IMPROVEMENTS IN MACHINERY OR APPARATUS FOR GRINDING AND POLISHING
Year: 1879

page_text: LETTERS PATENT to Joseph Burdekin Jackson, of Sheffield, in the County of
York, for the Invention of "IMPROVEMENTS IN MACHINERY OR APPARATUS
FOR GRINDING AND POLISHING."
Sealed the 4th May 1880, and dated the 5th November 1879.
PROVISIONAL SPECIFICATION left by the said Joseph Burdekin Jackson
«
at the Office of the Commissioners of Patents on the 5th November 1879.
JOSEPH BURDEKIN JACKSON, of Sheffield, in the County of York. IMPROVE-
MENTS IN MACHINERY OR APPARATUS FOR GRINDING AND POLISHING."
My Invention relates to machinery or apparatus for grinding and polishing flat
surfaces of every description, also articles of a curved or irregular shape having a
plane or flush surface.
In carrying out my Invention I employ a grindstone or polishing wheel mounted
on a shaft or axis in suitable bearings, which are capable of being adjusted by
means of screws and worm wheels so as to raise or lower the grindstone or polishing
wheel, in order to compensate for wear or regulate its position to suit the exigencies
of different kinds of work. Below the grindstone or polishing wheel is arranged a
table or bed, upon which is secured the article to be operated upon. This table or
bed is carried upon two grooved or flanged wheels mounted on a shaft or axis
supported so as to be capable of revolving in bearings in the frame of the apparatus,
suitable projections or recesses being provided on or in the table or bed for engaging
with the grooves or flanges of the wheels. To the table or bed is imparted a
reciprocating to and fro motion by means of a crank disc, crank pin, and connecting
rod, which latter is attached at its inner end to a sliding rod, which is also secured
to the table or bed by an adjustable connection so as to admit of the stroke of the
rod being varied, and of the operation being performed at any part of the table or
bed as required.
The motion of the crank disc is derived by preference by means of friction gearing
and a belt and pulleys from any suitable prime mover.
The shaft carrying the grindstone or polishing wheel is also driven by a belt
and pulleys from such prime mover, and to the said shaft is further imparted an
end motion so as to ensure uniformity of wear in the grindstone or polishing wheel

page_text: in the following manner-On the shaft is loosely mounted a sleeve, which is driven
by means of a belt and pulleys from the shaft carrying the crank disc, so as to
revolve at a different speed from the shaft on which the grindstone or polishing
wheel is mounted, whilst at the same time the sleeve is so connected to the latter
shaft as to cause the same to partake of any end motion which may be imparted to
the sleeve. In the sleeve is formed a cam groove, with which engages a fixed pin
arranged in such a manner that as the sleeve revolves the pin causes the same to
move longitudinally, and thus communicate the required traversing motion to the
grindstone or polishing wheel.
A dish is formed in the bed plate of the machine for catching and retaining
water.
By means of my Invention files, chisels, plane irons, and other like articles may
be ground with greater rapidity and accuracy than is attainable with the ordinary
hand process.
By making the projections or recesses in the table or bed which gear with the
grooved or Bunged wheels of a suitable shape the apparatus is adapted for operating
upon articles of any required curved or irregular form having a plane or flush
surface.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Joseph Burdekin Jackson in the Great Seal Patent Office on the 4th
May 1880.
JOSEPH BURDEKIN JACKSON, of Sheffield, in the County of York. "IMPROVE-
MENTS IN MACHINERY OR APPARATUS FOR GRINDING AND POLISHING."
My said Invention relates to machinery or apparatus for grinding and polishing
flat surfaces of every description, also articles of a curved or irregular shape having
a plane or flush surface.
This machinery or apparatus is constructed in the following manner, reference
being had to the several Figures on the two Sheets of Drawings hereunto
annexed:-
Figure 1 (Sheet 1) of the accompanying Drawings represents a side sectional
elevation of the machine; Figure 2 (on Sheet 2) is an end elevation, partly in
section, of the same; and Figure 3 is an end view of a portion of the apparatus for
imparting motion to the table or bed herein after referred to. The same letters of
reference indicate corresponding parts in all the Figures.
In carrying out my said Invention I employ a grindstone or polishing wheel A
mounted on a shaft or axis B in suitable bearings C, C, which are capable of being
adjusted along guides C¹, C', by means of screws and worm wheels (not shewn in
the Drawing) so as to raise or lower the grindstone or polishing wheel A in order
to compensate for wear or regulate its position to suit the exigencies of different
kinds of work. Below the grindstone or polishing wheel is arranged a table or
bed D, upon which is to be secured the article to be operated upon, or the same
may be secured to a separate and independent bed attached to the said table. The
table or bed D is carried upon two grooved wheels E, E, mounted on a shaft or
axis a, supported so as to be capable of revolving in bearings at b, b, in the frame F
of the apparatus, suitable projections c, c, being provided on the table or bed D for
engaging with the grooves of the wheels E, E. To the table or bed D is imparted
a reciprocating to and fro motion by means of a crank disc G, crank pin d, and
connecting rod H; the latter is attached at its inner end to a rod I, which is sup-
ported so as to be capable of sliding in a bearing I', and is also secured to the table
or bed D by an adjustable connection at e, so as to admit of the stroke of the rod I
being varied, and of the operation being performed at any part of the table or bed D
as required.
The crank disc G, which is mounted upon a shaft K supported in bearings f, f,
derives its motion by preference by means of friction gearing (one of the wheels of
which is shewn at L in Figure 3), and of a belt and pullys from any suitable prime
mover.
The shaft B carrying the grindstone or polishing wheel A is also driven by a
belt and pulleys from such prime mover (one of the pulleys being shewn at M), and
to the said shaft is further imparted an end motion so as to ensure uniformity of
wear in the grindstone or polishing wheel in the following manner :-On the shaft B
is loosely mounted a sleeve N, which is driven by means of a pulley O, a belt and
a pulley P from the shaft K carrying the crank disc G so as to revolve at a different
speed from the shaft B, on which the grindstone or polishing wheel A is mounted,
whilst at the same time the sleeve N is so connected to the latter shaft as to cause
the same to partake of any end motion which may be imparted to the sleeve. In
the sleeve N is formed a cam groove g, with which engages a fixed pin (not shewn
in the Drawing) arranged in such a manner that as the sleeve revolves the pin
causes the same to move longitudinally, and thus communicate the required
traversing motion to the grindstone or polishing wheel.
A dish Qis formed in the bed plate of the machine for catching and retaining
water,

page_text: In operating with this apparatus motion is imparted to the grindstone or polishing
wheel A, the sleeve N, and the table or bed D by the means hereinbefore described.
The grindstone or polishing wheel A is thus caused to revolve whilst at the same
time receiving an end traversing motion in the line of its axis, and the table or
bed D carrying the article to be operated upon is moved to and fro beneath the
grindstone or polishing wheel A thus actuated. The article under operation is thus
ground or polished with facility, accuracy, and despatch.
It is obvious that flanged wheels may be substituted for the grooved wheels E, E,
the table or bed D being in this case formed with recesses in lieu of with the
projections c, c.
It should be observed that the projections or recesses on the under side of the
table or bed D, which engage with the grooves or flanges of the carrying wheels
E, E, are made to correspond in their longitudinal contour with the shape of the
surface to be operated upon of the article to be ground or polished. For example,
for grinding or polishing articles the surface of which to be operated upon is convex,
the projections or recesses should be made concave in their longitudinal contour,
and the article should be secured to the upper side of the table or bed in such a
position that as the table or bed is moved to and fro over the wheels E, E, every
portion of the convex surface of the article to be operated upon will be uniformly
presented to the action of the grindstone or polishing wheel A just as if the surface
of the article were flat. The apparatus is thus adapted for grinding or polishing
articles, the surface of which to be operated upon is of any curved or irregular form,
provided that such articles have also a surface which is capable of being adapted to
the upper side of the table or bed. Among other articles for operating upon which
the Invention is applicable may be enumerated files, chisels, plane irons, and the
like, which may be thus ground with greater rapidity and accuracy than is
attainable with the ordinary hand process.
Having now described and particularly ascertained the nature of my said Inven-
tion, and the manner in which the same is or may be used or carried into effect, I
would observe in conclusion that what I consider to be novel and original, and
therefore claim as the Invention secured to me by the herein before in part recited
Letters Patent is,―
The general arrangement and combination of parts constituting machinery or
apparatus for grinding and polishing, substantially as hereinbefore described and
illustrated in the accompanying Drawings.
In witness whereof, I, the said Joseph Burdekin Jackson, have to this my
Specification set my hand and seal, this Third day of May, One thousand
eight hundred and eighty.
JOSEPH BURDEKIN JACKSON.
(L.S.)