Abstract: A mobile concreting apparatus and method which may be used, in particular, for on-site construction of swimming pools. It includes a vehicle supporting a plurality of containers, each adapted to contain one of the ingredients of concrete. Each container is provided with its own ingredient feeder which feeds the ingredients to a mixing device mounted on the vehicle to create a concrete slurry. The slurry is transferred from the mixing device to the surface to be coated by a structure including a slurry pump, a hose and a nozzle. Each ingredient feeder can be individually varied in the rate at which it feeds its ingredient so that the relative composition of the slurry, and the flow rate of the slurry, can be rapidly and selectively varied on the job site to meet the particular requirements for each job. In addition, feed rate settings which provide a desirable composition and overall feed rate can be noted and reproduced on subsequent occasions when the same composition and feed rate are desired.

Abstract: A concrete mixing machine is disclosed which mixes small batches of concrete using any desired ratio of gravel, sand, cement, and water. The dry materials are mixed into concrete at the site where the concrete is to be poured. The apparatus includes hoppers for storing the dried mix material, a water tank, a metering slide for measuring desired amounts of cement, sand, and gravel to the desired proportions; a mixing, feeding, and dispensing system; and a hydraulic system for driving the mixing apparatus. The hydraulic drive system is utilized to overcome the binding which occurs when residual concrete begins to set.

Abstract: A characteristic feature of the invention lies in that a container for each liquid component, incorporated in a sand machine, is provided with an actuator intended for effecting forcible opening of the container spring-loaded valve, a device for controlling this actuator, and an eccentric mounted on the shaft of a drive for actuating feeders and acting on the control device; each proportioner for a fluid component is provided with spring-loaded diaphragms, of which one is adapted to control a feeder for loose components and the other, to close the feeder outlet. The connection between the feeders is effected by an intermediary member connected with the spring-loaded diaphragm and brought in contact with a cam mounted on the shaft of the drive for feeders and set at an angle of 2 to 15 deg. relative to the eccentric.

Abstract: A substantially cylindrical canister is oriented in an upright position with its fill hole directed upwardly, and hydraulic cement is loaded into the top of this canister. The canister is then tipped on its side and connected via a swivel coupling to a suction line and to a line through which a radioactive-waste slurry may be fed. The interior of the canister is then evacuated and the canister is rotated about a horizontal axis passing through this swivel coupling. Radioactive waste is then sucked into the canister by the subatomospheric pressure therein and is intimately mixed with cement already inside the canister by inwardly projecting mixing vanes provided inside the canister.

Abstract: A mixer especially for mixing materials such as cement and sand with water and with a fibrous reinforcing material such as glass fibre. The mixer consists of a tubular casing containing a skeletal rotor constructed from a plurality of rods extending longitudinally of the casing and spaced apart laterally of each other at positions circumferentially spaced apart around the axis of rotation of the rotor and the longitudinal axis of the casing. The rods are supported on end plates and a central shaft or stub shafts extending from the end plates. The rods are enveloped along at least part of the axial length of the rotor by a helical, outwardly-directed flight having widely-spaced convolutions to impart a component of movement to the mix along the inside of the tubular casing to an outlet.

Abstract: Apparatus of the invention includes a dispenser for mixing an discharging layers of the molding material onto the mold forming pattern, and means for producing selectively controlled relative movement between the dispenser and the pattern including a control system for varying the ratio of sand and binder in the mixture being dispensed in accordance with the relative position of the dispenser and the pattern. The apparatus may thus be controlled to provide for selectively variable ratios of sand and binder in accordance with the strength required of the mold at a particular position. The system also provides a selectively variable control of the thickness of each layer of molding material as the mixing head or pattern moves on a three axis coordinate system.

Abstract: Apparatus for simultaneously mixing and conveying particulate material, the apparatus comprising a housing having an input end and an output end disposed vertically higher than the input end, means for feeding the particulate material into the input end of the housing, a conveyor disposed within the housing and having a plurality of lifting surfaces provided with perforations therethrough so that a portion of the particulate material being lifted by each lifting surface descends through the perforations and is mixed with particulate material being lifted by lifting surfaces disposed therebelow, and means for discharging the mixed particulate material from the output end of the housing.

Abstract: A mixing apparatus for the continuous mixing of a dry bulk material with a liquid to form a slurry. The dry material is introduced through an elongated vertical tube while the liquid is brought into an elongated cylindrical chamber around that tube in a rotary motion under pressure. The liquid with its rotary motion and being under pressure exits from an adjustable annular orifice at the same point that the dry bulk material is added to the slurry whereby the jetted liquid effects the initial mixing process while deflecting the material into a reservoir. The slurry thus formed is circulated by a suitable pumping system from the reservoir for use. The unused slurry is pumped back into the reservoir by way of a voluted shroud which envelopes the mixing portion of the initial mixing device. Centrifugal force resulting from this rotary motion of the slurry tends to pull the newly mixed slurry out into the reservoir for a continuous intimate mixing process.

Abstract: A system and method to control concrete production employs a loading station and a mixing truck having a rotatable mixing drum for travelling between the loading station and a job site. A control system is provided to insure that properly proportional ingredients loaded into the mixing drum at the loading station are mixed for a predetermined appropriate programmable interval of time, whether the mixing truck remains at the loading station or is in transit to the job site. The control system comprises a first portion installed at the loading station and a second portion mounted on the mixing truck, which portions are coupled together when the mixing truck is at the loading station. The first portion of the control system comprises a first time switch unit for controlling the entire time cycle (loading time and mixing time) in a first program and a second time switch unit for controlling only the loading time in a second program.