IMPROVEMENTS IN SCREENS OR DRESSING MACHINES FOR SCREENING OR SIFTING CORN, SEEDS, OR OTHER SUBSTANCES
Year: 1867

page_text: LETTERS PATENT to Robert Boby, of Bury St. Edmund's, in the County
of Suffolk, Machinist, for the Invention of "IMPROVEMENTS IN SCREENS
OR DRESSING MACHINES FOR SCREENING OR SIFTING CORN, SEEDS, OR OTHER
SUBSTANCES."
Sealed the 11th October 1867, and dated the 17th April 1867.
PROVISIONAL SPECIFICATION left by the said Robert Boby at the Office
of the Commissioners of Patents, with his Petition, on the 17th April
1867.
I, ROBERT BOBY, of Bury St. Edmund's, in the County of Suffolk, Machinist,
do hereby declare the nature of the said Invention for "IMPROVEMENTS IN
SCREENS OR DRESSING MACHINES FOR SCREENING OR SIFTING CORN, SEEDS, OR OTHER
SUBSTANCES," to be as follows:-
My Invention relates to an improved method of constructing and arranging
the screening surfaces of corn screens, dressing machines, or any other screening
or sifting machine so as to render them removable and to admit of the
machines being used for screening, separating, or sifting any sized substance,
grain, pulse, or seed. For screening corn I form a screen by constructing a
Inetal frame sufficiently long and broad, and fixing across it at convenient dis-
tances metal supports which are cut or punched at proper distances to receive

page_text: wires of suitable thickness, leaving a space between each according to the
required quality. The wires are placed in the cut spaces parallel to each other,
and the studs of metal left by the cutting or punching are rivetted on the
wires, or the wires may be fixed by solder or any other means so as to insure
their parallelism. Under each of the divisions of the frame I place a bar across
the wires, upon which bar are placed loose collars, pins, or any other arrange-
ment at distances corresponding with the spaces between the wires forming
the screen, and so as to allow the collars to pass between and above each wire
as far as may be desirable. The bar which carries the collars is secured and
kept in its place between each division of the screen by allowing the ends of
the bar to pass through slots in the sides of the iron frame of the screen, the
slots being so arranged as to allow the bars which carry the collars to slide
freely backwards and forwards under each division. Upon the frame of the
machine I fix où each side a metal support, upon which the screen rests
and slides, in which supports are made notches at corresponding distances with
the divisions in the frame of the screen, and into which notches the ends of the
rods carrying the collars fall, and by which they are held stationary during the
to-and-fro motion of the screen, whereby the collars on the bars insure the
clearing of the spaces between the screening wires, and also serve to give
parallelism to the grains; for screening small seeds a screen of a different
kind is required. The framed screen carrying the bars and collars and which
has been used for screening corn is to be removed, and riddles or sieves of the
required sized aperture are to be substituted in its place. The screens or
riddles are all made so as to be easily placed in or removed from the wooden
frame or shute to which a to-and-fro motion is communicated by a crank or
other means.
The object of my Invention therefore is to make easily removable the
screening or sifting portion of corn screens or dressing machines so that by
changing the screen or riddle only the machine may be used for dressing seeds
of various sizes.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Robert Boby in the Great Seal Patent Office on the 17th
October 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT BOBY,
of Bury Saint Edmund's, in the County of Suffolk, Machinist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters

page_text: Patent, bearing date the Seventeenth day of April, in the year of our Lord
One thousand eight hundred and sixty-seven, in the thirtieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Robert Boby, Her special licence that I, the said Robert Boby,
my executors, administrators, and assigns, or such others as I, the said Robert
Boby, my executors, administrators, and assigns, should at any time agree
with, 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 SCREENS OR DRESSING MACHINES FOR SCREENING OR SIFTING CORN, SEEDS,
OR OTHER SUBSTANCES," upon the condition (amongst others) that I, the
said Robert Boby, my executors or administrators, by an instrument
in writing under my, 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 immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Robert Boby, do hereby declare
the nature of my said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by tho
following statement, reference being had to the Drawing hereunto annexed,
and to the letters and figures marked thereon (that is to say):-
My Invention relates to an improved method of constructing and arranging
the screening surfaces of corn screens, dressing machines, or any other
screening or sifting machine, so as to render them removable and to admit
of the machines being used for screening, separating, or sifting any sized
substance, grain, pulse, or seed.
Fig. 1 is a side elevation of a screening or dressing machine with my
improvements adapted thereto; Fig. 2 is a longitudinal sectional elevation of
the screen detached from the other parts, and drawn upon an enlarged scale;
Fig. 3 is a side elevation of a portion of the screen and guide drawn full size;
Fig. 4 is a transverse vertical section of the same taken in the line 1, 2, of
Fig. 3 and also drawn full size.
To form the screening surface a metal frame of sufficient length and breadth
is provided, and across it are fixed at convenient distances metal supports or
bars which are cut or punched at proper distances to receive the longitudinal
wires, leaving a space between the wires according to the required gauge of
screen. The wires are placed in the cut spaces of the supporting bars parallel

page_text: to each other, and the studs of metal left by the cutting or punching are
rivetted on the wires, or the wires may be fixed by solder or any other means
so as to insure their parallelism.
Under each of the divisions of the frame is placed a transverse bar a, shewn
best at Fig. 4, upon which bar are placed loose collars b, pins, or any other
arrangement, at distances corresponding with the spaces between the wires c
of which the screen is formed, so as to allow the collars 6 to pass between and
above each wire c as far as may be desirable, as seen in the Figure. The
bars a, a, which carry the collars c are secured and kept in place between each
division of the screen by allowing the ends of the bars to pass through slots a¹
in the sides of the iron framed of the screen, as shewn at Fig. 2, the slots a'
being so arranged as to allow the bars a which carry the collars c to slide
freely backwards and forwards under each division. Upon the framing
of the machine is fixed on each side a metal support e upon which the screen
rests and slides, in which supports are made notches e¹ at corresponding
distances with the divisions in the frame of the screen, as seen at Fig. 2, and
into which notches the ends of the rods a carrying the collars fall, and by which
they are held stationary during the to-and-fro motion of the screen. By this
means the collars 6 on the bars a insure the clearing of the spaces between
the screening wires c, and also serve to give parallelism to the grains; for
screening small seeds a screen of a different kind is required. The screen
frame d, which carries the bars a and collars b, and which has been used for
screening corn, is to be lifted out of the notches in the metal support e by means
of the handles f, f, Fig. 2, and removed, and riddles or sieves of the required
sized aperture or gauge are to be substituted in its place. The screens or riddles
are all made so as to be easily placed in or removed from the wooden frame
or shoot to which a to-and-fro motion is communicated by a crank or other
means.
The object of my Invention therefore is to make easily removable the
screening or sifting portion of corn screens or dressing machines, so that by
changing the screen or riddle only the machine may be used for dressing seeds
of various sizes.
"
Having now described my Invention of Improvements in Screens or
Dressing Machines for Screening or Sifting Corn, Seeds, or other Substances,"
and having explained the manner of carrying the same into effect, I claim
as the Invention secured to me by Letters Patent as aforesaid, the mode
herein set forth of constructing and adapting the screening or sifting surface
or riddle to the screening apparatus so that riddles or screens of different
gauge may be substituted the one for the other in the same machine in order

page_text: corn or seeds.
picable for screening various kin ΟΙ
In witness whereof, I, the said Robert Boby, have hereunto set my
hand and seal, the Fifteenth day of October, in the year of our Lord
One thousand eight hundred and sixty-seven.
ROBERT BOBY. (L.S.)