An Improvement in or relating to Sieve Changing Arrangements in Purifiers, Vibrating Sieves, Screens, and the like.
Year: 1899

page_text: Date of Application, 4th Apr., 1899
Complete Specification Left, 2nd Feb., 1900-Accepted, 17th Mar., 1900
An Improvement in or relating to Sieve Changing Arrangements in
Purifiers, Vibrating Sieves, Screens, and the like.
THOMAS WILLIAM FREEMAN, Miller, 13, West Bar, Banbury, Oxon, and the
BANBURY CO-OPERATIVE INDUSTRIAL SOCIETY LIMITED, Corn Millers, &c., 47,
Broad Street, Banbury, Oxon, do hereby declare the nature of this invention to
be as follows:-
Our invention relates to improvements for changing sieves, in connection with
or without an adjustable platform, so constructed and arranged that the sieves
or screens can be interchanged and the working surface of the sieves reduced or
extended as required while the machine is in motion. Hitherto no interchange
of sieves could be effected or the surface of the sieves reduced or expanded while
the machine is working, but with our arrangement any or all the sieves can be
taken out and a coarser or finer inserted as required to suit its purpose without
affecting the current of air or the working of the machine.
To carry our invention into practice, we first make the square frame for the
sieves to be worked in the said frame averages in length & breadth & is so con-
structed & arranged in sections that two, four or more sieves may be used if
required, the said sections are made by pieces of wood or metal fixed across the
frame equal or unequal distances apart as may be required to suit its purpose,
between the said cross pieces & on the sides of frame we cut slots longitudinal
from one section to another, the cross-pieces are groved both sides so that imme-
diately the sieves are put through the frame they slide on the sides of the cross
pieces groved for that purpose & at once hold the sieve in its proper position, the
sieves are made separately & are interchanged through the slots at the sides of
the frame in the manner of drawers, the reducing & expanding platform is con-
structed & arranged by an adjustable board which is arranged on the top of the
sieve & on each side, & is adjusted by the aid of two thumb screws, the ends of the
boards work in a grove which is arranged at each end of the frame for that pur-
pose so it will at once be seen that if the boards are brought nearer to each other
or screwed further apart will, reduce or expand the sieve surface as required, as the
boards fit firmly down to sieves.
This is essentially a discription of our invention but do not bind ourselves to
any particular or exact shape of sieve or adjustable board for reducing or expand-
ing as it may be necessary to vary the shape of sieve or board to suit the purpose
of the various materials under treatment.
THOMAS WILLIAM FREEMAN,
13, West Bar, Banbury,
HENRY JAMES COOKE,
Secretary for the Society.

page_text: An Improvement in or relating to Sieve Changing Arrangements in
Purifiers, Vibrating Sieves, Screens, and the like.
We, THOMAS WILLIAM FREEMAN, Miller, 13, West Bar, Banbury, Oxon, and
"the BANBURY CO-OPERATIVE INDUSTRIAL SOCIETY, LIMITED," 47, Broad Street,
Banbury, Oxon, 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 an improved construction of vibrating sieves or screens,
more particularly such as are used in middlings purifiers. According to our
invention we so arrange the several sieves of the frame that they can be readily
removed in a lateral direction from the frame and replaced without requiring
the motion of the sieve to be stopped for the purpose. Furthermore we provide
on each side of the sieve an adjustable gauge plate which plates can be simul-
taneously shifted farther apart or nearer together in such manner as to present a
greater or smaller amount of sieve surface for the middlings or other material to
pass over, according as may be required.
We will describe our said improvements with reference to the accompanying
drawings in which Fig. 1 shews a plan of a sieve constructed according to this
invention, Fig. 2 is a part side view and part longitudinal section, and Fig. 3
shews a cross section.
The sieve frame, A. is here shewn containing four sieves B1, B2, B3, B4, it may
however contain any greater or less number.
The frame A has three transverse bars C extending across it either at equal or
unequal distances apart according as the sieves are to be of the same or different
lengths. These bars are formed with rebates at their edges on to which fit the
sieves B1 B2 &c., these being adapted to be slid laterally into position through
slots D in the side of the frame A. The sieves are held in position by the longi-
tudinal cover plates E fixed over the bars Con each side; these cover plates may
either be of uniform width, or they may be made of varying width
as shewn, SO that the widths of the successive sieves are thereby
made to gradually decrease in size from the one end to the other.
Upon the cover plates E are fitted sliding gauge plates F, the inner edges
of which are formed with upward and downward projecting ledges F, and which
carry threaded eyes G through which are screwed right and left handed screw
spindles H, the ends of which pass through the sides of the sieve frame and are
provided with hand wheels H', so that by turning these in one direction or the
other the plates E are either advanced towards each other or made to recede from
each other, according as it may be desired to decrease or increase the working
surface of the several sieves, the ledges F being made to fit down closely against
the sieve surfaces. In order to hold the plates F down against the sieve surfaces
the one end thereof is made to fit into a groove I in the one end walk of the sieve
frame while the other end has dovetail downward projections F2 sliding in a dove-
tail slot J in that end of the sieve frame.
The gauge plates Fare shewn of varying width, corresponding to the cover
plates E, so as to render the exposed surfaces of the successive sieves of corre-
spondingly varied widths. The plates F may however also be made of uniform
width throughout.
It will be seen from the above description that the advantage is gained with
the improved construction that not only can the sieves be readily changed, but

page_text: also, the gauge plates be adjusted for widening or narrowing the sieve surfaces,
without necessarily stopping the machine for that purpose.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what
we claim is:-
1. A vibrating sieve or screen apparatus wherein two or more separate sieves
are so arranged within the sieve frame, that they can be slid laterally in and out
of the frame through slotted openings in the side or sides of the latter, so as
to be readily removed and replaced from the outside without necessarily stopping
the machine, substantially as described.
2. In a vibrating sieve or screen the combination of a frame such as A having
transverse bars C with rebated edges, and slotted openings D in its sides, and
sieves such as B1 B2 adapted to be slid in and out through the openings D and to
rest on the transverse bars C, substantially as described.
3. A vibrating sieve or screen apparatus wherein there are combined with two
or more screens, two lateral gauge plates such as F so arranged and actuated as
to be slid to a greater or a less extent over the sieve surfaces in order to reduce
or increase the operative area thereof, the adjustment being effectd by right and
left handed screw spindles or other suitable devices that can be operated from the
outside of the sieve frame, substantially as described.
4. In a vibrating sieve or screen apparatus, the combination with a sieve frame
such as A of sieves such as B 32 that can be slid in position through slotted
openings in the frame, and adjustable gauge plates such as F that can be slid
more or less over the sieve surfaces for increasing or decreasing the operative area
thereof, substantially as described.
Dated this 2nd day of Wahmam. 1000
ABEL & IMRAY,
Agents for the Applicants.