Year: 1889

page_text: I HENRY EDWARD NEWTON of the Office for Patents, 6 Bream's Buildings Chancery
Lane in the County of Middlesex, Civil Engineer, 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 :-
This invention relates to an improvement in locks for fire arms specially adapted
to revolvers, and in which connection the invention is illustrated, and it relates
particularly to that class which are made self cocking by the pull of the trigger, that
is, so that the pull upon the trigger will bring the hammer to full cock position, and
then a further pull of the trigger will release the hammer for discharge, it being
specially adapted for concealed hammers, the object being to mechanically indicate.
when the hammer has reached the full-cock position, so that the operator may, if he
chooses, hold the hammer in that position before continuing the pull of the trigger
to produce discharge, and the invention consists in the combination of elements.
hereinafter described, and particularly recited in the claim.
In the accompanying drawings:-
Fig. 1 represents a sectional view of a revolver, showing side view of the. lock.
mechanism in the normal position.
Fig. 2 the same parts with the hammer thrown to the full cock position.
Fig. 3 top view of the trigger, showing the dog as hinged therein.
Fig. 4 vertical section of the trigger, showing side view of the dog.
Fig. 5 top view of the frame on a reduced scale.
Fig. 6 sectional view of a revolver, showing side view of the mechanism in a
modified form, the parts in the normal position.
Fig. 7 side view of the modified dog detached.

page_text: A represents a frame of a revolver, and B the hammer hung upon a pivot C.
Under this arrangement, the hammer is enclosed entirely within the frame, and is
provided with a firing pin D, hinged to the hammer so as to move with it, as
indicated in Figs. 1 and 2.
E represents the main spring, which is hung to the hammer in rear of its pivot in
the usual manner. F represents the trigger, which is hung upon a pivot G forward
of the hammer, and is constructed with the usual finger piece H. To the hammer,
and forward, and above its pivot, a strut I is hinged, as at J; the strut, extending
downward, is provided with a spring K, the tendency of which is to force the lower
end or nose of the strut I forward over the trigger.
a tail N
Upon the upper side of the trigger, and in rear of its pivot, a dog L is hung, as
at M; the nose a of the dog normally stands below the strut I, and so that the strut,
in its forward position, stands directly over the dog, as seen in Fig. 1. The under
side of the dog, at its rear, is constructed to take a bearing upon the trigger as at b,
and so that the dog is prevented from turning rearward out of its normal position;
hence, when the trigger is pulled, as from the position in Fig. 1 to that seen in
Fig. 2, the dog bears against the end of the strut, and forces the hammer to its
cocked position, as seen in Fig. 2. From the forward sido of the dog,
extends, and in the frame is a bearing point or shoulder O, in the path of the tail of
the dog, as the trigger is pulled, to bring the hammer to its cocked position. As the
hammer reaches the cocked position, as seen in Fig. 2, the tail N of the dog will
strike the shoulder or bearing O in the frame. The pull of the trigger being
continued, the dog will operate as a lever, the stationary bearing O being a fulcrumi,
and thus the nose of the dog will be thrown forward, as indicated in broken lines,
Fig. 2, and permit the strut to escape therefrom and the hammer to be thrown
forward.
As the trigger is released, the dog descends with it, the strut yielding for the
descent of the dog until it has passed below the strut; then the strut will be thrown
forward over the dog to the normal position, as seen in Fig. 1, ready for the next
pull.
The leverage of the trigger upon the strut in the pull from the normal position to
the full cocked position is the greatest, but as soon as the tail of the dog comes upon
the stationary bearing O in the frame, then the leverage is reduced sufficient to
indicate to the finger pulling the trigger, that an interruption has occurred. This
interruption indicates the full-cock position of the hammer, so that the operator may
readily pull the trigger until this interruption occurs, and there hold, if desirable,
until such time as aim may be taken, or the completed pull is required. If this is
not required, then the hammer may be let down to its rebound position without
striking the primer of the cartridge, for if the trigger and the hammer are thus
allowed to descend before the point of the strut escapes from the nose L of the
trigger dog, the position of the rebound lever P is such, that it positively prevents
the point of the firing pin from reaching the primer.
This rebound lever P is a well known device for this purpose, and as it does not
materially qualify the present invention, a full description of its operation herein is
unnecessary.
It will he understood that the tail of the trigger dog may be made shorter or
longer, thereby correspondingly increasing or reducing the power required for the
final pull of the trigger.
The dog is preferably hung in a recess in the upper side of the trigger, as
indicated in Figs. 1 and 4, and so that the dog presents a broad surface to operate
against the strut.
The hand or pawl for imparting rotation to the cylinder is omitted, as its presence
would somewhat obscure the illustration.
The hammer opening in the top of the frame is closed by a flange R, which
extends from the side plate on the case, as seen in Fig. 5.
The strut by which the movement of the trigger is imparted to the hammer, is
represented as hinged to the hammer, but the dog may be inade to operate directly

page_text: upon the hammer, without the interposition of the strut, as seen in Figs. 6, 7, and 8,
Fig. 6 representing the parts in the normal position, and Fig. 7 as in the cocked
position, when the tail of the dog has come to its bearing, broken lines indicating the
complete pull for discharge.
The invention, although illustrated only with reference to a concealed hammer,
is equally applicable to fire-arms with exposed hammers.
The illustration of the invention, as applied to locks for revolvers, will be sufficient
to enable others skilled in the art to apply the mechanism to other arrangements of
firearms.
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 correspondents, I declare that what I claim is :-
1. In a firearm, the combination of a hammer hung upon a pivot in the frame, a
trigger hung forward of the hammer, a dog hung upon the trigger in rear of its
pivot, the nose of the dog extending upward, a shoulder on the trigger to arrest the
rear movement of the dog, a tail extending forward from the dog, the nose of the
dog adapted to engage the hammer on the pull of the trigger, a stationary bearing
in the frame in the path of the tail of the dog, and against which bearing the tail of
the dog will strike as the hammer is brought to the full cocked position, and before
its release, substantially as described.
2. In a firearm, the combination of the hammer B hung upon a pivot in the frame,
a strut I hinged to the hammer above and forward of its pivot, the said strut
extending downward and provided with a spring, the tendency of which is to turn
the strut forward, the trigger hung in the frame forward of the hammer, the dog L
hung upon the trigger in rear of its pivot, the trigger constructed with a bearing b
against which the dog rests in its normal position, the dog extending upward, its
nose adapted to engage the lower end of said strut, and provided with a forwardly
projecting tail N, and a stationary bearing O in the frame in the path of the tail
of the dog, substantially as and for the purpose described.
Dated this 30th day of April 1889.
NEWTON & SON,
Agents for the Applicant.