Feeding Millstones or other Grinding or Crushing Machinery, and Preventing Escape of Dust in Grinding Cement, Flour, or any other Substance.
Year: 1889

page_text: Date of Application, 24th May, 1889
Complete Specification Left. 24th Feb., 1890-Accepted. 3rd May, 1890
PROVISIONAL SPECIFICATION.
Feeding Millstones or other Grinding or Crushing Machinery, and
Preventing Escape of Dust in Grinding Cement, Flour, or any
other Substance.
WILLIAM JOSEPH WILDERS Manager of Portland Cement Factory 58 Dover Road
Northfleet, and EDWARD FRANCIS WILDERS 51 High Street Northfleet, Carpenter,
do hereby declare the nature of this invention to be as follows:-
A screw cased in entirely is used to feed the grinding machinery. By this means,.
dust (arising in the case of millstones from the eye of the stone) is prevented from
escaping, a regular feed is ensured, and less driving power than usual is required.
The screw may be driven faster or slower by means of reduced pulleys worked from
the main shaft of the cog pit by a fast & loose pulley, which enables all the feeders
(when a series is used) to be stopped or started by one lever. One advantage of this
system is its noiselessness.
Dated this 22nd day of May 1889
WILLIAM JOSEPH WILDERS.
EDWARD FRANCIS WILDERS.
COMPLETE SPECIFICATION.
Feeding Millstones or other Grinding or Crushing Machinery, and
Preventing Escape of Dust in Grinding Cement, Flour, or any
other Substance.
WILLIAM JOSEPH WILDERS Manager of Cement Works 58 Dover Road Northfleet
Kent EDWARD FRANCIS WILDERS Carpenter 51 High Street Northfleet Kent
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, and accompanying drawings
A. screw working under a hopper and cased in entirely is used to feed the grinding
machinery which is also entirely encased. By this means, dust (arising in the case of
millstones, from the eye of the stones, and from the shoot) is prevented from escaping,
a regular feed is ensured, and less driving power than usual is required. Two
arrangements for actuating the feeding screw are shown in the drawings to this
specification. In the first arrangement, which is preferable, motion is communicated
to the feeding screw shaft from the damsel, by worm gearing.
A clutch may be used for throwing the worm gearing into or out of gear.
In the second arrangement the feeding screw is actuated by worm gearing driven
by a strap from overhead shafting in connection with the main shaft of the cog pit.
Cone or reduced pulleys are used for driving the feeding screw, and a live and dead
pulley serve to throw the feeding apparatus in or out of gear.
The worm gearing is of course proportioned to the size of the millstones and to
the speed. If the stones are running at 120 revolutious a minute, the feeding screw
should revolve about 4 or 5 times a minute according to the situation of the
hopper.
In the casing over the millstone, an opening is made sufficiently large to admit the
end of the shoot, the shoot is covered in close up to the hopper, thus preventing the
escape of dust. A slide at the bottom of the hopper is raised or lowered according
to the feed into the shoot. The screw must have a clear space all round it of at least
two inches from the sides & bottom of the shoot so that it may work freely. The top
of the screw must only enter the bottom of the hopper just sufficiently to keep the
material alive.

page_text: For soft material the worm may be made of wood or soft metal. The worm must
be driven to suit the material being fed, different speeds being, of course, required
for such different substances, as wheat, chemicals, clinker, &c.
Figs. 1. 2. & 3 illustrate the first described arrangement in which the feeding screw
is actuated from the damsel.
Figs. 4. 5.& 6. illustrate the arrangement in which the screw is actuated by over-
head shafting worked from the cog pit. The same letters refer to the same parts in
all the figures.
In figs. 1. 2 & 3. A is the hopper leading into the shoot B. in which works the
screw actuated from the screw shaft by the worm gearing D from the damsel E.
and centre bar F. The end of the shoot B fits into an opening in the millstone
casing H and conducts the material to be ground into the eye G of the millstone.
I is the slide, at the bottom of the hopper A, which is raised when the feed wants
increasing.
The shoot is covered in close up to the hopper, so as to prevent the escape of dust;
and the millstones being entirely encased and the shoot fitting closely into the case,
all escape of dust is prevented and the feed is regular and noiseless.
In figs. 4. 5. & 6. the screw C is actuated by worm gearing D. driven by a strap
from overhead shafting connected with the main shaft of the cog pit.
The other parts of the apparatus are the same as in the first described
arrangement.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
The combination of closed in feeding apparatus, enclosed millstones or other
grinding apparatus, and actuating mechanism for the feeding apparatus, which com-
bination is for feeding material to be ground or crushed to the eye of millstones or
to other grinding or crushing machinery, all as described by specification and
drawings.
Dated this 22nd day of February 1890.
W. J. WILDERS.
E. F. WILDERS.