Improvements in Lamps for Burning Mineral Oils.
Year: 1886

page_text: Date of Application, 30th Aug., 1886.
Complete Left, 9th May, 1887
Complete Accepted, 10th June, 1887.
Improvements in Lamps for Burning Mineral Oils.
I, EDOUARD DE RAET of Molenbeck St. Jean Brussels in the Kingdom of Belgium
do hereby declare the nature of this invention to be as follows:-
This invention relates to a simple construction of Argand lamp suitable for burning
mineral oils, one chief object of the invention being to admit of employing a plain
cylindrical glass chimney without preventing the use of chimneys of other forms.
The gallery which supports the chimney consists of an outer casing perforated with
numerous holes for admission of air, and an inner central tube which fits on the wick
tube. The gallery is secured on the reservoir of the lamp not by screwing as is usual,
but by two bayonet catches which are kept engaged by a light wire spring. On the
internal wick tube fits a ring that can be slid up or down by a rack and pinion. This
ring is made with two projecting lips that are serrated to engage the wick which is
placed on the ring and held thereon by an outer spring binding ring. On the gallery,
within the base of the glass chimney is placed a conoidal capsule with lip turned
inwards at its upper mouth so as to direct the air against the exterior of the flame;
and in the centre, just above the mouth of the capsule is fixed an internal button
which deflects the air against the interior of the flame. This button consists of a
lower ring and above it an inverted cup, there being left, between the ring and the
lip of the cup a narrow slit all round for the passage of air-radially from the cavity of
the cup towards the interior of the flanic.
ABEL & IMRAY,
28, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Lamps for Burning Mineral Oils.
I, EDOUARD DE RAET of Molenbeck St. Jean Brussels in the Kingdom of Belgium
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:-
This invention relates to an improved construction of Argand Lamp suitable
for burning mineral oils, whereby the construction is generally simplified, and ordinary
cylindrical glasses are capable of being used in place of the special forms of glasses
now used for these lamps, while at the same time the connection of the gallery and
burner hood to the lamp is effected without screwing as at present.
The improved construction will be readily understood on reference to the accom-
panying drawings in which Fig. 1 shews a vertical section of the lamp Fig. 2 is a
plan Figs. 3 and 4 section and plan of the gallery and top of burner to an enlarged
scale, Figs. 5 and 6 section and plan of the hood Figs. 7 8 and 9, elevations and plan
of the wick holder. Figs. 10 and 11 elevation and plan of the wick clamping ring,
and Figs. 12 and 13 elevation and plan of the air deflecting button.
In lamps of this description with central air deflecting button as heretofore
constructed the use of bulged lamp glasses has been necessary because the button has
the effect of spreading out the flame, the button being necessary for producing the
requisite surface of flame and efficiency of combustion.
By the use of the improved construction of button shewn at Figs. 12 and 13 the
flame rises in approximately cylindrical form, and consequently permits of the use of
a cylindrical glass, such glasses having the advantage of greater cheapness and more
convenient manipulation than the bulged glasses. The button is for this purpose
formed of two parts, the upper part K being in the form of a dished cap, which
is fixed on the upper end of a rod K², while the lower part K' is formed as a ring,
attached by three arms to the rod K2 in such a position as to leave a small annular
space between it and the edge of the part K. The rod K2 is bored at its lower
end and fits upon the rod S which is fixed to the central tube R of the lamp.
By causing the air rising through the central tube to issue through the narrow
annular space between K and K the flame of the burner will be led up in a
straight direction in cylindrical form round the button, instead of being spread or
bulged out as is usually the case, and consequently cylindrical glasses can be used.
The gallery B with the outer wick tube and hood is attached to the neck of the
lamp in the following manner. To the lower end of the gallery are attached two
diametrically opposite hooks bas also a curved spring acting downwards and
laving its end projecting beyond the gallery. To the top of the oil reservoir
is fixed ring o having diametrically opposite slots. For fixing the gallery upon the
lamp its hooks are introduced into the slots of the ringo and the gallery is turned
round to the right until the hooks pass under the ring, whereupon the spring springs
into a notch of the neck o' of the lamp into which the bottom part 3 of the gallery

page_text: fits. For removing the gallery the spring is raised out of the notch by the projecting
end and the gallery is turned back again until the hooks can be drawn out of the
slots of o. The method of fixing the gallery is very simple and effective and more
practical than the screwing arrangement.
The hood V Figs. 5 and 6 fits with its lower end on to the annular seat 4 of the
gallery, where it is enclosed as usual by the lamp glass. The wick is actuated by
means of a rack rod Z passing through a guide F in the oil reservoir; it is formed
with an elbow at its lower end, having two flanges 11 by which it is fixed to the ring E
having a serrated flange at each end. The lower end of the wick is passed over the
ring the serration of which penetrate into it, after which the corrugated clamping
ring D is placed over the wick so as to clamp it against the ring E, the clamp D being
formed with a space for the arm of the rock rod to pass, and the two ends being held
together by a bridge piece G. The corrugated form of the clamp allows of the
free passage of the oil to the wick.
The wick with the clamping rings and rack rod, is placed over the central tube R
of the lamp before the gallery is fitted on, the rack being slid through the guide F in
gear with the pinion actuated by the button W so that by turning this the rings
together with the wick are raised or lowered.
Having now particularly described and ascertained the nature of this invention and
in what manner the same is to be performed I declare that what I claim is :-
1. The use in oil lamps with central air tube of an air deflecting button such as
herein described with reference to Figs. 12 and 13 of the drawings wherein the air
supply is caused to issue through a narrow annular space formed between the parts K
and K¹.
2. The herein described arrangement for securing the gallery and hood on the lamp
wherein hooks or catches such as b fixed to the gallery are passed through slots in the
neck of the lamp and after being turned partly round with the gallery, are held in
position by a spring catch such as b¹.
3. The herein described arrangement for actuating the wick, wherein the wick is
fitted upon a serrated ring such as E that is moved up and down upon the central
air tube by a rack rod, the wick being held on the ring by a corrugated clamping ring
such as D.
Dated this 9th day of May 1887
ABEL & IMRAY,
Agents for the Applicant.