Year: 1885

page_text: We JOSEPH BAKER JOSEPH ALLEN BAKER and WILLIAM KING BAKER of
58 City Road, in the County of Middlesex, Engineers do hereby declare the nature
of this invention and in what manner the same is to be performed, to be par-
ticularly described and ascertained in and by the following statement :-
The Invention consists of two doors-one a blank door and the other provided
with a lighting apparatus and mechanism for operating them.
In the accompanying drawings Figure 1 is a front sectional elevation and
Figure 2 a sectional plan, Figure 3 is similar to Figure 2 but with the doors
reversed: Figure 4 is a front elevation with the door open. Figure 5 shows the
lighting apparatus and Figure 6 are details.
The door A is an ordinary door and when shut entirely closes the aperture in
the framing B-The door C is clearly shown in Figure 5 it consists of the frame C
and lantern consisting of the top and bottom projecting plates C¹ and C³ and trans-
parent cover C preferably made of talc-The gas pipe D which supplies the
burner D' is connected with a swivel joint D* whose centre of motion is concentric
with that of the hinges of the door, the false bottom C* is perforated to allow the
passage of air to the burner. C can be removed as also can the reflecting cone C³
and gas pipe D and burner D¹ when required for cleaning purposes and the like.
E is a reflector which may be fastened by the hasp E-C is a projecting arm
secured to C by which it is opened and shut.
F is a shaft suitably journalled in the frame B and operated by the weighted
lever F which serves also to retain it in the position in which one of the doors is
shut This shaft F carries the fork G Figures 6 and 7 in the hollow of which the
arm A¹ of door A rests so as to be moved by either arm of the fork according as
the door is to be opened or shut. It will be readily understood that by turning
shaft F to the left, door A is opened, and by turning it to the right, the door will
be closed. On shaft F is the bevil wheel H which gears with another bevil wheel I
on the shaft K, which carries a second fork L for the purpose of working the door C
by means of the arm C³ which enters the hollow in Ĺ just as the arm A' did with
fork G. The action of L is shown in Figures 8 to 11. The two forks G and L
therefore work together simultaneously but are so set on their respective shafts

page_text: Thns
that as the movement of one door finishes that of the next door commences.
taking the position of the doors in Figare 2 to move them the shaft F would be
turned to the right the weighted lever F¹ traversing the arc above the plane of the
shaft the fork L being in position would take hold of C and open door C and just
as this finished fork G would take hold of A¹ and close door A-Turning the
shaft F back again would have the opposite effect and restore the doors to the
position shown in Figure 2.-The webs, flanges or cams G¹ and L' are so shaped
that they come in contact with the arms A¹ and C and hold their respective doors
open so that the forks may take hold of the arms properly when required and the
doors cannot swing about.
°
The swivel joint D³ is preferably arranged so that when door C is closed as
shown in Figure 2 the flame is full on but when open and the light is not required
it is turned down low.
The light is quite protected by its lantern from contact with the steam with
which the oven is frequently filled air being supplied through the perforations in
plate C from the main chamber M which is supplied from the outside through
openings in the plate N as shown in Figure 4. The pipe O Figure 1 serves to
carry off the products of combustion.-The two doors may be arranged to move
simultaneously so long as they do not touch in passing.
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. The combination in an apparatus such as described of two doors such as A
and C so connected by the operating mechanism that they move in opposite
directions but without touching substantially as specified.
2. In an apparatus such as described the combination with a door such as C
carrying a gas jet D1 of a lantern such as C1 C2 C³ for the purpose of protecting
the flame from the steam of the oven substantially as specified.
3. In an apparatus such as described the combination with the doors A and C
of shafts F K and forks G, L substantially in the manner and for the purpose
specified.