Improvements in Stones or Equivalent Devices for use in Machinery for Grinding Quartz and other Substances.
Year: 1890

page_text: Date of Application, 15th Nov., 1890
Complete Specification Left, 15th Sept, 1891-Accepted, 17th Oct., 1891
PROVISIONAL SPECIFICATION.
Improvements in Stones or Equivalent Devices for use in Machinery
for Grinding Quartz and other Substances.
1, JOSEPH ADAIR of Wyndham Mining Company, Egremont in the County of
Cumberland, Mine Owner, do hereby declare the nature of this invention (which
has been communicated to me from abroad by Alfred Adair and John George
Cruickshank both of Johannesburg in the South African Republic) to be as
follows:-
This invention relates to stones or equivalent devices described in the
Specification of Letters Patent dated April 13th 1889 No. 6329 and has for its
object to increase the durability and efficiency of such stones or devices. The
stones or devices are built up of sections of metals, stone, emery or any plastic
substance which can be afterwards burnt or hardened in the form required. Or
the main body of the device is provided with grooves or recesses therein for the
reception of blocks strips sections or blades composed of a material different from
that which the other part or main body of the device is made. These blocks strips
sections or blades are made of a spiral form and so arranged that the inclination of
the blades or sections of the lower disc taken from the bottom of the blade upwards
is against the direction of rotation of this disc. The top disc being a counterpart
of it.
By using this spiral form the leading edges of the blades or sections under wear
constantly maintain their original draught and the lands maintain also their
original form.
The inclination of these blades or sections also gives the dress an obtuse angle.
The spiral blades or sections may be made thinner and wedge shaped towards the
centre of the stone or device and may be made of varying widths and shapes. In
constructing the discs the blades or sections are preferably apportioned in such a
way on the grinding surface that the outer circumference presents a larger area of
hard grinding surface than the inner circumference.
This may be done by arranging a greater number of blades or sections on the
outside or near the periphery than near the centre or eye of the stone or device.
The discs may be built up of a number of concentric rings of these spiral blades
or sections and the inclination of each set of blades may be arranged in any order
required to suit the class of material operated on.
The object of these concentric rings of spiral blade or sections is to more
effectively deal with varying grades or sizes of stuff, generally the number of blades
towards the centre of the disc is increased for finer stuff' and decreased for coarser
stuff.
The blades or sections may be fixed to the pan or holder by wedges or other
suitable means.
T
W 1900

page_text: COMPLETE SPECIFICATION.
Improvements in Stones or Equivalent Devices for use in Machinery
for Grinding Quartz and other Substances.
I JOSEPH ADAIR of Wyndham Mining Company Egremont in the County of
Cumberland Mine Owner do hereby declare the nature of this invention (which
has been communicated to me from abroad by Alfred Adair and John George
Cruickshank both of Johannesburg in the South African Republic) and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement :-
This invention relates to stones or equivalent devices described in the
Specification to Letters Patent dated April 13th 1889 No. 6329 and has for its object
to increase the durability and efficiency of such stones or devices. The stones or
devices are built up of sections consisting of metal, stone emery or any plastic
substance which can be afterwards burnt or hardened in the form required. Or
the main body of the device is provided with grooves or recesses therein for the
reception of blocks strips sections or blades composed of a material different from
that which the other part or main body of the device is made. These blocks strips
sections or blades are made of a spiral form and so arranged that the inclination of
the blades or sections of the lower disc taken from the bottom of the blade
upwards is against the direction of rotation of this disc. The top disc being a
counterpart of it.
The accompanying drawings illustrate grinding stones or devices constructed or
built up, according to this invention, of various forms of sections but it is not
restricted to the forms shown as they may be varied without departing from the
nature of the invention.
These spiral blades or sections a may be made of metal, stone, emery, or of any
suitable plastic material which after being moulded to the required form can be
hardened by burning or otherwise, and may be rectangular in cross section as shewn
in Figures 1, 2 and 3 or they may be made thinner and wedge shaped towards the
centre of the stone or device as shewn in Figures 4, 5 and 6 or they may be made
of varying widths and shapes as shewn for example in Figures 7, 8 and 9. In
constructing the discs or grinding devices the blades or sections a are preferably
apportioned in such a way that the discs present a larger area of grinding surface
at the outer circumference d of the disc than at the inner circumference e.
This may be done by making the blades of a tapering form in section as shewn,
in Figure 4 or by arranging a greater number of blades or sections on the outside
or near the periphery than near the centre or eye of the stone or device as shewn
in Figure 7.
The discs may be built up of a number of concentric rings containing these spiral
blades or sections as shewn in Figure 10 the inclination of the blades in each ring
being arranged in any order required to suit the class of material operated on.
The object of these concentric rings containing the spiral blade or sections is to
more effectively deal with varying grades or sizes of stuff, generally the number of
blades towards the centre of the disc is increased for finer stuff and decreased for
coarser stuff.
The blades or sections may be fixed to the pan or holder by wedges or other
suitable means and the compound grinding devices may for purpose of strength be
surrounded by metal hoops f as shown.
By using this spiral form of blades or sections the leading edges b under wear
constantly maintain their original draught and the lands e maintain also their
original form.
The inclination of these blades or sections also gives the dress an obtuse angle.

page_text: 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 :-
1st. Stones or devices for grinding quartz and other substances built up with or
having therein sections or blades of metal or other suitable hard material of a spiral
form which under wear constantly maintain their original draught and horizontal
sectional area substantially as hereinbefore described.
2nd. In stones or devices for grinding quartz and other substances, spiral blades
or sections of metal or other suitable hard material of wedge shape or tapering form
in section substantially as herein before described and illustrated in the accom-
panying drawings.
3rd. In stones or devices for grinding quartz or other substances a combination
of spiral sections or blades of different forms in section arranged substantially as
and for the purpose hereinbefore described and illustrated in Figures 7, 8 and 9 of
the accompanying drawings.
4th. Stones or devices for grinding quartz, and other substances built up of
concentric rings each ring being built up of or having therein spiral sections or
blades of metal or other suitable hard material substantially as hereinbefore
described with reference to Figure 10 of the accompanying drawings.
Dated this 8th day of September 1891.
JOSEPH ADAIR.