A Machine for Bevelling Glass.
Year: 1899

page_text: Date of Application, 3rd Aug., 1899-Accepted, 14th Oct., 1899
A Machine for Bevelling Glass.
I, MAXIME JOHANNET, of 113, Boulevard Ménilmontant, Paris, in the Republic
of France, Engineer, do hereby declare the nature of this invention, and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:
The object of this invention is to provide a machine for bevelling glass, enabling
the bevel to be cut and ground at one stroke.
The invention also provides means whereby the glass to be bevelled is firmly
retained in position on a support so that it will withstand a pressure which
would otherwise be liable to break it, while permitting the line, corresponding
to the bevel-edge to be cut, to be brought to such a position, before the cutting
is commenced, that it shall be parallel both to the edge of the glass and to the
plane of operation of the grinding wheel or grind-stone.
The invention will be best understood by reference to the accompanying draw-
ings, in which Figure 1 is a vertical section on the line A, B, Figure 2; Figure 2
is a plan of the work-bench of the machine; and Figure 3 is an elevation, and
Figure 4 a plan of the general arrangement of the machine.
The glass 1 to be bevelled is supported at its lower edge, on the inclined
support 2 of the glass-supporting carriage, by means of a projecting strip 3 of
stout leather, or other suitable material, a strip of iron or other metal, 4,
serving to strengthen, or stiffen, the strip 3. The said strips are secured to the
bottom of the support 2 by means of screws 5. At its upper part the glass is
maintained in contact with the support 2 by means of a spring-controlled trans-
verse tightening piece (not shewn in the drawings) to prevent any longitudinal
movement on the strip 3 during the grinding process.
The glass is adjusted in the proper position on the inclined support 2, as
hereinabove described, before being cut, by means of the following arrange-
ments which enable it to be placed within ths of a millimetre of its theoretically
correct position.
This arrangement comprises a slide 6 mounted on pivots or hinges 6 which
are exactly parallel to the plane of operation of the grinding wheel, or grind.
stone, upon this slide 6 there are arranged two carriages 7 and 8 each carrying
an indicating instrument 9 and 10.
Each of the carriages 7 and 8 consists of a bracket 11 which can be slidden ⚫
along the slide 6 from end to end in either direction. These brackets are each
guided and maintained upon the slide 6, by engaging with its top, and by a
rib 12 of a dove-tail section secured to, or integral with, the slide 6, to which the
carriage is attached by correspondingly dovetailed parts and to which it can
be fixed by tightening a thumb-nut 13 on a screw upon a wedge 14 represented in
dotted lines in Figure 1. In the bracket 11 there is cut a dove-tailed slide-
way 15 wherein a plate, or platform, 16, is adapted to slide transversely, motion
being imparted to it by means of a spindle provided with a micrometer screw 17
and operated by means of a graduated head 18 which is turned as required in
front of a stationary index. The indicating instruments 9 and 10 are each

page_text: point of the second indicating instrument 10 should be moved into contact with
the same point of the glass and similarly adjusted.
To adjust the glass 1 in position it is only necessary to turn by the two hand
wheels 42 and 43 the screw-threaded spindles which control the glass-supporting
carriage at each end of the work bench, until the glass 1 by pressing on the
points 27, brings the needles of each indicating instrument simultaneously to
the same division of their respective dials.. The line, or edge, of the bevel to
be cut will now be parallel to the line connecting the points 27, and consequently
parallel also to the edge of the slide and to the plane of operation of the grind
stone. After this adjustment all that remains to be done is to turn down the
slide 6 on its hinge 6 so as to remove the points 27 during the movement of
the glass. The springs 22 are intended to prevent any deterioration of the
indicating instruments should it so happen that while the glass is being put
into position the glass-supporting carriage is, through the carelessness of the
operative, made to advance in the transverse direction too abruptly so as to
Should this occur, the
push the slides 24 beyond the limit of their stroke.
cases 19 will, owing to the provision of the said springs 22, simply turn on their
pivots without anything being distorted or broken.
Figures 3 and 4 are diagrams showing general arrangement of the machine,
in elevation and plan respectively.
36 is an electric motor upon the shaft of which is mounted the grindstone 37,
an arrangement which obviates the danger of the glass plates being broken
through the employment of driving straps.
Motion is communicated to the main carriage 38, (which carries the support 2)
by means of two shafts 39 and 40, the former of which is actuated by means
The shafts 39
of an endless screw arranged upon the main shaft of the motor.
and 40 are connected by gear wheels adapted to set in motion the said main
carriage and support during the grinding process, and also by straps which
ensure the rapid return of the carriage 38. The screws 41 enable the glass 1
to be inclined at a greater, or lesser, angle according to the angle of the bevel
which it is desired to obtain.
The details may be varied without departing from the nature of the invention.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I
claim is:
1. A machine capable of bevelling glass at one stroke, the said machine being
constructed and operating substantially as hereinabove described and illustrated
in the accompanying drawings.
2. In combination with machines for bevelling glass, the arrangement for
fixing and adjusting upon a support, plates of glass varying in thickness, or the
two surfaces of which are not parallel, such arrangement consisting of screw-
threaded spindles 42 and 43 provided at each end of the machine and two in-
dicating instruments all arranged and operated substantially as hereinabove
described and illustrated in the accompanying drawings.
3. For use in machines for bevelling glass indicating instruments constructed
substantially as hereinabove described and illustrated in Figures 1 and 2 of the
accompanying drawings.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.