Improvements in Lamp Chimneys, and in the Method of and Apparatus for Making the same.
Year: 1893

page_text: Date of Application, 31st Oct., 1893-Accepted, 9th Dec., 1893
Date of Application, 31st Oct., 1893-Accepted, 9th Dec., 1893
WAMPIR
NURY VAIMINMEN
Improvements in Lamp Chimneys, and in the Method of and
Apparatus for Making the same.
I, WALTER EUGENE MAYO, of Steubenville, in the County of Jefferson, and
State of Ohio, United States of America, Gentleman, 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 improvements in lamp chimneys, and also to a method for
conveniently practicing the improvements.
It is well known that by providing lamp chimneys at their bases with air inlets
numerous advantages arise, in that the air increases the brilliancy of the light,
overcomes to a great extent the liability of breaking, and also avoids the smoking
of the chimney, rendering the lamp as a whole improved and safer.
The objects of my invention are to provide lamp chimneys having an improved
form of opening or air-inlet, whereby the said chimneys are strengthened at such
points; and finally to produce a simple method of forming these openings of the
character described.
My invention consists, therefore, first in a lamp chimney having an opening or
air-inlet, the stock of the chimney having been crowded laterally or upset to form
the opening and thereby producing at the edge of each opening a thickened
strengthening rib or flange; and, secondly, in the means or method for producing
this opening or inlet, the same consisting in fusing the chimney at the points at
which it is desired to form the openings and crowding or upsetting the stock away
from said fused points.
Referring to the drawings:
Fig. 1 is a plan view of an apparatus adapted to practice my method.
Fig. 2 is a vertical sectional view of the same.
Fig. 3 is a perspective view of the lower end or base of a lamp-chimney.
Fig. 4 is a vertical longitudinal sectional view through the same and through one
of the air-openings or inlets.
Like numerals of reference indicate like parts in all the figures of the drawing.
The chimney 1, is of the ordinary construction, with the exception that at its
lower edge or base it is provided with a series, consisting of any desired number of
indentations, notches, openings or inlets 2, each of which has its edge provided with
a thickened strengthening-rib or flange 3, whereby the tendency upon the part of
the lamp to fracture at these points is overcome or resisted.
Referring to Figs. 1 and 2, wherein I have illustrated one simple form of
machine for practicing my method, 4 designates a suitable bench or supporting-
table, on which I arrange at its center a metal disk or anvil 5, having a concentric
hub or core 6, located upon its upper side and of a diameter slightly less than that
of the lamp-chimney 1.
Radiating from this hub or core 6 and arranged upon the upper side of the anvil
or disk 5 is a series of superficial ribs 7, which in cross section approximate the
shape which it is desired the openings 2 shall be.
In the same radial plane as the ribs 7 I arrange a series of gas-burners or
blow-pipes 8, the same having their inner ends provided with the flame-perfora-
tions. Each of the burners or blow-pipes 8 is connected with suitable air and gas-
supply pipes 9 and 10 respectively which it will be understood lead from suitable
sources of supply not shown.
If preferred the burners or blow-pipes 8 may be vertically adjustable relative to
the base 4 and anvil 5, and as a neans for providing for such adjustment I may
provide each of the pipes 9 and 10 with set-nuts 11 arranged above and below the
openings in the table 4 through which said pipes pass.

page_text: To such details, however, I do not limit my invention, and would therefore
state that I may vary the same to any degree and extent within the knowledge
of the skilled mechanic without departing from the spirit or sacrificing any of
the advantages.
In practicing my invention the chimney to be operated upon is introduced over
the hub or core 6 and the gas jets ignited, the flame being discharged against the
chimney at the points above the ribs where the openings or inlets are to be formed.
This causes the glass to become plastic or fused, and when this stage has been
reached, the operator presses the chimney gently down upon the ribs, the latter
serving to crowd the stock lengthwise or upset it so that the openings or inlets are
formed as are also the strengthening ribs or flanges, the latter being produced by
the stock that is forced away from the openings or inlets. The chimney having
been operated upon in the manner specified, that is withdrawn from over the core,
is placed in a cooling oven where it is gradually cooled.
From the foregoing description in connection with the accompanying drawing, it
will be seen that have provided a very simple apparatus for the practice of my
method, and that as a result of such method I produce a new and improved article
of manufacture.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. The hereindescribed improved lamp-chimney, the same having its lower end
at intervals provided with air-inlets, the stock at the edges of which is provided
with strengthening thickened ribs, substantially as specified.
2. The method of producing air-inlets in lamp-chimneys, the same consisting
in heating the chimney to a fusing point at the point at which the opening is
desired, and crowding the stock away from said fused point whereby an opening
or inlet having an upset strengthening rib is produced therearound, substantially
as specified..
3. The hereindescribed method of notching glass chimneys consisting in
heating the edge thereof in spots to a fusing point and forcing it against ridges
on which the chimney is held, substantially as and for the purpose set forth.
4. The hereindescribed device for notching glass chimneys, consisting of an anvil
having a series of radial ribs, and a central core adapted to receive a chimney,
combined with blow-pipes or burners arranged outside of said anvil and radially
opposite the respective ribs for the purpose of heating the edge of the chimney in
spots while resting and forced against said ridges and onto the anvil, substantially
as and for the purpose set forth.
Dated this 30th day of October 1893.
W. P. THOMPSON & BOULT,
Agents for the Applicant.