US1903416A - Concrete mixing apparatus - Google Patents

Description

A ril 4, 1933. R. F. LINDOW CONCRETE MIXING APPARATUS 2 Sheets-Sheet 1 Filed Dec. 10, 1930 dwwmq a April 1933. R. F. Lmnow 1,903,416

CONCRETE MIXING APPARATUS Filed Dec. 10, 1930 2 Sheets-Sheet 2 nunorri r. Lmnow, or MILWAUKEE, WISCONSIN, ASSIGNO/BQTO' mm BELT 1,

Patented Apr. 4, 1933 V or MILWAUKEE, Wiscons n, A oonrom'rron or wrscousm, V

" comm n mrxme humerus Application flle'd ibeeember 10, 1930. Serial K055013197. 1

This invention'relates toxconcrete mixing apparatus and more particularly to apparatus of this character whichfcomprisestWo-or more mixing machines operated in tandem, and has for its principal objectito provide an efficient means in the form ofanauxiliary chute for transferring thepartially mixed concrete from the usual discharge chute of one mixer into the charging skip of the:adjacent mixer. i

A further object of the invention is toprovide an apparatus of this character which.

will be simple in construction, comparatively inexpensive to manufacture and which may be readily incorporated into new'machine's or with equal facility attached to mixers already in use. 1 v w i With the above and other objects in View which willjappear as thedescriptionipro. ceeds, the inventionconsists inhthe novel details of construction and; combinations of parts more fully. hereinafter disclosed and particularly pointed out in theqappended claims. a F 1 Referring to the accompanying drawings forming apart of this specification in which like reference characters designate like parts in all the Views: 1

Figure 1 is a diagrammatic side elevational view of a portion of two concrete mix ers of a well known paving type operated in tandem, one of which is provided with an auxiliary discharge chute constructed and arranged in accordance with the present invention; 1

Figure 2 is a fragmentary end elevational View of the mixer shown in Figure l which is provided with the said auxiliary chute; and

Figure 3 is a fragmentary side elevational view of the said mixer illustrating the auxiliary chute in its nonreceiving position.

Referring more particularly to the said drawings the numerals .5 and 6 indicate gen-j erally a pair of concrete mixers ofthe well known paving type positioned to operate in tandem in accordance with recently developed practice along this line, whereby increased production of completely mixed conskill'ed in the art. l" i a The mixer 5 is provided with the usual crete secured as is-well understood those" charging skip, not shown, and with-the frame work 7, mixing drum or receptac1e-8and dischargechute 9 all of" which are ofthe ordinary and well known construction. The said mixer 5 may be provided with the usual bucket and'boom distributing apparatus but this is preferably omitted since in the present method of operationit is not-necessary and if present must be swung out of the way. The mixer 6, is likewise of ordina'ry'construction, having the usual mixing drumg discharge chute and bucket and'b'oom distributing apparatus, not shown, and the usual charging skip 10 which is adapted to' be raisedand lowered in order toele-vate materials into the drum in the well known man'- ner. a

tomary to chargethe cement, aggregates and water into the drum of the first mixer inthe usual manner where they are partially mixed for a period of approximately one half the total time required to produce the complete mix. At the end of'this'reduc'ed mixing pe riod the partially mixed concrete is dis charged from the drum of the first mixer into the skip of the second mixer and elevated thereby into the drum of the second mixer;

where the-mixing period is completed, after which the completely. mixed concrete is'dis' charged into the distributing apparatus] of the second mixer and distributed thereby in the usual manner. This methodof operation requires that thecharging skip of the=second mixer when: lowered occupy a position where it will receive the partially mixed ,con-. crete discharged into the discharge chute of the first mixer. Because of certain structural dimensions, which cannot be well changed in present mixers of 'the'pavin'g; type, it is not practical to position the two mixers su-flicient-z' ly close together for the: skip ofath'eisecond mixer to occupy this required position with relation to the discharge chuterofzathe first mixer without interference with the said chute during the'swingv' hof thev skip,1 .and it is therefore necessary to provide an addition a I In the tandemmethod of operation-it is cusbe supported by the side arms .or plates 12 which are pivoted as at 13 in frame members or brackets lt which are rigidly secured to 10 said auxiliary chute 11" is adapted to occupy either the position illustrated in Figure 1, which is its operative position, or the position illustrated in Figure 3 whichis its non-re ceiving position and towhich position it must be moved in order topermit of the elevation of the skip 10 of the second" mixer as will be readily .apparent from Figure 1. In other words, when the skip 10-is elevated its outermost edge must swing through the arc of a when in the position shown in Figure 1 and in order to avoid contact of the parts the said auxiliary chute should be automatically 2,5 moved from the position shown in to that shown in Figure 3.

In the present instance this automatic movement is accomplished through the mediumof a pair of arms 15, secured to the members 12 below the pivot 13, each of which carries at its innermost end a suitable weight '16. The said weights are of such value that they will more than counterbalance the weight of the auxiliary chute 11 and its associated parts so that the latter will always be urged toward the position illustrated in Figure 3-through the medium of the said weights. In order to overcome the action of theseweights and to move the auxiliary chute from its, non-receiving to its receiving positionshownin' Figure 1, the arms 15 are extended outwardly into the'pathof the descending skip 10 and are preferably provided with suitable plates or shoes 17 which are engaged by theedge portions of the skip 10 in its descent-as will be readily understood. The weightofthe .said skip is, of course, sufficie'nt to overcome the action of the weights 16 and the parts will therefore be automatically moved through the medium of the descending skip from the position shown in Figure 3 to thatshown in Figure 1 where the auxiliary chute 11 is in-position to receive the partially mixed concrete from the dis- Figure 1 intothe skip 10. I

. After such transfer of the charge has been eifected, as the skip 10 is elevated to discharge the partially mixed concretezinto' the drum illustrated and described, it is obvious that 5'those1skilled in the "art may vary the details the'framework 7 "of the first mixer" 5. *The circle which intersects the auxiliary chute 11' charge chute 9 and insure that'it is deposited.

of construction as well as the precise arrangement of parts without departing from the spirit of the invention, and therefore it is not wished to be limited to the above disclosure except as may be required by the claims.

Whatis claimed is: I 1. 'In a concrete mixer, the combination with a frame, a mixing receptacle and a discharge chute, of an auxiliary chute piv ot'ally mounted on said framefor oscillatory movement to and from a position in which itmay receive concrete from said discharge "chute; and aweighted arm connected with said auxiliary chute, adapted to normally urge said auxiliary chute toward its nonreceiving position, said armhaving an extension to which a force maybe applied to move said auxiliary chute to its receiving position. I v 2. The combination with a plurality of {55 concrete'mixers', one of which is provided with a swinging drum-charging skip and another of which has a drum-discharging chute, of a movable auxiliary chute for receiving concrete from said discharge chute. 99 and discharging it into saidcharging skip, said auxiliary chute having meansengageable'by said charging skip for moving it from a non-receiving to a receiving, position relative to said discharge chute. '3. The combination with a plurality of concrete mixers, one of which is provided with a swinging drum-charging skip and another of which has a drum-discharging chute, of a movable auxiliary chute for receiving concrete from said discharge chute and discharging it into said charging skip, said auxiliary chute having means engageable by said charging skip for moving it from a non-receiving to a'receiving position relative to said discharge chute; and means for moving saidauxiliary' chute to non-receiving position when said first named means is disengaged by said'charging skip. Y

.110 4. The combination with a pair of concrete mixers disposed in tandem, one of which is provided with a swinging drumcharging skip and the other of which has a drum-discharging chute, of a pivoted aux iliary chute for receiving concrete from said discharge chute and discharging it into said charging skip; means connected to said auxiliary chute, engageable by said skip as 7120 it is lowered, for moving said auxiliary chute from a non-receivingto a receiving position relative to said discharge chute; and weights for moving said auxiliary chute back to non-receiving position as said skip is raised. 7 p Intestimony whereof I aflix my" signature.

RUDOLPH F. LINDOW.

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