IMPROVEMENTS IN LAMPS FOR BURNING EXPLOSIVE OIL
Year: 1877

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine, Lake
& Co., Patent Agents, Southampton Buildings, London, for the Invention of
"IMPROVEMENTS IN LAMPS FOR BURNING EXPLOSIVE OIL." A communica
tion from abroad by John Henry Lewars, of Philadelphia, Pennsylvania;
United States of America.
ealed the 6th October 1877, and dated the 21st May 1877.
PROVISIONAL SPECIFICATION left by the said William Robert Lake at the
Office of the Commissioners of Patents on the 21st May 1877.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. " IMPROVEMENTS IN LAMPS FOR BURNING
EXPLOSIVE OIL." [A communication from abroad by John Henry Lewars, of Phila-
delphia, Pennsylvania, United States of America.]
This Invention consists in placing an improved safety valve, in the collar of a
lamp intended for the burning of liquid hydrocarbons or explosive oils. The said
collár may be fixed in any suitable manner to the neck of the oil chamber, or made
detachable, and it may be adapted for attachment to various sizes of lamps,
The said Invention is applicable not only in the manufacture of new lamps with
rigidly fixed collars, but also to any existing lamps without requiring any change
in their present construction.
The said valve is formed of a single piece of sheet metal, soldered, brazed, or
pinned by one end to the lamp collar, and either lying flat upon its surface, or,
preferably, placed in a countersunk recess of suitable shape and depth to receive it,
so that the surface of the valve shall be flush with the surface of the collar, and
present no projection to render it liable to injury.
An independent or supplemental collar is used as the means for applying a safety
valve to existing lamps without removing or altering their fixed collars. This
supplemental collar may be made of any required diameter, to suit the sizes of the
lamps to which it is desired to apply the same. It forms a gas chamber above the
lamp, and it is provided with a valve of precisely the same character as the valve
applied to the fixed collar. Both ends of the collar are tapped, so that it may be
screwed by its lower opening upon the fixed collar of the lamp, and may receive the
burner on its upper.opening...

page_text: The object of this Invention is to provide a safe escape for the explosive gases
from the oil chamber of the lamp, or the gas chamber formed by the collar.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Robert Lake in the Great Seal Patent Office on the 21st
November 1877.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. " IMPROVEMENTS IN LAMPS FOR BURNING
EXPLOSIVE OIL." A communication from abroad by John Henry Lewars, of Phila-
delphia, Pennsylvania, United States of America..
This Invention relates to lamps for burning explosive oil, and consists partly in
placing an improved safety valve in the collar of a lamp intended for the burning
of liquid hydrocarbons or explosive oils. The said collar may be fixed in any
suitable manner to the neck of the oil chamber, or may be made detachable, and it
may be adapted for attachment to various sizes of lamps.
The said Invention is applicable not only in the manufacture of new lamps with
rigidly fixed collars, but also to any existing lamps without requiring any change
in their present construction.
The said valve is formed of a single piece of sheet metal, soldered, brazed, or
pinned by one end to the lamp collar, and either lying flat upon its surface, or,
preferably, placed in a countersunk recess of suitable shape and depth to receive it,
so that the surface of the valve shall be flush with the surface of the collar, and
present no projection to render it liable to ininry

page_text: tapped, so that it may be screwed by its lower opening upon the fixed contar of the
lamp, and may receive the burner on its upper opening.
The office of the valve is to provide a safe escape for the explosive gases from the
oil chamber of the lamp, or the gas chamber formed by the collar c.
In Figures 4 to 7 of the Drawing I have illustrated various modifications in the
details of the Invention, which I will now describe.
Figure 4 is a central vertical section of an improved lamp collar, applied directly
to the body of the lamp, which is shown by dotted lines.
Figure 5 is a similar section of a supplemental collar, screwed on the top of the
ordinary fixed collar of a lamp.
Figure 6 is a horizontal section on an enlarged scale of the said improved collar,
on the line x, x, Figure 4.
Figure 7 shows an improved valve applied to the feeder of a lamp according to
this part of the said Invention.
Cis the safety collar, which in Figure 4 is represented as fixed to the body of
the lamp L; W is the valve seat, which is struck up in a die, and has, preferably,
the conoidal shape shown; V is the valve, struck from a die of corresponding shape
and size to that used for producing the seat, so that the under side of the valve
The valve is
shall exactly receive and cover the conoidal projection of the seat.
attached to the guide G, which works through one or more supporting bars, and is
attached at its inuer end to a bow spring S, the reaction of which tends to draw
the valve into contact with its seat.
In Figure 5 is represented a modification of the arrangement shown in Figure 4,
the fixed collar D having the usual construction, and the supplemental collar B pro-
vided with my improvements, being screwed on it, as clearly represented in the
said Figure.
Figure 7 illustrates the application of the improved valve to a lamp feeder,
attached to the body of a lamp L in the usual way. In this arrangement the guide
rod G is surrounded by a spiral spring which reacts against a plate on the guide G
to keep the valve down to its seat. The collar in this case is tapped, and the valve
seat screw threaded, so that it can be unscrewed when the feeder is to be opened for
the reception of oil. A bow spring would in this case be inconvenient, and I there-
fore replace it by a spring of more convenient form, as described.
Having thus fully described the said Invention, as communicated to me by my
foreign correspondent, and the manner of performing the same, I wish it under-
stood that I claim,—
First. The combination with the fixed or detachable collar of a lamp of the valve
made of a single piece of elastic sheet metal, attached by one end to the collar, and
covering a vent hole with the other, the said valve either lying flat upon the surface
of the collar or placed in a countersunk recess, as above set forth, and for the
purpose specified.
Second. A detachable lamp collar, made to screw on the fixed collar of a lamp
and to receive the burner, and provided with a vent hole and valve, constructed
and operating as above set forth, and for the purpose specified.
Third. The combination with the fixed or supplemental collar of a lamp of a
valve and valve seat, struck up in corresponding dies, and provided with the guide
and spring, all constructed, arranged, and operating as above set forth.
Fourth. The combination of the aforesaid improved valve with the cap or
covering of a lamp, oil feeder, or filler, thereby making the lamp non-explosive
without interfering with the ordinary fixed lamp collar, as above set forth.
In witness whereof, I, the said William Robert Lake, have hereunto set my
hand and seal, this Twentieth day of November, in the year of our Lord
One thousand eight hundred and seventy-seven.
W. KOB. LAKE.
(L.S.)