Certain Improvements in Oven and other Heating and Fire- chamber Doors.
Year: 1890

page_text: Date of Application, 1st July, 1890-Accepted, 16th Aug., 1890
CUM LEIN DIECIFICATION.
Certain Improvements in Oven and other Heating and Fire-
chamber Doors.
1, PETER ABRAHAMSON, residing at No. 1022 Hyde Street, in the City and County
of San Francisco, State of California, one of the United States of America, Tinsmith,
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 heating and fire-chambers; and it consists in the novel
arrangement and construction, hereinafter described, of the air-passages in the doors
of said chambers.
The object of my invention is to provide for a thorough ventilation of the oven or
other chamber, whereby its efficiency is greatly increased.
Though my invention is applicable to the door of any heating or fire-chamber, I
have herein shown in the accompanying drawings an oven door constructed according
to my invention.
Figure 1 is a view of the outer side of the door.
Figure 2 is a view of its inner side.
The door A is made of the ordinary shape.
On its inner surface is formed or secured a hollow casing represented by B, and
which extends from about the vertical center of the door along the upper portion
thereof to one end, and thence down to its lower portion. A similar hollow casing C
is secured or formed on the inner surface of the door, which commences at a point
about the vertical center of said door, and thence extends along the lower side to the
other end, and thence upwardly to its upper portion; these casings then form
continuous passages.
Through the door is made an opening b, which is controlled by a sliding or other
damper, and said opening communicates directly with the upper end of the casing
or passage B. In the lower end of said casing or passage, on its inner side, is
made an opening 2, which communicates directly with the oven.
In the door at its lower portion is made an opening c, which is controlled by a
sliding or other damper c', and which communicates with the lower end of the casing
or passage (, and in the upper end of said casing or passage, on its inner side, is made
an opening c², which communicates directly with the oven.
In operation, the exterior cold air enters through the opening b, and thence
traversing the entire length of the passage B, is admitted into the oven through the
opening
The interior air of the oven passes into the passage C, through its opening c² within,
and thence throughout the entire length of said passage, and is discharged exteriorly
through the opening c.
By these means a perfect and complete ventilation of the oven is provided. The
incoming air is not admitted to the oven in a cold condition, but by traversing a
passage B, which, by the course described, is a long one, becomes sufficiently heated
before it is admitted to the oven, to avoid any appreciable cooling of the air within
the oven, and likewise the length of the passage C provides for avoiding the discharge
of heated air too soon.
In my construction, therefore, I provide proper ventilating passages, giving them
the required length to avoid a too sudden influx or efflux of air, and at the same time
conducting them in courses practical in such doors, and without interfering at all with
their complete function.
This invention, as applied to the doors of other heating and fire-chambers, serves
the same purpose of thoroughly ventilating them. In this construction I lav especial

page_text: importance in the course of a single passage through which the exterior air is
admitted properly to the chamber, purifying it and driving out the impure air which
can escape through any suitable passage. In the oven door the second passage is
used only when the oven is too hot.
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. A door for ovens and other heating and fire-chambers having oppositely-
arranged hollow casings on its inner side, each casing having an opening com-
municating with the interior of the oven or chamber and with damper-controlle:
openings in the door.
2. A door for ovens and other heating and fire-chambers, having on its inner
surface a hollow casing conducted in the course described, and having openings
communicating with the interior of the oven or chamber and with a damper-
controlled opening in the door, and an exhaust passage leading from the oven or
chamber through the door.
3. A door for ovens and other heating and fire-chambers, having on its inner
surface a hollow casing forming an independent passage extending from the upper
central portion of said door to one end and down said end to its lower portion, and a
second hollow casing forming an independent passage extending from the lower
central portion of said door to the other end and up said end to its upper portion, a
damper-controlled opening through the door communicating with the upper end of the
first passage, a damper-controlled opening through the door communicating with the
lower end of the second passage, an opening in the lower end of the first passage
communicating with the interior of the oven or chamber, and an opening in the upper
end of the second passage communicating with the interior of the oven or chamber,
substantially as described.
dth: 1...
I 1900