Improvements in Wick Raisers for Central Draft Lamps.
Year: 1893

page_text: Date of Application, 20th July, 1893-Accepted, 26th Aug., 1893
COMPLETE SPECIFICATION.
[Communicated from abroad by THE EDWARD MILLER AND COMPANY, a
Company incorporated and located and doing business in Meriden, County of
New Haven, State of Connecticut, one of the United States of America.]
Improvements in Wick Raisers for Central Draft Lamps.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45 Southampton Buildings, in the County of Middlesex, 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 wick raisers for central draft lamps and is illustrated in
the accompanying drawings in which
Figure 1, represents a view, partly in side elevation and partly in vertical section,
of a lamp constructed in accordance with this invention.
Figure 2, a detached view in side elevation of the wick-band and adjusting-bar.
Figure 3, a detached sectional view of the long screw-threaded sleeve, to the
lower end whereof the operating-nut is attached.
This invention relates to an improvement in wick-adjusters for central-draft
lamps, the object being to produce a simple, durable, effective and convenient
device, adapted for direct manual operation through its upper end or operation
by a nut through its lower end as found most convenient.
With these ends in view the invention consists in a wick-adjuster having certain
details of construction and combinations of parts, as will be hereinafter described,
and pointed out in the claims.
The fount A, and central draft-tube B, of the lamp, are of ordinary construction,
except that the former has mounted in it at a point to one side of the said tube
a vertical bearing-tube C, which passes through the oil-chamber and projects a
very little out of the fount at its upper and lower ends, at which points it is
soldered or otherwise sealed, so as to prevent any escape of oil from the fount.
A long internally-threaded sleeve D, is located within the said bearing-tube,
extending nearly to the upper end thereof and constructed at its lower end with
a neck D', which passes through the contracted lower end of the tube and
receives the centrally-perforated operating-nut E, which is rigidly secured to the
said neck. A shoulder d, formed between the lower end of the said sleeve D
and its neck D', rests upon the contracted lower end of the bearing-tube and
prevents the downward movement of the sleeve, while the inner end of the
nut engages with the extremic end of the bearing-tube and prevents
the upward movement of the sleeve, whereby the same is held against
longitudinal movement in either direction, but is free to rotate. The wick band F,
encircling the draft-tube B, is of ordinary construction, and has connected with
it the bent lower end of the short leg G of the bowed adjusting-bar, the said
leg playing up and down through an open slot H, extending outwardly from
the inner edge of the top of the lamp-fount. The long leg G' of the said
adjusting-bar, which is preferably formed from a heavy rod or wire, is straight
and extends down through the threaded sleeve D, before mentioned, through
the centrally-perforated operating-nut E, attached to the lower end thereof, and
projects below the said nut, its projecting lower end being threaded to receive
the retaining-button I, which has the two-fold function of preventing the said
leg of the bar from being drawn out of the bearing-tube and threaded sleeve,
and of affording a means for raising and lowering the bar by direct or plunging
action through the lower end of its said leg. The long vertical loop formed by
the upper portions of the said legs of the bowed adjusting-bar, forms a handle
for grasping the same for direct manual operation from the top of the lamp-

page_text: fount. The said long leg G¹ of the bar is provided about midway of its length
and, as herein shown, slightly above its longitudinal center with a double spiral
thread J, the same being formed upon the surface of a short sleeve J¹, fixed
upon the bar.
As herein shown, the said double screw-thread contains about
two turns and is of very coarse pitch, in which it corresponds to the pitch of
the thread D2 of the sleeve D, the said thread D2 consisting, as herein shown,
of a rectangular wire formed into a coarse spiral, and secured to the inner face
of the sleeve, which may, however, if desired, have the thread formed in it by
an obvious process analogous to beading; but however the threads of the bar
and sleeve are formed it is designed that they shall be so coarse in pitch as to
permit the bar to be raised and lowered by taking hold of the long loop at its
upper end and by taking hold of the knob I, attached to its lower end. In
such operation of the bar the sleeve and its nut would be rotated in one direction
or the other, according to the way in which the bar was moved, the friction of
the described rotation of the sleeve being reduced to the minimum by contracting
its lower end to form the neck D' and shoulder d, the latter resting upon the
contracted lower end of the bearing-tube C. The object of making the threads
very coarse is of course to reduce the friction of their operation and permit the bar
to be plunged, so to speak, up and down.
The invention is not limited to the use of the double threads J on the bar; but
threads so constructed reduce the wear and friction of operation greatly.
To operate the bar from its lower end by the nut E, the same is grasped between
the fingers and turned, whereby the bar is operated directly through the sleeve.
To remove the bar, the retaining-button is taken off, after which the bar and
wick-band may be drawn out of the lamp integral or without dismemberment, the
sleeve and nut remaining in their normal positions.
It is to be understood that the invention is not limited to the exact construction
herein shown and described, but comprehends such changes and alterations as may
fairly fall within the spirit and scope thereof.
It is known that it is old to provide a lamp-fount at a point to one side of its
center with a vertical bearing-tube to contain an internally threaded rotable but
longitudinally immovable sleeve receiving the long leg of a wick-adjuster and
furnished at its lower end with a nut by which it is rotated to move the said
wick-adjuster up and down by screw action, and that construction is therefore not
claimed broadly.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed as communicated to me by
my foreign correspondents I declare that what I claim is :
In a central-draft lamp, the combination, with the fount and draft-tube thereot,
of a bearing-tube mounted in the fount to one side of the said draft-tube and
projecting at its upper and lower ends through the fount, a long rotable sleeve
having an internal thread located within the said tube, in which it is held against
longitudinal movement, a centrally-perforated operating-nut rigidly connected with
the lower end of the sleeve, a wick-band encircling the draft-tube, an adjusting-bar
having its short leg attached to the said band and its long leg passed downward
through the said sleeve, through the centrally-perforated nut connected with the
lower end thereof, and provided with a thread taking into the internal thread of
the sleeve, and a removable retaining-button attached to the projecting lower end
of the long leg of the said bar, the threads of the sleeve and bar being constructed
in pitch so as to permit the bar to be vertically reciprocated manually by direct or
plunging movement from its upper and its lower end, substantially as set forth.
Dated this 20th day of July 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.