Year: 1895

page_text: A communication from FRIEDRICH BRANDSTAEDTER, of Louvain, in the Kingdom
of Belgium, Mill-director..
I, ALFRED JULIUS BOULT, of 323 High Holborn in the County of Middlesex,
Chartered Patent Agent, 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 sieves. The improved sieves according to this invention
differ from the flat sieves hitherto used in the fact that the sifting-gauze is loosely
secured on the frame of the sieve, and that the sieves are cellular.
Various arrangements of the improved cellular flat sieves with transporting
devices are represented in Figs. 1 to 17 of the drawings which relate both to flat
sieves with a circular oscillating movement as well as to those with a rectangular
to-and-fro or reciprocating movement, and to obliquely and horizontally situated
sieves. In the following description the movement should be assumed to be a
circular one.
The novelty of these arrangements lies in the effect which the movement of the
sieve-frames and the material to be sifted on the sieve produces in relation to the
sieve and is characterised by the formation of sifting cells, these cells changing
their form with the movement of the sieve-frame so that the gauze in consequence
of its continual undulating movement cannot be blocked up.
In the accompanying drawings,
Fig. 1 represents a view as seen from above of a flat sieve-frame C with loosely
mounted sifting-gauze:
Fig. 2 shows a section of Fig. 1 on the line y y of the former and
Fig. 3 a section on the line x x of Fig. 1.
The sieve-gauze in consequence of its deflection between the flat rods or transverse
strips or bars a forms the so-called cells.
The formation of these cells
section Fig. 4.
be
may
seen also from the longitudinal
In these figures the flat rods a serve as transporting devices for propelling the
material to be treated, in the well-known manner.
These transporting or propelling devices may be arranged in various ways either
above or below the loosely mounted sifting-gauze and the individual transporting
elements may be given various forms and arrangements.
In Fig. 5 several flat bars are diagrammatically indicated a being the primary or
fundamental type of bar perpendicularly secured to the longitudinal wall of the
sieve-frame as in Fig. 1, a¹ being a bar inclining to the right, a² a bar inclined to
the left and as a bar tapered towards one of the walls.
In Fig. 6 is shown a view as seen from above in a sieve frame and in Fig. 7 a.
section, of a bar which is inclined slopingly towards one of the walls so that by this
means a sliding and transporting action is produced during the rotary motion of
the frame by reason of the said slope. Figs. 8, 9 and 10 show modifications of
his slope.
In Figs. 13 and 14 which are respectively a plan and cross section of a sieve
frame, one of the longitudinal walls of the frame e slopes inwardly, as at g, so that
one-sided sliding-action is also exerted on the material to be treated, in relation
o the smooth vertical longitudinal wall.

page_text: In Fig. 11 the longitudinal wall e is roughened so that the elevations produce a
propelling and transporting-action; in Fig. 12 these effects are produced by
palettes or projections d and in Fig. 15 by a corrugated spring or side wall or strip.
The gauze may be placed in a sieve frame having bars as as shown in the plan of a
frame Fig. 16 and in the cross section Fig. 17, so as to lie in corrugations, the
gauze being secured at its edge only. The action which is produced by the
circularly oscillating movement of the frame causes the material to be treated
to be thrown from one cell into the other; the cavities of the cells continually
alter their form in the manner of the waves of a moving surface of water so
that the material to be treated is transported onwards on the surface of the cells
the meshes being kept from blocking up.
Having now particularly described and ascertained the nature of the said inven-
tion, as communicated to me by my foreign correspondent, and in what manner the
same is to be performed, I declare that what I claim is
;-
1. A flat sieve with loosely mounted sifting-gauze whereby cells are formed
on the sifting-gauze in the sieve-frame in such a manner that the material to
be treated is thrown from one cell into the other by means of transporting-devices
of any description while the cells through the oscillations of the sieve-frames
alter their form in an undulatory manner the blocking of the gauze-meshes being
thus avoided.
2. The arrangement set forth in Claim 1 of a flat sieve with loosely mounted
sifting-gauze so applied to circularly oscillating as well as rectangularly to and fro
reciprocating flat sieve frames as to produce longitudinal or transverse undulations
as shown in Figures 16 and 17.
3. In combination with the arrangement set forth in Claim 1 of a flat sieve
with loosely mounted sifting-gauze the arrangement of transporting elements or
devices arranged above or below the sifting-surface and which either act direct on
the material to be treated by pushing it or produce the forward movement of the
material by striking on the loosely mounted sifting gauze the individual transporting
elements and transporting-devices having a variety of forms.
Dated this 12th day of July 1895.
BOULT & WADE,
Agents for the Applicant.