IMPROVEMENTS IN SAFETY LAMPS
Year: 1880

page_text: LETTERS PATENT to Carl Kesseler, of 63, Mohrenstrasse, Berlin, W., in the
"
Empire of Germany, Civil Engineer and Patent Solicitor, for an Invention of
IMPROVEMENTS IN SAFETY LAMPS." A communication from Wilhelm Schroeder,
Engineer, of Dortmund, in the Empire of Germany.
PROVISIONAL SPECIFICATION left by the said Carl Kesseler at the Office
of the Commissioners of Patents on the 23rd March 1880.
"
CARL KESSELER, of 63, Mohrenstrasse, Berlin, W., in the Empire of Germany,
Civil Engineer and Patent Solicitor. IMPROVEMENTS IN SAFETY LAMPS." A com-
munication from Wilhelm Schroeder, Engineer, of Dortmund, in the Empire of
Germany.
The improvement consists in the method of closing and securing the lamp, and is
as follows:-
The lamp body or reservoir, preferably of brass, is concd at the top, and over this
cono fits a collar, also preferably of brass, to which the upper portion of the lamp is
attached. Round the outside of this collar fits a thin collar, which is free to turn
round on the first collar, being kept from falling off by a flange on the lower part
and a suitable ring put in position after the movable one, and secured in any con-
venient manner, as, for instance, by solder.
The movable collar carries a lug or tongue on one side, and is slotted on the
other, the slot being in form of that commonly used for securing bayonets. A lug-
or tongue projects from the side of the reservoir, and opposite to it is another pro-
jection, or pin-holes are bored in both the lugs. To fasten the two parts together
the top part is placed over the cone of the lower part, the vertical end of the slot in
the movable ring passes over the pin of the reservoir, the ring is then turned side-
ways till the two lugs come into place one over the other, and a rivet being placed
through the two holes and headed on both sides, the lamp cannot be opened unless
the rivet is cut or knocked out. The rivets are preferably inade of soft metal, like
lead, and each may bear a number.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Carl Kesseler in the Great Seal Patent Office on the 22nd
September 1880.
CARL KESSELER, of 63, Mohrenstrasse, Berlin, W., in the Empire of Germany,
Civil Engineer and Patent Solicitor. "IMPROVEMENTS IN SAFETY LAMPS." A com-
munication from Wilhelm Schroeder, Engineer, of Dortmund, in the Empire of
Germany.
The improvement consists in the method of closing and securing the lamp, and is
as follows:-
The lamp body or reservoir, preferably of brass, is coned at the top, and over this
cone fits a collar, also preferably of brass, to which the upper portion of the lamp is
attached. Round the outside of this collar fits a thin collar, which is free to turn
round on the first collar, being kept from falling off by a flange on the lower part
of the fixed collar and a suitable ring put in position after the moveable one, and
secured in any convenient manner, as, for instance, by solder.
The movable collar carries a lug or tongue on one side, and is slotted on the
other, the slot being in form of that commonly used for securing bayonets. A lug
or tongue projects from the side of the reservoir, and opposite to it is another pro-
jection, or pin-holes are bored in both the lugs. To fasten the two parts together
the top part is placed over the cone of the lower part, the vertical end of the slot in
the movable ring passes over the pin of the reservoir, the ring is then turned round
till the two lugs come into place one over the other, and a rivet being placed through
the two holes and headed on both sides, the lamp cannot be opened unless the rivet
is cut or knocked out. The rivots are preferably made of soft metal, like lead, and
cach may bear a number.
Reference being had to the accompanying Drawings, Fig 1 is a sectional cleva-
tion; Figs. 2 and 3, elevations of the lamp showing the "bayonet-joint" fastening
and the rivetting lugs respectively; and Fig. 4, a sectional plan upon line v, w, of
Fig. 1.
The lamp body A is the vessel containing the oil; its upper part is turned down
to a cone; to this the ring B is fitted in such a manner that no air can reach the
flame through it. To enable the parts A and B to be firmly connected there is a
second ring C laid over the ring B; the ring C is provided on one side with the
tongue or lug D, and on the other side with a slot E.
The lamp body A also is provided with a tongue or lug G, and carries on
the opposite side and on its coneshaped part a shoulder or projection H. The
ring C is held in position at the bottom by a flange of the ring B, and at the top
by a hoop R, which is soldered on, so that the ring is perfectly free to turn in an
horizontal direction, but can not be moved either downwards or upwards. The
slot in the ring B exactly corresponds to the projection or shoulder provided
upon A. The projecting parts of the tongues or lugs have a funnel shaped hole
drilled into them.
When the parts A and B have been fitted to one another the closing is effected
in the following manner:-The ring O is turned round so far that the tongue D
just covers the tongue G, and that the holes in these tongues stand exactly one
above the other. This rotating movement will cause the slot on the side opposite
to the tongue or lug D to travel over the shoulder H in the wellknown inanner used
for attaching bayonettes. The two tongues or lugs are now rivetted together by
means of a metal-pin.
The tongues being rivetted together will prevent the workman unnecessarily
opening the lamp. The workman is not in a position to open the lamp without
this being noticed by the controle. Every rivet is put in by the controle before the
descent into the mine, and bears its number or mark. The miner has to return the
lamp in the same state as he receives it, and every damage to the lead rivet renders
him liable to punishment.

page_text: CLAIMS.
Having now described my Invention and the method of performing the same, I
wish it to be understood that what I believe to be new and desire to protect under
the hereinbefore in part recited Letters Patent is,—
The herein described fastening for safety lamps, consisting essentially of the conc
shaped seating with fixed collar and movable ring, the latter provided at one part
with a "bayonet-joint" fastening, and at another part carrying a perforated pro-
jecting lug or tongue capable of being rivetted to a corresponding lug or tongue
upon the lamp body, substantially as and for the purposes set forth and shown in
the accompanying Drawings.
In witness whereof, I, the said Carl Kesseler, have hereunto set my hand and
seal, this Seventeenth day of September, in the year of our Lord Onc
thousand eight hundred and eighty.
CARL KESSELER. (L.S.)