US675035A - Machine for mixing concrete. - Google Patents

Description

No. 675,035. Patented May 28, I90l.

C. T. DRAKE. MACHINE FOR MIXING CONCRETE.

(Application'filed July 18, 1899..)

(No Model.)

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CHESTER T. DRAKE, OF CHICAGO, ILLINOIS.

MACHINE FOR MIXING CONCRETE.

SPECIFICATION forming part of Letters Patent No. 675,035, dated May 28, 1901.

Application filed July 18, 1899.

To (LZZ whom, it may concern:

3e it known that I, CHESTER T. DRAKE, a citizen of the United States, residing in Ohicago, in the county of (look and State of Illinois, have invented a new and useful Improvement in Machines for Mixing Concrete, of which the following is a specification.

My invention relates to machines having one or more shafts armed with knife-bars which extend from the shaft radially and as the shaft is revolved pass through the concrete material beneath the shaft, so as to mix the ingredients.

The nature of my invention consists in part in the arrangement upon a rotating shaft of knives of peculiar shapes adapted to thoroughly and rapidly mix the several ingredients of the concrete.

It consists also in part in the arrangement of a series of hoppers provided with spiral conveyers, which may be revolved at any speed desired, so as to feed the ingredients which are thrown into the separate hoppers respectively as fast as may be desired and so as to vary the proportion of the sand,

cement, and stone entering into the mixinghopper.

In the drawings, Figure 1 is a side elevation of my machine. Fig. 2 is a plan view of the machine as seen from above it. Fig. 3 is an end elevation showing the driving-wheels at the feed end of the machine. Fig. 4 is a view of one of the shovel-arms of the mixing-shaft, and Fig. 5 is a view of one of the knife-arms of the mixing-shaft.

A represents the strong wooden frame and bed of the machine.

B represents the platemetal hopper, in which the materials are mixed by the revolving arms H I, which are secured in strong metal hubs which fit upon the square shafts D.

O, C, and C are plate-metal hoppers, which are provided, respectively, with the spiral conveyers J J J upon the shafts F F, F respectively, and these shafts arejournaled, so that the lower side of each spiral conveyer will reach to the interior bottom surface of its hopper and crowd the material (1). 6., stone shoveled into hopper C, sand shoveled into hopper C and cement shoveled into hopper G) toward and out of the discharge end of its Serial No. 724,238. (No model.)

hopper, so that the ingredient materials will fall in to the mixing-hopper beneath and beyond the receiving-hoppers.

The square shafts D have journals turned upon them to fit the boxes 6 and are provided with twin gears E, so that their motion shall be uniform, and another gearwheel upon one of the shafts receives the power which drives them.

Strong metal knife-arms H and shovel-arms I are secured in the hubs, which fit upon the shafts D and revolve with the shafts and stir together the separate materials within the mixing-hopper. The disposition of the knife? arms H and shovel-arms I upon the respective shafts is such that as they are rotated the mixing-blades on one of the shafts will work in the spaces next adjacent the respective sides of the shovel-blades. The shovel-arms present their wide fiat surface to the material as they revolve and scoop up the material, carry it upward, and allow it to fall to the bottom turned upside down, so as to more thoroughly intermix the ingredients. The knife-arms present their narrow edges to the material as they revolve, and all the arms II I stand aslant or obliquely on shafts D as much as may be desired, so as to crowd the material toward the discharge end of the mixing-hopper as they revolve, and all should extend downward to the inner bottom surface of the mixing-hopper.

The shafts D have sprocket-wheels (31 upon them, and the spiral-conveyor shafts have wheels fff, respectively, of any size desired,

and sprocket-chains communicate powerfrom wheels d to wheels f, so as to drive the spiral conveyers at any desired rate of speed relative to each other, and thus regulate the proportions of the ingredients entering into the mass of concrete or vary said proportions by changing the sprocket-wheels.

I claim as my invention- 1. In a concretemixer, the combination with a casing, of a plurality of shafts therein, means for operating the shafts, shovel-blades on one of said shafts, and mixer-blades on the opposite shaft arranged and adapted to work in the spaces next adjacent the respective sides of the shovel-blades substantially as described.

2. In a concretemixer, the combination with a casing,ofparallel shafts mounted therein, means for rotating the shafts, shovel and mixer blades mounted on the respective shafts and so disposed that in operation the shovel-blades will pass between a pair of mixer-blades, substantially as described.

3. In combination with a concrete-mixer, of a supporting-framework, hoppers therein at substantially the same level and adjacent said mixer, and chutes G at opposite points on the framework for directing the material discharged from the outer hoppers toward the center hopper, substantially as described.

4. In a concrete-mixer, the combination with a mixing-chamber, of parallel shafts therein, mixer-blades on the shafts, a series of hoppers adjacent the miXing-chamber,and means for directing material from all of the CHESTER T. DRAKE.

Witnesses:

OSCAR PETERSON, JOSEPH M. WEBER.

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