IMPROVEMENTS IN THE CONSTRUCTION OF TRAVELLING OVENS
Year: 1866

page_text: LETTERS PATENT to George Haseltine, of the "International Patent
Office," No. 8, Southampton Buildings, Chancery Lane, in the County
of Middlesex, Civil Engineer, for the Invention of "IMPROVEMENTS IN
THE CONSTRUCTION OF TRAVELLING OVENS."-A communication from
abroad by William Hinchliffe, of Melbourne, in the Colony of Victoria,
Australia.
Sealed the 9th April 1867, and dated the 23rd October 1866.
PROVISIONAL SPECIFICATION left by the said George Haseltine at the
Office of the Commissioners of Patents, with his Petition, on the
23rd October 1866.
I, GEORGE HASELTINE, of the "International Patent Office," No. 8,
Southampton Buildings, Chancery Lane, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN THE CONSTRUCTION OF TRAVELLING OVENS," a communication, to be as
follows:-
The said Invention relates to the construction of travelling ovens, and is
designed to render the same more economical and convenient than those at
present in use.
An oven is built of a circular form about twenty feet in diameter between
the walls of the inner sides of the circle, the oven itself being about three

page_text: feet wide and about one foot high to the crown of the arch, which is built of
brick or any other suitable material. This oven is heated by means of a flue
underneath the whole width of the oven, and is about eighteen inches high.
The floor or track of the oven is of cast iron, and has V-shaped grooves cast
in it, in which are placed balls turned truly globular. The top groove serves
as a guide to the said balls and is fixed by screws or otherwise on the travelling
bed. Over this the travelling plate is placed, which is also made of cast iron,
and upon this travelling plate I place bricks or tiles on which the biscuits are
placed for baking. At one portion of the circular oven an opening is formed
for the purpose of feeding and discharging, and this is the only portion of the
said oven which need be under cover. The oven having been sufficiently
heated, and the material to be treated placed upon the bricks or tiles on the
travelling plate motion is communicated to the latter by means of cog wheels
working on the outside of the oven. The said plate moves along over the
balls until it has made a complete circle, and has arrived at the feed opening,
where it discharges itself into a proper receiver by means of a plate placed
conveniently for the purpose. The travelling plate having thus, discharged
itself is again immediately re-fed, the motion continues, and the same opera-
tion can be repeated ad infinitum. The speed with which the travelling plates
are caused to revolve will vary according to the heat of the oven and the
nature of the article to be treated.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said George Haseltine in the Great Seal Patent Office on the
23rd April 1867.
"TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE.
HASELTINE, of the "International Patent Office," No. 8, Southampton
Buildings, Chancery Lane, in the County of Middlesex, Civil Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-third day of October, in the year of our Lord
One thousand eight hundred and sixty-six, in the thirtieth year of Her reign
did, for Herself, Her heirs and successors, give and grant unto me, the said
George Haseltine, Her special licence that I, the said George Haseltine, my
executors, administrators, and assigns, or such others as I, the said George
Haseltine, my executors, administrators, and assigns, should at any time agree
with, and no others, from time to time and at all times thereafter during the

page_text: term herein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN THE CONSTRUC-
TION OF TRAVELLING OVENS," upon the condition (amongst others) that I, the
said George Haseltine, my executors or administrators, by an instrument in
writing under my, or their, or one of their hands and seals, should par-
ticularly describe and ascertain the nature of the said Invention, and in
what manner the same was to be performed, and cause the same to be
filed in the Great Seal Patent Office within six calendar months next and
immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said George Haseltine, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement, and accompanying Drawings:-
:
The said Invention relates to the construction of travelling ovens, and is
designed to render the same more economical than those at present in use.
An oven is built in a circular or annular form, and of any convenient size.
The travelling plate travels on balls, by preference made hollow and of cast
iron; the said travelling plate is also made of cast iron, and upon this plate I
place bricks or tiles on which the biscuts are placed for baking. The oven is
heated by a flue underneath and by pipes through it. At one. portion of
the annular oven. an opening is formed for the purpose of feeding and dis-
charging, and this is the only portion of the said oven which need be under
cover; this oven having been sufficiently heated, and the material to be treated
placed upon the bricks or tiles on the travelling plate, motion is communicated
to the latter by means of a cog wheel working on the outer edge of the
travelling plate; the said plate moves along over the balls until it has made
a' complete circle and has arrived at the feed opening, where it discharges
itself into a proper receiver by means of a plate placed conveniently for the
purpose. The travelling plate having thus discharged itself is again im-
mediately re-fed, the motion continues, and the same operation can be repeated
ad infinitum. The speed with which the travelling plate is caused to revolve
will
I vary according to the heat of the oven and the nature of the article to be

page_text: A is the furnace; B is the horizontal flue; C, the vertical flue;. D.is a
damper in the same; D is a handle for working the said damper; Eis a
horizontal flue; F, F, F, F, are; iron pipes; G. is a damper in. the iron
pipe F G is a handle for working the damper G; H is a vertical flue;
I; a space filled with sand; J is the travelling plate or bed covered with
tiles; K is a space filled with sand; L is the base of the horizontal flue; M
are the tiles; N is a guide; P are cast-iron balls; O are iron bed plates,
upon which the said balls travel; Q is a guide for the balls P; R are sand
baths; S are iron flanges dipping in the said baths; the flange on the inner
side of the oven extends above the surface of the tiles M on the travelling
bed J, as shewn in Figure 2; T is a pinion gearing into the bevilled edge of
the travelling plate; U is the shaft of same; V is the oven; W are fire, tiles
forming the top of the said oven; X is a space filled with sand; Y is a
covering of fire tile or brick; Z is the feed opening, and A² the discharge.
opening; B is a plate fixed obliquely across the oven for discharging the
biscuits.
When about to use the oven I first light. a fire in the furnace, open, the
damper D, and close the damper G; the course of the heated air will then
be through the horizontal flue B, ascending vertical flue C, passing through
horizontal flue E, and pipes F, F, F, whence it is finally discharged into
the chimney. When the oven is sufficiently heated I place the dough to be
baked upon the tiles M, on the travelling plate J, and apply power to the
pinion T; consequently motion is communicated to the travelling bed and I
continue supplying the oven with material. The speed and the heat must be
so regulated that one rotation of the travelling bed J will be sufficient (and
only sufficient) to bake the material to the necessary degree, so that when it
arrives against the plate B it will be discharged thereby. The travelling
plate or bed continuing its rotation is re-fed as long as may be desired; it
might be so arranged that the rotation of the travelling bed need not be con-
tinuous, but the bed might move a certain distance and then stop and move
again until the rotation was completed. If at any time.the heat is desired to
be directed upon that portion of the oven which is nearest the furnace, and
abstracted from the other portion, the damper D must be closed and the
damper G opened, when the heat will pass from the furnace into the vertical
flue H, and thence passing through the pipes F, F, F, F', will be finally
discharged (as before) at the extremity of F* into the chimney. The sand
baths underneath the travelling bed are for the purpose of excluding the
smoke from the oven. The cast-iron balls are used because of the small
amount of friction and absence of any necessity for using oil or tallow for
-

page_text: lubricating. I find that a little blacklead sprinkled on their bed O acts
advantageously. The use of two sets of balls instead of one is preferable,
because the heat of the flue is thereby permitted to act directly on the
travelling plate, whereas with only one set of balls the heat would have to
pass through the bed O before it could reach the travelling plate J. The
sand underneath the main flue above the oven filling the vacant space formed
by the annular shape of the oven is only used as a cheap and ready non-
conductor of heat; any other non-conductor of heat would answer the same
purpose.
The biscuits might be discharged by means of revolving or rotating brushes
instead of the plate B³, shewn in the Drawings.
Having thus fully described the said improvements as communicated to
me by my foreign correspondent, and shewn how the same may be
conveniently and advantageously carried into practise, I wish it understood
that I do not confine myself to the exact details herein set forth; but I
claim,―
First, the construction of an annular or ring-shaped travelling oven.
Second, the balls P for supporting the travelling plate J, arranged and
operating substantially as set forth.
In witness whereof, I, the said George Haseltine, have hereunto set my
hand and seal, this Twenty-second day of April, in the year
Lord One thousand eight hundred and sixty-seven.
Witness,
5 WILLIAM ROBERT LAKE,
8, Southampton Buildings,
London.
GEORGE HASELTINE.
(L.B.)