IMPROVEMENTS IN SILK MACHINES FOR DRESSING FLOUR, PART OF SUCH IMPROVEMENTS BEING APPLICABLE FOR SIEVING OR SIFTING OTHER POWDERED OR PULVERIZED MATERIAL
Year: 1874

page_text: .
LETTERS PATENT to William Pindar and Asher Graham Pindar,
both of the City of York, in the County of the said City of York,
Wire Manufacturers, for the Invention of "IMPROVEMENTS IN SILK
MACHINES FOR DRESSING FLOUR, PART OF SUCH IMPROVEMENTS BEING
APPLICABLE FOR SIEVING OR SIFTING OTHER POWDERED OR PULVERIZED
MATERIAL."
Sealed the 3rd July 1874, and dated the 9th January 1874.
PROVISIONAL SPECIFICATION left by the said William Pindar and
Asher Graham Pindar at the Office of the Commissioners of Patents,
with their Petition, on the 9th January 1874.
We, WILLIAM PINDAR and ASHER GRAHAM PINDAR, both of the
City of of York, in the County of the said City of York, Wire Manu-
facturers, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN SILK MACHINES FOR DRESSING FLOUR, PART OF SUCH IMPROVE-
MENTS BEING APPLICABLE FOR * SIEVING' OR SIFTING OTHER POWDERED
PULVERIZED MATERIAL," to be as follows:-
OR
Our Invention has for its object improvements in machines known as
"silk" machines for sieving or sifting flour, whereby the operation is

page_text: performed with greater speed and more satisfactorily than by silk
machines of ordinary construction, part of such Invention being also
applicable for sieving or sifting other powdered or pulverized material.
In suitable bearings on a shaft between framework we provide a silk
sieve of ordinary construction"; to this sieve is given a rotary motion
through suitable gearing, but our improvements consist in imparting
thereto in combination with the rotary motion an intermittent recipro-
cating motion; by this means the flour is kept in motion whereby more
of it is shaken through the sieve consequently less carried of in waste.
The above mentioned intermittent reciprocating motion is given by a
crank eccentric or cam which is carried in suitable bearings on the sieve,
the crank, eccentric, or cam is made to revolve by means of suitable
gearing.
This arrangement of machine is also applicable for sieving or sifting
other powdered or pulverized material.
In the place of the silk covering which is used to form the sieve for
sieving or sifting flour and other similar substances a metallic or other
suitable perforated covering may be employed.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Pindar and Asher Graham Pindar in the 2
Great Seal Patent Office on the 9th July 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
PINDAR and ASHER GRAHAM PINDAR, of York, in the County of York,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her 2
Letters Patent, bearing date the Ninth day of January, in the year of
our Lord One thousand eight hundred and seventy-four, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said William Pindar and Asher Graham
Pindar, Her special licence that we, the said William Pindar and Asher 3
Graham Pindar, our executors, administrators, and assigns, or such
others as we, the said William Pindar and Asher Graham Pindar, our
executors, administrators, and assigns, should at any time agree with

page_text: and no others, from time to time, and at all times thereafter during
the term therein expressed, should and lawfully might make, use,
exercise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for
"IMPROVEMENTS IN SILK MACHINES FOR DRESSING FLOUR, PART OF SUCH IMPROVE-
MENTS BEING APPLICABLE FOR SIEVING OR SIFTING OTHER POWDERED OR PULVERIZED
MATERIAL," upon the condition (amongst others) that we, the said
William Pindar and Asher Graham Pindar, our executors or adminis-
trators, by an instrument in writing under our, or one of our, or
their, or one of their hands and seals, should particularly describe and
ascertain the nature of the said Invention, and in what manner the
same was to be performed, and cause the same to be filed in the
Great Seal Patent Office within six calendar months next and imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that we, the said William Pindar and Asher Graham
Pindar, do hereby declare the nature of our said Invention, and in what
manner the same is to be performed, to be particularly described and
ascertained in and by the following statement, reference being had to
the accompanying Drawings, and to the letters of reference marked
thereon, that is to say :-
Our Invention has for its object improvements in the machines known
as "silk" machines for sieving or sifting flour, whereby the operation is
performed with greater speed than by the silk machines of ordinary
construction, part of such Invention being also applicable for sieving or
sifting other powdered or pulverized material.
Our Invention will be completely understood by reference to the
accompanying Sheet of Drawings, in which Fig. 1 represents a side
elevation; Fig. 2, an end elevation; Fig. 3, a plan looking at the top;
and Fig. 4 shews the construction of the drum or sieve. Similar letters
of reference refer to like parts in all the Figures.
On the framework a we mount the shaft 6 which is carried in suitable
bearings c, this shaft is continued through the hollow shaft d on which
is carried the sieve e as shewn. On the shaft 6 we mount the bracket f
into which is fixed the end of the hollow shaft d. On the bracket fis
carried the shaft g on which is mounted the plate h to which the rotary
motion is given through bevel wheels and ³, spur wheels j, and driving
pulley k. On the plate h is provided the crank pins / the end of which

page_text: we by preference make spherical. To the shaft is attached the rod m
which is coupled to the crank pin 7 by means of the coupling n and
connecting rod o; the end r is fitted so as to work freely on the
spherical end of the crank pin l. The bevel wheel i and spur wheel j
are loose on the shaft b. The shaft 6 is made to revolve by suitable
gearing and driving pulley k.
The shaft 6 is caused to revolve, at the same time a rotary motion
is transmitted to the plate h. The plate h being in connection or
attached to the shaft 6 by means of the rod m, coupling n, connecting
rod o and crank pin l. When the shaft 6 revolves by being attached as
described to the plate h it takes round with it the bracket ƒ carrying the
face plate h; a rotary motion also is given to the sieve e through the
hollow shaft d to which the bracket fis attached, at the same time the
face plate being caused to revolve, by which means an intermittent
reciprocating motion is given to the bracket f on account of the
changing position of the crank pin 7, which motion is communicated or
transmitted to the sieve e through the hollow shaft d. The effect of
this motion imparted frequently during the rotary motion of the sieve e
is that the flour is thoroughly shaken and sifted; by this means much
less is carried off in waste.
Other equivalent means than those described may be employed for
giving the intermittent reciprocating motion.
This arrangement of machine is also applicable for sieving or sifting
other powdered or pulverized materials.
In place of the silk covering which is used to form the sieve for
sieving or sifting flour or other similar substances, a metallic or other
similar perforated covering may be employed.
Having now described the nature of our said Invention, and the
manner in which the same is to be performed, we would remark in
conclusion that we do not limit ourselves to the exact details and
configuration of parts we have explained and shewn, as the same may of
course be varied or modified without in any way departing from the
nature of our Invention, but what we do claim and desire to be secured
to us by Letters Patent is,-
Firstly. The application of an intermittent reciprocating motion in
IL
11

page_text: Secondly. The arrangement, construction, and combination of the
various parts for giving the required intermittent reciprocating motion
in combination with a rotary motion, as and for purpose herein set
forth.
In witness whereof, I, the said Asher Graham Pindar, for myself
and on behalf of the said William Pindar, have hereunto set my
hand and seal, this Seventh day of July, in the year of our Lord
One thousand eight hundred and seventy-four.
ASHER GRAHAM PINDAR. (L.S.)