US1692280A - Concrete mixer - Google Patents

Description

G. ROUTLEDGE ET AL Nov, 20, 1928.

CONCRETE MIXER Filed May 14, 1928 ENTORS:

A FTBRNEY Patented Nov. 20, 1928.

UNITED STATES PATENT? OFFICE. f

GERALD ROUTLEDGE, or oAxLANn'ANn AXEL o. NORLING, or ALAMEIDA, CALIFOR- NIA, ASSIGNORS 'ro HUTCHINSON co, 0F OAKLAND, CALIFORNIA, a CORPORATION.

ooNoRETE MIXER.

Application filed y 14,

tion extending into the drum body and is pro vided with a plurality of perforations through which the water is forced to the'drum interior to be combined with the contents thereof by the revolvingraction of the drum,

Due to the clogging of these perforations by particles of cement, sand, and small stones contained in the mixer, it is often impossible to force sufficient water through these'perforations and into the contents of the drum, which causes improper mixing of the contents and the consequent shutting down of the machine until the drum supply pipe can be cleaned. i 7

Our improved device consists of a small screw conveyer secured at one end to'the interior wall of the mixing drum and adapted to revolve therewith with its free end projecting into the stationarywater supplypipe' in such manner that the interior of said pipe will be kept clear of all foreign matter which may enter by ways of the pipe perforations, the perforations themselves being also keptclear and the water in the pipe thus kept flowing freely the full length thereof, thereby causing an even distribution of waterto the mix within the revolving drum. I

The primary object of our invention is the provisionof improved conveyor means adapted for positioning in the water supply pipe of a concrete mixer drum and for rotation with said drum in such manner that the supply pipe will at all times be kept clear of any and all foreign matter which may become lodged in the porforations thereof, thus tending to provide for even and proper distribution of water to the mix at all times. i

Another object of our invention is to'provide a simple and eflicient conveyer device for concrete mixers which may be easily applied to ordinary forms of mixers and which will function in a. positive manner to properly distribute water to the interior thereof to insure continuous and proper operation of the mixing drum.

Other objects and advantages of our invention will be apparent with reference to the 1928.4 serial No. 277.775.

subjoined detailed description taken in connection with the accompanying one sheet of drawings, in which Figure 1 is an axial section illustrating a common form of concrete mixer and showing our improved screw conveyor in position within the water supply pipe of the revolving drum. The view also includes the driving means for the mixer, also its roller supports Figure 2 is an enlarged sectional detail showing the mixer end of the screw conveyor and the outer end of the water supply pipe in which it is mounted for rotation relative to such pipe;

Referring with greater particularly to the drawings, thenumeral 5 designates the mixer in a: general way, which comprises in detail, the usual revoluble drum 6 having interior arranged vanes 7 adapted to agitate the contents of the drum, One end of the drum '6 is provided with the usual cone shaped section 8 and opening 9 and the opposite end-is provided with an axial bearing member 10 surrounding thewater feed pipe 11. The drum 6 is rotata-bly mounted upon rollers 12 and 13 which carry its \veight so that it may be rotated about the axially disposed pipe 11 which projects into the drum and is held stationary relative thereto in the usual manner.

The drum is provided at its rear end with the usual annularly arranged rack; 14 which meshes with a driving pinion 15 carried by the driving mechanism 16, through which means rotation of the mixing drum is accomplished in the usual manner. The supply line 17 communicates with the horizontally disposed pipe 11 and both are held rigid and against rotation in any suitable manner not shown. 1 a

Our improved conveyer member 18 comprises, an elongated screw member 19 mounted in the pipe section 11 and extending throughout its entire length, said screw being preferably formed from a single piece of twisted metal and having a stem 20 at its outer end extending through the cap 21, which forms a bearing therefor, and is rigidly secured to the drum end 4 by means of a spider or the like, 22 having a centrally disposed hub 23 for its reception and to which it is rigidly secured by means of a set screw 24:.

When in operation, the drum 6 is rotated about the stationary pipe 11 by the driving means 16, which rotary movement causes the V rotation of the spider 22 and screw 19 and ing into said pipe, and adapted to facilitate the consequent-rotation of the screw within the pipe 11. This rotary motionof the screw 19 tends to dislodge particles of cement which.

The above described rotary movement of the screw 19 continues as long as the drum this in operation and this continuous motion of the screw causes the agitation of the water column in the pipe 11 and assists the even distribution of the water to the various perforations 25 arranged the whole length. of

the pipe 11 and also carries the larger par-- ticles of foreign matter to the end slot 26 at; which point they are dischargedinto the m1x.

act terms required by law, and believing that it comprises novel, useful andvaluable improvements in the art to which it pertains, we here state that we do not wish to be limited to the precise construction and arrangement of the several parts, as-herein-set forth, as the same maybe variously modified by a skilled mechanic without departing from the spirit andscope of our invention as'defined in the appended claims.

WVhat we claim and following, to wit 7 1. A concrete mixer having a revoluble drum and a water supply pipe and a screw conveyer carried by said drum and extendthe distribution of water to said drum; I

2. A concrete mixer having a-reyoluble drum, a stationary water supply pipe ar-' Having thus described our invention, andan embodiment of 1t,1n the full, clear andexdesire to secure by Letters Patent of the United States, is the esaeso ter column therein to facilitate its distribution to said perforations. and to prevent the clogging thereof by particles from the agitated mix n said drum. 3 p

3. In combination with a concrete mixer having a revoluble drum rotatable about a carried by theouter end thereof, and means for rotating said drum and screw member.

to cause the agitation ofthe Water column in said pipe and the even distribution thereof to the various perforations and the simultaneous dislodgment off -particles of cement and gravel therefrom. V

4:. In a-device of the class described, a stationarywater supply: pipe and a mixing drunr mounted for rotation thereon, means n the form of ascrew. carried by one endot' said drum and adapted for rotary action inusaid pipe, discharge perforations arranged in spacedrelationthroughout the length of said pipe and a slot arranged in oneend thereof, and means for rotatin said drum and screw to cause the forcing of water along Said pipe.

and through spaced perforations/ 5. In a device of the class described, a stationary hollow water supply pipe having .a cap at oneendand connected at its opposite end to a suitable supply source, said pipe being provided with evenly spaced preforations and said cap with a slot, and a screw'member extending throughsaid and adapted for rotary motion infsaid pipe to evenly distribute. the water column in said pipe to the perforat-ions therein and tocause the discharge.

through. said slot of all foreign particles which may enter said perforations from exterior sources. i J p In testimony that we claim the foregoing we have hereto set our hands this 4th day of May; v

GERALD noUTLnDsn. AXEL o, uonmne.

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