Патент USA US2406889код для вставки
Sept.,3, 1946.> ì V G. A; MITCHELL 2,406,889 POWER UNIT FOR TRÃVELING CRANES ’ Filed nec. 14; 1942 |wm ' Patented Sept. 3, 1946 2,406,889 UNITED STATES PATENT OFFICE 2,4o`sfss9 ` POWER UNrr Fon TRAVELING cRANEs George A. Mitchell, Muskegon, Mich., assignor to Manning, Maxwell & Moore, Inc., Muskegon, Mich., a corporation of New Jersey Application December 14, 1942, Serial No. 469,017 8 Claims. (Cl. 10S-163) 1 The invention relates to driving mechanism for traveling bridge cranes or the like and more par ticularly to a power unit adapted for converting existing manually driven cranes for power oper ation. One object of the invention is to provide novel means for mounting the power unit to the crane Z tive trucks. Rotation is imparted to the drive shaft by means -of an endless chain running over a chain pocket wheel I4 ñxed on the shaft. The chain, of course, depends belows the crane struc ture to permit convenient hand manipulation by an operator standing on the floor. The power unit comprising the present inven structure so that the shock and‘jar incident to tion is particularly adapted for converting man the starting of the motor is effectually absorbed ually driven traveling bridge cranes of the type thus insuring smooth, shockless acceleration of 10 above discussed for power operation. In its the crane. ` preferred form, the unit comprises a rigid frame Another object is to provide a power unit for structure adapted to be suspended from the trav traveling bridge cranes and the like which is erse drive shaft II and having driving means simple and compact in construction, inexpensive such as a chain pocket sheave 2| drivingly con to manufacture, and which can be easily and con 15 nected as by a chain 22 with the hand chain wheel veniently installed in existing hand operated I4 on the traverse shaft. A reversible motor M cranes to convert them for poweroperation. comprising an element of the unit isarranged to` Other objects ’and advantages l of 4the inven drive the sheave 2I in any suitable manner.` ' tion will become apparent from the following de The motor` M‘and other elements of the unit tailed description of the 'preferred embodiment are supported in a compact assembly on the illustrated in the accompanying ‘drawing’ in frame which is constructed to provide suitable which: housings for the moving partsand for the elec Figure 1 is a perspective view of a traveling4 trical equipment associated with `the motor. As bridge crane equipped with a power unit embody-A herein shown a gear housing 24 is formed by a ing the features of the invention. 25 vertical frame member 25 (Figs. 2 and 3) of Fig. 2 is a fragmentary end‘elevational vie generally oval contour having an integral ñange of the power unit. " ` Fig. 3'is a vertical sectional vie'w of the unit 26 extending around one side to define a rela tively shallow vertically disposed gear compart taken substantially on the line 3----3 of Fig. 2. ment 21. This compartment is adapted to be Referring to the drawing, the invention has 304 closed by acover 28 bolted or otherwise rigidly been shown for purposes of illustration as ap secured to the ñanged member. plied to a traveling bridge crane having a bridge Projecting laterally from the frame member member in the form of an I-beam 5 supported 25 on the side opposite the flange 26 and prefer at opposite ends by end trucks 6. Each end ably substantially at right angles to the plane truck comprises an elongated frame 1 disposed of the member is a rigid horizontal frame mem transversely of the bridge member and clamped ber or arm 2S terminating at its outer end in or otherwise rigidly attached to the bottom flange a box~like housing structure 30. A control relay thereof. Flanged Wheels 8 and 9 journaled on :Ror other control mechanism for. governing the trucks on opposite sides of the bridge member operation of the motor M may be mounted in the support the crane assembly on an overhead track 40 housing 30. It will be understood, of course, that formed by conventional rails IIJ. . ` 'the'control of the motor is effected through the Cranes of the above general character, as well medium of a pendant switch (not shown) or other as other types of cranes, hoists and various mate manuallyoperable circuit controlling device con rial handling devices, are commonly equipped veniently accessible to the operator of the crane, with manually operable means for'traversing the 45 . such manual device acting through the medium crane structure or device on thesupporting track. ` of the relay R to open and close the current In the exemplary bridge crane, this means com supply circuit for the motor. prises a horizontally disposed traverse drive shaft As will `be seen by reference to- Fig.Y 3 of the I I extending generally parallel to the bridge mem drawing, the housing 36 is formed with an end ber 5 and journaled at opposite ends on the 50, wall portion 3|.substantial1y para1le1 to the frame trucks 6. The shaft is drivingly connected with "member 25 and spaced therefrom to provide clear one wheel of each truck, as for example, the ance for the sheave 2|.V A boss 32 integral with wheel 8, by means of pinions I2 fast on the the wall portion 3l is recessed to receive a bear shaft and arranged to meshwith gears I3 rigid ing 33 in which is journaled one end of a shaft with the corresponding wheels 8¿of therespec ¿34 adapted to support the sheave 2| and to which 3 4 the sheave is keyed. The other end of the shaft 34 is arranged to project into the housing 24 ated with the yoke and the other with the cap member. The parts can thus be separated for convenient application to the traverse drive shaft through an aperture in a boss 35 on the mem Without requiring any dismantling of the crane ber 25 and is supported therein by a suitable bearing 3%. The housing 38 is dimensioned so 5 structure. In order to make the unit universally applicable that its top wall lies substantially in the same to the different sizes and types of cranes and plane as the top of the housing 24 While its bot comparable chain drivenl devices,v the hangers 50 tom Wall is located in a plane approximately and their bearing members 53 are separably as through the center of the housing 24. Space is thus provided below the housing 30 for the 10, sembled. More particularly, the half bushings forming the bearing members are loosely mount motor M Which is preferably mounted directly ed,in.the„recesses in yoke and cap member and on the fra-me member 25 with its .shaft ,MLproject-v ing into the housing 24. Suitable’packingisiprof are adapted toberetained in place after as semblyby fiangesv53’ on the ends of the bush vided around the motor shaftandïthe shaft134`l: to prevent leakage of oil or other lubricant around 115,A ings., Inpracticaan assortment of interchange able bearing members, all having the same out these parts. sidedimensionsI but varying in their internal The means for drivingly connecting- the-moton» dimensions to cooperate with shafts of different M with the sheave carrying shaft 34 is. enclosed in the housing 24. diameters will be kept in stock so that a bearing This means as herein shown comprises speed reduction gearing ywhich may be designed».` to give> any desiredrotative spreed‘to' 20 of the proper size may be selected for any* par theusheave 2|. The gearing as herein- shown in cludes av pinion 4l keyed tto the motor shaftî 4û~ ticularv installation'-` The chain 22 running‘over the sheave^2llandí hand > chain wheel ‘ l kprovides; a` driving,A connec: and- arranged toA drivey an idler gear 4l2’carriedf tion whereby the torque of motor M may be transf ona shaft ßlß'journaled'at'oppositeends-on the 25 mitted to the shaft Il.v With the ,unit thus sup ported on the traverse-drive. shaft, the torque ap frame member zäi'andgthe cover-_ 28:“ Idler gear plied‘to the Wheel I4 Will'tendjto Vswing the .unit Erin-turn4 drives a gear M'keyed tothe inner around the shaft. Due to the mounting, of _the end ofthe shaft» Bâtonrwhich the` sheave 2l"is_ motor MJ and other heavy parts of theunit a; mounted; Thel vertical " arrangement of. thje ì housing-`Á 2i" 30' substantial distance below the axis of the shaft), the Weight of the unit isvdistributedlin a manner together ,with its shape conformingy Y generally to _ such as to oppose suchrotation.„ the progressively’ increasing diameters of` the Means is alsoprovided 'for yieldably,resisting> pinions „and `gears of >the reduction, gear> traingis Y and'the’motor Mjat onerside of tlírehousingiM~- bodilyrotation ofî‘the unitïrelative to.tli'e„sup¢_. porting shaft an'dgfor absorbingïthesh‘ock and,”~ jar incident to; the„starting,_„ofr_the.motort so.as„ to insure smooth; 4shackles.; acceleration Aof,.-the andorre; above the__other,_ providesra, @very com pact'well' Ñbalanced -`structure whichv can _be `sup ployed‘for this purpose, asherein. shownicom- » portedin suspended ‘relatio'ngfrom then drive shaft’ prises a rigidban ôûliavingopposite endfportions.vv II^Without,'interferingqwith’the normal ’Yus?emof ~ oiîset with respect to each other but substantially the crane` andrwithout, imposing excessive strain parallel. Onevrendof, the bar iss/,secured :toaster advantageous inV reducing> both“ theVV sizel and,` weight of-'the- frameçstructure toga _minimurm Moreevelî; _the z arranaementnffthe, housing 30' on the shaft. Any, suitable means` may*< be_utilized"for,sup-Y porting the unitjon theÄ shaftdl in _a manner, sueh~ thatthev shafts-‘is free> tojvturnnrelative Ato` the unit; As herein shown, the ~supporting _means comprisesfa pair of hangers 53“ anchored to the'> frame andyspaced apartv so» as to straddle: thel ' handrhain Wheel I e as -shovvnrin Fig; 3: Each~ f hanger preferably comprises-a yoke`5l havinga cap »member '52 A'detachably secured to; its " ,upper endi- The«yoke and -cap -memberare _formed With4 complementary recesses _adapted «to ' hold À‘a’ gen-_ crane or device isolbernoveœ.v The.,means„e1n-- tionary .part <of , _thecrane structure, as ¿fora- ex- . ample, the bridgememberz. or-rI-beamß: vv-hileathay other end is yieldably‘ranchored,tothe framefoftth‘e unit. Due to the offset relation .ofethesend- por-‘f tions, the bar , mayl ,bel freadilyï.adjusted.rV for ¿use with beams;y orwgirderst oi .various @depths-byyturna' ingy it ,through an „, angle sufficient;r to -zprovideithe necessaryfvertical ,- spacing,;betWeen--fthefend rpolînf tions,.„ While:- anygsuitabletmeans mayzbeiutilízeaifom securing v_the bar in -`place,»\it_-_ís preferable .tovclamppy erally?cylinclrical bearingmember 5-3 *dimensionedj' 55 the-.parto the,bridgelmemberfsd‘asetdavoiddrills» íneeor- Otherfmachíne, nperationsfongthelmembery: for -a rotating ?it- »with Atheeshafi'fl I .' The -yokesV El of the hangers are‘secured ,to the frame-by» hangerl rods-54j threaded into bosses formedrespectively in the top~vvalls of Ithe‘h‘ous ings -ZlthandßD-Lof» the frame. To‘- enable the unit to be properly positioned for/use Withhand chain Wheels of different diameters, the~yokesv ared aruerturedtol slidably receivetherods and 'the latterareclampedin place by nuts 55' threaded thereonlin opposed relation.h Thus the ;elîective 65 lengths vof the hanger rods‘maylvbe varied lto reg ulate the spacing'of the sheave 2|-- withl respect tothe hand chainwheel as required for any par Thefßlampìllglmeansa asiherein sl’invyn,«ecornprisesrf> a pair-of QDlQQSed Clamping; devices :eachlincluding‘h a base,.,plate 6L having aitransversecentrallyfdis'-i ~ posed sleeveip ortiorr Gbadaptedato'slidahin-receive 1' the bar SG. Adjustably securedfto `the~base plate; asby bolts-_53,12 is .ai clam-ping plate 164:' havingJ its innerVK lowercedgegrecessed :to `extend-over<.and - co'-L operatewith',the-l ñange ‘ofthe»I-lloe'eamßä-«as-shown’L the `clamping,'.means- may-belappliedstotthempper '~ flangeuofgthe .beam if Ídesired# The ~» clampingg devices» may _ be~variably` jposi'# tioned> . and" locked ‘in «place'ion-cooperatiom with` ticular installation; To~enable the power. unit to be installed on-an 70 I-beam~-ñanges of different Widths:N Su‘eh‘jposiá* existing hand _operated crane Without requiring tioning Aand -locking- ~is~ effected#by~means~ of vnuts ^ 65 #threaded-_on jthe" bar~~6€|LJ and-positioned, to,l engage-opposite ends‘ of"the^sle'eve‘62. With the'. Cranathebearing members 53, are preferably of clamping devices properlyjpositioned th‘e clamp? thefsectional type. vAs herein shown, these mem bers'are in theform-of half bushings, one associ 75’ing plates maybe forced into'clamping engage-A disassembly» of the traverse drive shaftfrom the „2,406,889 ,ment with the lflange of the beam by tightening y the bolts 63. . ’ ' , _, ,» '» The other end of the anchoring bar ,65 is like Vof the `type having a traverse drive shaft, `said unit comprising, in combination, aframe the unit so as to permit limited rotation of the including» a housing having a side Wall, a frame member rigid with said wall and `projecting therefrom substantially at right `angles to the -unit relative to'theshaft in either direction. In the exemplary form disclosed thebar projects ing in a second housing having an end wall dis ladapted to be yieldably connected to the frame of through an aperture in a lug 66 integral with the cover plate 28 and projecting laterally therefrom. The yieldable connection between the bar "and _the lug is provided by a pair of coiled compression springs 61 and 68 encircling the bar and inter posed between the lug and stationary members fixed to the bar on opposite sides of the lug. ThuS, spring 61 bears against a collar or washer BQ mounted on the bar and held against endwisc movement thereon by a` pin 10. Thespring 6B plane of the wall, said frame member terminat posed substantially parallel to the side wall of saidçlirst housing, axially alined bearings in said walls,` a shaft supported in said bearings, a sheave fixed to the shaft intermediate the bear ings, a motor secured to the sidewall of said iirst ` housing below said 4frame member, speed reduc. tiongearing enclosed within said first housing drivingly connecting said motor with said shaft, means for supporting said frame on the traverse drive shaft of the crane, and means for drivingly bears against a similar collar or washer 1l on connecting 'said sheave with the traverse drive the other end ofthe rod which is held against shaft. ‘1 ‘3. A power unit for a traveling crane or the like having a, horizontally disposed traverse movement by a nut 12. When the motor M is started to run in either direction the torque applied to the Wheel I4 tends to rotate the unit as a whole, thus compressing one or the other of the springs tl and 6B. The >drive shaft, said unit comprising, in combina tion, a `frame structure including members de fining a pair of housings, a horizontal member resistance to such compression increases progres- ‘ rigidly connecting said housings, a shaft jour sively so that the motor torque is applied grad ually to the shaftV Il to accelerate the ~crane smoothly and with complete absence of shock. naled in the respective housings, a sheave‘ñxed to said shaft intermediate the housings, a motor carried on one ofY said housings, speed reduction The use of rheostats or comparable speed con gearing enclosed in said onehousing drivingly' trollers is thus unnecessary and smooth starting 30 connecting said motor with the sheave carrying ofthe crane is insured at all times. Moreover, shaft, control> means enclosed in the other of the motor M may be of a relatively inexpensive said housings for controlling the operation of single speed type which materially reduces the said motor, a hanger anchored to each of said cost of the unit. ' It will be apparent from the foregoing that the invention provides a power unit of novel and advantageous construction by which a wide variety of manually operated traveling bridge ` housings, said hangers having bearing elements engageable with the drive shaft of the crane to support the frame structure, and means driv ingly connecting said sheave with the drive shaft. 4. A power'unit for a traveling crane or the cranes and comparable chain driven devicesmay like having a horizontally disposed traverse drive be readily converted for power operation. The 40 shaft, said unit comprising, in combination, a unit is simple and compact and interferes in frame structure including members defining a no way with the normal operation of the crane. pair of housings, a horizontal member rigidly By reason of the novel mounting of the unit and connecting said housings, a shaft journaled in the means provided for absorbing the shock and the respective housings, a sheave fixed to said jar incident to the starting of the driving motor, shaft intermediate the housings, a motor carried' smooth, shockless acceleration of the crane is on one of said housings, speed reduction gearing obtained even though a simple, inexpensive single ` enclosed in said one housing drivingly connect speed motor is employed and complicated expen ing said motor with the sheave carrying shaft, sive starting equipment such as rheostats and the control means enclosed in the other of said hous like are dispensed with. Thus, the unit is rela tively inexpensive and yet capable of efficient operation in driving bridge cranes and the like. ings for controlling the operation of said motor, a hanger anchored to each of said housings, said Due to the simple 'manner in which the unit is applied, it may be installed on existing cranes by with the drive shaft of the crane to support the frame structure thereon, and a ñexible member hangers having bearing elements engageable relatively unskilled labor and withoutY requiring 55 drivingly connecting said sheave with the drive any modifications or changes in the crane struc shaft, said hangers being adjustable to regulate ture and, in fact,V without drilling or other the tension of said flexible member. machine operations. Y 5. A power unit for a traveling crane or the I claim as my invention: like having a horizontally disposed transverse l. A power unit for a traveling bridge crane 60 drive shaft, said u-nit comprising, in combina or the like having a horizontally disposed trans ation, a vertically disposed frame member, a verse drive shaft with a hand chain wheel fast iiange around the edge of said member project thereon, said unit comprising a rigid frame >ing from one side thereof to deñne a relatively structure, hangers anchored to said frame struc shallow housing, a horizontally disposed frame ture in spaced relation each including a bearing 65 member projecting from the other side of said element engageable with the drive shaft on op posite sides of the chain Wheel and operative -to vertical member, means forming a second hous connecting said sheave with said wheel, a motor secured to said frame structure, and means driv ingly connecting said motor with the shaft the housings, a motor secured to said vertical frame member below said horizontal frame mem ber, speed reduction gearing in said iirst men ing integral with said horizontal member, said ` Wsupport the unit on the shaft, a shaft journaled second housing being spaced laterally of said on said frame structure, a sheave fast on said first housing, a shaft journaled on said housings last mentioned shaft, an endless driving chain 70 and having a sheave ñxed thereon intermediate carrying said sheave. ' tioned housing drivingly connecting said motor 2. A power unit for a traveling crane or the. 75 with the sheave carrying shaft, motor control 2,406,889 ling means in'said second housing, .meansat tached tosaid housings-’for supporting the frame structure on'the traverse shaft »of 'thecranef and meaHsdriVingIy connecting said sheave withv the traverse shaft. » 6. A power unit `for la traveling crane or-the like «having a horizontally ydisposed drive shaft, said unit comprising, -in `combination, va frame structure including V-a pai-r ïof laterally -spaced frame members, a horizontal member rigidly connecting said frame members, ashaft, -a sheave fixed to said shaft, bearings Acarried by/saidv frame members positioned to support said »shaft on opposite sides of said sheave, a Amotor'mounted on one of said framemembers, speed reduction gearing connecting said motor-with said shaft, posite ends in said members and adapted to be drivingly connected with the traverse shaft, `a motor supported on one of said members, speed reduction gearing carried by one of said mem bers for connecting said motor with said drive shaft, and means rigid with said frame struc ture for supporting it in suspended relationL to said traverse shaft, said supporting means being adjustable to vary the spacing of said .drive shaft 10 from the traverse shaft. 8. The combination with a power unit adapted to be mounted in suspended relation from the traverse drive shaft of a traveling crane having a ñanged bridge member, of a torque arm con necting between said unit and the bridge mem ber comprising a generally crank-shaped bar in means cooperating with said one frame-member cluding a pair of parallel oppositely facing end to- form a'housing enclosing said gearing, other bearings engageable with the drive shaft of the crane to support said frame structure thereon, a flexible member drivingiy connecting said sheave with the drive shaft -of thecrane, and means connecting-said Iother .bearings to the respective frame »members for-adjustment toward and from the members to regulate the tension vof said flexible member. sections and a central section angularly disposed with respect to said end sections, means yield '7. A power unit for atraveling crane or the like having a- traverse drive shaft, said unit com prising, in combination, a frame structure in cluding a pair of laterally spaced rigidly con nected»v members, a» drive shaft jour-naled at op ably connecting one end section of . said arm with said Iunit at Va point spaced substantially from its point of suspension, and clamping means connecting the other end section of said arm with the flange of the bridge member, said clamping means being adjustable longitudinally of the bridge member and said arm being rotat able relative to the clamping means and to said unit so as to hold said unit in an upright posi tion irrespective of the depth of the bridge 30 member. GEORGE A. MITCHELL.