Improvements in Machinery for Grinding Metallic Surfaces by Means of Emery Wheels.
Year: 1886

page_text: PROVISIONAL SPECIFICATION.
Improvements in Machinery for Grinding Metallic Surfaces by
Means of Emery Wheels.
I, DAVID JOHNSTON, of 6 Osborne Place, Govan, in the County of Lanark, North
Britain, Engineer, do hereby declare the nature of this Invention to be as follows,
that is to say :-
My said Invention has for its object to improve the construction and operation of
machinery for grinding metallic surfaces by means of emery wheels. My improved
machinery is advantageously applicable for grinding the surfaces of screw-propeller
blades for the purpose of coating them with tin or other protective metal or alloy, as
described in my Patent Specification No. 2011 of 1882; and it is also applicable for
grinding other metallic surfaces being especially adapted for applying the grinding
action of the emery wheel in various directions, and upon surfaces having various
positions or inclinations on the same article.
In my improved machinery the emery wheel is upon one end of a shaft the normal
position of which is horizontal, and which is fitted to rotate in bearings in two tubes
fitted to each other telescopically. One tube which is the outer one has its inner end
held in a bearing or socket which is attached to a fixed pillar or standard by means of
a compound or universal joint, allowing the tube with the shaft in it to be placed in
various angular positions. The inner tube has the bearing or bush for the shaft at its
outer end, and the emery wheel is fixed on the projecting end of the shaft as closely as
conveniently may be to the end of the tube. The two tubes are fitted together with
screw threads and the inner tube is moved out or in by turning the outer tube either
by means of a handwheel on it or by means of a rope acting on a pulley on it, or by
means of feeding gear worked from the shaft. The attendant workman guides the
emery wheel by means of a lever fixed to the inner tube and extending across to the
further side of the article which is being operated on; and when a rope is used for

page_text: turning the outer tube to move the emery wheel outwards or inwards, such rope is led over
guide pulleys to a position convenient to the workman, a weighted pulley being applied
to it to keep it tight. The overhanging weight of the emery wheel with its shaft and
the tubes is sustained by a rope or chain passing over a pulley to a counter weight, the
pulley being movable along a shaft to accommodate itself to the various positions of
the emnery wheel. The shaft of the emery wheel is driven by means of a small pulley
placed on it as near as possible to the centre of angular movement of the tubes or
shaft, the pulley being fitted with a feather and groove to allow the shaft to move out
or in as required. The pulley is acted on by a belt from a large overhead pulley or
drum, and the belt is kept tight by a pulley held by a sliding bar which is acted on by
a weighted cord.
EDMUND HUNT,
Applicant's Agent.

page_text: COMPLETE SPECIFICATION.
Improvements in Machinery for Grinding Metallic Surfaces by
Means of Emery Wheels.
I, DAVID JOHNSTON, of 6 Osborne Place, Govan, in the County of Lanark, North
Britain, 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, that is to say
My said invention has for its object to improve the construction and operation of
machinery for grinding metallic surfaces by means of emery wheels. My improved
machinery is advantageously applicable for grinding the surfaces of screw-propeller
blades for the purpose of coating them with tin or other protective metal or alloy as
described in my Patent Specification No. 2011 of 1882; and it is also applicable for
grinding other metallic surfaces, being especially adapted for applying the grinding
action of the emery wheel in various directions, and upon surfaces having various
positions or inclinations on the same article.
And in order that my said Invention and the manner of performing the same may
be properly understood I hereunto append a sheet of explanatory drawings to be here-
inafter referred to and showing my improved machinery.
Figure, 1, on the accompanying sheet of drawings is a side elevation and figure, 2,
an end elevation. In these drawings the same reference numerals are used to mark the
same or like parts wherever they are repeated.
In my improved machinery the emery wheel, 3, is upon one end of a shaft, 4, the
normal position of which is horizontal, and which is fitted to rotate in bearings in two
tubes, 5, 6, fitted to each other telescopically. One tube which is the outer one, 5, has
its inner end held in a bearing or socket, 7, which is attached to a fixed pillar or
standard, 8, by means of a compound or universal joint, 9, allowing the tube, 5, with
the shaft, 4, in it to be placed in various angular positions. The inner tube, 6, has the
bearing or bush, 10, for the shaft, 4, at its outer end and the emery wheel, 3, is fixed
on the projecting end of the shaft, 4, as closely as conveniently may be to the end
of the tube, 6. The two tubes, 5, 6, are fitted together with screw threads and the
inner tube, 6, is moved out or in by turning the outer tube, 5, either by means of a
handwheel, 11, on it or by means of an endless rope, 12, acting on a pulley, 13, on it.
The attendant workman guides the emery wheel, 3, by means of a lever, 14, fixed to
the inner tube, 6, and extending across to the further side of the article which is being
operated on; and which in this case is a screw-propeller blade, 15, placed on a
carriage, 16. When the endless rope, 12, is used for turning the outer tube, 5, to
move the emery wheel, 3, outwards or inwards, such rope, 12, is led over guide
pulleys, 17, 18, to a position convenient for the workman, its outer lower part passing
through eyes, 19, on the outer ends of a cross bar, 20, fixed to the outer end of the
lever, 14, a weighted pulley, 21, being applied to the rope, 12, to keep it tight. The over-
hanging weight of the emery wheel, 3, with its shaft, 4, and the tubes, 5, 6, is sustained
by a chain, 22, (or it might be a rope) passing over a pulley, 23, to a counterweight

page_text: (not shown) the pulley, 23, being movable along a shaft, 24, to accommodate itself to
the various positions of the emery wheel. The shaft, 4, of the emery wheel is driven
by means of a small pulley, 25, placed on it as near as possible to the centre of angular
movement of the tubes or shaft, the pulley, 25, being fitted with a feather and groove
to allow the shaft, 4, to move out or in as required. The pulley, 25, is acted on by a
belt, 26, from a large overhead pulley or drum, 27, and the belt, 26, is kept tight by a
pulley, 28, held on one end of a sliding bar, 29, which is acted on by a weighted
cord, 30, attached to its other end the cord passing over a pulley, 31, fixed to one end
of a stationary bar, 32, which is fixed to the pillar, 8. The belt, 26, is held in position
on the pulley, 25, by two guide prongs, 33, fixed to the bearing, 7.
If preferred the outer tube, 5, may be turned by means of feeding gear worked from
the shaft, 4.
Having now particularly described and ascertained the nature of my said Invention
and in what manner the same is to be performed I declare that what I claim is :-
1. The combining and arranging of the parts constituting my improved machinery
for grinding metallic surfaces by means of emery wheels substantially in the improved
manner hereinbefore described and shown in the accompanying drawings.
2. The fixing of the emery wheel on a shaft capable of moving on end in a carrier
which is capable of moving angularly, combined with the driving of the shaft by
means of a pulley through which the shaft is movable and which is held close to the
centre of angular movement of the carrier substantially as hereinbefore described.