Improvements in and relating to Baths for Coating Metallic Plates.
Year: 1892

page_text: Date of Application, 11th May, 1892
Complete Specification Left, 10th Feb., 1893-Accepted, 15th Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in and relating to Baths for Coating Metallic Plates.
I, WILLIAM HENRI LUTHER, of Petershill Road, Glasgow, Lanarkshire,
Manufacturer, do hereby declare the nature of my invention to be as follows :-
This invention has reference to and comprises a new or improved method of and
construction of bath for galvanizing tinning or coating iron or other metallic plates
or sheets, whereby long lengths of sheet metal may be operated on and oxidation
prevented or lessened, and the molten or coating metal be economised.
By my improvements I construct the bath of a semicircular, U, or equivalent
inner hollow or dish shape with a correspondingly shaped outer annular pocket
space or chamber in which I place the galvanizing or coating metal which may be
spelter or zinc, lead or other metal. This segmental bath would be heated by a
coal, gas, or oil fuel furnace, from which the products of combustion or heating
gases would pass under and round the exterior sides of the molten metal containing
chamber of the bath, and return through the inner hollow central space which
would act as a return flue to heat the inner surfaces of the molten bath, and this
inner central space may be either close covered or open. By these improvements
long sheets of metal such as thirty feet or more may be led through the coating
bath, by being fed through between inlet feed rolls and passed round curved or
angled guides or rolls and delivered through the annular space at the opposite side
of bath. In this new construction of bath as the molten metal would be at a
lower level in the centre than at the sides metals of different specific gravities may
be used, and the heaviest metal such as lead would lie or concentrate at the central
or lower part, while the lighter coating metals such as spelter would lie separate at
a higher level on each annular curved side, and the flux, such as muriate of ammonia
would lie on the top surfaces.
Dated the 20th M 1000
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to Baths for Coating Metallic Plates.
1, WILLIAM HENRI LUTHER of Petershill Road, Glasgow, Lanarkshire
Manufacturer, do hereby declare the nature of my invention, and in what manner
the same is to be performed, to be particularly described, and ascertained in, and
by the following statement in writing that is to say:—
This invention has reference to, and comprises a new or improved method of, and
construction of bath for galvanizing, tinning, or coating iron or other metallic plates
or sheets whereby long lengths of sheet metal may be operated on, and oxidation
prevented or lessened, and the molten or coating metal be economised.
And in order that my said invention, and the manner of performing or carrying
the same into effect or practice may be properly understood, I have hereunto
appended an explanatory sheet of drawings in which
Figures 1 and 2 represent a sectional elevation and sectional plan of a bath, and
its fittings, as heated by a coal fire, and
Figures 3 and 4 are views corresponding to Figures 1 and 2 showing the bath
fittings, as modified to suit for heating the bath by oil fuel.
Referring to these drawings:-By my improvements I construct the bath of a
semicircular U or equivalent inner hollow or dish shape A' with a correspondingly
Prindl

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shaped outer annular pocket space or chamber A by the inner and outer
plates A A in which space the galvanizing, or coating metal, which may be
spelter or zinc, lead, or other metal, and preferably protected by a covering of fire-
bricks B between it and the furnace B. This segmental bath A would be heated
by the coal fuel furnace B as shown in Figures 1 and 2 in which case the products
of combustion would preferably pass from the furnace grate C along a flue C¹
under and to one side of the chamber A A' and also forward through the upper
flue A and the combustible gases from both flues meet at the back part C³ and
return through another side flue C similar to C¹, and then pass away at C' to the
chimney or uptake, all as indicated by the arrows in Figures 1 and 2. Or when
oil fuel is used to generate heat as by a spray of steam or compressed air in lamps D
as shown in Figures 3 and 4 the products of combustion or heating gases would
pass from these lamps D forward through the flues C¹ C' at the exterior sides of
the molten metal containing chamber A A' of the bath, and be deflected, by the
back baffle dividing wall B of the brickwork, and return at C³ through the inner
hollow central space A which would act as a return flue to heat the inner surfaces
of the molten bath, and this inner central flue space A would be close covered by
a top plate A³ and thus heat the metal below and through the centre of the bath.
In some cases a lower central heating flue may be used instead of or in addition to
the side flues C¹, C².
By these improvements long sheets of metal such as thirty feet or more may be
led through the coating bath A by being fed through between inlet feed rolls a a¹
and passed round curved or angled guides or rolls all a³, and delivered through the
annular space at the opposite side of bath to the inlet.
The rolls a¹ are driven to rotate at the same speed through the gear pinions a
the one roll a' being fitted with a spring a', so as to be adjustable to suit different
sizes of plates passed through the bath A, and the spindles of these rolls receive
motion through the train of gear wheels Z shown in Figure 2 much as usual.
In this new construction of bath A, metals of different specific gravities may be
used, and the heaviest metal b such as lead would lie or concentrate at the central
or lower part while the lighter coating metals 61 such as spelter would lie separate
at a higher lever on each annular curved side, and the flux 6 such as muriate of
ammonia would lie on the top surfaces.
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 :—
First. The constructing of baths for coating metallic plates with a semi circular U
or equivalent shaped pocket chamber for retaining the galvanizing or coating
molten metal, and through which the plates to be treated are passed, substantially
as herein described in reference to and shown in the accompanying drawings.
Second. The constructing of baths for coating metallic plates with a semi-
circular or equivalent shaped pocket chamber for the molten metal, a
corresponding inner hollow or dish shaped chamber or flue space, and a lower or
under heating flue or flues, substantially as herein described in reference to and by
way of application shown in the accompanying drawings.
Dated 9th February 1893.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.