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Патент USA US2134798

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Nov. 1, 1938.
2,134,798
w. OWEN
PLATE GLASS SURFACING TABLE
Filed March 29, 1958
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INVENTOR.
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ATTORNEYS.
Nov. 1, 1938.
w. owEN
2,134,798
PLATE GLASS SURFACING TABLE
Filed March 29, 1933
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INVENTOR
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2,134,798
Patented Nov. 1, 1938
UNITED STATES
,
PATENT OFFICE
2,134,798
PLATE cuss suaracmc TABLE
William Owen, Pittsburgh, Pa., asslgnor to'Pitts
burgh Plate Glass Company, Allegheny County,
Pa., a corporation of Pennsylvania
Application March 29, 1938; Serial No. 193,673
3 Claims. (Cl. 51-240)
ribs 9 and I0, which‘location permits the slots to
The invention relates to tables for use in sur
facing plate glass, in which the tables are passed be relatively deep without any appreciable weak
ening of the table top. This expedient of slotting
in a continuous train beneath a series of grinding
and polishing, runners. The heat developed in
5 the polishing operation causes the tops of the
tables to warp or bow slightly, so that they are
no longer true and flat, and when returned to
the grinding end of the cycle for reuse, this bowed
or warped condition persists to a certain extent,
10 so that the glass sheets are not ground to uni
form thickness, the sheets being ground thinner
in the portions overlying the centers of the tables
than those overlying the sides of the tables. The
object of the present invention is to provide an
1 OI improved table construction in which the warp
ing of the table tops due to the heat developed
in polishing is substantially eliminated. A fur
ther object is the provision of a surfacing table
having the characteristics speci?ed which is no
20 more costly than the standard surfacing table
and which has the same rigidity and durability.
One embodiment of the apparatus is shown in
the accompanying drawings, wherein:
the top of the table, substantially reduces any
tendency to warping which would otherwise occur 5
when the top is heated up due to the polishing
action. When the top is sub-divided in this man
ner, each section I4 is independent of adjacent
sections, so that while each section may warp
slightly, the effect is not cumulative and the top 10
as a whole remains substantially ?at and true,
even though raised to a relatively high temper
ature during the polishing operation. The upper
portion of the grooves is preferably ?lled with
plastic, material l5, such as rubber for preven- “5
ing the plaster used in cementing the glass to
the table top from ?lling the grooves. As indi
cated above, the placing of the slots in alinement
with the ribs permits these slots to be made rela
tively deep without adversely affecting the 20
strength and rigidity of the table and constitutes
a very deep, simple expedient for overcoming the
difficulty as to warping heretofore referred to.
I am aware that it is not broadly new to saw a
Figure 1 is a plan view. Fig. 2 is a side ele- . table top, so as to divide it into rectangular sec- 25
25 vation. Fig. 3 is a transverse section on the line
tions, as shown for example in the patent to
IIL-III of Fig. 1. And Fig. 4 is an enlarged par
tial section also on the line III-III of Fig. 1.
Referring to the drawings, 5 is the body por
tion of the table preferably of cast steel or cast
30 iron carried upon the wheels 6, which ride upon
the track 1.
The upper portion of the car com
prises the top 8 in the form of a plate of sub
stantial thickness and the ribs 9 and i0 integral
with the top. The ribs 9 extend transversely of
35 the top while the ribs 10 extend longitudinally
thereof, thus dividing the lower side of the top
into rectangular sections, the ribs intersecting
where they pass each other. This provides a very
rigid construction, well adapted to stand the
40 stresses incident to grinding and polishing.
Along the edges of the plate 8 the usual pins II
are provided extending through suitable perfo
rations and serving as means for positively an
choring the glass sheet which is carried on the
45 top of the table from lateral movement.
The upper surface of the top 8 is ?at and
smooth, and is provided with two sets of slots l2
and iii, the slots 12 extending the length of the
table, while the slots l3 extend transversely there
50 of, thus dividing the top into a plurality of rec
tangular sections, as indicated in Fig. 1. These
slots are formed by a sawing action, and as indi
cated in Fig. 3, extend down to a point below
the level of the underside of the plate 8. They
55 are preferably located on the center lines of the
Jacob Soderberg No. 1,983,009, dated December
4, 1934, but in such cases, the top is materially
weakened intermediate the reinforcing ribs used
on the underside of the top, and the car con- 30
struction is made more complicated and expen
sive, as compared with the construction herein
disclosed, wherein the slots are in line with the
reinforcing ribs, so that there is no decrease in
the rigidity of the table top, and it is possible 35
to use one integral casting of about the same
cost as a standard table.
What I claim is:
1. A plate glass surfacing table comprising a
metal top plate having a ?at upper face and a 40
plurality of intersecting spaced longitudinal and
transverse ribs projecting from the lower side of
the plate and integral therewith, the upper side
of the plate being provided with a plurality of
intersecting longitudinal and transverse slots in 45
line with said ribs dividing the upper face of the
table into rectangular sections.
2. A plate glass surfacing table comprising a
metal top plate having a ?at upper face and a
plurality of intersecting spaced longitudinal and 50
transverse ribs projecting from the lower side of
the plate and integral therewith, the upper side
of the plate being provided with a plurality of
intersecting longitudinal and transverse slots in
line with said ribs dividing the upper face of the 55
2
I 2,1s4,7ga
table into'rectangular sections, said'slots extend- “' of the plate being provided with a plurality of
ing down into, the ribs.
intersecting longitudinal and transverse slots in
3. A plate glass surfacing table comprising a
metal top plate having a ?at upper faceand a
plurality oi’ intersecting spaced longitudinal and
transverse ribs projecting from the lower side of
the plate and integral therewith, the upper side
line with said ribs dividing the upper face of the
table into rectangular sections. and a plastic ?ller
in said slots.
WILLIAM OWEN.
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