Year: 1887

page_text: I HEINRICH GRIEGER of 56 Blumen Strasse Berlin in the Empire of Germany do
hereby declare the nature of this invention to be particularly described and ascertained
in and by the following statement:—
This invention relates to that class of oil lamp in which the oil burns in the interior
of the annulus formed by the wick and burner, giving a ring flame.
The object of my invention is to provide an oil-tight joint between the oil reservoir
and the burner so that the oil cannot escape even when the lamp is upset.
This I attain by means of the mechanism shewn in the accompanying sheet of
drawings in which Fig. 1 is a longitudinal of the improved lamp reservoir and burner
constructed according to my invention. Fig. 2 is sectional elevation of adjusting
mechanism. Fig. 3 is plan of same and Fig. 4 plan of plug or stopper for closing
reservoir. The same letters refer to the same parts in all the figures. a is a central
tube rigidly connected with the oil reservoir, air being admitted to same by means of
slots c.
d is the wick which is pressed against the outer tube e by means of springs h
so as to move with it, said tube has at its extremity an internal flange ƒ said flange
being bored to accurately fit the tube a.
By means of the mechanism hereinafter described the tube e is capable of being
moved up and down with reference to the tube a thereby regulating the height of the
burning portion of the wick shewn at 9 when the tube e is lowered to its fullest
extent the flange of fits over the end of the tube a and thus extinguishes the flame.
The mechanism for raising and lowering the tube e consists of the tube i which
carries at its extremities screw threads one of which k serves to screw the burner into
the reservoir while the other supports the gallery. The tube e is capable of moving
up and down in the tube i and has attached to it two pins n taking into diametrically
opposite slots m in the tube i. Over this tube i is placed another short tube o fitted
with an adjusting disc o¹ the whole being capable of a motion of rotation on the
tube i; longitudinal motion being prevented by means of the cap q and washer p,
this tube is also provided with two diametrically opposite slots also engaging with
the pins n; the slots being oblique, on rotating the disc o¹ in one or other direction
the position of the of the pins n in the said slot is altered and the tube e being moved
up and down by the said pins the light is thus regulated or extinguished. The tube i

page_text: is provided with a rims made of thin metal which bears against the tube e forming a
tight joint between the tubes i and e preventing any leakage of oil should the lamp
be upset. To allow of the reservoir being filled and to provide for the egress of air
from the same when screwing in the burner, or to allow ingress of air as the oil is
consumed provide a screw cap t fitted with a valve v closed by means of a spring w
placed between the valve and the bridge piece x.
To allow any compressed air to escape from the reservoir, the valve v is opened by
pressing the stud y but should a vacuum be produced in the reservoir owing to
consumption of oil by the flame the valve v opens automatically and allows air to
enter. Lamps constructed on this principle may be burnt for some weeks without
cleaning.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
I. In the manufacture of oil lamps with annular burners the central tube a in
combination with a moveable tube e capable of motion in a longitudinal direction
substantially as set forth.
II. The mechanism for regulating the position of the tube e relative to the fixed
tube a consisting of the tubes i and o provided with slots m and engaging with the
pins n operated by rotating the adjusting disc o' substantially as set forth.
III. The means herein described for making a tight joint between the tubes i and e.
IV. The improvements in lamps constructed substantially as described with
reference to the accompanying sheet of drawings and operating as and for the purpose
specified.
Dated this Eighth day of October 1887.