US1775983A - Concrete mixer - Google Patents

Description

' s ept. 1s, 1930. c. J, WEBER 1,775,983

CONCRETE MIXER Filed June 16, 1928 7 Sheets-Sheet 1 Sept. 16, 1930. c. .1. WEBER CONCRETE MIXER Filed June 16 1928 7 Sheets-Sheet Sept. 16, 1930. c. J. WEBER 1,775,983

CONCRETE MIXER Filed June 16, 1928 '7 Sheets-Sheet 5 f@ Mw, WDM MM Sept. 16, 1930. C. J. WEBER CONCRETE MIXER Filed June 16, 1928 '7 Sheets-Shea?l 5 KFZ sept. 16, 1930. c, WEBER 1,775,983

CONCRETE MIXER $535 MMI/L w@ sept. 16, 1930.

c. J. WEBER 1,775,983

CONCRETE MIXER Filed June 16. 1928 7 Sheets-Sheet '7 ffm/c T10/v gj/@m @M Mmmm/wm Patented Sept. 16, 1930 UNrrsEn sra'rss earner ermee CHARLS J. OF CHICAGO, ILINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE'FOOTE GM'PANY, ENC., 0F NUNDA, NEW YORK, A COROl-ATLON OF DELAWARE ccivc'nnfrn MIXER Application filed June 18,

VMy invention relates, generally, to concrete mixers and pavers and more particularly to improved means for charging the mixer with aggregate' and water and to improved means sfor controlling the operation of the discharging means. Y

It is an object of my invention to provide improved means for raising and lowering the charging skip of concrete mixers and pavers li'inl Vwhich the use of wire rope cables has been eliminated. i

'A further object is to provide improved means "for operating the charging skip which permits of a decrease in the over-all height of the mixer. Y

` A'urther object -is to provide an improved means for raising' and lowering the chargingskip of a concrete mixer which is automatically held in raised position and requires the applicationof power t'ov Vlower it.

` A further object is to provide improved automatic' means for controlling admission of water.

further object is to provide improved means for controlling tlieoperation of 'the discharge chute.

Other objects will. appear from the following' description, reference being had to i the accompanying drawings, in which- Y Fig. l is a side elevation of a concrete mixer which shows, generally, the improvements of "my invention; 4

` Fig. 2 is a perspective view of the chargingend of the concrete mixer showing the charging skip in elevated position;

Fig. 3 is a side elevation of the charging end of the mixer showing particularly a por tion of' the means utilized to control the operation of `the discharge chute;

AFig. 4: is anelevation of the side opposite Fig. 3 showing particularly the means for controlling the admission of water;

Fig; 5 is an elevation of a portion of the ni`eans used to control the operation of the discharge chu-te;

Fig: 6 is avpersp'ective view of the clutch and gearing mechanism utilized to operate the charging skip;

Fig; 7 is a some-what diagrammatic plan 1923. Serial ITo. 285,991.

view of the gearing utilized in raising and lowering the charging skip; I

Fig. 8 is a detail view of the reversing clutch mechanism for raising and lowering 'the charging skip; and

F ig. 9 is a fragmentary sectional view taken on the line 9-9 ot' Fig. 7 and showing particularly the charging skip elevating clutch knock-out mechanism.

In the past it has been common practice to utilize cables, usually one attached to each side of the charging skip, to raise and lower the same. This method of operating the charging skip has serious disadvantages in that the over-all height of the mixer is greatly increased due to the necessity of having elevated cable sheaves or winding drums placed some distance above the top of the mixer.

The superstructure necessary to hold these sheaves or winding drums must frequently be dismantled to permit the mixer to be shipped by railroad and to permit it to pass beneath bridges and other obstructions over the highway; rihe dismantling and reassembling of the su l erstrncturc not only consumes a great amount oli time, but occasionally, due to the relatively unskilled labor commonly employed for this type of work, the superstructure is not assembled properly.

Furthermore, the wire rope or cables employed in raising the charging skip rapidly wear out in use, requiring frequent replacement and consequent loss duringrthe time which the machine is necessariiy idle while making such replacements. In some instances, the cables break, permitting the charging skip to fall. The falling of the charging' skip has in the past resulted in a number of serious and several fatal injuries to the workmen. in the construction which I have invented I have entirely eliminated the use of cables Jfor hoisting the charging skip and have provided skip elevating means which automatically prevent the charging skip from falling. The improvements of my invention are particularly adapted for use in the Foote concrete pavers but with suitable slight changes may reaffily be incorporated in any concrete mixer or paver.

1 io c Y v end ofthe drumand is adapted to guide the*l i Referring to Figs. and 6, ythe paver voom-v 'Y rihe miXer includes the usual rotary mixing drum 16 mountedfor 'rotation' upon trunnion rollers 18, the drum'beingrotated-by one or l more drivingr pinions 22 which are in mesh withringgears sccuredtoithedrum. A

charging spout 24 is mounted at theV charging aggregateinto the drum. A; charging skip` Means for raising and lowering the charg-y ing skip c Thejmixenis driven vbyan engine or motor l VOwhich, asrepresentedinFig; 7, isfcon-` nectedthrougli a suitable gearspeed reduc-v tion mechanism to a drive shaft 32. The Vshaft 32 (Figs, 6l and z7 has adrive gear'34 and a sprocket-36 non-rotatably secured thereto.y The drive gear 34meshes witha driven gear 38 which is normallyfreely rotatable uponlfa kcgmntershfaft 40 and ris formed integral with alg aplate`48, the sprocket and plate being-freely i rotatablefuponjtheshaft 40., f A

The plate 48, together witha similar plate i jandlafvfrictiondisc'52, Yform a. friction clutch, theplate 50rhavin-g a hub kk51 with a The end of the'hub;listaperedso asto'be adapted'toengage'clutch fingers 62 andthereby ,operate-the friction clutchy containedwithc inthehousing 42. The hubv 51 is keyed to the i shafti- Oand thus is adapted to form a driving iowereag By manga@ link ce', ai@ Shaft ea `5^5 ywillbeoscilla'tedY clockwise (Fig 9) lsol as vto connection between either y.thel vclutch housing 4 2 or the plate 48 andthe shaft,.depending uponwhether isthrown to the right or the secured thereto,alink 66'beingpivotally connected `attheend vof the arm. lThe upper endofthe'link 66 is connected Vto ais'uitable op-l eratingih andlev` whereby it ymay be Vraised or throwfin the `clutch within' the *housing 142,- whereasl when thelink'66 .is opera-ted down# 'Y Y wardIy, itr will rrotate the shaft 6 0 counter: clockwise and throw in the friction clutch 484.52%50. '111 y y 3.` j

The endof the shaft carries an arm 68', at the end of whicha linkis pivotally con- I xnected.:l As' vwill hereinafter appear, the link' '7 0 ismoved to the leftV (Figs. 7 and 9) ast-he charging skip reaches its uppermost position,

Y 1,775,983 l A IThe usual steel ries a spur-gear 80;',y The spur-gear 8O meshes -1 with a pinion 82keyed on ashaftl jfllhef f shaft 84carries a1w'0r1n86whichisin engage-k' nientjwitha worm? wheel y88,gthe-'latter being "keyed toashaft 90.-V 'A pair of pinions 92 andv Y 26 is pivoted'at28 in bracketssuitably' se-- 1 'oured'to the frame of the machine. f

94 is keyed -to the' ends `of the shaft 90. AThe worm and worm wheel are'preferably'mount' A pair of elevating'arms198,99

thereby to disengage the clutch within the Y housing 42; l1 Y '-f Y The countershaft '40 has Vasprocket 72se- 'LS-keyedat: the ends of a shaft` 1Q() which is; Arotatably mounted in :suitable bea-ring?fbrackets''162.v Spur-'gear teeth` `104, 'eut atthefher/ends. Of! the arms 98,599, form segmental gearsfwhich are in meshwith-the pinions-92and 9 4', re; i.

spectiveiy The outer endsjofthe` arms 98,3992 carry; a vbail rod 106. Links ,108,2 pivotally. i `'connected togbrackets'llOvboltedj or,l rivetedetoaj the charging skip', have elongatedjSlLjSf 112 Q formed'at- .their lower-ends,- these slotsreceivv k.ing thebailrodjorshaftr106. Suitable collars? f 114 on the shaft 106 prevent'lateralmovement` of the links. i' f .The kPLTQHQQ has apin 116e.iggflg'lg,SigellY f Yward-ly therefromwhich adapted, Strybel` .n p charging skipappponches'.its uppemostPQ*1r`r L sitionfto contact'with theuppervefnd ofafle-g j i ver 118 which is pivoted at 1 19andsw-ing it.;

the skip'elevating l Y Disc/argc chutecontrollngjmechanism It is desirable', machinesvofthisl kind, to i' vprovide means for insuring that the "discharge i chute isi in noil-discharging'.vv positiony ias Vthe chargingskip reaches its velevated or 'charg- W ing position, and if the discharge'fc'hute' h apl pens to be in.dischargingposition, ,2'u1tomatif vcally to move it .'to non-'discharging position 1 as thecharging skip ifs'be'ing'elevate'dgl have f provideda simplemech anismforaccoinplish-V `ing. thSpuEpOse-r. i, f l t jAcam plate-120isfsecured-to'thepinion-921:Y i and is adapted to'engage:arollerpini122r carried at theend o fone armof'a,b ellcrankleven 1" 124,-the latterlbeing,pivotallyffmounted"in @bracket 126 secured to the frame offthe machine. Dur-ing the*y initial elevatingmove Y ment of thecharging skip', the cam plate -120 engages the roller pin 122'andswings thezbell l crank 124counter'clockwise (Fig. thereby` moving lupwardly a rod 128 which Vis pivotal# ly connected to the other armof the bell crankA lever upper end of the rod 1 28 is iso Y counterclockwise '(Fig. 3);,thereby rnoving Q v a@1mm@aerialme..e @time g (Figs. 7 and 9). itspreviouslydescribed-.5v

Asuch movement oftheelink 'Olwillthrow, out

pivotally connected: to the 'end-of an arm 130 which is keyed to a shaftl132. f

The end ofthe shaft 132- has a bevel gear 134 keyed thereto, the latter meshing with asimilarvbe'v'el gear 136 secured tothe end of a shaft 138. It will thus be seen that through the above described connections, the' shaft 138 will be rotated clockwise (Fig. 5),

when the charging skipV is being elevated and, as willV hereinafter appear, the discharge chute is in discharging position.

it L

An arm 140 (Fig. 5) is attached to the end of the shaft 138' opposite the bevel gear 136, the end of this arm being pivotally connected to a link 142 which at its lower end is pivotally connected to one end of a lever 144 which is suitably pivoted to the stationaryframe at 146.

A spring 147, anchored to the frame at one end and to the end of the arm 140 at the other, normally tends to hold the parts in' the position shown in Fig. 5.

The end of the lever 144 lies between stop pins 148 and150 which are secured upon a link 152. The link 152 connects the end oifan arm 154 with an arm 156. The arin 154'is keyed to a shaft 158 to which a hand operating lever is also keyed.l The arm 156 is keyed to a shaft 162 which also carries y i an arm 164', at the endvof which a roller 166 is rotatably` mounted. The roller 166 is adapted to 4drop into one of two notches 168 formed in a -d'ru1n'170, the drum 170 being a part of a planetary gear train which is more ullydisiclosed and described inthe is pivotally connected to an adjustable operating rod 184. The other end' of the latter is pivotally joined to a rotatably mounted ldischarge chute frame 186 which carries the discharge chutev 188. j

A cable 189 of flexible wire rope, connects the end of arm 174 of the bell crank 176 i (ic-- with the end of arm V140 for a purpose as will hereinafter more fully appear.

As willl more fully appear from the afore- 1' saidpatent, clockwise movement (Fig. 5) of the arin 156 will raise the roll-er 166 out of its notch and at the-saine time tighten the brake band 190 which will serve to connect the power drive to rotate thepdrur'n 170 and hence lower the link 178 and thereby move the discharge chute to; discharging position. As soon as the drum has rotated through any angle of degrees, the roller 166 will drop into the opposit-e'notch 168V and thereby release tension on the brake band and disengage the power drive connection.

Water control mechanism As more fully disclosed in the patent to Foote, No. 1,590,359, granted June 29, 1926, the mixer is provided with a water tank 192 and a three-way valve 194. This valve is adapted to be opened by raising a link 196 which at its lower end is connected to an arm 198.` The arin 198 has a sidewardly projecting ear 200 and the long arm 202 of a bell crank lever 204 has a similar sidewardly extending lug 206 formed integrally therewith. lugs and a spring 210 is compressed between the lugs, thus forming a cushioning buffer between the arms 198 and 202.

The arm 202 has one end of a spring 212 secured thereto, the other end of the spring being suitably anchored to the frame of the machine. The bell crank lever 204 has a short arm 214 having a pin and rolier 216 which is adapted to engage the flanged sui'- race oi? a cani plate 218 which is rigidly secured to the elevating arm 98.

As the arm 98, and hence the charging skip, approaches its' uppermost position, the surface vof the cam 218 will engage the roller and pin 216 and swing the bell cra-nk lever 204 clockwise about its, pivot 220, thereby through the buffer connection raising the link 196 and opening the three-way water valve to permit flow of water from the tank 192 into the drum.

Operation v Assuming the charging skip to be in its lowermost position and a. charge having been loaded therein, the operator will raise 98, 99. The arms 98, 99 will thus be moved counterclockwise (Figs. 1 and 4) and after taking up the lost mot-ion due to the elongated slots 112 in the links 108, will, through the links 108, raise the charging skip. rEhe elongated slots 112 are provided so that the skip may be moved downwardly to diilerent degrees, depending upon the level of the ground adjacent the mixer.

As the charging skip is beingelevated, it

is desirable, of course, to move the discharge L- chute to non-discharging position if the chute is not already in that position. This is accomplished through the following train oflin'kagc and gea-ring:

Thev cam 120 on the pinion 92 will, if the A bolt 208 passes between these two L discharge vc hntelis in diseharging'riposition, engage, the pink and roller 122-Qn theffbell.

v crankr124 and move the latterc0nnterolock Wise, raising; the .1ink`x128, osoilletinggthe shaftlSO'clockWise, (Figi. 3) and thereby oscillatingl the shaft 1138 clockwise 5.) Clockwise rotation ofthisshnft with its nrmjV f v140 `Will depress linkl 142 vand`r` thereby pivot; v yleverlllt about itspivotexisll, reisingl'they lo right-hendend of this lever'until it engages; w the pinf150; `and vthereby; raising they linkf y `'152 Whichiny turn Will operate the power' i fthe sheft 138 in the position-shown-inFig; VVl/hen'thesepartsfare inl this position, the

bell crank12/lf-Will have been moved counter-Q clockwise to `its furthest position so that itspinroller 122Will not'lie yin the pathofcemf plate 12ddischarge mechanism to move the discharge chute to the non-discharging position shown in Fig 5.V` It, however, `the dischargey chute: is l:already in no'n-discharging` position, 'the spring` 11M'v will' hold the varm 140 andhence When, however, thel dischnrgechute*isjin ,Y ,dischargingposition,y as shown in dotted Vlines iin Fig. 5, theceblelfSQQ-yvillhave been` pulled downwardly, thereby swinging-.the

l When thefchergingskip arm 140 slightlyiclockwise `fend through vthe shaft: 138, bevel gearslfl,134,shaft 132, arm 180, ancliod 1281novingthe bell crank clock- Wise so thetits pinlroller' 1.22 lies in thepath, or'the cem 1 2 0 .1A Thns thecablev189iserves as a 'ineans for determining. Whether or not thepovver-operted dischgJ-ge .Chute mech' nism shellbe operated, I f .l

thereby opens the threefway vWater vlve 1921:` to 'permit the Water Vto oW vinto the Vmixing' drum with theaggregete.

elevated position,.ithe y'pinx116 .onthe arm 99 l engages lever118 andthereby moves thelink, `7 0fto theright, etsshowninfFig.l 3,101 tothe left, as shown milliers- 7 and9,' therebyfoscillajtingv the shzift 60 connterc'lock'wise and disi engaging the clutch in the honsin-g i12., f Dis- V engagement of the clutch 42 results in the disconnection ofthe power tothe charging skip elevating mechanism.

`-The1pitch oftheworm 8 6 and Worm Wheel j issiich that itiis nonfreversiblegthat is, thewveight of theskip end its 'contentsrvill not rotatethewormsha'ftl andthe ship is thus firmly held initsrised position. It

`is thus necessary to repplypoyver tothe Worm ina reverse directlon'in order tolo'Wer the engagement: The drive gvvill then 1 be? fromvment-vvtih thelcamf218 and the bell crank Yrenches its most.

' "witness-5 skip. vThis islncmy )implished'by 'oscilltingthef:v 'i

shaft 60'c'ounterclockyvisje (Figsk-65and' k9) by manually vlowering the link 66, thereby throwing'.v the friction clutch 4 8-5250lintoz and tlnisdri'ves the viormf6in a direction reverse to' that..whe11. rven throughithe f Clutch '42 and; will '.thselowerfthe" @berging skip. -As the chargingiskipfbegins to be lo` W- -j,. i'

ered, the pin-roller 216'isfreedfrom engage-1;

underthe influence ofthe spring 212therebyg 'f to shnto thelthiee-Wy'vvetenvalve, -1 u During' the lowering operetion,` thepin roller122 Will,fof fcourse, be helduoiit'ofthe y l l so thatgtheA discharge 'chiitejwillfnot be op SeCuli'ebyLetterS Patentsf, f

ehargingfskip, meansorfpositivelygfraijsingjff;V p Yand lowering saidSliip,:saidmeans including V@driving Pinion;'showenOperetddischarse chute,a cam on lseid pinion, sindmensjnctua-jgv ated sadfcam-tocontroltheoperatonof i r said dischargefchnte.yf g2. In a Vmachine of'the-classdesoribedythef combination of "mixingL drnm",;'e chargingA skip, means for positively rnisijng end lowfv ering said skip, saidmeensjinolnding a dri v. j Y ing Vpinion; atpoyverj operated. dischargej chute, a cam o n said pinion,` means actuated.

disohargechute fromdischarging to non-dis,

@harsisnositonaemmenefOr-rendering; f y 'gl seid'flast-named meensinoperfajtivewhen discharge. chutey is innonfdiseh r tion.

operating. said linkage.

combination mixing drum, 2t pivoted charging skip, pivotellymountedarms QI'. positively ,raising and lowering seid clungv sof . as path of com p1ate120-byfthespring 147,' 1 Y 1. Inga machine-,of the; clessdeso l 11b b :yfsaid cam to, canse they operationof sai-d combination 'of afmininglgdriinna;pivotedg Q 4eherging ship ,jpiyotellyginounted ermsfforV i positively raising and lofvvering. seid o herg! Y ine-Skin@ 0m11.911e0eG-0.Sdarme valvel i for@ COetrOl-lnspfh edHSSnpf Wate 110i' zs'aid'rdrum. linkage forrlopemng si@ weve, i and. y-ieldabl'e means actuated bysnid ca m'y for ing skip, a cam on one of said arms, a valve for controlling the admission ol water to said drum, yieldable means actuated by said cam for opening said valve, and resilient means for closing said valve.

5. In a concrete mixer, the combination of a mixing drum, a charging skip pivoted relative to said drum, a pivotally-mounted skip raising arm having its end attached to said skip by a lost motion link connection, an irreversible worm and worm wheel for swinging said arm, a power drive shaft, a clutch for operatively connecting said power drive shaft with said worm, and means for disengaging said clutch after said arm reaches a predetermined position, said means including a lever operated by said arm.

6. In a machine of the class described, a discharge chute, mechanism for moving said discharge chute from charging to non-dis charging position, power means for actuating said mechanism, a manually operable lever for controlling said means, a charging skip, and means, operated as an incident to the movement of said charging skipto a predetermined position, to control the operation of said power means, comprising a lever adapted to be moved by said skip, a spring for holding said lever in normal inoperative position, and a lost motion connection between said lever and said mechanism whereby said lever will be moved into operative position when said discharge chute is in discharging position.

7. In a machine of the class described, a discharge chute, mechanism for operating said discharge chute, power means lor actuating said mechanism, a manually operable lever for controlling said means, a charging skip, and means, operated as an incident to the movement of said charging skip, to control the operation of said power means, comprising a cam operated when said skip is operated, a. follower, a spring for holding said follower out of the path of the cam, and a flexible connection between said follower and said mechanism whereby said follower will be moved into the path of said cam when said discharge chute is in discharging position.

8. In a machine of the class described, the combination of a mixing drum, a pivoted. charging skip, means for positively raising and lowering said skip, said means including a driving shaft and pinion; a. power operated discharge chute, and means movable with said driving shaft to control the operation of said discharge chute.

9. In a machine of the class described, the combination of a mixing drum, a pivoted charging skip, pivotally mounted arms for positively raising and lowering said charging skip, a valve for controlling the admission of water to said drum, a linkage for operating said valve, and yieldable means for operating said linkage, said yieldable means being actuated by the movement of one of said arms.

In witness whereof I hereunto subscribe my name this 8th day of J une, 1928.

CHARLES J. VEBER.

IUS

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