US 2136045 A
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Description (OCR text may contain errors)
Nov. 8, 1938. J. P. FA BER CONCRETE IIXER WITH TWb CQMPARTMENT DRUM 2 Sheets-Sheet 1 Filed Nov. 9, 1 935 INVENTOR. at-(4,
Nov. 8, 1938; v J.- P. FABER CONCRETE MIXER WITH TWO COMPARTMENT DRUM 2 Sheets-Sheet 2 Filed Nov. 9, 1935 l mhll.
Patented Nov. 8, 1938 CONCRETE MENT John P. Faber, 'nunenen, N. J., some Concrete Machinery field, N. J., a corporati Application November 9,
4 Claims. '(Cl. 259-164) The present improvements relate in general to concrete mixers and more particularly to that type of mixer wherein the ingredients of the batch are mixed in two compartments of a sin- 5 gle drum, and are in the nature'of an improvement in the co-pending application of James E. Bushnell and John P. Faber, Serial No. 632,878, filed September 13, 1932,
In former practice, the batch of ingredients for the mixing and placing of concrete comprising among others, sand, cement, crushed stone gravel, water, etc., was mixed in a drum for a prescribed interval and thereupon discharged. Such a structure imposes limitations on the capacity of the mixer. It is therefore an object of the present improvements to provide an improved single drum unit which increases the output of batches above sixty percent and improves the quality of the mix".
It is a further object of the present improvements to provide improved means and methods of charging, mixing and batch into and out of each of a plurality of mixing compartments in a single drum.
Novel means and methods are furthermore provided for charging, mixing, and discharging a concrete batch into and out of each of a plurality of mixing compartments in a single drum, while maintaining the rotary mixing movement of the ingredients. Accordingly, the improvements provide for the rotary mixing of the aggregate, water, etc., from the moment the first ingredients enter the first compartment, thence without interruption until the last compartment is discharged. The rotary mixing is therefore not interrupted but actually continues during transfer of the batch from one compartment to an- .other. g
A further object is to provide a novel type of mixing drum, having a plurality of compartments, whereby a batch may be mixed for part time in each compartment, so that while one batch is receiving its final partial mixing in the last compartment, another complete batch may be simultaneously receiving its initial partial mixing in the first compartment. v
Another object is to provide an improved type of mechanism for transferring the partially mixed batch from one compartment to another, as well as an improved means for preventing transfer between such compartments. A further object is to provide novel mixing blades for transferring the batch from one compartment to another as well as a novel door or battle for preventing transsingle compartment discharging a concrete MIXER wrrn 'rwo coMrARn DRUM assignor to Ban- Company, Plainon of New Jersey 1935, Serial No. 49,022
fer, but likewise functioning in the operation cycle when open or closed.
An additional object is to provide an improved mechanism for accomplishing a continuous cycle of operation, including charging, mixing, transferring, mixingagain and discharging a succession of batches in a series of compartments in a single drum unit.
' Another object is to provide a novel reinforcement means for the blades, and also to provide a novel support for the closure or baffle.
A further object is to provide novel means and methods for operating a double-compartment drum.
Other objects include improvements in details of construction of double-compartment drums and in methods of their operation. Further advantages-and objects of the improvements will be apparent to those skilled in the art upon reference to the accompanying specification and drawings, in which-- Fig. ,1 is a longitudinal section through the mixer illustrating one embodiment of the improvements;
Fig. 2 is a section on line 2-4 of Fig. 1;
Fig. 3 is a section on line 3-3 of Fig. 1;
Fig. 4 is a section on line 4-4 of Fig. 1;
Fig. 5 is a diagrammatic showing of a modification, in plan view.
Referring to the drawings, the single rotary mixing drum 5 is provided with bearing bands or rings 6 upon which the drum revolves, being supported on a set of four bearings or supporting rollers (not shown). The drum is driven by a suitable power unit (not shown) through gearing in mesh with ring gear 1, fixed about the circumference of the drum, all as is common in the art.
The drum is equipped with the usual charging inlet 8, discharging outlet 9 and a transverse partition l which divides the drum into two mixing compartments H and I2. An opening I4 is provided in partition H] for affording communication between the two compartments.
As illustrated the first compartment H may be provided with a series of mixing blades l and a series of mixing and transferring blades l6, while the second compartment isprovided with a series of mixing blades l1. Any suitable charging means for the drum may be employed.
' In the illustrated embodiment the usual pivoted skip I8 is provided for introducing the dry aggregates, such as sand, cement, crushed stone and the like, into the first compartment II. A
ter with the aforementioned batch.
' in the bafiie or closure 20. As illustrated, this element is preferably in the form of a slidable door which may be reciprocated longitudinally of the drum. It is obvious that such a door may be madeto slide across the opening I4, in a plane parallel to partition I0, if desired, without departing from the improvements.
The door 20 is preferably carried on an actuating rod 2| which extends to the exterior of the drum where it is operatively connected by levers 22 and rods 23 to a power discharge mechanism 24 of a type, such as that set forth in the patent to Shafer 1,415,411 of May 9, 1922. In' this manner the door 20 may be advanced and retracted from full to dotted line position and return, as desired, for opening or closing the opening I4. The transfer of the batch from compartment II to compartment I2 may thus be permitted or prevented.
A reinforcement in the form of a collar 25 is flanged and secured to the adjacent tips of transfer blades I6 (see Figs. 1 and 2). This element serves to reinforce and support the tips or free edges of the transfer blades which are adjacent the axis of the drum where they direct the batch through opening I4. Part of the most severe burden inflicted on blades I6, is imposed on them at this region, and the provision of the reinforcement 25 therefore affords a more rugged and durable construction. The vitality and efiiciency of the unit as a whole, is greatly increased.
In order to facilitate the operation, the door 20 is partially supported on collar 25 and bearing 26 by means of rod 2I.
on rod 2| so that the closure may rotate with the may be described as follows:
With the drum 5 rotating with the parts in full line position in Fig. 1, compartment II is-empty and chute I9 is in the position for discharging and emptying compartment I2. Upon pulling handle 5|, whereby the skip I8 is charged into the mixing blades I5 of The batch is mixed in the rotatmg compartment II by the combined action of blades I5 and I6. The former mix the batch and advance it toward the central region of the compartment and blades I6 pick it up there and further mix and advance the batch toward outlet 2,136,045 conduit 29 is usually provided for supplying wai The drum is discharged by means of the chute,
I4. As shown by the arrow, the batch impinges the baflle or closure 20 and is returned to the compartment II for further'mixing. The elements I 5, I6 and 20 therefore give the batch a thorough mix by transferring it back and forth during the mixing operation,
When the batch has been given the predetermined partial mixing which it is to receive in compartment I I, the batch meter or timer 50 releases the mechanism which automatically operates and withdraws chute I9 from full to dotted line (closed) position. Thereupon mechanism is released which automatically operates member 24 for retracting closure 20 from full to dotted line (open) position. The drum 5 is rotating and the batch in I I is being mixed therein, and the blades I6, while turning and mixing, direct and transfer the batch through opening I4 into the region of the rotating blades I! in compartment I2. Without interruption in the mixing of the batch, the blades I! pick up the batch and it thereupon is mixed by them in compartment I2.
The power discharge mechanism 24 thereupon retracts door 20 to closed position and then skip I8 feeds a new batch into compartment II. This new batch is given its initial partial mixing in compartment II, and concurrently, the first batch is receiving its final partial mixing in compartment I2. The blades I! mix the batch and advance it toward the middle and end of the compartment. When the prescribed partial mixi is completed in compartment I2, the batch has been mixed for the full mixing interval required by building or highway specifications. The batch has received a half mix" in each compartment, the total of which is the mix in a single compartment drum.
At this stage, the drum carries one completely mixed batch in compartment I 2, and one partially mixed batch in compartment II. The power discharge mechanism (not shown) now swings chute I9 into discharging position (full line) whereupon batch #1 is discharged entirely from the drum. By the time this operation is cqmpleted, the partial mixing of batch #2 is accomplished in compartment I I, so that the door 20 is opened and chute I9 withdrawn, whereupon batch #2 is transferred into compartment I 2.
It is therefore seen that the operators attendbatch #1 is completed (the proper interval hav-' ing lapsed) the batch meter unlocks or releases the power discharge mechanisms and the operator may then cause the chute I9 to be swung out of compartment I2, and cause the door 20 to move into said compartment for uncovering opening M. The parts are now in batch-transferring position and blades I6 transfer the batch into the region of mixing blades I! in compartment I 2. The door 20 may be thereupon closed and the operator may again actuate the mechanism for equivalent of one full erator may 'elevate be omitted if desired. In preferred embodiments, a disheddoor with a single sealing flange, as
elevating the skip with another batch, and for discharging compartment II by swinging chute [9 into same.
It may be found preferable to employ two batch meters, one with each power discharge mechanism. In such an arrangement, the opthe skip for charging compartment ll, whereupon the batch meter is set so as to lock closure for the prescribed mixing interval for compartment H, upon completion of which the power discharge mechanism controlling the closure is released and the operator may for example, like a single drum mixer..
'ample, the door 20' may actuate a lever for'retracting the closure. The discharge chute I9 is similarly locked by a second batch meter which upon completion of the mixing interval in compartment l2, releases the -power discharge mechanism whereupon the optransferred and mixed in the second. The chute compartment I I .in the mixing operation along with the blades in tageous since it secures i9 may' then be operated for discharging the completely mixed batch. 0n the other hand, -a different operation may be followed wherein the chute l9 may be kept in discharging position, and a full mixing of the batch may be accomplished in compartment H with door 2!! closed. The door may then be opened for transferring the batch to compartment l2 whence it is discharged as soon as blades l'l advance it to the chute 19.
g It is significant that the blades in the first compartment act as mixing and transfer blades and direct the aggregates toward and downwardly into the blades in the second compartment so that even though partial mixing is accomplished in isolated compartments, the mixing goes on uninterruptedly before, during and after transfer. The character of the mixing operation in may be different fromlthat in compartment 12, due to the difference of movement of the materials in each compartment. Furthermore, the participation of the door 20 the center of the drum insures better and quicker mixing, "and the presence of the door contributes to the improved quality of the batch.
The reinforcing collar is particularly advan the tips of the mixingtransfer blades l6 together, and through .the rod II and door 20, the partition I0 and blades l6 are braced and reinforced one by the other.
In providing the battle or closure 20 the separation of the aggregates entering compartment I2 is prevented by breaking their fall. It also may retard the movement of aggregates fromthe door to the discharge chute. The closure 20 thus permits the simultaneous movement of the discharge chute to closed position and the closure to open or' transferring position without danger of premature discharge of any portion of the partly mixed batch entering the second compartment from the first, and enables the opera.-
.tor to increase the speed of the operation. A
skirt 5 maybe provided on the sealing flange of closure 20, for protecting the opening, but may i a discharge means and a connecting device whereby said member 8. In a single seen in outline in Fig. 5, is employed.
A slightly modified form is diagrammatically supported by collar extends through the housing M. the entire drum and extends from actuating clo- 22 The housing 2| the whole is partially 25. A bifurcated support ill and through either end thereof where it is fixedly supported on the mixer frame. The support 10 insures alignment of the door and opening, of sagging of the I claim: 1. A single drum transverse partition and a second compartment and prevents any possibility door or its actuating means.
concrete mixing machine, a defining a first compartment for partially mixing batches of concrete in each, said partition having 20 a discharge opening, mixing blades in each of said compartments, compartment cement, a movable opening, discharging blades for impelling the parthrough the opening obstructed tially mixed batch means for charging said first with water, sand, dry aggregate and door normally closing said by said door, a member operable from the exterior of said drum for opening said door and moving it into said second compartment whereby the partially mixed door are supported batch may for said second, compartment,
be transferred and and by said, discharging blades said device also forming a connection between said blades.
2. A single drum transverse partition concrete mixing machine, a defining a first compartment and a second compartment for partially mixing batches of concrete in each, said partition having a discharge opening,
said compartments, compartment with and cement, a reciprocating discharging said opening, the partially mixed obstructed by said door,
bearing and connecting said blades, a
mixing blades in each of means for charging said first water, sand, dry aggregate door normally closing blades'for impelling batch through the opening a bearing supported by joined to said member supported by said bearing and operable from the exterior of the drum said door whereby the partially for supporting and opening mixed batch may be transferred to said second compartment, and a discharge means for having a transverse said second compartment.
drum concrete mixing machine partition defining two commixing batches of concrete and a discharge opening in said partition through which said partially mixed batches are transferred from one compartment to the other,
the combination of both compartments, tially mixed batch from the compartment and for separating the for mixing batches in transferring a parfirst to the second batches in means means for the two compartments during non-transferring periods, means extending to the exterior of the .drum and connected means in the separating moving the saidmeans with said transferring and interior of the drum for and a bearing support for said moving means mounted in one of said compartments and connected with and rigidly connecting certain elements of said mixing means, to
form therewith a unitary structure.
4. In a single drum concrete having a transverse partments for part1 mixing machine partition defining two comally mixing batches of con,
crete and a discharge opening in said partition through which said partially mixed batchesare transferred from one compartment to the other, the combination-of means for mixing batches in both compartments, means for transferring a partially mixed batch from the first to the second compartment and for separating the batches in the two compartments during non-transferring means extending to the exterior of the 10 drum and'connected with said transferring and periods,
separating means in the interior of the drum for moving thesaid means and a bearing support for said moving means mounted in one of said compartments and connected with and rigidly connecting certain elements of said mixing means, to form therewith a unitary structure, said structure also supporting said transferring and separating means.
JOHN P. FABER.