IMPROVEMENTS IN MACHINERY OR APPARATUS FOR SIFTING CEMENT AND OTHER SUBSTANCES
Year: 1884

page_text: We PERCY JOHN NEATE of Medway Iron Works, Rochester in the County of
Kent, Engineer and HENRY WARD of 137 Church Terrace Murston Sittingbourne
in the County of Kont Engineer do hereby declare the nature of our Invention
for "IMPROVEMENTS IN MACHINERY OR APPARATUS FOR SIFTING CEMENT AND
OTHER SUBSTANCES" 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 our Invention is to produce a simple light durable and efficient
apparatus whereby pulverized or partially pulverized material such as Portland
cement ground coprolites and other substances may be sifted and the unduly
coarse portions be separated from the remainder.
For such purposes we employ a suspended sieve in conjunction with means for
causing it to move in a circular or approximately circular path, and devices for
simultaneously imparting to the sieve frequent shocks or vibrations to shake the
contents of the sieve and prevent their clogging its meshes or perforations.
Referring to the accompanying Sheet of Drawings―
Fig. 1 is a longitudinal section of apparatus according to our Invention.
Fig. 2 is a transverse vertical section partly in elevation.
Fig. 3 is a part plan of the apparatus partly in section.
j
Fig. 4 shews in side elevation to an enlarged scale part of the sieve with one of
the devices whereby shocks or vibrations are imparted to the sieve and which
devices will be hereinafter called "knockers."
Fig. 5 is a sectional view at right angles to Fig. 4.
a is a frame from which are suspended pendulous rods b carrying a sieve of any
suitable construction c. d is a vertical shaft arranged in suitable bearings on the
frame a and rotated by the mitre wheel e on the horizontal driving shaft gearing
with the mitre wheel e' on the vertical shaft d. g g¹ are fast and loose pulleys on
the driving shaft f. The vertical shaft d is provided with a crank arm h carrying
a crank pin i secured as shewn in a bearing on the top of the sieve c.
It will be
seen from this arrangement that as the vertical shaft d is rotated the sieve c has
imparted to it motion in a circular or approximately circular path whereby
pulverized material placed upon it will be quickly and efficiently sifted with the
aid of the knockers kk which by their action against the sieve serve to keep its

page_text: meshes or perforations unclogged. These knockers k k are hinged at k¹ to the sides
of the sieve and are provided with spring guard pieces to limit their outward
movement and with abutment pieces m against which they constantly knock or
strike during the circular motion of the sieve c. Each spring guard piece may
advantageously be formed in one piece with the corresponding abutment piece m
and eyes for hinge pin the whole being stamped out of suitable metal such as
spring steel at one operation and subsequently bent to the required shape as
shewn.
The top of the sieve is completely covered except at the higher end where an
opening or openings is or are left for admission of material to be sifted and in order
that the sieve may not be damaged by impact of this material it is furnished with
a deflecting guide plate o and a bottom guard plate p, a space q being left between
these for passage of the material on to the inclined sieve. To render the machine
steady in use, and to prevent undue wear of the bearings the shaft d is provided
with a second crank arm that carries a weight & to counteract the centrifugal
force of the sieve acting on the crank h. A sinall roller t attached to one end of
the sieve c is provided for the purpose of stretching the gauze and can be removed
when the gauze is fixed.
For the purpose of collecting the sifted material we may employ a chamber n
having a bottom n' arranged beneath the sieve c as shewn in Fig. 2 and secured
thereto by nuts and bolts or in any other convenient manner.
For the purpose of collecting the unsifted material or core we may employ a
chamber placed at the end of the sieve c and communicating with it by suitable
passages vand-having-any-convenient outlet in its side ond or bottom.
Having now particularly described and ascertained the nature-of-our-said
Invention and in what manner the same is to be performed we declare that what
we claim is :-
1. The improved sifting machine constructed arranged and operating substantially
as described with reference to and illustrated in the accompanying Drawings.
2. In a machine for sifting cement and other substances the use of a sieve
provided with hinged knockers k spring guard pieces and abutment pieces m
substantially as described and shewn.
3. In a machine for sifting cement and other substances the use of a sieve
furnished with a deflecting guide plate o substantially as and for the purpose
specified.
4. In a machine for sifting cement and other substances the use of a sieve
constructed with a collecting chamber n for sifted material substantially as
described.
5. In a machine for sifting cement and other substances the use of a sieve
constructed with a collecting chamber u for unsifted material or core substantially
as described.
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