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Nov. 5, 19%. }
2,410,765
K. VON HAGEN
DEVICE FOR DREDGING GRAVEL OR THE LIKE
Filed March 8, 1941
2 Sheets-Sheet 1
,o w
TN .
Attorney.
Nov. 5, 1%46.
2,410,765
K. VON HAGEN
DEVICE FOR DREDGING GRAVEL OR- THE LIKE
Filed March 8, 1941 '
2 Sheets~$heet 2
//7ke/7z‘0r: "
urt von Has-2n
by M Q, Mums/w
A it “may,
2,410,765
Patented Nov. 5, 1946
*uNirEo _' STATES PAENT OFFICE
2,410,765
DEVICE FOR DREDGING GRAVEL OR
THE LIKE
Kurt von Hagen, Wissel, near Kleve, Germany;
vested in the Alien Property Custodian
Application March 8, 1941, Serial No. 382,443
In Germany March 8, 1940
5 Claims.
(C1. 37---117)
1
2
,
This invention relates to devices for dredging
ground at the end of the working stroke with
gravel or the like from rivers or from so-called
the aid of a carrying rope and a displaceable
dredge holes and the like.
pulley block and thereupon carried freely sus
Up to the present
pended from the carrying rope to the place at
time there have been used for this purpose dredg
which the material is discharged from the buck
ing buckets operated by ropes or cables. Such
et. When carrying the bucket back to the place
dredging buckets are ordinarily operated in such
at which dredging is again to be commenced,
a manner that the material to be removed by
said bucket will arrive at the ground only shortly
dredging is drawn by means of a bucket in up
before commencing its working stroke.
ward direction along an inclined surface, where»
This is accomplished by my invention in an
upon said material is discharged at the end of 10
extremely simple way solely with the aid of a
said surface from said bucket. Thereupon the
carrying rope which may at any time easily be
empty bucket is again brought back to the place
?xed and with a pulley block through which the
at which the dredging is to be done. This is
rope pulling the bucket is conducted.
accomplished by means of a system of ropes or
In the drawings which form part of this speci
cables adapted to move said empty bucket in a
?cation I have represented an example of a con
downward direction along said inclined surface
struction of my new device for dredging gravel
so that said bucket will slide along said surface
or the like from rivers, dredge holes and the
on the ground until it has arrived at the place
like. In the drawings Fig. 1 is a diagrammatic
at which dredging is commenced. In this man
view of an assembled device constructed accord
ner of operation of the bucket the useful path of
ing to my invention, Fig. 2 a detail view of the
motion of the bucket forms only a relatively
bucket forming part of said device, Figs. 3 and 4.
small part of the total path of motion of the
detail views of the aforesaid pulley block, and
bucket with the result that the latter will be sub
Fig. 3A is a sectional view taken along the line
jected to considerable wear and will require a
3A-3A in Fig. 3.
relatively large power for its operation. More
over, the known plants using dredging buckets
Referring more particularly to the drawings,
of this kind, which are drawn along an inclined
plane, are connected with the further disadvan
the ‘bucket l is, drawn in known manner by
means of the pull rope 2 for forward motion of
the bucket, and the pull rope 3 associated with
tage that the bucket while being moved down
ward along said inclined plane and over the ma 30 the former is drawn for backward motion of
the bucket, both of said ropes being carried over
terial to be subsequently dredged will carry with
rollers and 5, which are fixed to a mast 6, and
it a considerable part of the latter. In case
wound onto the drums of a winch ‘i.
dredging is to be done under water scoured or
In order to impart a positive motion to the
underwashed places are likely to occur at the
end of said inclined surface. These places evi 35 bucket, that is in order to lift the bucket at the
end of its working stroke as quickly and smooth
dently will have to be again ?lled up during the
ly as possible from the ground, and in order to
upward or working motion of the bucket, such '
thereupon further move the bucket in freely sus
?lling up greatly impairing the ef?ciency of the
pended condition, the device is equipped accord
dredging plant.
In order to attain a satisfactory relation be
40 ing to my invention with a so-called carrying
tween the total path of motion and the working
path of motion of the
posed to transfer the
working stroke onto a
some kind of switching
bucket it had been pro
latter at the end of its
guide band by means of
device, in such a manner 45
that said bucket will be carried back to the place
at which dredging is again to be commenced
along a path of motion above the material to be
rope 8 which is secured at one of its ends to the
mast t and at the other of its ends to a point
at the other side of the river or the like, or on
the river itself, for instance at a point of sup
port ?oating on. the latter. A pulley block 9 is
arranged movably on said carrying rope 8, while
the pull rope 2 runs over the roller ll) of said
pulley block 9. The latter may be ?xed on the
carrying rope 8 by means of a stop l2 mounted
dredged. Such arrangements, however, are ex
tremely complicated and not at all adaptable, 50 adjustably thereon, and by means of a resilient
hook or nose 1 l engaging said stop 12.
and for these reasons have not found application
vAt the under part of the pulley block 9 are
in practice.
.
provided two- holding members l4, l5 as shown in
My invention has for its object to provide a de
Figs. 3 and ‘1, said holding members being mounted
vice for dredging gravel or other material by
means of which the bucket is lifted from the 55 swingably about bolts l3. A stop It is provided
2,410,765
3 v
4
.
on the pull rope 2 shortly above the bucket i.
The upper free ends of said holding members
I4, l5 will be moved apart when said stop 16 is
moved upwardly by the pull rope 2, but upon the
passage of the stop, the parts will return to
latched position as shown in Fig. 3 under the
force of gravity. On further upward motion .of
the stop .16 on the pull rope .2 the former will
ward motion, it will be necessary to apply su?i~
cient tension to the retraction rope 3 to de?ect
and disengage the hook or nose H from the ‘
rope 2 and stop It laterally from the bold line
position to the dotted line position shown in
Fig. 3; In case of dredging under water the weight
of the ?lled bucket will be diminished by the
weight of the water which is displaced thereby.
With the device forming part of my invention
there is furthermore no need of having the bucket
climb along slopes or the like. In consequence of
stop 12 by way of the other arm it of said bell
crank lever, the rod I9 and the lever in, thus
disengaging the pulley block 9 from the rope B.
The pulley block 9 now moves together with the
this, the wear of the bucket as well as of the
ropes will be greatly reduced. It is also of espe
cial importance that all moving parts are out~
side of the material to be removed by dredging.
engage the slotted arm ll of a bell crank lever
bucket l suspended therefrom along-the carrying 15 My new device also is essentially superior to
rope 8 in upward direction towards the place of
discharge.
known devices of this kind, inasmuch as the
bucket may be moved with far greater velocity
than is possible with known devices. In addi
tion to this, with the device forming part of my
On emptying of the bucket i the pulley block 9
together with the empty bucket suspended there
from will again be pulled downwardly on the 20 invention there will be no di?iculties in connec—
carrying rope 8 by means of the pull rope 3 which
.tion with work that has to be done at slopes, such
serves for the backward motion of the bucket i.
as'?lling up scoured or underwashed places; fur~
This backward motion of the bucket may evi~
thermore, by my invention there will be avoided
dently also be effected by'action of the weight
any kind of undesirable backward dredging which
.of the pulley block 9 and the bucket I themselves. 25 is the case when sliding the bucket along the
In order to prevent in this case the pulley block
ground as is done in known constructions.
9 from being prematurely disconnected from the
new device is especially well adapted for dredg
ing at great depth under water. The costs of
construction and maintenance of the device ac
My
bucket, a resilient lock 22 is provided at the
under part of said pulley block. The lock 2.2,
however. will release the stop if; on the pull rope 30 cording to my invention are relatively small as
2 by action of the rope 3, as'soon as the pulley
compared with the costs of known constructions.
block has again engaged with the stop 42 on the
A further advantage of my invention consists
.ropeil or when the pull rope has been braked by
therein that the device fordredging may easily
the winch v‘l. Now the bucket is still drawn back
be applied in every case and will permit the
.ward a short distance on the ground as far as to
the ‘starting point for the operation of dredging.
greatest possible utilisation of the ground. My
new construction will also dispense with the high
Fig. 3A shows the details of lock 22 when the
stop i5 is releasably con?ned above the holding
mast which is necessary with the known con
structions of cable buckets or cable dredges in
members Eli and Hi. When, however, a substantial
which the bucket is carried back by action of
pull is exerted upon the retraction rope 3, the 40 ‘its own weight. By my invention it will be pos
pull'rope flwilloccupy the angular position shown
sible to attain practically unlimited widths over
in Fig. l, and the dotted line position shown in
which the rope which serves for carrying back
Fig. 3. Thus, it is seen that the resilient lock 22
the bucket may be retracted.
,permits lateral release of stop 16 from holding
members 14 and I5.
Emptying of vthe dredging bucket proper is
effected at the place 21 at which the material is
disoharged‘fro-m the bucket by means of a stop
stop
lever lever
'23 orwill
the lift
like aprovided
closing and
at said
clamping
place. roller
‘24 or the like from the drop-door 25 of the bucket
II ‘so that said door may be opened. By pulling
the bucket backward the latter will again assume
its horizontal position, in which position the
drop-door at the bottom of the bucket ‘will again I
be closed by action of its own weight, the roller
24 now again locking said drop-door.
:The device which forms part of my invention is
connected with a number of advantages as com
pared with known devices of this kind. In the
?rst ‘place an advantage consists therein that my
:new device requires only a small amount of power
for its operation, this being due to the fact that
the ‘working stroke of the bucket is only of such a
length
is required to ?ll the bucket with the
material to be removed by dredging. Backward
motion, that is‘the idle stroke of the bucket, is
carried on for the greatest part in freely sus
pended condition of the ‘bucket above the ground
so that the total path of motion of the bucket
will be free of friction on the ground and in par
ticular there will be no impediment due to mate—
rial accumulating in front of the bucket which is
the case with known devices of the present kind.
When the carriage engages stop 12 on the back 75
Finally, the device forming part of my inven
tion has the further advantage that it can be
operated from all directions radially with re
spect to the adjustable pulley block '9. For this
purpose it will only be necessary to properly dis
place the de?ecting rollers around which the rope
for pulling back the bucket is carried.
I claim:
'1. In a hoisting device, the combination of a
trackway, a sheave pulley, a support for said
pulley mounted on said trackway, a pull cable
passing upwardly and over said pulley, means on
the lower end of said cable for supporting a load,
means on said support for preventing reverse
movement of said cable when said load has
been lifted by said cable to a predetermined
position ‘relative to said support, and means co
operating with said reverse movement preven
tion means for releasably resisting lateral move
ment of said cable, said resisting means permit
ting lateral release of said cable from said reverse
movement prevention means upon the exertion
of lateral pressure by said cable upon the re
sisting means.
‘
'2. In a hoistingdevice, the combination of a
trackway, a carriage mounted on said trackway,
a sheave pulley on said carriage, a pull cable
passing upwardly and over said pulley, means
on the lower end of said cable for supporting a,
load, means for preventing reverse movement of
said cable when said load has been lifted by said
cable to a predetermined position relative to said
2,410,765
5
Carriage, and a resilient lock cooperating with
said reverse movement prevention means for re
leasably con?ning the cable against lateral move
ment, said lock being responsive to the lateral
pressure exerted by the cable to effect a cable
release.
_
3. A device for dredging gravel or the like,
comprising a pull rope, a retraction rope, and a
bucket connected between said ropes, a carrying
rope, a pulley block mounted on said carrying
rope, said pull rope extending from said bucket
and passing through the pulley block to thereby
suspend the bucket, means for releasably secur
ing said puliey block to said carrying rope at a
position corresponding to the location at which _
the bucket substantially completes its dredging
stroke, means for releasing said secured pulley
block when said bucket is lifted to a prede
termined position due to continued pull on the
pull rope to thereby permit said block and sus
pended bucket to be moved along said carrying
rope, means for preventing reverse movement
of said pull rope and suspended bucket from said
predetermined position, said last-named means
permitting said pull rope- to be laterally With
rope to thereby permit said block and suspended
bucket to be moved along said carrying rope, a
pair of dogs pivotally secured to said block, the
free ends of said dogs projecting in the direction
of movement of said pull rope when the bucket
is lifted and being yieldingly urged against op
posed sides of said pull rope while said bucket
is in said predetermined position, whereby reverse
movement of the suspended bucket is prevented,
said dogs permitting said pull rope to be laterally
withdrawn therefrom by exerting a pull upon said
retraction rope, and means for resisting said
lateral withdrawal of the pull rope.
5. A device for dredging gravel or the like, com
prising a pull rope, a retraction rope, and a bucket
connected between said ropes, a carrying rope,
a pulley block mounted on the carrying rope,
said pull rope extending from said bucket and
passing through the pulley block to thereby sus
pend the bucket, a stop secured on the carrying
rope, means carried by the pulley block for re
leasably engaging said stop, said stop being located
at a position on the carrying rope correspond
ing to the location at which the bucket substan
tially completes its dredging stroke, means for
disconnecting said stop engaging means from said
drawn therefrom by exerting a pull upon said
stop when said bucket is lifted to a predetermined
retraction rope, and means for releasably resistposition relative to said block due to continued
ing said lateral withdrawal of said pull rope from
pull on the pull rope, whereupon said pulley block
said reverse movement preventing means.
and bucket may be simultaneously moved on said
4. A device for dredging gravel or the like, com 30
carrying rope by means of said pull rope, means
prising a pull rope, a retraction rope, and a
for preventing the reverse movement of said pull
bucket connected between said ropes, a carrying
rope and suspended bucket from said predeter
rope, a pulley block mounted on said carrying
mined position aftersaid stop has been discon
rope, said pull rope extending from said bucket
and passing through the pulley block to thereby
suspend the bucket, means for releasably secur
ing said pulley block to said carrying rope at a
position corresponding to the location at which
the bucket substantially completes its dredging
stroke, means for releasing said secured pulley
block when said bucket is lifted to a predeter
mined position due to continued pull on the pull
nected, said last-named means permitting said
pull rope to be withdrawn therefrom by said re
traction rope in a direction transversely of the
longitudinal axis of the pull rope, and means for
yieldingly resisting said transverse movement of
the pull rope.
KURT VON HAGEN.
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