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Патент USA US3020863

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Feb. 13, 1962
J. w. CHRISTOFF
3,020,853
UNDER-TRACK DEVICE FOR USE ON RAILROADS
Filed July 3, 1958
5 Sheets-Sheet 1
Feb. 13, 1962
J. w. CHRISTOFF
3,020,853
UNDER-TRACK DEVICE FOR USE ON RAILROADS
Filed July 3, 1958
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5 Sheets-Sheet 2
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Feb. 13, 1962
J. w. CHRISTOFF
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UNDER-TRACK DEVICE FOR USE ON RAILROADS
Filed July 3, 1958
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Feb. 13, 1962
J. w. CHRISTOFF
3,020,853
UNDER-TRACK DEVICE FOR USE ON RAILROADS
Filed July 3, 1958
5 Sheets-Sheet 4
Feb. 13, 1962
3,020,853
J. W. CHRISTOFF
UNDER-TRACK DEVICE FOR USE ON RAILROADS
Filed July 5, 1958
5 Sheets-Sheet 5
"Rice
States atent
1
3,920,853
Patented Feb. 13, 1962.
2
in a rearward direction, so that ballast that has been
' disengaged from the roadbed and is lying free in front
of the blade will be caused to travel rearwardly and out
3,020,853
UNDER-TRACK DEVICE FDR USE
ON RAILRGADS
James W. Christo?, Minneapolis, Minn, assignor to
Mannix Qo. Ltd, Calgary, Alberta, Canada
Filed July 3, 1953, Ser. No. 746,451
'7 Claims. (Cl. 104--7)
wardly along the face of the blade ultimately to be pro
GI jected beyond the lateral edges of the plow for subse
quent collection.
In contrast, the levelling blades of a sled are inclined
downwardly and somewhat backwardly in relation to
This invention relates to an undertrack device which
the direction of travel of the sled so that they do not
can be used either as a ballast sled or a ballast plow. 10 dig into the ballast encountered but press downwardly
Ballast plows are employed for removing fouled bal
on such ballast with their trailing edges to perform a
last from a railroad roadbed. A ballast plow is inserted
between the roadbed and the ties to which the track rails
are secured and is then towed along the track in this
levelling function.
of ballast and displace this ballast to one or both sides 25
In the drawings:
FIGURE 1 shows a top plan view of the device with
the blades in their raised inoperative position;
~
Hitherto, by reason of this difference in the blade
structure, it has been customary to construct ballast
position by a locomotive or other device, such as a 15 plows and ballast sleds as entirely separate devices.
winch car. As the plow progresses, it raises the ties from
The object of the present invention is to provide a
the roadbed ahead of it, supports the ties and the track
combined device which can function either as.a plow or
secured thereto, as the device passes underneath, and
a sled, as required, provision being made for movement
?nally allows the ties and track to settle back onto the
of the same set of blades between plowing and sledding
roadbed or “sub-grade” behind the device. The weight 20 positions.
of the ties and track supported by the plow is consider
The various features of the invention will become ap
able and the plow is therefore pressed ?rmly down
parent from consideration of the under-track device illus
against the ballast. By providing the plow with one or
trated by way of example in the accompanying drawings,
more scraper blades, it is possible to separate a layer
and from the appended claims.
of the track beyond the ends of the ties, this displaced
ballast being readily removable when the ties resettle,
since the lateral edges of the plow lie outwardly of the
FIGURE 2 shows a side view of the device seen in
ends of the ties. Reference may be made to L. B. Franco
FIGURE 1;
and J. C. Stein U.S. Patent No. 2,921,390 issued January 30
FIGURE 3 shows an underside plan view of the device
19, 1960 for an example of a ballast plow.
seen in FIGURES 1 and 2;
Ballast sled devices are similar to ballast plows in that
they are inserted between the roadbed and the ties and
are towed along in this position.
FIGURE 4 is a section on the line IV—IV in FIG
URE 1;
.
Sleds, however, are
FIGURE 5 is a fragmentary sectional view through
used either during the laying down of new tracks or to 35 a blade showing the connection of such blade to hydrau
perform a reballasting operation following the pulling
lic operating means, this view being taken on the line
of a ballast plow in the manner just described. After
V~——V in FIGURE 1;
the plow has removed a layer of fouled ballast, or in the
case of a new track laid directly on the sub-grade, after
FIGURE 6 is a view similar to FIGURE 5 but show
ing the parts in a ?rst operating position, the sledding
the track has been so laid, fresh clean ballast is dumped
position;
onto the track to lie on top of the ties and rails. The
function of the sled is to raise the ties up to their de
second operating position, the plowing position;
FIGURE 7 is a further view of the same parts in a
sired level and distribute the ballast evenly beneath them.
FIGURE 8 is a fragmentary sectional view taken on
Subsequently additional ballast will normally be dumped
the line VIII—VIII in FIGURE 1;
on the track between each pair of adjacent ties, this 45
FIGURE 9 is a section taken on the line IX—IX in
latter operation usually being carried out manually, since
FIGURE 8;
>
it does not require raising of the track. Reference may
FIGURE 10 is a view similar to FIGURE 9 showing
be made to L. B. Franco U.S. Patent No. 2,769,172
the parts in a different position;
issued October 30, 1956, for an example of a ballast
FIGURE 11 is a diagrammatic plan view of the device
sled.
There is much in common between the basic structure
of a ballast plow and a ballast sled, the fundamental
in operation on a length of track, when used as a plow;
FIGURE 12 is a side View of FIGURE 11;
FIGURE 13 is a view generally similar to FIGURE 12
difference being that the plow uses scraper blades for
but showing the device in use as a sled;
de?ecting ballast, whereas the sled uses levelling blades
FIGURE 14 is an enlarged view of the device in use
for smoothing out ballast. In other respects, the two 55 as a sled, the parts being shown in section taken on the
devices function in a very similar manner, each being
line XIV—XIV in FIGURE 1; and
required to move along the roadbed while lifting and sup
porting a span of track. Both devices consist of a gen
erally flat framework of rigid construction, this frame 60
work including essentially a plate of metal, upper runner
means for slidingly and supportingly engaging the ties
FIGURE 15 is a diagrammatic view showing the hy
draulic circuit for operating the blade actuating means.
The device 10 consists of a framework structure of
welded construction comprising a main plate 11 of rigid
steel, to the underside of which there is secured a cen
trally located spine in the form of a downwardly pro
jecting bar 12 extending from front'to rear along the
sled).
65 centre line of the plate 11. This bar 12 and a number
The scraper blades of a plow are distinguished from
of downwardly projecting posts 13 serve to secure to
the levelling blades of a sled in that the scraper blades are
the plate 11 ?ve under~runners 14, 15, 16, 17 and 18.
inclined forwardly and downwardly so as to dig into the
The outer under-runners 14 and 18 are slightly tapered
ballast encountered by the plow, thus disturbing such
and upwardly curved at their leading edges, and these
ballast and causing the same to travel upwardly along 70 runners together with the central under-runner 16, ter
minate at the leading edge 19 of the plate 11. The inter
the surface of the scraper blade, Additionally, the
and either scraper blades (in the case of the plow) or
under-runners and levelling blades (in the case of the
scraper blades extend to one or both sides of the plow
, mediate under-runners 15 and 17 continue beyond the
3,020,853
4
leading edge 19 of the plate 11 while constituting the
lower ?anges of a pair of I-beams 20 and 21 and form
ing the leading lower sliding surfaces of the device.
The webs of these I-beams terminate at points 22 and 23
plate 11 there are mounted four master hydraulic cyl~
inders 71, each such cylinder being controlled by a re
spective manually operable handle 72. The two more
rearward master cylinders 71 control the ?ow of hydraulic
respectively just rearwardly of the leading edge 19 of the
?uid along pipes 75 and 76 (see FIGURE 15). A pipe
plate 11. The upper ?anges 24 of the I~beams 20 and
75 leads to the rear end of each of the rearward pair of
operating cylinders 56 and 58 from a respective master
cylinder 71, and a pipe 76 leads to the forward end of
21 are inclined downwardly and forwardly to meet the
under-runners 15 and 17, pointed tips 37 and 38 being
secured to the under-runners 17 and 15 respectively to
each of these same operating cylinders. Similar pipes 77
extend beyond the forward edges of forward portions 10 and 78 lead from each of the forward master cylinders 71
conveying ?uid to the respective ends of each of the two
25 and 26 of upper runners 27 and 28, such forward ends
forward operating cylinders 55 and 57 that control the
25 and 26 being supported by the upper I-beam ?anges.
blades 50 and 52.
The upper runners 27 and 28 extend rearwardly from
Forwardly of the central bar 12 there is provided, as
their forward portions 25 and 26 along the upper side of
the device to form the surface along which the ties slide 15 shown by FIGURES 8 to 10, a continuation of said bar
in the form of a gate 89 which is pivotally secured to the
during pulling of the device under a section of track.
plate 11 at the top and the under-runner 16 at the bottom
The forward ends of the outer under~runners 14 and 18
by means of a vertically extending pin 81 that extends
are provided with short I-beams 29 and 30, the lower
through a cylindrical boss 82 formed at the rear end of
?anges of which are constituted by the forward ends,
the gate 80. The gate 80 is thus swingable between 21
the under-runners 14 and 18 and the upper ?anges 31 and
32 of which underlie the forward lateral edges of the
directly forwardly projecting position as it is shown in
plate 1]..
Towing ears 33 and 34 are provided on the
FIGURES 8 and 9, and one or more de?ected positions.
upper surfaces of the forward lateral edges of the plate
The position occupied by the gate 80 when de?ected fully
11, these ears being provided with holes 35 and 36 re
to the left is shown in FIGURE 10. Once a required po
spectively to receive shackles on the end of towing cables, 25 sition of the gate 80 has been determined, it can be held
in that position by means of a further pin 83 which passes
as appears from FIGURE 11 which will subsequently be
down through the plate 11 and a boss 84 at the leading
described.
end of the gate 80. In passing through the plate 11 this
The device is provided with four metal blade-supportin g
pin 83 employs one or other of a series of holes 85 formed
moleboards 40, 41, 42 and 43. The leading moleboards
‘40 and 42 are secured by hinges 44 and 45 respectively 30 in the plate 11 in an are around the pivot pin 81. When
the device is used as a sled, the gate 80 is always placed
to the leading edges of elongated cavities 46 and 47 cut
in the plate 11, these hinges extending rearwardly and
outwardly towards the lateral edges of the device from a
in the fully forward position. It may be moved to one or
other of its sideways positions such as the extreme left
hand position shown in FIGURE 10, when the device is
The other pair of moleboards 41 and 43 are secured by 35 to be used as a plow. It then acts as a forward continu
ation of the blade 50.
hinges 48 and 49 respectively to the rearmost edges of the
The manner of operation of the device when used as a
plate 11, such rear edges being cut in the shape of a
plow is illustrated in FIGURES 11 and 12. The device
V having its apex disposed forwardly and at the centre of
is placed under the track and all the blades are moved to
the device. Each of the moleboards 40, ‘41, 42 and 43
carries a blade 50, 51, 52 and 53 respectively, and each is 40 the FIGURE 7 position. The device is then towed by
means of cables 90 from a towing bar 91 connected by
controlled by a hydraulically operated cylinder 55, 56, 57
further cables 92 to a mounting 93 which is slidable on a
and 58 respectively, each such cylinder having a respec
position adjacent the forward end of the central spine 12.
tive piston 59, 60, 61 and 62.
transverse bar 94 secured to the rear of a ?at car 95.
Control over the transverse movement of the mounting
such moleboard and blade assembly 41 and 51, the other 45 93 along the bar 94 is effected by means of a screw
threaded rod 96 controlled by a handle 97. The purpose
assemblies being similar. It will be seen from these
of this transversely slidable mounting is to be able to move
?gures that the blade 51 is secured to the moleboard 41
the towing bar 91 to one side or other of the track to
by nut and bolt assemblies 54. The piston 60 is pivotally
compensate for curvature of the track to avoid the plow
secured to the moleboard 41 by means of a bracket 63,
the remote end of the cylinder 56 being pivotally mounted 50 10 tending to cut the corner on a curve.
FIGURES 5 to 7 show on an enlarged scale a typical
by means of a bracket 64 on a transverse supporting mem~
ber 67 which extends across the rear of the device from
the ends of the upper runners 27 and 28 to the under
surfaces of which it is secured. As appears from FIG
URE l the two forward cylinders 55 and 57 are secured 55
to the body of the plate 11 rearwardly of the two cavities
46 and 47 therein, while the more rearward cylinders 56
and 58 are mounted on the members 67.
For simplicity, no hydraulic connections have been
shown in the views described so far, the entire hydraulic
circuit being illustrated separately in FIGURE 15. It
will be evident, however, that admission of hydraulic
This assembly is towed along the track by means of a
locomotive 98. As appears most readily from FIGURE
12, the plow is being employed to “skeletonize” or plow
out the track. Initially, in front of the plow 10, the ties
99 are resting on a layer of ballast 199 which in turn rests
on the sub-grade 101. The advancing plow ‘10 slides
over the sub-grade 101, raises the track in advance of the
plow, and plows the ballast 100 out of the two sides of
the track (as best appreciated from FIGURE 11). Rear
wardly of the plow, the track settles back onto the sub
grade 101.
In order to function in this manner as a plow it is neces
sary for the blades to have a substantial sweep-back angle,
?uid to the remote end of the cylinder 56 through port 65
will cause the piston 60 to be moved outwardly of the
that is the angle which each blade hinge (44, 45, 48', 49)
cylinder 56 to bring the parts to the position shown in 65 makes with the transverse direction of the device. In the
FIGURE 6 to place the moleboard 41 and the blade 51 in
device illustrated, the sweep-back angle of each blade is
the sledding position. The introduction of further hy
45°. This may be reduced somewhat, but at the expense
draulic ?uid through the port 65 will move the piston 60
of e?iciency. With a blade angle below approximately
to its fully extended position shown in FIGURE 7 which
30°, the device will not plow at all, but when pulled with
will bring the moleboard and blade assembly to a plow 70 the blades in the plowing position merely lifts vertically
ing position. When it is desired to return the blade as
upwards and travels along the top of the ballast, no de~
sembly to either the sledding position of FIGURE 6 or the
?ection of the ballast to the sides taking place. A sweep
fully retracted position of FIGURE 5, hydraulic ?uid can
back angle of approximately 30° may thus be taken as the
be introduced through the other port 66.
minimum, although a greater angle, of the order of 45°,
On a platform 70 secured to one upper side edge of the 75 is preferred. The angle may be increased inde?nitely as
3,020,853,
5.
6
far as effective, plowing is concerned, but above .about
45° it renders the device unnecessarily lengthy and thus
tice, in fact it may be. desirable, as tending to minimise
any tendency for a “centre~bound” track to be formed
ultimately. A “centre-bound” track is one in which the
level of ballast along the centre is higher than at the
begins to introduce other undesirable factors.
The function of the gate 80 is to compensate for track
edges, thus tending to stress the ties in bending about the,
central hump of ballast. A “centre-bound” track is thus
to be carefully avoided, even at the risk of some devia
tion in the opposite direction from a perfectly ?at ballast
irregularities. . It is not uncommon for tra?ic on the track
to produce regions in which there is more ballast at one
end of the ties than at the other after the ballast has
been in position for some years. In this case, the for
ward end of the gate will be positioned to that side of
bed.
the track on which there is more ballast, so that some 10
.
An important advantage of the present invention is the
rapidity with which the device can be changed from a
ballast from that side is carried across to the other side
of the track, with the result that approximately the
plow to a sled and vice versa, without the need for re
same amount of ballast is ultimately de?ected beyond
moving the device from beneath the track. Experience
each side of the track.
has shown that when a ballast sled is being used for rais
In the embodiment described, the gate has been shown 15 ing the track onto old ballast, it is sometimes found that
a section of track is reached which is particularly bad
as pivotally mounted, as this is convenient, but clearly
a completely detachable plate could be employed. A
and which should, in accordance with good railroad prac
tice, be removed. With a simple ballast sled this is an
detachable plate would be particularly suitable if a large
impossibility without ?rst removing the sled from the
quantity of ballast were required to be de?ected across
the plow from one side to the other, requiring the plate 20 track and replacing it with a plow. The insertion and re
to be rather longer than is shown in the accompanying
moval of these devices is the most time consuming aspect
drawings.
of the whole job and it is desirable to keep the number
of these operations to a minimum. A device according
If the plow is taking a deep cut, then the front gate
to the present invention can quickly be changed over to
will nearly always be in the forward position. It is only
practical to place the gate in one of its side positions 25 take on the'function of a plow for the short section of
bad track, and just as quickly reconverted into a sled
when a comparatively shallow cut is being taken.
when the bad section of track has been passed.
The ability to make ?ne adjustments to the blade posi-‘
This application is a continuation-in-part of applica
tions is of considerable practical value when the device
tion Serial No. 669,772 ?led July 3, 1957 (now aban
is being used as a plow. When proceeding 'down the
.
track, a section of track requiring a different cutting 30 doned).
- I claim:
angle to the blades is sometimes encountered. At one
' 1. An under-track device for handling ballast under
point the ballast may be very muddy, usually in parts
railroad tracks and ties, said device comprising a gener
where drainage is bad, and then in the next section of
ally ?at framework constructed to be drawn along be
track, the ballast may be ?rm and in very different con
dition. These two different conditions require different 35 tween the roadbed and the ties while supporting the
cutting angles for best plowing effect.
weight of said ties and a span of track, said framework
comprising under-runner means secured to the underside
of the framework to space said framework above the
bottom of the device so that a substantial portion of the
When the device is used as a sled, the blades are ad
justed in the sledding position shown in FIGURE 6.
FIGURE 13 is a view of a similar nature to FIGURE 12
showing the operation when ballasting, i.e. when used as
40
ballast passes under said plate, a pair of spaced apart,
a sled. The track in advance of the device 10 is now
assumed to have been plowed free of ballast so that the
parallel, upper runners mounted on the upper side of
ties 99 are resting directly on the sub-grade 101. Fresh
ment with the undersurfaces of the ties, at least one elon
gated blade extending at an inclination to the transverse
ballast 102 has been dumped on the track from a ?at car
to rest between and on top of the ties. As the sled 10
said framework to extend upwardly therefrom for engage
direction of ‘the device, means pivotally mounting said
advances, being pulled along by towing cables 90 and a 45 blade on said framework to be movable between a plow
similar towing assembly to that already described in
ing position in which it projects downwardly and for
FIGURES 11 and 12, it raises the track in advance of it
Wardly of said framework and a ballast levelling position
self allowing the ballast 102 to remain on the sub-grade
in which it extends downwardly and rearwardly of said
in discrete piles. The function of a ballast sled has been
framework, and control means for moving said blade
fully described in the prior patent referred to above 50 between said positions and for retaining said blade, as
and also in James W. Christoif’s US. patent application
desired, at either of said positions and at any other posi-.
Serial No. 647,523 ?led March 21, 1957, the piles of
tion intermediate therebetween, the sweep-back angle of
ballast 102 being smoothed out by the blades into a
each-said blade being'of sufficient magnitude for said
comparatively smooth layer of ballast 103 in rear of
blade
when in said plowing position to de?ect ballast to
55
the sled. The ties 99 settle onto this layer 103 behind
aside of the device.
I
the sled and subsequently further fresh ballast will be
'2. An under-track‘device for handling ballast under
dumped manually between these ties. A ballast sled
railroad tracks and ties, said device comprising a gener
may also be employed simply for lifting a section of
ally ?at framework constructed to be drawn along be
track onto its‘ own old ballast without a prior plowing
tween the roadbed and the ties while supporting the
60
operation. The gate 80 will always be in the forward
weight 'of said ties and a'span of track, said framework
position when the device is being used as a sled.
comprising a plate, under-runner means secured to the
An aspect of the ballasting operation is illustrated in a
underside of the plate to space said plate above the bot-i
fragmentary enlarged view shown in FIGURE 14 which
tom of the device so that a substantial portion of the
shows a central ballast levelling ?ap 86 pivotally mount
ballast
passes under’said plate, a pair of spaced apart,
ed by hinge 87 to the underside of the plate 11 at the 65 parallel, upper runners mounted on the upper side of said
rear edge of the bar 12, this ?ap 86 co-operating with
plate to extend upwardly therefrom from engagement
the end of the blade 51 and its associated moleboard 41,
with the undersurfaces of the ties, a pair of elongated
in the manner fully described in the application just
blades respectively extending outwardly and rearwardly
referred to. When the device is used for plowing, the 70 to opposite lateral edges of said plate from a position
?ap 86 takes up the position shown in broken lines in
adjacent the longitudinal centre line of said plate, means
FIGURE 14. In this position it extends somewhat be
pivotally mounting each of said blades on said plate so
low the bottom level of the blades 51 and 53 and thus
as to be movable between a plowing position in which
tends to form a shallow channel in the subgrade along
said blade projects downwardly and forwardly of said
the centre of the track. This is no disadvantage in prac 75 plate and a ballast levelling position in which said blade
3,020,853
7
8
extends downwardly and rearwardly of said plate, and
respective ends of a said cylinder associated with a re
control means for moving each of said blades between
said positions and for retaining each of said blades, as
desired, at either of said positions and at any other posi
spective blade for retaining said respective blade, as de
tion intermediate therebetween, the sweep-back angle of
each said blade being of sufficient magnitude for said
blade when in said plowing position to de?ect ballast to
sired, at either of said positions and at any other position
intermediate therebetween.
6. An under-track device for handling ballast under
railroad tracks and ties, said devices comprising a gener
ally ?at framework constructed to be drawn along be
tween the roadbed and the ties while supporting the
a side of the device.
weight of said ties and a span of track, said framework
3. An under-track device as claimed in claim 2, wherein
said control means comprises a ?uid-pressure-operated, 10 comprising a plate, under-runner means secured to the
double-acting, cylinder and piston assembly, and manu
ally operable means connected for directing pressure ?uid
to either end of said assembly.
4. An under-track device for handling ballast under
underside of the plate to space the plate above the bottom
of the device so that a substantial portion of the ballast
passes under said plate, a pair of spaced apart, parallel,
upper runners mounted on the upper side of said plate to
railroad tracks and ties, said device comprising a gener 15 extend upwardly therefrom for engagement with the un
dersurfaces of the ties, two pairs of elongated blades, each
ally ?at framework constructed to be drawn along be
pair of blades respectively extending outwardly and rear
tween the roadbed and the ties while supporting the
wardly to opposite lateral edges of said plate from a posi
weight of said ties and a span of track, said framework
tion adjacent the longitudinal centre line of said plate,
comprising a plate, under-runner means secured to the
one such pair being disposed rearwardly of and in align
underside of the plate to space said plate above the bot
ment with the other said pair, means pivotally mounting
tom of the device so that a substantial portion of the
each of said blades on said plate to be movable between
ballast passes under said plate, a pair of spaced apart,
a plowing position in which it projects downwardly and
parallel, upper runners mounted on the upper side of
forwardly of said plate, a ballast levelling position in
said plate to extend upwardly therefrom for engagement
with the undersurfaces of the ties, two pairs of elongated 25 which it extends downwardly and rearwardly of said plate,
and a retracted position in which it lies substantially in
blades, each pair of blades respectively extending out
wardly and rearwardly to opposite lateral edges of said - the plane of the plate, and control means for moving
each of the blades between said positions and for retain
plate from a position adjacent the longitudinal centre line
ing each of said blades, as desired, at either of said posi
of said plate, one such pair being disposed rearwardly
tions and at any other position intermediate therebetween,
of and in alignment with the other said pair, means piv
each said blade being swept back at an angle to the trans
otally mounting each of said blades on said plate to be
verse direction of the sled not less than approximately
movable between a plowing position in which it projects
30° whereby when in said plowing position to de?ect
downwardly and forwardly of said plate and a ballast
ballast to a side of the device.
levelling position in which it extends downwardly and
7. An under-track device for handling ballast under
rearwardly of said plate, and control means for moving 35
railroad tracks and ties, said device comprising a gener
each of the blades between said positions and for retaining
ally ?at framework constructed to be drawn along be
each of said blades, as desired, at either of said positions
tween the roadbed and the ties while supporting the weight
and at any other position intermediate therebetween, each
of said ties and a span of track, said framework compris
said blade being swept back at an angle to the transverse
direction of the sled not less than approximately 30° 40 ing a plate, under-runner means secured to the underside
of the plate to space the plate above the bottom of the
whereby when in said plowing position to de?ect ballast
to a side of the device.
device so that a substantial portion of the ballast passes
under said plate, a pair of spaced apart, parallel upper
5. An under-track device for handling ballast under
railroad tracks and ties, said device comprising a gener 45 runners mounted on the upper side of said plate to extend
upwardly therefrom for engagement with the undersur
ally ?at framework constructed to be drawn along be
faces of the ties, a pair of elongated blades respectively
tween the roadbed and the ties while supporting the
extending outwardly and rearwardly to opposite lateral
weight of said ties and a span of track, said framework
edges of said plate from a position adjacent the longitudi~
comprising a plate, under-runner means secured to the
underside of the plate to space the plate above the bot 50 nal centre line of said plate, said blades occupying a
tom of the device so that a substantial portion of the bal
plowing position in which they project downwardly and
last passes under said plate, a pair of spaced apart, par
forwardly of said plate, the sweep-back angle of each
said blade being of sut?cient magnitude for said blade
allel, upper runners mounted on the upper side of said
when in said plowing position to de?ect ballast to a side
plate to extend upwardly therefrom for engagement with
the undersurfaces of the ties, two pairs of elongated 55 of the device, further blade member movably mounted
on said framework to be movable between a ?rst position
blades, each pair of blades respectively extending out
in which it extends directly forwardly from the apex
wardly and rearwardly to opposite lateral edges of said
formed by the mutually adjacent leading ends of said
plate from a position adjacent the longitudinal centre line
blades and a second position in which said blade mem
of said plate, one such pair being disposed rearwardly
of and in alignment with the other said pair, means 60 ber forms a forwardly and sidewardly projecting exten
sion of one of said blades, and means for securing said
pivotally mounting each of said blades on said plate to
blade member in either such position.
be movable between a plowing position in which it pro
jects downwardly and forwardly of said plate and a bal
last levelling position in which it extends downwardly
References Cited in the ?le of this patent
and rearwardly of said plate, each said blade being swept
UNITED STATES PATENTS
back at an angle to the transverse direction of the sled
1,487,723
Corbitt ______________ .__ Mar. 25, 1924
not less than approximately 30° whereby when in said
2,062,544
Weeks ________________ __ Dec. 1, 1936
plowing position to deflect ballast to a side of the device,
a ?uid-pressure-operated, double-acting, cylinder and pis
ton assembly associated with each of said blades and 70
extending between a part of each such blade and said
plate, and four separate manually operable means each
connected for directing ?uid pressure selectively to the
2,769,172
Franco _______________ __ Oct. 30, 1956
518,999
142,755
Canada _____________ __ Nov. 29, 1955
Sweden ______________ __ Nov. 3, 1953
FOREIGN PATENTS
UNITED STATES PATENT OFFICE
CERTIFICATE OF CORRECTION
Patent No. 3,020,853
"
‘
February 13, 1962
James W, Christoff
It is hereby certified that error appears in the above numbered pat
ent requiring correction and that the said Letters Patent should read as
corrected
below.
'
'
'
l Column 6, line 40, for-"plate" read —- framework’ ——.
Signed and sealed this 12th day of ‘June 1962'. -
( SEAL)
Attest:
ERNEST w. SWIDER_
_ Attesting Officer
DAVID L- LADD
Commissioner of Patents
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