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Патент USA US3055510

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Sept. 25, 1962
Filed July 22, 1958
3,055,500 '
United States Patent 0 Pce
Paul Aubert-Maguero, 8 Rue Camille Flammarion,
I'erigueux, Dordogue, France
Filed July 22, 1958, Ser. No. 750,198
Claims priority, application France July 24, 1957
4 Claims. (Cl. 209-288)
Patented Sept. 25, 1962
per half thereof. The camway includes two end portions
26 and 27 of gradually increasing and decreasing radius
respectively, as considered in the direction of rotation
of the cage indicated by the arrow 1‘. Each lever 23 is
acted on by a torsion spring 28 in a direction to urge
the related roller 24 against the camway 25. Mounted
for slidable adjustment on ?ange 22 is an annular ?ange
29 carrying projecting studs or pins 30 arranged generally
This invention relates to screening apparatus of the
in radial alignment with the respective levers 23, al
type comprising a cylindrical cage structure rotatable 10 thoughrtheir exact position relative to the levers is ad
about a horizontal axis, wherein the longitudinal bars of
justable as will be later described. The annular ?ange
the cage structure, which bars provide the screening
29 is guided by a plurality of arcuate segmental plates
means, are so arranged that the gaps between adjacent
bars are variable, and the gaps are narrower when the
31 and means are provided, such as bolts 32, for re
leasably urging the plates 31 ‘against the ?ange 22. The
bars are positioned in the lower portion of the cylinder, 15 annular ?ange 29 is formed on its inner periphery with
than when the bars are positioned in the upper part of
gear teeth 33 and the ?ange 22 is formed with a hole 34
the cylinder, \so that any material or articles to be screened
into which the extremity 35 of a suitable key 36 may be
that may have become jammed between an adjacent
inserted, carrying a pinion 37 and on its other end a
pair of bars when such pair was positioned at a lower
handwheel 38. Bars 10 are ?xed on ?ange 22. Opera
position, will drop back into the inner space of the struc 20 tion is as follows:
ture as the said pair of bars spread apart on rising to the
During rotation of the cage or drum structure, as a
upper part of the cylinder.
movable bar 16 is positioned in the top portion of the
This invention has as an object the provision of screen
structure, the roller 24 pivoted on the lever 23 associated
ing apparatus of the type just speci?ed, which will be
with said bar cooperates with the camway 25 so that the
more reliable and e?icient in operation than previously 25 bar is so positioned that the major axis'of the ellipse
known devices, and the invention is especially concerned
comprising the cross section thereof is directed towards
with the construction of the means for varying the gaps
the center of rotation, so that the gap de?ned between
between the screening bars.
said bar and the adjacent ?xed bars 10 is a maximum,
An embodiment of the invention will now be described
and permits ready release of any article lodged between
for purposes of illustration but not of limitation with
said movable bar and an adjacent ?xed bar. As the cage
reference to the accompanying drawings, wherein:
continues to rotate the movable bar 16 approaches the
FIG. '1 is a diagrammatic view illustrating the cross
outlet end 27 of the camway 25 and is caused to rotate
sectional con?guration of the screen bars;
about its pivot 21 due to the fact that the spring 28 ap
FIG. 2 is an end view of an embodiment of the im
plies the associated follower roller 24 against the camway
35 25 which has a decreasing radius. The bar 16 gradually
proved apparatus; and
FIG. 3 is a section on line 3—-3\ of FIG. 2.
As shown in FIG. 1, the longitudinal bars of the
cylindrical cage structure comprise ?xed and movable
bars. A ?xed bar such as 10 has a cross sectional shape
moves away from its radial position and assumes a
transverse position as shown in the lower part of FIG 2,
wherein said bar de?nes with the adjacent ?xed bars a
gap of minimum width corresponding to the desired
which increases in width away from the axis of the
screening dimension. This screening position of the
cylindrical cage. 'In the illustrated construction, the cross
movable bar is positively determined by abutment of
section of bar 10 has a longitudinal axis of symmetry 11
lever 23 against the adjacent pin 30. The movable bar
extending through the cage axis and is de?ned by two
after having travelled over the lower semi-circumference,
sides 12 and 13 diverging away from said cage axis inter
is restored to its retracted position due to the cooperation
connected by a pair of arcs 14 and 15, with the chord 45 of the follower roller with the camway 25.
subtending the are -14 nearer the cage axis being smaller
For altering the adjustment of the screening gap or
than the chord subtending the outer are 15. The arcs 14
interval, the end 35- of the key 36 is inserted into the hole
and 15 may be circumferential arcs each extending over
34 so as to bring the pinion 37 into meshing engagement
about 180°.
with the teeth 33 and thereafter the key is rotated to ro
The movable bars such as 16 are generally elliptical
tate the annular ?ange 29. The relative position between
or oval in cross sectional shape.
each pin 30 and the related lever 23 is thus altered, so
Referring now to FIGS. -2 and 3 an embodiment of
improved screening apparatus according to this invention
that, by the action of spring 28, the abutting position
of lever 23 against the pin 30 is correspondingly altered
is shown comprising ?xed and movable bars of the gen
to provide a new adjusted screening gap.
eral form just described with reference to FIG. 1, al 55 What I claim is:
though it should be understood that the teachings of the
1. A screening apparatus comprising annular support
invention would also be applicable to apparatus of the
ing means rotatably mounted about a horizontal axis,
same general type wherein the bars have different con
?rst longitudinal bars secured on said means having an
?gurations from those shown in FIG. 1. The end of the
elongated cross section directed towards said horizontal
apparatus which is not shown in FIGS. 2‘ and 3 is similar 60 axis and disposed at regularly spaced angular intervals,
to the illustrated end except that it requires no control ap
second longitudinal bars alternating with the ?rst said bars,
paratus. Herein a movable bar .16, of elliptical cross
disposed at regularly spaced angular intervals and pivotal
section, has a pivot 21 projecting axially therefrom for
ly mounted in said annular supporting means about axes
rotatably mounting the bar in a ?ange 22 which de?nes
parallel to said horizontal axis of rotation, a crank rigid
an inner circle through which the articles to be screened
with each of said second longitudinal bars, an annular
are loaded. Secured to the pivot 21 is a crank or lever
23 having a roller 24 journalled on its outer end for
cooperation with a camway 25. The camway is secured
plate adjacent said annular supporting means, co-axial
thereto and including studs disposed at regularly spaced
angular positions, said studs projecting into the path of
on the stationary frame of the apparatus of course by its
said cranks, means for adjusting the angular position of
side not confronting the levers 23 for avoiding inter
said annular plate with respect to said annular support
ference therewith and extends over substantially the up
ing means, cam and spring means co-acti-ng with said
cranks for maintaining the second said bars in a position
wherein their longitudinal axis is substantially directed
towards said horizontal axis of rotation when the second
\said bars are above said horizontal axis, said spring means
being also operative for causing said cranks to contact
the corresponding studs when the second said bars are
below said horizontal axis and when their cranks are
disassociated from said cams.
3. An apparatus as set forth in claim 2, wherein said
‘means for controlling the pivotal motion of said pivotable
elements comprise spring means each associated with a
separate pivotable element and ?xed cam means common
to all of said pivotable elements and stop means limit
ing for each pivotable element the pivotal movement
thereof under the in?uence of the spring means associated
4. An apparatus as set forth in claim 2, wherein said
2. A screening apparatus comprising, at regularly
spaced angular intervals on the surface of a cylinder ro 10 means for controlling the pivotal motion of said pivotable
elements comprise spring means each associated with a
tating about a horizontal axis, a plurality of ?xed ele
separate ‘pivotable element and stationary cam means
ments each having a cross section convergent towards
common to all of said pivotable elements, stop means
said axis, a plurality of pivotable elements on said cylinder
limiting for each pivotable element the pivotal movement
surface which are interposed between said ?xed elements,
thereof under the in?uence of the spring means associated
each of said pivotable elements forming with the adjacent
therewith, and further means for causing the angular shift
?xed elements screening intervals, annular plates disposed
of said stop means in relation to said annular plates there
at the ends of said ?xed and pivotable elements, said an
by causing the intervals between the ?rst said element and
nular plates and ?xed elements being rigidly interconnect
second said elements to be controlled.
ed, and means for rotatably mounting said pivotable
elements on said annular plates about axes parallel to
that of said cylindrical surface; said apparatus further
References Cited in the ?le of this patent
comprising means for pivoting said pivotable elements
in relation to said annular plates ‘whereby said intervals
formed between said pivotable elements and the adjacent
?xed elements have a minimum width when said pivotable
elements are underneath ‘said horizontal axis during the
rotation of said cylinder, and have a maximum width
when said pivotable elements are above said horizontal
axis during said rotation.
Pease ________________ __ Sept. 5, 1916
Germany ______________ __ Feb. 7, 1957
France ________________ __ Feb. 4, 1955
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