Improvements in or connected with Machines for Cleaning and Screening Malt or the like.
Year: 1892

page_text: Date of Application, 22nd Oct., 1892
Complete Specification Left, 22nd July, 1893-Accepted, 9th Sept., 1893
Improvements in or connected with Machines for Cleaning and
Screening Malt or the like.
I, THOMAS STEVENS, of Ceres Iron Works, Kingston-on-Thames, in the County
of Surrey, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention refers to machines for cleaning and screening malt, and particularly
to the so called "drop bed" malt screen wherein the inclined bed is formed with a
step or drop dividing an upper from a lower screen, although such improvements
may be readily applied to other types of machine.
According to my invention the upper half bed or both beds are supported upon
or by springs, (cuclosed if desired in a dust tight box) and a cam or cams is or are
situated either above or below the screen or screens, so that when in action the
said cams compress the springs and then suddenly release them, thus giving motion
to the screens, thereby preventing the malt or the like resting upon the screen,
while at the same time the spaces of the screen become cleared.
In some cases, instead of compressing the springs, the cams may act to expand
same, and the retractile force be utilized to return the screens.
Dated this 22nd day of October 1892.
COMPLETE SPECIFICATION.
Improvements in or connected with Machines for Cleaning and
Screening Malt or the like.
I, THOMAS STEVENS, of Ceres Iron Works, Kingston-on-Thames, in the County
of Surrey, 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 :—
My invention refers to machines for cleaning and screening malt, and particularly
to the so-called "drop-bed "nalt screen wherein the inclined bed is forined with a
step or drop dividing an upper from a lower screen, although such improvements
may be readily applied to other types of machine.
According to my invention, the upper half bed or both beds are supported upon
or by springs, (enclosed if desired in a dust-tight box), and a cam or cams is or are
situated either above or below the screen or screens, so that when in action the
said cams compress the springs and then suddenly release them, thus giving motion
to the screens, thereby preventing the malt or the like resting upon the screen,
while at the same time the spaces of the screen become cleared.
In some cases, instead of compressing the springs, the cams may act to expand
same and the retractile force be utilized to return the screens.
In order that my invention may be more fully described and readily carried into
effect, I will now proceed to further describe same with reference to the accom-
panying drawings."
Fig. 1 is a sectional side elevation, and Fig. 2 is a front view of my improved
drop bed malt screen constructed according to my invention.
Fig. 3 is a sectional elevation of the upper or hopper end of the screen drawn on
a larger scale than the previous figures.

page_text: Fig. 4 is a vertical cross section taken through the line A. B of Fig. 3.
Figs. 5 and 6 are detailed views of the springs and dust-tight box, and
Fig. 7 is a vertical section shewing the side of the frame and cant against which
the screen bears.
Similar letters of reference refer to like parts in all the figures.
A is the upper and B is the lower bed of the screen A¹ B', and my invention is
shewn as applied to the upper half bed of machine. CC are the springs, which
may rest upon a plate C₁ secured to the framework of the machine, and DD are
the dust tight boxes in which the said springs are inserted, the said boxes being
securely bolted to the framework of the screen. FF are the cams on the shaft G
Fig. 3 carrying a hand wheel H driven by handle H', on turning which the cams F
are revolved, and in so doing the springs C are compressed in the boxes D between
the top of box and plate C', and as soon as the cam has passed its extreme point, the
springs bring back the screens (which the cams had lowered) to their original
position, and so on. The cant or slope L as shewn at Figs. 3 and 7 is fixed to the
side of the frame A, and the bed of the screen A' when at rest is pulled up to it
by the springs; the cant L is of course cut away to allow for the springs and cam
parts. Jis the feed hopper in which the malt to be screened is placed. K, dust
box. The clean malt goes off at the end of the bed B, while the dust falls through
the screens A B¹.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
1. In machines for cleaning and screening malt or the like, the springs Cin
boxes D; in combination with cams F, arranged above or below the screens, whereby
the springs are compressed and suddenly released, and thereby imparting an up
and down or jogging motion to the screens, substantially as and for the purposes
herein before described and illustrated with reference to the accompanying
drawings.
2. In malt screens, the application to the screen frames thereof of springs for
suddenly bringing the sieves back when the said springs are released by the action
of cams or equivalent means, and substantially as and for the purposes hereinbefore
described and illustrated with reference to the accompanying drawings.
.
BREWER & SON,
London and Leeds, Agents for Applicant.