Improvements in or relating to Sifting Apparatus.
Year: 1897

page_text: Date of Application, 8th Dec., 1897-Accepted, 8th Jan., 1898
Improvements in or relating to Sifting Apparatus.
We, GEORGE SAMUEL BAKER, of 58 City Road, in the County of Middlesex,
Engineer, and WILLIAM KING BAKER, of 58 City Road, in the County of Middlesex,
Engineer, 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 sifting-apparatus of the type in which a sieve is pro-
vided internally with a rocker operated mechanically to move the material to be
sifted over the interior of the sieve in such a manner as to cause it to issue through
the perforations thereof, its object being to simplify and cheapen the construction
of such apparatus.
In the accompanying drawings
Figure 1 is a longitudinal central section of an improved sifting apparatus
according to this invention, which is shown as supported by the edges of a baker's
trough into which the sifted material is to fall;
Figure 2 is a transverse section on the line 2–2 of Figure 1; and
Figure 3 is a plan of the apparatus..
Like letters indicate like parts throughout the drawings.
A is a rectangular frame open at top and bottom, and to the lower edges of which
the sieve is secured; this latter consists of a curved sheet B of perforated metal
or wire gauze soldered or brazed along its edges to a metal frame comprising
approximately semi-circular plates B₁ with flanges B2 to which the edges of the
curved sheet B are secured, and with other flanges B3 through which screws B₁
are passed to secure the sieve to the frame A in such a manner that it is readily
attachable or detachable.
.
In bearings A secured upon the exterior of the frame A a shaft C is journalled.
Arms D secured upon opposite ends of the shaft C within the frame A are con-
nected at their lower ends by a transverse frame composed of bars EE which are
situated in close proximity to the interior surface of the perforated sheet B. The
latter and the bars E E¹ are curved in circular ares, the centres of which are
situated on the axis of the shaft C, so that when that shaft is oscillated by means
hereinafter to be described it will move the bars E E backwards and forwards over
the adjacent interior surface of the sieve in such a manner as to agitate the con-
tents of the apparatus and cause them to be sifted through the perforations of the
sheet B into, for example, the trough X below it.
To prevent any tendency of the curved sieve to yield during the operation of
the apparatus it can be strengthened by one or more supporting bars A+ extending
across the underside of the sieve in close contact with it and attached at the ends
to the side flanges thereof.
The arms D are made to be adjustable radially with regard to the shaft C in
order that the proximity of the bars E E¹ to the interior surface of the curved

page_text: sheet B may be varied as desired. In the example illustrated the upper ends of
the arms D have attached to each of them an open rectangular frame constituted
by the jaw D¹ and a cross bar D³ normally secured to the jaws so as to close the
opening thereof. The jaws D'¹ fit and are adapted to slide upon blocks C¹ (Fig. 2)
keyed or otherwise secured upon the ends of the shaft C; in the frame D¹ D³ is
secured a screw F which is prevented from having motion relatively to the frame
in the direction of its own axis by a collar F¹ and is provided with a square or
other head F2 to enable it to be readily turned by a spanner or the like. These
screws F pass through the blocks C¹ which are screw-threaded to engage with them,
so that by rotating the screws in the frames which carry them, they will move end-
wise in the blocks C¹ and carry the arms D with them towards or away from the
curved perforated sheet B: Upon the exterior of the frame A is mounted
mechanism for imparting the desired reciprocatory angular movement to the
shaft C and the frame E E¹ carried by it; this mechanism comprises a shaft G
carried in brackets A³ secured to the frame A and having at one end a handle G¹
by which it may be manually operated and at the other end a crank G³; it also
comprises an arm C which is of greater radius than that of the crank G2 and is
secured upon the shaft C and connected by a connecting rod H to that arm, so
that upon rotation of the shaft G the crank G³ imparts reciprocatory angular move-
ment to the arm C, the shaft G arms D and frame E E..
The frame A together with its appurtenances thus far described rests upon and
is supported by a similar frame J which surrounds on four sides the curved sieve
and is itself supported by parallel bars J¹ fixed to two of its sides and given such
length as to enable them to rest upon the edges of troughs (such as X) of various
widths. Endwise movement of the frame J is prevented in one direction by reason
of the situation of the end of the frame with regard to the adjacent wall of the
trough, and in the opposite direction is prevented by a distance piece Ja secured
to the underside of each bar. These distance pieces are adjustable endwise to suit
the apparatus to troughs of various widths, being retained in any position within
their range of adjustment by bolts J³ which pass through slots in the distance
pieces. The frames A. and J are preferably hinged to each other at J³, so that the
upper frame A can be turned with the aid of one of the handles A³ into the
position indicated by dotted lines in Figure 2 to enable ready access to be had to
the under face of the curved sheet B. The hinge is provided at the same side of the
apparatus as that upon which the gear for oscillating the shaft C is situated, so that
the weight of this gear has not to be moved far in turning the frame A about its
hinge as desired.
The whole apparatus is ordinarily of such size and weight that it is easily
portable; it is preferably provided with a strap J' looped or bent as at J5 to
engage a peg or nail by which it may be hung from a wall or other support.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
1. In sifting-apparatus the combination of a frame such as A and a flanged sieve
such as B B B substantially as described.
2. In sifting-apparatus the combination of frames such as A and J and a flanged
sieve such as B B¹ B substantially as described.
3. In sifting-apparatus of the kind described a reciprocatory frame such as E E¹
radially adjustable in relation to its shaft C.
4. In sifting-apparatus of the kind described the combination with a shaft C
and an arm such as D of devices arranged and operating substantially as described
and illustrated in the accompanying drawings for effecting radial adjustment of
the arm D.
5. In sifting-apparatus of the kind described the combination with supporting-
bars such as J of adjustable distance-pieces such as J for the purpose described.
6. The combination and arrangement of parts constituting the complete portable

page_text: sifting-apparatus substantially as described and illustrated in the accompanying
drawings.
Doted this 8th day of December 1897
GEORGE SAMUEL BAKER.
WILLIAM KING BAKER.
Boult & Wade,
Agents for the Applicants.