US878585A - Clam-shell bucket. - Google Patents

Description

PATENTED FEB. ll, 1908.

00- om, 0 T 9 E .l E H l1 S u m f. nu E m JM. l D 5 E W2 M P@ C! AUA /w mi .LLm mv? Hm s CMN u m.. G n A l )WZ/z essa;

T-CRGULOL IATBN'I-IID PEB. 11, 190s.

C. C. WILLIAMS.

GLAM SHELL BUCKET.

APPLICATION FILED MAY 10,1907.

5 SHEETS-SHEET j,

f6. @mid N 5. P TENTBD-FEB-11, 190s.

0 878 58 0. G. WILLIAMS. u A

@LAM SHELL/BUCKET.

APPLICATION FILED MAY 10, 1907.

5 SHBBTB-SHEET 4.

CR. @wmp l 'la 5 5. LATLNTLD LLB. 11 1.909.

8 8 c. c. WILLIAMS.

CLAM SHELL BUCKET.

APPLICATION FILED MAYIO, 1907.

5 SHEETS-SHEET 5.

)7527/72 esse@ CHARL C. WILLIAMS, OF CLEVELAND, OHIO.

, cLAM-SHELL BUCKET.

Specification of Letters Patent.

i Patented Feb. 1 1, 1908.

'Application nea May 10. i907. serai No. 372.376.

To all whom it may concern:

Be it known that l, CHARLIE C. WILLIAMS, a citizen of the United States, resident of Cleveland, county of Cuyahoga, and State'of Ohio, have invented a new and useful Improvement in Clam-Shell Buckets, of which the following is a specification, the principle Iof the invention being herein explained and the best mode in which I have contemplated applying *that principle, so as to distinguish it from other inventions. f

My invention relates to improvements in ore buckets, particularly ore buckets of the clam-shell type.

In using the term ore bucket it should be prefaced that, of course, such bucket is adapted for handling other materials as well as ore; the field indicated7 however, presents one of its larger fields of usefulness.

The object of said invention is to provide a bucket of thetype indicated that will be economical in construct-ion and also in the power required to operate the same, being operable b means of a single rope or cable, a further o )ject being the Vprovision of means whereby such buckets operation shall be more or less automatic in character.

'To the accomplishment of these and related ends said invention consists of means hereinafter fully described and particularly .pointed out in the claims.

The annexed drawings and the following description set forth in detail certain mech- -anism embodying the invention, such disclosedmeans constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings: Figure l represents in end elevation a bucket embodying my improved principles of construction, such bucket being represented in its closed position; Fig. 2 is a side. elevation of such bucket in the same closed condition as shown in Fig. 1; Fig. 3 is a side elevation of such bucketin its open condition; Figs. f4 and 5 are, respectively, a side elevation and an end elevation of an automatic release designed to be Incorporated when desired 1n the structure illustrated in the preceding figures; and .Fig

6 is a broken longitudinal section taken through the scoops 1n their open positlon.

, Having reference, first of all, to Figs. 1, 2, and 3, particularly, the rclativel fixed portion of my improved bucket wil be seen to comprise a frame A. This frame consists primarily of four side-plates a a iu which are transversely mounted three shafts of, a2 and a3, whereby such side-members are kept properfv spaced and arigid frame structure atthe same time provided. These shafts have an additional function, Vas will be presently set forth. The bucket proper comprises two scoop members B B, the form of which may be varied to suit the character of the service in which the bucket is designed to be employed. Such scoop-members are pivotally connected at their innerends by means of two bifurcated arms B B2, preferabl of 'cast-metal construction, the lower en s of which are stronglyriveted to the inner portions' of the upper ed ves of the scoop-members, the arms themse ves bein secured together by means of a pintle shaft toA form a hinge. The outer ends of the scoop-members B are supported from frame A by means of similar pairs of links b b', as shown, which links are pivotally attached at their upper ends to the centrally-disposed shaft c of the three shafts referred' to asV being mounted in such frame A, the lower ends of which are pivotally attached to cli s b2 riveted to ,the4 rear or closed ends of t e scoop-members B. Rivet'ed to the upper portion of cach of the two at one end of the bucket are plates a7 in which the ends of shaft a2-projecting through outermost plates a, are' journaled. The object of-these plates a7, is to prevent the rotation of frame about central shaft a', such as mi ht othersA wise occur. Of such two arms B2 the one B2 is considerably longer than the other, and by virtue of their pivotal connection they are obviously adapted to permit oscillation of the respective scoop-members B about their V ints of attachment to links b to open or close, as ma be desired.

In the longer arm pivotal shaft b, and the arlns outer or free end, is mounted a second shaft b4, parallel with suol shaft l), that bearsa trip member 3. The .ower portion of such trip member terminates in a foot b5, the upper ort-ion of such member being provided in e ect by a latch b that is likewise mounted on shaft b4 I and is adapted to enga e with a lug b1 on the inner face of one of tie bifurcated ends of sooo -arm B. Thedisposition of trip meniber 3 and such lug b1 is such as to permit the aforesaid engagement to take place only4 when scoop-members E are fully extended or o encd, Figs. Sand 6. When trip Inomberg3 is thus in engagement with lug b1",

2, about midway of'V y againstc osing, as will be evident.

an erases the s'stool -members are eectually locked ln this locking position of the trip member, its outer foot portion ol lies below a plane passing through the lowermost portions of the open scoop-members, as is shown in Fig. 3, above referred to. Mounted in the outer or free end of the lon er scoop-arm B2 upon a shaft b3 parallel willi the ivotal axis b ofsuch arm, and hence wit-iA trip-arin-shaft b4 asV well, are ,two pulls s or sheaves b". Such rsheaves are partie y incased in a protective housing 217, preferably formed inte ral with the terminal portion of the arm, t ie object of such housmg being to revent the entrance of the material being` andled inte the bearings of the sheaves, or between the sheaves and the cable hereinafter described as running around the same, when arm B2 is horizonte ,y disposed in the o ien position of the sooo -mernbers, 3. ustbelow the yairis 53o sheaves t", in the outer portion of arm B2, is another 'transversely-disposed I shaft bs, from whichis hung a transverselyignated by reference disposed sheave b, the casing of which is free 'to oscillate, as will be evident, about such shaft bs as an axis. Mounted upon shaft d, which. has already been. described as transversely-disposed in one end of the frame structure A, which l shall here for convenienee of future reference term the front end, is a pair of ulle s a5 disposed in pro er alincment Wit pu ey b the outer en of scoop-arm B2. Uponthe shaft c in the opposite, or rear, end of frame structure A is mounted a second pair ot smaller guidepulleys 'or sheaves a".

As has been indicated, the operation of my bucket is designed to be effected by means of a single rope or cable this cable being desletter C in the several figures of the drawings. Cable' C has its ends variously connected. eXteriorly of the bucket depending on the manner in which it is found preferable to operate the latter, ln the first it will be assumed that one suoli end is iixedly secured enteriorly of the mechanism constituting the ore bucket structure, as to the end of a derrick-boom, bridge traveler, or the like, depending on the character of the unloadinv plant. The other or free end of auch cab e is then designed to pass over a ulley in suehderrick end in the usual fas lion f tand l nce not illustrated), tov the drum of b, in the eXtreme outer end of such scooparm B2, 1n the order named. Both the free and dead-end portions are guided upwardly as they leave sheaves b by being passed behind the aforesaid guide-sheaves a in the rear end of frame A. The single cable C, by virtue of its external attachment and its disposition just described about the several sheaves mounted in scoop-arm B2, is obviously adapted., upon its free end being .drawn in, topelose scoop-members B, and

when said meinbers arev thus closed, to support and raise the bucket structure in its is conveniently attached release cable D.v

The lower ends of sidelates d are bifurcated, Figs. 2 and 3, an( are adapted, when hook dz hangs in its normal pendent position, to inclose therewith a vertical oblong space, the width of which is sufficient 'to accommodate readily transverse shaft a of frame structure A, from which are supported, as has been described, scoop-members B oi the bucket. Engagement of such shaft a of frame A with hook d2 is effected upon such shaft being raised against the lower curved face of the hook as it lies between the bifurcated ends .of side-plates d', the effect of the pressure of the shaft against the hook being to swing the latter rearwardly until the shaft has been raised above its lip. Thereupon the hook swings again into place, and upon now lowering the bucket, i. e. frame A and shaft a', such shaft, and thereby the rest of the bucket structure, will be held and sustained by the hook. The length of the oblong space formed between the upper face of the h ook` and the bifurcation .in the respective side-plates d', is designed to be just suflicient to permit the movement of shaft a described. ward direct-ion is prevented by means of a pin d3 extending' between plates d; this pin, at the same time, serves to hold the plates properly spaced. The transverse base member or cross-head from which hook d is pivotally hung is suspended by means of a cable d2 or the like 'from the saine derrick-bmmi, traveler', or equivalent structure, in which is secured the dead-end of operating cable C, as also the pulley over which passes the free end of the last-named cable. lnv other Words, the dead-end and free cud portions of cable C, along with cable D, lic parallel as shown, and, in order to prevent undue swaying of the operating cable portions, as also to prevent their chance disengagement from Swinging of hook d? in a for- A of 'greater or less length, as found best in l obvious an increased steadymg effect 1s features, since the de,adendl portion of cable i' ition with such semi-automatic means to i bers ofthe bucket appear in their closed posily loaded bucket is sustained by cable C, or, in

cable is not paid out at all until the derrick- 4provision of a tube d5 rigid with the portion of such cross-head through which passes the Vof the scoop-members on the pile, which,

l in the free end ortion of joint operating it has been closed.

the sheaves of the bucket structure, they* are preferably passedv through suitable apertures therefor provided in the lateral portions 'of the aforesaid cross-head d. This effect may be still further enhanced by the dead-end portion of cable C, such tube being actual service, by means of which it will be obtained without any objectionable wearing.

Cdoes not move relatively to the cross-head in the ordinary operation of the device. Su porting means D, in the form that has ,just een described, constitute what I term a semi-automaticreleasing device. In Figs 4 and 5 l illustrate releasing means adapted to be incorporated in the structure of bucket frame A and designed to operate in conjuncre'nder their action wholly automatic. Before taking up, however, the description of thelatter, it is deemed advisable to describe the operation of the bucket, since such operation 1s concerned in the operation of the automatic releasing mechanism., and vits understanding will facilitate a comprehension 'of the latter.

As shown in Figs. -1 and'2, the scoop-menrtion which they occupy only when filled. Inl other' words, the stage of the operation there shown is that just subsequent to the closing/I will be remembered, is effected by draw supporting cab e C. In s'aid Figs. 1 and 2, sue cable C is-represented in the performance of its second or supporting functlon only. By means of it, then, the bucket is raised until shaft c of frame A- is engaged and held by the hookd2 of exterior su port-ing means l). Theweight, however, o the closed and other Words, the free end portion of such" boom or. equivalent structure has been operated to swing or move thel bucket into the position where it is desired y to dump the same. Only then is cable C paid out. It will be understood of course, that in practice the swinging or other Lmovement of the bucket is usually effected simultaneously with the elevation of the latter sothat no time is lost in simply raising the bucket after The weight of the bucket structure is n'ow supported, as will be evident, by the hook d, and the paying out lof cable C permits the automatic depression of scoop-arm B2 and the opening of the scoopmembers, the final dumping position being shown in Fig. 3. incidentally tothe as- Afrom lug 61.

sumption bythe scoop-members of their the bucket, as will be understood, by the locking action ofA tri B3. Such locking ac-y tion continues until t e foot of the trip comes neath upon such-footbemg adapted, in the manner previously explained, to effect the oscillation of the trip suflicient to release it Consequently, upon cable C being now again drawn in, its first action will be to close the scoop-members, and only to raise them after such closure has been ef fected, this being the stage of operation with which the description began.

To .obviate the necessity of jerking, by`

means of releasing cable D', hook d2 out of engagement with shaft c of frame A, preliminarily to klowering the open bucket onto the pile, I havedevised the automatic release which I shall now describe. This deelongated opening e7 adapted to fit over shaft a2, whereby lts reciprocaticn is limited. Such ,reciprocable member E is further supported by means of two inwardly-curved arms e e pivotally hung from shaft a', and pivotally connected to such member E by a pin e. Arms e extend a short distance below this point of pivotal attachment to member E, and have secured between them a block or cross-head 'e2 throu rh which is slidably fitted the lower end 0 a rod e3 whose upper end is secured in a lug e" on the underside of member E. A helical expansion spring e5, or equivalent resilient member, is fitted over rod e3 between lug e4 and crosshead e2. ously be to'urge member E rearwardly into its lowermost position, that shown in dotted outline, Fig. 4. The lower end ofthe member is given a crescent or like concave fermation, and is of such a length as to be engaged by the shaft in the outer end of scoop-arm B2, whereon sheaves b" are nlounted, in the vstanding lug e, that is adapted in the inerativc position just described as being o e `ected by the closure ofthe bucket, .to rest The open bucket is now low- The tendency of spring e5 will obvi- `in'contact withthe pile, pressure from bepermit the bucket to be lowered.

against the lip of hook d2 when shaft a is engaged and held by said hook. When' shaft c is thus held and the weight of the bucket vstructure supported therefrom, it will be evident that the action of spring e5 will be ineflective'to dislodge the hook, in spite of the removal of shaft t3 out of en agement with the lower end of said member f. However, upon the bucket-structure, including shaft c, being slightly raised as before, the weight only of the hookinow being opposed to the action of spring e", the latter will promptly force member E rearwardly and thus swing such hook clear of shaft c and This action, it will be seen, is wholly automatic and does away with the necessity of jerking on release cable D', so that the latter ma be entirely dispensed with. Whether this astdescribed automatic release be employed or' not, it will be obvious that my improved type of bucket in itself is characterized by various structural and operative features that commend it for use Generally in loading and unloading` plants. t will of course be understood that, as has-been stated before, such bucket may be hung and o erated from a traveler or carriage, in a bri ge unloadingr plant just as successfully as from a boom where a derrick is em loyed.A By dead-ending the operating ca )le upon the boom or bridge, a double turn or more of the cable may be easily had between the bucket frame and the scoop-arm, and the closing of the bucket effected with a correspondinglower expenditure of power; while by utilizing the same operating cable to sup ort and raise the bucket, when closed, an( to lower the same after beinpT dumped, the operation oi' the bucket is much simplified without any increase in complexity in the bucket structure. j v

lt has been )reviously intimated that other methods ol exteriorly connecting the two ends of cable C, than the one above assumed, might be advantageously employed. Thus, where suilicient power is to be had, both endsmay be attachcdto the hoisting drum and simultaneously paid out or drawn in. Sheave b thereu )on becomes in' eil'ect an equalizer sheave, 'the two portions of the cable actingf substantially' independently. This method oll connecting up the cable will be frequently found desirable where it is sought to install my improved bucket in existing` plants; such attachment will be practically accomplished by simplysecuring thc'ends in uestion to a cross-bar into which` the reoular hoist block can be directly hooked, as will be readily apparent. .l look di, where this arrangement maintains, is then preferabi.)r connected with a pole und manually swung into place to engage the bucket shell, and similarly withdrawn, as at present.

iOther modes of applying the principle of @vases my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, pro# vided the means stated by any one of the following'claims or the equivalent of such stated means be employed. f

l therefore particularly point out and distinctly claim as my invention:N i

l. In mechanism of the class described, the combination of a frame; two scoop meinlbers pivotally connected at their inner ends;

links connecting the outer ends of said mem lbers with said frame and a cable having one end secured exteriorly of said mechanism .having one endxedly secured exteriorly of said mechanism and passing around said sheaves, said cable being adapted to support said frame and members and to .normally close the latter.

3. in mechanism of the class described, the combination of a frame two scoop members pivotally connected at their inner ends, one of said members bearing an arm; links connecting the outer ends of said scoop members with said frame; three sheaves mounted in the free end of said scoop arm; two sheaves mounted in said frame; and a cable looped around one of the sheavesin said arm, the respective portions of said cable passing over one of the sheaves in said frame and one of the remaining sheaves of said arm in the order named.

4. In mechanism of the class described, the combination of a frame; two scoop members pivotally connected at their inner ends, one of said members bearing an arm; links connectimy the outer ends of said scoop menibers with said frame; a pair of vertically disposed and one transversely disposed slieave mounted 1n the outer end of said scoop arm;

a pair of vertically disposed sheaves mounted v in said frame; and a cable looped around the transversely disposed sheave in said'arni," the respective portions of said cable passing over one of the sheaves in said frame and one of said pair of vertical sheaves in saidarm in the order named.

5. 1n mechanism of the class, described, the combination of a frame; two scoop inembers pivotally connected at their inner ends, one of said members bearing' an arm; links connecting the outer ends of said scoop inem-d bers with said frame; three sheaves mmmtcd in the outer end of said scoop arm; two

-sheaves mounted in said frame `and a dead bers with said frame, a pair of vertically disposed and one transversely disposed sheave mounted in the outer end of said scoop arm a pair of vertically disposed sheaves mounted in said frame; and a cable looped around the transversely disposed slieave.in said arm, one end of said cable being iixedly secured exterorly of the mechanism., and the free and dead end portions, respectively of said .cable passing from such loop over one of the 4sheaves 1n said frame and one of the remaining sheaves of said arm .in the order named.

7. In mechanism of the class described, the combination of a frame, two scoop members pivotally connected at their inner ends,

, one ofsaid members bearing an arm; links connecting the outer ends of said scoop members with said frame; three sheaves mounted in the outer` end of said scoop arm; two sheaves mounted in said frame; a cable looped'around one of the sheaves in said arm, the respecti1 e portions of said cable passing from such loop over one of the sheaves in .35

said frame and one of the remaining sheaves in the arm in the order named; and guide sheaves in said frame adapted to receive and guide such cable portions upwardly from such remaining arm sheaves.

8. In mechanism of the class described, the combination ofa frame; two scoop members; arms borne by the inner portions of said members, respectively, said arms being pivoted together; links connecting the outer ends of said scoop members with said frame; a'pair of sheaves vertically mounted in the outer end of one of said arms.; a third transversely disposed sheave mounted in such arm end and oscillatory aboutl an axis at right angles to its own axis; a pair of sheaves vertically mounted in said frame; a cable looped, around said transversely disposed sheave in such arm end, one end of said cable being iixedly secured exteriorly of the mech'- anism, and the free and dead end portions, respectively, of said cable passing from such loop over oneof the sheaves inA said frame and one of the vertical sheaves ln said arm in the order named; and guide sheaves in said frame adapted to receive and uide such cable portionsupwardly from suc vertlcal i arm sheaves.

9i In -mechanism ofl the class described, the combination of a frame comprislng side plates; a1 shaft mounted therein mtermedlatelyof. said framesends; two scoop members; arms borne by the inner portions of said scoop members, respectively, one of said arms being longer than the other and the one being pivoted to the other; ,links havin their upper ends mounted on the end of 'sai frame shaft and their lower ends pivotally at tached to the outer portions of said scoop members a pair of sheaves vertically mounted in the outer portion of said longer scooparm; a third transversely disposed sheave mounted said arm end and osclllatory about an axis at right angles to its own axis; apair of sheaves verticali mounted in one end ot said frame; a cab e looped around said transversely disposed sheave in such arm end, one end of said cable being fixedl secured exteriorly of the mechanism, an the free and dead end portions, respectively, of said cable passing from such loop over one of the sheaves in said frame and one of the vertical sheaves in said arm in the order named; and guide sheaves mounted in the otherl` end of said frame adapted to receive and guide such cable portions upwardly `from suc-h vertical arm sheaves.

10. In mechanism of the class described,`

the combination of a frame; scoop members supported therefrom and adapted normally to close; and means adapted to lock said members in their open position, such means being operable b pressure from beneath to release said mem ers.

l1. In mechanism of the class described, the combination of a frame; two scoop members pivotally connected at their inner ends; links connecting the outer ends of said members'with said frame; a cable connected with said frame and members to support the same and normally to close the latter; and

means'adapted to lock said members in their open position, such means being operable by pressurefrom beneath to release said members.

12. In. mechanism of the class described,

the combination ol a frame; two scoop members; arms borne by /the inner portions of said members, respect1vely, said arms being pivotally secured together; links con- I necting the outer ends of said members with said frame; sheaves in the outer end of one of said arms and in said frame; a cable passing around said sheaves and adapted to support said mechanism and normally to close said scoop members; and a trip member pivotally mounted in one of said scoop arms and adapted to lock said arms in the open position of said members, the free end of said trip member lying below the plane of the bottoms of said members when the latter are open and being operable by pressure from beneath to unlock said arms.

13. In mechanism of the class described,

the combination of a frame; two scoop of said members, respectively, said arms being pivoted. together; links connecting the outer ends of said scoop members with said frame; a pair of sheaves vertically mounted inthe outer end o1 one of said arms; a third transversely disposed sheave mounted in such arm end and oscillatory about an axis at right angles to its own axis; a pair of sheaves vertically mounted in said. frame; a cable looped around said transversely disposed sheave in such arm end, one end of said cable being iixedly secured exteriorly of the mechanism, and the free and dead end portions, respectively, of saidv cable passing from such. loop over one of the sheaves in said frame and one of' the vertical sheaves in said arm in the order named; guide sheaves in saidv frame adapted to receive and guide such cable portions upwardly from such vertical arm sheaves; and a trip member pivo tally. mounted in said longer scoop arm and adapted in the,I open position of said scoop members to lock with the other of said arms, the free end of said trip member lying below the plane of' the bottoms of said`memvbers when the latter' are open and being operable by pressure from beneath to unlock said arms.

14. The combination wlith exteriorsupportr ing means; of a frame adapted when raised to engage with and be held by said support-V ing means; scoop members supported from said frame and a cable connected to support said frame and members; and when thus supporting the same to tend to close the latter, said members tending to 'open when supported from said exterior supporting means. v

15. The combination with exterior supporting means; of a frame adapted. when raised to engage with and be held by said supporting means; two scoop members pivotally connected at their inner ends;

links connecting the outer endsv of said members with said frame; and a cable hav-y ing one end exteriorly lixedly secured and looped about said frame and members to support the same independently of said sup porting means, said cable tending to close said members when thus supported therefrom, and said members tending to open when supported from said exterior supporting means.

16. The combination with exterior porting means comprising side plates having their lower ends bifurcated, and a hook pivotally mounted between said side plates; of a-frame adapted u on being raised to be engaged between sai( hook and biurcated side plates; and scoop members supported from said frame.

17. The combination of exterior supporting means comprising side plates having their lower ends bil'urcated, and a hook pivsuperases a frame ad apted u on being raised to be e`ngaged between sai hoek and biurcated side plates; scoop members supported from said frame and a cable connectedto sup ort said frame and scoop members and w. en thus supporting lthe same to tend to close the lat ter, said memberstending to open when said' frame is supported from said hook.

18. The combination with exterior supporting means; of a frame ada ted when raised to `engage with and be he d bysaid supporting means; scoop members supported from said frame; a cable connected to sup*- port said frame and members, andwhen thus supporting the sami` ro tend to close the latter7 said members tending to open when said frame is supported from said exteriorsuporting means; and means adapted to re ease said irame from the latter.

19. The combination with exte'riorsupporting means; oi a frame ada ted when raised to engage with and be he d by said supporting means; scoop members supported from said frame; acable connected to support said frame and members; and ywhen thus supporting the same to tend to close the latter, said memberstending to open when said frame is supported froinsaid exterior ,sup-

porting means; and means adapted automat ically to release said frame from the latter.

20. The combination with exterior supportingA means; 'oi a frame adapted when raised to engage with and to be held by said supporting means; scoop members sup-v ported from said frame a cable connected to support said frame and members, and when thus supporting the same to ltend to close the latter7 said members tending to open when said frame is supported from said exterior supporting means, and means adapted automatically to release said frame from the latter when said members are open.

21. The combinationwith exterior supporting means comprising` side plates having their lower ends bifurcated, and a hook pivotally mountedbetween said side plates; oi a frame including` atransverse shaft, such shaft being adapted upon upward movement of said frame toA be engaged between. said hook and bifurcated side plates scoop members supported from said frame a cable-com nected to suiport said frame and scoop' members an when thus supporting the same to close the latter, said members tendingv to open when said frame is supported from said hook and means adapted to swing said hook out of engagement with said frame shaft.

22. The combination with exterior supporting means comprising side plates having their lower ends bi'lurcated, and a hook piv otally mounted between said side lates of a frame including a transverse s ia'lt, such v h shaitbeing adapted upon upwardmovement otally mounted between said side plates; ofi of said frame to be engaged between said hook and bifurcated side lates; scoo members supported from said ame a ca le-connected to sup `ort said frame and scoop members and w en thusgsupporting-the saine to close the latter, said-members tending to open when said frame is supported from saidV hook; andmeans adapted automatically. to'` swing said hook out of engagement with said frame shaft when said scoopmembers are 23. The combination with exterior supporting means com rising side lates having their lower` ends bi rcated, and a hook piv-` otally mounted between said sideplates; of a frame including a transverse shaft, 'such shaft being adapted upon upward movement of said frame to be engaged between said hook and bifurcated `side plates; scoolp e members supported from said frame; a cab connected to sup ort said frame 'and scoop members and W en ing to o envwhen said `frame is su from sai hook; and spring actua means mounted in said frame andtending to swing said hook out of engagement with said frame `shaft, the operation of said'means lbeingdqj#` lmem i p 24.. The combination with exterior sup` porting means'coniislrising side pendent upon the opening of said yscoop tending to open when said frame is .sup-- ported fromsaid hook; and spring actuated means mounted in said `frame and tending to swing said Vhook out of e agement with said frame shaft, the operation of said means being dependent' u on the opening of said scoop members-an the raising of said' shaft out of contact with said hook.

25. The combination with Vexterior supporting means com rising y side lates having their lower ends bigircated,` and frame including au transverse shaft, such shaft "being adapted u 'on upward move f t ment of said frame to c engaged between said frame and adapte thus supporting. the l same to close the latter, `saidmembers terldported `having o ne 'end exteriorl and passing around said s eaves, said cable4 95 scoop members and to normally close the A i contact with said hook. a hook `pir-l 'otally mounted between said plates, of a said hook and biurcated side pistes; two

scoop o rtions' of said scoop `members, such arms ing pivotally secured together and thel onebemg longer than the other links eon-J necting the outer ends of said scoops with said frame; sheaves mounted in the outer end of' said longer arm and in said frame; a cable having one end Imzteriorly ixedly secured and passing around said sheaves, said cablebeing adapted to support said frame' and scoop members and to normally close the latter; a member 'recigrocably mounted n1 to engage said hook members; arms borne by the `inner when said ram'e shaft is in engagement' therewith; and` a spring adapted to actuate said reciprocable member vto swing said hook out .of such` engagement, said longer scoop arm being ada ted when its in closed 'o sition to hol said reciprocable mem er against operation..

26'. The combination with exterior supporting means com rising side plates having their lower ends bi urcated, and a hook pivotally' mounted between said. plates; of a frame including a transverse shaft,v such shaft being` adapted upon upward moverr ent' of said frame to be engaged between said hook and bifurcated side plates; two scoop members; arms `boriie by the inner portions of said scoop members, such arms being, pivotall'l secured together and the one belng an the other; links connecting the .Onger outer ends of said scoop memberswith said `fra e; sheaves mounted in the outer endy of saiH longer arm and in saidY frame; a cable being adapted to support said frame and latter.; a member reci rocably mounted insaid frame and adapted to engage said hook when said frame shaft is in eng ement therewith; and a spring adapted to attuate .said reciprocable member to swing said .hook

out of such engagement, said longer scoop larm being adapted when in its closed E01 sition to hold said reci rocable mem er 105 against o eration and sai spring being effective on y when said shaft "1s raised out of :fixedly secured

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