US3612491A - Concrete holding mixer - Google Patents

Concrete holding mixer Download PDF

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Publication number
US3612491A
US3612491A US39495A US3612491DA US3612491A US 3612491 A US3612491 A US 3612491A US 39495 A US39495 A US 39495A US 3612491D A US3612491D A US 3612491DA US 3612491 A US3612491 A US 3612491A
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United States
Prior art keywords
concrete
drum
conveyor
hopper
frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US39495A
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English (en)
Inventor
Robert W Mckillop
William Stanis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rex Chainbelt Inc
Rexworks Inc
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Rex Chainbelt Inc
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Filing date
Publication date
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Publication of US3612491A publication Critical patent/US3612491A/en
Assigned to REXWORKS, INC., A CORP. OF DE. reassignment REXWORKS, INC., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: REXNORD INC.
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
    • B28C5/4203—Details; Accessories
    • B28C5/4234—Charge or discharge systems therefor
    • B28C5/4237—Charging, e.g. hoppers
    • B28C5/4241—Charging, e.g. hoppers having self-charging means, e.g. skips, scoops or buckets, picking up the material from the ground
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
    • B28C5/4203—Details; Accessories
    • B28C5/4234—Charge or discharge systems therefor

Definitions

  • ABSTRACT A concrete mixer is adapted for use as a temporary concrete holding drum by providing a conveyor for charging the mixer drum with premixed concrete for holding or discharge directly to the mixer discharge chute. The entire unit is transportable and the conveyor is separately demountable therefrom such that the mixer may be operated as a C011- ventional transit mixer.
  • the present invention pertains to the art of concrete delivery and placement, and more particularly to a concreteholding means for use intermediate the delivery of readymixed concrete to a construction site and its final placement.
  • the concrete-holding means includes a concrete mixer fed by a belt conveyor and adapted to receive the supply of concrete delivered to the site, such as by truck mixers, and to accommodate surges in such supply, and to simultaneously provide a discharge of concrete for final placement either continuously or intermittently, as required.
  • the supply of concrete to the location of the construction of a building or other structure is often provided by transit-type concrete mixers or, as they are more commonly known, truck mixers.
  • transit-type concrete mixers or, as they are more commonly known, truck mixers.
  • the advantages of supplying ready-mixed concrete are well known and include elimination of on-site concrete batching and storage of raw materials.
  • the rate at which concrete is being poured may, at times, exceed the delivery rate. This problem often occurs or is compounded when the truck mixers are required to be maneuvered into restricted or other difficult-to-reach positions be fore discharging the concrete. The result is, of course, delays in the final placement of concrete.
  • Truck mixers discharge concrete directly into the bucket which generally can be filled a half dozen or more times from an average capacity mixer. The truck mixer must, therefore, await the return of the bucket each time with the consequent loss of considerable truck time. On the other hand, if the truck mixers must back or otherwise move one at a time into a restricted position to unload, as is often the case, considerable pouring time may also be lost while the empty truck is leaving and the next one is moving into position to unload.
  • a concrete pump is generally fed by a relatively small hopper mounted on the unit and, as is known in the art, an uninterrupted even flow of concrete supplied to the hopper is very critical.
  • Belt conveyors are also often used to carry concrete to placement in remote areas of a job site. In this placement method, it is equally important to be able to maintain a continuous supply of concrete to the belt conveyor and to be able to halt the supply if final placement is stopped for any reason.
  • the ideal delivery-placement system would include an intermediate concrete holding means wherein the supply thereto could be made completely independently of the discharge therefrom. It is also important, as is known and disclosed in the prior art, that concrete held in place for more than short periods be mixed or agitated to maintain uniformity in the mix and avoid segregation of the ingredients.
  • U.S. Pat. No. 3,185,450 shows a mobile apparatus adapted to receive and distribute a concrete mixi
  • the apparatus includes a mixing skip feeding a belt conveyor which, in turn, discharges into a chute for final placement. Though designed primarily for mobile placement of concrete, this type of device could also be used as a stationary intermediary for the receipt of concrete from a truck mixer and the selective redistribution for placement either directly or by a bucket or other means.
  • a portion of the concrete batch plant shown in U.S. Pat. No. 3,446,487 includes a horizontal mixer fed by a belt conveyor.
  • This combination provides a disclosed ability for selective or simultaneous charging and discharging with temporary holding and mixing in the horizontal drum.
  • This mixer is designed particularly for use in a batch plant, and the elaborate concrete transfer mechanism is specifically adapted for operation as part of the batching system.
  • the horizontal mixer is, thus, not readily adaptable to operation outside the system for which it was designed. Additionally, its cost may exceed by as much as four times the cost of a mixer of the type used on a truck mixer, and its modification for limited use outside a batch plant would be economically impractical.
  • a conventional inclined axis concrete mixer provides a temporary holding and mixing station to minimize the adverse effects of unavoidable lack of coordination between the supply of ready-mixed concrete to the construction site and its final placement in the structure.
  • Concrete is supplied to the charging hopper of the mixer by a belt conveyor extending from a substantially low level at the head end of the mixer over and in closely-spaced relation to the top of the drum, and terminating over the hopper.
  • One truck mixer can discharge its full load of concrete onto the conveyor without delay and move out of the way for the following truck mixer.
  • the concrete is carried to the charging hopper of the stationary mixer, from which it is funneled into the mixer drum.
  • the concrete may be temporarily held and mixed in the drum or simultaneously discharged by opposite rotation of the drum in a known manner.
  • the conventional transportable mounting of the mixer and conveyor provides necessary portability and the conveyor is demountable therefrom such that the remaining unit can be towed by a standard tractor and operated as a transit mixer.
  • the drawing shows a side elevational view of the concrete holding mixer in its preferred embodiment mounted on a semitrailer.
  • a portable concrete holding mixer includes a conventional inclined axis concrete mixer 11 mounted on a semitrailer l2 and to which concrete is supplied by a belt conveyor 13 mounted atop the mixer 11.
  • the mixer drum 14 is a frustoconical inclined axis type supported at its forward and rearward ends for rotation about its axis.
  • the forward or head end is supported by a pedestal 15 and the rearward end by a rear upright frame member 16.
  • the pedestal l5 and upright frame member 16 are fixed, respectively, to the forward and rearward ends of a pair of longitudinal frame members 17 which are, in turn, secured to the trailer chassis 18.
  • the drum 14 is driven by an annular drum sprocket l9 fixed to the outer periphery of the drum.
  • a drive chain 20 interconnects the drum sprocket 19 and a drive sprocket 21.
  • the drive sprocket is powered through a speed reducer 22 and either a mechanical or hydraulic transmission 23 by an engine 24 mounted on the trailer chassis 18 forwardly of the pedestal 15.
  • Concrete (or a batch of concrete ingredients) is supplied to the mixer drum 14 through a charging hopper 25 disposed adjacent the open rearward end of the drum.
  • the hopper is constructed and positioned to funnel the concrete down and into the interior of the drum.
  • the interior drum wall is provided with a spiral mixing and discharge blade 26. When the drum is rotated in one direction, the blade carries the concrete to the closed head end of the drum, and rotation of the drum in the opposite direction moves the concrete upwardly and rearwardly where it is discharged over the lip 27 defining the open end of the drum.
  • a discharge chute 28 is attached by means of a vertical axis pivot 40 to the upright frame member 16 such that its upper receiving end is always positioned directly below the discharge hopper 39 and the lip 27 of the drum for the receipt of concrete discharged therefrom.
  • the chute 28 directs the concrete by gravity either to final placement or to a receiving means such as a bucket B by which the concrete may be moved to a location not accessible for direct placement from a mixer.
  • the belt conveyor 13 is of common construction and includes a pair of siderails 29 between and at the ends of which are mounted the head and tail pulleys 30 and 31, respectively.
  • a conveyor belt 32 is trained about the pulleys 30 and 31 and operates therebetween over a series of spaced troughing idlers (not shown) in a manner well known in the art.
  • the head pulley 30 is used to drive the belt and may, in turn, be driven by the engine 24 or a separate power source in a conventional manner. It is also known to drive the belt through the tail pulley 31.
  • the head pulley 30 is positioned over the charging hopper 25 and the conveyor extends forwardly over the top of the mixer 11 and curves downwardly over the head end of the drum l4 and engine 24.
  • the forward charging end of the conveyor 13 lies just forwardly of the trailer chassis l8 and is provided with a receiving hopper 33 disposed sufficiently low to be reached by the chute C of a truck mixer or the like.
  • the conveyor 13 is secured in position at its head end by attachment of the side rails 29 to extensions 34 of the upright frame members 16 on either side of the drum. Similar vertical extensions 35 extending upwardly from the pedestal l5 rigidly support the opposite end of the conveyor.
  • the conveyor is preferably demountably secured to the extensions 34 and 35 for reasons which will be set forth below.
  • the semitrailer 12 is provided with tandem dual wheels 36 at the rear and a kingpin or fifth wheel 37 at the forward end for towing attachment to a truck tractor (not shown).
  • the forward end of the trailer may also be provided with suitable legs 38 or other means of stabilization and support when disconnected from the towing vehicle.
  • the portable concrete-holding mixer 10 is towed to a construction site and positioned where the receiving hopper 33 can be most readily reached by the chute C of a truck mixer delivering concrete to the job site.
  • the hopper 33 will be positioned such that the truck mixers can move directly to and away from the point of discharge without the necessity of backing or otherwise maneuvering into position to reach it.
  • the discharge end of the holding mixer 10 is conveniently located to be reached by the bucket B or other means adapted to receive concrete from the discharge chute 28.
  • the chute 28 may, of course, be provided with one or more extensionv sections, as required, and the pivotability of the chute may, in some instances, make direct final placement therefrom feasible.
  • a truck mixer can discharge its entire load of concrete into the hopper 33 in one continuous operation.
  • the conveyor belt 32 carries the concrete to the charging hopper 25 through which it is funneled to the interior of the drum 14.
  • the drum may be rotating in either the direction for holding and mixing or the direction for discharge depending on the immediate requirements of concrete for placement. If the former, the concrete will be moved forwardly by the spiral blade 26 and accumulated in the larger and lower forward end of the drum 14.
  • the drum capacity is preferably greater than the capacity of the average truck mixer delivering concrete, with 9 to 10 cubic yards being a practical minimum capacity. In this manner, a halt or temporary delay in pouring will not effect any corresponding delay in the discharge of concrete from the truck mixer.
  • the receiving end 41 of the conveyor 13, including the receiving hopper 33, which extends beyond the forward end of the trailer 12 is retractable for transport or to allow truck mixers or other equipment to move past as may be required for effective operation in a confined area.
  • the receiving end may be attached by a pivot 42 to the remainder of the conveyor 13, and may include a power-operated retracting means (not shown).
  • a substantial portion of the conveyor, including the siderails and idlers, is, however, preferably constructed of aluminum or other lightweight materials, whereby manual retraction of the receiving end 41 is easily accomplished.
  • the receiving end may also be designed to telescope into the remaining portion to effect retraction, in a manner known in the art.
  • the entire conveyor 13 is adapted to be demounted from its operative position secured to the mixer frame extensions 34 and 35.
  • the conveyor siderails 29 may be attached to the frame extensions 34 and 35 by means of pinned connections 44 and 45, respectively, for rapid demounting. With the conveyor removed, the unit is a conventional semitrailer-mounted transit mixer and may be operated as such without any further modification.
  • a slat conveyor or a screw conveyor could be used in place of the belt conveyor 13.
  • the mixer 11 and conveyor 13 could, as an alternate embodiment, be mounted on a standard chassis-cab unit, as mobile concrete mixers most often are. A half-ca would be required for this embodiment to provide space for the descending forward portion of the conveyor.
  • an inclined belt conveyor arranged over said drum with its inclination in the same direction as the axis of said drum, said belt conveyor having a head pulley arranged over said hopper to cause material conveyed by the belt to discharge into the hopper, and a tail pulley conveniently low to the ground to enable charging of the belt conveyor by a similar concrete mixer mounted on a delivery truck, or by other means;
  • drum may be used to accommodate surges in supply of concrete in excess of the desired rate of discharge of concrete from the mixing drum.
  • a portable concrete mixer for temporary holding of mixed concrete delivered to a job site which comprises: a transportable frame, a power driven inclined conveyor carried by said frame and having a lower hopper disposed to receive mixed concrete from a delivery vehicle and having an upper charging hopper, an inclined discharge chute carried by said frame so that its upper end remains effectively positioned beneath said hopper and so that its lower end may be variously positioned to deliver by gravity the concrete into a receiving bucket or the like positioned within the reach of the chute, and an inclined-axis power-driven spiral-bladed concrete mixing drum carried by said frame and having its charging and discharging opening disposed to receive the concrete discharging from said charging hopper and to deliver the same to said chute as required whereby to provide temporary storage in the order of one full load of a typical delivery vehicle so that the uninterrupted supply of concrete to the job site is materially assured.
  • a portable concrete mixer unit for temporary holding of mixed concrete delivered to a job site which comprises: a vehicle including a frame, wheels for transport to and ground-stabilizing legs for stationary positioning at the job site, a concrete mixing drum supported by said frame for rotation on an inclined axis and having an upper open end at one end of the vehicle, said drum internally having spiral blades which extend to said drum opening and define a smaller central charging opening, power means carried vby the vehicle and connected to said drum to rotate the latter in one direction which causes the blades to push the drum contents to the lower closed end thereof and in the other direction to push the contents toward and out of the upper open end thereof, a charging hopper for said drum carried by said frame and having its spout extending into said smaller central opening of the drum, an inclined power-driven conveyor carried by said vehicle frame and having a receiving hopper disposed at the other end of the vehicle to receive mixed concrete as from a delivery truck, said conveyor extending longitudinally over said drum and having its discharge trajectory directed into said charging hopper, and an inclined discharge chute pivotally supported by said frame on

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
US39495A 1970-05-21 1970-05-21 Concrete holding mixer Expired - Lifetime US3612491A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3949570A 1970-05-21 1970-05-21

Publications (1)

Publication Number Publication Date
US3612491A true US3612491A (en) 1971-10-12

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Application Number Title Priority Date Filing Date
US39495A Expired - Lifetime US3612491A (en) 1970-05-21 1970-05-21 Concrete holding mixer

Country Status (5)

Country Link
US (1) US3612491A (2)
CA (1) CA951718A (2)
DE (1) DE2123129A1 (2)
FR (1) FR2091609A5 (2)
GB (1) GB1327922A (2)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866889A (en) * 1972-08-16 1975-02-18 Stowell Ind Inc Mobile conveyor system
US3888467A (en) * 1973-09-27 1975-06-10 Charles W Sheets Concrete holding and mixing assembly and method of transporting and distributing concrete
US3901485A (en) * 1972-05-24 1975-08-26 Schwing Gerhard Concrete delivery units
US3958304A (en) * 1973-04-09 1976-05-25 Iowa Beef Processors, Inc. Machine for washing tripe
US4441820A (en) * 1982-09-27 1984-04-10 Maxon Industries, Inc. Concrete mix surge bin
US5785419A (en) * 1995-10-10 1998-07-28 Mckelvey; Paul A. Lightweight building material and method of construction of cast-in-place structures
US20080111267A1 (en) * 2004-09-20 2008-05-15 Luca Toncelli Method for Manufacturing Articles in the Form of Thin Slabs of Composite Stone and Resultant Articles
US20180142431A1 (en) * 2016-11-18 2018-05-24 Dragon Asphalt Equipment, LLC Portable paving material mixing apparatus
CN114312684A (zh) * 2022-01-14 2022-04-12 洛阳中集凌宇汽车有限公司 一种甩挂结构混凝土搅拌运输半挂车

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1126793B (it) * 1977-08-19 1986-05-21 Commerciale Agricola Spa Macchina per la miscelazione e la distribuzione di mangime foraggi e prodotti destinati alla alimentazione del bestiame
DE3148598C2 (de) * 1981-12-09 1986-01-30 Elba-Werk Maschinen-Gesellschaft Mbh & Co, 7505 Ettlingen Vorrichtung zur kontinuierlichen Betonbereitung
US4940335A (en) * 1988-11-21 1990-07-10 Gibson Adler E Method and apparatus for adding predetermined quantity of material to a reactor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2357583A (en) * 1942-07-29 1944-09-05 John S Franco System and apparatus for handling concrete
US3038705A (en) * 1959-11-16 1962-06-12 Machinery Company Const Drum for truck mounted concrete mixers
US3185450A (en) * 1963-10-07 1965-05-25 George P Duecy Cement transporting and placing machine
US3526392A (en) * 1968-05-20 1970-09-01 Rex Chainbelt Inc Method of hauling and mixing concrete

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2357583A (en) * 1942-07-29 1944-09-05 John S Franco System and apparatus for handling concrete
US3038705A (en) * 1959-11-16 1962-06-12 Machinery Company Const Drum for truck mounted concrete mixers
US3185450A (en) * 1963-10-07 1965-05-25 George P Duecy Cement transporting and placing machine
US3526392A (en) * 1968-05-20 1970-09-01 Rex Chainbelt Inc Method of hauling and mixing concrete

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3901485A (en) * 1972-05-24 1975-08-26 Schwing Gerhard Concrete delivery units
US3866889A (en) * 1972-08-16 1975-02-18 Stowell Ind Inc Mobile conveyor system
US3958304A (en) * 1973-04-09 1976-05-25 Iowa Beef Processors, Inc. Machine for washing tripe
US3888467A (en) * 1973-09-27 1975-06-10 Charles W Sheets Concrete holding and mixing assembly and method of transporting and distributing concrete
US4441820A (en) * 1982-09-27 1984-04-10 Maxon Industries, Inc. Concrete mix surge bin
US5785419A (en) * 1995-10-10 1998-07-28 Mckelvey; Paul A. Lightweight building material and method of construction of cast-in-place structures
US20080111267A1 (en) * 2004-09-20 2008-05-15 Luca Toncelli Method for Manufacturing Articles in the Form of Thin Slabs of Composite Stone and Resultant Articles
US8007697B2 (en) * 2004-09-20 2011-08-30 Luca Toncelli Method for manufacturing articles in the form of thin slabs of composite stone and resultant articles
US20180142431A1 (en) * 2016-11-18 2018-05-24 Dragon Asphalt Equipment, LLC Portable paving material mixing apparatus
CN114312684A (zh) * 2022-01-14 2022-04-12 洛阳中集凌宇汽车有限公司 一种甩挂结构混凝土搅拌运输半挂车
CN114312684B (zh) * 2022-01-14 2023-08-29 洛阳中集凌宇汽车有限公司 一种甩挂结构混凝土搅拌运输半挂车

Also Published As

Publication number Publication date
CA951718A (en) 1974-07-23
FR2091609A5 (2) 1972-01-14
DE2123129A1 (de) 1971-12-02
GB1327922A (en) 1973-08-22

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Legal Events

Date Code Title Description
AS Assignment

Owner name: REXWORKS, INC., A CORP. OF DE.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:REXNORD INC.;REEL/FRAME:004000/0737

Effective date: 19820423