Improvements in Agitators for Stuff-chests used in the Manufacture of Paper.
Year: 1890

page_text: Date of Application, 21st Oct., 1890-Accepted, 29th Nov., 1890
Communicated from abroad by MAHLON DICKERSON CURRIER, of No. 8 East
Haverhill Street, Lawrence, Massachusetts, United States of America, Paper
Maker.]
Improvements in Agitators for Stuff-chests used in the Manufacture
of Paper.
I, HENRY HARRIS LAKE, of the firm of Haseltine Iake & Co. Patent Agents,
45 Southampton Buildings, in the County of Middlesex 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 has for its object to provide an agitator for stuff-chests used in paper
making which will be more efficient in keeping the "stuff" in a thorough state of
agitation whereby it is prevented from settling in the bottom of the chest so that the
pump cannot remove it, and to more thoroughly and rapidly mix the ingredients
whereby the different kinds of fibers are kept well mixed, thus producing a more
uniform paper; and in case additional colouring matter is applied during mixing,
causing it to mix with great rapidity.
This invention does away with any bottom plate, thus preventing foul matter from
collecting thereunder, and also, with any top plate, thereby affording less opportunity
for "stuff" to lodge on the agitator itself. The improved agitator also possesses the
advantage of being simple in construction and, by reason of the peculiar shape of the
radial arms or blades of rapidly effecting the discharge with a slight expenditure of
power.
In the accompanying drawings, in which similar letters of reference indicate like
parts;
Figure 1 is a plan view of my improved agitator.
Figure 2 is an elevation of the same.
Figure 3 is a perspective view of one of the blades or arms with a portion of
the hub.
Figure 4 is a reduced elevation of the agitator in position in a stuff-chest shown in
vertical section.
Figure 5 is a cross vertical section on the line x x of Figure 1.
Figure 6 is a similar section on the line y y of Figure 1.
Figure 7 is a similar section on the line zz of Figure 1.
Figure 8 is a cross vertical section of a modified form of blade taken at the point
indicated by line y y of Figure 1.
A represents an ordinary stuff-chest and B is shaft to which rotary motion
is applied by means of suitable mechanism. C is a bub rigidly secured upon said
shaft. DD are radial arms or blades whose inner ends are rigidly secured to said
hub or cast integral therewith. These radial arms or agitating blades are alike, may
be more or less in number and are of the peculiar shape shown in the drawings. At
their inner ends they are of the shape shown in Figure 7, being comparatively slightly
curved, and with wide mouths. At the point D' Figures 1 and 3, the upper edges of
these arms are bent decidedly toward the lower edges, so that the outer ends D¹¹ are
practically tubular although the two edges do not come quite together, such outer
portions being much smaller in diameter than the inner portions. In the modifi-
cation shown in Figure 8 however, the tube is a perfect one, but the operation
of the device when constructed as in Figure 6 is satisfactory. The arms or blades are
preferably curved rearward horizontally as shown.
By means of this construction, the hlades, and especially their lower edges D
catch the "stuff" and discharge it through the tubular outer ends with great rapidity
and with a comparatively slight expenditure of power.

page_text: Having now particularly described and ascertained the nature of this inven
tion and in what manner, the same is to he performed as communicated to me by
my foreign correspondent.I declare that what claim is:
First. In a rotary agitator, the radial arm or blade D having a wide opening or
mouth next its inner ead, and with its upper edge dent.at .D toward its lower edge
whereby its outer portion is substantially tubular and smaller in diameter than its
inner portion, substantially as set forth.
Second. The herein described improved agitator comprising the shaft B, hub C, and
the radial arms or blades D) of substantially the shape shown, and rigidly secured to
or integral with said hub, said arms or blades having substantially broad openings at
their inner ends and being substantially tubular at their outer ends, substantially as
described.
Dated this 21st dow of CI 1006
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.