US1998635A

US1998635A - Concrete mixer

Info

Publication number: US1998635A
Application number: US573796A
Authority: US
Inventors: Henry K Paris
Original assignee: PORTER W YETT
Current assignee: PORTER W YETT
Priority date: 1931-11-09
Filing date: 1931-11-09
Publication date: 1935-04-23
Anticipated expiration: 1952-04-23

Description

Apri 23, 1935. H. K, PARIS 1,998,635

CONCRETE MIXER Filed Nov. 9, 1931 2 Sheets-Sheet 1 E@ m. w m( Si; L w

im W z 'INI/ENTOR,

HE NRV K. PAR/S. YQN/W ATTRNEY H. K. PARS CONCRETE MIXER prl 23, 1935.

Filed Nov. 1931 2 Sheets-Sheet 2 INVENTOR, HENRY K. PAR/S.

BgQw-// 'l y ATTORNEY Patented Apr. 23, 1935 CONCRETE MIXER Henry K. Paris, Oakland, Calif., assigner to Porter W. Yett, Portland, Oreg.

Application Novemberil, i931, Serial No. 573,796

4 Claims. (Cl. 83-73) My invention relates to concrete mixers and the like, and particularly to concrete mixers of the type wherein a mixing container is mounted upon an automotive vehicle, and the concrete is mixed while said vehicle is in transit.

AmongA the objects of my invention are: To provide a mixer requiring a minimum of manipulation to perform the necessary operations of loading, mixing, and dumping; to provide a mixer requiring no auxiliary hoist or equivalent apparatus in order to perform the dumping operation; to provide a mixer wherein the operation of tilting the container for transit or :for dumping is under especially accurate control, and wherein said control may be exercised from a plurality of points; to provide a mixer of light weight, permitting a large pay load to be carried on a vehicle of given capacity; to provide a mixer wherein the charge is concentrated, instead of being spread out through the mixing container, thus insuring speedy and eiiective mixing; and to provide a mixer of unusual simplicity, whose mechanism is rugged and economical.

Other objects of my invention will be apparent or will be specifically pointed out in the description forming a part of this specification, but I do not limit myself to the embodiment of my invention herein described, as various forms may be adopted within the scope of the claims.

Referring to the drawings:

Figure l is an elevation of an automotive concrete mixer embodying my invention. f

Figure 2 is a rear elevation showinU a portion of the mixer illustrated in Figure i, parts of the mixer being cut away in the drawings.

Figure 3 is a detail sectional view, the plane of section being through the hinge or pivot whereon theV mixing container tilts.

Figure l is a detail View, on a larger scale rthan Figure l, illustrating the tilting and mixing mechanism of the mixing container or'drum.

Figure 5 is a transverse sectional View through the mixer frame and container, the plane of section being indicated by the line iib in Figure 4. Figure 6 is a fragmentary detail section of the dumping buckets within the mixing container.

Considered broadly, my invention comprises a mixing container mounted upon the ira-me of the mixer to tilt about what may be termed its transverse axis. Means are provided for agitating a charge of concrete within this container in such a manner as to cause it to tend to move longitudinally across this axis, thus producing a shift in the center of gravity of the container together with its charge. The stirring action is reversible, so that when the stirring its in one direction the center of gravity of the charge will shift to tilt the container into theA appropriate position for mixing and for transit, while stirring l or agitating'in the. opposite direction will move the center of gravity of the charge to the other end of the container, causing tilting of the con-- tainer into the appropriate position for dumping the charge. Means are provided for regulating this tilting action, this means preferably operating upon the hydraulic principle, and comprising a cylinder and piston connected between the container and the frame of the mixer. By permitting or preventing flow of liquid from this-cylinder the container may be permitted to tilt, or retained in any desired position. This gives unusually accurate control of the motion of the container, and operates the apparatus without the necessity for any auxiliary hoist or other equipment for the sole purpose of dumping, all of the power required being supplied by the mixing mechanism.

A preferred form of equipment embodying my invention comprises an automotive 'truck which is indicated by the'general reference character i. The truck includes the usual frame members 2, upon which are mounted a pair of bearings or hinges 3, which carry the tiltable super frame or cradle 1l. The conventional running gear of the truck need not be described in detail here, since it is oi familiar design.

Mounted upon the cradle are brackets 6 on which are journaled flanged rollers l. These rollers support a cylindrical mixing container or drum 8, around which run encircling tracks lil, so that the container may be rotated upon the rollers.

The container is rotated by power derived from the truck motor l l through a conventional power taire-olf l2, by which power is taken from the truck transmission gear I3. The take-off is controlled by a leverV lli, which may be operated when the clutch i5 is disengaged. 'Ihe clutch is also preferably arranged for operation by means of a lever l@ and link ll, connecting with the clutch pedal, the lever being mounted near the rear end of the truck. A similar dual control, operated by the lever it, connects through the link. 2t to the take-off lever It. In this manner, take-off can be operated either from the drivers seat or from the rear of the truck.

From the power take-off l2 a shaft 2l connects to a multispeed transmission gear 22 which includes a reversing gear. The driveny shaft of the transmission carries a universal joint 23, mounted on a splined shaft '25, which works in a sleeve 26 carrying a second universal joint 2l. This latter joint drives a short shaft 2Q, journaled in a pair of cross members 313, 3l on the cradle. The shaft carries a small sprocket 32, driving a chain 33, which passes around the drum'and meshes with a sprocket 35 formed on its periphery,to cause the drum to revolve upon its track. n

y Within the drum are a plurality of helically disposed baiiies or mixing blades 36. These blades preferably extend from adjacent the closed or forward end of the container, back to a row of buckets 39 which are disposed around the inner circumference of the container at the rear of its cylindrical portion. Beyond these buckets the container preferably has a short truncated conica-l end 4d, having a central opening fil.

As will be seen in the drawings (Figure 4) the buckets are so shaped that their under surfaces act substantially as continuations of the agitating blades carrying on the helical arrangement of the A pair of arms l2 ourye upward and backward from the of the cradle and a chute 44 is pivotally supported to these by a bracket d5. A lever permits the chute to be rot-ated so that projects into the opening of the container as shown, or to be swung out of the container and inverted above it.

The operation of the apparatus thus far described is as follows: The charge to be mixed is introduced into the cc" tainer through the chute. The container is then rotated in counter-clockwise direction as seen. from the rear, the desired speed being set by means of the transmission The helical mixing blades 32 agitate the material, at the same time carry it toward the forward end of the container, operating on the principle of the Archimedean screw. This overbalances the container so that the forward end tends to fall and the rear to rise, as shown by the dot and dash lines il in ure fl. is the position assumed by the container in transit.

When the container` is in this position, the tendency of the lades to shift the charge forward is augmented by gravity. The result is charge, instead of being spread out through the entire length of the drum, is concentrated in the forward end. This insures a more thorough mixture, and greatly reduces the time of agitation necessary to obtain a complete mix, 5 minutes stirring in the tilted container being approximately eguali lesults to l5 minutes when the container is liorilontal.

When it is desired to unload or dump the container, its direction of rotation is reversed by means of the transmission. The charge tends to shift toward the rear end ci the contai er, overbelancing the cradle so that the rear end tends to fall and the forward end to rise. rhis delivers the charge to the buckets due to the combined action of g a ating blades, and the buckets raise the material and drop it into the chute dfi, which discharges the miner.

The device would be opere ive even without means of controlling or regulanng tilting action, but pref to have this action completely under the control ci operator. is accomplished by means of hydraulic cylinders 59, .each of which trunnioned in the bearings 5I on the frame 2, and pistons pivotally attached to the cradle il, which work. in the cylinders. A line or conduit in which is included a Valve connects the two cylinders. A suitable hydraulic medium, preferably oil, nils the cylinders and line. When the valve is open the cradle and container are unbal need, the liquid is forced out of one cylinder into the other permitting the cradle to tip. lf valve be wholly closed, tilting ci the cradle entirely prevented, and the rate at which 'tilting talzes place can be controlled by partially openi g or closing the valve. A dual control for the Valve, operable from the driver-s position, is preferably provided in the lever 5l', which operates the valve handle through the link 59.

Although the cradle and container should be normally substantially in balance when empty, it is sometimes preferable to have a slight unbalance which would normally bring the container into the appropriate position for transit, i. e., with the forward end low and the rear end raised. There is therefore provided a box 56 attached to the forward end of the cradle. l/Vhen this box is empty the empty container and cradle are in balance, but the box may be lled with sand or other suitable material, in which case it acts as a counterweight of sumcient magnitude to tilt the empty container. Under these circumstances the container may be dumped as described, the valve being closed after it is brought to the dumping position. When the container is empty the valve may be opened, the forward end of the cradle then falling gradually to the position desired, and closed again with the container either horizontal as shown in ure l, or with the forward end low as shown in the dotted lines 4l of Figure 4.

I claim:

1. A vehicle for simultaneously mixing and transporting concrete and the like comprising a frame, a container tiltably mounted on said frame and substantially in balance thereon, agitating means within said container for mixing charges placed therein, a piston and cylinder connected between said container and frame for actuation by tilting of said container, and means for controlling fluid flo-w to and from said cylinder for regulating tilting movements 01 said container caused by unbalance thereof.

2. A vehicle for simultaneously mixing and transporting concrete and the like comprising a frame, a container tiltably mounted on said frame and substantially in balance thereon, agitating means within said container for mixing charges placed therein, cylinders and pistons connected between said container and frame on opposite sides of the tilting axis, a conduit connecting said cylinders, and means for controlling fluid flow between said cylinders to regulate tilting movement of said container.

3. A concrete mixer comprising a frame, a cradle tiltably mounted on said frame, a mixing' container rotatably mounted on said cradle, agitating blades helically arranged within said container, reversible means for rotating said container whereby a charge therein is simultaneously mixed and moved toward one end thereof by said helical blades, a cylinder and piston connected between said cradle and frame, and means for controlling fluid flow to and from said cylinder to regula e tilting movements of said frame.

4. A concrete mixer comprising a frame, a cradle tiltably mounted on said frame, a mixing container rotatably mounted on said cradle, agitating bla-desy helically arranged within said container, reversible means for rotating said container whereby a charge therein is simultaneously mixed and moved toward either end thereof by said helical blades dependent upon the direction of rotation of said container, a pair of cylinders and pistons, one of said cylinders and pistons being connected between each end thereof, a conduit joining said cylinders, and a valve in said conduit for controlling hydraulic flow between said cylinders for the purpose ofcontrolling the tipping action of said container'under the influence of an unbalanced load occasioned'. by the rotation of said container'.

HENRY PARIS.

said frame and said cradle aty