Improvements in Grist Mills
Year: 1887

page_text: Date of Application, 11th June, 1887
Complete Left, 9th Mar., 1888
Complete Accepted, 20th Apr., 1888
ROBERT BURNS Mechanical Engineer of Rugeley in the county of Stafford do hereby
declare the nature of this invention to be as follows:-
This invention has for its object "Improvements in Grist Mills" whereby such Mills
are rendered more effective in work & less liable to derangement.
The First part of this invention relates to the grinding rolls A. A 1, with their
respective concaves B. B 1 ; & consists in fitting the rolls A. A 1, with their con-
caves B. B 1, in a suitable vertical frame C; one pair roll & concave being set imme-
diately above a second pair roll & concave in the frame C as shown on Drawings.
The Second part consists in fitting weighted levers D. D I, with rods D 2 D 3,
& hand bars D 4 D 5 to the concaves B. B 1.
The Third part of the invention relates to a movable shoot E which conveys
the grist or other material from the upper to a lower pair roll & concave for
regrinding.
By simply changing the position of the movable shoot E as shown by dotted lines
on Drawing the grist will leave the Mill having passed through one pair roll
& concave only.
The Fourth part relates to the feeding shoe F & consists in attaching one or more
setting screws 1, with adjusting nut F 2, at one or both sides of F to regulate its
action on the wiper F 3.
The Fifth part relates to chain G and driving gear H for driving the lower roll A 1
or rolls, also for giving motion to the feeding cam or wiper F 3.
It will be seen by a reference to the Drawing that one or more pair of grinding roll
& concave may be fitted in the same frame C, pair above pair, so that the grist or other
substance being ground in the top pair roll & concave A. B may pass in its descent
through one or more pair roll & concave so as to be ground, kibbled, or crushed to
any required sample.

page_text: I, ROBERT BURNS, Mechanical Engineer of Rugeley in the county of Stafford 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 for its object Improvements in Grist Mills whereby such mills
are rendered more effective in work & less liable to derangement.
The first part of this invention relates to the grinding rolls .A. A 1 with their
respective concaves B. B 1 & consists in fitting the rolls A. A. 1 with their
concaves B. B 1, in a suitable vertical frame C, one pair roll & concave being set
immediately above a second pair roll & concave in the frame C as shewn on
Drawing Fig. 1.
The Second part consists in fitting weighted levers D. D 1 with rods D 2. D 3
& hand bars D 4. D 5 to the Concaves B. B 1.
The Third part of the Invention relates to a movable shoot E which conveys the
grist or other material from the upper to a lower pair roll & concave for re-grinding.
By simply changing the position of the movable shoot E as shewn by dotted lines
on Drawing Fig. 1 the Grist will leave the Mill having passed through one pair roll
& concave.only.
The Fourth part relates to the feeding shoe F & consists in attaching one or more
setting screws F 1 with screw wheel F 2 at one or both sides to regulate the action of
the feed shoe on the cam or wiper F 3.
The Fifth part relates to chain driving gear whereby motion is communicated
from A to A 1 or vice versa as shewn on drawing sent with Provisional Specification.
It will be seen by a reference to the Drawings Fig. 1 that 2 pairs Roll & Concave
only are fitted in the frame C, this system is capable of modification, so that one, two, or
more rolls with their respective Concaves may be placed one above the other, thus
increasing the efficiency of the mill by a process of gradual reduction.
By further reference to Fig. 1 it will be seen that the hand bars D 4. D 5 are
secured to the concaves B. B.1 & rest upon crossheads fixed on the way bar shafts M. M 1
the waybar shafts being connected with the levers D. D 1 coupled by the rods D 2. D.3
to the counter levers Jare acted upon by the dead weights J 2. nevertheless in the
event of nails or other hard substances passing in with the grain, the weights.&
levers allow the hard materials to escape without injury to the parts & automatically
re-adjust the grinding surfaces.
The grinding Rolls may be driven by Belts, Chains, Wheel gearing or other suitable
contrivance, for instance the present drawings are arranged for strap driving, but
could with great facility be driven with Bevel, Spur or Skew gear, according to the
nature of the place and the circumstances for obtaining the power.

page_text: As will be seen by a reference to Drawing Fig. 1 I cover in the front of the mill,
over the Concaves B. B 1 with guards C 7, thus preventing escape of dust & reduce
the sound when working, the guards C 7 may be made of Wood, Iron or any other
suitable materials.
Fig. 3 is a detail of my improved Concave, it will be seen that the edges have iron
guards protecting wooden linings, that come in contact with the grinding rolls, the
guards can be dispensed with, without injury & the wood itself simply secured by
means of screw pins or other suitable contrivance.
The details of construction heroin before described may be varied without departing
from my invention.
Fig. 1. Sectional Elevation.
"
2. Part sectional plan.
3. Sectional detail of Concave.
"1
A A 1. Fluted or Corrugated Rollers.
B. B 1. Corrugated or Fluted Concaves, capable of adjustment (to the grinding
surfaces of Rollers A. A 1) by means of hand (or setting) wheels D 6. D 7.
C. Framework of mill.
C1. Partition forming back spout for carrying off ground materials which has only
passed through the top pair roller & concave.
C 2. Base plate.
C 3. Legs for supporting mill.
C 4. Side cheeks on hinge joint at back.
5. Hopper base.
C 6. Hopper.
C 7. Guards covering front of mill.
C 8. Wood coverings for back of mill.
D. D 1. Levers fitted on way bar shafts M. M 1.
D 2. D 3. Connecting rods to join levers D. D 1 with counter levers J.
D4. D 5. Hand bars for raising concaves B. B 1 off rollers A. A 1.
D 6. D 7. Hand (or setting) wheels with suitablo screw D 8 Fig. 2 (and fitted with
lock lever) which screw has its point of resistance on a bracket D 9 Fig. 2. the said
bracket being fixed to the main frame C, the screw D 8 passes through an eye in the
lever D 1 which is screwed, by this arrangement the closeness of the concaves B. B 1
are regulated to the grinding rollers A. A 1 so as to produce fine or course
grinding.
E. Movable shoot for leading material ground by roller A to the roller A 1 for
re-grinding, shewn in dotted lines leading the materials into the back spout having
passed through one roll & concave only.
E 1. Lever for setting movable shoot.
F. Feed shoe receiving motion from cam F 3.
F 1. Setting screw for regulating motion of feed shoe F.
F 2. Screw wheel for adjusting F 1.
F 3. Cam or wiper giving motion to feed shoe F.
J. Counter lever fitted with dead weight J 2.
K. Collecting hopper with spout for exit of ground materials.
L. Driving pulley.
L 1. L 2. Pulleys to give motion to roller A.
L 3. Shaft for roller A 1.
M. M 1. Waybar shafts.
Having now particularly described & ascertained the nature of my said
invention & in what manner the same is to be performed I declare that what
I claim is
10+
DI
151

page_text: many as may be found needful, for the purpose of gradual reduction substantially as
shewn in Fig. 1.
2nd. The placing of a suitable tipping shoot between each pair of upper & lower
Roll & concave to carry the material from an upper to a lower grinding Roll & Concave,
or to carry it off when acted upon by one Roll & Concave only substantially as shown
in drawing Fig. 1.
3rd. Wood linings or their equivalents on sides of Concaves substantially as shown
in drawing Fig. 3.`
4th. General arrangement of levers with their respective connecting rods, weights &
hand wheels for adjusting, substantially as shewn in drawing Fig. 1.
5th. Guards covering front of mill substantially as shown in drawing Fig. 1.
6th. Setting wheels F 2 with screws F 1 for regulating motion of Feed shoe F
substantially as shewn in drawing Fig. 1.