Year: 1886

page_text: Date of Application, 25th Aug., 1886.
Complete Left, 25th May, 1887.
Complete Accepted. 19th July, 1887.
I, GEORGE WILLIAM ELLIOTT of No. 12 Clarkehouse Road, Sheffield, in the
county of Yorkshire, Mechanical and Mining Engineer do hereby declare the nature
of this invention to be as follows:-
This invention consists of two metallic grinding rings, one fixed and the other
rotary. The rotary ring is secured to a disc attached to a rotary shaft, and the fixed
ring is attached to a part of the casing of the machine.
The casing to enclose the disc and rings has bearings in which the rotary shaft
revolves, and also an opening through which the material escapes after being
operated upon.
There is also an opening through that part of the casing whereon the fixed ring is
attached, for the introduction of the material, and which leads to the inside of the
rings, so that the material cannot escape excepting by passing through between the
grinding rings.
The rotary shaft and disc are capable of being moved to bring in contact or
separate the grinding rings as required. This movement is regulated by suitable
arrangements at the ends of the shaft.
The grinding rings are made in one solid piece or in segments, and of metal cast in
moulds or wrought metal stamped or pressed into the required form.
Each ring is formed with alternate circles of teeth and grooves, the circles of teeth
on one ring corresponding in section with the grooves on the other.
The teeth are separated by spaces decreasing in size but increasing in number in
each circle towards the outer edge of the ring.
The teeth are made by preference broader at the base than the top, and the
grooves narrower at the bottom than the top and of a wedge, or a half round
section.
The grinding faces of the rings are arranged parallel to each other or gradually
receeding from each other towards the centre.
The grinding rings may be made separate from the rotary disc and casing as
described, or the tooth arranged as above may be part of the casing and rotary disc.

page_text: The grinding rings may have a combination of teeth, and grooves running radially
or nearly so.
Instead of rings with projections and grooves as above described, metallic plates
may be arranged side by side, or with distance pieces between them, and secured
edgeways to the disc, and side of the casing, with their length at a slight angle with
radial lines, so that the edges of the plates on the disc may not coincide with but cross
those on the casing.
These plates have their grinding edges serrated or formed with teeth of any desired
shape and arranged so that the teeth of the plates on one circle of plates may coincide
with the hollows on the plates on the other circle of plates, and thus form concentric
circles of teeth and grooves. The spaces between the teeth are formed by leaving out
teeth in the plates as required and thus make grinding rings with plates similar to
those above described, and formed by casting or stamping.
For pulping purposes the machines are fixed in troughs, or cisterns with
partitions in the centre arranged so that the material being pulped may circulate
around the cisterns and through the machines until reduced to the required
fineness.
I, GEORGE WILLIAM ELLIOTT 12 Charkehouse Road, Sheffield, Yorkshiro, Mining
and Mechanical 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 consists of two metallic grinding rings, one fixed and the other
rotary.
The rotary ring is secured to a disc attached to a rotary shaft, and the fixed ring is
attached to part of the casing of the machine.
The casing formed to enclose the disc and rings has bearings in which the rotary
shaft revolves and also an opening through which the material escapes after being
operated upon.
There is also an opening through that part of the casing whereon the fixed ring is
attached, for the introduction of the material and which leads to the inside of the
rings so that the material cannot escape excepting by passing through between the
grinding rings.

page_text: The rotary shaft and disc are capable of being moved to bring in contact or
separate the grinding rings as required. This movement is regulated by suitable
arrangements at the ends of the shaft.
The grinding rings are made in one solid piece or in segments, and of metal cast in
moulds, or wrought metal stamped or pressed into the required form. Each ring is
formed with alternate circles of teeth and grooves, the circle of teeth on one ring
corresponding in section with the grooves on the other.
The teeth are separated by spaces decreasing in size but increasing in number in
each circle towards the outer edge of the rings.
The teeth are made by preference, broader at the base than the top, and the
grooves narrower at the bottom than the top, and of a wedge or half round
section.
The grinding faces of the rings are arranged parallel to each other, or gradually
receeding from each other towards the centre.
The grinding rings may be made separate from the disc and casing as described, or
the teeth arranged as above may be part of the casing and the rotary disc.
The grinding rings may have a combination of teeth, and grooves running radially
or nearly so.
Instead of rings with projections and grooves as above described, metallic plates
may be arranged side by side, or with distance pieces between them, and secured
edgeways to the disc and side of the casing, with their length at a slight angle with
radial lines, so that the edges of the plates on the disc may not coincide with, but
cross those on the casing.
These plates have their grinding edges serrated, or formed with teeth of any desired
shape, and arranged so that the teeth of the plates on one circle of plates may coincide
with the hollows on the plates on the other circle of plates and thus form concentric
circles of teeth and grooves.
The spaces between the teeth are formed by leaving out teeth in the plates as
required, and thus make grinding rings with plates, similar to those above described
and formed by casting or stamping.
For pulping purposes the machines are fixed in troughs or cisterns with
partitions in the centre arranged so that the material being pulped may circulato
around the cistern and through the machine until reduced to the required
fineness.
To render the mode of carrying out this invention clearly understood, one sheet of
drawings is annexed.
Fig. 1. represents a segment of a grinding ring having the teeth and grooves all
equal in section, but the teeth and spaces between them decreasing in length and
increasing in number towards the outer edge of the rings, and wedge shape in
section.
Fig. 2. is a section of the rings as arranged in Fig. 1. and showing the grinding
faces parallel to each other.
Fig. 3. is a section of the rings as arranged in Fig. 1. and showing two grinding
faces gradually receeding from each other towards their centre.
Figs. 4. 5 & 6 represent a segment of a grinding ring having the teeth, grooves
and spaces, all decreasing in size towards the outer edge of the rings, and wedgo
shape in section and showing the grinding faces gradually receeding from each other
towards their centre.
Fig. 7. represents a segment of a grinding ring arranged with a combination of
teeth and radial grooves.
Fig. 8. is a section of two rings arranged as in Fig. 7. and showing the grinding
faces parallel to each other.
Fig. 9. is a section of the two rings as arranged in Fig. 7, and showing the grinding
faces gradually receeding from each other.
Fig. 10. represents a segment of a grinding ring arranged with the teeth a
halfround or knuckle section, and all equal in section, and with spaces and teeth about

page_text: equal in size. These teeth may also be arranged with spaces and teeth decreasing in
size as the angular or wedge shaped teeth are in Fig. 4.
Fig. 11. is a section of the two rings arranged as in Fig. 10. and showing the faces
parallel to each other.
Fig. 12. is a section of the two rings as arranged in Fig. 10 and showing the faces
gradually receeding from each other towards their centre.
Fig. 13. represents a segment of a grinding ring arranged with plates side by side
and secured by means of the dovetail portions, to the revolving disc and part of the
casing or cover of the machine.
Fig. 14. is a section of the two grinding rings as arranged in Fig. 13.
Figs. 15. 16. are side views of two of the plates which are arranged side by side to
form the grinding rings as represented in Fig. 13. and show teeth left out in each
of them to enable them to be so arranged as to form the spaces between the teeth
on the grinding rings, similar to those on Figs. 1. 4. 7. 10. which are made by casting
or stamping.
Fig. 17. represents a side view of two of the plates together, having wedge
shaped teeth.
I am quite aware that pulping machines have hitherto been made with grinding
rings formed by plain plates of steel arranged and secured side by side, but not with
their grinding edges serrated, or formed with teeth as illustrated and described
herin, which gives a greater rubbing surface and more definate rubbing and beating
action.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed, I declare that what I claim is
Making grinding and pulping machinery with grinding rings made as herin
described and illustrated.