Year: 1887

page_text: I, WILLIAM WALLACE DRODOT JEFFERS of Ticonderoga, in the County of Essex,
and State of New York, United States of America, gentleman, 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 certain improvements in pulp engines, for refining paper
stock of all grades and qualities, and it has for its objects to provide for accurately
adjusting the grinding surfaces of the same, so as to draw the fibres out gradually
and properly finish the stock; and also to provide for constructing the grinding
parts or "plug" in sections, which are secured together upon the shaft and within
the cone or shell knives as more fully hereinafter specified.
These objects I attain by the means illustrated in the accompanying drawings, in
which,
Figure 1, represents a view, partly in side elevation and partly in longitudinal
vertical section, of my improved pulp engine.
Figure 2, represents a longitudinal vertical sectional view thereof.
Figure 3, a detached plan view of a section of the rotary grinder.
Figure 4, a sectional view of another section of the grinder.
Figure 5, a transverse vertical sectional view of the machine taken on the line x, t,
of figure 1, and
Figure 6, represents a longitudinal vertical sectional view of a portion of the
adjusting mechanism.
Referring to the drawings, the letter A indicates the shell of the engine, which is
constructed preferably of cast iron or steel, and is conoidal in form having flanges at
each end for the attachment of the respective heads, which are similarly flanged and
secured to the flanges of the shell by means of suitable bolts.
The larger head B of the shell is provided with an annular groove C on its outer
face, in which sets the segmental flange D), of a semi-tubular extension E, which
forms a support for the adjusting devices of the internal rotary grinder F. The head
is also provided with a central boss G, having a packing and gland H, through which
passes one end of a central shaft I, to which the rotary grinder is attached. The
said end of the shaft extends outwards beyond the gland, which forms one of its

page_text: bearings, and is provided with a series of annular grooves K, the said end being
embraced by the two parts of a box L, which are clamped and bolted securely
around the shaft, the box being provided with a similarly arranged packing or
bushing M having grooves N, in which the grooved portion of the shaft turns
freely, the packing being provided with annular ribs P on the outside engaging
the grooves R on the inside of the box whereby it is held in place.
The extension E is provided with longitudinal ways S at each side, in which are
adapted to slide the lateral flanges of the box L, so as to guide the box longitudinally
as it is advanced or retracted, by the adjusting mechanism. The said mechanism
consists of a leading screw T passing through a threaded aperture in the lug U
depending from the lower part of the box. The said screw has a plain shank, working
in a bearing at the end of the extension E, and having a fixed collar working
against said bearing so as to hold the screw longitudinally. The outer end of
said screw has locked to it a worm wheel V, the periphery of which intergears
with a worm on the shaft W, which is provided with a hand wheel X by means of
which it may be operated to move the revolving part, or cone of the grinder back
and forth accurately, so as to adjust it with respect to the grinding surfaces of the
shell. The worm shaft has its bearings in a divided box Y, which at one side has a
screw shaft Z provided with a hand wheel by means of which the worm may be
clamped, to lock the parts when adjusted. The central shaft I also extends through
a boss A¹ at the center of the smaller head of the machine and through a packed
gland B³, and a bearing box (having a bushing or packing D¹. The said box is
constructed in two parts, bolted together and is secured to a longitudinal extension E¹
forming part of the engine. The letters G, H, indicate the supports upon which
the engine is mounted, which are bolted or otherwise fastened to a suitable base.
The grinding cone is made of detachable sections, which are longitudinal conic
sections, having curved parallel diametrically opposed bearings K¹ which are
perforated for the bolts L', by which they are secured to the seats on the arms M
extending from the radial arms N¹ on the hub P'. The axle or shaft upon which the
hub P¹ fits is slightly larger than the part of the shaft upon which the hub R¹ fits, so
that the first can be slipped on over the smaller portion by shrinkage, and the
hub R' afterwards similarly fitted and shrunk on, so as to hold the parts, the edges,
bearings and adjoining parts being planed centered and adjusted, so as to be inter-
changeable and readily fitted to each other to provide for ready repairs.
The hub R' is provided with seats to which the conic sections of the "plug" or
grinder are bolted and seated, in a similar manner to the connections at the large
end of the "plug" or grinder.
The section T is composed of one piece, and fits, upon shoulders U₁ of the section
before mentioned. The said section is confined in place by means of an annulus or
ring V which is shrunk on the shaft to a portion less in diameter than that carrying
the hubs before mentioned, thus confining the sections of the grinder in place. The
surface of the grinder is provided with parallel longitudinal teeth or ribs which
co-operate with similar teeth on confined, removable sections secured in the shell
as more fully herein after specified.
The said removable sections are curved to the inner contour of the shell, which
is provided with annular seats W' at intervals, into which the annular ribs of the
juxtaposed flanged heads of the removable sections fit and are held. When the heads
are applied and secured to the flanged ends of the shell, they confine the parts within
the shell, in the proper working position.
The letter Z indicates the induction opening of the shell into which the material
is fed, and A² the eduction opening controlled by suitable valves through which the
pulped material is discharged.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is ;
1st. The combination with the shaft carrying the conical grinder, of its annularly

page_text: grooved end, the movable box and bushing, the ways on the extension secured to the
head, the leading screw and worm screw, and the operating worm whereby the screw
may be advanced or retracted, substantially as specified.
2nd. The combination with the central shaft having successively different
diameters of the grinder sections, having varying diameters for the reception of the
hubs of the sections of said grinding cone substantially as specified.
3rd. The combination with the conoidal shell, of the sections adapted to fit
therein, in annular seats provided for the purpose, the said sections being provided
with flanges to rest in said seats and with grinding teeth or ribs, substantially as
specified.
Dated this 11th day of November 1887