Year: 1886

page_text: Date of Application, 2nd Dec., 1886
Complete Left, 2nd Sept., 1887
Complete Accepted, 22nd Nov., 1887
I, WILHELM ANTON FRIEDRICH WIEGHORST, of the firm of W. A. F. Wieghorst
and Sohn, Biscuit Manufacturers and Mill Owners, of New Strand Mill, Hamburg,
Germany, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in bakers' ovens ; and their object is to
facilitate the taking them to pieces for transport or other purposes, and the putting
them together again when they are to be put into operation, and also to obtain an easy
access to the baking chamber."
According to my said improvements an oven is constructed as follows. The fire
place is enclosed within a metal case lined inside with firebricks or other fireproof
material, and provided with suitable openings for the supply of fuel, for cleaning, and
for the escape of smoke. One of the walls of the said case is perforated, and through
it are passed the ends of pipes hermetically closed at both ends and partially filled
with water. These pipes, which are arranged in horizontal series, two or more,
above each other, serve to heat the baking chamber, in which their remaining
parts lie.
The baking chamber, which is preferably divided into several stories, is formed of
six walls constructed of double layers of sheet metal, the interval between the double
layers being filled with non-conducting material Each wall is a solid plate which is
jointed to the adjacent ones by screw bolts. A suitable frame attached to the
perforated wall of the fire-case serves to maintain the baking chamber and the fire
place in correct position relatively to each other.
The several stories of the baking chamber are provided with a pair of rails, whereon
carriages, bearing the material to be baked, may be rolled. These rails have outside
prolongations supported by suitable standards. As the doors locking the stories of
the baking chamber are arranged to slide up and down by means of rack and pinion,
the upper outside prolongations of said rails are constructed to be withdrawn, when
the doors of the lower stories are to be raised. This is effected by means of hand-
levers pivotted to the prolongations and connected with the standards.
The sliding doors are balanced by counter-weights attached to chains, which are
drawn over pulleys above the doors; thus the doors will be easily lifted and maintained
in any position desired.
Dated this 2nd day of December 1906

page_text: I, WILHELM ANTON FRIEDRICH WIEGHORST, of the firm of W. A. F. Wieghorst &
Sohn, Biscuit Manufacturers and Mill Owners, of New Strand Mill Hamburg,
Germany, 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 improvements in baker's ovens heated by means of
hermetically closed pipes partially filled with water; and the object of my improve-
ments is to facilitate the mounting, dismounting and shipping of such ovens.
I attain the said object by the mechanism illustrated in the accompanying drawings,
in which
Figure 1 is a side elevation of the entire oven; Fig. 2 is a longitudinal section;
Fig. 3 is a plan; Fig. 4 is a front view; Fig. 5 shews an arrangement for opening
the charging-doors; Fig. 6 is an end view of Fig. 5; Figs. 7, 8, 9, 10, 11, 12, 13,
14, 15 show details of side plates in several views and their connections.
The baking-chamber A being divided by horizontal partitions, suitably arranged,
with two or more compartments, is enclosed by six jacketted walls, viz., the bottom a,
the two side walls a', a¹, the top a³, the back a² and the front a³ (Figs. 2 and 3.). The
front a has openings with suitable doors for charging the oven, and consists of two
plates of either plain or corrugated iron. It is built up just like the other walls of
the oven, as will be described hereafter.
Two frames and are employed to hold the plates together. The frame 6¹, of
bar iron, is fixed to the front a³; while the frame b, made of angle iron, is fastened to
the fire-box B. The bottom a is fastened to the frame b, and is supported near the
front by the bracket d. The two sides a¹, a¹, are placed upright on the bottom a and
bolted to the frame b; the front a³, with the frame b', is attached to the three walls
already in position, and then the back plate a² is placed between the two sides a¹, a².
The top, a, which serves to perfectly close the baking-chamber, is supported by small
brackets, c, at the top of the sides a', a', (Figs. 2 and 3).
The back, a², is provided with several rows of holes, through which pass the heating
pipes, e, partially filled with water and with both ends closed. One end of each
heating pipe projects into the fire-box B, while the greater length of the pipe extends
into the baking-chamber, in order to conduct a uniform heat throughout the baking
oven. The pipes are supported on the rear end by the fire-box-plate, part of the
back a; and on the front end by the bars f (Fig. 2).
The spaces between the single iron plates forming the walls of the oven are filled
with non-conducting material to prevent radiation of heat. The two layers of sheet
iron are kept apart by stay-bolts g, (Figs. 7, 8 and 9); and fixed to the frames h of
channel iron, which are covered outside by iron plates k. In case of corrugated iron
being used, packings are rivetted to the inner face of the grooves. By means of
screws 1, screwed into the packings i, the corrugated iron plate is firmly attached to

page_text: the frame h, (Figs. 7 and 8).
shews an upper, edge, and
fire box.
Figs. 10 and 11 shew corners of sides plates a¹; Fig. 12
Fig. 13 a lower edge of the back a² as seen from the
Every horizontal compartment of the baking chamber is provided with tramways m
extending outside of the oven for the movable baking-plates, (Fig. 2 and 3). The
outer ends of the tramways are supported by posts p..
The hollow double-walled doors, adapted to shut against the face of the door-openings
for the baking oven, are pivotted to the front, a³, at their upper edges, (Fig. 4).
Either of the doors is provided with a pivot, n, extending beyond the side-wall of the
oven to receive a hand-lever t, a ratchet-wheel o, and a chain-wheel r, all fastened
thereon, (Fig. and 6). A chain, s, wound round about three quarters of the
circumference and fastened with its end to this wheel, leads over a guide roller, u, to
a counter-weight w, (Fig. 3 and 4), which balances the weight of the door. By these
means the oven door may be brought easily, by turning the lever t correspondingly
into any desired position, and will be kept therein by the pawl attached to the
stationary bearing of the extended pivot n, whereon the ratchet-wheel o is fastened.
The fire-box B is surrounded by metal plates, lined inside with fire-proof material,
and provided with grate, chimney and all necessary appliances.
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 :-
An improved baker's-oven, heated by means of a series of closed pipes partially
filled with water, consisting of the baking-chamber A, in combination with the
detachable fire-box B, the former consisting of jacketed and non-conducting walls a,
a, al and at, connected with screw bolts by means of the frame of the tube-plate a²,
and the frame 6, to which is attached the front-plate a³ containing the charging-doors,
all as and for the purpose set forth.
Dated this 2nd day of September 1887.