Improvements in Machines for Grinding, Surfacing, and Polishing Stony and other Material.
Year: 1889

page_text: Date of Application, 23rd Jan., 1889
Complete Specification Left. 23rd Oct., 1889-Accepted, 23rd Nov., 1889
PROVISIONAL SPECIFICATION.
Improvements in Machines for Grinding, Surfacing, and Polishing
Stony and other Material.
I WILLIAM HAY of 46 Tasman Road Stockwell in the County of Surrey Engineer
do hereby declare the nature of this invention to be as follows:-
My invention relates to improvements in machines for grinding surfacing and
polishing stony and other material and it consists of a suitable frame carrying a
central shaft to the inner end of which is mounted a bevil wheel gearing with a
central bevil wheel keyed to a vertical spindle passing therethrough and resting at its
lower extremity upon a suitable bearing.
The upper end of the spindle is cranked and enters a hollow recess centrally formed
in the undersurface of the grinding stone used, this spindle imparting motion to such
stone or material by the intermediary of the above mentioned shaft rotated by hand or
other power.
This said stone or material is aided in its motion by the rotation of several other
similar crank spindles loosely turning in bearings arranged symetrically at the bottom
of the machine and whose upper ends fit into corresponding recesses formed in the
undersurface of the before mentioned grinding stone. When the central spindle
imparts a starting rotary motion to the said stone this motion is taken up by the other
spindles which now rotate & maintain a suitable motion of the stone for grinding
polishing or surfacing purposes.
The stone or material requiring to be ground may be fed over the grinding stone
by means of two endless chains passing over suitable chain wheels actuated by a motor
pulley, or by means of any other suitable arrangement.
1000
HUGHES, SON & Co.,
38, Chancery Lane, W.C., Agents for the Applicant.
HUGHES, SON & Co.,
38, Chancery Lane, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Machines for Grinding, Surfacing and Polishing
Stony and other Material.
I WILLIAM HAY of 46 Tasman Road Stockwell in the County of Surrey Engineer
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:
My invention relates to improvements in machines for grinding, surfacing and
polishing stoney and other material and consists of a suitable frame carrying a central
shaft to the inner end of which is mounted a bevil wheel gearing with a central bevil
wheel keyed to a vertical spindle passing therethrough and resting at its lower extremity
upon a suitable bearing. The upper-end of the spindle is cranked and enters a hollow
recess centrally formed in the undersurface of the grinding stone used this spindle
imparting motion to such stone or material by the intermediary of the above mentioned
shaft rotating by hand or other power. The said stone or material is aided in its
motion by the rotation of several other similar crank spindles turning loosely in
bearings arranged symetrically at the bottom of the machine and whose upper ends
fit into corresponding recesses formed in the under surface of the before mentioned
grinding stone.
In the accompanying drawing Fig. 1 is a plan Fig. 2 a longitudinal section and
Fig. 3 an end view of my improved grinding surfacing and polishing machine.
As shown in the drawing my improved machine consists of lower casting (of iron

page_text: or other suitable metal carrying five crank spindles S, S', S², S³, S₁, in the horizontal
part of which are fixed by bolts or otherwise the pins P, P1, P2, P3, P4, which are
capable owing to this arrangement of being easily lubricated.
Upon the central spindle, S, is mounted a large bevil wheel W gearing with another
smaller bevil wheel w keyed upon the main central shaft A. This shaft which is
supported by suitable bearings 6, b, and carries at its outer end a louse and a fast
pulley Land F respectively is placed longitudinally in the example shewn but it may
be arranged crosswise and at any suitable end of the machine. The five pins P.-
P¹ etc. are free to revolve within recesses 7, 71, 72, 73, 74 formed in the under-
surface of the top and grinding plate G of the machine, which may be made of any
suitable material and is lightened in weight owing to a portion of the metal being cut
out at R, R1, R2, R3, from its upper part. The above recesses are lined with gun
metal or phosphor bronze. A device Dis provided for shifting the driving belt from
one pulley onto the other.
The arrangement of my improved machine can be in the case of stones of large
dimensions be easily inverted so that the grinding plate G may operate on the
top of the stone in which case the lower casting C would have to be conveniently
suspended or supported by suitable standards.
The grinding plato G is provided at two opposite sides with gutters g, g¹, through
which the sand and water used for grinding purposes may be collected and carried
away after they have acted for a sufficiently long time.
In grinding machines hitherto constructed wherein a rotary motion was imparted
to the grinding surface, the tendency of the centrifugal force developed was to drive
to the edges of the said surface, the sand and water or other material used for grinding
purposes, whereas now according to my invention, and in consequence of the peculiar
motion imparted by the crank spindles to the grinding surface the tendency is to
cause on the contrary such grinding material to be evenly distributed all over this
surface and to be retained in such position, this being the chief advantage of my
invention which enables me to grind away a larger quantity of any stoney or other
material in a considerably lesser time than accomplished with revolving grinding
machines such as heretofore constructed.
As shewn in the drawings I have illustrated one method of moving or feeding a
stone upon the grinding surface G. But I do not claim this method exclusively as I
may use any other suitable mechanism for carrying out this motion such method
being only given as illustrative of the manner in which my invention may be carried
into practice.
c¹,
The lower casting C carries four brackets B, B1, B2, B3, upon which are fixed_four
standards 0, 0, 0, 0, supporting in suitable bearings two cross shafts E, E¹. Upon
the outer extremities of each of these shafts are mounted two sprocket wheels F1, F¹,
F, F respectively over which travels the endless chain H, H¹. I is the stone placed
for treatment upon the grinding surface G and is held by two slotted cross bars
each fixed by a headed pin and a nut to one of the links of the chains H, H'.
Longitudinal bars d ' are also used for holding and guiding the stone 1 and are fixed
to the bars cel by bolts and nuts or in any other suitable manner so as to form a
frame therewith. When the stone 1 arrives at either end of the guiding surface G the
motion is reversed.
This may be effected by means of the loose and fast pulleys KK K¹K' keyed on the
shaft H carried by the standards O and actuated by a straight and a cross belt, by
means of three bevil wheels or in any other suitable manner.
The chains are tightened at one end in the following manner-The cross shaft E¹
is mounted in the bearing e capable of sliding to and fro within a slot f formed in
the standard o¹ under the action of the screw threaded rod a fixed thereto and provided
at its outer extremity with a handle j.-By screwing this rod which traverses a
tapped hole of the standard o' in or out with the aid of its handle j the sprocket
wheel can be moved laterally to the right or to the left hand side and the chain can
be correspondingly slackened or tightened.
I have described the motion of the grinding surface G as being carried on by

page_text: means of five spindles but it will appear obvious that I may use a greater number or
cranked spindles set in motion as in the example shown by a central motor spindle ;
or motion may be directly imparted to any of the five spindles.
1 may grind surface or polish every kind of material with my improved machine
from the softest to the hardest whether wood stone or other and I may substitute if
required a crank handle for the motor pulley and work the machine by hand. I may
also replace the large bevil wheel W by a pulley driven directly from the motor.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. In machines for grinding polishing and surfacing the peculiar motion imparted to
the grinding or polishing surface by means of three or more crank spindles actuated by
a motor crank spindle substantially as and for the purpose described.
2. The improved grinding polishing or surfacing machine arranged constructed
and operating either upon the lower or upon the upper surface of the material under
treatment substantially as and for the purpose described.
1300
Datcu Gly
HUGHES, SON & Co.,
38, Chancery Lane, London, Agents for the Applicant.