CERTAIN IMPROVEMENTS IN MECHANISM OR APPARATUS TO BE EMPLOYED FOR GLAZING AND POLISHING PROAL SAWS AND OTHER SIMILAR ARTICLES HAVING FLAT METALLIC SURFACES
Year: 1873

page_text: LETTERS PATENT to John McGregor, of Sheffield, in the County of
York, Engineer, for the Invention of "CERTAIN IMPROVEMENTS IN
MECHANISM OR APPARATUS TO BE EMPLOYED FOR GLAZING AND POLISHING
PROVISIONAL SPECIFICATION left by the said John McGregor at the
Office of the Commissioners of Patents, with his Petition, on the
6th September 1873.
I, JOHN M'GREGOR, of Sheffield, in the County of York, Engineer,
5 do hereby declare the nature of my said Invention for "CERTAIN IM-
PROVEMENTS IN MECHANISM OR APPARATUS TO BE EMPLOYED FOR GLAZING AND
POLISHING SAWS AND OTHER SIMILAR ARTICLES HAVING FLAT METALLIC SURFACES,"
to be as follows:-
The Invention is designed for the purpose of enabling saws or other
งา

page_text: on both sides simultaneously whilst moving in a vertical position between
the peripheries of two revolving polishing wheels.
When at work the novelty of the arrangement produces an action
which facilitates and expedites such processes.
The arrangement of parts comprising these improvements may be
thus described:-Two polishing wheels of the ordinary construction are
mounted, one in fixed and the other in moveable bearings on a base plate
or framing, and in a position that will admit their axes and peripheries to
run either parallel or diagonally with each other. These polishing wheels
are each provided with fast and loose pullies, by which they are driven in
a direction towards and in unison with each other, and in such a manner
that articles submitted to their action will be drawn between them.
The bearings of one of these polishing wheels are securely fixed to the
framing or base plate, and the bearings of the other are allowed to slide
or move thereon so as to extend or diminish the distance between their
peripheries.
The moveable bearings are connected by means of rods (which are
adjustable) with the short end of a bell-crank lever having its fulcrum
firmly secured on the framing or base plate of the machine. The
opposite end of this lever is provided with a weight that counterbalances
the weight of the moveable polishing wheels, and is so arranged that
when in its normal position it will maintain the polishing wheels at their
maximum distance apart. But in order that the position of such
polishing wheels may be adjusted with respect to such distance so as to
act with more or less pressure upon articles submitted to their action, a
treadle lever is provided which is fixed to and projects from the fulcrum
of the lever supporting the counterbalance to a point conveniently placed
that will admit of the attendant or operator acting on the same to
increase or diminish the pressure of the polishing wheels when at work
upon the articles submitted to their action. In a central position above
the axes of the polishing wheels there is a vertical sliding bar in bearings
that will admit of its moving in a perpendicular direction, a distance
corresponding to the greatest length of saw or other article to be acted
upon by the polishing wheels. The lower portion of this sliding bar is
provided with grips or locking levers that will hold firmly and admit of
the ready attachment thereto or detachment therefrom of the article or

page_text: articles to be acted upon. The sliding movement given to this bar is
obtained through the medium of a rod connected to a slotted crank, the
adjustment of such connection in the slot of the crank nearer to or
farther from its centre regulates the amount of throw given to the bar
so as to make its rise and fall correspond with the length of articles
submitted to the polishing action of the wheels.
A box supplied with emery or other polishing material is supported in
a position near the junction of the polishing surfaces of the wheels.
The box is provided with an aperture covered with a lid or valve which
is in connection with a cam or eccentric attached to the crank shaft
through the medium of a connecting rod and lever.
The intermittent opening and closing of this lid or valve, which can
be regulated by the cam, governs the flow of the polishing material
therefrom in a manner that enables it to be fed to the articles under
process of polishing as the same may be required.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John McGregor in the Great Seal Patent Office on
the 6th March 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
MCGREGOR, of Sheffield, in the County of York, Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixth day of September, in the year
of our Lord One thousand eight hundred and seventy-three, in the
thirty-seventh year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said John McGregor, Her
special licence that I, the said John McGregor, my executors, admini-
strators, and assigns, or such others as I, the said John McGregor,
my executors, administrators, and assigns, should at any time agree
with, and no others, from time to time and at all times there-
after during the term therein expressed, should and lawfully might

page_text: make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
for "CERTAIN IMPROVEMENTS IN MECHANISM OR APPARATUS TO BE EMPLOYED
FOR GLAZING AND POLISHING SAWS, AND OTHER SIMILAR ARTICLES HAVING FLAT
METALLIC SURFACES," upon the condition (amongst others) that I, the said t
John McGregor, 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 1
months next and immediately after the date of the said Letters
Patent. .
NOW KNOW YE, that I, the said John McGregor, 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 1
by the following statement and accompanying Drawings, that is to
say:―
The Invention is designed for the purpose of enabling saws or other
metallic articles having similar flat surfaces to be glazed and polished
on both sides simultaneously, whilst moving in a vertical position 2
between the peripheries of two revolving polishing wheels.
When at work the novelty of the arrangement produces an action
which facilitates and expedites such processes.
The arrangement of parts comprising these improvements may be
thus described :-Two polishing wheels of the ordinary construction are 2
mounted one in fixed and the other in moveable bearings on a base
plate or framing, and in a manner that will admit their axës and
peripheries to run either parallel or diagonal with each other. These
polishing wheels are each provided with fast and loose pullies by which
they are driven by the prime mover in a direction towards and in unison 3
with each other, and in such a manner that articles submitted to their
action will be drawn between them. The bearings of one of these polishing
wheels are securely fixed to the framing or base plate, and the bearings
of the other are allowed to slide and swivel thereon, so as to extend or
diminish the distance between their peripheries either parallel with each 3
other or obliquely if required.

page_text: The
The movable bearings are connected by means of rods (which are.
adjustable) with the short end of a bell-crank lever having its fulcrum
firmly secured on the framing or base plate of the machine.
opposite end of this lever is provided with a weight that counterbalances
the weight of the moveable polishing wheel, and is so arranged that when
it its normal position it will maintain the polishing wheels at their
maximum distance apart. But in order that the position of such
polishing wheels may be adjusted with respect to such distance so as to
act with more or less pressure upon articles submitted to their action, a
treadle lever is provided which is fixed to and projects from the fulcrum
of the lever supporting the counterbalance to a point conveniently
placed that will admit of the attendant or operator acting on the same,
to increase or diminish the pressure of the polishing wheels when at work
upon the articles submitted to their action. In a central position above
the axes of the polishing wheels there is a vertical sliding bar in bearings
that will admit of its moving in a perpendicular direction, a distance
corresponding to the greatest length of saw or other article to be acted
upon by the polishing wheels. The lower portion of this sliding bar is
provided with grips or locking levers that will hold firmly, and admit of
the ready attachment thereto or detachment therefrom of the article or
articles to be acted upon. The sliding movement given to this bar is
obtained through the medium of a rod connected to a slotted crank, the
adjustment of such connection in the slot of the crank nearer to or
further from its centre regulates the amount of throw given to the bar,
so as to make its rise and fall correspond with the length of articles
submitted to the polishing action of the wheels. This crank is driven
from the prime mover and receives the intermittent motion necessary
through a clutch box actuated by a lever within easy reach of the
attendant who can throw the clutch in and out of gear, and thus put the
sliding bar in motion or allow it to remain stationary as required.
A box supplied with emery or other polishing material is supported
in a position near the junction of the polishing surfaces of the wheels.
The box is provided with an aperture covered with a lid or valve which
is in connection with a cam or eccentric attached to the crank shaft
through the medium of a connecting rod and lever.
The intermittent opening and closing of the lid or valve can be
regulated by the cam which governs the flow of the polishing material

page_text: in a manner which enables it to be fed to the articles under process of
polishing as the same may be required.
In order that the Invention may be better understood and explained
in detail, I have hereunto annexed a Sheet of Drawings, similar letters
of reference being marked on corresponding parts on all the Figures
alike.
Fig. 1 represents a front elevation of the polishing machine;
*Fig. 2, an end elevation of the same, and Fig. 3, a plan of the polishing
'wheels and their driving and actuating mechanism. The parts holding
and presenting the saws or other flat articles to the action of the
polishing wheels are not shewn in this view.
In Figs. 1, 2, 3, a, a, is the base plate or bed of the machine upon
which the two polishing wheels b, 61, of ordinary-construction are
mounted; the wheel has its bearings fixed to the base plate a, and the
wheel has its bearings moveable thereon. The position of the
· wheels b, b¹, relative to each other is such that their axes and peripheries
⚫ will run either parallel or diagonally together when driven by the
pullies c, c', with which each wheel is independently supplied. The
driving of the wheels is in a direction towards and in unison with each
other, as shewn by the arrows in Fig. 1, and in a manner that articles
submitted to their action would be drawn between them. The
bearings 6², 6ª, of the wheels 6¹ are connected by means of the rods d, d,
with the slotted ends e, c, of the levers e¹ and e³, the connection of such
rods with the levers e¹ and e² being adjustable in the slots e, e, through
the medium of the sliding nuts e³, e³, and screws e³, e*. These levers e¹
and e² are supported on one common fulcrum forming the shaft f, sup-
ported in fixed bearings firmly secured to the base plate a.
To the
fulcrum end of the shaft fon which the lever e¹ is fixed the lever g is
. secured in a position that forms a bell crank with the lever e¹. On the
end of this lever g is securely mounted the weight g¹ which counter-
'balances the weight of the moveable polishing wheel 6', the weight of
which is so adjusted that when in its undisturbed or normal position it
will maintain the said polishing wheel at its maximum distance from
the fixed wheel b; but in order that the position of such polishing
wheels may be adjustable with respect to such distance so as to act with
more or less pressure upon articles submitted to their action, a treadle

page_text: is provided which is fixed to and projects from the shaft fat a point
situate immediately outside the fulcrum of the slotted lever e³. This
treadle extends from the fulcrum shaft f to a point which will admit of
the foot of the attendant acting on the same so as to bring the wheels to
the required distance, and to increase or diminish the pressure of the
polishing wheels when at work upon the articles submitted to their
action. In a central position above the axis of the polishing wheels b
and the vertical sliding bar / is supported in the bearings 1, 1, by
means of the connecting rod m which is attached to the slotted balance
lever n.
The bark has transmitted to it a rising and falling motion
through the medium of the connecting rod m, slotted lever n, and
actuating wheels o; the extent of throw given to the bar / being
adjusted by the position of the connection of the rod m in the slot of
the lever n. The lower portion of the sliding bark is provided with
grips or locking levers p, p, which will firmly hold the article or articles
to be acted upon, and admit of the ready attachment thereto or detach-
ment therefrom; the adjustment of the rise and fall to be given to
such articles, being regulated by the adjustment and fixing of the con-
necting rod m in the slot of the lever n. The boxes 2, 9', supplied with
emery or other polishing material is supported in a position near the
junction of the polishing surfaces of the wheels. These boxes are pro-
vided with an aperture covered with a lid or valve which is connected
by the rod with the cam or eccentric &¹ attached to or fixed on the
crank shaft t. The intermittent motion of the bar k is produced by the
action of the lever r¹ and clutch s (Fig. 2), which is within easy reach
of the attendant's hand, who can throw the clutch in gear, and so put
the sliding bar in motion, or by throwing the clutch out of gear leave
the bar at rest in the position required for attaching or detaching the
articles requiring to be polished. The intermittent opening and closing
of the emery boxes, lids, or valves through the medium of this con-
nection can be regulated by the cam s¹ so as to govern the flow of the
polishing material from the boxes q, q', in a manner which enables it to
be fed to the articles under process of polishing, or entirely stopped as
the same man ho vocuinad

page_text: ment, and adaptation of adjustable polishing wheels, together with the
mechanism in connection therewith, to be employed for the purpose of
polishing and glazing flat metallic articles, in the manner as herein.
before substantially described, set forth, and fully illustrated in the
Drawings annexed.
In witness whereof, I, the said John McGregor, have hereunto set
my hand and seal, this Twenty-eighth day of February, in the
year of our Lord One thousand eight hundred and seventy-
four.
JOHN MCGREGOR. (L.S.)
Witness.
RICHARD HOWE,
Olerk to Messrs. Holmes & Johnson,
7, St. James Row,
Sheffield..