US1322289A

US1322289A - Concrete-mixing machine

Info

Publication number: US1322289A
Authority: US
Publication date: 1919-11-18
Anticipated expiration: 1936-11-18

Description

F. D. CHAPMAN.

CONCRETE MIXING MACHINE.

APPLICATION FILED NOV.22,1915.

Patented Nov. 18, 1919.

2 SHEETS-SHEET 1.

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w INVENTUF? ATTO/ INEYE.

F. D. CHAPMAN.

CONCRETE MIXING MACHINE.

I APPLICATION FILED NOV-22.1915. 1,322,289

2 SHEETS-SHEET 2.

Patented Nov. 18, 1919.

/\/\/E/\/TG J"R ATTUFWEYE FRANK DALTON CHAPMAN, F BERLIN, WISCONSIN.

CONCRETE-MIXING MACHINE,

Specification of Letters Patent.

Patented Nov. 18, 1919.

Application filed November 22, 1915. Serial No. 62,714.

To all whom it may concern:

Be it known that I, FRANK DALTQN CHAP- MAN, a citizen of the United States, and resident of Berlin, in the county of Green Lake and State of Wisconsin, have invented new and useful Improvements in Concrete- Mixing Machines, 'of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification. v

This invention relates to improvements in concrete mixing machines for mixing cement, crushed stone, sand and water in formino' concrete. It is one of the objects of the present invention to provide a concrete mixing machine in which the drum forming part of the mixer is directly rotated by the shaft of the driving means mounted upon the same frame as the mixer. y

A further object of the invention is to provide a concrete mixing machine in which the drum is supported by and revolves in a ball bearing forming part of the frame.

A. further object of the invention is to provide a concrete mixing machine in which the drum has mounted therein a series of mixing blades which coact with one another in moving the material toward and away from the discharge end of the drum to thoroughly mix the material.

A further object of the invention is to provide a concrete mixing machine in which the mixing drum is rotated by a worm and wormwheel drive directly from the shaft of the motor mounted on the sameframe.

A further object of the invention is to provide a concrete mixing machine which is of simple construction, is strong and durable and is well adapted for the purpose described.

With the above and other objects in view the invention consists of the improved concrete mixing machine and its parts and combinations as set forth in the claims, and all equivalents thereof.

In the accompanying drawings in which the same reference characters indicate the same parts in all of the views:

Figure 1 is a transverse sectional view of the improved concrete mixing machine taken on line 1-1 of Fig. 2;

Fig. 2 is a horizontal sectional view taken on line 2-2 of Fig. 1;

F ig. 3 is a longitudinal sectional view taken on line 3-3 of Fig. 1;

Fig. 4 is a detail view of the end of the drum; and

Fig. 5 is a diagrammatic plan view of the mixing drum and blades with the drum rolled out in flat form.

. Referring to the drawings the numeral 8 indicates a suitable supporting frame which is mounted on wheels 9. The supporting frame is formed of a transversely extendmg angle iron 10 to the ends of which short rear axles 11 are mounted. Atubular frame member 12 extends rearwardly at right angles from the angle iron 10 and at its rear end is provided with a caster wheel 13 for steering the frame. The tubular member is braced to the angle iron by anguat a minimum cost.

.A drum supporting member 16 rigidly and adjustably mounted on the tubular member of the frame by U-shaped bolts 17,

extends upwardly therefrom at an angle and at its upper end has a two-part annular drum bearing 18 mounted thereon. The axis of the drum bearing extends at right angles to the tubular member of the frame and a mixing drum 19 extends revolubly through said bearing and is provided with a wormwheel 20 formed integral therewith which extends between and is revolubly supported by the two parts of the two-part member. The wormwheel 20 is formed with annular bearing shoulders 21 which register with the annular shoulders 22 of the drum bearing 18 to receive bearing balls 23 therebetween. The bearing balls 23 are positioned on each-side of the wormwheel and form a firm bearing with a minimum amount of friction. Bolts 24 clamp the two parts of the two-part drum bearing together.

The drum is of conical shape with its charging-opening 25 in its larger end and its discharging openings 25 in its smaller end. The smaller end portion 27 of the drum including the wormwheel is formed of cast metal and is partly closed at the end and the larger end portion 28 is formed of sheet metal provided with a cast metal end plate 29 to reduce the diameter of the charging opening of the drum.

The axis of the drum is inclined upwardly to position the lower peripheral edge portion thereof in a horizontal plane so that larly extending brace bars 1 1 and a transmaterial within the drum will beworke d In order to completelymix the material and to prevent the too rapid movement of the material toward the discharge end of the drum, the drum is provided with a number of

deflecting blades

30, 31, 32 and 33 which extend at different angles'to work the material back and forth.' It will also be noted that the blades .30 and 31'are spaced inwardly a greater distance from the drum than the other blades. This arrangement ;..of the blades permits some of the material to pass between the blades and the side portions of the drum and divides thematerial 'into. difl'erent'moving stratas which move independentl of one another and more completely mix t e material.

The lower portion of the drum bearing is formed with a chamber 34 to receive a worm 35 which is: in mesh with the worm wheel 20. The worm 35 is mounted on a shaft 36 which'is journaled inthe drum bearing and one end of the shaft is in line with and is connected to the engine shaft 37 by an interposed shaft 38 and universl coupling members 39. y

While the worm shaft is preferably shown as indirectly connected to the engine shaft 1 it iato be understood that the invention contemplates the direct mounting of the worm shaft upon the extended gine shaft. The'motor 4O portion of the. en-

transverse brace bar 15 and ma type desired.

The discharge openings 26 at the small end of the drum are of segmental form and are located diametrically opposite each other. The discharge openings are closed during the mixing operation by means of a be of any trally, pivotally mounted on a pivot bolt 4-2 projecting rearwardly from the rear portion of the drum and revolves with said drum. A

coiled spring 43 surrounding the bolt and interposed between the head of the bolt and the segmental gate holds the said gate frictionally against the end of the um and in adjusted position. A ring 44 extending around and spaced from the rear portion of the drum'is connected to thesegmental gate by angular straps 45. The ring 44 serves as a convenient handle for turning the gate to open or closed position but may be dispensed with if desired.

porting ring, together with is mounted upon the transversely extending angle iron 10 and the In operation the driun material through the charg the drum is then rotated to mix the material. In mixing the material is moved baekwardly and forwardly toward both is charged with drops downwardly and is thus completely the gate is turned to open position and during the rearward movement of the material end-portion sustains the load of the drum,

and as its Worm-gear is formed with annular shoulders 21 on each side thereof, and which cooperate with the shoulders 22 on the supthe ball-bearings 23, provides a bearing for the drum which will prevent tilting in either direction with respect to its rigid supporting ring. The supporting ring also forms a housing for the worm and its gearing, thereby protecting it from dirt and grit.

From the foregoing description it will be seen that the concrete mixing machine is of and is well adapted very simple construction for the purpose described.

What I claim as my invention is:

I. A concrete mixing machine, a conical mixing drum formed tively heavy small-end portion and a relatively light large-end portion telescopically fitting in said small-end portion and supported thereby, said small-end portion being provided with a closable discharge gate at its rearend and a worm-gear extending around its front edge and formed with an annular shoulder at each side of the gear, a supporting rmgengaging around said wormgear also provided with annular shoulders whichregister with theshoulders on the supporting ring, said supporting ring forming a sole support for the mixing drum, bearing balls mounted between .the registering shoal ders of the worm-gear and supporting rirn a worm mounted in the supportin ring in meslrwith the worm-gear for rotating the mixing drum, and means for securing said supporting ring to a main support.

2. A concrete mixing machine, comprising a mixing drum formed with a worm-gear around its periphery intermediate its ends, a supporting ring inclosing and formed with a closed chamber at its lower side, a supporting member secured to the lower side of said supporting ring and provided with a single cylindrical bearing member at its lower end adapted to be ends of the drum and is also carried upwardly by the drum and the blades and then ing opening and mixed. When mixed single supdrum bearformed 1 comprising of a relasaid worm-gear clamped to a single longitudinally extending member of a main support, a worm mounted in said closed chamber of said supportmg ring and in mesh w1th said worm-gear to rotate said mixing drum, and means for I drum, a support for the same, means for rotating said drum, and a series of relatively long deflecting blades secured to the interior of said drum free from each other and extending at different angles for deflecting the material back and forth in the drum, said blades being mounted spaced respectively at different distances from the wall of the drum, whereby stratas'of material of diflerent thicknesses will be formed in the drum during the mixing operation.

In testimony whereof I afiix my signature, 30

in presence of two witnesses.

FRANK DALTON CHAPMAN.

Witnesses:

W. N. CRAWFORD,---. A. L. PARDY.