Year: 1886

page_text: I ALFRED JULIUS BOULT of 323 High Holborn, in the County of Middlesex,
Engineer, do hereby declare the nature of this invention (a communication from
Carl Rakenius and Company of Berlin, in the German Empire) 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 improvements in lamps and consists essentially in a
novel arrangement for turning the wick up or down, which is done by giving the
wick tube the requisite movement by a pitch chain and the necessary pitch wheels.
In the accompanying drawings
Figure 1 represents a vertical section.
Figure 2 a horizontal section on line x x of Figure 1.
Figure 3 a side elevation without wick.
Figure 4 a vertical section of the chain casing without the chain.
Figures 5 and 5* elevation and plan of the improved wick tube.
The invention is here applied to a lamp the inner tube of which extends through
the reservoir to get the inner draught from below the reservoir.
The wick tube A, on which the wick is held by the wires a with a hook b at the
upper end, fastened to A by their lower ends see Figures 1 and 2, or by the
catches 6 fastened to A. see Figure 5, is placed round the inner tube B and is
provided at the lower end with a lug D Figure 5.
To the outer wick tube C is fastened the vertical chain casing E which contains
the pitch wheels and the pitch chain. In the upper end of the casing E is
journalled the spindle S with the pitch wheel k and in the lower end of E the
pin s with the pitch wheels k¹ and k³. The endless pitch chain K is placed round
the pitch wheels k k¹ k².
The lug D on the inner wick tube A passes through a slot c in the outer wick
tube C and a slot e in the chain casing E, which slots also serve as guides for D,
and catches in one of the links of the pitch chain K. When the spindle S is
turned by its button & the inner wick tube A will be moved up or down with the
wick held thereon by the lug D engaging with the pitch chain K and in this
manner a sure, even and steady movement of the wick is obtained.

page_text: Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed as communicated to
me by my foreign correspondent I declare that what I claim is
1. The method of raising or lowering the wick of a lamp by means of a pitch
chain.
2. In lamps the arrangement for moving the wick up or down by the com-
bination of a pitch chain, pitch wheels and a lug fastened to the wick tube and
engaging in a link of the pitch chain substantially as specified.
3. In lamps an arrangement for the movement of the wick consisting in a pitch
chain K, arranged in a casing E around the pitch wheels k, l, k turned by the
spindle S, and a lug D fastened to the inner wick tube A and engaging in one of
the links of the pitch chain which moves this lug up or down in the slots o
and e of the outer wick tube C and the chain casing E which serve as guides,
substantially as and for the purpose specified.
4. In lamps the catches bib fastened to the inner wick tube A for the purpose
of holding the wick on to the tube A substantially as specified.
Dated this 3rd day of May 1886,
W. P. THOMPSON & BOULT,
Agents.