Improvements in or relating to Plansifters and other Sieving Mechanism.
Year: 1897

page_text: Date of Application, 1st June, 1897
Complete Specification Left, 5th Aug., 1897-Accepted, 11th Sept., 1897
Improvements in or relating to Plansifters and other Sieving
Mechanism.
L
A communication by GOTTLIER LUTHER, of Brunswick, in the Duchy of Brunswick,
in the Empire of Germany, Milling Engineer.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E. of the Agency for Foreign Patent
Solicitors, 6 Lord Street, Liverpool and 6 Bank Street, Manchester, both in the County
of Lancaster, 118 New Street, Birmingham in the County of Warwick and 322 High
Holborn in the County of Middlesex, Civil Engineer, do hereby declare the nature of
this invention to be as follows:-
เ
This invention has for its object an arrangement of plansifter and other like sieving
apparatus in which the sieve frame is rotated by a crank passing up through the
centre between the two sieves or sets of sieves or through an opening in the centre
and the sieve frame is suspended from a central cross head.
In carrying out my invention for plansifters I form the sieve frame with the two
sets of parallel sieves separated by a short distance and between them I place the
crank, the crank bearing, and the supports of the cross head above.
On a
foundation plate I place the step of a vertical crank shaft also two pillars carrying a
longitudinal girder above which girder in turn carries the top bearing of the crank
shaft. Immediately above the step I place the belt pulley or gearing for driving the
mechanism and above this a balance wheel hereafter described. Above this is a
shallow crank with a very long length of pin running in very long bearing fastened
to the sides of the two plansifter sieve frames. Above the crank is a second balance
wheel and above that again the bearing of the crank sha t. The two balance wheels
have counterbalance weights on them exactly counter lancing the crank, crank
bearings and the sieve frames and sieves. The mode o oiling is peculiar. An oil
chamber is placed on the top of the shaft with a reserv of oil. This oil chamber
has a passage connecting it with a hollow in the hub. f the balance wheel. From
this hollow a pipe delivers the oil into a deep socket or cup of the crank pin bearing
and from a bottom socket below this crank pin bearing the oil is carried to an oil
chamber in the second balance wheel and from there by pipe to the step. From the
step a small oil chamber below has an escape which can be opened as required to
allow the oil to escape. I make the counterbalance equal and at equal distances
from the centre of the crank and consequently from the centre of gravity of the
rotating mechanism. The very long bearing of the crank pin is exactly in the
centre of the plansifter consequently the centre of gravity of the bearing and of
the plansifter coincide. The plansifter can be hung from the upper stationary
cross head by means of canes or suspension rods or even chains fixed below the
bottom of the plansifter frame, but if desired the cross head can carry a pillar
or its ends can be elevated and the suspension bars can connect these elevated

page_text: ends with a point in the horizontal plane of the centre of gravity of the plansifter.
The bed plate is preferably of the form of two T's with their bases united.
Dated this 31st day of May 1897.
-
WM. P. THOMPSON & Co.,
Of 6 Lord Street, Liverpool, Patent Agents for the Applicant.
Improvements in or relating to Plansifters and other Sieving
Mechanism.
A communication by GOTTLIEB LUTHER, of Brunswick, in the Duchy of Brunswick, in
the Empire of Germany, Milling Engineer..
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6 Bank Street, Manchester, both in
the County of Lancaster, 118 New Street, Birmingham in the County of Warwick,
and 322 High Holborn in the County of Middlesex, Civil Engineer, 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 an arrangement of plansifter and other like
sieving apparatus, in which the sieve frame is rotated by a crank passing up through
the centre between the two sieves or sets of sieves or through an opening in the
centre, and the sieve frame is suspended from a central cross head.
The invention is best described by aid of the accompanying drawings of an actual
machine as now supplied by Mr. Luther at his works in Brunswick and his sale-rooms
in Liverpool.
In these
Figure 1 is a longitudinal section through the centre of the machine partly in
simple elevation ;
Figure 2, plan of upper bracket;
Figure 3, horizontal section of centre brackets;
Figure 4, diagrammatic plan of the two sieve frames and crank;
Figure 5, diagrammatic vertical cross section of same.
In these, A A¹ are the two plansifter frames, B crank, C crank-shaft bearing,
D terminal step, E" pulley for driving purposes, E¹ and E counterweight pulleys or
fly-wheels, F F¹ two equal counterweights on these pulleys or fly-wheels counter
weighting the sieves, sieve-frames and their contacts and the crank and its bracket.
These two counterweights are preferably placed equidistant from the centre of
gravity of the rotating mass.
G girder carrying step D, and H girder carrying crank-shaft bearing C. It will
be seen that crank B is long and shallow and is enclosed in split bearing I which is
also long but can be turned out in parts, so as only to touch the crank near the top
and bottom, and say at one intermediate point; by having the bearing nearly the
entire depth of the plansifter sieve frame great steadiness of motion is obtained.
JJ are two pillars supporting girder H. On this girder are suspended, by means
of canes P or their equivalents, tough elastic rods of any suitable kind, the plansifter
frames A A¹. These frames are also secured together by the bracket I and by
preferably distance pieces at the ends also. It is obvious that if requisite longer
suspension could be obtained by attaching upper ends of the canes to brackets rising
high above girder H but attached thereto, or by attaching the lower ends to brackets
attached to the lower parts of the plansifter frames and projecting downward toward

page_text: the floor. Further that by using the upper brackets before mentioned the lower
ends of the canes can be attached to brackets on the plansifter at the horizontal
plane passing through the centre of gravity of the mass. In practice however I
have found the suspension arrangement shown, to answer.
The arrangement for lubricating the mechanism is peculiar, the oil from oil cup K
passes into oil chamber L, thence through the top bearing to cup M and by duct N
to cup O of the central bearing I, thence through similar cups and ducts to the
step D.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, I declare that what I claim is :-
1. In driving apparatus for plansifters, the combination of two plansifters arranged
side by side and a common driving apparatus with its supporting devices placed
between them substantially as described.
2. In an arrangement of plansifter, the combination of two sieve frames, a
stationary framework rising up between them and suspension device from that
frame-work to the plansifter, whereby the whole machine is self contained,
substantially as described.
3. The arrangement of a driving apparatus for a plansifter, in the centre of the
sieve frames and also the oiling devices substantially as described and illustrated.
4. The arrangement of a plansifter taken as an entire piece of machinery
substantially as herein described.