Improvements in the Construction of Lamp Chimney Frames and the like.
Year: 1897

page_text: Date of Application, 14th Sept., 1897
Complete Specification Left, 11th June, 1898-Accepted, 27th Aug.,
1898
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Lamp Chimney Frames and
the like.
I, THOMAS REDMAN, of The Priory, Bolton, Bradford, in the County of Yorkshire,
Gas Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to the construction of the frames of lamp chimneys, in
which mica or other transparent material is placed, and has for its object, the con-
struction of the frames in a simpler and less costly manner than is now the
common practice and without detriment to the utility of the chimney for supporting
and retaining in the necessary positions the transparent sheets in the complete
chimney.
In lamp chimneys as at present constructed, the metal frames are built up of
several pieces or sections, each section receiving the necessary shape or configura-
tion and when the several sections or pieces are fitted together, they are held by
means of rivets metal bindings, friction or by indentations.
In constructing my improved frame, I form the same from a sheet of metal by
cutting out the parts required and pressing the remaining portion of the cut or
perforated sheet, to the necessary configuration for forming the upright ribs or
columns with suitable ribs or flanges, and the edges forming the top and bottom
rings when the cutting is bent into circular form.
When the pressed sheet is bent into circular form, the ends of the same are
attached together by a wire, the bottom and top rims or rings and the upright
ribs or columns being so arranged that, mica or other transparent material may
be readily inserted or removed therefrom, and when inserted the said rims and
upright ribs retain the same in position.
My improved frame may be constructed in sections, by punching and pressing
each section so that the same is flanged and thereby strengthened at the upright
end ribs, which are so formed that on placing the sections together they may be
coupled by the insertion of a wire, or the uprights may be bent so as to form a
tee joint, the sections being secured together by placing one within the other, and
bending the same in the direction that the two are locked together the entire
length, or they may be cut and bent alternate ways.
Dated this 13th day of September 1897.
Improvements in the Construction of Lamp Chimney Frames and
the like.
I, THOMAS REDMAN, of The Priory, Bolton, Bradford, in the County of York,
Gas Engineer, do hereby declare the nature of this invention and in what manner
D
017

page_text: the same is to be performed, to be particularly described and ascertained in and by
the following statement:
-
This invention relates to the construction of the frames of lamp chimneys in a
manner for supporting the mica or other suitable material forming the trans-
parent portion of the lamp chimney, by a novel combination of parts so arranged
that, the rivets and binders as hitherto formed are dispensed with, and in lieu
thereof to so arrange the frame, that any section of the transparent material may
be readily placed in the lamp chimney or removed therefrom for cleaning or other
purposes, and to so form the framework that it is more durable, not so liable to
become distorted by the heat from the gas or other flame, and less costly to manu-
facture than is the case with chimney frames of the ordinary construction.
In lamp chimneys as at present constructed, the metal frames are built up of
several pieces or sections, each section receiving the necessary shape or configura-
tion and when the several sections or pieces are fitted together, they are held by
means of rivets, metal binders, friction or indentations.
In describing my invention in detail reference is made to the accompanying
sheet of drawings in which Fig. represents an elevation of a lamp chimney
frame formed according to my invention in which the several parts are integral
in each other.
Fig. 2 is an elevation of a slightly modified form of integral lamp chimney
frame.
Fig. 3 is a plan view of Figs. 1 and 2 looking down.
Fig. 4 is a bottom view of the same looking up, with part of the bottom flange
removed, and
Fig. 5 is a detail view illustrating a mode of connecting together the side edges
of cut out metal sheets for a lamp chimney frame.
In constructing open work lamp chimney frames in which the parts are formed
integral, I form the same from a sheet of metal by stamping or cutting out the
parts required to be open and pressing the remaining portions of the cut or per-
forated sheet metal to the necessary configuration for forming the bottom rim or
ring 1, the top ring 2 and the upright connecting ribs or columns 3 with suit-
able longitudinal flanges or beads 4 thereon at what is to be the inner side of the
frame.
When the pressed and cut out metal sheet is bent into circular or tubular form,
the side edges of the sheet are connected together in any suitable manner as by
means of a wire 5 passed into the tubular or semi-circular flanged portions of one of
the ribs or columns 3; a partly tubular portion of one of the said columns or up-
right ribs being formed on one edge of the metal sheet and another partly tubular
portion being formed on the other edge of the sheet, as shown by detached detail
Fig. 5, so that one will interlock with the other and be keyed together by a wire 5
as shown.
The bottom and top rings 1 and 2 and the connecting ribs or columns 3, with
the flanges 4 thereon, are so formed and arranged that plates or sheets 6, Fig. 3,
of mica or other transparent material may be readily inserted or removed, and
when inserted the rings and ribs will retain the transparent material in position,
between the flanges of adjacent ribs. These sheets of mica or other transparent
material may rest on indentations 7 formed in the base ring 1 for that purpose.
The lower ring is preferably formed with a base flange 8, a portion of which is
shown as broken away in Fig. 4, to expose the indentations or shoulders that are
to support the mica or the like.
By forming the upright connecting ribs or columns 3 with an external flange or
bead 4 a groove is formed between the flanges of the adjacent ribs for the reception
of sheets of mica or other transparent material, which when placed in the said
grooves between the said flanges will rest upon supports formed or placed on the
base ring 1 as before described.
The flanges 4 materially strengthen the respective ribs, so that they are not

page_text: 80 easily bent or distorted by the heat from the gas or other flame or by other
causes, and by forming the external flanges 4 in the manner described sheets of
mica or the like 6 can be inserted into the lamp chimney frame or be withdrawn
for cleaning, renewal or other purposes by sliding them within the lamp chimney
frame and between the flanges or the like without any alteration to the lamp
chimney frame.
If it is preferred to construct the lamp chimney frame in sections, these may be
formed by punching and pressing each section so that the same is flanged and
thereby strengthened at the uprights or ribs 4, which may be so formed as shown
at 4 Fig. 5, that on placing the sections together they may be coupled by the inser-
tion of a wire, or the ribs may be bent so as to form a tee joint, the sections of the
frame being secured together by placing one within the other and bending the ribs
or rib flanges in such direction that the parts to be connected will be locked together
the entire length of the frame, or the ribs may be cut and bent alternate ways to
form the required joint, in any case the internal ribs strengthen the lamp chimney
frame.
Having now particularly described and ascertained the nature of my invention
and in what manner the same may be performed, I declare that what I claim as
my invention is:.
1. A lamp chimney frame composed of a bottom ring and a top ring connected
together by ribs having flanges on their inner sides so arranged as to permit the
insertion and removal of transparent material and to hold the same in place when
inserted, substantially as described.
2. A lamp chimney frame composed of a bottom ring, a top ring and ribs con-
necting said rings, the bottom ring being provided with means for supporting
sheets of mica or other transparent material, and the said ribs being provided with
flanges for holding the mica or the like in place substantially as described.
3. A lamp chimney frame composed of a bottom ring and a top ring connected
together by upright bars or columns and provided with means for supporting and
retaining removably inserted sheets of mica or other transparent material, sub-
stantially as described.
4. A lamp chimney frame composed of a bottom ring and a top ring connected
together by upright bars or columns and the joint or joints made substantially as
described.