Improved Means and Apparatus for Coating Sheet Iron (Galvanizing) and Finishing same..
Year: 1889

page_text: Date of Application, 6th Dec., 1889
Complete Specification Left, 6th Oct., 1890-Accepted, 8th Nov., 1890
PROVISIONAL SPECIFICATION.
Improved Means and Apparatus for Coating Sheet Iron (Galvanizing)
and Finishing same..
I, THOMAS HENRY JOHNS, of 164 Millfields Road, Clapton, Middlesex, Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention relates to certain novel process or means and apparatus connected
with the galvanizing of metal plates.
For the purpose of my invention, I employ two baths of different temperatures and
containing spelter or other metal or alloy, into and through which the plates to be
coated are successively passed. The lower temperature bath is the second one and the
metal in it may be softer than that of the first. The time of passing each plate from
one bath to the other, enables the first coating to partially settle and the heat to be the
same as that of the second bath.
The plates then pass between a pair of uneven surfaces (heated internally) to
remove the superfluous metal, and then between high surfaced rollers, which finish the
plates.
alatan aza nafomable fad into the first bath by heated rollers.
Dated this 6th day of December
1660
H. GARDNER,
166, Fleet Street, London,
Agent for the said Thomas Henry Johns.
H. GARDNER,
166, Fleet Street, London,
Agent for the said Thomas Henry Johns.
COMPLETE SPECIFICATION.
Improved Means and Apparatus for Coating Sheet Iron (Galvanizing)
and Finishing same.
I THOMAS HENRY JOHNS, of 164 Millfields Road, Clapton, Middlesex, Engineer,
do hereby declare the nature of said 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 certain novel process or means and apparatus for the
galvanizing and the finishing of metal plates at one operation.
For the purpose of my invention I employ two baths of different temperatures and
containing spelter, or other metal, or alloy into and through which the plates to be
coated on one or on both sides are successively passed.
The lower temperature bath is the second one and the metal in it may be softer than
that of the first. The time of passing each plate from one bath to the other enables
the first coating to partially settle and the heat to become the same as that of the
second bath. The plates then pass between scraping surfaces (heated internally) to
remove the superfluous metal and leave the plate in a finished state or to obtain a
higher polish they may be passed between high surfaced rollers.
The plates are preferably fed into the first bath by heated rollers.
Figure 1 of the annexed drawings represents a sectional elevation of a stove in or
by which plates of iron or other desired metal can be coated by a different metal,
similar to that known as galvanized.
The stove consists of a brickwork or cast iron structure A lined with fire brick, with
two fire places B, B1, for heating the two pans C, C³, to different temperatures for the
proper coating process.
The first pan C is provided with a funnel shaped hopper D this having rolls E, E,
therein for guiding the plate F through the flux and into the first coating fluid metal
said plate passing through it to the rolls G, G, which act for the purpose of drawing

page_text: the plate from the bath C the superfluous metal is scraped off in passing. The plate
guided by the guard I is led to another pair of rolls J, J, and thence into and through
the fluid metal in the second pan C', this having also a flux in its hopper K to cause
the fluid metal in the second pan to adhere to that from the first pan
C.
The plate with the second layer of metal or surface coating is similarly scraped and
leaves the second pan by the draw out rolls L, L, and from thence the plate passes
between a pair of V grooved draw rolls M, M, mounted vertically, thence between
scrapers N, N, to finish the plate, and lastly between other V grooved draw rolls P, P.
The scrapers N, N, are of triangular form and should one edge become crusted or
dirty, a fresh edge can be brought into action.
The scrapers N, N, may be of lozenged shape, as at Figure 2, angled slots, as at
Figures 3 and 4, or by edges formed by slots in a tube, as at Figure 5, in all of which
cases the scrapers are kept to a desired heat by internal gas flames.
The passage of the plate from the first to the second pan gives sufficient time for
the first coating to partially "sett" and leave it in condition to receive the additional
coating in the second pan. The draw rolls may be .horizontal, as at Figure 6 for
nipping the plate on the surface edges.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. The hereinbefore described method of coating sheet iron with a spelter or other
metal by passing it through two contiguous baths of fluid metal at different tem-
peratures and by apparatus, substantially as shown on the annexed drawings.
2. The particular arrangement of contiguous pans of fluid metal or metals whereby
iron plates can be fed into and from each pan in succession, be scraped in transit, and
issue in a twice coated and a finished condition as set forth with reference to the
annexed drawings.
3. In combination with contiguous baths of fluid metal at different temperatures the
vertical rolls with horizontal V grooves for engaging the horizontally issuing plate by
its edges and drawing the same from the second bath with a simultaneous scraping to
finish said plate, as described and substantially as shown by the annexed drawings.
4. In combination with contiguous baths a scraping of the issuing plate for finishing
purposes substantially in the manner set forth.
The 6th day of October 1890
H. GARDNER,
166, Fleet Street, London, Patent Agent,
Agent for the said Thomas Henry Johns.