Improvements in Apparatus for use in Drying White Lead.
Year: 1898

page_text: Date of Application, 14th Dec., 1898
Complete Specification Left, 14th Sept., 1899-Accepted, 11th Nov.,
1899
Improvements in Apparatus for use in Drying White Lead.
We, HARRY CARVICK WEBSTER, Managing Director of Messrs. Alexander,
Fergusson and Company, Limited, 36 to 48, McAlpine Street, in the City of
Glasgow, Paint, Colour and Varnish Manufacturers, and THOMAS FRENCH,
Chemist with said Firm, do hereby declare the nature of this invention to be
as follows:-
This invention has for its object the provision of apparatus for use in drying
white lead and designed in large measure to replace hand labour in conducting
that operation.
Hitherto the wet lead from the grinding mills has been filled into shallow
basins and conveyed by hand on to shelves or racks fitted up in a heated drying
chamber which had to be allowed to cool before the dried material could be
removed. By means of the present invention in which the operations of charg-
ing the drying chamber and of emptying it are effected mainly by mechanical
appliances, cooling down of the chamber and consequent loss of heat is avoided
and time is economised, whilst the workmen no longer require to enter the
drying chamber and inhale its dust laden atmosphere.
In carrying out the invention the drying chamber, which is heated in the
usual way by hot pipes or flues led along the floor from a furnace or by other
means, is formed with a number of shallow doorways arranged in vertical rows
in the front wall and closed by sliding doors.
From each of these doors horizontal or slightly inclined rails extend to the
rear of the drying chamber and on to the rails are run small bogies or wheeled
trucks containing the white lead to be dried, the chamber being thus filled with
the boxes supported on the rails in tiers. For the purpose of charging and
emptying the chamber through the rows of doorways a vertically movable plat-
form or hoist is employed extending across the front of the chamber and fitted
with turntables one opposite cach door; and for conveying the bogies to this
platform from a siding in which they are filled a second hoist is used and is
divided into compartments by horizontal turntables on each of which a bogie
is carried. The siding is a miniature railway or sets of rails on to which the
bogies are run and filled from an overhead tank. From the siding the bogies
when filled with the white lead are run one into each compartment of the
hoist which is raised or lowered to bring the compartments to the level of the
rails in the siding and thereafter each in turn to the level of the movable plat-
form on to which the bogies are run after being turned round on the hoist. The
bogies are run one at a time opposite each doorway on one level of the drying
chamber front, are there turned and run on to the rails within the chamber, and
this operation is repeated until the bogies at that level extend from the rear wall
to the doorways, whereupon the doors are closed and the platform raised to the
level of the next row of doorways. A series of bogies are then run in like
manner on to the rails at that level, and the platform again raised and the

page_text: charging operation proceeded with at the level of the next row of rails and so
on until the drying chamber is fully charged.
When the drying operation is completed the bogies are drawn out through
each door on to the platform, the withdrawal of the bogies being facilitated by
the use of winches or chains and chain pulleys on a rotating shaft in front of
the platform; and by having the bogies coupled by means of automatic couplings
fitted to them. From the platform the bogies containing the dried white lead
are run into the compartments of the hoist and raised to a concrete or other
floor forming the roof of the drying chamber, that floor being fitted with turn-
tables for convenience of turning the bogies. From this floor the bogies are
run through doorways each into one of a series of tipping tables or cages fitted
within an enclosed bin alongside of the drying chamber into which the dried
white lead is discharged. These tipping tables are each composed of an open
iron framing on which a bogie rests and is held whilst the table which is carried
on a shaft or trunnions is tilted over to empty the bogie. The tilting of the
tipping table is or may be effected by means of a crank handle or gearing operat-
ing a worm shaft acting on a worm wheel on the axle of the table. The bin is
connected by a pipe or flue to a chimney or other means for ensuring a strong
inward draught through the doorways whilst they are opened to admit the bogies
to the tipping tables.
ב
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents, 62, Saint Vincent Street, Glasgow,
Agent for the Applicants.
Improvements in Apparatus for use in Drying White Lead.
We, HARRY CARVICK WEBSTER, Managing Director of Messrs. Alexander,
Fergusson and Company, Limited, 36 to 48, McAlpine Street, in the City of
Glasgow, Paint, Colour and Varnish Manufacturers, and THOMAS FRENCH,
Chemist with said Firm, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
-
This invention has for its object the provision of apparatus for use in drying
white lead and designed in large measure to replace hand labour in conducting
that operation.
Hitherto the wet lead from the grinding mills has been filled into shallow
basins and conveyed by hand on to shelves or racks fitted up in a heated drying
chamber which had to be allowed to cool before the dried material could be
removed. By means of the present invention in which the operations of charg
ing the drying chamber and of emptying it are effected mainly by mechanical
appliances, cooling down of the chamber and consequent loss of heat is avoided
and time is economised, whilst the workmen no longer require to enter the
drying chamber and inhale its dust laden atmosphere.
The invention is illustrated by the accompanying drawings, Fig. 1 being a
front elevation partly in section of the apparatus, Fig. 2 a transverse vertical
section, and Fig. 3 a horizontal section taken on the line, Fig. 2.
The drying chamber A which is heated in the usual way by hot pipes or
flues B led along the floor from a furnace or by other means, is formed with a
number of shallow doorways A' arranged in vertical rows in the front wall A
and closed by sliding doors.

page_text: From each of these doorways horizontal or slightly inclined rails C extend to
the rear of the drying chamber A and on to the rails C are run small bogies or
wheeled trucks D containing the white lead to be dried, the chamber A being
thus filled with the bogies D supported on the rails C in tiers.
For the purpose
of charging and emptying the chamber A through the rows of doorways A' a
vertically movable platform or hoist E is employed extending across the
front A of the chamber A and fitted with turntables E¹, one opposite each
door A¹; and for conveying the bogies D to this platform E from a siding Fin
which they are filled a second hoist G is used and is divided into compartments
by horizontal turntables G₁ on each of which a bogie is carried. The siding F
is a miniature railway or set of rails on to which the bogies 1) are run and filled
from an overhead tank H. From the siding F the bogies D when filled with the
white lead are run one into each compartment of the hoist G which is raised or
lowered to bring the compartments to the level of the rails in the siding F,
and thereafter each in turn to the level of the movable platform E on to which
the bogies are run after being turned round by the turntables G¹ on the hoist G.
The bogies D are run one at a time opposite each doorway A' on one level of the
drying chamber front A², are there turned and run on to the rails C within the
chamber A, and this operation is repeated until the bogies at that level extend
from the rear wall A3 to the doorways A' whereupon the doors are closed and the
platform E raised to the level of the next row of doorways A¹. A series of bogies
are then run in like manner on to the rails C at that level, and the platform
again raised and the charging operation proceeded with at the level of the next
row of rails C and so on until the drying chamber A is fully charged.
When the drying operation is completed the bogies D are drawn out through
each doorway on to the platform E, the withdrawal of the bogies being facili-
tated by the use of winches or chains and chain pulleys on a rotating shaft in
front of the platform; and by having the bogies D coupled by means of auto-
matic couplings fitted to them. From the platform E the bogies D containing
the dried white lead are run into the compartments of the hoist G and raised to
a concrete or other floor A, forming the roof of the drying chamber A. From
this floor A the bogies I) are run through doorways A each into one of a series
of tipping tables or cages I fitted within an enclosed bin J alongside of the
drying chamber A into which the dried white lead is discharged. These tipping
tables I are each composed of an open iron framing on which a bogie D rests and is
held whilst the table which is carried on a shaft or trunnions is tilted over to
empty the bogie. The tilting of the tipping table I is or may be effected by
means of a crank handle or gearing operating a worm shaft acting on a worm
wheel on the axle of the table, or by any other means. The bin Jis connected
by a pipe or flue to a chimney or other means for ensuring a strong inward
draught through the doorway Aº, whilst they are opened to admit the bogies I
to the tipping tables I.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
The improved apparatus for use in drying white lead, constructed and arranged
substantially as described
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents, 62, Saint Vincent Street, Glasgow,
Agent for the Applicants.