IMPROVEMENTS IN THRASHING 33
Year: 1883

page_text: LETTERS PATENT to John Coulson of 12 Bath Place Stamford in the County
of Lincolnshire Engineer for an Invention of "IMPROVEMENTS IN THRASHING
33
PROVISIONAL SPECIFICATION left by the said John Coulson at the Office of
the Commissioners of Patents on the 11th April 1883.
JOHN COULSON, of 12 Bath Place, Stamford in the County of Lincolnshire
Engineer, "IMPROVEMENTS IN THRASHING MACHINES
"
The object of my said invention is to work the shakers of Thrashing machines
by means of four outside cranks or eccentrics, and thereby to use a plain straight
shaft inside the machine, and also from the same cranks or eccentrics to actuate
the shoes.
The driving shaft is mounted in suitable bearings, and extends beyond the side
frames and is fitted with outside cranks or eccentrics which carry the shakers by
means of connecting rods and cross bars fitted under the shakers, and either in
pairs or sets, according to their number.
The cranks or eccentrics are fitted in pairs, one pair at each end of the shaft, and
in such a manner as to balance each other, two or more shakers are rising while an
equal number are descending But any number of shakers may be used and fitted
to the alternate cross bars.
One end of the shakers is supported by rocking levers, the lower ends of which
levers are fitted with a few teeth in a curve, which work in a corresponding rack
to ensure a greater lift than would be the case with a fixed centre. A provision is
attached to prevent the lever from leaving the rack.
Connecting rods are fitted to the cranks or eccentrics, on the driving shaft, which
lead to and actuate the shoe or shoes and shog board, whereby I dispense with
much of the additional gear at present in use in machines of a similar nature.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent and of
an Order of the Lord Chancellor filed by the said John Coulson in the Great
Seal Patent Office on the 10th November 1883.
JOHN COULSON of 12 Bath Place Stamford in the County of Lincolnshire
Engineer "IMPROVEMENTS IN THRASHING MACHINES"
The object of my said invention is to work the shakers of Thrashing machines
by means of four outside cranks or eccentrics and thereby to use a plain straight
shaft inside the machine and also from the same cranks or eccentrics to actuate the
shoes.
The driving shaft is mounted in suitable bearings and extends beyond the side
frames and is fitted with outside cranks or eccentrics which carry the shakers by
means of connecting rods and cross bars fitted under the shakers and either in pairs
or sets, according to their number
The cranks or eccentrics are fitted in pairs one pair at each end of the shaft and
in such a manner as to balance each other, two or more shakers are rising while an
equal number are descending But any number of shakers may be used and fitted
to the alternate cross bars.
One end of the shakers is supported by rocking levers, the lower ends of which
levers are fitted with a few teeth in a curve which work in a corresponding rack
to ensure a greater lift than would be the case with a fixed centre. A provision is
attached to prevent the lever from leaving the rack.
Connecting rods are fitted to the cranks or eccentrics, on the driving shaft
which lead to and actuate the shoe or shoes and shog board whereby I dispense
with much of the additional gear at present in use in machines of a similar nature.
I also work the shakers by having longer bars fitted on eccentrics to carry two
cross bars under the shakers by so doing I obtain an universal and parallel action
with the shakers that is to say both ends of the shakers have the same action or
throw two shakers up and the other, two or three, as may be, down-by this means
I dispense with all inside bearings
Having thus described my said invention and the manner in which the same is
carried out 1 Claim
1 The means and manner of working the shakers of Thrashing Machines
substantially as herein before described.
2 In Thrashing Machines the combination and arrangement of the shakers and
parts in connection therewith substantially as and for the purpose hereinbefore
described.
In witness whereof I the said John Coulson hath hereunto set my hand and
seal this ninth day of November in the year of our Lord one thousand eight
hundred and eighty three.
ΤΟΣΤΑΤ COTT CON