Improvements in the Construction of Furnaces for File Hardening and other like purposes.
Year: 1897

page_text: Date of Application, 29th Sept.,
1002
1001
Complete Specification Left. 28th June, 1893-Accented 20th Aug. 1898
Complete Specification Left. 28th June, 1898-Accented 20th Aug. 1898
Improvements in the Construction of Furnaces for File Hardening
and other like purposes.
I, JOHN SAYNOR, the Younger, 118, Westbury Street, Attercliffe, City of
Sheffield, File Hardener, do hereby declare the nature of my invention to be as
follows:-
My invention relates to the construction of furnaces, and more particularly to
furnaces used in the process of hardening files, but which may also be of use in
heating other like articles.
The object is to construct a furnace which will be well adapted for heating the
files with equality, and to prevent burning the points and having other advantages.
I build the furnace with an ashes place below a set of fire bars, upon which I
place the fire, and above the fire I provide an opening closed by a door, I also
provide a door for the ashes place.
Opposite the upper door, at the back of the furnace I construct a shelf of brick-
work, its front edge tapering from the top backwards, and in each side of the
furnace I make a groove level or thereabouts with the top of the said
shelf, to support the ends of two or more adjustable cross-bars upon which the
files or other articles are laid, and so that their points may rest upon the before
mentioned brick shelf when desired.
The furnace proper is roofed in with the exception of a flue opening at the front
end or just over the doorway, which communicates with a horizontal flue carried
back over the furnace roof to the chimney or other exit.
In some position below the fire bars, I have an opening into the ash pit for
inserting a blast pipe for use when required to accelerate the draught and increase
the action of the fire.
"
The files are supported upon the movable bars which are adjusted to suit the
length of the files, and in pointed files, the points are laid upon the brick bridge
to prevent them becoming overheated.
1
1
Improvements in the Construction of Furnaces for File Hardening
and other like purposes.
I, JOHN SAYNOR, the Younger, 118, Westbury Street, Attercliffe, City of
Sheffield, File Hardener, do hereby declare the nature of this invention, and in
what manner the same has to be performed, to be particularly described and ascer-
tained in and by the following statement:
-
My invention relates to the construction of furnaces, and more particularly to

page_text: furnaces' used in the process of hardening files, but which may also be used for
heating other like articles.
The object of the invention is to construct a furnace which will be well adapted for
heating the whole of the file with regularity and to avoid the risk of burning the
points or thin ends, and thus to prevent deterioration of the steel at those parts.
Such a furnace is illustrated in the sheets of drawings annexed, in which:
Fig. 1, is a front elevation of such furnace.
Fig. 2, section of same, through line 1, 2.
Fig. 3, vertical section through the centre, 3, 4.
Fig. 4, vertical section through line 5, 6.
'
In carrying out my invention as illustrated in the drawings, I build a furnace,
having preferably a metal front plate A; provided with a soot door B, furnace
door C, and ash place door D, as seen in Fig. 1, and a damper E, seen in Fig. 3.
The door D, is to close the ashes place F, below the fire bars G, upon which 'the
fire is made as shown.
J
The door C, is to close the opening through which the files or other articles to
be heated, are placed in the furnace.,
Opposite the door C, and at the back of the furnace, PI construct a shelf or
projection H, preferably made to extend from one side to the other, it may be. cut
out of the brickwork, or be formed of a single firebrick of the configuration shown
in Fig. 3, and in each side of the furnace I construct a groove I extending from
the front, back to the shelf H, or thereabouts.
I place upon the floor of these grooves, the ends of two or more bars J, which
may be adjusted to any desired distance apart to suit the length of the files or
other articles, and it is better that the top side of these bars should be on the
same line as the face of the shelf H.
In the roof N of the furnace P and close to the front end I make. an opening K,
leading into the horizontal flue L, and to the chimney M, across which is the regu-
lating damper E.
The soot door, B, is to enable the soot and dust, to be cleared out of the .hori-
zontal flue L.
The files or other articles, O, are placed upon the bars J,. to become heated, and
the points or reduced ends may rest upon the shelf H, so as to take them out of
the direct action of the fire, and prevent them becoming overheated.
I may use a blast pipe for accumulating the draught, the nozzle of which would
be situated somewhere below the fire bars G, but this forms no part of my
invention.
Having now particularly described and ascertained the nature of my inven-
tion, and in what manner the same is to be performed, I'declare that what I
claim is:-
1-In a furnace for heating files and other like articles, a shelf or projection
(such as H) at the end opposite the furnace door upon which the points or reduced
ends of the articles can rest and be protected from the direct action of the fire,
substantially as hereinbefore described and set forth.
2-In a file furnace the combination of the shelf H, the grooves I, and adjust-
able bars J, upon which the files are placed, constructed and arranged as herein-
before described.
3-A file furnace constructed substantially as herein before described and shown
in the drawings hereto annexed.
Dated the 24th day of June 1898
ROBT. F. DRURY, C.P.A.,
Agent for Applicant, Bank Buildings, George Street, Sheffield.