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Патент USA US3056567

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Oct. 2, 1962
3,056,555
J. A‘ EISSES
GRADE CROSSING
Filed Aug. 23,’ 1960
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States
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Patented Oct. 2, 19%?
2
The grade crossing shown in the drawing is inserted in
3,056,555
GRADE CROSSING
Jacob A. Eisses, Haydnlaan 4, Bilthoven, Netherlands
Filed Aug. 23, 1960, Ser. No. 51,360
7 Claims. (Cl. 238-8)
My present invention relates to a grade crossing be
tween a railroad track and a highway, as described in my
a track consisting of a pair of rails 5 supported by trans
verse ties 6. In the region of the crossing these rails
rest on respective supports formed by two rows of longi
tudinally adjoining pedestals 7 made of concrete.
Each pedestal 7, as best seen in FIG. 2, has a pro?le
generally of inverted-T shape (right) or L shape (left)
consisting of a base 711 and an upstanding ridge 7a. The
inner portion of the base 7d forms the carrying surface
1955 now abandoned of which the present application is 10 for the rail 5 while its outer portion acts as a support for
a continuation-in-part, and to a method of constructing
one or more pavement blocks 18 which form part of the
such crossing.
adjoining roadway and are level with both the ridge 7a
In some conventional grade crossings the rails are sup
and the rail. Also level with the rails and the roadway
ported in spaced-apart relationship on a common base
are a series of trapezoidal slabs 8 which rest between the
which also carries a set ‘of spacing blocks or slabs level 15 rails on a ballast bed 20 of sand but do not bear upon
with the adjoining roadway. Since the slabs thus eifec
the pedestals 7 except by their frictional connection with
tively form part of the road surface, they tend to be de
the rails 5 through the intermediary of spacers 12, this
pressed along with their supporting base by the passing
connection being established by means of tie rods 10
vehicular tra?ic whereby the rails resting on the base are
which pass between the slabs 8 and traverse the Webs
disaligned with respect to the main portion of the track. 20 of the rails against which they are tensioned by ter
It is, therefore, the general object of the invention to pro
minal nuts 11. The trapezoidal slabs 8 are undercut
vide a grade crossing of this type, capable of being quick
along their non-parallel sides to form recesses 9 which
ly and conveniently installed, wherein the spacing slabs
accommodate the tie rods 10 with sufficient clearance to
intermediate the rails are supported independently of the
permit a limited relative vertical motion between these
latter so that any settling of these slabs will not affect 25 rods and the slabs. The clamping force exerted upon the
co-pending application Ser. No. 518,235, ?led June 27,
the position of the rails whereas, conversely, the rail tra?ic
will not in?uence the road bed.
A more particular ob~
ject of the invention is to provide a grade crossing of the
type speci?ed whose components, after assembly, can
be readily detached and removed for inspection, repair or
slabs 8 by the rods 10, through the intermediary of the
spacers 12, is not strong enough to prevent such relative
motion as the slabs slowly settle on the sand bed 20 un
der pressure of traf?c, yet the extent of this settling move
ment of the slabs is limited by the restricted yieldability
of the sand bed which is laterally con?ned between the
bases 7'5 of pedestals 7.
A feature of my invention resides in the provision of a
Imbedded in each pedestal base 7‘1 is a metallic anchor
pair of spaced-apart supports extending longitudinally of
plate 17 with two upstanding ears 17a, 1711'’ which straddle
the track, each support preferably consisting of a series of 35 the lower ?ange of rail 5 and are traversed by respective
adjoining pedestals carrying the respective rail, which are
spring clips 16a, 16b bearing upon that ?ange to hold the
sunk in the ground and between them de?ne a longi
rail in position. The inner clip 16%‘, resting against a
tudinal channel receiving a bed of plastically deformable
plate 21 ?ush with the rail ?ange, is inserted at a location
material, such as sand, whereon rest the inter-rail slabs
intermediate successive spacers 12 through the clearance
advantageously along with suitable spacing members; the 40 formed between the top of rail 5 and the adjacent slab
rails placed on these supports are interconnected by a
8; to facilitate the insertion (and, if necessary, the re
series of generally transverse tie rods which are ten
moval) of the outer clip 16'”, the ridge 7a of pedestal 7 is
sioned against the slabs and frictionally hold the latter in
provided with an access hole 7b in line with the clip
a position substantially level with the roadway sections
receiving aperture of car 17‘). The upper portion of each
terminating at the rails. The slabs pass around the tie 45 slab 8 is lined with angle irons 14 to protect it from chip
rods with su?icient clearance to be able to move rela
ping through contact with adjoining slabs and with the
tively thereto in a vertical direction; thus the slabs can
train wheels; its lower portion carries metallic abutment
settle on their supporing bed Without entraining the track
plates 15 making contact with the spacers 12.
unit composed of rails and tie rods and, furthermore,
The pedestal ridge 7a is also recessed to receive the ear
may be upwardly extracted (after a slight loosening of 50 17b of anchor plate 17, as clearly seen in FIG. 2; the
the rods) without any material displacement of the rails.
other ear l7a passes through a slot in a metal shelf 22
The rail supports, at the same time, prevent any lateral
which supports the rail 5 on the inner step of the pedestal
spreading of the sand ballast or other slab-carrying ma
‘base 7‘1. A layer 23 of sand or the like overlies the outer
terial within its bed so that this material, after having
step of that base (right, FIG. 2) or rises directly from the
been initially compacted by the slabs under load, will 55 ground (left) to the level of the adjoining ground which
cease to yield and- will hold the slabs ?rmly in place; in
carries the roadway pavement. Moreover, the lateral
practice it has been found su?icient to remove the slabs
faces of pedestal ridges 7a in line with the non-parallel
once, after an initial settling period of several months,
sides of the slabs 8 are provided with semi-cylindrical
and to add another layer of sand on the ballast bed
recesses 70 which, complemented by similar recesses in
whereupon the restored slabs will retain their position 60 adjoining slab faces, form sockets into which respective
inde?nitely.
rods 10 with their terminal nuts 11 may be withdrawn,
The invention will be described in greater detail with
upon the removal of the opposite terminal nuts, when
reference to the accompanying drawing in which:
ever the removal of a rail section is desired. The voids
FIG. 1 is a top plan view of a grade crossing embody
alongside the rails 5 are occupied by a suitable plastic
ing the invention;
sealing mass 13, preferably asphalt, which is easily re
FIG. 2 is a fragmentary cross-sectional view of the
movable .for purposes of disassembly and into which
crossing of FIG. 1, taken on the line II—II thereof but
the wheel ?anges of the rolling stock will readily cut
replacement, as well as a method of so assembling these
components as to enable their selective removal.
drawn to a larger scale;
FIG. 3 is a top plan view of the left-hand portion of
the assembly shown in FIG. 2; and
FIG. 4 is a fragmentary sectional view taken on the
line IV-IV of FIG. 2.
channels along the rails 5 as clearly seen in FIG. 2.
The trapezoidal con?guration of the slabs 8 enables
them to be positioned either with their bases alternately
facing in opposite directions in conformity with a straight
track section, as illustrated in FIG. 1, or with bases
3,056,555
3
aligned along an arcuate track section as is well known
per se.
In the installation of my improved grade crossing shown
supports and independent of the latter, said supports and
said vfoundation holding said rail sections and said slabs
substantially at the level of adjoining roadway portions,
said tie means maintaining said rail sections in only fric
in the drawing, the ?rst step is to excavate the ground along
tional contact with said slabs, and spacer means on said tie
the outline shown in FIG. 2 to accommodate the pedestals
means interposed between said rail sections and said slabs,
7 and the intervening sand ballast Ztl. Next, the Pedestals
said rail sections being provided with bottom ?anges rest~
7 are set in place within the excavation; thereupon the
ing on said supports, said anchor means comprising
metallic track unit composed of rails 5, tie rods 1t) and
projections rising from said supports adjacent said ?anges
spacers 12, held loosely together by the nuts 12, is lowered
upon the bases 7(1 and aligned with the principal track. 10 at locations between said spacer means and clip means
removably inserted in said projections in engagement with
Now, the sand layers 20 and 23 are formed to support the
said ?anges, each of said supports having an upstanding
slabs 8 and the pavement blocks 18 which are then posi
ridge extending alongside the respective rail section exter
tioned thereon; after these are properly leveled, the nuts
nally thereof, said clip means including inner and outer
11 are tightened to tension the rods 10 against the slabs.
clips on opposite sides of each rail section, said ridge
Finally the asphalt mass 13 is cast to complete the as
sembly.
being apertured ‘in line with said outer clips for enabling
removal of the latter.
When, after an initial running-in period, the slabs 8
2.. A grade crossing according to claim 1 wherein said
have somewhat settled relatively to the rails 5 and the
slabs have contacting faces undercut below their surfaces
pedestals 7, the asphalt mass 13 is partly removed to en
able a loosening of the nuts 11 whereupon the slabs 8 20 and forming clearances around said tie means.
3. A grade crossing according to claim 1 wherein said
may be extracted without materially disturbing the re
foundation comprises a bed of plastically deformable ma
mainder of the assembly; a fresh layer of sand may now
terial laterally con?ned between said supports.
be deposited upon the bed 20, of a thickness sufficient
4. A grade crossing between a railroad track and a road
to compensate for the difference in level, after which the
process is reversed and the slabs are re-inserted and re
joined to the track. Naturally, the pavement blocks 13
may be similarly ‘reset if they should have objecztionably
settled on the sand layer 23; it will be understood,
however, that this latter layer could also ‘be omitted and
the suitably shaped blocks 18 supported directly on the
outer steps of bases 7d, if the pedestal '7 is shaped as
shown on the right in FIG. 2, or on the ground (with the
type of slab shown on the left) if the terrain is ?rm enough
to obviate the need for a ?rmer anchoring of the roadway
to the crossing.
It will be apparent that, even with a narrow zone of
way, comprising a pair of transversely spaced supports
longitudinally extending below the track level at the inter~
section of the track with the roadway, a pair of rail sec
tions provided with bottom ?anges respectively resting on
said supports, said rail sections forming part of said track,
each of said supports having an upstanding ridge extending
along-side the respective rail section externally thereof,
tie means extending substantially transversely of said rail
sections and interconnecting same at longitudinally spaced
locations, a series of slabs extending between said rail
sections intermediate said tie means, a foundation for said
slabs located between said supports, said supports and said
the external roadway supported on an extension of the
pedestal base directly or through a sand layer 23 as shown
in the right-hand portion of FIG. 2, the rails 5 and their
supporting pedestals 7 will be subjected at any time to only
a fraction of the weight of road vehicles traversing the
foundation holding said rail sections and said slabs ‘sub
stantially at the level ot adjoining roadway portions, spacer
crossing and that, too, for only short periods. Substan
between said spacer means, and clip means removably
tially the full load of this vehicular tra?ic is borne, how
ever, by the main roadway section of the crossing, con
stituted by the top surface of the large pavement blocks
or slabs 8, which ?nds its own level substantially inde
pendently of the track unit 5, 10, 12 and the supports 7
thereof since it is supported independently therefrom on
the sand foundation 20 and is joined to that ‘unit by fric
tional forces only. Thus, rail traffic will remain unaffected
means on said tie means held by the latter under pres
sure between said rail sections and said slabs, projections
rising from said supports adjacent said ?anges at locations
inserted in said projections in engagement with said
?anges ‘for detachably anchoring said rail sections to said
supports, said clip means including inner and outer clips
on opposite sides of each rail section, said ridge ‘being
apertured in line with said outer clips for enabling removal
of the latter.
5. A grade crossing between a railroad track and a road
way, comprising a pair of transversely spaced supports
even if the slabs should strongly buckle because of climatic
longitudinally extending below the track level at the inter
conditions or for other reasons, yet any worn or im
readjusted by the technique described above. Moreover,
section of the track with the roadway, a pair of rail sec
tions respectively resting on said supports, anchor means
removably securing said rail sections to said supports, said
the slabs 8 will not be materially displaced by any settling
rail sections forming part of said track, each of said sup
properly positioned slab may be readily extracted or
ports having 'an upstanding ridge extending alongside the
of the pedestals 7 and the rail sections 5 due to rail
respective rail section externally thereof, a plurality of tie
borne traf?c.
rods extending substantially transversely of said rail sec
The invention is, of course, not limited to the precise
details of construction and procedure herein disclosed but
tion-s and interconnecting same at longitudinally spaced
may be practiced in modi?ed form without departing from 60 locations, a series of slabs extending between said rail
the spirit and scope of the appended claims.
sections intermediate said tie rods, and a foundation for
I claim:
said slabs located between said supports, said supports and
1. A grade crossing between a railroad track and a
said foundation holding said rail sections and said slabs
roadway, comprising a pair of transversely spaced supports
substantially at the level of adjoining roadway portions, at
longitudinally extending below the track level at the 65 least one of said ridges being provided with sockets ac
intersection of the track with the roadway, a pair of rail
commodating the ends of respective tie rods upon with
sections respectively resting on said supports and forming
drawal thereof from the remote rail section whereby the
part of said track, anchor means ?rmly ‘securing said rail
latter may be removed.
sections to said supports, respectively, tie means extend
6. A grade crossing according to claim 5 wherein each
ing substantially transversely of said rail sections and
of said supports comprises a series of longitudinally ad
interconnecting same at longitudinally spaced locations, a
joining pedestals each having a rail-supporting base and
series of slabs extending between said rail sections inter
an upstanding portion forming part of said ridge thereof,
mediate said tie means with freedom of at least limited
at least some of said pedestals having lateral ridge faces
relative vertical motion between said slabs and said tie
contacting each other in line with said tie rods and pro
75
means, a foundation for said slabs located between said
5
3,056,555
6
vided With complementary recesses together ‘forming said
sockets.
7. A grade crossing according to claim 5 wherein said
779,795
1,191,561
slabs are of trapezoidal con?guration, said tie rods ex
tending along the non-parallel sides of the trapezoids.
5
References Cited in the ?le of this patent
UNITED STATES PATENTS
590,792
690,603
Pierpoint _____________ .._ Sept. 28, 1897 0
Phelps ________________ __ Jan. 7, 1902 1
1,234,138
1,279,062
1,5 98,5 84
1,707,245
1 ,863, 145
Nichols ______________ _. Jan. 10, 1905
Burns ______________ __ July 18,
Crofford _____________ __ July 24,
Winter _____________ __ Sept. 17,
Jones ______________ __ Aug. 31,
Wooldridge __________ __ Apr. 2,
Young ______________ __ June 14,
1916
1917
1918
1926
1929
1932
FOREIGN PATENTS
237,169
Great Britain _________ __ July 25, 1925
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