US1477679A - Dredging bucket - Google Patents

Description

Dec. 18, E923. Y L WZGW E. WOOLLEY I DREDGING BUCKET F'i-i d A 18 I 1 921 2 Sheets-Sheet 1 Dec. 18 1923.

E; TWOOLLEY DREDCJNG BUCKET Filed Aug. 18

1921 2 Sheets-Sheet 3 Patented Dec. 18, 1923.

EDWARD WOOLLEY, OF TORONTO, ONTARIO, CANADA.

DREDGING BUCKET.

Application filed August 18, 1921. Serial No. 493,466.

resident of the city of Toronto,co1u1ty of 7 York, Province of Ontario, in the Dommion of Canada, have invented certain new and useful Improvements in Dredging Buckets, described in the following specification and illustrated in the accompanying drawings that form part of the same.

The principal objects of this invention are, to facilitate the use of the bucket by simplifying its operation in such a manner that it may be manipulated from a single hoisting drum, and to devise a structure which will be strong and durable and very reliable in action. p

The principal feature of the invention consists in the novel construction and arrangement of parts, whereby the hail of thebucket is directly connected to the hoisting cable and the bucket. jaws are operated bylink members controlled by a latch mechan1sm suspended in an adjustably fixed posi tion from the boom.

In the drawings, Figure 1 is a perspective View of my improved bucket shown in the closed position.

Figure 2 is a side elevational and part sectional View showing the position of the parts with the jaws extended.

Figure 3 is a View similar to Figure 2 showing the position of the parts when the jaws have been dropped.

Figure 4: is a sectional detail illustrating the manner of ree'ving the hoisting cable 4 around the supplementary bucket bails.

In the ordinary forms of the type of bucket known as the clam shell two operating drums are required on the hoisting machinery, one to effect the closing of the jaws of the bucket and the other to lift the bucket. A distinct advantage in operating is gained by the use of a single hoisting drum and cable and this is accomplished in the mechanism herein shown and described.

The bucket jaws 1 are of any desirable construction pivoted together and to the bail 2 by the pins 3. Attached to the centre of the bail is a pipe 1 which extends upwardly and at its upper end is provided with a tapered block 5.

The hoisting cable is provided with a quadruple lower end 6 which extends through the pipe 4 being formed of two lengths and having the looped ends at the bottom. These looped ends are arranged to extend over the top of the bail, suitable anti-friction rollers being arranged on top of the bail. Supplementary bails 8 are pivotally connected to the outward sides of the bucket jaws and extend inwardly with curved ends over the bail, each being provided with rollers 9 around which the looped portions of the doubled cables extend.

When the hoisting stress has been placed upon the cable the looped ends draw together upon the rollers 9 to force the upper ends of the bucket jaws apart. Concurrently the upward pull of the cable lifts the bail and the jaws swivelling on the pivot pins bite into the material to be raised.

Suspended from the derrick boom at a predetermined height by means of the cables 10 is a collar 11 encircling the hoisting cable and in this collar are pivotally supported a plurality or" dogs 12 provided with teeth 13 at the lower end adapted to grip a notched collar 14 slidably arranged on the pipe 4. The dogs 12 are provided with cam surfaces 15 which are adapted to be engaged by the tapered block 5 and spread apart.

The notched collar 14: supports a pair of dogs 16 having the portion 17 on the inward side adapted to engage the notches 18 in the side wall or" the pipe 4.

The dogs 16 are pivotally connected at their outer ends to links 19 which are pivotally connected to suitable brackets 20 at the outer sides of the bucket jaws.

The tapered block 5 is threaded on the upper end of the pipe 41 so that it may be accurately adjusted in such a manner that the dogs 16 will engage the notches 18 in the pipe l immediately prior to or coincident with the release of the dog 12 from the notched collar 14.

In the operation of this device the cables 10 are adjusted so that the collar 11 is arranged at the height at which it is desired to dump the bucket. The hoisting cable is then operated and the bucket is raised until the pipe 4 and the tapered block 5 carried thereon passes through the collar 11 and the dogs 12 engage the notched collar 14, said dogs being spring held inward by springs 12. The hoisting cable is then released and as the dogs 12 on the collar 11 support the notched collar 14 and consequently hold the dogs 16 and the links 19 from downward movement, the bail moves downwardly thus pushing the jaws to open outwardly and when the notches 18 in the pipe 4 reach the teeth of the dogs 16, said dogs drop into said notches and concurrently the block 5 engages the earns 15 or the dogs 12 pushing them outwardly and releasing the collar 14 Upon the release of the dogs 12 the hoist ing cable lowers the weight carrying the bucket wide open,it beingv held open by, the engagement of the dogs 16 with the notches in the pipe 4. The bucket therefore lands with its cutting jaws open. 7 p

In the spreading aparto'f the cutting jaws it will be notedth'at the secondary bails.8 connected to the top of the buckets are moved inwardly so that theroller ends are separated wide apart and the looped ends of the hoisting cable are extended. When the bucket. rests upon the bottom the weight of the central bail and the hoisting cable causes the tube 4 to move downwardly sliding through the notched collar 14: so that the dogs 16 are,;tilted outwardly and when so tilted they break joint at the connection between their outer ends and the links 19 and the weight of thecollar 1% causes the dogs to drop to the position shown in Figure 3.

Immediately strain is placed upon the hoisting cable it pulls and the jaws of the bucket are free to swivel on their pivots and the swivelling action is assisted by the pulling of the looped ends of the cable around the rollers of the supplementary bails 8 which pushes outwardly on the top sides of the bucket. j

When the load has been bitten out by the closing, action of the bucket the continued upward movement of the cable liits the load until the tapered collar 11 and the collar 14; is brought into locking QOIIbiLCtyWltll the dogs carried upon the collar 11.. The boom is then swung to the unloading position and the hoisting cable is lowered away. The collar 11 and its dogs supportthe collar l-l and the outer sides of the bucketjaws through the links 19 and the central bail falls away opening the jaws ofthe bucket to release the load.

Following the release of the load the continuous dropping of the hoisting cable bringsthe block 5 into operating contact with the dogs 12 releasing the collar. 14.- with thejaws ofthe bucket held open by the dogs 17 and ready to takeanother load.

It will thus be seen that the operation is reduced to extremesimplicity It is merely necessaryto raise and lower the onecable to successively effect the closing of the bucket to gripthe load, then raise it, dump it and again lower it.

What I cla m as my invention is 1. In a dredging bucket, the combination with the hoistingcable, of a pair of pivotal jaws, a bail connecting said jaws, a central block 5 passes through the.

member secured to said bail andoperatively connected with the hoisting cable, a member slidable on said central member and operatively connected with the bucket jaws, means suspended independentot the hoisting cable adapted to'engage. and hold said slidable ing cable adapted towen'ga'ge and.holdflsaid slidable member while the cable is lowered to p the ucketfid iiir- 'ta 'y foimted i said slidablefmember adapted to, engage the central member in lockin ggcontact', and

links connecting said dogs with the bucket members. A: W

3. In a dredging bucket, a pair of pivotal jaws, a bail connectingsaid jaws, a member secured centrally to said bail and operative:

ly connected with the hoisting cablenand I having notches intermediate o fi the liengththereof, a pair. oflinks pivotally connected to the outer, sides of the bucket jaws a pair of dogs pivotally 1 connected to the iends pf said links and adapted to. "engage said notches, a collar encirclingsaid'central rnem; her and pivotall'y supporting said edge, a collar suspended from the derrick b 99 around the hoistingcable andhaving a ,plu: rality of dogs springhelfd inwardly to en s and hold he .a fore a dfie la nd? cam block mounted, on. the, upper end of, the central bail support adapted to, engage said dogs to release the 'linkjsuppo'rting collar.

In a dre gi g b cket-a ra er jar pivotally connected, a bail supporting said jaws, a ar mem er isidlaeennsip dte the centre of saidbail. a upplementary bail connected to the outer'si'de 01; each of; said buckets and, extending oye'r the central bail provided with rollers atthe free end, a pair of looped cable ends extending 'throu gh said central tube havingthe loo ped ends extending around the rollers of said supplementary bails, means for temporarily holdingthe outer edges of the bucket aws in thegopening of the bucket, and means for releasing said holding means, and means for retaining the jaws in the open position during the lowering of the bucket. X H 1 5. A dredging bucket, comprising, a pair of aws pivotally connected together, a bail connected to pivots and havi g; a cen-. tral tubular extension provided with of notches intermediateof itjs EELQQQllar slidably arranged on said central memthe derrick boom and having a plurality of dogs adapted to engage sai notched collar, and a block adapted to engage and release the dogs engaging the 10 bucket holding collar upon the downward movement of the central member.

EDWARD WOOLLEY.

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