IMPROVEMENTS IN SAFETY LAMDO BAD OF IN MINES AND OTHER LOCALITIES
Year: 1865

page_text: LETTERS PATENT to Henri Adrien Bonneville, of the British and Foreign
Patent Offices, 24, Rue du Mont Thabor, Paris, in the Empire of
France, and 88, Porchester- Terrace, Bayswater, in the County of
Middlesex, Patent Agent, for the Invention of "IMPROVEMENTS IN SAFETY
LAMDO BAD OF IN MINES AND OTHER LOCALITIES."-A communication from
Sealed the 2nd March 1866, and dated the 16th September 1865.
PROVISIONAL SPECIFICATION left by the said Henri Adrien Bonneville
at the Office of the Commissioners of Patents, with his Petition, on the
16th September 1865.
I, HENRI ADRIEN BONNEVILLE, of the British and Foreign Patent Offices,
24, Rue du Mont Thabor, Paris, in the Empire of France, and 38, Por-
chester Terrace, Bayswater, in the County of Middlesex, Patent Agent, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN SAPETY
LAMPS FOR USE IN MINES AND OTHER LOCALITIES," a communication from André
Jean Olanier, a person residing at Rue du Sentier, Paris, in the Empire of
France, to be as follows:-
The object of this Invention is to render it impossible to open safety lamps
or remove the wire gauze without extinguishing the flame. This is attained

page_text: by placing near the burner an extinguisher of a suitable form placed on a
small lever arm, acted on by a spring tending to bring it down on the burner,
and with a catch which retains it when raised. The wire gauze cover of the
lamp being placed on the latter is turned in order to fix in a groove which it
bears two small projecting pins fixed in the upper part of the oil reservoir,
and in turning disengages, by means of pins placed at its inner surface, the
catch retaining the extinguisher. The small arm carrying the extinguisher
then only bears against the inside of the wire gauze cover, and is supported by
it. But in order to remove the cover it is necessary to turn it quite round,
and as on the way the lever arm meets with a hollow its end is disengaged
and the extinguisher falls. The accidental turning of the wire gauze cover,
and consequent extinction of the lamp, is provided against by a suitable
holder or stand, which, opening only by means of a key, offers additional
security against imprudent efforts to open the lamp.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Henri Adrien Bonneville in the Great Seal Patent Office on
the 12th March 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRI
ADRIEN BONNEVILLE, of the British and Foreign Patent Offices, 24, Rue du
Mont Thabor, Paris, in the Empire of France, and 38, Porchester Terrace,
Bayswater, in the County of Middlesex, Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Sixteenth day of September, in the year of our Lord
One thousand eight hundred and sixty-five, in the twenty-ninth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Henri Adrien Bonneville, Her special licence that I, the said Henri
Adrien Bonneville, my executors, administrators, and assigns, or such others
as I, the said Henri Adrien Bonneville, my executors, administrators, and
assigns, should in any time agree with, and no others, from time to time and
at all times thereafter during the term therein expressed, should and lawfully
might make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention for
"IMPROVEMENTS IN SAFETY LAMPS FOR USE IN MINES AND OTHER LOCALITIES,"
communication from André Jean Olanier, a person residing at Rue du
Sentier, Paris, in the Empire of France aforesaid, upon the condition

page_text: (amongst others) that I, the said Henri Adrien Bonueville, my executors
and administrators, by an instrument in writing under iny, or their, or one
of their hands and seals, should particularly describe and ascertain the nature
of the said Invention, and in what manner the same was to be performed,
and cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said Henri Adrien Bonneville, do hereby
declare the nature of the said 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 improved construction of safety lamp dis-
tinguished from the numerous systems hitherto devised by its great simplicity
and the certainty with which it produces the effect required in this kind of
apparatus, viz., the extinction of the flame before the removal of the wire
gauze protecting cover.
The improved lamp is provided with a mechanical arrangement causing the
flame to be extinguished before the wire gauze cylinder can be removed,
and rendering it impossible to place the same in contact with the surround-
ing air.
In the accompanying Drawings, which will very clearly show the principle
and construction of the improved apparatus, Fig. 1 is an elevation of the lamp
entire; Fig. 2, a partial elevation on a larger scale of the lamp, the cage
being removed, showing in section the metal ring or virole which carries the
wire gauze cylinder; in this view the extinguisher is raised; Fig. 3, plan
from below of the lamp and ring, showing the extinguisher lowered.
a, oil reservoir; b, wick holder with opening for the passage of the wire
used for snuffing and raising the wick; c, wire serving for snuffing as in
ordinary safety slamps; d, hinged extinguisher formed of a circular disk pro-
vided with an interior ledge or projection intended when lowered for covering
the wick holder; this disk is carried by a lever which turns on a horizontal
axis, and has at its extremity a notch serving for maintaining the extinguisher
raised; e, small metal upright placed vertically on the cover of the oil reser-
voir a, and between the two branches of which is placed the pivot of the
5 extinguisher lever; f, metal tongue piece placed behind the upright e and
oscillating around an axis, whose direction is perpendicular to the pivot of the
extinguisher lever, the point of this tongue piece enters the notch of this lever
in order to keep it raised.

page_text: Figure 2 shows a spring wound cylindrically on the pivot of the extinguisher,
and fixed by one of its extremities to the pivot, and by the other to the lever
of the extinguisher, so as to tend to bring it down on the wick so soon as the
tongue fescapes from the notch. g, virole or ring carrying the wire gauze
cylinder; h, projecting ring placed at the upper part of the oil reservoir, on
which the virole g slides; i, i, small projecting parts on the ring placed at
the extremities of the diameter contained in the vertical plan, which. passes
through the axis of rotation of the tongue piece f. These projecting pieces
when the cylinder is placed on the lamp should be made to enter two corre-
sponding openings in the virole g, Fig. 2, and by turning insert themselves in
an annular slot formed in the same, so as to ensure the contact of the two
obturating surfaces. j, projection or rib placed, inside the virole g, and
presenting, as shown in Fig. 3, an opening sufficient for the passage of the
two branches of the upright e; under this projection the extremity of the
extinguisher is held when the tongue piece has escaped from the notch, until
by turning the ring the upright presents itself to the empty space existing in
this ring; k, k, other projecting pieces like small teeth on each side of the
empty part of the rib j, Fig. 2; they form part of the virole g, are directed
towards the wick holder according to the circumferential rays, and are
intended, when the virole g is turned to the right or left in order to remove it,
to disengage the tongue piece from the notch in the extinguisher lever. It
is only at the moment when the upright is brought opposite the empty space
existing in the ribj that the projections i, i, present themselves opposite the
openings of the groove by which they have previously entered, and that the
cylinder can be removed; but then, the end of the lever being no longer
supported by the rib, the extinguisher d falls an instant before and puts out
the lamp. 1, Fig. 1, sleeve covering the lamp when provided with the wire
gauze cover; m, cap provided with a ring for hanging the lamp, and attached
to the sleeve by four vertical rods; n, hinged bridle or spring bar closing by
means of a lock aud key, and serving for retaining the lamp in the sleeve l; o,
small box, forming part of the sleeve, in which the spring catch n locks itself,
and can only be withdrawn by the use of the key.
Having thus described the nature of the said Invention, I would have it
understood that I do not claim the whole or any of the parts usually employed
in safety lamps of ordinary construction; but what I claim and believe to
be new and original therein is, the arrangement and combination of the
mechanism intended for extinguishing the flame an instant before the removal
of the metallic wire gauze, and consequent exposure of the flame to the sur-

page_text: rounding air, substantially in the manner above described and represented in
the accompanying Drawings.
In witness whereof, I, the said Henri Adrien Bonneville, have hereunto
set my hand and seal, this Ninth day of March, in the year of our
Lord One thousand eight hundred and sixty-six.
H. BONNEVILLE. (L.S.)