An Improved Sanding and Polishing Apparatus for Stone.
Year: 1895

page_text: Date of Application, 16th Mar., 1895
¡omplete Specification Left, 16th Dec., 1895-Accepted, 18th Jan., 1896
PROVISIONAL SPECIFICATION.
An Improved Sanding and Polishing Apparatus for Stone.
We, HERBERT JOHN STEPHENS of 116, Fore Street, Exeter, Builder, and
RICHARD WALTER MARDLES of 31, Pinhoe Road, Heavitree, near Exeter,
Stone Mason, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved apparatus for sanding and polishing plain
or straight moulded work in hard stone, and has for its object to provide a
simple and effective arrangement for this purpose, which will be inexpensive in
manufacture.
In carrying out our invention a cast iron frame of rectangular or other shape is
employed, the under surface of which is formed with a series of longitudinal dove-
tailed grooves. At each corner of this frame is cast a lug formed with an eye,
and to these lugs slings are attached. The slings are hung from a chain at the
centre of the frame, and the chain passes over a pair of pulleys carried by posts
or supports at short distances above the apparatus. To the other end of this chain
a weight is connected, the weight varying according to the size of the stone that
is being treated, and serving to raise the sander off the stone when finished.
At the centre of the frame on the upper side, a transverse rib is cast, bored to
receive a stout pin forked, bolted or otherwise fixed on the end, and the driving
shaft is attached to this pin and serves to actuate the sanding apparatus. The
driving shaft may be attached to a disc or crank or to the end of a saw frame, or
other apparatus which will give the necessary reciprocating motion.
The sanding irons are fitted to the frame by means of the dovetailed slots above
mentioned, the irons being formed with dovetailed ribs on top to fit into the slots.
For plain sanding or polishing a flat grating is employed, screwed to the frame
to keep it in place. For sanding or polishing moulded work, four guides are
employed two at each side of the frame, which ensures the latter moving in a
straight line. These guides consist of slotted bars and are moved between strong
standards or posts which keep the apparatus in position. The irons are moulded
to the shape of the stone, and are attached to the underside of the frame in the
manner above described, the iron being perforated to allow the sand and water to
pass through.
With this apparatus as the frame is swung centrally, a perfectly level surface is
ensured, the driving power being also supplied from the centre.
Dated this 15th dor of March 1895
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicants.
COMPLETE SPECIFICATION.
An Improved Sanding and Polishing Apparatus for Stone.
We, HERBERT JOHN STEPHENS of 116, Fore Street, Exeter, Builder, and
RICHARD WALTER MARDLES of 31, Pinhoe Road, Heavitree, near Exeter,
Stone Mason, 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 :--
This invention relates to an improved apparatus for sanding and polishing plain

page_text: or straight moulded work in hard stone, and consists of a rectangular or other
shaped iron frame, the under surface of which is formed with a series of longitudinal
dovetailed grooves for receiving dove-tailed ribbed sanding irons, or the latter may
be fixed to the frame by screw bolts fitting into slots formed in grooved bars
screwed to the frame. Lugs are formed at each corner of the frame to which
slings are attached and which are suspended from a beam hooked to a chain or
wire rope passing over guide pulleys carried by a beam overhead, the other end of
the chain or rope being provided with weights to assist the raising of the frame
from off the stone. Lugs are formed at the centre of the frame on each side for
receiving a stout pin to which are pivoted the forked ends of a driving shaft
attached by a gab to a disc or crank, or to the travelling frame of a steam saw
whereby a longitudinal movement is given to the aforesaid frame. The frame is
provided with guides which travel along angle-iron runners supported by four
vertical screwed rods carried in bearings fixed to vertical beams or supports. To
the upper ends of these rods are fixed bevel wheels gearing with other bevel
wheels, attached to a horizontal shaft supported by the vertical beams, one to each
pair of screwed rods. Each of these shafts is provided with a handle for adjusting
the height or inclination of the frame.
In the accompanying sheet of drawings Fig. 1 is a side elevation of my improved
apparatus and Fig. 2 is a plan thereof. Fig. 3 is a plan of the sanding irons and
grooved bars, and Figs. 4, 5 and 6 are details.
a represents the rectangular frame to which the sanding or polishing irons bare
attached. a are the lugs at each corner of the frame to which the slings care
attached. These slings are suspended from the beam d hooked at its centre to the
rope e running over guide pulleys carried by the overhead beam g and provided
with weights e¹ at its free end. hh are the lugs formed on each side of the frame
at its centre through which pass stout pins to which are pivoted the forked ends i¹
of the driving shaft or rod i. To each corner of the frame are attached the
guides whose outer ends bear upon angle-iron runners / supported by the adjusting
screws m carried in bearings m' fixed to the vertical beams g¹. These screws are
provided at their upper ends with the bevel wheels m³ gearing with other hevel
wheels m² carried by the horizontal shafts 3 supported by the beams gl and provided
with handles for turning the said shafts for adjusting the height or inclination of
the frame a.
The sanding irons b are placed at an angle with the bars 6' to which
they are attached by screw bolts 2 as shown in plan and end view Figs. 3 and 4,
the said bars being screwed to the underside of the frame a or the said irons may
be connected directly to the frame by dovetail ribs taking into dovetail grooves in
the latter as shown in Fig. 5. Fig. 6 is a separate view of one of the screws m
shewing its connection with the angle-iron runner and guide k connected to the
frame a.
When required to rub or polish the stone o at an angle the frame is
raised or lowered on one side by the said screws engaging with the bosses l' formed
on the angle iron runners l. For moulded work the sanding irons are formed to
the required shape and it is impossible for them to tilt as they are driven from a
central bearing and the frame is guided by the angle runners 1, the frame also
being suspended by its centre causes it to work perfectly level and true, and it
could even be operated by hand.
Instead of raising the frame by means of the weights on the end of suspension
rope it may be raised by a winch or drum fixed to the vertical supports g¹.
Having now 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.-
(1) The improved apparatus for sanding and polishing stone comprising a
rectangular frane supported at its four corners by hangers suspended from a central
rope or chain passing over guide pulleys and provided with adjustable weights, the
said frame being operated from its centre by a forked shaft or rod substantially as
described and for the purposes specified.

page_text: (2) In a stone sanding and polishing apparatus a centrally suspended and driven
rectangular or other shaped frame provided with sanding and polishing irons
connected thereto by grooved bars and bolts or dovetailed ribs and grooves
substantially as described and for the purposes specified.
(3) The combination of a centrally suspended and driven frame carrying sanding
and polishing irons and guides travelling on angle-iron runners adjustable by
vertical screws operated by bevel gearing substantially as described and for the
purposes specified.
(4) The improved stone sanding and polishing apparatus substantially as
described and shown in the accompanying drawings.
Dated this 16th day of December 1895.
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicants.