US3802669A

US3802669A - Method for producing raw concrete

Info

Publication number: US3802669A
Application number: US00311727A
Authority: US
Inventors: R Nohmura
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-08-23
Filing date: 1972-12-07
Publication date: 1974-04-09
Anticipated expiration: 1991-04-09
Also published as: FR2197340A5; GB1402473A; DE2303344C3; DE2303344B2; BR7209126D0; JPS4939609A; DE2303344A1

Abstract

A method for producing raw concrete is disclosed. A container having a predetermined amount of sand, ballast and cement accommodated therein is put into a rotary drum and a predetermined amount of water is poured in the container. The air is then forced into the container so as to bring the container into pressure contact with the drum, which thereafter is rotated to mix the contents in the container, and raw concrete is obtained.

Description

United States Patent 1191 Nohmura Apr. 9, 1974 METHOD FOR PRODUCING RAW 3,018,880 1/1962 Brugmann 150/1 x CONCRETE 3,030,081 4/1962 Wilson et 211.... 259/81 R X 3,131,741 5/1964 Darling et al 206/47 A X [76] Inventor: Ryotaro Nohmura, 3,374,929 3/1968 Silfverskiold 1. 150/1 x 3-chome, Osaka, Japan [22] Filed: 7! 1972 Primary EraminerPeter Feldman [211 App]' Nod 7 7 Assistant E.\'aminer1 hiIip R. Coe

Attorney, Agent, or FzrmWenderoth, Lind & Ponack [30] Foreign Application Priority Data Aug. 23, 1972 Japan .L 47-85721 [57] ABSTRACT [52] US. Cl 259/147, 150/ 1, 206/47 A, A method for producing raw concrete is disclosed A 259/50 259/891 259/151 259/177 R container having a predetermined amount of sand, [51] II). C]. ballast and Cement accommodated therein i p i [58] Field of Search 259/3, 14, 30, 49, 50, a rotary drum and a predetermined amount of Water is 259/57 81 81 poured in the container. The airis then forced into the 148, 151, 161, 164, 169,175, 1 76, 177 container so as to bring the container into pressure 150/1 206/47 A contact with the drum, which thereafter is rotated to mix the contents in the container, and raw concrete is [56] References Cited 1 obtained. UNITED STATES PATENTS I I 2,988,207 6/1961 Lovelace... 206/47 A 2 Claims, 5 Drawing Figures PATENTEUAPR 9 I974 3802.669

I sum 2 DF 2 1 METHOD FOR PRODUCING RAW CONCRETE The present invention relates to a method for producing raw concrete.

Heretofore, raw concrete placed in a construction field was prepared in such a manner that cement, ballast and water measured in a batcher plant were put in a rotary drum of a mixer car and the mixture was stirred up by rotating the drum until the mixer car reached the field of construction.

However, since the mixer car used for transportation of raw concrete is priced very high, the cost of the raw concrete supplied by the mixer car necessarily increases. Moreover, when raw concrete is required in large quantities, a large number of mixer cars are required. Furthermore, when traffic is congested between the source of supply of raw concrete and the field of construction, a considerably long time is required for mixer cars to transport a required amount of raw concrete.

Further disadvantages are involved in the transportation of raw concrete by mixer cars. For example, when it is difficult for a mixer car to enter a construction field where raw concrete is placed, the raw concrete inside the mixer car must be conveyed to said construction field making use of a pump, and moreover said raw concrete must be further conveyed to the spot of placing by means of elevatable buckets.

An object of the present invention is to provide a method for producing raw concrete wherein sand, ballast and cement each previously measured in a batcher plant are enclosed in a container and a predetermined amount of water is poured into said container in the field of construction and said container is rotated in a mixing drum.

These and other objects are accomplished by the parts, improvements, combinations and arrangements comprising the invention, a preferred embodiment of which is shown by way of example in the accompanying drawings, and herein described in detail. Various modifications and changes in details of construction are comprehended within the scope of the appended claims.

FIG. I is a longitudinal, sectional elevation showing a rotating device for a container.

FIG. 2 is a lateral elevation thereof.

FIGS. 3 and 4 are longitudinal, sectional elevations of the container.

FIG. 5 is an enlarged section of a part of the bottom of the container.

Referring to FIGS. 1 and 2, numeral 1] denotes a pair of side frames opposite to one another, bearings 12 being provided on the upper frames of said side frames 11.

Numeral l3 denotes a cylindrical member having a bottom and mounted between the side frames 11, ll, opposite

horizontal shafts

14, 14 being provided on said cylindrical member 13 at the outside thereof, said

shafts

14, 14 being rotatably journaled in the

bearings

12, 12 provided on said side frames. Numeral 15 denotes a worm wheel mounted on one of the shafts l4, 14, said worm wheel 15 being adapted to engage with a worm gear 18.

The worm gear 18 is mounted on a shaft 16 rotatably mounted in a bearing 17 fixed to one of the side frames 11. Moreover, the shaft 16 is connected at one end thereof to a reversible motor 19, said motor 19 being mounted on a mount 20 fixed to one of the side frames 11.

Consequently, the cylindrical member 13 having a bottom is rotatable around the shafts l4, 14 as its fulcrum by rotating the motor 19.

Furthermore, a drum 21 having a bottom is inserted into the cylindrical member 13., rollers 22 being disposed in the spaces between the cylindrical member 13 and the drum 2] thereby enabling said drum 21 to rotate inside the cylindrical member 13, said rollers 22 being fitted into concavities 23 provided on the inner surfaces of the bottom wall and the side wall.

Moreover, an opening 24 is provided in the center of the bottom wall of the cylindrical member 13, a shaft member 25 being fixed in the center of the underside of the bottom wall of the drum 2] so as to project through the opening 24 of said cylindrical member 12. A sprocket 26 is provided at the lower end of said shaft member 25, a chain 29 being extended between the sprocket 26 and a sprocket 28 of a motor 27 mounted on the exterior wall of the cylindrical member 13.

Referring now to FIGS.3, 4 and 5, numeral 30 designates a container, said container 30 being produced by such a process that a core material such as glass fiber is wound like cobwebs around a synthetic resin sheet and then lined thereon with resin or that a core material such as glass fiber is wound like cobwebs around a mold and lined thereover with resin and thereafter the mold is disassembled, said container having air-tight property.

A belt 31 for hanging the container 30 is provided on the top wall thereof. An opening 32 is provided on the top wall and the bottom wall of the container 30 respectively. A tube 33 is secured at one end thereof to the interior edge of each of the openings 32, the other end thereof being gathered together and closed by a string 34.

Numeral 35 denotes a lid of the opening 32, said lid 35 being fixed at one end thereof to the container, the other end thereof being engageable with a buckle 36.

Inside the aforementioned container are stored sand A, ballast B and cement C each previously measured. FIG. 4 shows the container 30 in which are stored sand A and ballast B both containing water. In this case, the cement C is sealed in a water-proof bag D so as to prevent said cement C from absorbing water of the sand or the ballast, said bag D being torn and removed prior to producing raw concrete.

When raw concrete is required, the container 30 is suspended with the belt 31 thereof by a crane hook, said container 30 being dropped into the drum 2! of the cylindrical member 13 which is sustained vertically. Thereafter, the top wall lid 35 of the container 30 is opened by releasing the buckle 36, a measured amount of water is poured thereinto from the tube 33 by removing the string 34 thereof, air being forced into the container for expansion thereof so that said container 30 may be brought into pressure contact with the inside of the drum 21. Thereafter, the tube 33 is tied by the string 34 and the lid 35 is closed so as to prevent the compressed air from escaping.

Then the motor 19 is started, and the cylindrical member 13 commences to rotate by way of the worm gear 18 of the shaft 16 and the shaft 14 of the worm wheel engaging with said gear 18. When said cylindri' cal member 13 is inclined at a required angle, the motor 19 is stopped.

Then the motor 27 is started, and the drum 21 is rotated in one direction inside the cylindrical member 13 by the chain 29 extended between the

sprockets

28 and 26. Consequently, the container which is held in pressure contact with the drum by the compressed air rotates along with said drum 21, with the result that the sand A, the ballast B and the cement C inside said container are mixed with each other.

After the foregoing mixing process, the motor 27 is switched off, the cylindrical member 13 being adjusted by means of the motor 19 so that said cylindrical member 13 may restore its axially perpendicular position, the air inside the container 30 being released by opening the tube 33 at the side of the top wall, the container 30 being drawn out of the drum 21 by hooking the belt 31 on to a crane hook, said container 30 being conveyed to the spot where the concrete is placed, raw concrete being poured out by opening the lid 35 at the side of the bottom wall of the container 30 and also by opening the tube 33.

As described hereinbefore, this invention enables to obtain raw concrete by filling the container with sand, ballast, and cement, each previously measured, said container being placed in the drum, said drum being rotated after a predetermined amount of water is supplied thereinto. Since this invention no longer necessitates mixer cars with which to mix and transport raw concrete, this invention not only prevents the risk of a delay in the delivery of raw concrete owing to traffic congestion, but also precludes inconveniences even at a place difficult of access for a mixer car.

Furthermore, this invention enables to place raw concrete at any required place by suspending the container from a crane hook, though hitherto it was necessary to transport raw concrete from a mixer car to elevatable buckets.

In addition thereto, air is compressed into the container after said container is inserted into the drum, as a result of which the expanded container is brought into pressure contact with the inside of the drum thereby improving the support of the container by the drum.

What is claimed is:

1. A method for producing raw concrete wherein a predetermined amount of sand, ballast and cement are stored in a container having an opening at the top and the bottom thereof respectively and having a lid for closing each of the openings, a predetermined amount of water being supplied into the container after said container is inserted into a rotary drum, air being forced into the container so as to bring said container into pressure contact with the drum, the ingredients being mixed inside the container until raw concrete is obtained.

2. A method for producing raw concrete as defined in claim 1 wherein cement which is previously measured and stored in the container is sealed so as not to absorb water.