tumbler, and
consequently should the tumbler try to descend it will be intercepted by such
shoulder c*.
Referring now to the arrangement shown in Figs. 5, 6, 7 and 8, the parts are
very similar in construction and action to that previously described, but instead of
the secondary locking and intercepting sear Cengaging the head of tumbler B,
it engages the part 6 on the tail thereof; and further the means for locking the
sear A. consist in a lug on the under side of sear C which engages the catch or
hook a¹ on sear A, (which catch or hook in this case is arranged at right angles to
the body of the main sear), as soon as such main sear engages the bent b of
tumbler B. To prevent the premature descent of tumbler B before the sear A
engages the bent of same, the intercepting end c' of sear C is in a similar manner
to that described in the previous arrangement provided with a shoulder c* and this
will engage a notch 6 on the part 62 of the tumbler should the latter try to descend
before the engagement of the sear A with the latter occurs, and consequently
before such sear A is locked.
Referring now to Figs. 9, 10, 11 and 12, it will be seen that the arrangement is
very similar to that last described, the second sear C engaging the part 6² on the
tumbler B mounted on the pivot of the external hammer (not shown in the
drawing), but the end c' of sear C does not require a second shoulder, to prevent
the premature descent of the hammer before the main sear engages the bent of the

page_text: tumbler, as the notch or bent ³ in part 62 will serve to receive the end c¹ of sear C
in case of need, and thus prevent this occurring.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
==
1. In lock mechanism of fire-arms the employment of a secondary sear serving
both to lock the main sear and to intercept the tumbler, substantially as specified.
2. In lock mechanism of fire-arms the employment of a secondary sear serving
both to lock the main sear and to intercept the tumbler, and provided with
additional means for intercepting the tumbler before the main sear engages its bent
in the tumbler and is locked, substantially as specified.
3. The construction and arrangement of secondary sear C with its forward
end acting as an interceptor for tumbler B by engaging the head of such tumbler,
and its rear end serving to lock the main sear A by engaging a hook or catch
thereon, substantially as described and shown in Figs. 1, 2, 3 and 4, of the
drawings.
4. The construction and arrangement of secondary sear C with its forward end
acting as an interceptor for tumbler B by engaging a recess in the tail of such
tumbler, such sear C also serving to lock the main sear A by means of a lug c³ on.
its underside engaging a hook or catch on such main sear, substantially as described
and shown in Figs. 5, 6, 7 and 8, of the drawings.
5. The construction and arrangement of secondary sear C with its forward end
acting as an interceptor for tumbler B on the axis of which the hammer of a gun is
mounted, by engaging a recess in the tail of such tumbler, such sear C also serving
to lock the main sear A. by means of a lug on its underside engaging a hook or
catch on such main sear, substantially as described and shown in Figs. 9, 10, 11
and 12, of the drawings.
Dated this 7th day of February 1894.
ALLISON BROS.,
Agents for the Applicant.

page_text: Date of Application, 11th May, 1893
Complete Specification Left, 10th Feb., 1894-Accepted, 24th Mar., 1894
PROVISIONAL SPECIFICATION.
Improvements in or connected with the Lock Mechanism of
Fire-arms.
1, WILLIAM MANSFIELD, trading as Joseph Brazier and Sons, of Ashes Works,
Wolverhampton in the County of Stafford, Gun Lock and Action Manufacturer,
do hereby declare the nature of this invention to be as follows:―
In the lock mechanism of hammerless fire-arms it is customary to use a secondary
or intercepting sear which catches the tumbler or striker and prevents the charge
being fired, in case the nose of the main sear is shaken or jarred out of gear with
the bent of the tumbler such as, for instance, by the vibration caused by the
discharge of one of the barrels of a double-barreled gun. When it has happened
that the nose of the main sear has jarred out of gear with the bent of the tumbler,
and the tumbler has consequently been caught and retained by the secondary sear,
it is necessary, before the barrel in connection with which the tumbler is used can
be fired, to re-cock the lock (which involves opening and closing the gun), as the
secondary sear cannot be moved by the trigger out of gear with the tumbler.
considerable time is therefore lost in getting the gun ready for firing, and in
consequence it frequently happens that the second barrel of a double-barrelled gun
cannot be discharged as quickly as is desirable after the first barrel has been
discharged. It is, therefore, of considerable importance that the main sear shall
be prevented from being shaken or jarred out of gear with the bent of the
tumbler.
A
Now, the main object of this invention is, while retaining the secondary sear or
interceptor, in the case of hammerless fire-arms, and thereby securing the
advantages resulting from its usual employment, to modify and improve the con-
struction of the sears in a manner which securely prevents the main sear from
moving until the hinder end of the secondary sear has been raised by the trigger.
The invention comprises, however, also, a simple form of catch, for use chiefly with
hammer locks, for the purpose of preventing the single sear, used with such locks,
from being raised until such catch has been first raised by the trigger; and such
catch may be used with hammerless locks also, in lieu of the secondary sear.
In applying this invention to locks having secondary sears or interceptors, the
main and secondary sears of each lock are formed in such manner that when the
main sear is in engagement with the bent of the tumbler, and the secondary sear
consequently in position to catch the tumbler if it becomes disengaged from the
main sear, a part of the main sear is immediately below or against a part of the
secondary sear or interceptor which is of such shape in relation to the said part of
the main sear, and in such position in relation to the pivot centre of the secondary
sear, that the upward pressure thereagainst, caused by any force tending to raise
the hinder end of the main sear, passes through or approximately through such
pivot centre, and thus there is no tendency of the secondary sear to yield under
such pressure, and the main sear consequently securely prevented from rising.
When the secondary sear is raised by the trigger, the part thereof which prevents
the main sear from rising is drawn clear of the main sear which may then be raised
by the trigger..
In the construction of lock mechanism in which the secondary sear is adapted to
catch a shoulder on the lower end of the tumbler in case the tumbler becomes
accidentally disengaged from the main sear, a convenient form of the invention
consists in forming a sideway projecting lug on the main sear to the rear of its pivot

page_text: and vertically, or approximately vertically, below the pivot centre of the secondary
sear, and in forming a part along the bottom of the secondary sear to come over
and lock the lug and a break at the forward end of such part into which the lug
can rise when such part has been drawn clear of the lug.
In the construction of lock mechanism in which the secondary sear is adapted to
catch the upper portion of the tumbler, in case the tumbler becomes accidentally
disengaged from the main sear, a convenient form of the invention consists in
mounting the secondary sear to work alongside the lock plate, and curving its
hinder end round so as to bring the extreme end forwards into position below its
pivot centre, and in forming a lug on the main sear which projects both downwards
and sideways, and from the lower end of which a nib projects backwards. The
hinder end of the secondary sear is stopped against the lug and itself locks over the
nib which projects from such lug, and thus securely prevents the main sear from
rising until the hinder end of the secondary sear has been drawn back by the
trigger. The secondary sear may be formed with an arm projecting downwards
from its pivot, in lieu of curving the hinder end as described, but the latter
formation allows the hinder end of the sear to pass around the rear portion of the
lock mechanism.
It will be seen that, should the means adopted, according to this invention, for
utilising the secondary sear to prevent the main sear from rising accidentally, fail
from the portions which are interlocked giving way (which is highly improbable),
there still remains the security given by the ordinary use of the secondary sear;
and the chance of both these elements of security failing in the same fire-arm, and
at the same time, is remote in the extreme.
This invention, as it relates specially to hammer locks, consists in applying
thereto, for use with the single sear usually employed, a pivoted catch which
corresponds in essential parts with a secondary sear, adapted as above described for
the purpose of this invention, but with the portion forwards of the pivot removed,
and in adapting the main or single sear to be locked or held down thereby in the
manner in which it is described above as held down by the secondary sear; and
such a catch may be used also with a hammerless lock, if desired, in lieu of
a secondary sear adapted as described, but in such case a part of the security
afforded by the secondary sear is, of course, sacrificed. The catch is pressed down
by a spring as in the case of a secondary sear, and is stopped in its forward position
by a lug on the main sear.
Dated this 10th day of May 1893.
STEPHEN
TKINS,
Wolverhampton, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or connected with the Lock Mechanism of
Fire-arms.
I, WILLIAM MANSFIELD, trading as Joseph Brazier and Sons, of Ashes
Works, Wolverhampton, in the County of Stafford, Gun Lock and Action
Manufacturer, 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 :-
In the lock mechanism of hammerless fire-arms it is customary to use a secondary
or intercepting sear which catches the tumbler or striker and prevents the charge
being fired, in case the nose of the main sear is shaken or jarred out of gear with
the bent of the tumbler such as, for instance, by the vibration caused by the
discharge of one of the barrels of a double-barrelled gun.
When it has happened that the nose of the main sear has jarred out of gear
with the bent of the tumbler, and the tumbler has consequently been caught and

page_text: retained by the secondary sear, it is necessary, before the barrel in connection
with which the tumbler is used can be fired to re-cock the lock (which involves
opening and closing of the gun), as the secondary sear cannot be moved by the
trigger out of gear with the tumbler. A considerable time is therefore lost in
getting the gun ready for firing, and in consequence it frequently happens that the
second barrel of a double-barrelled gun cannot be discharged as quickly as is
desirable after the first barrel has been discharged. It is, therefore, of considerable
importance that the main sear shall be prevented from being shaken or jarred out
of gear with the bent of the tumbler.
Now, the main object of this invention is, while retaining the secondary sear or
interceptor, and thereby securing the advantages resulting from its usual employ-
ment, to modify and improve the construction of the sears in a manner which
securely prevents the main sear from moving until the hinder end of the secondary
sear has been raised by the trigger.
In applying this invention the main and secondary sears of each lock are formed
in such manner that when the main sear is in engagement with the bent of the
tumbler, and the secondary sear consequently in position to catch the tumbler if it
becomes disengaged from the main sear, a part of the main sear is immediately
below or against a part of the secondary sear or interceptor which is of such shape.
in relation to the said part of the main sear, and in such position in relation to the
pivot centre of the secondary sear, that the upward pressure thereagainst, caused
by any force tending to raise the hinder end of the main sear, passes through or
approximately through such pivot centre, and thus there is no tendency of the
Secondary sear to yield under such pressure, and the main sear is consequently
securely prevented fram rising. When the secondary sear is raised by the trigger,
the part thereof which prevents the main sear from rising is drawn clear of the
main sear which may then be raised by the trigger.
It will be seen that, should the means adopted, according to this invention, for
utilising the secondary sear to prevent the main sear from rising accidentally, fail
from the portions which are interlocked giving way (which is highly improbable)
there still remains the security given by the ordinary use of the secondary sear
acting as an interceptor; and the chance of both these elements of security
failing in the same fire-arm, and at the same time, is remote in the extreme.
The invention may also be applied to hammer-guns the second sear serving as
above described both to lock the ordinary sear and act also as an interceptor.
In order to enable my invention to be fully understood I will now proceed to
describe same by the aid of the accompanying drawing, in which
Fig. 1 is a side elevation of the lock of a hammerless-gun showing one method of
carrying my invention into effect, and
Figs. 2, 3 and 4, are detached detail views of the two sears and the tumbler,
Fig. 2 showing the main sear in side elevation and top and bottom plan views
of same, Fig. 3 similar views of the secondary or locking sear and interceptor,
and Fig. 4 front and rear elevations and an end elevation of the tumbler.
Fig. 5 is a side elevation of a lock showing a slightly modified manner of
applying my invention to hammerless-guns, and
Figs. 6, 7 and 8, are detached detail views of the two sears and the tumbler,
Fig. 6 showing the main sear in side elevation and plan, Fig. 7 the second sear in
side elevation and end elevation, and Fig. 8 the tumbler in side elevation and end
elevation.
Fig. 9 is a side elevation of the lock of a hammer-gun showing a suitable method
of applying my invention thereto, and
Figs. 10, 11 and 12, are detached detail views of the two sears and the tumbler
on the axis of which the external hammer is mounted, Fig. 10 showing the
main sear in side elevation and plan, Fig. 11 the second sear in side elevation,
plan and end elevation, and Fig. 12 the tumbler in side and end elevation and
plan.
Referring first to the arrangement shown in Figs. 1, 2, 3 and 4, A. is the main

page_text: sear which engages a bent in the tumbler B, and the rear end a of which is
acted upon by the trigger in the ordinary manner. C is the secondary or.
locking sear which also acts as an interceptor. This second sear C is pivoted at c
and its forward end c is shaped so as to intercept and prevent the descent of
tumbler B until such end is lowered to the position shown in broken lines in
Fig. 1, when the notch or shoulder c² will be out of the line of travel of the head b¹
of such tumbler. The descent of the end c¹ is caused by the upward pressure of
the trigger on the projection c³ at the rear end of the sear C in the action of
discharging the gun. It will be seen that the rear end of sear C is bent round and
projects forward, and its extreme end, when the sear is in its normal position and
the main sear A is engaged with bent b of tumbler, engages a hook or catch a¹ on
the under side of such main sear and locks the latter so as to prevent same
releasing the tumbler.
The action is as follows:-When the trigger is pulled it first acts upon the
projection of the second or locking sear and interceptor C, thereby causing same
to turn on its pivot c and removing the extreme end of its rear curved arm from
engagement with the hook or catch a¹ of main sear A, and at same time lowering
its forward end c' out of the path of the head of tumbler B. The continued upward
action of the trigger brings same in contact with the rear end a of the main sear A,
and as same is now unlocked it will turn on its pivot and release the tumbler B
which will then descend under the action of its spring, and the gun be thus
discharged.
When the lock is recocked (by the action of closing the gun after recharging).
the tumbler B is turned back to its original position, thus bringing the forward end
of the second or locking sear C (under the action of its spring D), back to position
to intercept or prevent the descent of the tumbler, and as soon as the main
sear A, under the action of its spring E, enters the bent b of tumbler B, the
rear end of such sear C will engage the hook or catch a¹ of sear A and so lock
same.
As the intercepting end c¹ of the second sear C only comes into position for
intercepting the tumbler B after the main sear A. has engaged the bent 6 of
tumbler B, and consequently before such main sear is locked, it might possibly
happen that the tumbler in the action of closing the gun would be caused to descend
under the action of its spring, and thus discharge the gun prematurely. In order
to prevent this the forward end of the sear C is provided with a second shoulder c
which, as the tumbler B turns back to firing position comes into the path of the
head of such tumbler before the main sear engages its bent in the tumbler, and
consequently should the tumbler try to descend it will be intercepted by such
shoulder c*.
Referring now to the arrangement shown in Figs. 5, 6, 7 and 8, the parts are
very similar in construction and action to that previously described, but instead of
the secondary locking and intercepting sear Cengaging the head 6' of tumbler B,
it engages the part 6' on the tail thereof; and further the means for locking the
sear A consist in a lug c on the under side of sear C which engages the catch or
hook a¹ on sear A, (which catch or hook in this case is arranged at right angles to
the body of the main sear), as soon as such main sear engages the bent b of
tumbler B. To prevent the premature descent of tumbler B before the sear A
engages the bent of same, the intercepting end c' of sear C is in a similar manner
to that described in the previous arrangement provided with a shoulder c* and this
will engage a notch 63 on the part 6' of the tumbler should the latter try to descend
before the engagement of the sear A with the latter occurs, and consequently
before such sear A is locked.
Referring now to Figs. 9, 10, 11 and 12, it will be seen that the arrangement is
very similar to that last described, the second sear C engaging the part 6* on the
tumbler B mounted on the pivot of the external hammer (not shown in the
drawing), but the end c' of sear C does not require a second shoulder, to prevent
the premature descent of the hammer before the main sear engages the bent of the

page_text: tumbler, as the notch or bent in part 62 will serve to receive the end c¹ of sear C
in case of need, and thus prevent this occurring.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In lock mechanism of fire-arms the employment of a secondary sear serving
both to lock the main sear and to intercept the tumbler, substantially as specified.
2. In lock mechanism of fire-arms the employment of a secondary sear serving
both to lock the main sear and to intercept the tumbler, and provided with
additional means for intercepting the tumbler before the main sear engages its bent
in the tumbler and is locked, substantially as specified.
3. The construction and arrangement of secondary sear C with its forward
end acting as an interceptor for tumbler B by engaging the head of such tumbler,
and its rear end serving to lock the main sear A by engaging a hook or catch
thereon, substantially as described and shown in Figs. 1, 2, 3 and 4, of the
drawings.
4. The construction and arrangement of secondary sear C with its forward end
acting as an interceptor for tumbler B by engaging a recess in the tail of such
tumbler, such sear C also serving to lock the main sear A by means of a lug c on
its underside engaging a hook or catch on such main sear, substantially as described
and shown in Figs. 5, 6, 7 and 8, of the drawings.
5. The construction and arrangement of secondary sear C with its forward end
acting as an interceptor for tumbler B on the axis of which the hammer of a gun
mounted, by engaging a recess in the tail of such tumbler, such sear C also serving
to lock the main sear A. by means of a lug on its underside engaging a hook or
catch on such main sear, substantially as described and shown in Figs. 9, 10, 11
and 12, of the drawings.
Dated this 7th day of Habruan 1001
ALLISON BROS.,
Agents for the Applicant.