Improvements in Machinery to be Employed in connection with the Bevelling and also the Finishing of the Bevelled Edges of Glass Plates.
Year: 1897

page_text: Date of Application, 27th Apr., 1597-Accepted, 12th June, 1897
±
COMPLETE SPECIFICATION.
Improvements in Machinery to be Employed in connection with
the Bevelling and also the Finishing of the Bevelled Edges of
Glass Plates.
I, ALFRED GRIFFITHS of 374 Green Lanes, Small Heath, in the City of
Birmingham, Foreman of Works, 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 machinery to be employed in connection with the
production, by grinding, of the bevelled edges of glass plates, and the like and also
the subsequent smoothing and polishing or finishing of the same, the said invention
being a development or further application of the machinery described in the
Specification of former Letters Patent granted to me and bearing date the
13th day of March 1896 and numbered 5677.
My present invention has for its object, the simplification of the means for
performing the aforesaid operation.
Figure 1 of the accompanying drawings represents a side elevation of a glass plate
bevelling machine constructed, arranged and provided with improvements made
according to my present invention. The said machine, as shown, is arranged to
give a radial movement over a stone to a glass plate, the edges of which have been
already rough-bevelled by traversing the plate by another attachment in a right
line to and fro across the face of a rotating mill or iron disc-ring, fed with grit or
sand as usual for giving the initial rough bevel.
Figure 2 is a back elevation of the said machine, with a part of the stand!
represented in dotted lines.
Figure 3 is a back elevation of the adjustable stand, showing the means of tilting
the same in order to adjust the angle at which the glass plate is presented to the
mill or stone.
Figure 4 is a side elevation of the said stand.
Figure 5 is a side elevation of the glass-clamping attachment, which is substituted
for the radially moving attachment shown applied to the machine in Figure 1, in
order to give the rectilinear traverse of the plate to and fro across the width of the
mill in giving the initial rough hevel to the said plate.
Figure 6 is a plan of Figure 5.
Figure 7 is a side elevation of the attachment employed in bevelling circular
plates and
Figure 8 is a topside plan of the same.
Figure 9 is a plan of the top arm or member of the radial-moving glass clamping
attachment. And
Figure 10 is a like view of the bottom arm of the same.
The same letters of reference indicate corresponding parts in the several figures
of the drawings.
a is the general framing of the machine, turning or being hung so as to turn upon
a shaft b, carried by a fixed but adjustable stand c, secured at its base c', to a
suitable bed. The said framing has a vertical sleeve a', through which passes a
vertical shaft d, having at its lower end d¹, a hanging crank plate e, horizontally
FDQ71

page_text: disposed, and having a stud e', upon its underside, taking within a longitudinal slot f¹,
of a radially working glass-holder attachment f, comprising a top bar f², pivotally
connected or centred at its inner end f³, to brackets a³, carried by the frame a,
which, together with its gear, is mounted and rocks upon the shaft b. At the
other and forward end of this arm, is the glass clamp f, consisting of a disc f*,
turning upon a centre f, and having a series of holes f, sunken within it,
corresponding to the number of the sides of the plate to be bevelled, and being
locked fast by a vertically sliding pin f', raised and lowered by a lever f³,
fulcrumed at and normally made to engage one or other of the holes by a
spring 10.
9
The underside of the top clamping disc is preferably faced with rubber, as also
is the opposed face of the lower clamping disc f", which is swivelly mounted at f1,
upon the outer end of a double armed lever f, fulcrumed at 14, and with the
arm 1, pressed home and adjusted to varying thicknesses of glass by a screw ƒ 16,
passing through the top member f³.
Made fast to the upper end of the shaft d, is a toothed wheel d³, and also a
pinion d³, which intergears with a large toothed wheel d, of a drum d³, mounted on
the spindle d' and having located within it, a driving spring do, whose one end is
connected to the inside of the drum and the other end to the spindle d', which
also has upon it a ratchet wheel d, with which a spring pawl d³,
spring is preferably wound up by a hand wheel on the summit of the spindle.
engages.
The
The running down of the spring is governed by a train of wheels, in which the
wheel, intergears with a pinion g on the axis of a toothed wheel g', which
intergears with a pinion 92, on the axis of the toothed wheel 9, meshing in turn
with the teeth of a further pinion g', fast with a toothed wheel g³, driving a
pinion 9, on the spindle 9', of the fly 98.
h is a double-armed bracket made fast to but adjustable upon the shaft b, the
arm ', of which forms a stop against which the adjustable pin 4, passing through
the screw box ³, of an outstanding arm A, fast upon the framing a, takes a bearing.
and by the adjustment of which the amount of swing of the frame and the parts
carried by it and the degree or extent of the bevel, is regulated, as it is understood
that the weight of the overhanging part of the machine brings the edge of the
glass plate being bevelled up to the frame and automatically follows up the cuts
as the grinding proceeds until the end of the screw coming against the stop prevents
the framing swinging or turning further upon the shaft and the grinding from
proceeding further than the predetermined extent.
The lower end c³, of the stand c, (see Figures 3 and 4) works within a dove-
tail slide rest bed 2, having hanger lugs c, at its ends coming against like upstanding
lugs c, upon the ends of the bed c', and through coincident holes in which lugs,
the spindle c, about which the upper part of the stand is capable of rocking or
tilting as a centre, passes, the extent of such tilt being regulated and determined
by a pair of opposite set screws c', respectively passing through screwed holes in
the rest c², and with their lower ends taking a bearing against the bed c'.
The stand c, is longitudinally traversed along the rest bed c³, by a screw c³, fitted
with a hand wheel or the like and journalled at its ends in the said bed and taking
through a screw box ; depending from the bottom of the stand and passing
through a longitudinal slot in the bed, whilst the position of the machine relative
to the rest is adjusted vertically by another screw clo, likewise fitted with a hand
wheel or turn at its top end and carried in bearings in the stand c, whilst its
middle part takes through a screw box carried by the bracket c", sliding upon the
stand and carrying the shaft b.
.
In the attachment shown in Figures 5 and 6 for giving a rectilinear move-
ment or to and fro traverse to the plate across the width of the mill in rough
grinding the bevels, and which is substituted for the radially-moving attachment
shown in Figures 1 and 2; i is a frame, made up of a top and slotted member i,
pivotted at 2, to the lower miember 3, and about which pivot the sail upper

page_text: member rocks. The said upper member carries upon its top side, a bed, within.,
which a slide-rest saddle i, traverses, and through a bearing in which the shaft d,
having the crank plate e, and stud e', at its lower end, engaging in the slot 220,.
passes. By rotating the vertical shaft d, the necessary backward and forward
traverse is given to the attachment i, which hangs from the ends of the saddle, and
carries the plate to be bevelled which is clamped between plates, (not shown) alike.
unto those represented in Figure 1. is the lever for operating the plate locking
stud, and is the screw which adjusts the distance between the plates and clamps
the glass between them.
To substitute this attachment for the one shown in Figure 1, it is ouly necessary
to withdraw the pin from the sleeve ƒ³, and remove the hearing or sleeve a', when
the frame f, can be removed in its entirety. The stud el, is now introduced into.
the slot 10, and the bearing, carrying the bed 4, and slide rest saddle ³, is bolted.
to the framing and partly surrounds the axle d.
In the attachment shown in Figures 7 and 8 employed in bevelling round plates,.
the end of the axis d, carries one of the clamps k whilst the other clamp k', is
carried on a swivel joint k*, at the end of the longer arm of the lever k³, which is
pivoted at , to the fixed part ko, bolted or otherwise secured to a suitable part of
the framing by the attachment plate . The said clamps are closed together and
made to firmly grip the plate held between them by the spring k³, located between,
the after ends A, A, of the lever k³, and fixed part of the frame k³, respectively.
The application of my invention to the polishing and finishing of the bevels differs in.
no essential respect from its application to the production of the bevels by grinding.
as herein described. Instead of employing a mill or rotating plate, I may employ a
rotating drum for either the initial roughing or the finishing process.
Having now particularly described and ascertained the nature of my said inven--
tion, and in what manuer the same is to be performed, I declare that what I
claim is :-
First. In machinery for use in connection with the bevelling of glass plates, and
with the polishing or finishing of such bevels, the employment in combination with
driving mechanism, or spring driving mechanism, of a radially working plate--
carrier.
Secondly. In machinery for bevelling glass plates, or for polishing or finishing
the bevels of glass plates, the combination with the driving mechanism, or spring-
driving mechanism, of a radially-working plate-carrier, driven by a stud on a crank
disc or equivalent, engaging in a slot or equivalent in the said carrier, substantially
as described and set forth.
Thirdly. In machinery for bevelling glass plates, or for polishing or finishing
the bevels of glass plates, the combination with driving mechanism, or spring
driving mechanism, of rectilinear traversing plate carrier.
Fourthly. In machinery for bevelling glass plates, or for polishing or finishing
the bevels of glass plates, the combination with driving mechanism, or spring-.
driving mechanism, of a rectilinear-traversing plate carrier, driven by a stud on a
crank disc or equivalent engaging in a slot or equivalent in the said carrier,.
substantially as described and set forth.
Fifthly. In machinery for bevelling glass plates, or for polishing or finishing the
bevels of glass plates, the combination with driving mechanism, or spring-driving
mechanism, and a rectilinear traversing plate-carrier or a radially working plate-
carrier, of a stop and adjusting screw for limiting and regulating the forward swing.
of the machine, substantially as described and set forth.
Sixthly. In stands for glass bevelling and bevel polishing, the means of
longitudinally adjusting and tipping or tilting the same, substantially as described
and set forth.
Seventhly. The improvements in and in the general construction, arrangement
and combination of the parts of glass bevelling, and bevel polishing machines, and

page_text: in stands, and glass holders or clamping attachments therefor, substantially as
described and set forth.
Dated this 96th day of April 1897
ALFRED GRIFFITHS,
By Henry Skerrett,
24 Temple Row, Birmingham, Agent for Applicant.
ALFRED GRIFFITHS,
By Henry Skerrett,
24 Temple Row, Birmingham, Agent for Applicant.