Year: 1886

page_text: We, CALVIN RUSSELL, and PATRICK HENRY CRAGIN, both of Penn Yan, County
of Yates, and State of New York, United States of America, do hereby declare the
nature of our invention and in what manner the same is to be performed, to be
particularly described and ascertained-in and by the following statement :-
Our invention relates to the class of paper pulp screens which are arranged over
a liquid-containing vat with an air space between the liquid and the grate, by the
intermittent displacement of the air in which space, a pumping action is produced
which serves to keep the openings of the screen clear, and facilitates the passage of
the pulp through the screen.
Our invention has special reference to the devices employed for producing the
aforesaid pumping action, and it consists in a novel organization of a pumping
apparatus which is simple and inexpensive in construction, efficient, and com-
paratively noiseless in its operation, and the power required for operating which
is reduced to a minimum.
In the accompanying drawing
Figure 1 is a side elevation of a paper pulp screening apparatus embodying
our invention with a portion of the front broken away to show the internal
arrangements.
Figure 2 is a top plan view of the same with portions of the screen broken away
to illustrate the subjacent pumping apparatus.
Figure 3 is an enlarged vertical longitudinal section of a section of the aforesaid
screening apparatus taken on line y y Figure 2.
Figure 4 is a vertical transverse section on line xx Figure 3; and
Figure 5 is a transverse section of a modification of our improved pumping
apparatus.
Similar letters of reference indicate corresponding parts.
▼ represents the pulp-vat, and C the paper pulp screen which is arranged
horizontally across the upper part of the vat and fitted air-tight to the sides
thereof,
T denotes a trough, which by spouts T¹ delivers the diluted pulp upon the
screen C.
By means of a dam D at the discharge end of the vat V, the liquid in said vat
is maintained at a uniformn level a short distance below the screen, and thus an air
space is formed immediately underneath the screen, which air space is water sealed
to prevent ingress of air except through the slots of the screen.
Immediately under the surface of the liquid in the vat, we submerge the chief
element of our improved pumping apparatus, consisting of the pumping bars AA
arranged horizontally side by side and submerged in the liquid of the vat as
aforesaid. These pumping bars we arrange to move laterally toward and from
each other in any suitable manner,
The object of said arrangement is to alternately open and close the spaces
between the bars.

page_text: In opening said spaces a vacuum is formed between each pair of bars, and
thereby a downward suction through the screen is produced. This suction
facilitates the escape of the diluted pulp through the screen.
In closing the spaces between the pumping bars, the liquid or diluted pulp which
bas entered said spaces is expelled downward, and the air is forced upward; the
upward pressure of the air through the screen serves to clear the interstices of the
screen, and thus facilitates the screening of the diluted pulp.
In practice we find that we render the pulping bars A A more efficient in their
operation by forming them concave on the tops and sides as shown in the drawing,
and placing between the movable bars A A a stationary bar B likewise concave on
the top and on the sides adjacent to the bars A A; the vat V we also provide with
concaved sides.
The bars A A are mounted upon rock-shafts a a which are extended horizontally
across the vat, and each has one of its ends extending through the side of the vab
and through a stuffing box, and has a crank or rock-arm b attached to it at the
exterior of the vat.
A reciprocating bar c connected with the successive rock arms bb bb operates
the rock-arms in common or synchronously; and thereby the pumping bars A A
are oscillated on their longitudinal axes.
°
In the oscillation of the bars, the pumping action is produced by the alternate
opening and closing at the top and bottom edges of the bars of the pockets formed
by the concaved sides of the bars. It will be observed that, by placing the axis of
the bars below the centre thereof, as shown in Figure 3 of the drawing, a much
greater movement is obtained at the upper portions of the bars than at the lower
portions of the same, and this increases the efficiency of the pumping bars A, A.
If desired, the stationary bar B may be dispensed with as represented in
Figure 5 of the drawing.
Below the described pumping bars is a false-bottom d, which is provided with
discharge openings e e central under the bars A. A, and this false-bottom constitutes
the bottom of the pump case.
In order to permit of disconnecting one set of pumping bars from the actuating
mechanism without interfering with the operation of the remainder of the pumping
bars, we detachably connect the rock-arms b b with the reciprocating rod c by
means of suitable clutches or latches pivotted on the rod c and provided with
notches engaging the wrist-pins of the rock-arms.
By raising said latches the rock-arms become disconnected from the reciprocating
rod c.
It will be observed that, by pivotting the pumping bars A A in the manner
described, we reduce the strain to a minimum and render the apparatus com-
paratively noiseless, and the superior efficiency of the apparatus has been proved
by practical tests.
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 :-
First. The combination, with a paper pulp screen and subjacent pulp vat, of
pumping bars arranged horizontally side by side and movable laterally immediately
beneath the surface of the liquid in the said pulp vat, substantially as, and for the
purpose, specified.
Second. The combination, with a paper pulp screen and subjacent pulp vat, of
pumping bars arranged horizontally and longitudinally side by side and oscillatory
on their longitudinal axes, and immersed immediately beneath the surface of the
liquid in the pulp vat, substantially as set forth.
Third. The combination, with a paper pulp screen and subjacent pulp vat, of
pumping bars arranged horizontally side by side and movable toward and from
each other immediately beneath the surface of the liquid in said vat and concaved
on their adjacent sides, substantially as described and shown.

page_text: Fourth. The combination, with a paper pulp screen and subjacent pulp vat, of
pumping bars arranged horizontally side by side and movable toward and from
cach other immediately beneath the surface of the liquid in the vat, and concaved
on their upper sides, substantially as described and shown.
Fifth. The combination, with a paper pulp screen and subjacent pulp vat, of
pumping bars arranged horizontally side by side and movable toward and from
each other immediately beneath the surface of the liquid in the vat, and concaved
on their adjacent sides and on their upper sides, substantially as described and
shown.
Sixth. The combination, with a paper pulp screen and subjacent pulp vat, of
pumping bars arranged horizontally side by side and movable toward and from
each other immediately beneath the surface of the liquid in the vat, and a
horizontal bar arranged stationary between the movable bars, substantially as
set forth.
Seventh. The combination, with a paper pulp screen and subjacent pulp vat,
of pumping bars arranged horizontally side by side and movable toward and from
each other immediately beneath the surface of the liquid in the vat and concaved
on their sides, and a horizontal bar arranged stationary between the movable bars
and concaved on the sides adjacent to said bars, substantially as described and
shown.
Eighth. In combination with the paper pulp screen, the subjacent pulp vat
provided with concave sides, pumping bars arranged horizontally between said
sides and in one and the same plane, and movable laterally immediately beneath
the liquid in the vat, and concaved on their sides, substantially as set forth and
shown.
Ninth. The combination, with the paper pulp screen and subjacent pulp vat, of
pumping bars arranged horizontally side by side and movable laterally immediately
beneath the surface of the liquid in the tank, and a false-bottom under the pumping
bars provided with discharge openings central under said bars, substantially as
described and shown.
Tenth. In combination with the paper pulp screen and subjacent pulp vat, a
pumping apparatus submerged in tho liquid in the vat, and comprising a series of
bars arranged horizontally side by side and oscillating on their longitudinal axes,
and concaved on their sides, stationary horizontal bars between the oscillating bars
and concaved on their sides, and a false bottom under said bars provided with
discharge openings central under the oscillatory bars, substantially as described
and shown.
Eleventh. In combination with the paper pulp screen and subjacent pulp vat,
a series of pumping bars arranged horizontally side by side immediately beneath
the surface of the liquid in the vat, rock-shafts attached to the bottom of the
respective puinp-bars, rock-arms attached to the rock-shafts and a reciprocating bar
connected with, and operating in common, the aforesaid rock-arms, substantially as
described and shown.
Twelfth. In combination with two or more screens and vats each provided with
a set of pumping bars as described and rock-shafts and rock-arms for operating said
pumping bars, a reciprocating bar extended across the successive rock-arms, and
clutches or latches detachably connecting the rock-arms with the reciprocating bar,
substantially as, and for the purpose, set forth.
HASELTINE, LAKE & Co.,
Agents for the Applicants.