Improvements in Grist and Roller Mills.
Year: 1888

page_text: Date of Application, 30th Oct., 1888
Complete Specification Left, 30th July, 1889--Accepted, 31st Aug., 1889
PROVISIONAL SPECIFICATION.
Improvements in Grist and Roller Mills.
I, RICHARD BURNS, of the Brereton Foundry, Rugeley, Staffordshire, Engineer, do
hereby declare the nature of this invention to be as follows:-
This invention has reference chiefly to that class of mills described in the Specifi-
cation of Robert Burn's Patont No. 8400 dated June 11th 1887 in which a number of
rollers and concaves are combined in a vertical series in one frame for the gradual
reduction of grain etc.
The first part of this invention consists of additions to these mills by which the
grain or other substance passing through the mill can be first ground and then crushed
or crushed only or ground only as may be required.
This is carried out as follows:-Below the bottom roller and concave of the said
mill I provide a pair of horizontal crushing rollers such as are commonly used for
crushing grain etc. the spindles. of these rollers revolving in suitable bearings in the
base of the machine and below the rollers is a suitable spout through which the meal,
kibbled oats, maize, etc. descends. These crushing rollers are by preference driven by
a band or chain from one of the roller spindles above. After the grain or other
substance being ground has passed through the grinding rollers and concaves of the
mill it is crushed by passing through the crushing rollers above described. In order
that-the grain or other substance may either be ground and crushed or crushed only 1
provide between the hopper and the top grinding roller a hinged shutter which can be
turned so as either to allow the grain to pass between the top crushing roller and
concave or to allow the grain to pass down a passage at the side of the rollers and
concaves to the crushing rollers below. A similar hinged shutter is provided between
the bottom roller and concave and the crushing rollers so that when the grain etc.. has
passed through the grinding rollers and concaves, it can either. pass through the
crushing rollers or not as may be required.
Another part of this invention consists of improved means of regulating the pressure
of the sliding horizontal roll against the other roll in roller crushing mills. This 1
accomplish by means of what I call a pair of throat wedges which are placed between
the pressure pins of the sliding roller bearings and the frame and are pressed upwardly
The
by weighted levers so as to force the sliding roller against the other one.
adjustment of these wedges is accomplished by their being pressed downwardly through
an upper lever which is regulated by a suitable screw and hand-wheel.
Dated this 29th day of October 1888.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Grist and Roller Mills.
I, RICHARD BURNS, of The Brereton Foundry, Rugeley, Staffordshire, 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:-
This invention has reference chiefly to that class of mills described in the Specifi-
cation of Robert Burns' Patent No. 8400 dated June 11th 1887 in which a number of
rollers and concaves are combined in a vertical series in one frame for the gradual
reduction of grain etc..

page_text: The first part of this invention consists of additions to these mills by which one
grain or other substance passing through the mill can be first ground and then crushed
or crushed only or ground only as may be required.
This is carried out as follows:-Below the bottom roller and concave of the said
mill I provide a pair of horizontal crushing rollers such as are commonly used for
crushing grain etc. the spindles of these rollers revolving in suitable bearings in the
base of the machine and below the rollers is a suitable spout through which the meal,
kibbled oats, maize, etc. descends. These crushing rollers are by preference driven by
a band or chain from one of the roller spindles above. After the grain or other
substance being ground has passed through the grinding rollers and concaves of the
mill it is crushed by passing through the crushing rollers above described. In order
that the grain or other substance may either be ground and crushed or crushed only 1
provide between the hopper and the top grinding roller a hinged shutter which can be
turned so as either to allow the grain to pass between the top crushing roller
and concave or to allow the grain to pass down a passage at the side of the rollers
and concaves to the crushing rollers below. A similar hinged shutter is provided
between the bottom roller and concave and the crushing rollers so that when the
grain etc. has passed through the grinding rollers and concaves it can either pass
through the crushing rollers or not as may be required.
Another part of this invention consists of improved means of regulating the pressure
of the sliding horizontal roll against the other roll in roller crushing mills. This
Laccomplish by means of what I call a pair of throat wedges which are placed between
the pressure pins of the sliding roller bearings and the frame and are pressed upwardly
The
by weighted levers so as to force the sliding roller against the other one.
adjustment of these wedges is accomplished by their being pressed downwardly through
an upper lever which is regulated by a suitable screw and hand-wheel.
On the accompanying drawings Fig. 1 represents in sectional side elevation, Fig. 2
in part front elevation a grinding and rolling mill constructed according to this
invention and Fig. 3 is a sectional plan of the lower part of the same shewing the
crushing rollers.
The upper part of the mill with its grinding roller a and corresponding concave b
and lower grinding roller a¹ and corresponding concave 6 is similar to that described
in the Specification of Robert Burns Patent No. 8400 dated June 11th 1887. cand c
are the pair of horizontal crushing rollers which I provide below the lower grinding
roller a¹ and its concave 6. The spindle d of the roller c runs in bearings e e secured
to the base of the machine and the spindle d of the roller c. runs in bearings e
which are free to slide nearer to or farther from the bearings e as is common in roller
crushing mills. These rollers receive rotary motion from a shaft g through the spur
wheels ³ ³ at each end of their spindles, the shaft g being driven by a band from
the spindle of the upper roller a, at each side of the mill. These bands are marked i
jis the hinged shutter which I sometimes provide between the usual shoe k at the
bottom of the hopper and the grinding roller a and corresponding concave b; this
shutter jis pivotted at its ends to the sides of the mill and is furnished with a suitable
handle outside (not shewn on the drawing) or is otherwise formed so that it can eithe
be turned to the position shewn by the full lines in Fig. 1 to lead the grain or othe
substance being ground between the top roller and concave, or the shutter j can b
turned into the position shewn by the dotted lines, when the grain will be shut of
from the top roller and concave and will run down at the back thereof, either to th
lower grinding roller a and corresponding concave or down the passage m t
the crushing rollers c and c¹ according to the position of the usual shutter n betwee
the two grinding rollers and concaves. o is the hinged shutter which I provide betwee
the lower grinding roller a and the crushing rollers c and c¹. This shutter turns o
side pivots and is furnished with a handle o' and operates similarly to the usu
shutter n.
When it is in the position shown by the full lines in Fig. 1 the grain
other substance will pass through the crushing rollers c and c¹ and out at the spout
below. By turning the shutter o to the position shewn by the dotted lines in Fig.

page_text: its upper edge will meet the lower part of the concave 61 and the grain or other
substance will pass down at the side of the roller c and out at the spout p without being
crushed by the crushing rollers c and c¹.
Instead of employing two grinding rollers and corresponding concaves as in the
mill above described, a single roller and corresponding concave may be used, or there
may be more than two rollers and corresponding concaves.
The mill shown on the accompanying drawings also embodies that part of my
invention which has reference to the improved means of regulating the pressure of
the sliding horizontal roller in roller crushing mills: q' q² are the throat wedges which
are placed between the pressure pins r of the sliding roller bearings e¹ and the frame f
of the mill, each of the pressure pins being slotted to take its throat wedge. The
lower ends of the throat wedges q'q' respectively rest upon short arms of the levers t
turning on the fulcrum t' and provided with weights u at their outer ends which force
the throat wedges upwardly and keep the sliding roller c¹ pressed against the fixed
roller c. vare two upper lovers which act upon the upper ends of the throat
wedges and w is the hand wheel turning on the screw x by which the free ends of the
levers can be moved up or down so as to regulate the height of the throat
wedges and the distance between the rollers c³ c, but at the same time will leave the
roller c' free to slide away from the roller cin case a stone or nail or other obstruction
should pass down between them.
This mechanism for adjusting the sliding roller can be similarly applied to other
roller crushing mills where a sliding roller is used.
In conclusion I wish it to be understood that I make no exclusive claim to the
grinding rollers and concaves apart from the crushing rollers herein described, and
that I do not limit myself to the precise details herein described and illustrated, nor
to the particular means herein described and shewn for adjusting the sliding roller,
as instead of the throat wedges and parts connected therewith, an ordinary bow spring
or other well known means may be employed for that purpose.
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 a combined grinding and crushing mill, the combination with one or more
grinding rollers and corresponding concaves, of a pair of crushing rollers arranged to
crush the meal or other substance after it has been ground by the said roller and
concave, or rollers and concaves, substantially as herein before set forthi.
2. In a combined grinding and crushing mill, the combination with one or more
grinding rollers and corresponding concaves, of a pair of crushing rollers and means
substantially as described by which the grain or other substance can be passed either
through the grinding roller and concave, or grinding rollers and concaves, or through
the crushing rollers, or through both, substantially as hereinbefore set forth.
3. In horizontal roller crushing mills and in combination with the sliding crushing
roller thereof, the throat wedges q' q², pressure pins r, weighted levers t, and regulating
levers, arranged and operating substantially as and for the purposes hereinbefore
set forth.
Dated this 29th day of July 1889.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.