A New or Improved Tool and Attachment for Truing Up Grindstones and for Grinding Tools thereon.
Year: 1892

page_text: Date of Application, 1st Dec., 1892
Complete Specification Left, 1st Sept., 1893-Accepted, 11th Nov., 1893
INOVIDIONAL DI PUITIVATION
A New or Improved Tool and Attachment for Truing Up Grindstones
and for Grinding Tools thereon.
We, JOHN JAMES ROYLE of Dalham Works, Great Bridgewater Street,
Manchester, Engineer, and FRANCIS MAYNE of Pearson Street, Queen's Road,
Manchester, Engineer, do hereby declare the nature of our said invention to be as
follows:-
Our improvements relate, first, to a new or improved tool for truing or turning
up grindstones in combination with an attachment or rest fixed to the stone trough
which constitutes the ordinary support on which to sharpen tools, but by the
addition of a lower transverse bar also forms a rest or support on which to operate
our improved truing up tool.
In accordance with our improvements we take a length of steel or iron tubing
and near the working end thereof we affix a collar or pair of collars which are so
adjusted on the tube that it or they can act as a guide to the said tube when rolled
along the special transverse bar aforesaid of the ordinary tool rest.
In practise we prefer a single collar by preference a split steel ring which is
made a "driving fit on the tube so that the adjustment can be effected by
slightly tapping it with a hammer or the collar may be a slack fit adjusted by set
screws.
In truing up a grindstone with the tool rest before described the collar or collars
are first adjusted in relation to the face of the stone and the lower rest, the tool is
then held against the stone and slowly rotated along the special rest aforesaid, the
collar or collars, guiding the cutting edge of the pipe uniformly across the face of
the stone, ensuring accuracy of turning.
By means of this tool and rest the truing up of the stone is much simplified and
rendered a less skilled operation than heretofore enabling a stone to be "kept " up
with ease and facility.
I provide a similar rest or attachment to guide the turning tool across the side
of the stone when required to enable the side of the stone to be used for facing up
and renewing flat objects such as oil stones, used by joiners, and other similar flat
surfaces.
The second part of my invention relates to an attachment to the back part of
the stone for facilitating the grinding of tools thereon and consists of an upper and
lower rest, one over the other, adjusted close to the stone and bevilled at the edge
near the stone so that a tool such as a chisel thrust in between the stone and the
upper rest can be ground to a definite angle, whilst a tool such as a plane iron
thrust in between the lower rest and the stone and allowed to lie against the under
side of the upper rest is ground to a more acute angle suitable for such tool.
The rest may be adjustable in height to vary the angle of the cutting edge.
D: 20th dow of Nanombor 1909
JOHN G. WILSON,
Agent for the Applicants

page_text: COMPLETE SPECIFICATION.
A New or Improved Tool and Attachment for Truing Up Grindstones
and for Grinding Tools thereon.
We, JOHN JAMES ROYLE of Dalham Engineering Works, Great Bridgewater
Street, Manchester, Engineer, and FRANCIS MAYNE of Pearson Street, Queen's
Road, Manchester, Engineer, do hereby declare the nature of our said invention
and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement :-
Our improvements relate, first, to a new or improved tool for truing or turning
up grindstones in combination with an attachment or rest fixed to the stone trough
which constitutes the ordinary support on which to sharpen tools, but by the
addition of a lower transverse bar also forms a rest or support to operate our
improved truing up tool.
On the accompanying drawing
Fig. 1 illustrates a side elevation of a grinding stone with our improved fittings
applied thereto and Figs. 2 and 3 are right and left hand end views respectively.
Fig. 4 illustrates our improved truing up tool.
Figs. 5 to 7 are detail views of a larger scale.
In accordance with the first part of our improvements we take a length of steel or
iron tubing A and near the working end thereof we affix a collar or pair of collars
which is or are so adjusted on the tube that it or they can act as a guide to said
tube when rolled along the special transverse bar C aforesaid of the ordinary tool
rest E (see sectional view Fig. 6) the top edge of the said bar taking between the
two collars or the front face of the single collar abuting against the bar.
In practise we sometimes use a single collar by preference a split steel ring F
(see Fig. 4) which is made a "driving "fit on the tube so that the adjustment can
be effected by slightly tapping with a hammer or the collar may be a slack fit
adjusted or fixed by set screws.
A tool so made up forms a highly suitable means of truing up a grind-stone and
is considerably cheaper than any of the devices at present in use for this purpose.
In truing up a grind-stone the collar is first adjusted in relation to the face of the
stone and the transverse bar, said collar being either caused to diminish or increase
its distance from the working end on the tube according as the condition of the
stone may require. The working end of the tube is then caused to bear against the
stone and the tube is slowly rotated along the special rest C the collar guiding
the cutting edge of the pipe uniformly across the face of the stone and thus
ensuring accuracy of turning.
By means of this tool and rest the truing up of the stone is much simplified and
rendered a less skilled operation than heretofore, enabling a stone to be "kept up"
with ease and facility.
To facilitate the manipulation of the tube in rolling it along the transverse bar C
we provide a handle H fitting into the end of the tube A as seen more clearly in
Fig. 4, and it will be readily seen that the said handle may be fitted to fresh tubes
from time to time as they become worn away. We may provide a similar rest or
attachment to guide the truing tool across the side of the stone to enable the side
of the stone to be trued up and used for facing up such objects as oil-stones (used
by joiners) and other similar flat surfaces.
In lieu of a single collar or two separate collars we may employ a bobbin I (see
or tube.
Fig. 5) either fixed by set screw Jast screwed onto the such relates to an attach-
ment to the back of the stone for facilitating the grinding of tools thereon we
employ the double or compound form of rest seen more clearly in sectional view
Fig. 7 consisting of an upper rest K and lower rest L arranged one above another
as illustrated, adjusted close to the stone and both rests bevilled at the edge near

page_text: the stone so that a tool such as a chisel M thrust in between the stone and the upper
rest can be ground to a definite angle, whilst a tool such as a plane iron N thrust in
between the lower rest and the stone and allowed to lie against the upper rest at O
is ground to a more acute angle suitable for such tool.
Having thus 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.
1st. For truing up grind-stones the use and employment of a tube A fitted with
a collar or collars or their equivalent in combination with a transverse bar by
preference fitted to an ordinary grind-stone rest, and mounted and operating
substantially as hereinbefore described and illustrated on the accompanying
drawing.
2nd. The use and employment of the double or compound back rest (see Fig. 7)
arranged and mounted substantially as and for the purposes hereinbefore set forth.
Dated this 31st day of August 1893.
JOHN G. WILSON & Co.,
Agents for the Applicants.