US2286840A - Concrete mixer - Google Patents

Description

b. SHECK CONCRETE MIXER June 16 1942.,

Filed Mar'ch 15, 1940 4 Sheets-Sheet 1 u MENTOR.

A'IY'LTORNEY5 June 16, 1942. o. SHECK 2,286,840

CONCRETE MIXER Filed March 15. 1940 4 Sheets-Sheet 2 g INV NTORQ BY ATTORNEY5 3mm E6 1420 0. SHECK concnm'm MIXER Filed March 15, 1940 4 Sheets-Sheet 5 INVENTOR.

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ATTORNEY fiune 36, E42. 9, $HEK 2 286 840 CONCRETE MIXER Filed March 15, 1940 4 Sheets-Sheet 4 gnaw/whom Oscar J/zec/r Patented June 16, 1942 2,Ztt,840

CONCRETE MDKER Oscar Shock,

Milwaukee, Wis,

assignor to Koehring Company, Milwaukee, Wis, a corporation Application March 15, 1940, Serial No. 324,196

17 Claims.

This invention has to do with concrete mixing machines of the type embodying plural, double, or drum constructions, in which concrete aggregates are first introduced into a mixing drum or chamber and partially mixed therein, thereafter transferred to a second mixing drum or chamber, wherein the mixing operation is completed, the aggregates then being finally discharged from the second chamber. More particularly, the invention relates to improvements in the control mechanism for automatically controlling the time of mixing in a mixing machine wherein the mixing of the concrete aggregates is carried on simultaneously in a plurality of mixing compartments.

In concrete mixing machines of the character referred to wherein the mixing is carried on simultaneously in a plurality of compartments, there is usually employed automatic timing control mechanism set in operation by the charging means to control after a predetermined period following the charging of the first chamber first a discharge of the aggregates in the second chamber and immediately thereafter a transfer of the partially mixed aggregates from the first to the second chamber for a final mixing action. Heretofore, in order to effect a timing control of the mixing of the aggregates transferred to the second chamber, it has been necessary to operate the charging means to reset the automatic control mechanism. However, in certain cases as where the operation of the mixing machine is being shut down, the charging means is not operated and there is no timing control of the mixing in the second chamber to which aggregates have been transferred. Since it is necessary to provide means for discharging such aggregates, there has existed the possibility of discharging such aggregates without having been mixed for the proper prescribed period of time.

It is desirable, in machines of this type, that manual operation of the concrete aggregate transferring and discharging mechanism be eliminated entirely since manual operation usually involves a time lag which cuts down the possible production of the machine. However, in the provision of automatic control mechanism it is desirable to provide manual means for interrupting the automatic control and for effecting a manual operation of the discharge means. In the case where it is not desired to immediately discharge all of the contents of the second chamber, it is desirable to return the discharge means to non-discharging position and to then effect a second discharge of the aggregates remaining therein. Heretofore, the automatic control mechanism Which provided for manual control of the transfer and discharge means has not been operative at all times to absolutely control the time of mixing of aggregates in the plural mixing chambers. This Was particularly true With respect to the aggregates transferred to the second mixing drum for a final mixing operation since the timing control of the mixing of such aggregates was dependent upon the operation of the charging means to charge another batch of aggregates into the first mixing chamber.

Accordingly, one of the principal objects of this invention is to provide automatic control mechanism for a mixing machine having a plurality of mixing compartments which will be effective to assure mixing for a prescribed period in each of the compartments and prevent discharge of the concrete aggregates from the mixing compartments prior to the prescribed period of time of mixing.

A further object is to provide batchmeter control mechanism which will be effective to prevent discharge from the final mixing chamber under any condition prior to the expiration of the prescribed period of mixing time therein.

A further object is to provide automatic batchmeter control mechanism which will be operative to automatically effect a second automatic timing control of the mechanism employed for effecting a discharge of the contents of the final mixing compartment Without the necessity of resetting thebatchmeter to time the period of mixing in the final mixing compartment.

A further object is to provide control instrumentalities operable to interrupt the automatic control action of the batchmeter after the same has operated to start an automatic discharge of the contents of the final mixing compartment and permit manual operation of the discharge mechanism to non-discharging position and return to discharging position so as to permit splitting of the batches which have been mixed for a prescribed period of time.

Other objects and advantages of the invention will become apparent during the course of the following description.

In the drawings, there is show-n a preferred embodiment of the invention. In this showing:

Figure 1 is a substantially vertical sectional view of a concrete mixing machine or paver having a pair of separate mixing compartments and showing the arrangement of the charging, transfer-ring, and discharging mechanism, together with the control devices therefor.

Figure 2 is a front elevational view of a batchmeter, parts of the casing thereof being omitted to show the control instrumentalities by which the various operations of the mixing machine are carried out.

Figure 3 is a side elevational view of the mechanism shown in Figure 2, part of the control instrumentalities being shown in dotted lines.

Figure 4 is an enlarged diagrammatic detail side elevational view of parts of the control mechanism shown in dotted lines in Figure 3.

Figure 5 is a top plan view of the manual control levers; and

Figure 6 is a vertical sectional view taken on the line 6-45 of Figure 2 and lookingin the direction of the arrows.

Referring to Figure l of the drawings, the numeral l indicates a mixing machine having separate mixing compartments 2 and 3 separated by a partition 4 having an opening 5 therein through which concrete aggregates may be transferred from the compartment 2 to the compartment 3. The compartment 2 is provided With a charging opening 6 through which concrete aggregates may be charged by a skip 1 into the compartment 2. Upon operation of the skip 1 to charge the compartment 2 with concrete aggregates, a roller 3 on the skip 1 is adapted to con tact levers 9 to operate water control devices (not shown.) for admitting water into the compartment 2 in a manner well known in the art.

A transfer chute I is provided for transferring partially mixed concrete aggregates from the compartment 2 to the compartment 3. A discharge chute II is provided for discharging the completely mixed aggregates from the final mixing compartment 3 through the discharge opening I2. A fluid power or hydraulic motor I3 is provided for moving the transfer chute I0 back and forth between its non-transferring position shown in solid lines to its transferring position shown in dotted lines. Likewise, a fluid power or hydraulic motor I4 is provided for moving the discharge chute II back and forth between its discharging position shown in solid lines and its non-discharging position shown in dotted lines. The construction of the transfer chute I0 is preferably of the type shown and described in Letters Patent No. 2,167,243 issued to E. H. Lichtenberg and Oscar Sheck.

The motor I3 is connected by conduits I5 to a transfer control valve I6 which is operable to control the action of the motor I3 to effect the desired operation of the transfer chute ID. The motor 14 is likewise connected by the conduits I1 to a discharge control valve I8 which is operable to control the action of the motor I4 to effect the desired movement of the discharged chute II. An auxiliary motor I9 is associated with the control valve l8 and is connected by a conduit 21] to one of the conduits l5 so that upon operation of the transfer control valve I6 to admit fluid pressure to the motor l3 to effect movement of the transfer chute to transferring position, fluid pressure will also be admitted to the auxiliary motor I9 to operate the discharge control valve l8 to effect a return of the discharge valve I8 and to effect a return of the discharge chute II to nondischarging position.

The construction of the parts thus far described are well known in the art and form no part per se of this invention, such parts being more fully set forth and described in my copending application, Serial No. 212,834, filed June 9th, 1938, now Patent No. 2,224,801, issued December 10, 1940. It will be understood that the novel features of this invention lie mainly in the improved control features of the batchmeter indicated as a whole by the numeral 2| which is conected by an operating member 22 to the discharge control valve I8 and by an operating member 23 to the transfer control valve I6. As is the case in my copending application, the batchmeter ZI is adapted to'be reset by the rod 24 which is actuated upon the movement of the charging skip 1 to its charging position.

The construction of the parts of the batchmeter indicated by the numeral 21 in Figure 1 is shown in Figure 2 and it will be understood that the construction and operation of certain of these parts is generally similar to the batchmeter c-onstruction illustrated in Patent No. 1,451,483 issued to H. O. Winkler and to the batchmeter construction disclosed in my aforementioned application. The aforementioned Winkler patent is relied on for a more detailed showing of these parts, and for the purpose of this description, it will be sufficient to set forth that the batchmeter resetting rod 24 is connected to the batchmeter resetting arm 25 by a connecting member 25, the member 26 being a crank mounted on a shaft carrying the resetting arm 25. Operation of the rod 24 by the skip 1 will impart a counterclockwise movement to the resetting arm 25 which will impart an upward movement to a weight 26. Downward movement of the weight 25 and certain actuating devices to be described is limited by an escapement timing mechanism 21. Operation of the resetting arm 25 is resisted by a spring 28, and a counter device 29 has a connection with the resetting arm 25 to keep track of the number of times the skip is operated to reset the batchmeter.

The discharge valve l8 and its operating member 22 are connected to an actuating arm 30 which is in turn connected to the discharge control 3| by a shaft 32 to which both the operating arm 33 and control member 3| are keyed. The control member 3| is locked in the position shown in Figure 2 by means of a pivoted trip lever 33 and is moved to such position against the influence of a spring 34. It will be understood that with the parts in the position shown.

will maintain the discharge control valve I8 and discharge chute II in non-discharging position.

The transfer control Valve and its operating member 23 are connected to a control member 35 which is held in the position shown in Figure 2 against the action of a spring 36 by means of a pivoted locking device 31, the locking device 31 having a detent 38 for engagement with a lug 39 on the transfer control member 35. The control member 35 is moved to theposition shown in Figure 2 against the action of the spring 36 and in such position, it will be understood that the transfer control valve IE will maintain the transfer chute I5 in its non-transferring position.

The pivotally mounted trip member 45 is connected by a rod ll to the locking member 31, the trip lever 45 being biased by a spring II to a position maintaining the detent 33 in engagement with thecontrol member 35. A transfer resetting member 42 is connected to the resetting arm 25 and is provided with a pin and slot connection 43 to the transfer control member 35 for moving the member 35 to its down position shown in Figure 2 and for returning the transf r chute to non-transferring position upon operation of the skip 1 to reset the batchmeter. The pin 43a The member 5'! is pivotally connected to a link 59 which in turn is connected to a member 60 pivotally secured to the casing of the batchmeter. The member 60 carries an abutment GI and upon movement of the member 51 to its upper position with the abutment 58 in engagement with the edge of the casing surrounding the opening through which the member 51 extends, the abutment 6| which will be moved to a position adapted to contact the trip member 33 just after actuation thereof by the member 41 and prior to actuation of the trip member 40 to eifect a transfer action. Such engagement will prevent further downward action of the member 46, by reason of further downward movement of the member 4'! being prevented by its engagement with the trip member 33.

As in my aforementioned accompanying application, manually operable handles 62 and 63 are provided for interrupting the automatic operation of the mixing machine. The handle 62 is associated with the discharge control valve l8 and the handle 63 is associated with the transfer control valve l6. As is best shown in Figure 3, the manually operable handles are connected to their respective control valves by toggle links 64 and 65 which are pivotally connected together by pins 66, the pins 66 riding in slots 6'! formed in the control handles and as shown in connection with the discharge control handle 62. The control handles are also provided with notches 68 for engagement with a locking member 69.

Accordingly, it will be apparent that by pull ing the handles outwardly and placing the notch 68 in engagement with the locking member 69, operation of the control valves by the batchmeter will be prevented. For example, if the control handle 62 is pulled outwardly and its notch 68 placed in engagement with the locking member 69, the ends Ill of the slot 61 will engage with the pin 66 to prevent downward movement of the pin ll connecting the link 65 to the operating member 12 for the discharge control valve l3 and thereby preventing upward movement of the discharge operating member 22 under the influence of the batchmeter.

Although the operation of the handles 62 and 63 in preventing automatic operation of the control valves I6 and I8 is the same as in my aforementioned application, these handles cooperate with the manual interrupting handle 51 in a new manner to be described. Upon operation of the manual control 51 to position the abutment 6| so as to interrupt the automatic control operation of the batchmeter 2|, the batchmeter will operate the trip lever 33 through the operating member 4! to effect a discharge operation of the discharge chute As soon as this action takes place, the trip lever 33 will contact the abutment 6| and further downward movement of the operating device 46 in the batchmeter 2| will be prevented. The operator of the mixing machine may then return the discharge chute II to mixing position prior to a complete discharge of the contents of the mixing chamber 3 by pulling outwardly on the handle 62 to operate the control valve l8 for returning the chute H to its mixing position. In this way, it is possible for the operator to split batches and only discharge the amount of completely mixed concrete which is needed from the final mixing chamber 3. To restore the automatic operation under the control of the batchmeter after such interrupted operation, it is merely necessary to move ing position.

the handle 5'! to lower the abutment 6| so as to permit continued downward movement of the operating member 46 to effect a transfer action of the transfer chute l0 through the operating member 48.

The operation of the apparatus is as follows: Assuming that batches of concrete are being mixed in both of the mixing chambers 2 and 3, the batchmeter 2| will first operate to trip the locking lever 33 to effect an action of the discharge control valve |8 to move the discharge chute II to discharging position to discharge the completely mixed batch of concrete from the mixing chamber 3. Thereafter, after further downward movement of the weight 26 the batchmeter through member 48 will trip the lever 40 to effect an action of the transfer valve IE to turn the transfer chute ID to transferring position for transferring the batch of concrete in the mixing chamber 2 to the mixing chamber 3 through the opening 5. When the valve I6 is thus operated to move the transfer chute to transferring position, fluid pressure will be admitted to the air cylinder |9 to return the valve l8 and the discharge chute II to non-discharg- As this action takes place, the pivotally movable operating member 41 will contact the abutment 49 and release the trip lever 33 for movement under the influence of its spring 50 to locking position for locking the discharging control member 3| to prevent movement of the discharge chute II from non-discharging posi tion. After such locking action of the trip lever 33, it will be noted that it is impossible to effect an operation of the discharge chute except after a predetermined timing control of the batchmeter 2|.

In the normal operation of the apparatus, the pin 55 will contact the switch 54' shortly after the transfer chute I0 is moved to transferring position to cause the light 53 to go into operation and to advise the operator to start the skip I upwardly with a new batch of unmixed aggregates for the chamber 2. As the skip 1 goes up to charge the mixing chamber 2 with a new batch of materials, it will operate the rod 24 to reset the batchmeter through the resetting member 25. As the resetting member 25 is moved counterclockwise, the link 42 will impart a downward movement to the transfer control member 35 to return the valve l6 and transfer chute ID to non-transferring position. In the event that the discharge chute is in discharging position, the link 44 will operate the member 3| to return the discharge valve l8 and the discharge chute II to non-discharging position. Thereafter, the batchmeter will continue its cycle as before stated with the initial operation being the tripping of the lever 33 to effect a discharge action of the discharge chute.

It will be recalled that upon movement of the transfer chute I0 to transferring position, the discharge chute II is returned to non-discharging position and locked in such position. If the skip I is not raised with a new batch of unmixed concrete aggregates for the first mixing chamber 2, then the operating member 5| will effect a second action of the trip member 33 to release the discharge control valve l8 for actuation.

This action will take place in those cases where it is desired to shut down the operation of the mixing machine at the end of the day for where the skip I has not been loaded with a batch of unmixed aggregates and it is desired to discharge the concrete from the chamber 3 without raising the skip 1. It will be noted that upon release of the trip lever 33 by the operating member 5|, the discharge control valve [8' will not be operated since the transfer chute II! will be in transferring position and the control valve I8 will be held in non-discharging position by the motor I9. Accordingly, to effect a discharge of the mixing chamber 3 after release of the trip lever 33' by the member 5!, it will be necessary to first operate the handle 63 to return the transfer chute l to'non-transferring position thereby releasing the fluid pressure from the motor [9 and thus permitting operation of the discharge valve I 8. The handle 62 may then be operated to effeet a movement of the discharge control valve [8 to discharging position for effecting a movement of the discharge chute H to its discharging position.

From the foregoing, it will be apparent that there is provided a batchmeter construction which will be effective to automatically control the time of mixing in the chambers 2 and 3 and for effecting the discharge of completely mixed concrete from the chamber 3 and for effecting the transfer of partially mixed concrete from the chamber 2 into the chamber 3. Moreover, there is provided means for interrupting the automatic operation of the batchmeter to take care of certain operating conditions without interfering with the timing control action of the batchmeter in preventing the transfer or discharge action from taking place prior to the completion of the mixing in either the chamber 2 or 3.

It will also be apparent that the provision of the pivoted operating member and cooperating abutment 49 provides for an automatic locking of the discharge means in' non-discharging position after operation of the transfer means to'transfer material from the compartment 2 to the compartment 3. It is thereafter impossible to effect a discharge of the compartment 3 Without a timing control action of the batchmeter 2|. This timing control is provided by the operating member 5| which will effect a second automatic release action of the trip lever 33 in those cases Where the skip I is not operated to reset the batchmeter 2| after operation of the transfer means.

Accordingly, it will be apparent that the batch meter 2| will be eifective to cause a discharge action of the chamber 3. The batchmeter 2! will also thereafter time the mixing period in the chamber 2 and then effect the transfer of the partially mixed aggregates to the chamber 3 for a further control period. At the end of such period, it will operate to release the discharge means to permit the discharge from the compartment 3. In this manner, the batchmeter 2| is operative on a single setting thereof to time and control movements of a batch of aggregates from the time it is charged through the opening 6 into the compartment 2 until it is completely mixed and ready for discharge from the chamber 3 impugn the opening [2.

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

i r i In combination, a mixer having a plurality o fi mixin g chambers, discharge means for said mixer movable to discharging and non-discharging positions, transfer means intermediate said mixingchambers and movable to transferring and non-transferring positions, and a batchmeter unit controlling the time of mixing in said chambers including instrumentali'ties for operating said transfer and discharge means to effect a return and lock of said discharge means in nondischarging position up'on movement of said transfer means to transferring position.

2. In a mixing machine of the class described, a mixer comprising a plurality of mixing chambers, one arranged to receive aggregates from the other, a transfer means for transferring aggregates frc-m one of the mixing chambers to the other and movable to transferring and nontransfe'rring positions, a discharge means for discharging the aggregates transferred to said other mixing chamber and movable to discharging and non-discharging positions, and a batchmeter unit controlling the time of mixing in said chambers including instrumentalities for operating said transfer and discharge means to effect a return and locking action of said discharge means in non-discharging position upon movement of said transfer means to transferring position, said batchmeter being operable to prevent operation of said discharge means to' discharging position after its return to non-discharging position until it has operated to control the time of mixing in said" other mixing chamber.

3. In a mixing machine of the class described, a mixer comprising a plurality of mixing chambers, one arranged to receive aggregates from the other, a transfer means for transferring aggregates from one of the mixing chambers to the other and movable to transferring and nontransferring positions; a discharge means for discharging the aggregates transferred to said other mixing chamber and movable to discharging and non-discharging positions, separate operating instrumentalities for said transfer and discharge means, a batchmeter having a' first control device for actuating one of said' operating instrurnentalities to effect a movement of said discharge means to discharging position, a second control device for subsequently actuating the other of said control instrumentalities to effect a movement of said transfer means to transferring position, and including mechanism for returning and locking said discharge means and the operating instrumentality therefor in nondischarging position upon operation of said transfer means by said second control device for a subsequent operation by said first control device.

4. In a mixing machine of the class described, a mixing comprising a plurality of mixing chamhers, one arranged to receive aggregates from the other, a transfer means for transferring aggregates from one of the mixer chambers to the other and movable to transferring and nontransferring positions, a discharge means for discharging the aggregates transferred to said other mixing chamber and movable to discharging and non-discharging positions, separate operating instrumentalities for said transfer and discharge means, a batchmeter having a first control device for actuating one of said operating instrumentalities to effect a movement of said discharge means to discharging position, a second control device for subsequently actuating the other of said control instrumentalities to effect a movement of said transfer means to transferring position, including mechanism for returning and locking said discharge means and the operating instrumentality therefor in non-discharging position upon operation of said transfer means by said second control device, and a third control device for effecting a second timed automatic operation of said first operating instrumentality for said discharge means.

5. In a mixing machine of the class described, a mixer having a plurality of mixing chambers, one arranged to receive aggregates from the other, charging means to introduce aggregates into one of said chambers, transfer means to carry said aggregates from said one chamber to a second chamber and movable to transferring and non-transferring positions, discharge means for the second chamber movable to discharging and non-discharging positions, and a batchmeter unit controlling the time of mixing of aggregates in said chambers and normally operative to effect an action of the discharge means to dis charge aggregates from said second chamber and thereafter an action of the transfer means to transfer the aggregates from said one to said second chamber for a timed mixing therein, and means operative directl from the charging means upon operation thereof to reset said batchmeter after said transfer action, said batchmeter including instrumentalities for effecting a second timed control of the discharge means Without operation of the charging means to reset the batchmeter to effect a second timing control period of the aggregates transferred to said second chamber.

6. In a mixing machine of the class described, a mixer having a plurality of mixing chambers, one arranged to receive aggregates from the 'other, charging means to introduce aggregates into one of said chambers, transfer means to carry said aggregates from said one chamber to a second chamber and movable to transferring and non-transferring positions, discharge means for the second chamber movable to discharging and non-discharging positions, separate operating instrumentalities for said transfer and discharge means, a batchmeter having separate control devices for each of said operating instrumentalities, means operative from the charging means upon operation thereof to charge said first chamber with a batch of unmixed aggregates for setting the batchmeter into operation, said batchmeter being operative after a predetermined time to actuate one of said control devices and its associated control instrumentality to effect an operation of said transfer means to transfer said batch of aggregates to said second chamber for an additional mixing period, said batchmeter being further operative to control the time of mixing in said second chamber and at the end of such time to actuate the other of said control devices and its associated operating instrumentality to permit the discharge of said batch of aggregates from said second chamber Without a second operation of the charging means.

'7. In a mixing machine of the class described, a mixer having a plurality of mixing chambers, one arranged to receive aggregates from the other, charging means to introduce aggregates into one of said chambers, transfer means to carry said aggregates from said one chamber to a second chamber and movable to transferring and non-transferring positions, discharge means for the second chamber movable to discharging and non-discharging positions, and a batchmeter unit operative from the charging means upon operation thereof to charge a batch of unmixed aggregates into the first of said chambers for controlling the time of mixing in said chambers and to cause timed sequential operation of the transfer and discharge means to transfer the batch of aggregates after partial mixing from said first to said second chamber and after further mixing in said second chamber to control 5 an operation of said discharge means to permit the discharge of said batch of aggregates from said mixer.

8. In a mixing machine of the class described, a mixer having a plurality of mixing chambers, one arranged to receive aggregates from the other, charging means to introduce aggregates into one of said chambers, transfer means to carry said aggregates from said one chamber to a second chamber and movable to transferring and non-transferring positions, discharge means for the second chamber movable to discharging and non discharging positions, separate operating instrumentalities for said transfer and discharge means, a batchmeter controlling the sequential operation of said operating instrumentalities and thereby the time of mixing in said chambers, resetting means operative directly from the charging means, said batchmeter having a resetting lever operable by said resetting means, and connections between each of said operating instrumentalities and said resetting lever for resetting said operating instrumentalities for subsequent control operation by said batchmeter upon operation of said resetting lever. B 9. In a mixing machine of the class described, a mixer having a plurality of mixing chambers, one arranged to receive aggregates from the other, charging means to introduce aggregates into one of said chambers, transfer means to carry said aggregates from said one chamber to a second chamber and movable to transferring and nontransferring positions, discharge means for the second chamber movable to discharging and nondischarging positions, separate operating instrumentalities for said transfer and discharge means, a batchmeter controlling the sequential operation of said operating instrumentalities and operative to effect actuation of one of said operating instrumentalities to effect a transfer ac- 45 tion after operation of the other of said instrumentalities to effect a discharge action, resetting means operative directly from the charging means, said batchmeter having a resetting lever operable by said resetting means, and a connection between said one operating instrumentality for said transfer means and said resetting lever for resetting said one operating instrumentality and thereby effecting a return of said transfer means upon operation of said charging means.

10. In a mixing machine of the class described, a mixer having a plurality of mixing chambers, one arranged to receive aggregates from the other, charging means to introduce aggregates into one of said chambers, transfer means to carry said aggregates from said one chamber to a second chamber and movable to transferring and non-transferring positions, discharge means for the second chamber movable to discharging and non-discharging positions, a batchmeter operable from said charging means for controlling sequentially first the operation of said discharge means and second the operation of said transfer means, and a signal means operable by said batchmeter after operation of said transfer means to effect a transfer action to advise the operator to start operation of the charging means, said signal including adjustable means for permitting its operation by said batchmeter at a variable interval of time after operation of said transfer 5 means so as to adjustably control the interval of time between operation of said transfer means and operation of said charging means.

11. In a mixing machine of the class described, a mixer having a plurality of mixing chambers, one arranged to receive aggregates from the other, charging means to introduce aggregates into one of said chambers, transfer means to carry said aggregates from said one chamber to a second chamber and movable to transferring and non-transferring positions, discharge means for the second chamber movable to discharging and non-discharging positions, a batchmeter operable from said charging means and including mechanism for automatically controlling sequentially first the operation of said discharge means and second the operation of said transfer means, and a manually operable device engageable with the batchmeter mechanism for interrupting the automatic action thereof after operation of said discharge means to effect a discharge action, and manual means for returning said discharge means to non-discharging position to permit partial discharge of the contents of the second chamber at different times, said manually operable device being disengageable from said batchmeter mechanism to reestablish automatic control thereby for thereafter effecting a timed automatic control action of said transfer means.

12. In a mixing machine of the class described, a mixer comprising a plurality of mixing chambers, one arranged to receive aggregates from the other, a transfer means for transferring aggregates from one of the mixing chambers to the other and movable to transferring and non-transferring positions, a discharge means for discharging the aggregates transferred to said other mixing chamber and movable to discharging and non-discharging positions, a batchmeter having a locking trip lever for controlling the action of said discharge means and a second trip lever for controlling the action of said transfer means, an operating device for actuating said first trip lever to effect a discharge action of said discharge means, a second operating device for actuating said second trip lever to effect a transfer action of said transfer means, means operable upon actuation of said second trip lever for returning said discharge means and said first locking trip lever to non-discharging position, and a third operating device for effecting a timed automatic second operation of said first trip lever to effect a second discharge action of said discharge means.

13. Apparatus as claimed in claim 12, wherein said first locking trip lever has a bias to locking position and said first operating device is movable out of engagement therewith, together with means for effecting movement of said first operating device out of engagement with said first trip lever substantially upon operation of said second trip lever to permit the return of said first trip lever to locking position under its bias for a second timed automatic action by said third operating device.

14. In a mixing machine, plural mixing chambers, charging means for a first chamber, discharge means for the second chamber, transfer means to transfer aggregates from the first to the second chambers, automatic control mechanism including controlling devices for the said transfer and discharge means, operation initiating devices between said automatic control mechanism and the charging means for setting into operation the automatic control mechanism upon operation of the charging means to operate in timed relation, first the discharge control device, next the transfer control device, and then again the discharge control device.

15. In a mixing machine, plural mixing chambers, charging means for a first chamber, discharge means for the second chamber, transfer means to transfer aggregates from the first to the second chambers, automatic control mechanism including controlling devices for the said transfer and discharge means, operation initiating devices between said automatic control mechanism and the charging means for setting into operation the automatic control mechanism upon operation of the charging means to operate in timed relation, first the discharge control device, next the transfer control device, and then again the discharge control device, said automatic control mechanism including connections to the charging means which when the charging means is actuated to charge the first chamber prior to the second actuation of the discharge control device will prevent such second action by the automatic control mechanism.

16. In a mixing machine, plural mixing chambers, charging means for a first chamber, discharge means for the second chamber, transfer means to transfer aggregates from the first to the second chambers, automatic control mechanism including controlling devices for the said transfer and discharge means, and connections between the charging means and the automatic control mechanism to initiate the operation of the latter, the automatic control mechanism com,- prising instrumentalities to operate the discharge control device twice and the transfer control device once in a single action of the automatic mechanism.

17. In a mixing machine, plural mixing chambers, charging means for a first chamber, discharge means for the second chamber, transfer means to transfer aggregates from the first to the second chambers, actuating devices for the transfer and discharge means, and automatic operating devices controlled from the charging action of the charging means to in turn operate the discharge actuating device, then the transfer actuating device, and then the discharge actuating device a second time, including interference mechanism operable when the charging means is actuated to charge a second time prior to operation of the discharge operating device a second time for preventing the actuation of said discharge actuating device a second time as aforesaid.

OSCAR SHECK.

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