US1003088A - Concrete-mixer. - Google Patents

Description

H. M. GAPRON. CONCRETE MIXER. APPLIOATION FILED DEC. 29, 1909.

1 ,003,088. I Patented Sept. 12,1911.

3 SHEETS-SHEET 1.

H. M. CAPRON.

CONCRETE MIXER. nrmouron FILED 1230.29, 1909.

Patented Sept. 12, 1911.

3 SHEETS-SHEET 2.

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H. M. GAPRON.

CONCRETE MIXER.

APPLIOATION FILED 1130.29, 1909.

1,003,088. Patented Sept. 12,1911.

8 SHEETS-SHEET 3.

coumnui PLANOGRAPH CO..WASN1HOTON, D. r.

HORACE 1VL CAIE'RON, OF WINNETKA, ILLINOIS.

CONCRETE-MIXER.

Specification of Letters Patent.

Application filed December 29, 1909.

Patented Sept. 12, 1911.

Serial No. 525,402.

To all whom it may concern:

Be it known that I, HORACE M. CAPRON, a citizen of the United States, residing at Winnetka, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Concrete-Mixers, of which the following is a specification.

My invention relates to a concrete mixer of the sort in which the mixing chamber is formed by a revoluble drum or barrel, into one end of which the constituents of the concrete are fed and from the other end of which the mixed concrete is discharged by means of a discharge chute.

One of the principal objects of my invention is to provide an improved form of drum which shall be simple, strong and durable in its construction.

The invention has for further objects such other new and improved constructions, arrangements and devices in concrete mixers as will be described in the following specification and particularly set forth in the claims appended thereto.

The invention in a preferred embodiment is illustrated in the accompanying drawings, wherein Figure 1 is an elevation of the discharge end of the device. Fig. 2 a sectional view taken on line 22 of Fig. 1. Fig. 3 a detail section through one pair of the bearing rollers and associated parts. Fig. 4 a view in perspective of the discharge chute. Fig. 5 an enlarged sectional view through one of the tracks and adjacent parts. Fig. 6 is a detail view illustrating the means for tilting the scoop.

Like characters of reference indicate like parts in the several figures of the drawings.

Referring to the drawings, the drum is composed preferably of a central annular member 10, preferably a casting, and of the end pieces 11 and 12 which are preferably made of sheet metal. On the member 10, preferably cast integrally therewith, is a rack 13 with which a driving pinion 14 meshes, for the purpose of revolving the drum. Any desired means may be employed for driving the pinion 14, and as such means, in itself, forms no part of my invention, the same is not shown nor described herein.

The drum is revolubly supported upon the bearing rollers 15. It is usual in apparatus of this sort to provide the drum with circuand durable tracks which will not become bent, displaced or easily worn, I form the tracks, indicated at 16, 16 in the drawings, of rails, preferably, rails of T sect-ion, which are given a circular form, and the flanges of which are riveted, as shown at 17 or otherwise secured to the central member 10 and to the adjacent edge of the end piece 11 or 12, as the case may be. In order to make a firm joint the annular member 10 is preferably formed with the flanges 18 of reduced thickness, the flanges of the rails 16 abutting against the shoulder formed by this reduction in thickness of said member. The ends of the rails constituting the tracks 16 may, of course, be welded or otherwise secured together to make a good joint. Preferably, the end pieces 11 and 12 are formed at the feed opening 19 and discharge opening 20 with the outwardly turned flanges 21 to which may be secured the angle pieces 21. This construction prevents the dripping of the concrete around the sides of the drum, which has often resulted in the clogging of the driving mechanism of concrete mixers of this general sort and which tends to wear out the parts. The drum is supported on four bearing rollers 15 which are preferably flanged wheels revolubly mounted in pairs on the axles 22 which may be supported in any desired manner, for example, by the brackets 28 which are bolted to the timbers 24, the latter being secured to the timbers 25. It is obvious that any other form of supporting frame or structure might be used in place of that above described. The axles 22 are shown as secured to the brackets by means of the set screws 25. A spacer 26 is interposed between the wheels on each axle. The wheels are prevented from separating because of the engagement of their flanges with the tracks 16. The arrangement of the wheels and axles is a preferred arrangement but might be considerably modified.

The constituents of the concrete are fed into the drum by means of a feed hopper 27 which extends into the opening 19 and is supported from the timbers 24 by brackets with any desired means for mixing the con crete. But I have shown in Fig. 2 a pre-' ferred arrangement of mixing devices, in accordance with which two sets or series of mixing scoops 30, are provided. The scoops 30 are longer than the scoops 30 and the two sets of scoops are oppositely inclined a longscoop being arranged opposite each short scoop, as shown. Arranged below the lower-crdischarge ends of ,each pair.

of scoopsBQ, 30 is .21. preferably horizontally placed bucket 31, these buckets in the arangemen s sl wnin gb ing o d.

at the discharge.side of the drum. Preferably, .they are arranged so that as the drum tents into the discharge chute 32 when the same is in the dotted line positionshow-n in Fig. 2

In ,concrete mixers provided with disterior of thedrum so as to receive-the mixed concrete o-r-the m xing ;dev1ces on the inner surface -of the drum, it has been customary. to nialre the discharge chute of uniform.

width, and, -as the discharge 7 opening through which the chute projects must be of a relatively small diameter, it has been found that the discharge from mixers of this character is often too slow, due to the fact that the chute catches too smalla pro portion of the contents of the drum. I, thereforaconstruct my discharge chute 32in the tapered form shown in Fig. 4, that is, with its inner end wider than its discharge v.end, and wider, in fact, than the diameter of the discharge opening 20). By thus increasing the size of the chute at the place where the concrete ;iscollected the discharge I of the concrete is made more rapid. In ;order toget the chute into thedrum I preferably construct the same ,of two longitudinal sections 33 and 34, these sections being secured together, after being put through the discharge opening, by means ofthe riveted or bolted straps 35 or otherwise. Preferably, the chute is formed with the side of the same .36 which is opposed to the rotation of the drum higher than the-.oppositeside37. The chute has bolted {thereto the lugs 38, by means of which it is rigidly secured to a shaft 39 mounted in the uprights 40, which shaftis provided with a pinion 41 of relatively large diameter, with which is meshed a smaller pinion 42 'on a :short shaft 43 .to which is connected be provided which engages with a pin 46 :on the handle '44, for holding .the handle 44 revolves they successively dump their con charge chutes which project into the in-.

when the chute is in its discharging position.

The operation of my mixing machine is as follows: The ingredients of the concretecement, stone, water, sand, etc.are introduced into the drum through the feed hopper 27 and are mixed together by the revolution of the drum and by the mixing action of the scoops and buckets. In the arrangement of the latter devices shown in Fig. 2, the mixture at the ends of the drum is picked up by the scoops 30, 30" and deposited on the buckets 31 from whichapart at least drops into the chute provided the latter be in the dotted line position shown in this figure. The rest of the concrete drops Shack into the bottom of the drum and is mixed with the new ingredients which are being constantly fed into the drum through ;the feed hopper 27 It-will be seen that the ,curved form of the ends of the drum tends to cause the concrete to enter the scoops 30 .or 30 as the case may be, and that the {buckets 31, which receive the concrete from ;the scoop, are arranged directly above the ;end of the discharge chute.

The concrete may, of course, be given an initial mixing before it is begun to be discharged from the drum, in which case the chute will be tilted to the position shown in the full lines of Fig. 2.

The rails l6 afford means for securing to- ,gether the parts of the drum, act as reinforcements to the drum, and, at the same ;time, provide tracks for sustaining the drum onthe roller 17 which are verystrong ,and durable, so that the drum is sure .to ,run true.

I do not claim broadly a circular track unade of a T section rail, or the combination of such a track with the drum of a concrete mixer, or other revoluble element, as gtlllS subject matter has been divided out of .the present application and is made the sub- ;ject of my pending application Serial N 0. 609,712 filed February 20, 1911, which is a continuation of the present application in this regard.

I claim:

1. In apparatus of the character described, the combination with bearing rollers, of a drum comprising a central annujlar member and end members, and circular tracks consisting of rails of T section which revolubly support the drum on the rollers and to the flanges of which are secured the abutting edges of the annular member and theend members.

2. In concrete ,mixing apparatus,.the combination with a revoluble drum formed on one side with a feed opening and on the other side with a discharge opening, of a plurality of short concaved scoops arranged on the interior of-the drum on the discharge side thereof, said scoops being arranged obliquely so that they deliver toward the cenarranged on the discharge side of the drum ter of the drum, a plurality of concaved under the discharge ends of said scoops, scoops of greater length on the charging substantially as described. side of the drum, said last mentioned scoops HORACE M. OAPRON.

5 being obliquely arranged so that they de- WVitnesses: 7 liver toward the delivery ends of the first P. H. TRUMAN, mentioned scoops, and a plurality of buckets H. L. PEoK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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