US1233198A - Apparatus for mixing concrete. - Google Patents

Description

A. E. DAVIS.

APPARATUS FOR MIXING CONCRETE. APPLICATION FILED DEC. 11, I914.

LQMAW, Patented July 10, 1917.

mvgmoa dam/v AsTURNEYS A. E. DAVIS.

APPARATUS FOR MIXING CONCRETE.

APPLICATION FILED DEC-11.1914.

Patented July 10, 1917.

2 SHEETS-SHEET 2 Hilwm INVENTOR S E s S E N W W one.

ANTHONY E. DAVIS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR 0F ONE-HALF TO FREDERICK J. GEIGEB, OF PHILADELPHIA, PENNSYLVANIA.

APPARATUS FOR MIXING CONCRETE.

Specification of Letters Patent.

Patented July 1d, 191 l.

Application filed December 11, 1914. Serial No 876,641.

To all whom it may concern:

'Be'it known that I, ANTHONY E. DAVIS, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful'Apparatus for Mixing Concrete, of which the following is a specification.

In the apparatus ordinarily employed in the making of a concrete mixture, it has been found impossible to obtain the same results which are obtained by mixing the aggregates by hand after the first batch has been mixed, since, under ordinary practice, the aggregates and water are placed in a mixer, and after the mixing apparatus is actuated, the wet particles of the mixture adhere to the mixing side of the chamber, so that in the succeeding batches, the particles of coarse material employed are not uniformly coated with a film of cement and .a homogeneous product is not obtained.

It is the object of my present invention to devise an apparatus for mixing concrete which will overcome the defects above noted and wherein the cement and sand, or the cement, lime and sand together with the coarser material forming the aggregates are first mixed in a dry condition and after being thoroughly mixed are discharged into a second mixing mechanism together with the necessary amount of water and by such means each particle of the aggregate has -the requisite coating of cement thereon, and

a uniform and homogeneous mixture is produced.

With the above in view my invention consists of anovel apparatus for mixing concrete.

Other objects and advantages of my in vention will hereinafter more clearly appear in the detailed description thereof.

For the purpose of illustrating my invention, I have shown in the accompanying drawings one form thereof which is at present preferred by me, since the same will give 1 in practice satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described.

Figure 1 represents,.in sectional elevation, an apparatus embodying my invention.

The apparatus employed in carrying out my invention may vary widely in construction and in the form shown for purposes of illustration, 1 designates a vehicle of any desired or conventional type on which is mounted an engine or motor 2 of any desired or conventional type. 3 designates the connecting rod which is operatively connected with the main driving shaft 4. 5 designates a gear keyed on the shaft land provided with a clutch mechanism 6 whereby it may be moved into and out of engagement with a gear 7 carried by a shaft suitably journaled, and 8 designates a sprocket wheel mounted to rotate in unison with said shaft and provided with a sprocket chain 9 which passes around a sprocket wheel 10 fixed to a mixing drum 11. The drum 11 is provided at its ends with the bearings 12 which are mounted on the grooved rollers 13 carried by the standards 14 which latter are mounted on the vehicle framework The drum 11 has its central'portion cylindrical and is tapered toward each end and is provided with any desired-number of baffles 15 which may be arranged in any desired manner, it being understood that these baffles extend preferably from one end of the drum 11 to the other end thereof. Provision is made for discharging material from the center portion of the drum at any desired place thereof by providing a series of slides 16 which engage the walls of the groove 17 in the shell of the drum to control the series of closely related apertures 50. 18 designates a stationary hopper which is carried by standards 19 mounted on the vehicle framework. The shaft 4 has mounted thereon a sprocket wheel 20 which is interlocked with the shaft 4E by means of clutch mechanism 21 and a sprocket chain 22 is provided which passes around a sprocket wheel 23 mounted to rotate in unison with a gear 241, which latter is in mesh with a gear 25 carried by a shaft 26 journaled in a container 27, The shaft 26 is provided with mixing or stirring blades 7 28 the construction and arrangement of which may be widely varied and still be within the spirit of my invention. The container 27 is provided with a discharge opening29 which communicates with a discharge spout 30.

31 designates a conduit through which water may be discharged into the container 27 simultaneously with the discharge of the aggregates from the drum 11. I preferablyprovide a power loading device whereby the aggregates may be placed in the rotating drum 11 and for this purpose I provide a measuring bucket 32 whichis provided with rollers 33 which travel on the standards 34 which form guides and which are pivoted at their upper ends, at 35, to the standards 19 and are provided with a hook 36 which engages a lug 37 on said standards. The bail 38 of the bucket 32 is connected at 39 to the lower end of the bucket and said bail has removably connected therewith a cable 40 which passes over pulleys 41 carried by the standards 19 and over the pulley 42 to a winding drum 43. Said drum 43 is provided with a clutch mechanism 44 whereby the gear 45, which is mounted to rotate in unison with said drum 43, may be moved into or out of mesh with a gear 46 fixed on the main driving shaft 4. The main driving shaft 4 is preferably provided with fly wheels 47. The upper ends of the. guide members 34 are deflected to form an inwardly extending flange 48, see Fig. 2, so that when the measuring bucket is raised the upper rollers 33 will abut against said flanges so that the measuring bucket will be tilted and the contents thereof are discharged therefrom into the stationary hopper 18.

In the operation, the aggregates are placed in the hopper 18 either by shoveling the same thereinto or by placing them in the measuring bucket 32 and actuating the clutch mechanism 44 to cause the same to be automatically discharged into the stationary hopper 18 from whence they pass into the drum 11. The slide 16 which has previously been opened to permit discharge of the material from the hopper 18 intothe drum 11 is nowclosed and the clutch .mechanism 6 is actuated to operatively connect the sprocket wheel 10 with the main driving shaft 4 whereby the drum 11 is continuously rotated.

The rotation of the drum continues until the dry aggregates have been properly mixed and this mixing action is increased owing to since the cement in a wet state adheres to the walls of the mixing chamber. In accordance with my present invention, I am enabled to obtain at all times a uniform and homogeneous product.

' The apparatus shown illustrates one manner of carrying out the invention in practice and is a simple and compact construction so that it will occupy but a minimum amount of space. The guides 34 may be disconnected and also the measuring bucket, so that the apparatus may be employed between the curb of the road and the car track without interfering with the traflic.

Owing to the provision of the slide or gate valves 16, any desired opening in the drum 11 may be brought into register with the hopper 18 or with the container 27, as is evident.

It is to be understood that changes in the construction may be made within the spirit and scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A mixing drum rotatably mounted and provided with a series of closely related apertures in its periphery and having individual closures therefor, said drum having mixing elements therein adjacent to and below each of said openings.

2. A mixing drum provided with a series of closely related apertures in its periphery having individual closures, and longitudinal mixer deflectors below said apertures and within the drum.

3. A mixing drum rotatably mounted and provided with a series of closely related apertures at the central portion of its periphery, individual means to close each aperture, and

a battle within the drum beneath each aperture.

ANTHONY It. DAVIS.

Images