US1056248A - Bucket. - Google Patents

Description

H. S. ATKINSON.

Patented Mar. '18, 1913.

4 SHEETS-SHEET 1.

@i l @l @i H. -S. ATKINSON.

BUCKET.

APPLICATION FILED mms, 1912.

4 SHEETS-SHEET :2.

ki. S. ATKINSON. BUCKET. .PPLIGATION FILED 1126.6, 1912.-

v1,056,248. Patented Mar.18,1913.

4 SHBETS-SHBT a.

wil/wwwa: j: E K

onirica.

- comrsurfolgunwtgonm NijLlY'..

'A RPon'A'rIoN oF NEW'YORK.'

'/'o allie/tom it'm'ay co'n'cemrfj. j y Be it known thatI HERBEarS. A'rltxNf' am, a citizen o'fgtheibitegstates, and@ resident of East' Orange in the county." of Essex and State of N ew ersey,"have`invent-} ed certain'newand useful Im roveinen'ts inA Buckets, of which th'e* 'following isjafull, clear, and exact specification, sueltas willl enable others skilled inthe art'to which it? appcrtains to make and usethe same. l

'lhis invention relatesto hoisting buckets,` and particularly that Aclass known as the clam shell. Y j 'lhe object. of m present invent-ion is'to provide a thoroug ly practical bucket,the opening and elosin mechanism of which is operated by electricity, through the medium of an electric motor'and associated mechanism'suspended from the bucket head. l am aware that others have .produced buckets, the opening and closing mechanism; of which has been So erated through one or more motors on the ucket,j'butso far as 1 am aware, all of such buckets haveexnbodiedf. the principle of positivelylgearing the bowl sections to the driving motor ormotors and they have not gone intogeneral use on ac'- count of numerous object-iomiblefeatures,l among which may be mentioned fthemense with which suchrgearinggtakes u 'gritt nuit-ter from the material4 `andled,rt ejten -g ency of which'is to interrupttheopration of the bucket, if not to destroy its 'working' pul'iS. I' l' )ne of the salient featuresof my electri-v cally operated bucket is that the: motor isl not positively geared to tlie`.bucket sections there being provided a flexible means'fo opening and closing the bucket sections',"th`e. gearn between themotor' and said tiexible means eing lso incased as'to eliminate praeically all possibility of the liarts eomingin contact with dirt, grit or. ot er hard mate-v rial to injure the same,-

Another object of my inv'e'ntion'is to ro-K` vide an electrically operated,bucket wiich` may be operated from a distantv point, with'- out the use, onthe bucket, of circuit breakers, or fuses toibe blown,.toj"'o`p en' tle elec-l.` trical circuit when the bowl .sectionsencourt#A ter an insurmountable",obstruetioiijto ltheir closing, the absence of whiclifeaturein' my' mei; rt. 'Patented Mar. 1s, 1913.

rriiest'iinfma nece' 'per' 6,1912. seran No. 735,183.

f' lbucket' makes'it a much more practical and operative apparatus than buckets otherwise constructed, since it is extremely important ithat'fthe 'z electrical circuit should not. be 4-ibroke'ti*wht'enever the maximum closing Ipow'erffofv thefmotor is reached. By the use ofiny apparatus, in lsuch event, the opera- Ition'of the motor is not interrupted. -further "object of my invention is to rovide means on this bucket, whereby the wl sections nre automatically brought to jrest when 4'they have reached the fully opened position, without the employment ot 'positive stops for that purpose on the bowl Esections, which stops, in this type of bucket, would be objectionable, as will be hereina'fter explained, and this operation is effected without the necessity of, at. the saine Ltime, stop ing the operation of the motor.

Other oljects, such as economy in con- @Struction and operation, as well as simplicity -of4 arts', will be readily apparent from the fol owingA description, in connection with lthe'accompanying drawings, in which, Figure 1 `is a'side elevation of a bucket lembodying my invention; Fig. 2 is an end elevation; Fig. 3 is a detail, broken away; Fig.l 4 .is a longitudinal.vertical section on line'l-A of Fig. l; Fig. 5 is a diagramnnitie illustration of the electric circuit and the. :use of the bucket in connection with an electli'coontroller and a novel form of take-up device interposed between the controller and lthe bucket; Figs. (l and 7 are detail vertical ,sections Online 6-6 of Fi Y. 4 from the rea r 1ofthe a paratus, shown in Fig. 4, and on 'lin '7- 0f Fi 8; Fig. Sis a detail elcgva'tion of parts s own Yin Figs. and 7.

'The 'specific form of take-up device. diammaticallv illustrated in Fig. 5, forms t e subject of a separate application, Serial N0. 744,088, filed by Herbert S. Atkinson andHerman J.V Brendlin, January 25, 191:5, the useofwhich device, however, it will he understood ,"may be dispensed with in situa tiens where there is no great rise and fall ol' "the bucket in itsoperation.

Referring tomtheA construction illustrated, and with vparticular'reference to Figs. l and `2,',A ,representi'if*the supporting head of the -buckefcomprising u botly portion A' from whichrprojectsupwardly a clevis A", and

tinted, comprises the to carry a'isupurereo ,eijaref-fpvota lylgmeantedxtherfaa which are, atjs the irlf'slower` ends, "pivot-4': ally connected t `the :outer edgesI .-'ofi'fa phi!v Each 'off'the bowl-, sections C', C is provided with a pairof side arms .D,D', E, E', which side arms, at theirl up r ends, are pivotall connected toga w1eigited member whic i. atits upper`-portion. is lon 'tudif nallybored to. receiver pin'F whic acts, not only to. hold tlie'side arms E', D, D', to the weighted member F, biit, alisoacts as a support. for the roller G. mounted lon. said weighted member F. The wei lited member F isl also. provided at each sidethereof, with a pair of upward projections Hl H', each pair of which carries rollers 1,11, to assist in kee in the wei hted member F in a substantia l orizonta position'.

The depending lugsA, A 'of the supportin head A are apertured to'4 receive, at each side of said supporting head, holding bolts J, J which 'bolts likewise pass through holding lugs K formed; integral. with a casing L, adapted to inclose and su port the bowl-operating mechanism to e now described. Said o erating mechanism is more clearly' illustrate in Figi 4, and may be referred to in general, as comprising, at the left hand end of the figure, a motor M, at the right hand` end thereof, the carin actuated by saidmotor indicated atl', and a windingand lifting member intermedia-te thereof, indicated; inwhole at v The motor M ma i beA of any wellknown type, the armature s aft of which, indicated at P, is coupled to and transmits motion to an operating shaft, P', which, in turn transmits` motion tothe winding and lifting member O through` a systemof planetary gearing indicated at N, which, as here illusinion Q'fast t'o the shaft P', through whic motionis transmitted to the planetary gears Q" Q?, meshing with the internal gear which gearsQ, Q through the pins Qt, transmit motion to the ear cage Q keye to which is the pinion 1 which,mesliing, with the planetary gears Q', Q traveling on the internal gear Q, transmits motion to the gear ca e Q, through the pins Q, Q. As will e seen, the winding and lifting, member O receives motion through the rota movement of the gear ca e Q, towhich it is secured by means of tie sleeve,Q, fast to, the ear rage Q and keyedtosaidmember O. at

lhe winding and liftin member IO comprises an inner annular bo y,.R andan outer annular body S, and. aan'gd and threadedv annular adjusting member, T.4 The inner body R carries, at its outer periphery, a sce feathered to said inner -outer body' S is rovided at its inner surface "witha Series o annular friction plates or disks S" .feathered to said outer body at S2. '.A t"oneside, 'the' inner surface of the outer "body Sis threaded, at S".

rality of-bowlfsections', indicated at C', C,

riesofannul'ar friction plates or disks Il.

)ody ut R2. The

Theadjusting member T is' annular in fomf-and is provided with a plurality of right angled flanges S, S, the latter of ich. is exterioily threaded to engage the threads Sof the outer body S, and the. former of which is bored, near its outer periphery as at S, S7 to receive and to bc a justed by,either tightened or loosened `a proper tool such as a s anner wrench.

Tliej'inner. ortion of said a justing member T is 'forme with an inwardly and upwardly proecting spring flange S2, which is annular in s iap e the inner face of which is adapted to bear against and press together the series of friction disks R', S'.

It will be observed that there is here provided, a winding and liftingy member, comprising two main parts, which, due to thc friction of the disks R', S', when pressure is exerted,- thereon by the adjusting member T, will rotate as one, but when the force opposing rotation, is suliicient therefor, only one of said parts will rotate, thatis to say, the inner member R.

A flexible connection is provided between the weighted member F and the outer body S of the winding and lifting member O` which, this instance, is shown as comprising a ro e T (but it is to be understood that. a c ain,` preferably one having a flat link, may be used as Well). The manner and form of the connection of the rope T with the outer body S of the winding and lifting member O, as well as the utility of thisA connection, when associated with the frictiondisks heretofore described, will reqiiire some little description.

Referring t0 Figs. (l, 7 und 8, L indicates the casing which part-ly encircles the windingand ifting member O which casing is shown in Athis figure with a oiton of the exterior broken away. It wi l be seen that on each side, and at the lower portion, of the Casin L, there is a bulge or offset indicated at F and 0n the inner surface there- 0f, a shoulder L* is formed, the urposc of which will be hereinafter referrer to.

The connection of the rope with the outer body S of the winding and liftingr member O will now be described. Adjacent the flange T, the outer surface of said body Sisformed with a curved recess or channel T, within which rests a curved link 'l", which at one end is pivotallv secured, by means 0f the screw 'l1 to un oil'sct. 'l" on the, flan e T', which otl'set is continued upwar lyto form a tongue '1"' to act as a dcflector or guide for the rope T. The oppolil fitr) site endvof` the link Tlis lpivotally secured It will be observed-that theru per end of the 1ink"T' is'fconsiderablysma ler than'the upper portion of the recess f'l"f(see`Fig.l 6)` so astopermit ofsome-play ofsaid in k,

the winding and liftin 'member-O, which body is, at this point, ormed lwith a small. recess Tn to permit said socket-to'lie close.

to the surface of the outer body S adjacent the flange T.

When the bucket is in closed position, the rope T will have one or-two passes around the outer bodyv S of the winding and liftin member O, thence the'rope asses from sai outer body S around the ro ler G, being secured at its farther or outer end to a relatively stationar part of the bucket, as indicated at T ce Fi 1 and 2).

With the parts in t e osition indicated in Fig. 6, the rope T may e unwound from the windin and lifting member O, in the direction o the arrow, 1n which action, the tension of the rope T will be such as to dra w the socket T1 toward the outer periphery of said body, and the tendency to occupy this position will continue as lon as there is a continuous wrap of the rope around said body, but when the last wrap hasibeen unwound, and the bucket has reached its fully opened position, as shown in dotted lines in Fig. 1, the ull of the rope T will act to draw the link T away from the periphery of the outer body, compelling the same to occup a osition as indicated in Fig. 7, in whic 1 position, the free end of the lin r T, on the further rotation of the outer -body S, will contact with the shoulder L on the casing L, the result of which will be to arrest the travel of said link, an'd,there with, arrest the rotary travelof the outer body S, without, however, arresting thereby the rotary travel of the inner body R of the winding and lifting member O or interru t ing its o eration vor the operation'of tiiie motor an the intermediate ar, this being permitted by reason of the s i friction device eonnectingthe inner b y R and the outer body S.

By this arran ement I avoid the use of stops on the bow sections such as are commonly employed in types of clam shell buckets otherwise operated, such for example, as illustrated in the drawing of the application for patent, Serial No.-081,197 filed March 2, 1912 by John H.- Haywar i and I-lerbertS. Atkinson. lWere I tofemploy a positive stopten the bowl sections, such as there illustrated, complications would-result,

due to the fact -thatif .the movement ofthe motor were not arrested at just the-r httimc, and it was permitted to run too ar,

considerable slack would result. in the rope T', with resultant tangling thereof which wouldcause -interruption and delay in the operation of the apparatus. By the empio)y` 'ment of this feature of the invention, l not only ldispense with positively acting stops on the bowl-sections, but I am not required to rely u oniany particular alertness on the art of t e operator in the opening of the iiowl sections, since if the operator holds the current on too long, the unwinding operation stops automatically and the rope is always in proper position und in no danger of tangling.

My invention involves the use in connection with the ap )aratus above described of one of the well mown forms of magnetic brake, one of which forms is illustrated in Fig. 4, comprising a series of friction disks U rotatably mounted in the casing L and carried by' the shaft P', and a series of friction disks U', non-rotatably mounted in said casing and secured thereto, said disks being adapted to be compressed by the annular face plates Uz of the magnet arniature Ui.y normally held under ressure against. said disks by the spring lli, and released from such ressure by means of the electromagnet No invention is claimed herein in the above mentioned brake per .se-as it. is a well -known form of brake in general commercial use--but only in so far as it forms a necessary part of the combination ot' elements. I do claim, however, as essentially novel, the windin and lifting member hereinbefore describe both separately and in combination with the respective elements whose4 functions and use it affects and modifies.

The wiring circuit of the apparatus above described is illustrated diagrammatically in Fig. 5, wherein M indicates the motor cud of the actuating mechanism, U the magnetio brake and W the take-up device hercinbefore referred to for automatically tak in up slack in the wires when the bucket is oisted and for paying out the same when the bucket is lowered. W indicates an electrical controller for closing and opening an electrical circuit, comprising the line wire W leading to the controller, W a wire leading from the controller, thence to the take-up device W, thence to a terminal plugr indicated at W, thence through a terminal Y I board indicated at W, thence through the field of the motor M, thence through the electromagnet U, thence through the terminal board W, plug W, the take-up device'W thence t0 the generator; the conductor passes from the controller W to and-through the take-np device, thence through lthe terminal plug und terminal board mentioned, to the armature windingr of the motor, thence back to the terminal lfill board, lug, and'takefu-p'devicetpithelconf operating topress. theT magnet armature U i back against the-action ofthe'springfU to release the friction plates .U, Uf, and actuating the motor M, and itsassociated gearing, in one direction, thereby rotating the winding and lifting member 0,to raise the weighted member F, and bringing said member and the head of the bucket toward each other to close the bowl sections C' C. As soon as the bowl sections have been closed, the electrical circuit is opened by the operator by means of the controller W', thus at the same moment denergizing the magnet U and releasing the spring pressure of the armature U and com ressin the friction plates U, U', to holdf t e bow sections in closed position. It will be understood that the windin and liftin member O will be preliminariy adjusted y means of the tightening member'T sothatthefriction disks R', S will resist all desired and' proper amount of rotative force tof be o posed thereto, and this adjustment may e made in view of the character of material to be handled or to4 suit'special-conditions in the nature of the operation. In case the bucket is handlin a soft moldingsand in a foundry, there will be less likelihood of an insurmountable obstruction being o posed to the closin of the bowl sections, ut in case the bue et is used `for unloading-va:

mass of large sized c l, the bucketwould frequently encounte in its loadingI o eration, masses of coal upon which it wou debe impossible to. close its jaws, andI unless the motor were instantly relieved, it would interrupt the operation of the same, if not seriously inure or destroy1 it. In the.-opera tion of my ucket, in suc a case, the relief of the mot'or is automatic, the adiustin member T'being in advance, setto im ar the required degree of frictontn -the- "ction disks RQS of the winding andliftin ,member O, for all' ordinary work require of the bucket and its motor, and, in the conf tingency just referredr to, should lthe maxi mum power of thefmotor beovercome'by the-force -op osed' thereto,the innerbod R of the' win ing and'liftng member O` wi l' continuato be rotatedfb the motor M, -with no 4lifftin H'efectj-upoxift ei outer-body; S-'fof' said mem er, itbeing'simply'l necessary'then to slightly raise the bucket, whereupon the j lentire apparatus as follows Assuming.;4 that l' the i bucket-'f is ready for its load,."andf--the--bowl sections,

thereby energizing` the coils of the? magnet .U",.the armature of which magnet-fis thereby drawn` `ciently -ino `'resistance- -being lessened, the bucket will .clo'seQ-It will bel observed that this fricgtionalengagement of two bodies normally .movingasone is applied at a point where the'rotating member is comparatively slow lin itSfmQvement, :the point of, application being. of great importance, since 1t is obviousithat-to apply a slip friction device upona rapidly. moving part, as for example,

themotor shaft, -which is traveling at the rate'of say onevthousand revolutions per ,minute, would be utterly inoperative in an apparatus of this character, while to apply it to a slowly moving part, as for example, the winding and lifting member, traveling atsay eight revolutions er minute, is entirely practicable. Thus it will be seen that all of the operating parts of the bucketrespond instantly to the action of the operator, and are, at all times, under his immediate control, without involving the employment of such objectionable features as circuit breakers, or the blowing of fuses, and the like, to avoid injury to the motor in such emergencies as that above stated, the employment of which features, as I have hereinabove indicated, would be a source of interru tion and delay in the operation of the buc et.-

Then the bucket has taken its load, and isready for the o ening movement and depositin Said loa the operator closes the circuitliy moving the cont-roller to the reverse osition, energizing the magnet coil U, re easing the brake, and operating the motor in the reverse direction, thereby actuating the gearing and the winding and lifting member O inthe reverse ordier, to unwlndf'the flexible means T and lower the weighted member F and open the bowl sections which, when they have opened sulllare held in that position by opening the circuit, and thus permitting) the automatic actuation ofthe magnetic rake.

I have( already pointed out that on the. opening movement of the bucket, if the op erator does not open the circuit to stop the motor at just the pro er time, the unwinding operation ceases, ue to the positive stop on the casing L, the motor, however, being free to rotate. The same may be said of the o eration of the bucket and its motor in c osing, the motor being free to rotate after the bucket is fully closed, or at any intermediate stage between open and closed posi- `tion in case an excessive obstruction is op.

posed to the'closing movement.

It will be evident that I have provided au electrically operated bucket, the operating parts-of which are so flexible in their connections and so constantly under the iinmediate control of the operator that it can beopened and closed, and held and locked n or closed position, or in any intermediate stage of the open or closed position` lili-i liu tlO

to such a fractionall nicetythat the tzperationl ing and parts, as in the .case 'of electricallyoperated buckets heretofore constructed.: 1 I desire it-to be understood thatl do no limit myself to the-'precise detailsofy construction and arrangement of the invention herein set forth, as modifications and variationsmay be madewithout de artin from the spirit of the invention as efined. y the appended claims.:

Vhut I claim is:A

1. In a bucket, the combination ofja supporting head, links pivotally connected to lsaid head, u plurality of bowl sections pivotallv connected to said links, a weighted member having pivotal connection with said bowl sections. a winding and lifting member supported by said head,.flexible`means connected to said windin and lifting member and to said weighte member whereby the latter is raised and lowered, an4 electric motor gearing connected to said motor and to said winding and lifting member to actuate the latter at a slower speed than that of Isaid motor and frictional means interposed between said gearing and said flexible means whereby a predetermined load only may be carried by said winding and lifting member.

2. In a bucket, the combination of a supporting head, links pivotally connected to said head, a plurality of bowl sections ivotall connected to said links, a weig ited mem er havin pivotal connection with said bowl sections, a winding and lifting member supported by said ead, flexible means connected to said winding and lifting member and to said weighted member whereby the latter is raised and lowered, an electric motor, caring connected to -said motor and to sai winding and lifting niember to actuate the latter at a slower speed than that of said motor, frictional means interposed between 'said gearing and said flexible means whereby a predetermined load only may be carried by said winding and lifting member and means for varying the friction exerted by said frictional means.

3. In a bucket, the combination of a supporting head, a windin and lifting member supported by saidr hea Aan electrlcmotor gearing connecting said motor and said winding and ,lifting member, a plurality of bowl sections, links pivotally connected-to said head `and to said bowl sections,- a welg ted member pivotallyconnected to said bow sections, flexible means connected to said winding and liftin member and to said weighted member to li and 'lower the latter and thereby vclose and open the bowl secthe operator, it 'completely avoids vtions and a bra-ke member for holding the bowl sections in any desired open or closed position.

. 4. In a bucket, the combination of a supporting head, a winding and lifting member lsupported by said head, an electric motor,

earlng connecting; said motor and said windlmg and lifting member, a plurality of bowl sections, links pivotally connected to said headand-to said bowl sections, a weighted member pivotally connected to said howl sections, flexible means connected to said windingand lifting member and to said weighted member and coperating therewith to close and open the bowl sections, means whereby the winding and lifting operation of said winding andrlifting member may be interrupted without interrupting the operation ofsaid motor, and a brake member for holding the bowl sections in any desired open or closed position.

5. In a bucket, the combination of a suporting head, a winding and lifting memer supported by said head, an electric motor, earing connecting said motor and said winfn and lifting member, a plurality of bow sections, links ivotally connected to said head and to said bowl sections. a wei hted member ivotally connected to sai bowl sections, exible means connected to said winding and lifting member and to said weighted member and coperating therewith to close and open the bowl scctions, means whereby the winding and lifting operation of sald winding and lifting member may be interrupted without interrupting the o eration of said motor, and un automatic bra te member in circuit with said motor for holdin the bowl sections in any desired open or c osed position.

6. In a bucket, the combination of a supporting head, a winding and lifting member supported by said head, an electric motor. gearing connecting said motor and said winding and lifting member, a plurality of bowl sections, .links pivotally connected to said head `and to said bowl sections, u wei hted member pivotally connected to said bow sections, flexible means connected to said winding and lifting member und to said weighted member and coperating therewith to close and open the bowl sections, means whereby the winding and lifting operation of said winding and lifting member may be interru ted without interrupting the operation o said motor, and u brake member, electro-magnetically controlled, in circuit with said motor, for automatically holding the bowl sections in any desired open or closed position when the circuitis opened.

7. In a bucket, the combination of a supporting head` a plurality of bowl sections. inks pivotally connecting said head and said bowl sections, a weigited member pivlilo ot all i connectedtoisaidif "-btiwlfV sections, f win ing `and `lift-ing?-nieir'ibe'r supported by said head,- reducing gear connectedthereto` for o eratiiig'thefsamey':in-electric motorl on said head-:forf-actiiatin ,.saidf ar,'=fie`xiv ble iiieau'sfco ratin with-:sai ineiiiberhnd'wvit-hfsa'i winding and--fliftin member l tof-'raiseI 4and 'l lower said i weighte. member and thereby close iind'openthe bowl sect ions, frictional "means having operative connection @with said: reducing4 gear `and, with sa id winding and A`:lifting4 "member" for limiting the ,load carried by said lastf'namedmember andalbtake member-for'holdin bowl sections fin"v any. desiredopen' or 'c osed liosition. '-"''i' j" 'i 8. In a"bucket,-thecoiiibination of a supporting head, a' plurality of bowl sections links pivotallyconii'ectin saidv head an `said howl sections, a wei ted member pivotallv connected to sai bowl sections, a winding and lifting member supported by said head` reducing gear connected thereto for o erating the same, an electric motor on said iiiead for actuating said gear, flexible means cooperating with said wei -lited meinlier and with said windiii and lifting member to raise and lower sai weighted member and thereby close and open the bowl sections, frictional means having operative connection`with said reducing gear and with said winding and lifting member for limit-A ing the load carried bv said last namedA member and an automatic brake member in.

circuit with said motor for-holding't-he bowl sections in any desired open-or closed position..

iorting head, a plurality-of bowl sections inks pivotally connecting said head and said bowl sections, a wei ited member pivot'iillv connected to sai .bowl sections, a'

winding and lifting member supported by said head,.reduc1ng gear connected thereto for operating the same, an-electricmotor on said head for lactuating -said (gear, tiexible means coperatin with sai weighted member' and with sai winding and liftin member to raise-andiower said weghte member and thereby close and open the bowl l .sections` frictional means having operative connection with said reducing ear and `with said windin and lifting mem r for limiting the loa carried vby said last named member, and a brake member, electromagnetically controlled in circuit with said motor, for automatically holding the bowl sections in any desiredlopen or closed position when the circuit is o ned.

10. In a hucket,'@th'e combination of a supporting head, links pivotally. connectedv to said head, -a'aliia'lity of vbowl sections pivotally vconiiec to saidlinks side arms' on said bowl sections, a weighte -member ivotally connected to said side arms, a win ing wei hted'v g j Aber'for actuatin the l iandiflifting'member supported by said head, `jiiexible means connecting sind last named A'members to raise and lower said weighted -member and close and open the bowl scct-ion's',`speed reducing mechanism operatively connected to said winding and lifting memthe latter, an elect-ric motor on vsaid heat for actuating said mechanism,"and a slip friction device driven by said'reducin mechanism and acting on said 7 windin an lifting member to limit the loads-Ep aced on said winding and lifting member.

11. Ina bucket, the combination of a supporting head, links pivotiilly connected to saidhead, a plurality of howl sections pivotally connected to said links, side. arms on said bowl sections, a weighted member pivotally connected to said side iii-ms, a Winding and lifting member supported by gi: said head ticxible means connecting said last named members to raise and lower said Wei hted nieiiibe"'aiid close. und ope-n the bow sections, speed reducing mechanism o ierative'ly connected to said winding and liiiting member for actuating the latter, an electric motor on said head for actuating said mechanism, a slip friction device driven by said redticin mechanism and acting on said windin an( lifting member to limit the load paced on said winding and liftingr member and means for varying the degree of friction exerted by said friction de-vitx..

12. In a bucket` the con'ibination of a supporting head, a plurality of bowl sections pivota ly'connectcd to said head, an electritl Cil motor on said head, a. .friction-held winding 9. In a bucket, the combination of a suprl and lifting member actuated by said motor to operi and close the, bowl sections und a stop for said member to interrupt the operati movement of the bowl sections without interrupting the operation of said motor.

18. In a` ticket, the combination of a supporting head, a plurality of bowl sections pivote ly connected to said head, an electric motor on said head, a friction-held winding aLnd liting member actua-ted bv said motor having flexible connection with the bowl sections to open and close the latter and a stop for said member for autoinatieall)v interrupting the oiening movement of the bowl sections wit iout interrupting the operation of said motor.

14. In a bucket, the combination of a supporting head, a pluralityy of howl sectionsl pivotally connected to said head, a weighted member pivotally connected to said bowl sections, an electric motor on said head, a friction-'held Winding and lifting iiieiiibei actuated by Said motoi, flexible means con` noot-ing said winding and lifting member and said weighted member, and means for lntel'l'tlptl'ng te Winding and lifting operation of said winding and lifting member and thereby interrupting the Operating iiiovc- 11i ments of the' bowl sect/ions: iwithout, how-,f ever, interruptinfrff-"the operation f of 'said motor.

15. In 'a' buck tat-,the combination .of a' supporting` head, Vplurality of? bowl Asections v said winding-,and lifting memberl compris-- ing-a part positively geared to said mechanism, a part having flexible connection with said bowl sections, and friction means on said partswhereby they normally rotate in unison. 7

16. In a bucket,l lthe combination of a sup sorting head,l a plurality of bowl sections having pivotal connection with said head, an electric motor on'said head, a composite winding andl liftin member havin operative connection wit said bowl sect-ions and with said niotor,frietional means on portions of said member whereby said member is normally actuatedin whole by said motor to open and close the bowl sections, and a stop for said member whereby the movenient of the bowl sections is interrupted without interrupting the operation of the motor.v

17. In a bucketthe combination of a supporting head. a p -ii-rality of bowl sections, a plurality of links pivotally connecting said head and said bowl sections a composite friction-held winding an'd lifting member, an electric motor on said head, mechanism connected thereto and to said winding and lifting member for driving'the latter, ilexible means connected to said winding and lifting member and to said bowl sections to open and close said sections a stop on a relatively stationary part of said bucket, and a sto i on said flexible means, whereby the rotation of one part of said winding and lifting member may be`interrupted without interrupting the operation of said motor.

18. In a bucket, the combination of a supporting head, a plurality of bowl sections su ported thereby, an electric motor, speedret ucing mechanism connected lto said motor, and friction-held means actuated by said reducin mechanism, having flexible connection with said bowl sections for operating the latter.

1t). In a bucket, the combina-tion of,a supporting head, a plurality` of bowl sections supported thereby, an electric motor, speedreducing mechanism connected to said motor, friction-held means actuated by said reducing mechanism having flexible connection with said bowl sections,` for ,operating the latter, and means for va ing the friction holding said friction-helimeans.

Q0. In a ucket, the combination of a supporting head, a plurality of bowl sections up' ported thereby, anveleetric motor, speeducinv ymechanism connected to said mot-Kor, friction-held means actuated b v said 'reducing mechanism having operative connection with said bowl sections, for operat- .iiigtbe latter, said means including a series `of"`fr1ction members osit'ively driven by said reducing mechanism and a series of friction members frictionally driven b v the first named members.

Q1. Iii a bucket, the combination of a supporting head. a pluralityl ot' bowl sections supported thereby, an electric motor. Speed-reducing mechanism connected to said motor, friction held means actuated b v `said reducing mechanism having operative connectit'ili' with said bowl sections, for operating the latter, said means including a series of friction members positively driven by lSaid reducing mechanism and a series otfriction members frictionally driven by the first named members, and meansl for inci'eusin or decreasing the friction between said friction members.

22. In a bucket, the combination ot a supporting head, a plurality of bowl sections supported thereby, an electric motor, speed-rediicing mechanism connected to said motor, friction-lield means actuated by said reducing mechanism having operative connection with said'bowl sections, for operating the latter, said means including a series of friction ineinbei's positively driven by said reducing mechanism and a second series of friction members, adapted to contact with they first named members, and means for holding said friction members in frictional contact.

23.- In a bucket, the combination of a in adjustable member for holding said friction members in frictional contact.

24. In a bucket, the combination of a suporting head, a winding and lifting nicmerf lsupported by said head, an electric motor, speed reducinr gear connecting said motor and said winding and lifting meinber, a plurality of bowl sections, links pivot.- ally connected `to said head and to said bowl sections, a wei rhted member pivotally connected to said owl sections, flexible means connected to said winding and lifting member and to said weighted member and co cratiiig therewith to close and open the bow sections, and frictional means conporting head interrupting thegoperaticnfof said motor.

In a .bucket-,f.--the.'fcombinationgof.. asup-- porting head Aa' pliiralitygjofsbowl-.sections links pivotal yflconn'ectin .:fsaidQheadj-an said bowl sections,:a wei" Ated' .I'nemberpivotally connectedftousai jf-ljbowlgsections, a winding and lifting .'-member 'supported by said head, speed' reducingf.gear 'connected thereto for o erat-in the-same, an'.A electric motor on sai head; or actuating said gear flexible means co rating. g with sai weighted member anld. with saidf'windin and lifting member to raise andlower sai weighted member and .thereby close and open thebowl sections, and frictional means having operative connection with, v and driven by, said reducin ear and connected io said windin and iting member for limiting the loa carried by said last named member.

26. In a bucket, the combination of a supa plurality of bowl sections links pivotal y connectin said head. an said bowl sections, a wei ted member piv otallv lconnected to sai bowl sections, a winding and lifting member supported by said head, speed reducing gear connected thereto for o eratin the same, an electric motor on sai head or actuating said gear flexible means co erating with sai weighted member an with said windin and lifting member to raise and lower said amber" and drivenA byffsaid'5jspeedfireducing gear' j whereby l'the windingfand lifting operation of said member--maybeinterrupted:withoutl fweighted member and thereby close and pen the bowl sections, frictional means having operative connection with, and

'drivenby, said reducing gear and connected tofsaidA winding and lifting member for said last named and varyfi'ictional means;

2i'. In a bucket., the combination of a suport-ing head, a plurality of bowl sections iiaving pivotal connection with said head, an electric motor, speed reducing gear driven t-hereb a winding and lift-ing inember-sup orte by said head and actuated by said re ucing gear and having flexible connect-ion with said bowl sections to open and close the latter and vfriction means acting on said member driven by said reducingr .e

ear for interrupting its operation without interrupting the operation of said motor.

28. In a bucket, the combination of a supportingl head, a plurality of bowl sections pivota y connected to said head, an electric motor on said head, speed reducing fear actuated thereby, a friction-held wint ing and liftin .member actuated by said ear and flexib y connected to said bowl sections to open and close the latter, and means for increasing or decreasinor the friction holding said winding and lting member.

HERBERT S, ATKINSON.

Witnesses LAURA E. SMITH, EUGENE S. MACDONALD.

Copies ot this patent may be obtained tot ave cents each, by addressing the commissioner of Patents. Washington. C.

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