IMPROVEMENTS IN MACHINERY FOR GRINDING AND POLISHING METAL AND OTHER SURFACES
Year: 1867

page_text: LETTERS PATENT to William Gregory, of the Township of Ardwick, in
the County of Lancaster, Machinist, for the Invention of "IMPROVEMENTS
IN MACHINERY FOR GRINDING AND POLISHING METAL AND OTHER SURFACES."
Sealed the 11th October 1867, and dated the 13th April 1867.
PROVISIONAL SPECIFICATION left by the said William Gregory at the
Office of the Commissioners of Patents, with his Petition, on the 13th
April 1867.
I, WILLIAM GREGORY, of the Township of Ardwick, in the County o
Lancaster, Machinist, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN MACHINERY FOR GRINDING AND POLISHING METAL AND OTHER
SURFACES," to be as follows:-
I apply to ordinary revolving grinding and polishing apparatus a feeding
apparatus formed as follows, that is to say :-I place on each side of the
apparatus a frame adjustable by screws suitably placed therein, and I mount
pullies which carry endless chains in line with the surface of the grinding or
polishing stone, wheel, or glazier, having snugs or dogs so placed thereon that
when the material to be ground or polished is placed upon them the snugs or
dogs will draw it forward by the motion of the chains.
Motion is imparted to the chains above described by means of suitable
geering, which receives motion from a friction or brush wheel working against

page_text: the side of the grinding or polishing stone, wheel, or glazier; by this arrange-
ment it is evident that the rate of feed will be varied as the grinding appa-
ratus decreases in size, and be in accordanco with the surface velocity thereof.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Gregory in the Great Seal Patent Office on the
12th October 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
GREGORY, of the Township of Ardwick, in the County of Lancaster, Machinist,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirteenth day of April, in the year of our Lord
One thousand eight hundred and sixty-seven, in the twenty-ninth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said William Gregory, Her special licence that I, the said William Gregory,
my executors, administrators, and assigns, or such others as I, the said
William Gregory, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make, use,
exercise, and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
MACHINERY FOR GRINDING AND POLISHING METAL AND OTHER SURFACES," upon the
condition (amongst others) that I, the said William Gregory, my executors
or administrators, by an instrument in writing under my, or their, or one of
their hands and seals, should particularly describe and ascertain the nature
of the said Invention, and in what manner the same was to be performed,
and cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said William Gregory, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
I apply to ordinary revolving grinding and polishing apparatus a feeding
apparatus formed as follows, that is to say:-I place on each side of the
apparatus a frame adjustable by screws suitably placed therein, and I mount
pullies which carry endless chains in line with the surface of the grinding or

page_text: polishing stone, wheel, or glazier, having snugs or dogs so placed thereon that
when the material to be ground or polished is placed upon them the snugs or
dogs will draw it forward by the motion of the chains.
Motion is imparted to the chains above described by means of suitable
gearing, which receives motion from a friction or brush wheel working against
the side of the grinding or polishing stone, wheel, or glazier; by this arrange-
ment it is evident that the rate of feed will be varied as the grinding
apparatus decreases in size, and be in accordance with the surface velocity
thereof.
And in order that my Invention may be more fully understood and more
readily carried into effect, I will now proceed to describe the same, reference
being made to the accompanying Drawings, and to the letters and figures
marked thereon.
Figure 1 is a side elevation of a grinding stone having my Invention
applied thereto; Figure 2 is a front elevation of a grinding stone having my
Invention applied thereto.
A is the grinding stone trough; B, B', are the bearings therein in which
the shaft C revolves; on this shaft is fastened the pulley H and its corre-
sponding loose pulley H. The grinding stone D is fastened in the usual
manner by means of the plates or washers F and the nut G. The framing L
having a series of small rollers for carrying the work when ground horizontal
or nearly so, according to the will of the grinder using the same, is carried
upon the screw pillars a, a, a, a, by means of the bevil wheels b, b₁, b, b³,
serewed internally to fit them. This framing on each side is constructed with
a shelf L, L, running nearly its entire length, the form of which is best seen
in Figure 2; upon this shelf slide the cross bar or bars c, by which the
work dis pushed forward against the stone, as herein-after described. At
one end of the framing is placed the shaft e, having the chain pullies e', e,
thereon; this shaft may be made adjustable so as to keep the chain of a
uniform tension. At the other end of the framing is placed in suitable
bearings the shafts d, on which are fastened the driving chain pulleys d', d².
The chains f, f, are placed on the pulleys above described, one on each side
of the framing L, as shewn in Figure 2; they are furnished at suitable
distances with projecting links or dogs against which the bars C by which the
work is pushed forward take, and from which they receive their motion
forward. On the end of one of the shafts d is fastened the wheel & gearing
with the pinion d on the stud d', and having fastened to it the wheel d
gearing with the pinion d on the worm wheel do on the stud d". The worm
wheel gears with the worn d on the shaft d in the socket d. On the

page_text: other end of the shaft d¹s is fastened the wheel d¹s which gears with the
pinion d on the stud d fastened in an arm v₁ concentric with the socket d.
On the boss of the pinion d is fastened the friction pulley v adjusted to press
suitably on and receive motion from the grinding stone D by the adjustable
arm above described, and best seen in Figure 1. By this friction pulley
and the series of wheels and pinions above described motion is conveyed to
the chains f,f, from the grinding stone. In the framing L are two upright
slots L³ seen in Figure 1, in which are placed two moveable bearings fastened
to the cross bar i, being adjusted by the hand screws,, in the cross head
These hand screws are shewn distinct as the work may sometimes require to
be bevilled towards one edge, but they may be worked together when plane
work is required to be done. In the bearings on the cross bar i above
described the shaft of the pressure roller rotates and reciprocates; it rotates
by the action of the work upon it on which it presses, and it reciprocates by
means of a cam k fastened on it, whose zig-zag edge takes into the notch k¹
cast or bolted on the bar i, and as it is rotated is caused thereby to have a
reciprocating motion which it transmits to the work upon the stone. The
ultimate thickness of the work being ground is determined by the position of
this pressure roller, but it is built in several sections, both longitudinally and
radially, to allow a slight yielding to take place as inequalities in the work
pass under it. On the shaft of the roller is placed a tube having a series of
elastic rings drawn tightly upon it, and placed close together so as to form an
elastic bed. On the outside of these elastic rings are placed the outer metallic
rings which form the surface of the roller; this roller is seen part in section
and part complete in Figure 2. When the work reduces the stone's diameter,
and thereby alters the conditions of pressure, the framing L requires to be
lowered accordingly. The bevil wheels band b' are geared with the bevils b', 65,
fastened on the shaft b, whilst the similar bevils 63, 6, are geared with the
bevils 7, fastened on the shaft bº. Underneath the frame the shaft 610 is
supported on suitable bearings, having on it two worms 61, 612, gearing with
two worm wheels 613, 61, fastened on the shafts & and respectively; there
is also fastened on the shaft the hand pulley 3, by turning which in the
proper direction by means of the train of wheels above described the entire
frame is lowered upon the pillars, carrying with it the pressure roller and the
friction pulley above described, and thus maintaining the conditions of pressure
and of the progress of the work to the varying diameter of the stone. I desire
specially to observe that I use the screws ¹, 23, only for the purpose of
determining the thickness of the work, the velocity of the stone and the
progress of the work being properly conditioned to cach other; but when the

page_text: stone is reduced in diameter and the conditions of the velocity of the stone
and the progress of the work to each other are thereby altered, I use the
screwed bevils and pillars for readjusting them to each other; and whatever
alterations may be made in the forms of the parts, so long as these conditions
are included, I regard such forms and modifications as only modifications of
my Invention.
My Invention may also be applied as described to other work than
grinding, with such alterations as are obvious to any mechanic conversant
therewith.
Having thus described the nature of my Invention and the manner in
which the same is to be performed, I declare that I claim,-
Firstly, the adjustable frame as described and shewn.
Secondly, the friction pulley, by the adjustment of which the work is made
to pass at a proper rate on to the grinding stone or polishing apparatus.
Thirdly, the chains with the inserted catch, links, or dogs, and the cross
bars, by which the work is pushed forward.
Fourthly, the pressure roller as described and shewn with its adjusting
screws and internal elastic padding, together with the motions which it receives
from the work, and cross motion it re-transmits thereto.
In witness whereof, J, the said William Gregory, have hereunto set my
hand and seal, this Tenth day of October, in the year of our Lord
One thousand eight hundred and sixty-seven.
Witness,
WILLIAM ROBERTSON,
Engineer and Patent Agent,
17, Queen's Chambers,
Market Street,
Manchester.
W. GREGORY. (L.S.)