CERTAIN IMPROVEMENTS IN APPARATUS FOR GIVING MOTION TO THE ROLLS USED IN ORDINARY GALVANIZING ROLLER BATHS, FOR COATING METALS, SO AS TO PREVENT THE SURFACE OF THE MOLTEN METAL FROM BEING DISTURBED, THEREBY PREVENTING ANY OXIDATION OR DETERIORATION TAKING PLACE DURING THE PROCESS OF WORKING
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by John Tagell at the Office of the
Commissioners of Patents on the 8th October 1880.
JOHN TAGELL (of the Firm of Marr and Tagell, Engineers), of Smethwick, in
the County of Stafford. "CERTAIN IMPROVEMENTS IN APPARATUS FOR GIVING
MOTION TO THE ROLLS USED IN ORDINARY GALVANIZING ROLLER BATHS, FOR
COATING METALS, SO AS TO PREVENT THE SURFACE OF THE MOLTEN METAL
FROM BEING DISTURBED, THEREBY PREVENTING ANY OXIDATION OR DETERIORATION
TAKING PLACE DURING THE PROCESS OF WORKING."
My Invention consists of the improvements hereinafter described, in the
machinery employed, in relation to ordinary Galvanizing Roller Baths. On the
top of such baths, I bolt or otherwise secure a suitable casting running the length-
ways of the bath and at each end of which I secure a Plummer-block, through
which runs a horizontal shaft, say about fifteen inches from the top of the said
bath. At one end of this horizontal shaft are the pulleys or gearing receiving the
power for giving motion to the apparatus (about to be described) by steam or other
power, and at the other end I key on a bevel wheel which gears into a correspond-
ing bevel wheel that drives a vertical shaft, which said vertical shaft at its lower
end by means of suitable gearing actuates the horizontal rollers working in the
bath through which the sheets of metal are drawn in the process of coating.
On the top of the said bath and on the wrought iron frame carrying the
horizontal rollers which are in the metal bath, I secure a suitable cast iron bracket
to which is secured a metal tube with a flange at the top end for securing it to the
cast iron bracket.
This tube is of sufficient length to enter the molten metal contained in the bath
some five or six inches. Through this tube and cast iron bracket the vertical shaft
works, pressure being imparted to the top roll by means of a weighted lever as
in the ordinary way.
In the construction of the ordinary galvanizing roller baths now in use, the
horizontal shaft works some three or four inches from the top of the bath, and
motion being given to the horizontal rolls by spur gearing. The spur wheel fixed
to the horizontal shaft which gives motion to the rolls, works through the molten
metal some three or four inches below the surface, consequently when working the
spur wheel is gathering up and throwing off the coating metal which becomes

page_text: oxidised through its exposure to the air, and therefore the wheel becomes clogged
up and requires to be constantly cleared.
The oxidised metal thus cleared from the wheel is valueless or nearly so, which
entails a very great loss. In my improved arrangement for driving the horizontal
rolls, this is entirely obviated, as the vertical shaft which gives motion to the rolls
(working through the fixed tube before referred to) does not disturb the surface of the
metal, therefore oxidation or deterioration of the coating metal does not take place.
This must be a very great desideratum.