Improvements connected with Pulp Engines used by Paper Makers.
Year: 1892

page_text: •
Date of Application, 15th Dec., 1892
Complete Specification Left. 15th Sept. 1893-Accepted, 21st Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements connected with Pulp Engines used by Paper Makers.
We THOMAS SMITH TAIT, Paper Maker, and JOHN HOOD, Engineer, both of
Inverurie Mills, Inverurie, Aberdeenshire do hereby declare the nature of this
invention to be as follows:-
The object of this invention is, in an engine provided with guide or fence, to
guide or direct the pulp away from the back of the roll and prevent the pulp from
being carried round with and over the top of the roll.
According to this invention a passage is formed at the back of the roll, and so
placed that the pulp is forced or thrown through this passage into the trough of
the engine and prevented from being carried round with the roll.
In an engine constructed according to this invention the passage through which
the pulp is thrown into the trough may be formed at any point behind the dead
plate.
In existing engines the passage may be formed by raising the backfall and
giving it a suitable shape by means of a block of wood, iron or cement and fixing
to the cover or sides of engine a guide or docter extending the whole width of the
roll so as to form a passage of a suitable shape between the raised backfall and
guide through which the pulp is thrown or directed away from the roll and into the
trough of the engine.
Dated this 15th day of Dosomber 1909
•
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said T. S. Tait and J. Hood.
COMPLETE SPECIFICATION.
Improvements connected with Pulp Engines used by Paper Makers.
We THOMAS SMITH TAIT, Paper Maker and JOHN HOOD, Engineer both of
Inverurie Mills, Inverurie Aberdeenshire, 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 :-
The object of this invention is in an engine provided with a guide or fence to guide
or direct the pulp away from the back of the roll and prevent the pulp from being
carried round with and over the top of the roll.
According to this invention a passage is formed at the back of the roll and so
placed that the pulp is forced or thrown through this passage into the trough of the
engine and prevented from being carried round with the roll.
In an engine constructed according to this invention the passage through which
the pulp is thrown into the trough may be formed at any point behind the dead
plate.
In existing engines the passage may be formed by raising the back fall and
giving it a suitable shape by means of a block of wood, iron or cement fixing to the
cover or sides of the engine a guide or docter extending the whole width of the
roll so as to form a passage of a suitable shape between the raised backfall and
guide through which the pulp is thrown or directed away from the roll and into the
trough of the engine.
The annexed drawings show our invention.
Figure 1 is a section on the line a, b, of Figure 2 which is a plan of the beater

page_text: engine Figure 3 being a part section indicating the protection of the shaft by the
guard.
A is the trough, B the partition therein, C is the shaft and D the beater roll,
E is the shield with a curved guide F from which is bung by hinges a flap G.
H is the uprising incline of the bottom to the dead plate I the bottom then being
curved at J to the neck K from which is the descent plate or backfall L. This
may be at any angle such as is indicated by full lines, the dotted lines shewing the
height at which the backfall of an existing beater engine is carried; the additional
height can be made to form the narrow passage by building up on the existing one
by a lump such as that shown by the curved dotted line N. M is the guard in the
open return part of the trough A and under the shaft C.
The space between the top edge of the backfall L and of shield E and guide F
is of such shape and narrow but of the full width of the roll E to prevent the
"stuff" falling back between the roll E. curved plate J or of being carried round
by the roll E whereby the stuff has a better travel and circulation than usual and
passes oftener and more regularly between the roll and the plate.
By this invention the stuff is more freely delivered behind the roll and stands
higher in the trough than in ordinary beater engines and the guard not only
protects the shaft but enables the stuff to move uniformly along the return side of
the trough.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. As an improvement connected with pulp engines used by paper makers the
combination of the several features before referred to and the arrangement thereof
as shown in the annexed drawings for the purpose described.
2. Utilizing the centrifugal force imparted to the "stuff" by the roll E by its
passage through a narrow opening into the trough this serving together with the
shape of the backfall and guide to produce a better circulation of the stuff and an
increase of action by the roll upon the stuff as set forth.
3. In a paper pulp beater engine forming the orifice and arranging the back edge
of the shield close to the rolls periphery for the purpose of utilizing the
centrifugal action of the roll to force the stuff into the back part of the trough as
described.
11 1
1009
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said T. S. Tait & J. Hood.