US1578724A - Grab bucket - Google Patents

Description

'March 30,1926.

Y w. B. GREGG GRAB BUCKET i @4M .0M

MAK/a 6R66@ f Mrch 3o, 1926.

W. B. GREGG GRAB ucKsT Filed May 23, 1924 f 5 Sheets- Sheet 2 March 30 ,1926. 1,578,724 7777 W. B. GREGG Y GRAB BUCKET Filed May 2:5, 1924 s sheets-sheet s IIII Il To all whom t may concern:

A Patented Mar.- 3G, 1926.

A f-1,57 s,724

WILKs B. GREGG, or CHICAGO, ILLINOIS.

GRAB BUCKET.

Application mea May 23, 1924. serial ivo. Ji5-,34a

Be it known thatI,.WILKs Chicago', inthel county of Cook and State of Illinois, have invented certainnew; and useful Improvements in aGrab Bucket, of which the following is a specification.

This invention relates to grab buckets or excavating devices of the clamk shell or hinged jaw type and particularly to ldevices of this character which vare intended for digging purposes such as excavating earth or handling heavy material.

The principal objectionable feature of the ordinary clamshell bucket is its ineiciency in digging when the lifting cable acts upon its closing mechanism. In other `words,'

lwhen the lifting cable starts f to close the bucket Vit also has a tendency to raise the'f same so that the v4jaws are not forced into the material. One of the particularjfeal tures of the'present invention is the provision of suitable closing mechanism where by the action of the lifting or closing cable will have a comparatively strong tendency ,toward forcing the jaws into the material to be acted upon.

The objects of this invention are to provide an improved grab or excavating bucket;

to provide a grab bucket having a novel form of closing mechanism whereby the strains 'on the closing cable will tend to force the jaws into the material; to provide a combined toggle and rope and pulley closing mecha nism for a grab bucket and, in general, tc provide such an improved apparatus as will Vbe described more fully hereinafter. y In the accompanying drawings y illustrating this invention;Y f Y VFigure 1 's a side view showing the bucket closed;

Figure 2 is a side view showing the bucket open; Figure 3 is a sectional plan view taken on the line 3-3 of Figure 2;

Figure 4 is a Vfront view; Figure 5 is a sectional view takenfon the f line 5 5 of Figure 2;, j j i Figure 6 is a front'view of one of the scoops or jaws; and f Figure` 7 isa sect`onal view taken `on the line -A of Figure 6. I j s In the artic'ularform Vof the invention as shown 1n thesedrawngs thefbucket 10 isprovided with two scoops or jaws 11 and y B. citizen of -thev United States, residing at U-shaped as shownv'in Figures 6 and '2'V and have upwardly extending projectionsl for engagement with vthe V.sides ofthe bucket. The longitudinalportions ofthe lips have cross shaft 20. This .shaft is also' provided with a lever arm21 which is keyedI or other!V wise securely fastened thereto.v i I y The jaw'12 is provided-with "arms 22:

vwhich are pivoted on the shaft '-20 and'.v are "connected together and k'alsoconnected. with a lever arm 23,;these arms forming a comf'l bined straddle lever or vbifurcated leverzas will be readily seen from Figure 5. The arrangement of the lever arms and jaws is such that the movement on the shaft or pivot 20 is similar tothe action of a pair' of shears. The arm 21 has a bearing 24 at its outer end for sheaves 25 and 25. Thel outer end is preferably provided with a cover or housing 26 for protecting the sheaves. The arm 23 also lhas a bearing', 27 at its outer endgfor sheaves 28 and28 and has a housing29 for protecting ythe same. Y

The shaft20 is carried in' bearings 30 in the 'lower end of side bars or. frame mem- 1 l -Pairs of arms-36 and 37 are pivoted on the respective shaftsV 32 rand 33'xand are prodownwardly extending vtapered flanges l16 vided at their; lupper ends with segmentalVV gears 38 and 39 which engage Vwith* each' other so that the arms must swing 'in -unison. The outer ends of these armsare connected by pairsofy links 40 and 41 to the outer sides or corners of the scoops 11 and 12 being pivotedfthereto at.42 and43. rIhe respective pairs of arms and links are pivlotally. connected vby cross shafts 14 and 45. It will be seen that the respective pairs of armsl comprise toggles which will give a powerful finalclosing movement.

arrangement will be "readily understood The bucket opening orsupportiig cable i a from Figures l, 2 and a.

y terterence.

Two supportingl members such as cables and t7 each have one end connected with the outer edge ofthe' scoop or jaw l1 and the opposite enfdc'onnected with the outer edrgeoiv the scoop l2..

The cable 46 passes under a sheave 48' on the shaft 32 and then up over a sheave titl/"andi down under a sheave 50 on the shaft 83 and then tothe jaw l... The cable fYpa-sses' ina similar manner under a sheave 5l,then up over a sheave- 52 and down und'er'a sheave' 53 tothe' opposite sideA oftheV buclet. The

sheaves 419 and 52 are carried" on" a shaft' 54e. which' is also provided' at the center with supporting pulley The. sl'ieavesill-Q.v and 522 are also protectedby housing members 5b.

and 57; which are carried by the shaft 534'.'

T he buclret supporting' cable 58 may be fastened-directly to the sh'ea've 55 whena'single line' isto .be used but if' al double line is to be usedv the cable 58 may' passv under the sheave and up to the boomer'. the derricl oi machine with which the bucket is to 4be used. The cables 456. and; l? are provided' with'. stops 58' which are adapted to engage with stop' plates or projections. 594 on the head block 35 ini order te limit the swinging movement ot the jaws. j A

The` bucl'etclosing vand lifting` 'cable 60 extends trom-the boom or support (not shown) down under a sheave Glfon the shaft ltthen; over and around sheave 28, then across and around a sheave 62,011' the shaft 45, then bacltaroundl the sheave 28', then across and arounda ,second sheave 63, then up and over a sheave `(is, then down and under sheave 25, then'U across and around' a sheave v65 on the shaft let', then back and' around the sheave .257, then. back and under alsecond sheave 66` on. the sha-tt 4 4, andl then up' to a" point of fastening 'where it is becketed or secured to the head block S5. The sheave 64 Yis mounted ina bracket' 68 on the side of@ the head block and is arranged atY a suitable angle so that the cable will be in proper alignment withl the different sheaves which oft' course must be spaced and arranged in orderto peruiit the line to crosswithout in.-

l'Vhen the term cable is used'it is intended Y to indicate any suitable tlexiblemember such as rope, chain or the like which may be adapted tor the purposes set forth. Y

Then the buckcthas been loweredto durf i position. the tension on the li'ttiirsrv cable the lifting cable such power is utilized most" eiiectively for closing the jaws instead;v of

being reduced? by the tendency to litt'. the

jaws away from thev materialasioccurswith' mosti con'nnon terms o'tbuckets. 'ltwi'll' also bey noted that the lid or reinforcedl cutting: lips have a bridging' actron aci-ossi the: jaws' which strengthens the edges so that they are' not apt to be bentupwardly at the center asis common withv the. usual'forin` of buckets.

ilivhen the bucket is t'obe opened for discl-iargirY the holding or' supporting' cable` 5Sy is' drawn in or else tli'el'itti'ng cable' 603 is slaclened so that the bucketi-s supported by the. cables t6 and' 1t?. comes on these cables they litt up the outer ideesot the jaws andlswing'them open as will be readily'seen from Figure 2'. As the lower stretches of these cables swing upwardly the cables are drawn at a sharp angle across their guiding sheaves which causes a cushioning action andy prevents any undue jar when the jaws openv to their fullest posi-V tion or until the stops 58 enga-ge with the abutments on the head piece. F rom this description it will be seen that I provide a bucllzet which will be particularly etlicient in operation and which will utilize its own. weight to a large extent in effecting the proper closing acti-en as well as util'izingto the fullest extent thepower applied `thereto by the liftingfor cle-sing; cable. Havingzthus described my invention, what ll claimand desire to vsecureby Letters Patent is:

l. In a4 grab bucket',l the combination of hinged jaws. flexible holding means engagingv with the outer portions of the jaws7 oppositely arrangedV arms coactin-p;v4 with the jaws, a supporting traine in which the jaws are pivotally mounted. sheaves mounted on said frame and on saidy arms and a littf j cable roved around saidl pulley and hav-ing;v

vone end secured lo said iframe, said cable ends offsaid arms, links between the outer As' the. weight.

pivoted to' said side bars, holding means y connected to the outerportions of thel jaws,

upwardly projecting arms coacting with the respective jaws, sheaves mounted on said arms, levers pivotally mounted onthehead block, gears secured to the upper ends of said levers and connected with each other, links connecting the outer ends of the levers with the 'outer portions of the jaws, sheaves mounted at the outer ends of said levers, guide sheaves on the head block, a cable roved around said various named sheaves and having one end connected with the head block, the arrangement being such thatwhen a tension is placed on the cable for lifting thebucket it tends to swing the'- arms and levers inwardly to force the jaws together,

l. substantially as described.

4. A grab bucket comprising a head block, side bars dependingfrom said block,jaws pivoted at the lowerv endof said bars, a cross shaft above the block, a pair of sheaves mounted on said shaft, a pair of cables passing over said sheaves and having their ends connected to the outer portions of the bucket,guide rollers on the head block for said cables, a holding cable coacting with the shaft, a lifting cablefor closingjthe bucket and means coacting with the lifting ycable and the jaws of the bucket for swinging the jaws together.

5. In a bucket, the combination' of a frame, jaws pivotally mounted on said frame, oppositely disposedlevers pivoted to said frame, interlocking means for causing the levers to move together, links between the levers and the outer portions of the jaws, means tending to swing the free ends of thelevers inwardly when the bucket'is to be closed and means' for supporting the bucket at'the outer portions of the jaws for openingfthe same, substantially as described.

6. The combination with a grab bucket having two or more pivoted jaws, of toggles for each jaw adapted to be actuated by the lifting cable and tending to close the ljaws of the bucket.

7. In a grab bucket, the combination of a supporting frame, a shaft mounted in said frame, a pair of hinge arms secured to said' shaft, arjaw mounted on saidarms, -a lever arm also secured to the shaft, a second pair lof hinge arms pivotally`r mounted on said shaft, a jaw secured to said arms, a lever varm connected with said last'named hinge arms and means lc'oacting with said lever arms and means for opening and closing the jaws.

8. In a grab supporting cable, a cross shaftvsecured to said cable, sheaves on said cross shaft, a pair of cables passing over'saidsheaves, a frame, jaws pivotally connected to said framel and having their outer portions secured to the ends Vof said cables, guide wheels on said frame for said cables, upwardly `and outbucket, the combination of ai wardly projecting arms coacting with said jaws, sheaves at the upper ends of said arms, levers pivoted to said frame, gears lSO secured to the upper ends of the levers and engaging with each other to cause the leversr to move simultaneously, links connecting the outer ends of thelevers to the outer portions of the jaws, ksheaves mounted lat the upper ends of said links, guide sheaves on said frame, a cable for closing the jaws and around said sheaves andconnected withv the frame as hereinbefore described.

9.' A digging lip `for buckets, ,having a relatively sharp cutting edge and having llongitudinal and transverse ribs on the lower side thereof. f

l0. The combination with a bucket jaw,

`lifting the bucket, said cable being rove of a substantially U-shaped lip having transverse riby and a plurality of longitudinal ribs on the lower side thereof..

l1. The combination with bucket jaws, of l l closing levers and closing toggles for each jaw and means coacting with both the levers and toggles to close the jaws.

12. The combination with a grab bucket, of cable jaw opening means, stops forfregulating the opening movement, closing levers and closing toggles for each jaw coacting 1 with said jaws and a cablefor operating said levers and toggles for clossubstantially as described.;

13. In an excavating bucket, the combination of a Vheadblock,`arms secured'to saidy connected to head block and jaws pivotally said arms.

14;. In an excavating bucket, the combination of two or more pivoted jaws, a head block and means `for supporting the hea-d block at afixed ydista-nce from the jaws.

' VVILKS B. GREGG.

ng the .jaws,

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