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Патент USA US3093099

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June 11, 1963
E. FLIEING
3,093,089
TAMPING MACHINE FOR PACKING BALLAST UNDER RAILROAD TIES
Filed July 5, 1956
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INVENI'OP
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June 11, 1963
3,093,089‘
E- F LEING
TAMPING MACHINE FOR PACKING BALLAST UNDER RAILROAD TIES
Filed July 5, 1956
4 Sheets-Sheet 2
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June 11, 1963
E. FLEING
3,093,089
TAMPING MACHINE FOR PACKING BALLAST UNDER RAILROAD TIES
Filed July 5, 1956
4FIG‘.
4 Sheets-Sheet 5
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June 11, 1963
E. FLEING
3,093,089
TAMPING MACHINE FOR PACKING BALLAST UNDER RAILROAD TIES
Filed July 5, 1956
4 Sheets-Sheet 4
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United States Patent
rice
3,®§3,089
Patented June 11, 1963
1
2
3,093 089
TAMPING MACHmE FGR PACKING BALLA§T
producing a much better compacting e?ect and addition
ally causes a substantial reduction in the recoil e?ect,
allowing the tool to be handled much more easily and
-
1
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UNDER RAILRGAD TIES
Erich Fleing, Niedersprockhoevel, Westphalia, Germany,
assignor to Friilich & Kliipfel, Wuppertal-Barmen, Ger
many, a corporation of Germany
Filed July 5, 1956, Ser. No. 595,926
' 3 Claims. (Cl. 104—14)
without danger.
In accordance with a preferred embodiment of the in
vention, the leading edges of the tamping heads with
which the compacting is eifected are so shaped that upon
being driven forward they not only exert a force on the
ballast being compacted in that direction but also effect
This invention relates to a tamping machine, and more 10 a sideward force on the ballast in the direction of the
particularly to a manually guided tamping machine for
packing ballast under railroad ties.
In the laying and maintenance of railroad tracks, it is
necessary to tamp or pack the ballast which generally
consists of broken stone under the railroad ties. For
this purpose, so-called tamping picks or hammers were
used with which the operator would manually compact
the broken stone ballast under the tie until the same ap
peared' to be su?iciently ?rm. This manual operation,
other tamping head. This may be effected, for example,
by having the leading edges of the tamping heads, which
may be straight or curved, inclined toward each other.
Thus, for example, the axes of the tamping heads may be
arranged parallel to each other with the leading edges
straight and inclined toward each other or curved in
wardly toward each other forming, for example, a semi
circle or portion thereof. Alternately, the axes of the
tamping heads may be inclined with respect to each other
however, is very time consuming and expensive from a 20 so that the same will intersect in a forward direction and
the leading edges of the tamping heads may be perpendic
labor standpoint and did not result in a uniform and
ular‘or substantially perpendicular to these axes.
satisfactory packing of the ballast.
'
More recently there have been developed automatic
The driving means for alternately driving the heads in
a forward direction may comprise any conventional or
and which force the ballast below the ties by means of 25 known drive means and may, for example, be advan
tamping machines which are mounted on a railroad car
rapidly operated hammer-like tamping tools. The use
of these automatic tamping machines, which have been
designated rail-tamping machines, however, involved cer
tageously in the form of a piston and cylinder for each
head with the pistons being alternately driven forward,
as for example, pneumatically against the heads in the
manner of an impact hammer.
tain disadvantages as the same were relatively expensive
Referring to the embodiment shown in the drawing, as
30
and would tie up the track when in use.
'
While manually guided, power-driven tamping tools
shown in FIGURES 1~3, the power-driven tamping tool
have been proposed, the same are not completely satis
consists of a pair. of tamping heads 4’ and 4a mounted
side-by-side with their axes substantially parallel for lim
factory in operation since'a considerable amount of re
ited reciprocating movement in a forward and rearward
coil occurred during their operation which had to be
absorbed by the operator and which would frequently 35 direction with respect to the double cylinder arrange—
ment 5. The double cylinder arrangement 5 has a com
lead to injury. Furthermore, with these prior known
pressed air connection 6 and manual holding means 7 by
tamping tools,‘ the materials to be compacted was solely
which the device may be manually held and manipulated.
subjected to impact forces in a single direction so that
‘In place of the handle 7, the device can, of course, be
the same could escape toward the outside which did
40 held by any other known arrangement as, for example,
not produce entirely satisfactory or uniform results.
One object of this invention is a power-driven, manu
ally guided tamping tool which is simpler in construc
tion, maintenance and manufacture than the previously
by a strut supported on a rearwardly positioned railroad
tie or on a railroad car or the like.
As may be noted from FIGURE 3, the tamping heads
4 and 4a have the leading edges 9 and 9a respectively
disadvantages. This, and stillsfurthe robjects, will be 45 which actually exert the tamping force on the ballast.
come apparent from the following description read in
These leading edges are curved inwardly toward each
conjunction with the drawings in which:
other forming, when the heads pass each other in registry,
FIGURE 1 is a diagrammatic side elevation showing an
an arc of a circle. Alternately, as shown in FIGURE '5,
embodiment of a tamping tool in accordance with the
the leading edges 9 and 9a may be straight and inclined
50 toward each other.
invention in operating position,
FIGURE 2 is a side elevation of the tamping head of
The tamping heads 4 and 4a are screwed into the shank
the tamping tool of FIGURE 1,
pieces 10 and 10a respectively so that the same may be
FIGURE 3 is a plan view of the tamping head shown
removed and exchanged for other tamping heads for
in FIGURE 2,
maintenance and repair purposes. The ‘shanks 1G and
55
FIGURE 4 is a plan view, partially in section, of the
10a have the collars 16 and 16a respectively and the
cylinder head of the device of FIGURE 1, and,
rearwardly extending cylindrical portions 15 and 15a
known tools and which overcomes the above mentioned
FIGURE 5 is a plan view of a further embodiment of
a tamping head for a tamping tool in accordance with
the invention.
FIGURE 5a ‘shows a force vector diagram of the tamp
ing head operation.
The power-driven tamping tool, in accordance with
the invention, for compacting ballast under railroad ties
comprises at least two tamping heads mounted side-by
respectively which ?t into corresponding cylindrical
bores provided with the bearing sleeves 18 and 18a.
The inward motion of the shanks 15 is limited by the
collars 16 and 16a striking the bearing sleeves and
outer rim of the cylinder arrangement. With the shanks
10 in their innermost position, as shown by the shank
member Illa with the sleeve striking the cylinder, a strik
side for limited reciprocating motion in a forward and 65 ing portion 17 extends into the interior of the cylinder
past the bearing sleeve. Within the double cylinder 5
rearward direction, and means are provided for alternately
are the cylinder chambers 12 and 12a in which the pis
driving said heads in a forward direction. The heads are
tons 11 and 11a respectively freely move axially back and
preferably mounted in manual holding means for manual
manipulation and guidance.
The alternately driven side-by-side tamping heads al
low a substantial increase in the efficiency of the device
forth. The pistons may be driven in any known or con
ventional manner as, for example, with each piston being
driven pneumatically in the manner of a piston of a pneu
8,093,089
4
matic hammer, but with the pistons 11 and 11a being
driven alternately with respect to each other.
In operation the device is positioned as shown in FIG
URE 1 with the tamping heads 9 and 9a extending against
ency of the material to escape laterally so that there is
obtained a compacting which is considerably better than
that obtained with the prior known devices.
Within the broad scope of the invention, the leading
edges of the tamping heads may be substantially parallel
the crushed rock ballast 1 beneath the railroad ties 2 of
the railroad track 3. The device is maintained in posi
tion with an operator holding the handle portion 7 and
to each other though the same are preferably shaped as
a compressed air hose _is connected to the connection 6.
As compressedair is passed through the connection 6 into
the device, as for example by opening a valve controlled
by the operator, the compressed air drives the piston 11
While the invention has been described in detail with
reference to the speci?c embodiments shown, various
changes and modi?cations will become apparent to the
skilled artisan which fall within the spirit of the inven
tion and the scope of the appended claims.
forward so that the same strikes the striking end 17 of the
shank 10 driving the leading edge of the tamping head
described above.
I claim:
against the ballast. The downward weight of the upper
portion on the tamping head and shank member prevents
the same from being driven completely out of the cylin
der sleeve 18. The resilient force of the striking or a posi
1. A power driven tamping tool for compacting ballast
under railroad ties comprising at least two adjacent sub
tive drive such as pneumatic force or spring causes the
ward direction, and means for alternately driving said
heads in a forward direction, each said tamping head hav
ing its leading edge shaped so that upon forward motion
piston 12 to then retract. The weight of the upper por
tion of the device on the now extended shank 10 and con
nected tamping head 4 causes the same to start to retract
stantially parallel tamping heads mounted side-by-side
for limited reciprocating motion in a forward and rear
thereof it tends to force material in a lateral direction to
ward with the connected tamping head 4a by the piston
11a striking the striking end 17a. The operation is re
ward the other tamping head.
2. A tamping tool according to claim 1, in which said
tamping heads have leading edges inclined toward each
other.
3. A tamping tool according to claim 1, in which said
peated in continuous, rapid sequence.
tamping heads have leading edges curved inwardly to
into the sleeve arrangement 18. At the same time the
piston 11a is pneumatically driven forward so as the shank
member 10 retracts, the shank member 10a is driven for
ward each other.
tamping heads, the ballast material is compacted forward
References Cited in the ?le of this patent
in the direction of the blow and at the same time moved 30
UNITED STATES PATENTS
laterally in the direction toward the other tamping tool.
With the use of the tamping heads for example as shown
759,359
Ferguson ____________ __ May 10,
in FIGURE 5, as the head 4 is driven forward, the ma
959,530
Hilpert ______________ __ May 31,
terial is pressed forward in the direction indicated by the
1,415,193
Robinson _____________ .. May 9,
arrow 14 in FIGURE 5a. Upon the next stroke, the 35 1,747,939
Jackson _____________ .. Feb. 18,
ballast material is pressed forward by the tamping. head
1,779,473
Jackson _____________ __ Oct. 28,
Due to the shape of the leading edges 9 and 9a of the
4a in the direction of the force vector 13 in FIGURE 5a.
These force vectors have the forward and lateral compo
nents, as shown on the force diagram in FIGURE 5a and
upon the pressing forward of the ballast material, by one 40
of the tamping heads, the other head opposes any tend
1904
1910
1922
1930
2,482,111
2,690,135
1930
Jackson _____________ .... Sept. 20, 1949
Jackson ____________ .._ Sept. 28, 1954
449,770
Italy _______________ __ June 30, 1949
FOREIGN PATENTS
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