Improvements in the Manufacture of White Lead and Apparatus therefor.
Year: 1891

page_text: Date of Application, 22nd Dec., 1891
Complete Specification Left, 17th Oct., 1892-Accepted, 26th Nov., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of White Lead and Apparatus
therefor.
We, ROBERT BAINES JOHNSON, of 306, Burdett Road, White Lead and Color
Manufacturer, and THOMAS CASSIENET PALMER, of 98 Commercial Road,
Engineer, both in the County of London, do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements in the manufacture of white lead and
consists in the construction and application to drying stoves of apparatus for the
purpose of conveying the white lead to be dried into the stove and removing it
therefrom after drying without the necessity of handling, thereby preventing the
inhaling and absorbing of the dust and fumes by the workmen.
In a suitable arrangement for carrying out the invention we employ a series of
endless bands of metal, canvas or other suitable material mounted on revolving
drums or rollers at the ends of the stove and advantageously connected by chains
or steel bands in a brick or other chamber. Each band which forms a kind of shelf
is heated by a steam coil or plate of suitable capacity.
The white lead to be dried is brought to each band or shelf by an elevator, or
nill which may be slung by chains or fixed upon an elevator or lift, or the white
lead may be pumped on each band or shelf in a semi-liquid condition so that a
continuous feed of white lead may be supplied to the travelling bands and when the
white lead has reached the back of the stove the feed and travel of the band are
stopped. This operation is carried on for each band or shelf. The white lead is
then subjected to the heat from the coils for the time required for drying it and
when dry the bands are again set in motion so as to discharge the dried white lead
into suitable receivers. The feed is then again commenced and so on continuously.
I advantageously arrange in conjunction with the bands automatic mechanism for
throwing the said band in and out of gear and also for stopping the flow of lead
from the elevator or mill.
1001
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of White Lead and Apparatus
therefor.
We, ROBERT BAINES JOHNSON, of 306, Burdett Road, White Lead and Color
Manufacturer, and THOMAS CASSIENET PALMER, of 98, Commercial Road,
Engineer, both in the County of London, 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 :-
This invention relates to improvements in the manufacture of white lead and
consists in the construction and application to drying stoves of apparatus for the
purpose of conveying the white lead to be dried into and through the stove and
discharging it therefrom after drying practically without the necessity of handling,
thereby preventing the inhaling and absorbing of the dust and fumes by the
workmen.
In a suitable arrangement for carrying out the invention we employ a travelling

page_text: Figure 4 is an elevation; and,
Figure 5 a horizontal section on an enlarged scale to illustrate our arrangement
of travelling band and heating coil with the gearing for operating the band, the
said figures shewing in addition flues for the almission of fresh air and for the
discharge of the vapours formed in the drying operation.
Similar letters in all the figures indicate corresponding parts.
a, a, a represent the walls of the stove which in this case is shewn as made of
metal but it will be obvious that it may be made of brick or any other suitable
material such as wood; b, b are the travelling bands which can be made of metal,
canvas or other suitable material and, in some cases, may be made perforated.
These bands b, bare mounted on revolving drums or rollers, placed at the ends
of the stove, as shewn, so that each band forms a kind of shelf. ¹, represent
curbs or flanges fixed to the framing at each side of the shelves for the purpose of
preventing the white lead from falling off the shelves at the sides.
C
In practice we find it advantageous to adapt chains d to our bands, the said
chains passing over sprocket teeth e on the drums c, all as clearly shewn in
Figures 4 and 5.
ff, represent the steam coils (one coil for each band) by which the said bands
are heated.
These coils are supplied with steam from any suitable source by the
pipe connected to the coils by the branch pipes 7, each having a suitable valve i
for shutting off the steam as required. The exhaust steam passes out through
pipes jjj. Or instead of the coils we may employ steam plates for heating the
bands b.
The bands are driven by bevel-gearing k on the vertical shafts / which are driven
from the horizontal shaft m through the medium of the worm-gearing n but it will
be obvious that any other suitable driving mechanism may be employed. Suitable
means are provided such as a clutch o, as shewn at Figure 4, for putting the bands
in and out of gear.
p is an elevator for supplying the white lead to be dried to the bands or shelves
by means of the adjustable sliding shoot p¹ but it will be obvious that the lead can
be supplied by hand or by a mill or other mechanism which may be slung by chains
or fixed upon an elevator or lift for the purpose of feeding each band, or the white
lead in a semi-liquid condition may be pumped onto each band or shelf.
a, g represent doors at the back of the stove, one door being provided to close the

page_text: discharge opening of each band. r represents a shoot into which the dried white
lead is discharged and a truck for receiving the same; t represents the openings
in the front of the stove through which the white lead is supplied from the elevator
or other source.
In Figure 5 u represents a flue for admitting fresh air to the shelves, which air
is heated by a coil (not shewn in the drawing) and serves to facilitate the drying
operation. is a flue for carrying off the vapours produced by the drying
operation. Heated air from the flue u passes over the bands through suitable
openings one of which is shewn at v, Figure 4, similar openings being formed in the
flue u for the escape of the vapours.
The operation is as follows -The white lead to be dried is brought to each band
or shelf by the elevator p and a continuous feed of white lead is supplied to the
said travelling bands. The bands are kept moving until they are fully covered
whereupon their travel is stopped as is also the feed. As soon as the white lead
shall have been subjected to the heat from the coils f for the time required for
drying it the bands are again set in motion, and as the bands continue to travel
the dried white lead is discharged into the shoot and is removed by the truck s
or other suitable receiver.
It will be understood that any one or more of the bands can be stopped without
stopping the others, that is to say, it is not necessary to work all the bands together,
each band being self-contained and complete in itself.
In some cases suitable automatic mechanism may be advantageously employed
for throwing the bands in and out of gear and also for stopping the flow of lead
from the elevator or other mechanism which supplies it.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. The combination with a drying stove for white lead of a travelling band or a
series of travelling bands forming a shelf or a series of shelves, the said bands being
heated by steam coils (or steam plates) and having an intermittent motion
communicated to it or them in the manner and for the purpose substantially as
described.
2. The improved apparatus for drying white lead constructed, arranged and
operating substantially as hereinbefore described and illustrated in the several
figures of the accompanying drawings.
Did this th 1
L1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.