Improvements in Apparatus for Grinding, Smoothing, and Polishing Glass, Stone, Marble, and the like.
Year: 1890

page_text: Date of Application. 29th Nov., 1890-Accepted, 3rd Jan.,
1891
Improvements in Apparatus for Grinding, Smoothing, and Polishing
Glass, Stone, Marble, and the like.
I, CHARLES DELRUE, of Molenbeck, St. Jean lez Bruxelles, in the Kingdom of
Belgium. 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 apparatus for grinding smoothing and polishing glass, stone,
marble and the like.
The best apparatus heretofore used for smoothing and polishing glass and the like
are composed of a platform of from 6 to 7 metres in diameter, covered with a
horizontal metallic flooring upon which the glass is cemented by means of plaster ;
and a rolling-bridge adapted to move upon rails, to which are fixed two mullers or
carts mounted upon shafts and held by the bridge. A turning movement is imparted
to the platform, and the mullers resting with their weight upon the table are also
caused to make a turning movement at a more or less considerable velocity relatively
to that of the platform. When the second grinding operation has been finished the
smoothing and polishing are commenced, so that the moment has arrived for using my
apparatus. The bridge which has been used in the second grinding is pushed
forwards and in its place is put the bridge to which the devices hereinafter described
are fixed.
1 employ the same bridge for three plates provided with a great number of
discs (72) in smoothing and polishing the ground glass, which operation takes about
These
two hours, whilst with the best apparatus hitherto used it takes four hours.
last-mentioned apparatus can carry only two plates, and they have only about half
the number of discs covered with felt (40 or 42 instead of 72) provided in my apparatus
on a platform of 6.25 metres in diameter.
Moreover considering the advantageous arrangement of the polishing discs in my
apparatus there can be no doubt that the operation will take place double as quickly as
with the apparatus heretofore employed.
The accompanying drawings represent my improved apparatus for smoothing and
polishing glass and the like as constructed for production on a large scale.
Figure 1 is an elevation and Figure II a plan of this apparatus. Figure III shows
a section of the beams forming the frame; whilst Figure IV represents a section of
the polishing disc with its support.
A denotes the platform having a diameter of 6.25 metres; B a vertical shaft upon
which the platform is secured; Ca cross-piece serving as a bracket for the vertical
shaft; Da bearing upon which rests the vertical shaft carrying the platform; Ea
toothed wheel for transmitting the motion; F a pinion for transmitting the motion
to the toothed wheel; G a horizontal shaft receiving the movement of the trans-
mitting gear; H loose and fixed pullies receiving the movement for the second
grinding; I loose and fixed pullies receiving the movement for the polishing; J a
rolling bridge upon which are fixed devices for the second grinding and the polishing;
K a large plate carrying a great number of the polishing discs; L small plates also
carrying polishing discs. Ma shaft for the large plate; N shafts for the small
plates; O the supports guiding the shafts for the small plates; P levers for lifting
the polishing discs; Q hand wheels for adjusting the plates; R the general arrange-
ment of a polishing disc drawn to th of its full size, and S a support or bracket.

page_text: .
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:-
First. In apparatus for smoothing and polishing glass, stone, marble and the like
the employment of three plates enabling the number of polishing discs and the devices
which serve for governing them to be considerably augmented, and the improved
arrangement herein before described, for the purpose of increasing the effectiveness of
such apparatus.
Second. The employment of the above-described apparatus having three mullers or
carts for the said grinding operation, for the purpose of enabling the surface to be
ground in a shorter time.
Dated this 50th love of Naramban 1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.