Improvements in Doors for Drawplate Ovens.
Year: 1897

page_text: Date of Application, 10th June, 1897
Complete Specification Left 7th Anc 1808 Accented 7th May 1000
Date of Application, 10th June, 1897
Complete Specification Left 7th Apr 1808 Accepted, 7th May, 1908
Improvements in Doors for Drawplate Ovens.
JOHN MELVIN, St. Rollox Iron Works, Charles Street, Glasgow, Scotland,
Engineer, do hereby declare the nature of this invention to be as follows:-
-
An improved door used particularly in connection with drawplate ovens, whereby
the outside temperature is greatly reduced. The door for such ovens require to
be the full width of baking chamber to enable the drawplate to be run out on rails
in the usual way. Such a great width of door presents a large surface to the
internal heat & the usual construction viz:-hollow in section & entirely filled
with non-conducting material, is insufficient to prevent the outer surface becoming
unduly hot.
My improved door is divided from back to front into 2 compartments. The
outer compartment is an air space with inlets for cold air at the bottom, & outlets
for hot air at the top, while the inner compartment is filled with non-conducting
material. A constant current of air passes up through said space, & any heat which
may penetrate the non-conducting material is at once carried off, thereby keeping
the front face of the door absolutely cool.
Dated this 9th day of June 1897
improvements in Doors for Drawpiate Ovens.
JOHN MELVIN, St. Rollox Iron Works, Charles Street, Glasgow, Engineer, 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:.
:-
An improved door for ovens known as drawplate ovens, in which the outside
surface of the door is greatly reduced in temperature.
The door for such ovens requires to be the full width of baking chamber to
enable the drawplate upon which the goods are baked to be run out on rails in
the usual way. Such a wide door thus exposed to the internal heat of the oven,
when made in the usual way passes through a considerable amount of heat which
is objectionable to the user of the oven. My improved door is designed to remedy
this objection.
In order that my said invention may be particularly described and ascertained,
reference is hereby made to the accompanying drawings:-
_
Fig. 1 represents a front elevation of the door, and Fig. 2 a section of same.
The reference letters denote equivalent parts.

page_text: Door A slides vertically within guides bb on face of oven front C, the weight of
door A being balanced by chains d d and weight e.
F is the usual carriage, and G the rails upon which drawplate H. runs.
The door A is hollow in section and divided into 2 compartments, the inner
compartment c contains silicate cotton, or other non conducting material, and
the other compartment f is an air space.
Air space has a number of inlet holes g at bottom, and outlet holes h at top.
A constant circulation of cold air entering at g passing upwards through f and out
at h keeps the front face of door cool.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1 Drawplate oven doors having a circulating air space to keep the outside surface
cool all as described.
2 Drawplate oven doors having an outer circulating air space in combination
with an inner packing of non conducting material all as described.
JOHN MELVIN.