IMPROVEMENTS IN THRASHING MACHINES
Year: 1882

page_text: LETTERS PATENT to Thomas Nalder and William Nalder, both of Wantage,
in the County of Berks, for an invention of "IMPROVEMENTS IN THRASHING
MACHINES
PROVISIONAL SPECIFICATION left by the said Thomas Nalder and William
Nalder at the Office of the Commissioners of Patents on the 17th March
1882.
THOMAS NALDER and WILLIAM NALDER both of Wantage in the County of
Berks. IMPROVEMENTS IN THRASHING MACHINES
"
"
Our Invention relates to that class of Thrashing Machines in which the shaker
boxes and the shoes are actuated from the same Crank Shaft and has for its object
to transmit the necessary movement from the shaker boxes to the shoes by
direct connections without the intermediate levers and connecting rods hitherto
employed.
We will describe the Invention in connection with a thrashing Machine having
three Shaker boxes with two shoes beneath but it will be understood that the
Invention is equally applicable to machines having more or less than this number.
The two outer boxes are provided at their one end with eyes and corre-
sponding eyes are formed in strut pieces or continuations from each side of the
under shoe.
A rod or bar is passed through these eyes constituting a direct hinged connection
between the outer shaker boxes and the lower shoe. The middle Shaker box has
at one end of its underside (being the end opposite that at which the connection of
the other shaker boxes is hinged to the lower shoe) two eye pieces and the upper
shoe carries corresponding eye pieces Through these eye pieces a rod or bar is
passed forming a direct hinged connection between the said shaker box and the
upper shoe.
The motion of the shaker box is derived from the crank shaft in the usual
manner and this motion is through the hinged connections transmitted directly to
the shoes without the intervention of levers and connecting rods. The shoes are
or may be hung upon the usual spring hangers.
'
It will be understood that the rods or bars which form the hinge joints may be
replaced by short pins and that in place of the shoes receiving their motions from
the particular shaker boxes as described the said motions may be received by
similar connections with any one or more of the Shaker boxes.
It will be readily seen that the Invention is capable of use in a machine having
any number of Shaker boxes.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Nalder and William Nalder in the Great Seal Patent Office
on the 6th September 1882.
THOMAS NALDER and WILLIAM NALDER both of Wantage in the County of
"IMPROVEMENTS IN THRASHING MACHINES "
Berks
Our Invention relates to that class of Thrashing Machines in which the shaker
boxes and the shoes are actuated from the same crank shaft and has for its object
to transmit the necessary movement from the shaker boxes to the shoes by
direct connections without the intermediate levers and connecting rods hitherto
employed.
The means employed for the connections may be pin and knuckle joints India
rubber strips or other suitable hinged or flexible joints.
And in Order that our said Invention may be fully understood we will now
proceed more particularly to describe means by which our Invention may be
carried into effect and for that purpose shall refer to the several figures on the
annexed sheet of Drawings the same letters of reference indicating corresponding
parts in all the figures.
We will describe the Invention in connection with a thrashing Machine having
three shaker boxes with two shoes beneath but it will be understood that the
Invention is equally applicable to Machines having more or less than this number.
Figure 1 is a longitudinal vertical section and Figure 2 is a transverse vertical
section of so much of a thrashing Machine as is necessary to illustrate one mode of
applying our Invention thereto The two outer boxes a are provided at their one
end with eyes b and corresponding eyes c are formed in the sides (or continuations
of the sides) of the undershoe e A rod or bar is passed through these eyes con-
stituting a direct hinged connection between the outer shaker boxes and the lower
shoe. The middle shaker box f has at one end of its underside (being the end
opposite that at which the connection of the other shaker boxes are hinged to the
lower shoe) two eye pieces gg and the upper shoe h carries corresponding eye
pieces. Through these eye pieces a rod or bar is passed forming a direct
hinged connection between the said shaker box f and the upper shoe h.
It will be understood that in this form of connection the rods or bars which
form the hinge joints may be replaced by short pins.
Figure 3 is a view corresponding to Figure 1 illustrating another manner in
which the connections may be formed according to our Invention. The outer
boxes a are hinged or connected at their one end directly to the lower shoe e by the
flexible strips or joints b and the middle shaker box f is directly attached by a
similar flexible joint to the upper shoe h.
The motion of the shaker boxes is derived from the crank shaft k in the usual
manner and this motion is, through the hinged or flexible connection herein before
described, transmitted directly to the shoes without the intervention of levers and
connecting rods. The shoes are or may be hung upon the usual spring hangers
indicated at l.
In place of the shoes receiving their motions from the particular shaker boxes as
described the said motions may be received by similar connections with any one or
more of the shaker boxes. It will be readily seen that the Invention is capable of
use in a Machine having any number of shaker boxes.
Having now described and particularly ascertained the nature of the said
Invention and the manner in which the same is or may be used or carried into effect
we would observe in conclusion that what we consider to be novel and original

page_text: and therefore claim as the Invention secured to us by the herein before in part
recited Letters Patent is :-
The herein before described improvements in thrashing Machines consisting in
the arrangement for giving motion to the shoes from the shaker boxes by
direct connections without intervening levers and connecting rods substantially as
described and illustrated.
In witness whereof we the said Thomas Nalder and William Nalder have
to this our Specification set our hands and seals this first day of September
One thousand eight hundred and eighty two.
THOMAS NALDER.
(L.S.)
WILLIAM NALDER. (LS.)