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Патент USA US2131862

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Oct. 4, 1938.
I
F. B, WALDRQN
2,131,862
'GLAS S GRINDING APPARATUS
Filed Jan. 28, 1958
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Patented Oct. 4, 1938
2,131,862
UNITED STATES PATENT OFFICE
2,131,862
GLASS GRINDING srraaa'rus
Frederic Barnes Waldron, Prescot, England, as
sig'nor to Pilkington Brothers Limited, Liver
pool, England, a limited liability company
Application January 28, 1938, Serial No. 187,398
In Great Britain February 1, 1937
6 Claims. (c1. 51-11'2)
This invention relates to grinding apparatus . carrying with it the sand which always remains
in suspension.
operating simultaneously on both sides of a con
tinuous strip of glass, and has for its object im
proved means for driving the strip through the
in apparatus.
Hitherto the strip has been driven by pairs of
rollers gripping the glass strip, one or both of
the rollers being driven. It has been found that
sand from the grinding tools accumulates in the
pass between each roller and the glass and causes
damage as the result of undue pressure between
the rollers and the glass and wear of the rollers.
It has further been found impossible to clean the
sand from the glass so effectively as to prevent
15
this accumulation.
,
7
According to the invention a roller, having. a
plurality of grooves at the pass between the roller
and the glass is combined with one or more water
jets so placed as to maintain a layer of water in
20 the pass between the roller and the glass, which
is in continuous rapid motion.
'
In the accompanying drawing:‘
'
Figure 1 is a side view of part of a grinding
apparatus; and
25
Figure 2 is a section thereof along the line A-A
of Figure 1; and
-
Figure 3 is a view of an alternative form 0
roller.
,
It is essential that the quantity of sand which
reaches the point indicated by ID in Figure 2
be so small that it does remain in suspension in
the water, and it is therefore preferable that the
squeegee 5 and water jets 6, or other sand remov
ing device be retained. But, if the quantity of
water used in the jets 9 be very large, this is
su?icient to wash away, oil? the edges of the strip, 10
nearly all the sand.
A single jet 9 may be employed if the velocity
of'the water be su?lcient to maintain the water
at the far end of the roller in rapid motion. Al
ternatively, a row of‘ jets may be employed at 15
different points along the roller.
Preferably, similar devices are employed on the
underside of the strip, the roller 4 also having
grooves. It is, however, possiblevto wash the un
derside of the glass clear of sand by water jets, 20
since the sand and water can escape from the
underside without having to flow to the edges of i
the strip.
'
A single spiral groove such as H in the roller
3 of Figure 3 is deemed to be the equivalent of a 25
plurality of circular grooves, since this presents
a plurality of grooves along the line of contact
between the roller and the glass, as does a roller '
The glass strip I is driven in the direction with a plurality of circular grooves.
Having described my invention, I declare that
30 of the arrow between the grinding tools 2, by pairs
of rollers 3, 4 gripping the strip. The apparatus , what I claim and desire-to secure by Letters Pat
ent is:
.
comprises generally about ?fteen pairs of grind
1.
Apparatus
for grinding a continuous strip of
ing tools, with a pair of driving. rollers between
each pair. It has been customary to remove the glass comprising grinding tools operating simul
35 sand, which is used as abrasive, from the glass by taneously on the upper and lower sides of the 35
means of a squeegee 5 and water jets 6, supplied strip, and the combination with pairs of rollers
between the tools adapted‘to grip the strip and
from the water pipe ‘I. The roller 3, which is gen
erally made of rubber, is provided with a plurality drive it between the tools‘ of which at least the
of grooves 8, and water jets are so placed, close upper roller has a plurality of grooves at the pass
40 to the glass and to the roller, that the layer of between the said roller and the glass, of means
water in the pass between the roller and the glass for maintaining a layer of water in continuous
and rapid motion in the said pass.
is kept in continuous motion.
2. Apparatus for grinding a continuous strip
‘Although the squeegee 5 and water jets 6 re
of glass comprising grinding tools operating si
r move nearly all the sand from the glass, it has
‘’ been found that a certain quantity of sand passes ‘
multaneously on the upper and lower sides of ’
‘the strip, and the combination with pairs of roll
the squeegee and, in the case of the usual cylin
ers between the tools adapted to grip the strip
drical roller accumulates in the pass between the and drive it between the tools of which at least
roller and the glass. By means of the water jets
O .9, the small quantity of sand which approaches
the pass of the roller is kept in‘ suspension in the
continuous and rapidly moving layer of water.
This layer of water ?ows along in the pass of
the roller until it reaches a groove 8, and is then
55 able to escape past the roller through the groove,
the upper roller has a plurality of circular grooves,
of means for maintaining a layer of water in
continuous and rapid motion in the pass between
the said roller and the glass.
,
.
3. Apparatus for grinding a continuous strip
of glass comprising grinding tools operating si
multaneously, on the upper and lower sides of 55
2
the strip, and the combination with pairs of roll— taneousiy on the upper and lower sides of the
ers between the tools adapted to grip the strip strip, means adapted to remove the abrasive from
and drive it between the tools of which at least t the surfaces of the strip and the combination with
the upper roller has at least one spiral groove, pairs of rollers between the tools ‘adapted to grip
of means for maintaining a layer of water in con
the strip and drive it between the tools of which
tinuous and rapid motion in the pass between at least the upper roller has a plurality of circu
the said roller and the glass.
lar grooves, of means for maintaining a layer 01'
4. Apparatus for grinding a continuous strip water in continuous and rapid motion in the pass
01’ glass comprising grinding tools operating si
between the said roller and the glass.
_
10 multaneously on the upper and lower sides of the
6. Apparatus ior grinding a continuous strip of 10
strip, means adapted to remove the abrasive from glass comprising grinding tools operating simul
‘the surfaces of the strip and the combination taneously on the upper and lower sides of the
with pairs oi rollers between the tools adapted strip, means adapted to remove the abrasive from
' to grip the strip and drive it between the tools the surfaces oi the strip and the combination with
of which at least the upper roller has a plurality pairs 01 rollers between the tools adapted to grip
of grooves at the pass between the said roller and the strip and drive it between the tools 01' which
the glass, of means for maintaining a layer of at least the upper roller has at least one spiral
water in continuous and rapid motion in the said groove, of means for maintaining a layer of water
Pass.
in continuous and rapid motion in the pass be
20
5. Apparatus for grinding a continuous strip of tween the said roller and the glass.
20
glass comprising grinding tools operating simul
FREDERIC BARNES WALDRON.
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