Year: 1888

page_text: I, JEAN BAPTISTE GUSTAVE ADOLPHE CANET, of 91 Avenue Malakoff, Paris, France,
Civil Engineer, do hereby declare the nature of this invention, to be as follows:-
•
The present invention relates to improvements on the apparatus described in my
prior Patent No. 9453 dated 4th July 1887, and consists in a new arrangement of the
breech screw and the firing mechanism.
In order to enable the invention to be readily understood I will now proceed to
describe same by the aid of the accompanying drawings, in which
Figs. 1 and 2 are respectively an end and a side elevation of the breech screw.
Fig. 3 is a section through the axial. vent, and
Fig. 4 shows in detail the heel at the end of the working lever."
I impart the rotary and longitudinal movements to the breech screw, by the simple
rotary movement of the operating lever.
Instead of cutting the surface of the breech screw A into straight segments limited
by the generating lines of the cylinder, I employ segments of helicoidal form--8 of
which are shown in the drawing-four being full, while the other four are cut away.
Two of the cut away segments have a central helicoidal groove B, with which engage
rollers C, C, let into the screw carrier.
When a rotary movement is imparted to the breech screw A, during the first eighth
of such rotation the screw-threaded segments are disengaged from their counterpart,
leaving the screw free.
During this time the rollers C, C¹, travel along a portion of the helicoidal groove
which is parallel to the inclination of the threads of the screw. During the continua-
tion of the rotary movement the rollers C, C', engage the part of the helicoidal

page_text: groove B which has a great inclination, and as they are stationary, the breech screw
receives a longitudinal movement in the direction of the axis, causing it to draw out of
the gun.
The breech is closed by turning the hand lever in the reverse direction.
Another important improvement that I have made in the breech mechanism consists
in the following arrangement:-
:-
The axis of the hand lever D carries a cam F, which when the breech is quite closed
is opposite an opening G formed in the carrier.
When the hand lever is raised the cam Facts upon the end of the firing slide H
and makes it travel downwards. This motion cocks the hammer, by means of the
rack I, at the same time that it acts on the tail of the extractor J.
In its descent the firing slide compresses the spiral spring K which will work the
slide back when the lanyard is pulled. The latter is fixed at L to a hook or projection
on the trigger.
In order to keep the hand lever steady during the movement of the breech screw and
its disengagement to one side, I provide this lever with a heel piece M which bears
against a small spring pawl or catch N inserted in the breech screw.
When the breech is closed this pawl or catch is held by the edge of the full segment
of the carrier in the position N', and the hand lever can turn freely.
If the breech screw is turned the pawl or catch arrives opposite a cut away segment
of the carrier, the spring acts and causes the nose of this pawl or catch to engage
under the heel piece M of the hand lever, which can no longer be turned down; it is.
only at the moment of the closing of the screw, when the last eighth of a revolution is
effected, which causes the screw to engage with its counterpart, that the inclined
plane O, which joins the full segment with the cut away segment of the carrier, lowers
the pawl or catch, and renders the hand lever free.
It will be readily understood that the materials, proportions and dimensions, as well
as the accessory arrangements may be varied without departing from my invention,
which may be applied to any system of guns, without or with metallic cartridges; in
the latter case an ordinary extractor being added to the screw.
T: 10:1 1
1000

page_text: I, JEAN BAPTISTE GUSTAVE ADOLPHE CANET, of 91 Avenue Malakoff, Paris, France,
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:-
The present invention relates to improvements on the apparatus described in Patent
No. 9453 dated 4th July 1887, and consists in a new arrangement of the breech screw
and the firing mechanism.
In order to enable the invention to be readily understood I will now proceed to
describe same by the aid of the drawings filed with the provisional specification, in
which
Figs. 1 and 2 are respectively an end and a side elevation of the breech screw.
Fig. 3 is a section through the axial vent, and
Fig. 4 shows in detail the heel at the end of the working lever.
I impart the rotary and longitudinal movements to the breech screw, by the simple
rotary movement of the operating lever.
Instead of cutting the surface of the breech screw A into straight segments limited
by the generating lines of the cylinder, I employ segments of helicoidal form-8 of
which are shown in the drawing-four being full, while the other four are cut away.
Two of the cut away segments have a central helicoidal groove B, with which engage
rollers C, C', let into the screw carrier.
When a rotary movement is imparted to the breech screw A, during the first eighth
of such rotation the screw-threaded segments are disengaged from their counterpart,
leaving the screw free..
During this time the rollers C, C', travel along a portion of the helicoidal groove
which is parallel to the inclination of the threads of the screw. During the continua-
tion of the rotary movement the rollers C, C¹, engage the part of the helicoidal
groove B which has a great inclination, and as they are stationary, the breech screw
receives a longitudinal movement in the direction of the axis, causing it to draw out of
the gun.
The breech is closed by turning the hand lever in the reverse direction.
Another important improvement that I have made in the breech mechanism consists
in the following arrangement :-
The axis of the hand lever D carries a cam F, which when the breech is quite closed
is opposite an opening G formed in the carrier.
When the hand lever is raised the cam F acts upon the end of the firing slide H and
makes it travel downwards. This motion cocks the hammer, by means of the rack I,
at the same time that it acts on the tail of the extractor J.
In its descent the firing slide compresses the spiral spring K which will work the
slide back when the lanyard is pulled. The latter is fixed at L to a hook or projection
on the trigger.

page_text: "
In order to keep the hand lever steady during the movement of the breech screw
and its disengagement to one side, I provide this lever with a heel piece M which bears
against the small spring pawl or catch N inserted in the breech screw.
When the breech is closed this pawl or catch is held by the edge of the full segment
of the carrier in the position N', and the hand lever can turn freely.
If the breech screw is turned the pawl or catch arrives opposite a cut away
segment of the carrier, the spring acts and causes the nose of this pawl or catch to
engage under the heel piece MI of the hand lever, which can no longer be turned down ;
it is only at the moment of the closing of the screw, when the last eighth of a revolution
is effected, which causes the screw to engage with its counterpart, that the inclined
plane O, which joins the full segment with the cut away segment of the carrier, lowers
the pawl or catch, and renders the hand lever free.
It will be readily understood that the materials, proportions and dimensions, as well
as the accessory arrangements may be varied without departing from my invention,
which may be applied to any system of guns, without or with metallic cartridges; in
the latter case an ordinary extractor being added to the screw.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The improved construction consisting in cutting on the face of the breech
screw helicoidal screw threaded segments, the segments without screw threads having
a groove with which fixed rollers engage, such construction enabling the disengage-
ment and the backward movement of the breech screw to be effected by the simple
rotary movement of the hand lever from left to right.
2. The construction of firing slide and the automatic cocking and extractor
mechanism.
3. The construction of the hand lever permitting it to be held immovable while the
breech is being opened and closed.
4. The accessory arrangements of the apparatus above described.
Dated this 21st day of December 1888.