тог стезяць tie Purposes.
Year: 1895

page_text: France),
Date of Application (in United Kingdom), 30th Mar., 1895
Complete Specification Left, 28th Dec., 1895-Accepted, 7th Mar., 1896
PROVISIONAL SPECIFICATION.
паспие тог стезяць tie
Purposes.
We, THE SOCIÉTÉ PARISIENNE DE VERRERIE OPTIQUE of 20 Rue Félicien
David, Paris in the Republic of France, do hereby declare the nature of this
invention to be as follows:-
The object of this invention is to produce a simple and effective machine for
to make the
grinding the peripheries of glass discs for optical purposes, so as
discs absolutely round, and all of the same size.
In carrying out this invention, the glasses, when they come from the glass works,
are square. The corners are then nipped off, and the glasses are next dressed in
the machine to be presently described, to remove all angularities, and make them
round.
The machine consists of a cylindrical vessel, in which a suitable horizonta!
guiding wheel is caused to rotate, the said wheel being mounted on a vertical
spindle projecting through the vessel, and turning in a step bearing, which is
capable of vertical adjustment to raise or lower the grinding wheel as desired.
The glasses or lenses to be ground are fitted together and secured with pitch,
so as to form a cylinder of glass, which is clamped between two horizontal shafts,
the axes of which will correspond to the axis of the cylinder.
At one end, one shaft is provided with a disc set diagonally, which, as the
shaft is rotated, will cause it to assume a to and fro motion as well.
The shafts pass through plate bearings which are free to rise and fall in vertical
standards fitted to the table of the machine, and the standards are provided
to arrest the fall of the
with adjustable cross bars, which can be set so as
bearings when the cylinder of discs has been ground down to the proper size by
contact with the grinding wheel on which wet grit is continually thrown.
One of the shafts is driven by the friction of a disc carried thereby upon a drum
carried by a swinging frame, and driven in any convenient manner from a prime
mover. The outer end of the other shaft is fitted into an elastic support, which,
while allowing the shafts to reciprocate, will cause the shafts to firmly grip or
clamp the glass cylinder between them.
When the cylinder is ground down to the required size, it is removed from the
machine, and the discs are separated.
Dated this 30th day of March 1895.
NEWTONT
SON
NEWTON & SON,
Agents for the Applicants.

page_text: Machine for Dressing the Peripheries of Glass Discs for Optical
Purposes.
We, THE SOCIÉTÉ PARISIENNE DE VERRERIE OPTIQUE, of 20 Rue Felicien
David, Paris in the Republic of France, do hereby declare the nature of this
invention and in what manuer the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The object of this invention is to produce a simple and effective machine for
grinding the peripheries of glass discs for optical purposes, so as to make the discs
absolutely round, and all of the same size.
The glasses, when they come from the glass works, are square, and in carrying
out this invention, the corners are first nipped off, and the glasses are then dressed
in the machine to be presently described, to remove all angularities, and make
them round.
The roughly prepared discs of glass are stuck together by means of pitch or
other suitable adhesive material, so as to form a cylinder of glass, and it is in this
form that the discs are worked up by the machine, which is shown, by way of
example, in the accompanying drawing, in which-
Fig. 1 is an elevation, partly in section;
Fig. 2 is a plan view, and
Fig. 3 is anlend view, of the machine which is the object of the present invention.
The machine consists essentially of a disc A fixed upon the extremity of a
vertical shaft B, which carries the driving pulleys C. The shaft B rests at its
lower end in a step bearing D, containing a ball d. The position of the step
bearing D may be regulated at pleasure by means of a screw and nuts in such
manner as to permit of the horizontal disc A being more or less raised and
lowered. This disc is free to rotate in a circular tray or receiver E, which will
contain a quantity of emery and water, which is employed in the operation of
grinding down the peripheries of the glass cylinder F. The ends of the cylinder F
(formed by the juxtaposition of the discs of glass) are attached in any convenient
manner to two small solid metal discs G G¹, having sockets gg. In the socket
is secured, by a bayonet joint, the end of the shaft H, and in the socket g¹ is
secured, likewise by means of a bayonet joint, the extremity of the shaft H¹. The
shafts H H', which are exactly in line, traverse the wall e of the tray or receiver E,
and are supported in standards II', which will be described in detail. Each of
these standards I I¹ consists essentially of two vertical pieces J J, having on the
inner edge a groove i, in which is free to slide a plate K, pierced with a hole
through which passes the respective shaft H or H. Two strips 11, fixed to the
supports J J, maintain the plate K in its vertical position. Under the plate K is
placed a transverse piece L, which is free likewise to move lengthwise of the
supports JJ. To this end, this transverse piece is furnished with a dovetail
recess, which engages with corresponding projections M, M on the supports J, J.
The piece L is further provided with two holes, screw-threaded, through which
pass the rods N N, likewise threaded, and furnished at their upper ends with
thumb screws, to permit of rotating the same. On turning the thumb screws, the
screws N N will rotate, and consequently the bar L may be made to ascend or
descend the supports or standards J J.
It will be seen from this arrangement, that if the cylinder of glass F is put in
position on the disc A, the plates K through which the shafts H H
will be a
pass
certain height above the work-table, and cannot descend, because the cylinder F
of glass rests upon the disc A. But in proportion to the grinding down of the
glass by its friction upon the disc A (friction obtained by the means which will be
hereinafter described), the plates K will descend at the same time, because the

page_text: grinding down is equal at all points of the cylinder. The plates K will come down
until the shafts H, H' touch the immovable pieces L. the height of which has been
previously regulated. Thus, by means of this adjustment, the cylinder F can have
any desired diameter given to it.
Between the standards I & II, the shaft H carries a frictional wheel O, which
serves to give motion to the shaft H H. This wheel O rubs against another and
larger wheel or drum O', mounted upon an auxiliary shaft, which is driven by a
pulley Ou
The axle of the drum O' may be moved away from the wheel O. To this end,
the forked frame P, which carries the axle, is jointed, by means of a hinge Q, to
the stump Q, fixed upon the table R. To set the shafts H, H' in motion, the
drum O is placed in contact with the wheel O, and, to stop the shafts H H¹, the.
drum O is thrown out of contact. At the extremity of the shaft H is mounted a
plate T, oblique as regards the shaft H. This plate turns between two rollers S S¹,
fixed upon the table R. By means of this arrangement, the shaft HH¹, and
consequently the cylinder of glass F, will receive a to and fro movement in the
line of its axis, in addition to the rotary motion given by the drum O'.
To obtain perfect regularity in the to and fro movement, the end of the shaft H¹
is subject to the action of a hinged finger V, which is constantly pressed against it
by a spring W. In this way, the plate T remains constantly in contact with the
roller S.
The action of the machine is as follows:-
The cylinder of glass F, having been put into place, the machine is set in motion,.
and the cylinder F rubs on the disc A, which is also rotated to bring successively
all parts of the disc in contact with the cylinder, and to obtain the equal grinding
of all parts of the disc. At the same time that it turns upon itself, the cylinder F,.
as has been explained, receives a to and fro movement, and these three combined
movements produce a regular grinding down of the glass, which thus takes an
exact cylindrical form.
It will be understood that it is necessary to constantly put some wet emery or
When
other grinding powder or material between the cylinder F and the disc A.
the cylinder has been ground to the desired diameter the shafts H H' are separated,.
and the disc of glass detached from each other.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
The machine for working optical glasses, as above described, which allows of
discs of glass being obtained exactly circular, no matter what may be the diameter
of the discs and their thickness, as set forth.
Dated this 19th day of December 1895.
NEWTON & SUN,
Agents for the Applicants..