US1267341A - Conveying and distributing mechanism. - Google Patents

Description

S. SHARE, Ja.

cowvivme Ma isrmsum MECHANISM.

APPLICATION FILED MAR.22| |915.

` Patented May 21,1918.

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comms AND msmxsume MEcHANlsM.

AFPUCATGN FLE NEAR. 22, |915. Y 1,267, 341 Paltonfod May 2l, 1918.

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CONVEYING AND NSFHBTING MECHANISM.

APPucmou min maiz. 1915.`

1,267,341 1 Patented May 21,19i8.

gnomi loz SAMUEL siemens, Jn., or MILWA PAN-Y, or MILWAUKEE, W

UKEE, WISCONSIN, ASSIGNOB T0 CHAIN BELT COM- ISCONSIN, A CORPORATION 0F WISCONSIN.

CONVEYING AND DISTBIBUTING MECHANISM.

Specieation of Letters Patent.

Patented May 21, isis.

applicativa inea March 22, 1915. semi so. 16,133.

To all whom t may concern.'

Be it known that I, SAMUEL Snaren, Jr.,

a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin,

have invented certain new and useful Improvements in Conveying and Distributing Mechanism,

following is a specification.

of which the invention relates to conveying and distributing apparatus and it has been elaborated with especial reference to being used as 'the delivery mechanism for the product of a concrete mixing machine.

tion, however, is capable of of applications and uses.

The inven a Wide variety It has especial adaptability to apparatus in which is employed a conveying receptacle arranged to traverse an overhead support suoli as a swinging crane or boom, the receptacle being provided with bottom doors through which the material is discharged. A cabie or its equivalent is employed for moving the conveying receptacle back the said support, and this is employed as the means for operation of the doors of the and forth along traversing cable controlling the receptacle, the

trolled by the operation of and the closing of the doors cept-.wle into condition a charge is also controlled by of the said cable.

the said cable, to put the reto receive and retain the movements ln the accompanying drawings I have illustrated one embodiment of the invention in apparatus for receiving the product of a concrete mixing machine and for delivering it to the place where it is to be used. I do not, however. Wish to be understood as limitm ing my invention by such illustration to the particular combinations and arrangement of parts. and use, thereby' indicated. n such drawings Figure 1 is a side elevation of apparatus embodying my invention;

Fi Q is a transverse sectional view taken on the line Hfll of Fig. l.

Fig. 3 is an elevation of the opposite shown in Fig. 1,

of the machine from that the boom being broken away. Fig. 4 is a central vertical si de sectional view illustratin the parts that control the movements of t e doors of the conveyer bucket, in the positions they occupy when the bucket is about to commence its outward traverse from the loading position.

Fig. 5 is a transverse sectional view taken on the line V-V of Fig. 4.

Fig. 6 is a vertical sectional view taken on the .line V-V of Fig. 3.

Fig. 7 is a detail View illustrating the automatic throvvpff devices for arresting the traverse of the conveyer bucket as it reaches respectively the ends of its travel.

Fig. 8 is a central vertical sectional view illustrating the parts that control the movements of the doors of the conveyor bucket, in the positions they occupy when the bucket is on its outward traverse.

Fie. 9 is a view similar to Fig. 8 except that it illustrates the positions o the parts the moment the lock for the bucket doors is being tripped.

In the drawings, 2 indicates a portion of a concrete mixing machine of the rotary drum type, and 3 framework located near the discharge end thereof. 4 designates a bracket supported by the framework. in which is mounted a vertical pivot 5 that carries at its lower end a casting 6 in which is supported. by a horizontal pivot 7, a crane or boom 8 that constitutes a track or Way along which is caused to travel the conveying and distributing receptacle for the material deliv ered by the mixing drum.

This boom may be of an suitable or desired construction, that il ustrated in the drawings being formed of channel barsytho anges of which constitute the. tracks for the Wheels 10 of a carriage 11 from which is suspended a conveying bucket or receptacle 1:2. The boom is preferably vertically adjustable about its pivot 7, a cable i3 being employed for the double purpose of effecting such adjustment and also supporting the boom in an extended osition. Since the means for adjusting t e boom about its pivot 'i' form no part. of my resent invention they are neither descri d nor illus trated in this case. The carrie. 11 preferably comprises a pair of side pieces 14 suitably united and carrying the wheels 10 and links or bars 15 supporting the bucket.

Motion is imparted to the carriage to cause it to traverse the boom or crane by means of a cable 17 which is referably in the form of an endless chain Ibelt or drive chain. This chain belt is supported upon a driving sprocket wheel 18 mounted so as to turn freely upon the shaft constituting the pivot 7, and another sprocket wheel 18 suitably mounted at the outer end of the oom. If found desirable one or more intermediate Supporting idler sprocket wheels 19 may be employed for sustaining the upper strand of the chain belt and preventing it from sa ging undesirably. l

he bucket 12 is preferably of the bottom-discharge type, being provided for thaturpose with a pair of hinged doors 91. hese I arrange to open outwardly and to them are connected links or chains 2l) that in turn are united with an eye bolt 21 supported in the lower end of a curved lock link 22, the upper end of which is pivoted to an arm 23 rigidly secured to an axle or cross shaft 24 mounted in the carriage 11. 25 indicates a handle secured to the shaft 24 and serving as the means by which the doors of the bucket may be opened and closed manually. The arrangement for controlling the operation of the doors thus far described is one Well known in the art, being described and claimed in U. S. Patent No. 605,62() to Alfred M. Acklin, and constitutes a toggle lock for holding the doors closed, and that may be easily tripped or broken, allowing the doors to open own weight and that of the load which they sustain. It sometimes happens that obstructions are encountered preventing the doors being tightly closed. It has therefore been found desirable to support the eye bolt 21 yieldingly, it being surrounded by a coiled spring 26 that, yielding, prevents harm or breakage to the mechanism should a stone or other article prevent the doors properly closing.

The chain belt cable 17 is employed to move the bucket and its carriage or trolley along the boom from the position, close to the mixer, Where it receives its load, to the place of discharge, and also to open the doors of the bucket for discharging its contents, and for closing the doors to put the bucket in condition to receive its charge, so that a single attendant standing uponv the operators platform of the machine can readily and accurately control all the movements and manipulations of the bucket.

27 represents a sprocket segment loosely supported upon the shaft 24 with its teeth in engagement with the links of the chain belt 17. The sprocket se ent carries a contact arm or piece 29 an a gear segment 28, these parts being preferably integral and the gear segment carried by the hub of y their the sprocket segment and concentric therewith. 3() represents a chain guard or stirrup supported in the frame of the trolley 11 and disposed directly over the sprocket segment 27 and operating to hold the chain in engagement with the teeth of the latter. 31 indicates a gear, preferably of segmental form, loosely mounted upon a pivotal support 33 in the frame of the carriage or troley and in mesh with the gear segment 28. The gear 31 carries an arm 32 at the end of which is loosely pivoted a finger or arm 34, one end of which, 35, is weighted, and the other formed into a contact device 36, adapted to engage with an offset part or projection 37 of the arm 23. 38 indicates a stop carried by the frame of the carriage with which the contact piece 29 of the sprocket segment 27 is adapted to engage and by which the extent to which such se ment may move in one direction is determined. The operation of the parts just described will now be set forth, it being assumed that the bucket is in its innermost position, that is, located adjacent to the 'mixing drum and below the delivery spout 39 thereof, and the parts in the positions indicated in Fig. 1.

When the bucket has been illed and it is desired to move it outward along the boom to the place where its load is to be discharged, the operator, through suitable driving mechanism, such as will be presently described, causes the lower strand or run of chain belt to move outward. This chain belt, as has been described, is in engagement with the sprocket segment 27, mounted in the bucket carriage or trolley, and the latter, which is free to turn upon its pivotal support 24, has been already rotated in one direction as far'as permitted, since the contact parts 29, carried by the sprocket segment, and 38, upon the carriage, are in engagement. The outward movement of the lower run of the chain belt 17 thus causes the outward traverse of the bucket and its carriage to the place of delivery, arriving at which place the movement of the chain belt is arrested. As represented in the drawings when the sprocket segment occupies the position just described the arm 32 1s brought into such position that the push-ofi' finger 34 lies in engagement with the end of the arm 23, or with the offset or contact projection 37 thereof, where it is held by the wei ht 35. The bucket being at the place of ischarge and the arts still in the position indicated in full ines in Fig. 1, the operator starts the cable or chain belt 17 in the reverse direction to that just described, with the result that the sprocket segment is turned upon its shaft, the trolley and the bucket which it supports yet remaining at rest at the place of discharge. This movement of the the bucket as it is linger 34, movin sprocket, segment communicates motion to, the ear segments 28 and 31, the arm 32 whic the latter carries, and the push-o inger or arm 34; and as the latter 1s in engagement with the upper end of the arm 23, to which the lock link 22 for the doors of the bucket is connected, the movement of the parts just described operates to rotate the said arm suiciently far to carry its outer end over or across the axial line of the shaft 24, thus breaking the toggle lock that holds the doors of the bucket securely closed and permitting them to 'quickly open under the weight of the contents of the bucket, which is thereu on discharged, the parts then assumin t e position indicated in dotted lines in ig. 1. As soon as the cable has moved far enough to effect the results just stated, its motion is again arrested. As the arm 23 moves from the position indicated in full lines in Fig. l to that shown in dotted lines, the projection 37 thereof comes into engagement with one of th spokes or radial arms 40 of the sprocket segment, carrying it to its extreme limt of movenient in one direction, with* the contact parts 29 and 38 in engagement, where, being arrested,-the segment operates as a support for holding the doors from further movement outwar The movement of the gear segment just described, under the iniuence of the `wei ht of the contents of ei'fig discharged, will cause a slight traverse of the bucket along the boom, but this is so small in extent as to be negli ible. The charge of the ,bucket being de lvered, the bucket may now be restored to charging position, and this is effected by the operator causing the chain belt or cable 17 to be moved'in a direction to draw the trolley-and its bucket toward the mixing machine. The first movement of the cable or chain eelt causes a rotation of the sprocket segment, this taking place beforeY t e trolley begins its inward traverse, moving the parts from the position indicated in dotted lines in Fig. 1 to the ositions indicated in Fig. 4. As the sprocliset segment is rotated it operates to close the doors of the bucket, bringing them to toggle-locked position, by reason of the engagement between the projection 37 and ,the spoke 40 of the sprocket segment. When the parts are in the position indicated in Fig. 4 the push-ofi` finger 34 assumes the osition there indicatedY by reason of the act that the weighted end 35 thereof rests upon the hub of the gear 3l. As the doors are being closed, and the parts are moving from the position shown in dotted lines in Fig. to the position indicated in Fig. 4, the projection 37 passes theiend 36 of the push-olf outside the latter, that is, in an arc outside said part 36, which is held inward, or toward the centerfabout which the projection moves by the engment of the weighted end of' the p o lever with the hub of the' gear 31 just refered to. Continued rotation of the sprocket segment is arrested by reason of the engagement of vthe look link 22 with the cross shaft 24, after which further movement of the chain belt operates to cause a traverse of the carriage along the track toward the mixing machine. As the sprocket segment is moving, in a clockwise direction, motion is communicated to the gear segment 28 and its arm 32 in a contra-clockwise" direction. As the push-0E gear and finger rotate about a center to one side of the shaft 24, and as the latter is loosely pivoted, it

passes below theupper connected end of the Y ook link 22, allowing it to come into proper or locked position without material interference. Just before thetrolley reaches the inner end of the boom the operator may stop the movement of the cable, rmitt' the trolley and its bucket to finish their inner run under the inuence of inertia or momentum. This results in causing a turni of the sprocket segment and'of the push-o devices to the positions indicated in full lines in Fig. l, that is, with the push-oli' finger in engagement with the projection 37 at the upper end of the arm 23, and'agaiu ready for the outward traverse of the bucket, as has been described, whenever it may have received its charge. I will now describe the means shown in the drawings, and which I refer to use, for ,driving the cable or chain t 17.-

0n the main counter-driving shaft 41 of the concrete mixing machine is secured a sprocket wheel 42 from which power is trans xmitted by means of a chain 43 to a sprocket inion 44 on a horizontal shaft 45. This shaft 1s supported in bearings carried by the boom pivot bracket 4. A dou le cone casting 46 constituting the driving portion of a double friction clutch is secured to the shaft 45 and rotates therewith. Supported loosely upon the shaft 45 are the two bevel gears 4 to which are respectively secured cone sections that coperate with the movable clutch casing 46. The bevel gears mesh wi a bevel pinion 48 upon a vertically disposed shaft 49 that Y.passes axially through 'the vertical pivot 5 vof the boom and carries at its lower and a bevel pinion 50. This latter meshes with a bevel gear 51, to the huh of which is secured the sprocket wheel 18 that en with and drives the chain belt cable 17. 2 represents the hand lever by which the operator controls the movements of the traversing cable, it being connected throu h a suitable train of devices with the mov :soV

Velement 46 of the clutch. When the handle t is moved in one direction lthe cable is driven in a direction to cause the bucket to be traversed outward; when moved in the other direction, to be traversed inward; and when it occupies a mid-position the clutch elements are out of engagement .and the traversng cable is at rest.

By the mechanism described it is entirely feasible for the operator to control all of the movements of the bucket,-its traverse backward and forward, its discharge, and its closing or restoring to charging condition-, throii h the proper manipulation of the hand ever 52. It is, however, often desirable to provide automatic means for limiting the traverse of the bucket in each direction, stopping it when it reaches the place of discharge, and a ain as it comes to position to receive its loa and I will now describe the mechanism which I have devised for thus limiting the movements of the trolley and bucket. b

54 desi ates a bevel pinion e d y the bevel t(iivllieels 47, and preferablinged diametrically opposite the bevel pinion 48. It is secured to a vertical shaft 55 on which is mounted a spur pinion 56, the latter being preferably integral with the bevel pinion 54. This spur pinion meshes with a spur gear 57, the hub of which turns freely in a stationary bearing 58 provided therefor. The hub of the spur gear 57 is elon ated and formed into a nut 59 with whic engages a screw-threaded shaft 60, that is caused, by the turning of the s ur wheel and nut to be moved longitudina ly, either u wardly or downwardly, according to the irection in which these parts are rotated. One end of the shaft 60, preferably the lower end, is pivotally connected with a shifting lever 6l that is supported between its ends upon a vot 62. The outer or free end of this shi ting lever is forked so as to form the arms 63 in which latter are mounted relatively long adjusting screws 64. An arm is secured to the hand lever 52 by which the drivin of the cable 17 is controlled, or to the sha t on which the said hand lever is mounted, and its free end lies between the ends of the screws 64.

From the fore oing description, taken in connection with tie drawings, it will be Seen that the nut 59 is rotated whenever the traversing cable is driven, this nut operating the shifting lever 61. The screws 64 carried by the latter are so adjusted that one of them comes into en agement with the arm 65 and operates the c utch to throw it into its mid or neutral position, thus disconnecting the cable from the source of ower, whenever the trolley approaches the inner end of the boom, that is, just as, or before, it reaches the charging position. The other adjustable :1er-.fw comes into engagement with the arm 65 and through it operates the clutch to engage the cable from its source of power when the bucket and trolley reach the position for discharge. By adjusting the screws 64 the respective limits of the traverse of the bucket and trolley may be accurately determined.

I employ the term receptacle in the following claims in a broad sense, intendin thereby to include both the receptacle itsel and its support, which, in the particular instance illustrated, is the trolley or carriage and its supporting wheels, it being quite immaterial for many uses of the invention whether the receptacle be supported from above or below, and whether its supporting wheels be mounted in a separate trolle or carriage, or connected with the body o the receptacle itself.

What I claim is 1. The combination of a track, a traversing cable supported so as to move parallel with and adjacent to the track, a discharging receptacle supported entirely by the track and arranged to be traversed thereon by the cable-in one direction when loaded and moving to the place of discharge, or in the opposite direction when empty and moving to the place of loading-the receptacle being movable on the track to a limited extent relative to the cable, means operated by the relative movement of the receptacle and cable for causing the receptacle to discharge, and means carried by the receptacle and operated by the cable for positively restoring -the receptacle to load-containing condition after discharge, by moving the cable in the direction to return the receptacle to the place of loading.

2. The combination with a track, a traversin cable supported so as to move parallel with and adjacent to the track, a discharging receptacle sup orted entirely by the track and arrange to be traversed along the track by the said cable and movable along the track relative to the cable, and means for holding the receptacle in load-contaim' condition, of means operated by the ca le when it is moved in one direction, and arranged first to trip the receptacle and permit it to discharge, and then by a further movement in the same direction, to again restore the receptacle to condition to receive and hold another charge.

3. The combination with a track, a dischar 'ng conveyor receptacle supported there y, a cable independent of the receptacle and free to move to a limited extent relative thereto for causing its traverse, and means for locking the receptacle in loadcontaining condition, of toothed gearing intermeshing with the cable and having means to be operated thereby when it is moving independently of the receptacle, to positively meneer operate the locking' means that liol the bucket, to consceJ discharge thereof.

4'. The combination with e. track, a, discharging conveyor receptacle supported thereby, a cable independent of the receptacle and free to move to a limited extent relative'thereto for causing its traverse, and means for locking the receptacle in loadcontaining condition, of toothed gearing inter-meshing with the cable and having means to be operated tiereb when it is moving in one direction and independently of the receptacle, to positively operate the locking ineens that' hel'the bucket to canse a discharge thereof, and operated also by a further movement in the seme direction to restore the rece nele toV condition to receive and hold enot er charge.

5. I3-*he combination with e track and o colrveyingV rece fascio' supported entirely thereb'of e ce leor causing' theV traverse of the receptacle amdfree to move to a limitedV extent reieltve'thereto, the cable being of drive chain construction, and toothedV connections in' engagement with the said chain cable end positively operated thereby, sind liovinglrmenns VtoV cause tlie receptacle te discharged.

6; The combination with e track and e cemneying"Y receiitccle supported entirely thereby, 'ein cbleVv for causing the traverse ofthe-'receptacle :indirecto move to e limited extent relative thereto, the cable being of drive chain construction, and toothed geni-ing inengagemcnt with the chain cable endopereted tliereby, having means to posij tivey restore the `receptacle to normali condiioir totrefceive a. loadv after it has been die cherged 7: VrEliefcombinationYwith a track, a conveyin receptecle supported by the track, provi ed with doors for closin it, and means connected with the doors y which their movements may VbeV controlled, of e cable for cousin the traverse ofthe receptacle, Ineens havin intermeshing connection with the cable en' supported by the receptacle arranged to operette the ineens that control theV movements? of the doors, and stops; corriedy'tiie receptacle for limiting the extent torvihich the said cable-operated means maybe moved independently of the receptacle.

8; Theseomenetien with a track, e conf veyiiig" receptacle supported thereby provided vvitlidgorsf'fijcclosing it and petting it in co1iflitioiitoretirinn charge and toggie lockingmeans connected with the doors by whiclithey may be closed and heldY in' closed position, of: e iceble for causing the traverseY of the receptacle along the track, andrneens supported' by the receptacle, having intermesiiing connectionwiththe cable, and free to move to a limited extent relative to the receptacle and arranged to not upon the seid toggle locking means and restore the doors 1o closed position after they have been opened Whcirthe cable is moved in one direction.

9. The combination with a. Track, s. con vering receptacle supported thereby provided with closing doors, and toggle locking ineens for holding the doors closed, of :a cable for causing the traverse of the receptacle along the track, n, gear element having intermeshing connection with the cable, snpportcd by the receptacle and movable rele tivethcretc, stops Vtor limiting the extent to .vlii'oh the seid gear element may be moved, andmenns opcretedib the gear element for moving the toggle loc ing menneY to permit the doors lo open when the cable isY moved in one directions further movement of the robleV inthe Sonie direction beingV arranged through interconnection between tire seid gein' element and the toggle locking means, to restore the letter to locking position.

10. The combination with e track and e demping conve ing receptacle supported thereby, of s 'crible for causing traverse of the receptacle niong the track, and ineens supported by the receptacle having intermcsbing connection With and operated by tbc cable, and comprising e part arranged to move in one direction to :1ct on the receptacle to dem it, and another part moving in the opposite directionV to restore the receptacle to s position to receive oV charge, the said parts opeinti'ngV in' secccssion;

11. The combination with e track, a conveying receptacle supported thereby, and providcdivith doorsfor controlling the discharge of the receptacle, and toggle locking means for theV doors.V of' e cable for ceusing the traverse of the receptacle, n gen1' element supported by the receptacle, having inten meshing connection with the cable Eind free to move to e limited extent relative tothe re ceptncle, such element having means for closing seid doors when being moved relaitive to tbe receptacle by the reverse movement of the cable, and means also operated from the cable for'tripping the toggle lock to pernit the doors to open.

l2; The combination with a treck, e conveying receptacle supportedY thereby having doors Yforcontrollin its discharge, and tog- Ule'loekiiig means or the doors, of e cable lor causing the traverse of the receptacle, a. geer'element snpported'by the receptacle and free to move to e limited extent relative thereto end having intermeshing connection withV the cable, end menne ogereted'by the solidi gear element for causing s. tripping of the'toggle lock to permit the doors to open, the seid gear element end tripping means being bioogiiti into operation upon e reverse movement of the cable, the tripping means operating first to trip the toggle lock, and the gear element operating thereafter to close the doors.

13. The combination with a track, a conveying receptacle supported thereby provided with doors in its lower part for controlling its discharge, and a toggle lock connected with the doors and pivotally supported by the receptacle above the doors, of a cable for causing traverse of the receptacle along the track, a gear carried by the receptacle having` intermeshing connection with the cable and loosely supported upon the saine axis as that about which the said toggle lock turns, stops for limiting the movements of the said gear element whereby when it arrives at either limit of its movement relative to the receptacle motion may be communicated to the latter through it from the cable, and an arm in gear With and operated by the said ,gear element arranged to push over the toggle lock and allow the doors to open upon the motion of the cable being reversed.

l-t. The combination with a track, and a dumping conveying receptacle supported thereby` of means for restoring the receptacle to condition to receive a charge and maintaining it in such condition, tripping devices acting on the last mentioned means to permit the charge in the receptacle to be dumped, a cable of drive chain construction for causing the traverse of the receptacle along the track. a gear supported by the receptacle in mesh with the said chain cable, the gear being supported so as to be free to move to a limited extent relative to the receptacle and the means to restore and maintain the receptacle in condition to receive a charge, suoli means and the gear being arranged to come into engagement after the latter has been tripped and the receptacle discharged, whereby on the reverse movement of the chain cable the gear acts on said means and restores the receptacle to condition to receive a charge.

15. The combination ot an elevated track, a trolley arranged to traverse the track, a convey ng receptacle provided With hinged doors suspended from the trolley, a cable of drive chain construction for causing the traverse of the trolley, toggle locking means connected with the doors for holding them in closed position, and gearing supported in the trolley and free to turn to a limited eX- tent thereimmeshing vvith and driven by vthe chain cable, the said cable-driven gearing being arranged to trip the toggle locking means for the doors to permit the receptacle to be discharged upon being moved relative to to the receptacle and having means operating to positively restore such toggle locking means and the doors to their respective locking and closed positions upon the cable being moved in a direction to return the receptacle to charging position.

lo. The combination of an elevated track, a trolley arranged to traverse the track, a dumping conveying receptacle suspended `troni the trolley, a cable of drive chain construction tor causing the traverso of the trolley and receptacle, gearing supported in the trolley and free to turn to a limited extent ther, meshing with and driven by the chain cable, a guard carried by the trolley for maintaining the cable in driving engagement with the said gearing, and means actuated by the said gearing as it is moved by by the cable arranged both to trip the receptacle to permit it to dump its charge, and thereafter rest-ore it to condition to receive another charge.

17. The combination with an overhead track, a trolley arranged to traverse the track, a conveying receptacle provided With bottom., hinged doors suspended from the trolley, and toggle locking means pivotally supported in the trolley frame and connected With the doors for holding them closed, of a cable of drive chain construction for causing the traverse of the trolley and receptacle, a gear segment pivot-ally supported iu the trolley t ame on the same axis as the aforesaid toggle locking means, and free to rotate to a limited extent relative to the trolley and the toggle locking means, an arm pivotally supported in the trolley frame, gearing between the said arm and the cabledriven gear` and a push-oli finger carried h y the said arm and adapted to engage with the toggle locking mechanism, the said parts beingl arranged as described whereby on a reverse movement of the cable the arm carrying the push-olf linger is caused to act on the toggle locking devices and move them to release the doors, permitting the discharge of the contents of the receptacle, and tl'iereatter, on further movement of the cable, causes the cable-driven gear to restore the toggle locking devices and the doors to closed and locked positions.

18. The combination with a track, a conveying receptacle supported thereby, a cable t'or causing the traverse of the receptacle, gearing for driving the cable, and a reversing clutch device through Which power is transmitted for operating the cable-driving gear, of a nut and screw in engagement therewith` gearing between thc cable-driving gear and the nut and screw for causing the rotation and traverse of one of the latter, a lever operated by the last referred to traversing member provided with a bifurcated end, adjustable contact pieces supported in the bifurcated ends of the lever, and an arm through which the clutch is shifted located between the said adjust-able Contact pieces,

the said parts being arranged to causo the clutch to be shifted to neutral position :1S the receptacle reaches each limit of ils traverso.

19. In a. machine for delivering mixofl concrete, the combination of a swinging looom, a braokot in which the boom is snpporfed by vertical pivot, a conveying rooeptacle supported upon the boom, a crible for (3a-using the traverse of the roccptdclo along the boom, gearing for driving the cuble including power transmitting parts ooncontric with the Suid vertical pivot of the boom, :i reversing clutch through which power is transmitted for operating the said cable-driving gearing, clutch-shifting mmm adapted to be manually controlled, a lever for aiso operating the clutch-shifting moans, and means friven from the said concentri- Caoliy-disposod cable-driving gearing arrunged to operate the said lever anni through it more die clutch-shifting menus to neutral position whenever the conveyor roceptaclo arrives al; either limit. of its traverse.

SAMUEL SHAFER, JR.

Titrwsses:

H. Gr. FAWGETT, GEO. B. WELSER, Jr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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