Improvements in Apparatus for Artificially Lighting the Interiors of Bakers' Ovens and the like.
Year: 1898

page_text: Date of Application, 10th Mar., 1896
Complete Snonification Loft 10th Dean
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Date Apprivation, FL Mar. 1030
Complete Specification Loft, 10th Dec., 1900 Accepted, 4th Mar., 1999
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Artificially Lighting the Interiors of
Bakers' Ovens and the like.
We, WERNER, PFLEIDERER & PERKINS LD., Engineers, and WARWICK HENRY
BEANES, Engineer, both of 43, Regent Square, Gray's Inn Road, in the County
of Middlesex, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to artificially light bakers ovens and chambers
of a similar nature into which it is undesirable or impracticable owing to heat
fumes or other causes to place the illuminant.
For this purpose we construct a box of cast iron or other suitable material
which we build through the wall of the chamber to be lighted. For a bakers
oven we make this frame to extend through the wall of the oven near to one of
its sides. The inner end of this box that is to say the end which is inside the
chamber we provide with a moveable frame carrying a glass lens or lenses with
a reflecting prism extending out from it centrally at the back and somewhat
similar to those known as Wilson's dioptric pavement lights to reflect light to
the opposite corner of the front of the oven whilst the remaining outer portions
of the lens are adapted to throw a diffused light to the back of the oven.
The illuminant which may be gas, oil, or any other artificial light, we place
where circumstances permit within the box and in close proximity to the lens,
and behind it we place a polished metal reflector with curved surface to direct
the light on to the lens or lenses. In cases where the light cannot be placed
close to the lens, owing to heat, fumes, want of air for combustion, or other
causes, we place the light at the outer end of the box where the conditions are
more favourable, and by means of a parabolic reflector project a beam of light
on to the lens at the other end of the box, by which it is directed and diffused
inside the oven or other chamber.
It being necessary in certain cases that there should be no leak of any kin
either into, or out of the chamber through the lighting appliance, we construct
the frame which carries the lens and the end of the box with turned faces, which
admit of a close metallic joint, and to thrust the two faces together we provide
a handle which springs behind a projecting lug on the box and locks the frame
closely in position.
Where the light is fixed near the inner end of box with the reflector behind it
in such a position that it would be difficult to get at the light, we hinge the
reflector to the side of the box and connect it by means of a connecting link to
the door which shuts up the outer end of the box, therefore causing the act of
opening the door to withdraw the reflector leaving the burner exposed ready for
lighting. The act of shutting the door ensures that the reflector is returned to
ts correct position in relation to the light and is not forgotten by the operator.
The door is perforated at top and bottom to allow air to pass into and out of
he box.
The form of the lenses used we vary with the form of chamber, and the position

page_text: in which the light is to be placed, for instance, if a chamber is to be lighted
from the centre of one of its walls it would be provided with suitable lens or
lenses to direct the rays in both directions so as to illuminate the four corners.
Dated this 9th day of March 1898.
Improvements in Apparatus for Artificially Lighting the Interiors of
Bake: s'Ovens and the like.
We, WERNER, PFLEIDERER & PERKINS LD., Engineers, and WARWICK HENRY
BEANES, Engineer, both of 43, Regent Square, Gray's Inn 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:-
The object of this invention is to artificially light bakers ovens and chambers
of a similar nature into which it is undesirable or impracticable owing to heat
fumes or other causes to place the illuminant.
For this purpose we construct a box of cast iron or other suitable material
which we build through the wall of the chamber to be lighted. For a baker's
oven we make this frame to extend through the front wall of the oven near to one of
its sides. The inner end of this box that is to say the end which is inside the.
chamber we provide with a moveable frame carrying a glass lens or lenses with
a reflecting prism extending out from it centrally at the back and somewhat
similar to those known as Wilson's dioptric pavement lights (described in
Patent No. 258484) to reflect light to the opposite corner of the front of the oven
whilst the remaining outer portions of the lens are adapted to throw a diffused
light to the back of the oven.
The illuminant which may be gas, oil or any other artificial light, we place
where circumstances permit within the box and in close proximity to the lens,
and behind it we place a polished metal reflector with curved surface to direct
the light on to the lens or lenses. In cases where the light cannot be placed
close to the lens, owing to heat, fumes, want of air for combustion, or other
causes, we place the light at the outer end of the box where the conditions are
more favourable, and by means of a parabolic reflector project a beam of light
on to the lens at the other end of the box, by which it is directed and diffused
inside the oven or other chamber.
any
It being necessary in certain cases that there should be no leak of kind
either into, or out of the chamber through the lighting appliance, we construct
the frame which carries the lens and the end of the box with turned faces, which
admit of a close metallic joint, and to thrust the two faces together we provide
a handle which springs behind a projecting. lug on the box and locks the frame
closely in position.
Where the light is fixed near the inner end of box with the reflector behind it
in such a position that it would be difficult to get at the light, we hinge the

page_text: reflector to the side of the box and connect it by means of a connecting link to
the door which shuts up the outer end of the box, therefore causing the act of
opening the door to withdraw the reflector leaving the burner exposed ready for
lighting. The act of shutting the door ensures that the reflector is returned to
its correct position in relation to the light and is not forgotten by the operator.
The door is perforated at top and bottom to allow air to pass into and out of
the box.
The form of the lenses used we vary with the form of chamber, and the position
in which the light is to be placed, for instance, if a chamber is to be lighted
from the centre of one of its walls it would be provided with suitable lens or
lenses to direct the rays in: both directions so as to illuminate the four corners.
Figure 1 of the drawings annexed is a longitudinal section of a box casing C
formed as above described and carrying a single dioptric prism lens A; B is the
ring which holds the lens in position; D is the burner; E the reflector; F is a
handle which holds the lens in its place, by springing behind a stop fixed on the
bottom of the casing; when this handle is raised above the stop, the lens can be
removed for cleaning, by merely pulling it out of the casing; G is a connecting
rod, attaching the reflector to the door C. When the door is opened the reflector
turns back on the pivot H, and lies against the side of the casing; this enables
the burner to be seen and got at if it needs any attention. Care air passages
through the door for allowing air to enter and pass from the casing.
Figure 2 is a sectional plan.
Figure 3 an end view shewing how the prism A is surrounded by a number of
small shaped ribs A³, to diffuse the light which passes through that portion
of of the glass.
Figure 4 is a longitudinal section shewing a form of lamp D¹ the reflector E
of which is so shaped that it gathers the rays of light into a parallel beam, and
projects this onto the lens A, or series of lenses forming the oven light which
beam is afterwards diffused by means of the dioptric lens or lenses, over the
whole of the interior of the oven. The burner and reflector of this lamp can be
placed as far away from the lenses as is practicable, and is thus protected from
the disturbing effect of the heat of the oven. In this position it is much more
easily ventilated and where the illuminating effect is produced from oil this is
a matter of very great importance.
Figure 5 is a sectional plan.
Figure 6 an end view.
Figure 7 shews a pair of lenses A³ suitable for a lamp placed near the centre
of the oven front and which are arranged to project the rays right and left into
the dark corners immediately behind the front wall, as well as thoroughly illu-
minate the whole of the interior of the oven.
Figure 8 shews a sectional plan of an oven with lighting apparatus constructed
as above described placed on one side of the oven front.
Figure 9 is a similar view with the lighting apparatus placed at the centre of
the front.
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed, we declare that what we
claim is:-
:-
1. The use of the dioptric prism lens or lenses as described in apparatus for
lighting ovens and such like.
2. The use together with the dioptric prism lens of a lamp and reflector so
constructed and applied that the beam of light rays from the lamp or other
artificial source of light available, at a distance from the point where it is required,
is projected onto the lens or lenses by which it is thrown to the point or points
of the inside of an oven or like chamber requiring to be illuminated.
3. The combination of the box casing extending through the wall of the oven
or chamber to be lighted—fitted at its inner end with a readily removablé frame

page_text: carrying a glass prismatic lens or lenses at its inner end and with a lamp and
reflector inside the casing to reflect light to the lens substantially as described.
4. Apparatus for artificially lighting the interiors of bakers ovens and the
like constructed substantially as herein before described and illustrated in the
drawings annexed.
Dal 11.
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