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.