Improvements in the Manufacture of Grindstones, Hones, Whet- stones, and other Implements for Grinding and Sharpening Reaping and Mowing Machine Cutting Blades, Tools, and other Objects.
Year: 1887

page_text: Date of Application, 19th Feb., 1887
Complete Left, 5th Oct., 1887
Complete Accepted, 8th Nov., 1887
Improvements in the Manufacture of Grindstones, Hones, Whet-
stones, and other Implements for Grinding and Sharpening
Reaping and Mowing Machine Cutting Blades, Tools, and other
Objects.
We, JOHN GEORGE GIBBON, of 34 Lower Leeson Street, Dublin, LL.D., and THOMAS
MOORE, of Sarshill, Kilmore, in the County of Wexford, Carpenter, do hereby declare
the nature of this Invention, to be as follows :-
For the purpose of our invention we use artificial stone composed as hereinafter
described. We take fine sand which we pass through a sieve of the required fineness,
according to the fineness of the stone desired and then thoroughly mix with about an
equal amount of Portland cement, varying somewhat according to the hardness of the
stone required and then add water and work it so as to render it of a consistency of a
stiff mortar. This material we place in moulds of the form of the article to he
produced, and having pressed and tamped it we leave it to set and harden in the
mould. For round grindstones we place a square wooden peg in the centre of the
mould for forming the eye for the spindle; grindstones to be used for sharpening
mowing machine cutting blades we make in the usual form of a double truncated
cone to fit the bevils of two adjoining cutting teeth. For making hones or whetstones
with a handle we prefer to cast the material around a part or foot of the handle. Such
stones may also be cast in the form of a slab which is afterwards affixed by screws to
a frame with handle. We may adapt such hones or whetstones to any reciprocating
mechanism worked by hand, foot or power.
The tools or implements made of the material herein described may be used
generally wet or dry for grinding off material in the same way as emery wheels are
now used in various trades, and for sharpening purposes generally.
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page_text: Improvements in the Manufacture of Grindstones, Hones, Whet-
stones, and other Implements for Grinding and Sharpening
Reaping and Mowing Machine Cutting Blades, Tools, and other
Objects.
We, JOHN GEORGE GIBBON of 34 Lower Leeson Street Dublin LL.D. and THOMAS
MOORE of Sarshill Kilmore in the County of Wexford Carpenter 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 :—
For the purpose of our invention we use artificial stone composed as hereinafter
described. We take fine sand which we pass through a sieve of the required fineness
according to the fineness of the stone desired and then thoroughly mix with about an
equal amout of Portland Cement varying somewhat according to the hardness of the
stone required and then add water and work it so as to render it of a consistency of
a stiff mortar. We may for the sand partly or wholly substitute mineral charcoal
such for instance as is got from the back of a smith's forge. Instead of what is
ordinarily called "sand" we may use other suitable hard granular substances such as
fine sand of silicious slag. This material or composition we place in moulds of the form
of the article to be produced and having pressed and tamped it we leave it to set and
harden in the mould. For round grindstones we place a square wooden peg in the
centre of the mould for forming the eye for the spindle; grindstones to be used for
sharpening mowing machine cutting blades we make it in the usual form of a double
truncated cone to fit the bevils of two adjoining cutting teeth. For making hones or
whetstones with a handle we prefer to cast the material around a part or foot of the
handle. Such stones may also be cast in the form of a slab which is or may be after-
wards affixed by screws to a frame with handle. We may adapt such hones or
whetstones to any reciprocating mechanism worked by hand, foot or power.
The tools or implements made of the material herein described are very durable and
may be used generally wet or dry for grinding off material in the same way as emery
wheels are now used in various trades, and for sharpening purposes generally.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed, we declare that what we claim is :-
The manufacture and use of grindstones, hones, whetstones and other implements
for grinding and sharpening cutting blades, cutting and other tools and other objects
made from a composition consisting of Portland Cement and sand substantially as
set forth.
Dated this 5th day of October 1887.
JOHN GEORGE GIBBON.
THOMAS MOORE.
By Jensen & Son,
77, Chancery Lane, London, W.C.,
Patent Agents.