US870812A - Grab-bucket and operating mechanism. - Google Patents

Description

No. 870,812. "PATENTED Nov. 12, 1907. v H. P. AND'RESEN.

GRAB BUCKET AND OPERATING MECHANISM.

, APPLICATION rum) 3015, 190a.

4 SHEETS-BR111111- PATENTED NOV. 12, 1907.

H. P. ANDRESEN. GRAB BUCKET AND OPERATING MECHANISM.

APPLIOA'I'IOI FILED NOV. 6, 1908.

4 snnn'rs sum 2.

mm mm m P m No. 870,812. v-PATBNTED NOV.12, 1907.

V H. P. ANDRESEN. GB-AB BUCKET AND'OPBRATING MECHANISM.

LPPLIOATIOI FILED HOV. 5, 1906 4 SHEETS-SHEET 8.

' v INm'MIwQ.

HERmN PANDRE'SEN.

ATTY

mTAbz'ssEs;

No. 870,812. PATENTBDQNOV. 12, 1907.

' H. P. ANDRBSEN.

GRAB BUCKET AND, OPERATING MECHANISM.

APPLIOATIOH FILED SOY- 5, 1908.

4 SHEETS-3313 4.

A U r h 1 II H mm 3wl 1 1 l a l L, IIIIHI II II K Y I h k 6 r l i 6 g-lufwfwt I 11 1 Ml UNITED STATES PATENT OFFICE.

HERMAN P. .ANDRESEN, OF CHICAGO, ILLIN IS, ASSIGNOR OF ONE-HALF TO DAVID J. EVANS,

' OF CHICAGO, ILLINOIS GRAB-BUCKET AND OPERATING MECHANISM.

To all whom it may cancer 11:

Be it known that I, Harman P. ANDRsssN. a citizen of the United States, and resident of Chicago, Cook county. lllinois, have invented a certain new, useful, and improved Grub-B ticket and Operating Mechanism, of which the following is a true. exact, and clear description. such as will enable others skilled in the art to which it appertains to make and use the same.

' My invention relates to new and useful improvements in grab buckets commonly known as clam shell grabs, and also relates t0 improvements in the operating thereto. thereby insuring the sinking of the bucket in o the material; which notwithstanding its great spread or "reach shall be of minimum height when in hoisting condition. i. e. when closed; which shall be so constructed that it will close upon and dig into the material with great power and certainty; which shall be of such form that the bucket part s proper shall constitute the largest portion of the device, to the end that a. grab bucket of maximum capacity-may be worked in an opening or batch of minimum size, without limitation by or interlerence from the mere operating parts of the bucket;

' which shall be of such form and so attached'toits operating cables that the bucket may be worked beneath the overhanging edges of a hatch opening, deck or covering inclosing the material to be moved; and finally, which shall be of very simple construction, comprising few parts of comparatively low cost.

Further objectsof my invention are to provide a clam shell or grab bucketwhich shall be capable of being swung or rotated to on y desired position and to provide simple and effective means for raising, lowering, positioning and swinging ortul'nin'g the bucket from a. single overhead point; i. e. irom and by means of the hoisting engine or machinery proper. w i

Still further objects oi my invention will appear hereinafter. l I V 4 1! y invention consists generally in a grab bucket and operating mechanism therefor, all as haoimfter desu'ibednnd particularly pointed out 'inthe claims. The invention will homo readily understood by reference to the accompunyingdmwings, forming 4 part of this specification and in which; E v

Figure 1 is a perspective View of a grab bucket operating embodying my invention; Fig. 2

Specification of Letters Patent.

Application filed November 5. 1906. Serial No. 342.087;

Patented new. 12, 1907.

is a. vertical section of the grub bucket, the dotted lines showing the bucketopened; Fig. 3 is a side elevation, showing my invention in slightly modified form; Fig. 4 is a perspective view of the bucket illustrated in Fig. 3; Figs. 5, 6. 7, and 8 are diagrammatic illustrations of further modifications of my invention; Fig. 9 is a. partial plan view In my bucket, equipped with compoundleveiage opening-devices, desired in certain uses; Fig. 10 is a detail side view of the devices shown in Fig. 9;

and Fig. 11 is a diagrammatic view showing a cable and sheaves which constitute an equivalent of the device shown in Fig. 9. p I

My device is particularly intended and adapted for handling coal, ore, and other heavy bulk material. Devices of its class commonly comprise two scoops or bucket portions adapted to form-a single receptacle when their cutting edges are brought together. When such a bucket is lowered the scoops are separated or opened, and in this opened condition they are dropped upon the loose material and by reason of their weight sink into the same. Force is then applied to raise the bucket and this force is so exerted as to first result in causing the scoops to dig iuto'the material and to close together therein, thereby inclosing a load of material. In this condition the loaded bucket is elevated and usually conveyed to a distant point, where the load is deposited by opening the bucket. This general construction and the foregoing method or manner of operation are preserved in my invention; but I have been able to markedly simplify the construction of my bucket and operating mechanism, compared with the devices and apparatus in present use.

In lieu of scoops or bucket portions which are con.- nected by the numerous pivotal joints heretofore considered necessary in a wide opening bucket, I employ two simple rigid bucket portions, each attached to a common frame by a single pivot. Thus at once it will be seen that my invention possesses several advantages over others.

A further distinctive feature of my invention as better explained hereinafter, resides in separating'the pivots of the two scoops or bucket portions is considerable distance;'whereby a bucket of great spread is secured within small vertical dimensions. The use of this single feature results in great simplification of the structure.

A further distinctive feature of. the invention, which he noted at once upon reference to the drawings, resides in an mangement of hoisting cables, which permits and enables the bucket to be swung or turned by mere manipulation of said cables-2 laterally movable trolley or truck being substituted by me in place of the complicated, rotary bull wheel l for table trolley, with opdr- I10 ating the same, ordinarily employed for the purpose, the need therefor being dispensed with.

Referring now to the drawings for. details of construction and particularly to Figs. 1 and 2, it will be seen that my novel grab bucket, irrespective of the operating part, comprises only three members, to-wit; a frame A, and two scoops or bucket. portions, B'B.

' The frame A comprises two side members a-a, and

three shafts a-a'-a*, suitable means (not shown) being usually employed for securingshafts in place. The shafts a'--a are the pivots lotthe scoops 13-13 and in this form of my bucket said scoops are rigidly secured to respective shafts, to turn therewith as hereinafter described. The shaft a is preferably fixed in the plate a--a and carries the differential winding mechanism hereinafter described. If desired each scoop may be made from a single piece of heavy sheet metal, but as the lower portions are subjected tothe greatest wear, I' prefer to make them of heavier mate- 'rial than the'upper portions which less frequently require repairs. For this reason each scoop is shown to be composed of a heavy lower portion 13 and two lighter, upper portions 6, the latter connected by a -cross bar b. The pivots of the scoops are widely separated in the frame a, and the middle or me -ting portions of the scoops underhang respective shall a. The bucket when closed, as in Fig. 1, is very low, that is, it is of little height, compared with presentdsy grab buckets of like capacity; yet when opened, as shown by dotted lines in Fig. 2, the scoops have a disproportionately or greatly .increascd reach or spread, by reason of the separation'of the pivots at their tops. The advantage of the low bucket is that it may be resdilyworked beneath the cross girders or deck beams in ships; furthermore the low llucket may be worked from a lower track. or boom. The bucket by reason of its small size may also be made of less'weight than others. When closed mgcthor tho scoops or halves B-B form a single bucket. capable of holding several tons of coal or ore.

For opening the bucket, I employ cables C--C, having their lower ends attached to cranks arm DD fixed on respective shafts a-a', or if desired the cables may be secured directly upon the sides of the scoops or bucket members B-B. other cross bars like unto I: being used in such cases (see Fig. 6). Obviously the attachment of the cables directly to the scoops is equivalent to attachment to the arms, DD, innsmuch as said arms are rigidly connected to respective scoops B-B through the medium of the shafts au. In the absence of a force tending to elevate thc frame a, the weight of said frame plus the weight of the parts carried thereby, plus the weight of the upper or inncr ends of the nn-mbcrs 13-13, is sullicient to cause the descent of thc inner ends of the scoops when rclicved from the closing force, said Weight overbalancing the lower portions of the scoops; hcncc the suspension of the bucket wholly by the cables C- causes the opening of the bucket, as shown by dotted lines in Fig. 2. (I -brepi -scnt pairs of toothed intermeshing gears or segments, on the shafts a a, and hence rigidly connected with the mcnibers B-B. These connect the twoa oop or bucket portionsB- B and eer retoi'qnnlize their movements. pn-m'cnting the unequal opening or closing thereof.

I'may employ a single cable C for each side or member of the bucket, but Fig. 1 discloses the preferred arrangement, comprising duplicate cables C, connected to respective arms D. In places where it is unnecessary to turn or swing the bucket, I use a single pair of cables C, but in all other cases, I employ the two pairs of cables (3 -0 and C C', -as shown in 1 and 4, such duplication of the cables adapting the bucket to be swung or turned with great ease, as better explained hereinafter.

As before stated the winding or closing mechanism is arranged on the shaft a. It comprises a roller having small portions E, and a large portion E, whereon'ths closing cables or chains E -E, and the hoisting cable E are respectively wound. The ends of the short draft cables E are secured to the small portions or hubs E of 'the winding pulley and their outer ends are fastened in the cross bars, b, or directly to the sides of the scoops as may be desired. The turning of the pulley on the shaft a, either releases the members, B, or draws them together. This indrawing or closing forcs'is exerted on the pulley E by means of the main hoisting cable E, wound once or rriore about the large pulley E", and

, fastened thereon. The cables E and E" are wound in opposite directions on the pulley and its hubsand the difference in diameter provides sufficient leverage to forcibly wind the draft cables on the smaller pulleys or drums and thereby close the scoops B with great diggingpower. The operation is clearly shown by the dottcdand the full lines of Fig. 2. The closing and hoisting effort is exerted on the cable E, while the cables C-'-C and C-C are slack. The slack of the cable E having been withdrawn from pulley E, and the members B.B having been closed together, the pulley E is held against further rotation by the cables Ii -E, after which the pulley E serves simply as an anchor or fastening for the cable, and further pull on the cable 15 elevates the bucket bodily. It will be noted that the cable E is located centrally in the bucket, passing over a central sheave, or through an eye E, provided in the frame piece a, and loosely ottachcd to the shafts a-'-a. From the momcnt that the members 15-8 are closctl together, the cables (-C may also be drawn t rnt to assist in raising the bucket. Obviously the dumping of the loaded bucket may be accomplished at any time by slacking the central cable E, and holding the other cables, thereby lcaring the bucket suspended by cables or (J.C'; orby holding the closing line and pulling on the opening cables C(?.

It should be noted that the winding or closing mochnnisnr of my grab buck-ct occupies a definite, unchanging position with respect to the pivots of the scoops. Being locatcd bout-nth iuitl pivots and bctwccn mid scoops it is obvious that when (0 cc is cxcrtcd thcre-. through in close thc open bucket, thc winding mechanism will rcmnin substantially stationary and cause the scoops to dig deeply into the num rial, their movcmcnt being downward la-ncuth the drum of the winding mechanism. 'l'ltc t 'ficcf1|al luiscning and digging of cvcn closcly packed, hravy mutt-rial, such as iron ore, is thus insured. actual power. lu-ingndded to thc weight of the bucket. to drive thew-oops downward.

The mmnsihat I prcfcr for carrying the buckct and or moving the zsmnlulcnslly l' llll'lll' a plurality at hurlwt in t lib I I i ning of tho hlu'itot; particularly whcro M vnrinulhl s huuvy drum or when the in i l in pimtyor sticky material illy iron ilm-li from the bucket whcn in much castes I prcier to corntwoon the opening cables and tho monitor shown in Figs. 9 and 10, or

ioul. iucrlmuimu shown in Fig. ii. The 'n in Figs. 9 and i0,

innuro lb or tho closing ll grub huciwi. which no uni.

tho hut'iwt. by on oquivn ,i tiuvirwt show ll lzll llul1h:your scgmoulat U and G", the former l u l .h the oporung cable (1 its shaft, while the sogl to its tlhoii. a. This device is duyuinfl hoing provided'for each 'lho our portion of G is about i this port 0, hence the purchase upon the. opposite bucket p is doublod, M compared with the arinowhoro in the drawing. The gilt oi the central portion of the i in tho opening opemtion. A y the construction shown in oi bucket shown in Fig. 4 is \u orm ii is provided with a u in posted downwind be- 0 upward over the sheave ur low-rug,- o mcmht-r or limit ningoumut shown 0 oi'icrtivmuw oi tlw wci bus doublm shulhtr of wt in secured Fig. iii w wruiu tho typo mnpioyoti. in this rum t i iWU and tho tl'ilflilllliflt'il' i'lii huitmttut c I :lfil i o llrt: ii, obviously i'ncrclwmg the purchase b twin-n th immu A and tho Iuwnber ii. I i

i (ll-sift! that it. shall bc undorsmod that the initial and ii tit sll't tl tho nuntituuu; hoisting effort my be I l mu null-r clump llll l lt lll'k t i, (tilili'iliit'ti by tho control cable, u, M olicntivuiy mt with tho rt-vcttunrrangcmcnt oi the cabh's. h'm-ribod lu'ruin, Ami to the lwltliglng pr manipulation ui iho' but-iu-t i Zi g 0mm rubios, tho pbttirubu' tum-lions Much the cables .70 rt-quim, o buriut'm within tho lmtly-nf n bucket m run my! r u hlt'tt, ii omploycd with tho diagonal r :t m-rhut i :iil'll'n or sin-awn on tho 0 u 'luligcutt-bl Y boom or irolloy. uiinwn tho btwlwt, t. i 1mm, by ngw lilting llit' lt-m im. ui tho crtbhm in tho minim-r liorm n.

bow tit-m'riiwtl. I A is still iuttiu-r .wniiiirnti ms oi my llivvllunu me 1,, o w ll w ll iw pt-rt't'ivcii byolhcrs. i do not. mum", my tint In iiwnpt-rilirstrut-lurch hon-in shown and drm'riiwd.

i my im'vution. i claim as iv m-tntmb' Fl substnuliully no dwcribt-d.

twisllliii tho imrlwt,

and the opening of single. non-contra aroma 8. The Improvements herein described, comprising a, grab bucket. in combination with opening, sud ciosing hoisting-cables thorctor and suitable laterally movable, but o herwise relatively fixed. cabiocurriers or sheaves qtlrteringly arranged above the bucket, and at least two of s id cables extending from a single point on the bucket over two of said sheaves, substantially as and for the pnrpose specified.

4. The improvements herein described, comprising a plurality of cable sheaves. in combination with n. laterally movable, non-roiative support for sold sheaves. a grab bucket, cables whereby said bucket is suspended from said sheaves and said shcnves. said cables and said bucket bPing so-relnted, that mild bucket may be turned by slackening and tensioning snid cables, substantially as described 6. The improvements -hcreln described, comprisi. .g a, isternlly movable support. in coinbiuntlon with a able sheave centrally mounted thcrcon. other sheaves also mounted thereon mid spaced about the iirst mentioned or centrnLn' -mve. a grab bucket. a control operating cable whereon rm; bucket is suspended from said central sheave and II pair of operating cnblcs each on its own sheave and extending to a single, non'cenirnl point upon the bucket, whereby said cables aid the suspension of sold bucket and by which the bucket may be turned or twisted. substantially as described.

6. The lmprovements herein described, comprising a laterally movable support, in combination with a control cable sheave mounted thereon, other shenres also mounted thereon and spaced about the iirst mentioned or central sheave, a grnb buckci. a central operating cubic wlicrclm the bucket is suspended from snid'central sheave. and two pairs of operating cables, each pair extending from :1 i point-upon the bucket whereby the bucket ls suspended from suit! spaced sheaves. substantially as described.

7. The improvements herein described comprising n frame, in comb nation with widely separated pivots tin-r on, substantially triangular scoops mounted on resfrcth'c pivots and adopted to cimm beneath said frame, and suitable scoop oponim: and closing means including hoisting cables, substantially on described.

8. The improvcrncl s licrciu described. comprising a grab bucket composed of n'frame, in combination with scoops having their upper ends pirotniiy attached to said frame, the plvoinl nxw oi! tho scoops bciug scpnrnte thenou. uud suitable scoop upcruting Iucnns provided upon said frame, bcnenth suid pivots. substantially as described.

9. The lniprovcun-nm iicrciu tlt'sci'ihcd comprising a frame. in combination with sc iurnlc scoop pivots thereon, two scoops having pivots, sctmpcinniuy: litmus muiu-clinz snid scoops be ncurh snid'i'rmuc and lmiiultn: and upornlin: cubics r opculng and closing mild scoops und hoisting ihc (it-vi on a whole, subatnntiully as dcscribcd.

10. The improvements llt'l't'lll dvsrribcd. uninprisln; n frame. in combination with huckct portions. llnicpcnth-utLV pivoted on said irutuc and widely scpui'utcd thcrcon. but adapted to cium toprctlu'r :it the bottom to cutmplcle a grab bucket, monm for opening suid buckct nud dlilercutial winding and holslh-u moans extruding helm-cu and conul-cilng snid scoops is'i t'nili i iilll frulnc. sulndanlin y 1 described.

11 .'ilic irmrrorcmontn luu'cln dcscribcd. comprising a grub bucket, hul'ilu: nprniiii: uud closing nlombcrs. in combination with lili'flllll for sustaining and hoisting said bm'kct nnd a cable mlnplml in aid in suslniuiuc and imistin mid-bucket, tho lowcr cud of said cubic bclug ntlm'hvd in tho buciu'l at n point distant from in. V n- 1 Min tin-root, whurcby rclullvcly interoi tcnsiqu my b t-xi-rlmi in rollilc the inu-itcl on said axis. substnmlniiy n; dvncriisnl.

l2. 'i'iw iluitrurcnu'rtn lu-rclu descrliu-d. r-nnprlsinc n al'ub hurlu-i inniuu ngwniuu and closing m hm ivimtii-m with u l'l'itii'.il i-porullmr cubic. pairs or in. wallow-rotting ('lllllt' l, n uuliublilnu'ruliy illl villlh mppnr: mid ultmtva'n tlu-rcwu. mm f r cuclt of said cabins. substaniluliy tm liciu'rli-b-i.

iii. Tlw inqu'n cmvtdn iwrcin dcncrlbai, comprining 1 their uppl'r t-uds iixcd upon rcspeciire grab bucket, composed of a frame, .in combination with rigid scoopsbavlng their upper ends pivoted thereon, a winding or closing: mechanism inclosed within and by said scoops, opening cables attached to respective scoops, and

.nnotber operatin cable attached to, said closing means,

' scribed.

1.). The improvements herein described, comprising a frame in combination with a. winding mechanism thereon. soups pivoted on said frame above said winding mechanism. an operating cable extending between the pivots of the scoops and attached to said operating means and other npcrating cables connected to respective scoops, substantially as described. T

16. The improvements herein described, comprising a frame. in combination with scoop citsing or winding means in the lower part of said frame. single member sc ops adapted to close beneath said frame and having their upper-ends distantly pivoted separately thereon at points \vidcly apart and above said winding means and Mliiflhle nill-i'tlilllg cables connected with said winding nu-nns null said scoops, substantially as described.

17. The illlpruVPllli-fllfl herein described, comprising a frame. in combination with closing or winding means thereon, scoops adapted to close beneath said winding menus and separately pivoted to said frame at diiferent pclnls above said \vimlinc means and suitable e ualizing moans joining snizl scoops. substantially as described.

irb'thc mprovements herein described, comprising a frame. in combinatlmr with single member scoops adapted t close beneath said frame and having widely separated upper ends plrotally mounted upon said frame, opening (ll'lilP runner-ted to respective scoops and a closing cable suitably connected to both scoops at points wltblnthe aam'c. substantially as described.

lb. The improvements herein described, comprising a frame. in combination wltlrsco'ops separately pivoted on mil frame and adapted to close beneath the same, an

'eqnalizcr connectinr. said scoops, opening: cables. compound leverage devices connccting'tbe same with regpective scoops and u closhn, cable connected with ltfli ll scoops: substantially as described.

24. The improvements hereln'described. comprising a frame. in omblnutlon with shafts tbcreimacoopa arranged on respective shaft and adapted to close beneath said frame. equalizingv means connecting the upper ends of solid auroops. scoops opening arms or levers, a winding mechanism mounted in said frame beneath said shafts and connected wlthmbl tlcunps and suitable hoisting cables. substantially as described.

21. The improvements herein descrilied, con\prising a frame. in combination with a dllfercntlal winding mechanism thereon. scoops pivoted on said frame abwe the winding mcchanism'und adapted to close together beneath the winding mechanism. substantially as described,

.2. The inlprm'cnmnts herein described, comprising a frame. in combination with a-ditferential winding mcchaninm thereon. the scoops pivoted on said frame above said winding mechanism and adapted to close together beneath mid winding mechanism. an equalizer connecting mid scoops and command leverage devices connected with mild scoops for running tbe veune, substantially as deucrliu-d.

23. The improvements herein des ribed. comprising a suitable trolley, in.-comblnullon with a central sheave ther on. other sheave quartered about the some on the trolley. a grab bucket, pairs of cables extending from Mid bucket over the quartered sheaves on the trolley and a crntral cabbcxtcndlng from the bucket over said central mhcu re. suhstantiaiiyas described.

21. The improvements herein described. comprising a frame. in combination with scoops having their upper ends pivoted thereon, dllferential closing means on the frame beneath the scoop pivots, suitable opening cables connected with respective scoops and a closing cable connected with said closing means, substantially as described.

25. The improvements herein described, comprising two scoops. each a single rigid member, in combination with means pivotally joining the upper ends of said scoops, a suitable equalizer. scoop opening cables connected with respective scoops and a central closing cable-connected with bothscoops at points below the-upper ends thereof, substantially as described.

26. The improvements herein described, comprising two scoops, each a single rigid member,incombination with means plvotally Joining the upper ends of said scoops, a suitable equalizer. pairs of scoops opening cables connected with respective scoops and a central closing cable connected with both scoops at points below the upper ends thereof, substantially as UBBCllbQd.

27. The-improvements herein described. comprising two scoops, each a single rigid member, in combination with means plvotaily joining the upper ends of said scoops, a suitable equalizer and non-coincident sheaves, one for each cable, said scoop opening cables connected with re spective scoops and a central closing cable connected w th both scoops at points below the upper ends thereof, substantially as described.

28. The improvements herein described comprising a frame, in combination with substantially triangular scoops,

no equal number of pivotal shafts in said frame whereon the upper ends of the scoops are mounted, said scoops being adapted to close beneath said frame. scoop closing means provided in the frame beneath said shafts and opening and closing cables attached to said scoops and to said closing means respectively, substantially as described.

29. The improvements herein described, comprising a frame, in combination with a plurality of shafts therein. substantially triangular scoops, each mounted on one of said shafts, such pivotal shafts and the 'upper ends of said scoops being widely separated, a winding mechanism arranged in said frame beneath said shafts for closing said scoops and hoisting cables attached to said winding mechanism and to respective scoops; substantially as described.

30. In a device of the class described. a substantially triangular frame, in combination with a pair of scoops having their upper ends pivoted therein, differential closing means on said frame beneath the scoop pivots, an arm rigidly connected to each said scoop. a pair of cables attached to'the' outer end of each said arm and adapted to open said scoop and tnrnthe same on its vertical axis, and a combined closing and hoisting cable connected to said differential closing means. substantially as described.

31. in a device of the class described, a suitable frame, in (combination with a pair of scoops having their upper ends pivoted therein. equalizing means connecting the upper ends of said scoops, differential closing means on said frame. an arm rigidly connected to each said scoop. a pair of cables attached to each said arm and adapted to open said scoop and to turn the same on its vertical axis and :1 hoisting cable, connected to said differential closing means. substantially as described.

3:1. in a device of the class described. a suitable frame, in combination with a pair of shafts mounted in said frame, co-actlng scoops having their upper ends mounted on respective shafts. dlfl'erential closing means inclosed by said scoops beneath said shafts, opening cables suitably connected with respective scoops, and a central cable connected with and actuating said differential closing means, substantially as described.

nectcd with said closing means. substantially as described.

34. in a device of the class described, a suitable frame. in combination with a pair of shafts mohntcd in said frame, co-acilng smopsmounled on said shafts. differential closing means, a pair of cables connected with t-acb said scoop and adapted .to open the same and to turn the device as a whole, and a closing cable connected to said closing means, substantially'as described.

35. In a device of the class described, a suitable frame, in combination. with a pair of shafts mounted in said frame, a pair of co-actlng scoops mounted on said shafts, intermeshing segmental gears on said shafts, diflerentia l closing means upon said frame, opening cables and a closing cable, substantially as described.

36. In a device of the class described, a suitable frame, in combination with a pair of shafts mounted in said frame, a pair of uracting scoops mounted on said shafts. an arm'rigidiy secured to each said shaft, suitable opening cables connected with said arms, diflerential closing means mounted upon.said frame and a suitable hoisting cabic connected therewith, substantially as described.

37. In a device of the clam described, a suitable frame, in combination with a pair of shafts mounted in said frame, a. pair of coacting scoops mounted on respective 2O shafts, an arm rigidly secured to each said shaft, a pair of cables attached to each arm and adapted to open respective scoops and to turn the device as a whole, differential closlug means mounted upon said frame, and a closing cable, substantially as described.

38. In a device of the class esvribed, a suitable frame,

in combination with s'pa1r 0 scoops pivoted on said frame, equalizing means connecting said scoops, a movable support above said frame, a cable sheave centrally mounted thereon, diiferential scoop closing means mounted in said frame, a, hoisting cable attached to said closing means and passing over said sheave, othusheaves mounted upon said support and arranged quartering about said central shesve,

an arm rigidly -secured to each said scoop and a pair of cables attached to each said arm and passing over separate 85 sheaves upon said support, substantially. and for the purpose described 39 The improvements herein described, comprising a later-xiiy movable support, in combination with three sheaves mounted thereon. a grab bucket having a central o closing cable extending over the middle sheave'on said .anppor't and two cables extending over tho'other sheaves and attached to the members of said bucket for opening the same, substantially as described.

40. The improvements herein described, comprising h grnb'bucket composed'of' scoops, in combination with s closing mechanism, a central scoop closing cab1e, scoop opening cables attached to'respoctivo scoops; and suitably positioned sh eavesfor said cables, substantially as dc;-

41. The improvements hereindescribed comprising a frame, in combination with substantially triangular scoops, an equal number of pivotal shafts whereby the nppercnds of the scoops are attached to said frame, said scoops being adapted to close beneath said frame, scoop closing means and opening and closing babies attached to said scoops and to said closing mans respective y substantially .as de- 42. The improvements herein described. comprising a frame, in combination with substantially triangular scoops Q0 each pivot to the frame by a single shaft, such pivotal shafts being widely separated, a winding mechanism for closing said scoops and hoisting cabletsttached to said winding mechanism and respective scoops, substantially as j 48. in a device at the class described, a substantially triangular frame, in combination with a pair of scoops having their upper ends pivoted therein, diiferontiai ciostug means beneath the scoop pivots, an arm rigidly'connected to each said scoop, a pair of cables attached to the i0 outer end of each said arm and adapted-to open said scoop and turn the same on itsrerticai axis, and a combined closing and hoisting cable connoctbd' logaid dlderential closing means, substantially uiilsciibad ,44. In a device of the class described, a suita hie frame, in combination with a pair of shafts mounted in said frame, a pair of co-actlug scoops mounted on said shafts, intermeshing segmental gears on said shafts, diiferential closing means, opening cables and a closing cable, substantially as described. I

45. In a device of-tne class described, a suitable frame, 0 in combination with a pair of shafts mounted in said frame, a pair oi' co-acting scoops mounted or. said shafts, an arm rigidly secured to each said shaft, suitable opening cables connected with said arms, differential closing means and a suitable hoisting cable connected therewith, subetan- 35 tiaily as described.

46. in a device of the class described, a suitable frame, in combination with a pair of scoops pivoted on said frame, equalizing means connecting said scoops. a movable support above said frame, a cable sheave centrally mounted thereon, differential scoop closing means mounted in said frame, a hoisting cable attached to said closing means and passing over said sheave. other sheaves mounted upon said support and arranged quarterlngabcut said central sheave, an arm secured to each said scoop and a pair of cables attached to each said arm and passing over separate sheaves upon said support, substantially as and for the purpose described.

47. The limprovements herein described, comprising a frame, in combination with scoops separately pivoted on 109 said frame and adapted to close beneath the same, opening cables, compound leverage devices connectim: the same with respective scoops and aclosing cable connected with both scoops, subdtantially as described.

48. The improvements herein described, comprising a frame, in combination with a dllferentlsl winding mechanism thereon, the scoops pivoted on said frame above said winding mechanism and adapted to close together beneath said winding mechanism, and compound leverage devices connected with said scoops foropenlng the same, aubstan- 110 tiaily as described.

49. The improvements herein described, comprising two.

. scoops, each a single rigid member, in combination with means pivotally joining the upper ends of'sald scoops, scoop opening-cables connected with respective scoops and a central closing cable connected with both scoops at points below the upper ends thereof, substantially as described..

50. The improvements herein described, comprising two sqpps, each a single rigid member, in combination with means pivotallyjolning the upper ends of said scoops.

pairs of'scoop-opening cables connected with respective scoops and a central closing cable connected with both scoops at points below the upper ends thereof, substantiaily as described. g

51. The improvements herein described, comprising two scoops, each a single rigid member, in combination with means pivotally joining the upper ends of said scoops, and non colncident sheaves, one for each cable, said scoop open lug cables connected with respective scoopn and a central closing cable connected with both scoops at points below i the upper ends thereof. substantially as described.

52. in a device of ,the classdoscribcd, a rigid frame, in combination with a pair of scoops having their upper ends directly pivoted'upon said frame, differential closing means neath the scoop pivots, an arm extending from each said rich p. an opening cable for end-am; and a combined closing 1 od hoisting cable connected to said dilercntinl closing means, substantially as described.

In testimony whereof, i have, hereunto set my hand, this 1st day of November, i906, in the presence of two-ubscribing witnessesmanta! 1'. xnnnsnx. Witnesses;

' Cuasuis Gmnnrr HAWLIih,

F. G. Kxwn'r.

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