Improvements in Extinguishers for Oil Lamps having Circular Wicks.
Year: 1887

page_text: TROYIDIONAL DIOTICATION.
Improvements in Extinguishers for Oil Lamps having Circular
Wicks.
1, FREDERICK WILLIAM DURHAM of No. 27 Leadenhall Street in the City of
London Engineer do hereby declare the nature of this invention to be as
follows:-
My invention relates to extinguishers for oil lamps having circular wicks, so
arranged that extinction can be effected by hand, or automatically when the lamp is
tilted or overset.
For this purpose, I arrange outside the wick tube two short tubes free to slide up
and down. The inner tube has hinged on it a number of segmental petals, which,
when the lamp is burning, stand up inclining somewhat inwards all round the base of
the flame. These petals have tails which rest on the top of the outer tube, which tube
can be raised by a lever handle. On raising it, and so raising the tails of the petals
and partly raising the tube to which they are hinged, they are caused to fold inwards
over the wick and so extinguish the flame. In order to effect automatic extinction,
I place under the outer tube a spring which nearly balances the weight. When the
lamp is tilted or overset, the effect of gravity being lessened while the spring retains
its lifting power,
the outer tube is raised by it and the lamp is extinguished. The
lamp may have a central deflecting button so arranged that when the petals are folded
inwards it completes the closure over the wick.
Dated this 2nd day of November 1887.

page_text: COMPLETE SPECIFICATION.
Improvements in Extinguishers for Oil Lamps having Circular
Wicks.
1, FREDERICK WILLIAM DURHAM, of 27 Leadenhall Street, in the City of
London, 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 invention relates to extinguishers for oil lamps having circular wicks, so arranged
that extinction can be effected by hand, or automatically, when the lamp is tilted or
overset, as I will describe referring to the accompanying drawings which show so
much of a circular wick lamp as is necessary to illustrate my invention. Fig. 1 is a
vertical section and Fig. 2 is a plan shewing the extinguisher open as when the lamp
is burning; Fig. 3 is a vertical section and Fig. 4 is a plan shewing tho extinguisher
closed.
Outside the wick tube I arrange two short tubes A and B each free to slide up and
down along guides a and b. To the inner tube B are hinged a number of segmental
petals, preferably in two scis, an outer set C and an inner set D.
When the lamp is burning these petals stand up inclining somewhat inwards all
round the base of the flame as shewn in Figs. 1 and 2. The outer petals Chave
tails E which rest on the top of the outer tube A. By means of a handle lever F
acting on pins a projecting from the tube A, this tube can be raised, thus raising the
tails of the petals and raising somewhat the tube B to which the petals are hinged.
The petals are thus caused to fold inwards over the wick as shown in Figs. 3 and 4,
extinguishing the flame. In order to effect automatic extinction 1 place under the
tube A a spring G of strength sufficient to support the weight of the tubes and
petals.
When the lamp is tilted or overset, the effect of gravity is lessened while the
spring retains its lifting power, raising the tube A and so extinguishing the flame.
Instead of placing a helical spring G under the tube A, a volute spring may be
arranged in a barrel H to act on the lever F. In cases where a deflecting button is
used as K Fig. 1, the petals may be shaped so that, instead of folding so far inwards
as shewn in Figs. 3 and 4, they fold against the deflector which with them effects
complete closure over the wick.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1. An extinguisher for a circular flame lamp, consisting of petals in combination
with two vertically sliding rings, arranged and operating substantially as described.
2. In combination with an extinguisher of the kind referred to in the preceding
claim, a spring for effecting automatic extinction in the manner set forth.
Dated this 2nd day of August 1888.
ABEL & IMRAY,
Agents for the Applicant.