Improvements in or relating to Draw-plate Ovens.
Year: 1899

page_text: Date of Application, 14th July, 1899-Accepted, 30th Sept., 1899
COMPLETE SPECIFICATION.
Improvements in or relating to Draw-plate Ovens.
I, GEORGE SAMUEL BAKER, Engineer, of 58, City Road, in the County of
Middlesex, 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:
-
This invention relates to draw-plate ovens.
According to this invention the draw-plate moves on wheels, of which some
travel on fixed rails in a chase within the oven, whilst the others travel on the
bake-house floor, on rails thereon. It is an important feature of this invention
that the draw-plate is carried within the oven by the spindle of free wheels which
forms a rolling support for it, and that the draw-plate does not overhang the
wheels but extends down into and also across the space between them, the con-
struction of the draw-plate being thereby simplified; further
chases" or
grooves are provided for the wheels within the oven to travel in in order that
there may be no unnecessary width of clearance between the sides of the draw-
plate and the oven walls.
In the accompanying drawings:
Figure 1 is a longitudinal central section of a draw-plate oven according to
this invention;
Figure 2 is a view of a portion of Figure 1 showing the draw-plate and free
wheels in the relative positions assumed when the draw-plate is drawn out to the
fullest extent.
Figure 3 is an elevation of the front of the oven with the door and lower front
plate removed.
The draw-plate A has at its front end an extension A'; in bearings at the
lower end of the latter is a shaft B carrying wheels B which travel upon rails C
in the bake-house floor.
Rails D are secured in the interior of the oven at opposite sides thereof and
extended through slots in the oven door E which is operated with the help of
counterweights E' into casings F secured upon the oven front; within these
casings each extension of the rail is turned up into a hook D' as shown in
Figure 1, for a purpose hereinafter explained.
The free wheels previously referred to are shown at G; they travel on the
rails D within the oven in a
chase"
or groove D2 in each of the walls and are
rigidly connected to each other by an axle G¹ extending transversely beneath
the inner end of the draw-plate A, and forming a roller bearing for the under-
surface of the draw-plate which travels upon that axle. The chases 1) are pro-
vided for the wheels D in order that whilst the draw-plate does not overhang
the wheels there may be no unnecessary width of clearance between the sides of
the draw-plate (which extends down into the space between the wheels) and the
adjacent walls of the oven; the wheels if the chases were not provided, would
necessitate a clearance capable of receiving them, and therefore exceeding con-
siderably that which is shown in Figure 3. When the draw-plate A is pulled

page_text: out of the oven in the direction indicated by the arrow in proximity to it in
Figure 1, the free wheels G travel along the rails B in the same direction, but at
a slower speed, because they are rotated by the action of the under-surface of the
draw-plate A upon the periphery of the axle G₁; the radii of the axle G¹ and
wheels G are of such ratio to one another that when the draw-plate has reached
the extreme position in which it is indicated in Figure 2, the wheels G will be
stopped by coming into engagement with the hooked portions D¹ of the rails D
as shown, and the downwardly extending flange A2 at the inner end of the draw-
plate will have come into contact with the axle; thus, the flange A2 on the draw-
plate being checked by the axle G¹ and the latter being in turn stopped by
reason of the engagement of the wheels G with the hooked portions 1 of the
rails D, the draw-plate is prevented from coming too far out of the oven.
The draw-plate is so constructed that when it and the wheels are drawn right out
into the position described the oven door can shut down behind it, and when it
is pushed inward to the extreme of its travel in the opposite direction the oven
door shuts down on a shoulder A³ extending across the front end of the draw-
plate.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is: —
1. In an oven the combination with a draw plate extending substantially
entirely across it of a "chase" or recess such as D2 in the wall of the oven for
the purpose described.
2. In an oven the combination with free wheels having an axle extending
between them of a draw-plate resting upon the axle and lying between the wheels
substantially as described.
"
"
3. In an oven the combination with free wheels having a draw-plate rolling on
their axle and extending across the space between them of a chase or recess
in each wall of the oven which receive the wheels substantially as and for the
purpose described.
4. The complete draw-plate oven substantially as and for the purpose described
and illustrated in the accompanying drawings.
141
T1 1000
GEORGE SAMUEL BAKER.
Boult and Wade,
Agents for the Applicant.