Improvements in the Construction of Obturators for Ordnance.
Year: 1890

page_text: Date of Application, 20th June, 1890
Complete Specification Left, 15th Apr., 1891-Accepted, 16th May, 1891
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Obturators for Ordnance.
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:--
My present invention relates to improvements which 1 have made in the
construction of obturators to be adapted to the movable breeches of ordnance.
Hitherto in all systems of obturation where a pad of greased asbestos has been
used as a plastic obturator, such pad has been held both in front and in the rear
by a tin or copper cup, and by a ring in the angles. In certain cases I have made
use of obturators in which a steel cup alone was employed without a ring but
whatever advantages I may have obtained by such arrangement, I have still further
simplified the system, by entirely suppressing the cup, and by employing only a
ring. This ring will be of a suitable section and made of very elastic metal,
preferably steel, and it is centred on a cylindrical part carried by the fore end of
the breech screw, or formed on the rear of the movable head.
I may modify the method of centreing described, notably by centreing the ring
upon the plastic pad itself. In this case hardened steel washers will be interposed
between the ring and the breech screw.
Finally, I may also employ an arrangement in which the ring is centred upon a
metallic washer placed in front of the screw or behind the movable head, and for
certain obturators I may hold the ring in place by means of an annular collar fixed
in front of the breech screw or behind the movable head.
Dated this 20th day of June 1890.
ALLISON BRŪS.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Construction of Obturators for Ordnance.
1, 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 :-
My present invention relates to improvements which I have made in the con-
struction of obturators to be adapted to the movable breeches of ordnance.
Hitherto in all systems of obturation where a pad of greased asbestos has been
used as a plastic obturator, such pad has been held both in front and in the rear
by a tin or copper cup, and by a ring in the angles.
In certain cases I have made use of obturators in which a steel cup alone was
employed without a ring; but whatever advantages I may have obtained by such
arrangement, 1 have still further simplified the system by entirely suppressing the
cup, and by employing only a ring.
In the accompanying drawings Figs. 1, 2, 3, and 4, are vertical sections showing
different methods of carrying my invention into effect
The ring a will be of a suitable section and made of very elastic metal, pre-
ferably steel, and it is (as shown in Fig. 1) centred on a cylindrical part 6¹
carried by the fore end of the breech screw b, or formed on the rear of the
movable head f
I may modify the method of centreing described notably by centreing the ring a
Si Gil

page_text: upon the plastic pad 7 itself, as shown in Fig. 2. In this case hardened steel
washers e will be interposed between the ring and the breech screw.
Finally, I may also employ the arrangement shown in Fig. 3, in which the ring a
is centred upon a metallic washer d placed in front of the screw or behind the
movable head, and for certain obturators I may, as shown in Fig. 4, hold the
ring a in place by means of an annular collar e fixed in front of the breech screw
or behind the movable head.
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 obturator in which the cup is abolished and replaced by a
single ring of highly elastic metal, preferably steel.
2. The different methods of centreing the ring referred to in Claim 1, substantially
as described and shown in the drawings.
3. Any mere modifications in the details, form and dimensions of the arrange-
ments shown and described.
1
יי
ALLISON BROS.,
Agents for the Applicant.