Improvements in Gyrating Sieves or Bolting Machines.
Year: 1897

page_text: Date of Application, 21st Dec., 1897-Accepted, 19th Feb., 1898
COMPLETE SPECIFICATION.
Improvements in Gyrating Sieves or Bolting Machines.
I, AUGUSTUS WOLF, of Chambersburg in the County of Franklin, State of
Pennsylvania, one of the United States of America, Manufacturer of Flour Mill
Machinery, 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 my invention is to provide means for steadily driving the sieve casing
of a gyrating sieve or bolting machine and to permit ready access to any of the sieves
without disturbing the others.
In the accompanying drawings :-
:-
Figure 1 is a side view, partly in section, of a gyrating sieve or bolting machine
constructed in accordance with my invention ;
-
Figure 2 is an end view of the same partly in section ;
Figure 3 is a horizontal section of part of the machine the section being taken on
the line 3-3, Figure 1;
the line 4-4,
Figures 5 and 6, are respectively a vertical section and a plan of a special form of
crank pin connection for driving the sieve casing.
Figure 4 is a transverse section of the sieve casing on
Figure 3, and
A represents the sieve casing of that form of bolting apparatus in which the sieve.
casing or bolting chest has a gyrating movement, this casing being mounted upon
four rods B located two upon each side of the casing at points substantially equidistant'
from the centre of the same.
The lower ends of these rods B are conical and rest in conical sockets a secured to
a suitable bed plate D upon the floor of the room or apartment containing the machine,
the upper end of each rod being socketed for the reception of the lower end of a set
screw 6 which is carried by a projecting lug 61 on a plate b² secured to the bottom of
the casing A, the character of the sockets a, in respect to the lower ends of the
rods B, and the character of the sockets in said rods in respect to the set screw b
being such that free tipping or tilting movement of said rods in the sockets a and like
free tipping or tilting movement of the set screws b in the sockets of the rods B is.
permitted.
A sieve casing supported in this way can be operated with a minimum amount. of
power and without causing that vibration of the building which is an objection to.
gyrating sieve casings supported from above in the usual way.
Projecting from each side of the casing A is a bracket plate c with depending
lugs c¹ which carry set screws c² upon which is pivotally mounted a ring d having set
screws d' in a plane at right angles to that of the set screws c² and upon said set
screws d¹ is pivotally mounted a bearing box or block d² which receives a crank pin f
rigidly secured to and projecting upwardly from a disc F, the box d² being preferably
split and provided with a tightening bolt as shewn by dotted lines in Figure 3, so
that it can, be caused to fit snugly to the crank pin f.
The discs Fon opposite sides of the casing A are carried by vertical shafts G and
are connected together by a belt g so as to be caused to rotate in unison, power
being applied to each of the upright shafts G from a transverse shaft H, through the
medium of bevel wheels h h¹, as shewn in Figure 2. This positive driving of each

page_text: shaft, in combination with the belt g connecting together the discs F insures the
t-g
rotation of the said discs at the desired uniform speed. As the discs are rotated,
the casing A is caused to move in a horizontal plane and in a circular path corresponding
with that of the crank pins f, the rods B providing the necessary vertical support
for the casing and the crank pins governing the longitudinal and lateral movements
of said casing.
The universally flexible mounting provided for the crank pin boxes d² prevents
any binding of the crank pins in the said boxes, and therefore prevents heating of
either of the parts which would be occasioned by such binding, causing a settling of
part of the supporting or driving structure, and so disturb the proper alignment due
thereto..
The sieve structure comprises the sieves i, i¹, 2, 3 and 4, the three upper
sieves i, ¹, 2, and the bottom sieve it being inclined outwardly and downwardly from
the centre of the machine, and the intermediate sieve ³ being inclined inwardly and
downwardly towards the centre of the machine.
The material from the central hopper k is delivered onto the head or upper ends
of each of the top sieves i and those portions of the material which pass through the
sieves are received by the second sieves , part of such material falling directly
upon the sieves i¹ and part being directed onto the said lower sieves by directing
boards m arranged beneath the lower portions of the sieves i, and extending
partway under the same in an inclined direction the reverse to that of the sieves i.
In the same way, the material which passes through the sieves i¹ is directed onto
the sieves 2, and that which passes through the sieve i² is directed onto a collecting
table n which guides it to an ontlet opening p or p¹ situated centrally on the sieve
casing, there being a set of sieves on each side of the casing, as shewn in Figure 3.
The tailings from the sieves i¹ are delivered into a chamber s at the end of the
machine, but those from the sieve 12 are delivered onto the sieve i³, the material
which passes through the later being caught by a collecting table n¹ which likewise
guides it to one of the openings p or p¹.
The tailings from the sieve 23 of each set of sieves are directed onto the bottom
sieve and the material which passes through the latter is received by the inclined
bottom 2 of the casing and directed to the outlet n³, the tailings from the sieve it
escaping into the chamber & from which they are discharged through the opening 8¹.
The openings p p may be provided with suitable valves so that either can be cut
off and the other used as the discharge.
By using the short directing boards m the size of the machine is much reduced as
compared with one having directing boards running the full length, owing to the
less vertical space occupied by the said short boards.
Each of the sieves i¹ 2 3 and it has end slats or ribs, adapted to slide in guides in
strips within the casing A so that the said sieves can be introduced and withdrawn
from the casing, like drawers, and either of the sieves can thus be readily with-
drawn without disturbing the others, hence each sieve is readily accessible for cleaning
or repairs, the top sieve i being accessible from the top of the machine.
.
At the lowest portion of each of the collecting tables n n¹ is a block or weight w
which is carried by a cord w extending to the opposite ends of the table, these
weights or blocks, as the sieve casing is gyrated, moving about on the lowest portions
of the tables, and serving to aid in directing the material from said tables to the
outlets p p¹.
When it is not desired to employ the universally pivoted connection as a means
of transmitting the motion of the crank pins f to the sieve boxes, I adopt a specially
constructed crank pin and crank pin connection which will permit of the employ-
ment of crank pin boxes lined with antifriction metal and will provide for the ready
lubrication of the crank pin. This construction is shown in Figures 5 and 6, on
reference to which it will be observed that the crank pin f has a head f¹ enlarged
in diameter and that the box for the reception of this enlarged head is formed partly
in the frame A¹ on which the sieve boxes are intended to be mounted, and partly in
the cap A² which is secured to the said frame by means of bolts and nuts, both the

page_text: frame and cap having a lining x of Babbitt metal or other antifriction metal sup-
ported upon shoulders projecting inwardly below the enlarged head f¹ of the crank
pin, both the frame A¹, and the cap A2 likewise projecting above the top of said
enlarged head f' so as to form a chamber for receiving oil or other lubricant.
Having now particularly described and ascertained the nature of my said inven-
tion and the manner in which the same is to be performed I declare that what I
claim is:-
1st. A gyrating sieve or bolting machine having a driving device consisting of
discs with crank pins engaging with bearings on the sieve box, an endless belt
running from one driving disc to the other, and a countershaft and bevel gears pro-
viding a driving connection between the shafts of the said discs substantially as
hereinbefore described.
2nd. A gyrating sieve or bolting machine having sieve frames in the form of
drawers removable sideways from each side of the sieve casing, and discharging
material into a central delivery passage, substantially as hereinbefore described.
3rd. The combination of the sieve box or casing and the rotating discs having
crank pins with universally pivoted connections whereby the movement of the said
crank pins is transmitted to the sieve box, or casing, substantially as herein before
described.
4th. A gyrating sieve or bolting machine, having a crank pin connection com-
prising a pin with enlarged head, and a bearing box for said enlarged head formed
partly in a frame which carries the sieve box or casing, and partly in a detachable
cap, both parts of the bearing box being lined with antifriction metal, substantially
as herein before described.
5th. The combination of the crank pin having an enlarged head, and the divided
bearing box therefor having a portion extending above the top of the enlarged head
of the crank pin so as to provide a chamber for the reception of lubricant, substan-
tially as herein before described.