Year: 1888

page_text: I SAMUEL BRASSINGTON BAMFORD of the firm of Henry Bamford and Sons
Agricultural Engineers of Uttoxeter in the County of Stafford do hereby declare the
nature of my invention and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :—
In grinding mills requiring a feeding apparatus I make use of a spout or shaker
trough placed underneath the hopper containing the material to be ground and
preferably in a line over the horizontal main axle of the mill. On this axle I fix a
disc or can having a waved side. Against this waved disc or cam is a leg projecting
from the underneath side of the spout at its delivery end and in order that the spout
shall partake of a reciprocating motion from the cam the leg is forced against the
wave side of the cam by the power of a spring fixed against a lover on the opposite
end of the spout and on which lever the spout bangs.
The delivery end of the spout is raised or lowered by a chain and barrel with a
hand wheel having ratchet or notched teeth on its periphery and a catch for fixing
the said spont at any height.
In order that as the delivery end of the spout is raised the reciprocating motion
may be reduced or stopped the leg projecting downwards from the spout is made to
slide through fixed jaws or guides placed over the cam. That part of the leg sliding
through the jaws is made with one slanting side so tint as it is lifted up by the hand
wheel and chain the slanting part of the leg passing through the guide causes the leg
to be forced backwards and away from the cam until the reciprocating motion is reduced
or stopped altogether as may be desired. Thus by simply turning the hand wheel the
feed can be regulated or entirely stopped.
I will now proceed to describe with reference to the accompanying Drawings the
manner in which my invention is to be performed.
Figure 1 represents in side elevation Figure 2 in end elevation and Figure 3 in
plan a grinding mill provided with feeding apparatus constructed according to my
invention. Figure 4 represents a modification of the feeding apparatus.
The same letters of reference indicate the same parts in Figures 1, 2, 3 and 4.
I will first describe the feeding apparatus represented in Figures 1, 2 and 3.
a is the horizontal main shaft of the mill and b is the parallel driving shaft carrying
the hand worked fly wheel or power driven fly wheel the said fly driving whool c
being furnished with an internal toothed wheel d which gears with the pinion e on the
main driving shaft a and thereby drives the said shaft. The said main shaft a has
fixed upon it the waved dise or cam from which the feeding spout or shaker trough g
of the feeding apparatus is worked the said cam being situated under the delivery
end of the said spout g. The waved disc or cam is a face cam the "rise" of which
has the wedge shapo best seen in Figure 1. The roar end of the spout or shaker
trough g is hung to and supported by the lever jointed to the spout at 4 and to the
fixed part of the hopper at and on the underside of the delivery end of the spout

page_text: or snaker trough is a leg upon which leg the cam facts to give the reciprocating
motion to the said spout or shakor trough the said leg being maintained against the
face of the cam and the forward motion given to the shaker trough by the coiled
spring acting against the upper arm of the lever h. The leg is situated and
works between the branches of a forked guide or jaw m fixed on the outside of the
receiving box p of the mill. As the cam rotates its broad part or rise acting
against the legk pushes back the said leg and with it the spout or shaker trough g
the said trough turning on the centre and slightly descending. As the rise of the
cam is taken out of action by the rotation of the shaft a forward motion accompanied
by a slight lifting or tilting motion is given to the trough through the action of
the coiled spring. In this way a reciprocating motion together with a slight rising
and falling or shaking motion in the spout or trough g is produced and the feeding
of the material from the hopper into the case or box p containing the crushing or
grinding barrel or discs is effected.
9
For the purpose of regulating the feed and for stopping the feed when required I
combine with the feeding apparatus described the following parts for raising and
lowering the delivery end of the shaker spout g and for adjusting the position of the
leg with respect to the waved cam f. Over the delivery end of the spout g is a
barrel a turned by the hand wheel 93 having ratchet teeth on its periphery. A pawl
lever or catch engaging with the teeth of the hand wheel 2 prevents the back
rotation of the barrel q. Connected to the delivery end of the spout g is a chain s
the upper end of which is connected to and wound upon the barrel q. By winding the
said chains on the barrel to the desired extent and fixing the said barrel by
the pawl lever the height of the delivery end of the trough 9 can be adjusted as
indicated in dotted lines in Figure 1. As the delivery end of the spout is raised the
said spout is forced backwards by the inner inclined side of the leg k bearing against
the inclined back m² of the forked guide m in which the said leg works. The forcing
backwards of the leg & takes it nearly out of action with the cam that is when the
trough and leg have the positions indicated in Figure 1 the said leg can only be acted
upon by the thickest part of the rise of the cam and the feed stroke of the trough g
is consequently reduced. When the leg is situated intermediate between the thickest
and thinnest parts of the rise of the cam the feed stroke of the trough is slightly
increased and when the leg is lowered to the position represented the feed stroke of
the trough is increased to its full extent. By lifting the trough g by its chains so as
to raise the leg & out of the range of the cam f the feeding apparatus is stopped. In
this way the reciprocating motion of the feeding trough g can be regulated or stopped
at pleasure.
Figure represents in side elevation a modified arrangement of the feeding
apparatus. In this arrangement the waved cam f2 on the main shaft a of the will
is situated at the back of the said shaft and under the spring lever to which the
spout or shaker trough g is jointed and by which the advance stroke of the said trough
is effected. The lever is in this case prolonged downwards at and the waved
cam bears directly upon the said lever to effect the reciprocating motion of the
feeding trough instead of upon a leg at the delivery end of the said trough. The
prolonged end t of the lever works in the forked guide carried by a cross piece
between the uprights u supporting the hopper i.
In this arrangement. the waved cam has several rises upon its face so that several
rapid feed strokes are given to the shaker spout g at each rotation of the main shaft a.
In this modification the feed is regulated and stopped by more or less raising the
delivery end of the shaker trough g by means of the chains and barrel 7 and appliances
connected therewith.
Having now particularly described and ascertained the nature of my invention
and the manner in which the same is to be performed I declare that i claim as my
invention of "Feeding apparatus for grinding mills."
First. The combination with the feeding spout or shaker trough of the spring lever
herein before described and illustrated in Figures 1, 2 and 3 of the accompanying

page_text: Drawings for giving the forward stroke to the said spout or shaker trough and for
maintaining the leg of the spout or shaker trough against the waved disc or cam on
the main shaft of the mill substantially as described and illustrated.
Secondly. The combination of the projecting leg with an inclined side situated on
the underside of the delivery end of the spout or shaker trough with the inclined back
of the forked guide or jaw in which the said leg works for taking the said leg more or
less out of the action of the waved disc or cam and thereby regulating the feed as the
spout or shaker trough is raised or lowered by means of the ratchet dise or hand
wheel and chain and barrel substantially as herein before described and represented in
Figures 1, 2 and 3 of the accompanying Drawings.
Thirdly. The general arrangement or combination of the parts of the fooding
apparatus hereinbefore described and illustrated in Figures 1, 2 and 3 of the accom-
panying Drawings.
Fourthly. The modification of the feeding apparatus bereinbefore described and
illustrated in Figure 4 of the accompanying Drawings in which the spring lever is
prolonged downwards and the waved disc or cam is made to act directly on the said
lever for giving the reciprocating motion to the feeding spout or shaker trough and
the combination with the said modified feeding apparatus of the ratchet disc or hand
wheel and clmin and barrel for raising and lowering the delivery end of the said spout
or shaker trough substantially as described and illustrated.
13. Jako Jesh of Nawah 1880
W. T. WHITEMAN,
Agent for the Applicant.