US2013360A - Transit concrete mixer - Google Patents

Description

Sept. 3, 1935. H, P. PARIS TRANSIT CONCRETE MIXER 6 Sheets-Sheet :1

Filed Nov. 13, 1928 lNVENTOR o Hug/zRPa rI'S BY 6 ATTORNEY Sept. 3, 1935. P A 2,013,360

TRANSIT CONCRETE MIXER Filed Nov. 15, 1928 6 Sheets-Sheet 2 lNVENTOR ATTO EY J Sept. 3, 1935. H, p PARls 2,013,360

TRANS IT CONCRETE MIXER Filed Nov. 13, 1928 6Sheets Sheet 3 INVENTOR VZ/g'fi RPar/S ATTbRNEY Sept. 3, 1935. H R PAR- 2,013,360

TRANSIT CONCRETE MIXER Filed Nov. 15; 1928 6 Sheets-Sheet 4 iNVENTOR fiag Par/s ATTOR EY Sept. 3, 1935. H PA 2,013,360

TRANSIT CONCRETE MIXER Filed Nov. 13, 1928 6 Sheets-Sheet 5 INVENTOR 2 Z ATTORNEY Sept. 3, 1935. P PARIS 2,013,360

TRANSIT CONCRETE MIXER Filed Nov. 13, 1928 6 Sheets-Sheet 6 6 a 0mm m 1 r Y 8 mad .M. s: 2 MA A I \r. 1 W Y atented Sept. 3, 19 35 iTED s'l' 'rss PATENT OFFICE ments, to Paris Transit Mixer Seattle, Wash, a corporation oi Washington Application November 13, 1928, Serial No. 319,067

3 Claims.

This invention relates to concrete mixers, more particularly of the transit type, and aims primarily to provide a concrete mixer wherein the aggregates are intimately intermixed by slump action both laterally and longitudinally whereby a. uniform mix is obtained and the resultant product has a high breaking strength.

I contemplated by the present invention is a concrete mixer embodying a supporting frame; a voluble wobbling mixing shell cradled upon said frame; means for driving said shell; means for charging said shell; means for dumping the mix; and'water supply means for the aggregates, all of which are important objects of the invention and are to be correlated in the broad aim of enhancing the emciency of the mixer for general use.

The above, and additional objects which will hereinafter be more specifically treated, are attained by such means as are shown in the accompanying drawings, described in the following specification and then more clearly pointed out in the claims, which are appended hereto,

' and form a part of this application.

25 With reference to the drawings in which there are illustrated several embodiments of the invention, and throughout the several views of which like characters of reference designate similar parts.

Figure 1 is a side elevation of a transit concrete mixer comprehended by the present invention.

Fig. 2 is an end elevation of the same, certain parts being in section and certain other parts broken away for clarity of illustration.

Fig. 3 is a fragmentary plan view thereof.

Fig. 4 is a diagrammatic transverse view of the mixing shell illustrating the manner of reinforcing same. t

Fig. 5 is a plan view of a slightly modified t of transit mixer.

Fig. 6 is a vertical transverse section taken through 6-4 of Fig. 5.

Fig. 7 is a side elevation thereof.

Fig. 8 is a diagrammatic end view of the samein wherein approximately two-thirds of thevolubroken away and certain other parts being shown in section.

Before taking up the detailed description of the drawings, a general exposition of the specific purposes, features, and functions of the transit 5 concrete mixer evolved by the present invention will be undertaken. Heretofore, considerable difflculty has been experienced inkeeping the interior of concrete mixer shells clear of hardened concrete, due primarily to the numerous bafile 10 plates commonly employed and required in such shells to distribute and mix the aggregate, which baflle plates also function to retard and'impede dumping of the mixed aggregates. Further objections and disadvantages of the transit mixture heretofore in use are: the length of their mixing shells and their mode of construction, which entailed and necessitated the employment .of trucks having excessively long wheel bases; rendered the charging of such mixing shells extremely dinicult; permitted utilization of approximately only one-third of the volumetric capacity of the mixing shells; precluded proper and efilcient distribution of water to the aggregates; lacked adaptability or capability for mixing still or relatively dry concrete due to the fact that the same becomes tacky and lumpy and adheres to the interior baffles or blades of the mixing shells thus effectually preventing clean dumping of the mixed aggregates; and the fact that the maximum charges of said mixing shells are too small for all practical and profitable purposes. Therefore, a primary object of this invention is to obviate the objections and disadvantages of the transit mixers now in general use. Another primary object is the provision of a transit mixer of novel shape and construction, wherein no baflle plates, blades or other interior obstructions of any kind are employed, which fact permits and insures of a clean and complete discharge of the mixed aggregates and precludes possibility or probability of any corrosion occurring within the mixing shell. Another primary object is the provision of a compact and relatively light transit mixer which may be mounted'upon a truck having a relatively short wheel base thus materially increasing the maneuvering range and effectiveness of the unit. Another primary objectis the provision of a transit mixer which may be rapidly and readily charged with aggregates and wherefrom the mixed aggregates are expeditiously and readily dumped without the use of complicated and costly hoisting devices. Another primary object is to provide a transit mixer aggregates.

metric capacity of its mixing shell is efiectively utilized during mixing of the aggregates, thus materially increasing the size of the charges in each and every instance and in consequence thereof the earningcapacity of 'the unit. Another primary object is the provision of a transit mixer especially designed and readily adaptable for mixing relatively dry aggregates and for completely and rapidly discharging the same when mixed. Another primary object is the provision of a transit mixer wherein the water is properly and uniformly distributed or sprayed upon the Another primary object is the pro-. vision of a transit mixer wherein the aggregates due to the shape of the mixing shell and its rotating and wobbling movements are intimately intermixed in a manner which approximates very closely the mixing of aggregates by the shovel method.

Beginning the more detailed description by reference to the accompanying drawings, the numeral ll designates atransversely disposed mixing shell or chamber, which is polygonal in cross-section, and which for purposes of the present disclosure is preferably illustrated and hereinafter described as being of hexagonal formation. The shell II is closed at its ends and to provide for charging of the same with aggregates and for the discharging or dumping the mix I prefer to utilize one of the sides of such shell as a door i2, which is hinged as at E3 and when closed is secured by latches l6. A small gate l6 slidably disposed in guides I7 is mounted upon the door IE to permit of the discharge of relatively small quantities of the mixed aggregates, asis often found desirable.

Rigidly secured and eccentrically mounted upon the ends of the mixing shell i l are annular journals orraceways l9 and 20, respectively, to

which are similarly secured annular sprocket Wheels 2| and32, respectively, it being here noted 7 that the axis of the annular journal I3 is disposed below the axis of the mixing shell, while the axis of the annular journal 20 is disposed above the axis of the mixing shell for a purpose hereinafter set forth. The journals with their correlated sprockets are also disposed in spaced relation to their respective ends of the shell H by a series of spacers or bosses 24, which are of different lengths, so that such journals and their sprockets are maintained in parallel relation with respect to each other and in perpen- Y dicular relation to the axis of rotation of the shell II. The journals l9 and 20-are cradled or supported for rotation upon rollers '25 mounted ,upon a supplemental frame 21, which is provided with a series of rollers 29 operating in channel guides 30 secured to a truck frame 32. Rigidly secured to one side of the supplemental frame 21 is a rack 33, with which meshes a pinion 34 journalled upon the truck frame 32 for rotation by a crank handle 35. Obviously, when the crank 35 is turned in a clockwise direction the supplemental-frame'fl is moved rearwardly upon the truck frame 32, to the dumping position indicated position or at any intermediate point between a fully advanced or fully retracted position, as

aoiaseo will be manifest and apparent by referring to Fig. 1, so that the supplemental frame 21 '.may be locked to the truck frame 32 during mixing operations, or if for any reason may be locked to the latter in any intermediate position between the "mixing position and dumping position.

'The sprocket wheels 2i and 22 are connected by sprocket chains 40 to sprocket pinions 4|,

which latter may be driven in any convenient manner. In the present instance, however, I have shown a shaft 43 adapted to be optionally engaged with -a driving shaft 66 of any standard type of-power take-off. A bevel pinion 45 and a bevelgear B6 transfer the power from the shaft 43 to. diiferential gearing 43, which in turn imparts power to jack-shafts 50 and i, to the outer ends of which are rigidly secured the sprocket pinions 5i. By interposing the differential gearing 48 between the sprocket pinions Bi and the versely disposed frame 52 rigidly secured to the forward end of the supplemental frame 21, substantially in the manner illustrated in Figs. 1 and 3.

A hand brake 53, of any standard type, mounted upon the jack-shaft 50 and attached as at 55, in any well known manner to the frame 52, is provided for the purpose of positively holding the mixing shell II in position during dumping operations.

Longitudinally disposed water storage tanks 55 are mounted upon the supplemental frame 27 in spaced relation to the ends of the mixing shell H, as shown more clearly in Fig. 2, said tanks 55-being interconnected by a common discharge pipe or conduit 56, which extends longitudinally through the mixing shell II and is provided with a series of aligned apertures 51 spaced at intervals throughout its length. Mounted for oscillative movement upon the discharge pipe 56 is an oscillative sleeve or valve pipe 58 having a series of aligned apertures 59, which register upon occasion with the apertures 51 of the pipe 56. It will be noted by referring to Fig. 2 that the axes of the pipes 56 and 58 are co-extensive with the axis of rotation of the mixing shell II and in consequence thereof, such pipes are not affected by the rotation of said shell.

To reinforce the interior of the mixing shell II I have found it desirable in some instances to provide a series of tie rods 6i,,which are rigidly secured at their terminals to the opposing flat sides of the said shell, or to one fiat side and the opposing angles of the same, substantially in the manner indicated diagrammatically in Fig. 4. These rods are disposed or distributed instaggered relation throughout. the length of the mixing shell and function to stiffen the flat sidesthereof and break up any lumps of dry aggregatestthat tend to float in the mix.

Where it is necessary to transport .and'mix a large quantity of aggregates I have found it desirable and essential to slightly modify the mixer, substantially in the manner illustratedin Figs. 5 to 8, inclusive. In this type the mixing shell Ila having a side door l2a at one end thereof is longitudinally disposed uponits correlated truck, thus making it possible to have a mixing shell of considerable length and capacity. This 101m of construction requires a tilting correlated parts may be cradled upon a laterally tilting supplemental frame 10 pivotally condisposed upon and rigidly secured to the truck frame 32. In this connection it is to be noted that the supplemental frame 10 is-superimposed upon the intermediate frame 13, as shown in Fig. 6, while the supplemental frame Illa is disposed in the same horizontal plane with the intermediate frame 13a, as is shown in Fig. 7, depending upon the individual or particular design of its correlated truck chassis,

. While any convenient hoisting means may be employed to effect lateral tilting of the supplemental frames 10 or 10a, actual experience has demonstrated that a multiple lift hydraulic jack 14 manually operable by an actuating handle 15 to be very efficient and reliable for this purpose, the base of said jack being pivotally secured to thetruck frame 32, while the upper lift member of the jack is pivotally connected and secured to the supplemental frame 18 or 18a, as indicated at 18 in Fig. 6 or at 16a in Fig. 8.

When the mixing shell lla and the supplemental frame 78 are fully elevated or tilted by the jack It to the dumping position indicated by the dotted lines in Fig. 6, gravity tends to roll or unseat the shell I la from its supporting rollers 28a, and in order to effectually and positively prevent unseating of the shell I provide a roller 18 for each end of the latter, which rollers are mounted upon bearings 19 rigidly secured upon the ends of the supplemental frame 10 between the supporting rollers 25a, substantially in the manner illustrated in Fig. 6, and are adapted and designed to engage and roll within the inner surfaces of the annular journals |9a and 28a, so that during tilting movements of the shell II a and frame 18 by the jack 14, such shell is maintained at all times by the rollers 78 in cradled relation within its correlated supporting rollers 25a, as will be manifest and apparent. The jack 14 also functions as a stop to limit the tilting movement of the frame 78 and thus prevents the weight of the shell and the aggregates from overturning said frame, the supplemental frame 18a is also equipped in a similar manner, as above described for the frame 18, so that when the same is tilted as illustrated in Fig. 8, its correlated mixer Ila will not become unseated.

In both forms of transit mixers, hereinbefore shown and described, it is desirable to control the supply of water to the mixing shells or i la from the driver's seat, and in the transversely disposed type of mixing shell shown in Figs. 1 to 3, inclusive, the numeral 80 designates a control rod, which extends rearwardly from the operator's cab, not shown, and at its rear end is connected to one arm of a bell crank lever 8| pivotally mounted upon the truck frame 32, the other arm of which engages or abuts the lower end of a push rod 82 pivotally connected at its opposite or upper end to an oscillative arm 83 rigidly secured to one end of the oscillative sleeve or valve pipe 58, whereby a pull upon the control rod 88 exerts an upward thrust upon the push rod 82 and its correlated arm 83, causing circumferential movement of the sleeve 58 upon the pipe 56, so that the apertures 59 are brought into means, consequently, the mixing shell with its registration with the apertures 51 to spray the aggregates with the necessary quantity of water during mixing operations. Upon retraction of the control rod 88 a tension' spring 84 connected at one end to the periphery of the sleeve 58 and at its other end to the water tank 55 serves and functions thereat to effect reverse circumferential movement of the sleeve 58 and thus move the apertures 59 out of registration with the apertures 51, thereby shutting off the water. When the supplemental frame 21 is moved rearwardly to dump the load the lower end of the push rod '82 slides off the bell crank 8|, but upon return of the frame 21 to a normal or mixing position the pushrod 82 is again brought into engagement or abutment with the bell crank 8| it will therefore be apparent that by fabricating these parts in the manner herein shown and described, that such construction readily permits of independent movement of the supplemental frame 21 and its correlated parts relative to the control rod 80 and its bell crank 8|;

In the longitudinally disposed type of transit mixer disclosed in Fig. 7 a cable 85 extends rearwardly from the operators cab, not shown, through the pivot pins Ila around suitably disposed pulleys 85' and thence upwardly therefrom to the operating handle of a water control valve 86 connected to the outlet of a water storage tank 55a. A tension spring 8'! functions to normally close the valve 86 and retract the cable 85.

In some instances and under certain conditions it is desirable to dump the mixed aggregates at some distance from the truck, and for this purpose I employ a chute 90 illustrated in Figs. 7 and 8, which chute may be effectively employed with either the end or side dumping type of mixer. The chute 98 is fabricated in any desired length and at its upper or inner end has a width equal to the door l2a, whcrefrom it converges outwardly and downwardly in the manner shown in Fig. 7,

said chute being preferably supported or suspended by rapidly and readily detachable means,

such as chains 9|, to a bar or rod 92 mounted for pivotal movement, at a point substantially midway its length, upon a pin 93 secured to a longitudinally disposed member 94 fixedly mount-- ed upon one side of the supplemental frame 10. This method of mounting the chute 9!] permits turning the same in any direction to thereby facilitate and expedite dumping of the concrete in the desired location. a

In operation a transit mixer of either the end or side dump type, hereinbefore described, is positioned under a batching chute with its door l2 or |2a open and uppermost, this permits of rapid and ready charging of the mixing shell II or Ila with the desired quantity and proportion of aggregates, following which the door l2 or IM- is closed and clamped. The water storage tanks 55 or 55:; are then filled and the transit mixer started for its destination. At a proper distance from its point of delivery the shafts 43 and 44 are interconnected by the clutch mechanism disclosed in Fig. 3, or by any other convenient and suitable means, to thereby impart rotative and wobbling movement to the mixing shell I or I la and the necessary quantity of water is sprayed upon the aggregates. As the. mixing shell II or I la rotates and wobbles the flat sides of the same function due to rotative movement to carry the aggregates on the bottom upwardly and dump or slump such aggregates upon and into the upper aggregates, and coincidentally and concurrently therewith the endwise wobbling movement of such shell produced by the eccentrically in combination with the rotative movement of the particular shell causes slumping of the aggreapparent. To facilitate and expedite a complete gates from the ends of such shell to the center of same, whereby the entire charge of aggregates in the shell II or a are thoroughly and intimately intermixed. Obviously, therefore, the combined rotative and wobbling movements of the shell II or IIa produces a thorough intermixture of the aggregatesboth in lateral and longitudinal directions.

In the end dump type of transit mixer, when it is desired to dump the mix, the rotating mixing shell I I is stopped with the door I2 in the dumping position, substantially as indicated in Fig. 1, by applying the brake 53 which also functions to positively hold the shell in such position during dumping, whereupon the shafts 43 and M are disconnected, the movable supplemental frame 21 carrying the mixing shell and correlated parts is then moved rearwardly, from the full line position to the dotted line position shown in Fig. 1.

' secured, and due to the elimination of all bailie plates nothing will stick to the inner surfaces of the shell to cause corrosion. However, if it is desired to discharge only a small amount of the intermixed aggregates, the small or auxiliary door I6 is utilized for this purpose, and being mounted upon the large door I2 will operate from the same dumping position.

Actual experience has shown and demonstrated the advisability and necessity of locating the mixing shell II somewhat forwardly of the rear wheels of the truck, during loading and mixing operations, which fact necessitates the rearward movement of such shell for'dumping, and in this connection it may be well to state that any tendency for the mixing shell II and its correlated movable supplemental frame 21 to overbalance while in a rearward or dumping position is effectually and definitely prevented by the supplemental frame rollers 29 abutting the upper sides of their guide channels 30 rigidly secured to the truck frame 32. v

In the side dump type of transit mixer, the side door In is hinged as at I3a and is secured in a closed position by latches I 40, and when it is desired to dump the mix, the mixing shell is stopped and held in the position indicated in full lines in Fig. '1, following which the chute 90 is attached with its inner end disposed contiguous to the door I2a, which is-then opened .to discharge the major portion of the mixed aggregates into the chute 90, however, to eflect complete discharge of the contents of the shell, the jack" is actuated to elevatethe supplemental frame or 10a with its mixing shell Ila, whereby the slope or angularity of the lowermost flat wall of the shell is increased resulting in the entire evacuation of the latter, as will be manifest and and clean discharge of themixing shell Ila, particularly where the door I2a occupies only a portion of one of the fiat sides'of said shell,

as shown in Fig. 7, I have found it expedient in practice to locate the rear pivot pin 1Ia adjacent the chute 90 in a plane below that of the forward pivot pin 1Ia, which form of construction perposed mixingshell, hexagonal in cross-section,

and especially designed for end dumping, said shell having eccentrically mounted raceways IOI rigidly secured upon the ends thereof for rotation upon rollers I02 mounted upon the ends of a similarly disposed supplemental frame I03, which latter is tiltably mounted at its rear end upon the rear end of a truck chassis I04, whereby the mixing shell I00 and supplemental frame I03 may be tilted to the dumping position shown in Fig. 9. Movement into dumping position is effected in any suitable manner, and I have herein shown a cable I05 which may be connected to any suitable vertical hoist, not shown, in a manner common in the dump truck art. The pivot connection betweenthe supplemental frame I03 and truck chassis I00 may be of any type found suitable in the dump truck art, but, in the present instance the frame I03 is provided with depending brackets I06 and the chassis I04 is provided -with rearwardly extending brackets I01 having laterally extending gudgeons I08 which are journalled for oscillative movement within the lower ends of the depending'brackets I06, as shown more clearly in Figs. 10, 11' and 12, the pivotal mounting herein shown and described is merely illustrative as any pivotal mounting may be employed which is found suitable.

A longitudinally disposed shaft I09 connected at its forward end to any standard type of power take-off, not shown, is journalled at its rear end within an extension IIO of one of the brackets I01, whereat it is interconnected by bevel gearing I I I to a laterally disposed shaft I I2 journalled for rotation at its inner end within the extension H0 and at its outer end is journalled within and extends through the adjacent bracket I01 and gudgeon I08. Fixedly secured to the outer' terminal of the shaft H2 is a sprocket wheel II3 connected by a sprocket chain II I to a sprocket wheel H5 having a bevel pinion IIG formedintegral therewith, or otherwise rigidly secured thereto, said sprocket wheel I I5 and bevel pinion I I6 being fixedly secured to a stub shaft II I journalled for rotation within an extension IIB, .of the adjacent bracket I01.

Meshing with the bevel pinion us is a bevel gear H9 which is fixedly secured upon the rear terminal of a shaft I20 longitudinally disposed upon one side of the supplemental frame I03 and journalled for rotation adjacent its ends within brackets IZI fixedly secured to the side of said ing rollers I02 with truncated conical faces I25 which normally abut and roll upon a bevelled por- -III tion or face I26 formed integral with or otherwise rigidly secured to the rear annular sprocket wheel I24, substantially in the manner illustrated in Fig. 9. Further, to similarly prevent unseating of the forward end of the shell I from its front supporting rollers I02 I provide a roller I21 which is mounted upon the front end of the supplemental frame I03 and is adapted to engage and roll upon the inner surface of the front raceway "II, which in the present instance is of annular formation, and identical in construction to the raceways I9 and 20 hereinbefore described, while the rear raceway IOI in the present instance, is fabricated in the form of a cylindrical throat having a coned outer end I28 provided with a discharge aperture I29 adapted to be closed by a door I30 during mixing operations.

To prevent lodgement of the mixed aggregates I00 withthe aggregates is provided in one of the flat sides thereof, said opening being normally closed by a door I33 slidably mounted in guides I34 formed upon said shell.

A water storage tank I35 is laterally disposed and suitably supported upon the forward end of the supplemental frame I03 with its outlet connected to the suction side of a rotary pump I36. which is also mounted upon said frame with its axis in alignment with the axis of the shaft I20. A pipe I3'I connected at one end to the discharge of the pump I36 extends upwardly therefrom and at its upper end projects within the mixing shell I00 and is provided thcreat with a nozzle I38. said upper end being adapted to pass through the axis of rotation of said shell and in consequence is not affected by the rot-ative movements of the same. A clutch I39 is provided to interconnect the shaft I20 with the pump I36 to drive the latter whereby the necessary quantity of water is sprayed upon the aggregates during mixing operations.

In operation the herein described transit mixer is placed under a batching chute with the mixing shell I00 in a horizontal disposed position with its charging door I33 open and uppermost and its dumping door I30 closed. Upon charging the shell I00 with the desired quantity of aggregates the door I33 is closed and the water tank I35 filled, following which the transit mixer is started for its point of delivery. Upon nearing suchi point the operator connects the shaft I09 with the power plant of the truck, to thereby impart rotative movement to the mixing shell I00, through the media of the bevel and sprocket gear mechanism hereinbefore described, which rotative movement also causes end to end wobbling movement of the shell due to its eccentric mounting, the operator then connects the shaft I20 with the pump I36 through the medium of the clutch I39 to spray the necessary quantity of water upon the aggregates. The action produced upon the aggregates by the aforesaid rotative and wobbling movements is identical to that described for the shell II, and upon the point of delivery being reached and after completion of the mixing operation the supplemental frame I03 and its correlated mixing shell I00 is tilted to the dumping position shown in Fig. 9, whereupon the door I30 is opened and the mixed aggregates dumped out. It is to be here noted that the mode of construction of the transit mixer above described readily permits of the rotation of the mixing shell I00 in a dumping position, or in a position of rest, or in any intermediate position.

In the foregoing description and in the accompanying drawings I have electedto describe and illustrate the mixing shells as being hexagonal in cross-section, but, it is to' be understood that such shells maybe fabricated with any number of fiat sides. It is therefore the primary and principal feature of this invention to provide an eccentrically mounted mixing shell, which is polygonal in cross-section, whereby rotation of such shell will produce a slumping action oL-tfle aggregates in a crosswise direction due to the flat sides and the eccentric mounting of the shell will cause the same to wobble and produce a slumping action of the aggregates from the ends of the shell to the center of the same. It will thus be readily apparent and obvious that a thorough intermixture of the aggregates is secured with- --.out the aid of baliie plates or any other similar obstructions upon the interior walls of the mixing shell.

While I have herein shown and described the invention with sufiicient detail to enable those skilled in the art to which it pertains to understand the mode of construction and the principles involved, it is to be understood that there is no intentional limitation herein to the specific form and precise details of construction shown and described, except as expressly defined by the appended claims, and that various modifications of the same may be resorted to without departing from the spirit of the invention or the benefits derivable therefrom. It is also to be understood that certain features of the invention herein disclosed may be employed in and with other combinations than those shown and described.

What I claim as my invention and desire to secure by Letters Patent is:

1. In combination with a concrete mixer, of an axially elongated eccentrically mounted voluble mixing shell-having closed ends and a polygonal cross-section, one of the sides of said shell forming a door therefor. an auxiliary door on said first mentioned door, and means for rotating the shell.

2. In combination with a motor truck having a drivers cab, a tiltable frame mounted on the truck, a concrete mixer on the tiltable frame, a water tank and piping therefrom to the mixer and a pump interposed in the piping all carried on said tiltable frame, transmission for operating the mixer from the truck power, a shaft operated by the operation of the mixer. and a clutch for connecting said pump to said shaft.

3. In combination with a motor truck having a driver's cab. a tiltable frame mounted on the truck, a concrete mixer on the tiltable frame, a 1

water tank and piping therefrom to the mixer and a pump interposed in the piping all carried on said tiltable frame, transmission for operating the mixer from the truck power, a shaft operated by the operation of the mixer. and a clutch for connecting said pump to said shaft'operable from the driver's cab whereby the pump may be engaged with the shaft or disengaged during the transit of the truck.

HUGH P. PARIS.

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