US1447125A

US1447125A - Concrete mixer

Info

Publication number: US1447125A
Application number: US358815A
Authority: US
Inventors: William E Dunn; Harry E Dunn
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-02-16
Filing date: 1920-02-16
Publication date: 1923-02-27
Anticipated expiration: 1940-02-27

Description

W. E. DUNN ET AL 001403211: MIXER Filed Feb. 16 '1920 5 sheets-sheet; 1

T Tv5 Feb. 27, 1923.

W. E. DUNN ET AL CONCRETE MIXER OWN, T N ND U D ...l| V N E 4 mm. x, m 8 WH 7 w 5 z 6 6 5 M? w J M ii I 1 a w m v w w i u 1 6 M llclll 17 l lll l m a x a a m l Feb. 27, 1923. 1,447,125

w. E. DUNN ET AL.

CONCRETE MIXERl Filed Feb. '16, 1920 5 sh eets-sheet I5 INVENTORS WILLIAM EDUNN HARRY E.DUNN

Feb. 27, 1923. 1,447,125

W. E. DUNN ET AL CONCRETE MIXER I Filed Feb. 16, 1920 5 sheets-sheet 4 76 INVENTORS WILLIAM EDUNN mo HARRY E.DUNN

ATTYS.

Feb. 27, 1923. 1,447,125-

W. E. DUNN ET AL CONCRETE MIXER Filed Feb .16, 1920 5 sheets-sheet 5 Fred INVENTORS WILLIAM E. DUNN HARRY E.Dum-|,

Patented Feb. 27, 1923.

UNITED s T ier 1,447,125 tries.

WILLIAM E. DUNN AND HAIR-RY E. DUNN, OF HOLLAND, MICHIGAN CONCRETE Applicationfiled February 16,1320. Serial l\'l'o.,3 5 3, 8 1.5, i

To all whom it mayconcem Be it known that we,- Wmnren and HARRY E. DUNN, respectively c tizens of the United States and the Dominion of Canada, and residing at Holland, in the county of Ottawa, in the State'ol Michigan, have invented. certain new and useful I mprovements in a Concrete Mixer, of which the following is a specification,

Our invention-relates to improvements .111 apparatus for mixing cement and aggregates for the production of concrete prior to ts being used for the divers purposes in Which concrete is usually employed.

One ofthe objects otour present invention is the provision of a concrete mixer thatihas the mixing compartment constructed withits bottom in a substantially horizontal plane and rotatable about a central axis, With shovels or blades positioned ithin said mixing compartment upon lined brackets but disposed at divers angles of inclination to the axis of the mixing compartment and at divers angles to the walls of: the mixing compartment. Another object or" our invention is the provision in a concrete mixing apparatus of suitable novel instrumentalities for controlling the discharge of the aggregates or mined elements tt'rom the mixing compartment :and With the cooperation of the mixingshovels or blades to substantially clean :out the mixing compartment of its mixture Whenever desired. Another object is the provision of-suitab'le'means for elevating and feeding the ingredients or elements to the mixing compartment which structure is adapted to be operated automatically to dump and, discharge at the proper times. ln'connect-ion withtheimixing structure and :the elevating and feeding apparatus .We have devised SLlllifllJlQ driving mechanism WlIlCll is under athe control of the operator and -is adapted to actuate either the oneor the'other of said mechanisms separately. or :both of them simultaneously. We have also designeda suitable clutch mechanism in connectionrwith our apparatus tor-causing-ithe divers parts to beput-into operation.

Qther objects which will be obvious to others skilled inthis art comprise the provision of a concrete *miner and'its associated operated by comparatively unskilled WOIkmen, which :is economical to .operateandiniexpensiae t manufacture. and, "Vi hi h i effecti e per orm n he v ns eectieas ing had to the accompanying drawings which form-apart of this specification, in which, i

I Figure is. a vertical .elevationof .our, improved concrete mixer looking vat it fromone of the sides to discloseaportion of the vele.

vating and feeding mechanism.

Figure 2 is a vertical elevation thereof looking at the, structure at substantially right angles .to Figure 1, the adjacent half of the Wall of the mixing chamber being re moved" for clearness as Well as some of the structure infront ofv said chamber.

Figure .3 is .a perspective view of'theinterior of the mixing chamber shovving the relative disposition ofthe mixing and dis,- charging shovels. g

Figure 4: is a detail fragmentary View of the elevating and feeding buciket and. the means for locking the same.

Figure 5 is anenlargeddetailvietv of one face of the clutch disk.

Figure 6 is T a similar view of the opposite face thereof.,and

Figure 7 is a detail view inpartialseotion showing the manner otoperat-ing the clutch.

Figure 8'is a bottom .plan ofthe mixing compartment.

Figure 9 is atop plan of the intermediate rectangular supporting platfiorm detached,

topof a -suitablewconcrete molding machine or other apparatus or locality .rjvheize i-itrgis convenient "to :have (the concreteldelivered. Itvvillv be understood however that-our apparatus is .also --W8ll adapted :for .use onl-ja ground or floor :level, and theillustration herein merely typifies one of-themany uses of our-apparatus Standards =1'0. preferably .fourin number,

provide ,\;a support i'or a platfo m "11 iihrit .isin a'hcrizontal plane veelllaheae theme trally provided with a connectingmember of: a circular or annular shape and has a ball-race or groove 16 in its upper face in which anti-triction balls 1? are placed. luternally of the connecting member 15 is an angle-sha 'ied ring 18 arranged concentrically therewith and connected thereto by webs 19 so that the ring 13 is spaced therefrom.

a slight distance. A cylindrical conduit 20 is movably secured to the flange of ring;- l8 and leads downwardly either straight or at an angle as shown in the drawing. This conduit 20 is rotatable and provides the means for conveying the ct icretc and a ggregates to the proper or desired place.

The mixing compartment preferably coinprises a bottom 21 of circular ape, having a downturned peripheral flange to which the vertical cylindrical wall 1..., is secured. The bottom 21. preferably. i inverted conical shape or inclined towards the center which is provided with a central. discharge opening 24. Concentric with. opening 24 is a ballrace or grooved flange that alines with and arranged in apposition with the ballrace or groove 16 in the connecting; frame, whereby he mixing? compartn'ient is supported upon the and friction rollers or balls. as will be under stood. Outside the ball-race 25 is an annular toothed rack 26 that is engaged by a bevel pinion 27 carried upon the adjacent end of a short drive shaft 253. lhis drive shaft 28 is journaled in suitable bearings 29 in the adjacent i l-shaped frame and etc tends outside said bearingswhere an ac tuatingpulley 30 is secured to it. which pulley derives its motion from a belt or other suitable source of power.

The central opening 24: in the bottom oi" the mixing compa .nent is kept normally covered by a conical shaped cap 31 carried upon the lower end of a vertically reciprocatory rod 32 that is journaled intermediate its ends and adapted to slide in a bearing 33 mounted upon and between the horizontal cross-rails 13. The means for moving; the cap to uncover the opening;- comprises a lever 34; tulcrumed adjacentone end upon a short bracket 35 secured to and arising: from one of the cross-rails 13. The longer end of lever 34 is raised and lowered. by a nea /n25 rock-shaft 36 the outer end'whereof has a lateral arm 37 that is actuated or reciprocated by an operating rod or handle The movable end of the shorter arm of lever 34: is bifurcated, the arms 39 whee" ol? extend upon opposite sides of rod 3.4-

anrl are pii'otally connected thereto. in order to prevent the cement and aggr rates f om being dumped onto this bearing 3-1 we have provided a small conical shaped. shield ll) that its down adjacent the bearing 33 when the cap 31 is in .a lowerei'l position to cover the opening: in the compartment. Carried upon the cross-sills 13. preferably over one of the I i-shaped end uprights is a water tank 41 connected in any suitable manner with a water supply and provided upon its interior with any suitable or well known t ue of: float valve for cutting oil the supply of wa when i the tank has been nlled to a predetermined point (not shown). 'lhis is tor the purpose of permitting; the workman or operator to simply pull a chain, rod,-or the lil when it is desired to supply the mixing: corioaitment with water and upon so doing: the tank 41. will discharge into the mi 5 coinparument the desired quantity of? WHLGI for the batch of cement and aggregates tl'iat have'been mixed, after which the tank will immediately ro-iill to its predetermined l ,rel. in order to agitate and thoroughly mix the cement and aggregates. both before and utter the discharge of water into the coinpartment, we have provided a plurali y of shovels or scoops which. in addition to per forming he before-nientioncd functions, as adapted when the cap 3'l. has uncovered the central opening in the compartment. to scoop scrape the central opening in the compartnient to scrape or scoop the mixture or batch toward the center and cause the same to be dischar ed through the opening 24. and at the ea '18 time effectively scrape oil the surface ot'the bottom. [is shown in the drawi these shovels are carried upo'nthe lower ends of brackets -12. l3, l4. and 4.5 that are peudently secured to the cross-rails in any suitable manner. We have that p i through the latter and through longiti inaliy elongated slots in the of the shovel blades at an angle to throw the material towards the center while one of the blades is disposed so as to direct the material from the center towards the wall of the mixer. .lhe exact disposition of these blades not important except that it will shown the brackets connected. to the cross-rails by bolts be borne in mind that they should accomplish the discharge of the material from the mixer as well as the thorough mixing thereof. As seen inthe drawings, wehave provided upon the bracket 43 a shovel 47 that is relatively low to permit, the aggregates to tumble over the same and this shovel, together with shovels48 and 49 carried upon

brackets

42 and 45, respectively, are so arranged, that the aggregates are tumbled ,or scooped toward the center, and the shovel 50 on bracket 44 is only. slightly inclined to the vertical and is disposedso as to move the mixture away fromthe center toward th wall of the compartment.

The means for feeding the aggregates and cement to the mixer, especially, when the mixing apparatus is mounted upon an elevated platform, comprises a lift or elevator structure, the bucket whereof is raised and lowered in ,a suitable frame or carrier through suitable instrumentalities that are driven by the drive-shaft. Uprights -51 of angle metalare secured to the platform 11 and extend a suitable, distance above the cross-rails 13 and inclined parallel guides 52 of channel beams extend from the ground or fio'or up to and are secured to the upper ends of the standards 51. The guides 52 have their channels facing each other, and the upper ends of the uprightsand guides are connected by a cross-piece'comprising a pair of channel irons 53 arranged with their backs facing, each other and spaced a slight distance apart to permit of the mountingof a pair of grooved pulleys 54 and 55. A suitable frame 56 of rectangular shape is provided for carrying the bucket 57, and has small blocks 58 upon the exterior of its vertical members. These blocks fit into the facing grooves or channels of the inclined members 52 so that the frame and the bucket may be guided in their up and down movements. The bucket 57 is provided with trunnions 59 in its lower portion that fit into bearings. 60 on the frame which places the -enter of gravity of the bucket and its contents in a plane to one side of the trunnions and toward the mixer. In order to lock the bucket in a substantially upright position, we have provided a suitable latch which is adapted to hold the bucket stationary in the frame during itselevationand to be released when the bucket and frame reach the proper level for dumping the ag gregates into the mixer. This latch consists of a bell-crank, one arm 61 whereof is provided with a hook-shaped end to engage a stud 62 on the bucket. The bell-crank is pivoted at the angle formed by its arms on a bracket 63 carried by the carrier frame and the other arm 64 preferably extendsdowm wardly and has a lateral member 65 project- 3 ing therefrom in the plane of a cam or boss 66 passes down under a pulley 68 journaledfin r the upper member of the elevator frame-and then passes up over pulleys 54 and 55 and thence down to a winding sheave or drum.

69 carried on the extended and of a shaft 70 journaled in bearings in. the. supporting frame for the mixer. The opposite'end of shaft 70' has a gear. 71 mounted loosely on it that is in mesh with a pinion 72 fixedly isecured to the main drive-shaft 28.

A-clutch mechanism is employed to lock the gear 71 to its shaft 70, which clutch mechanism is operated by a horizontallydisposed rod 73 that is reciprocated longitudinally by a hook-shaped lever or actuating arm 74 pivoted to the frame of the appara tus and one end whereof extends downwithin convenient reach of the operator.

Thisv clutch mechanism comprises a hollow drum or flange "7 5 made integral with 01" secured to the acent side of the gear '1';

71. Secured to the shaft 70 by any suitable means is a disk or circular plate 76 provided with a central hub to strengthen it at its point of attachment tothe shaft.

Set eccentrically in the inner face ofthe disk is a stub or' pintle 77 upon which are pivoted substantially semi-circular segments 78 of the-expanding band which are of 'L-sec tion and the cylindrical or flange portions opposite their pivoted ends are bent inwardly to form lugs 79 having opposingfaces. The segments are retained in a normally contracted position by means of, helical springs 80 passing between and secured to the adjacent ends of the respective segments. The

disk 76 is bored at a point substantially diametrically opposite to the location of the stub 77 for the receipt" of a shorter stub shaft 81 extending upon both sides ofthe disk and to the inner end of which is fixedly secured an elongated block or cam 82 the smallest diameter of which is such ,as'to snugly fit between the inwardly bent opposing faces of the lugs 7 9 when the segments 78 are in normal-or contracted posi-- 'tion. On the other endofcs'tub-s-haft 81 is fixedly secured a curved or crescentshapied i lever arm 82 the movable "end whereof is: bored andtapped to receive a bolt 83 dis-- posed substantially radially of the shaft 70 and the end of which bolt nearest the shaft. is provided with a headed end 84 and which maybe securedxin desired relation to the lever arm by a lockenut 85 Surrounding the shaft and movable longitudinally thereon is a collar 86 having an inclined or conical end portion 8'? which is adapted to be moved to engage the headed end 8% oi: the bolt thereby moving or rocking the lever arm 82 and rotating the stub-shaft 81 which in turn rotates the elongated block or cam 82 and expands the semi-circular segments 78 into engagement with the inner face of the flange off the drum thus causing the movement of the gear 7'1 to be transmitted to the shaft 70.

By operating the clutch mechanism just described suiiiciently hard the shaft may be rotated with suiiicient force to elevate the bucket with its contents, and by operating the clutch lightly so that some degree oi? slippage is permitted it may be employed to retain the bucket any desired elevated position or to act as a brake in permitting the descent of the bucket.

A clutch mechanism. substantialy similar in all respects with that just described, is provided. upon the end or" the main. drive-- shaft 2-8 to connect the power pulley 3O thereto and therefore need not again be described. The drum 88- in this instance is of course a. part of the pulley 30 while the. disk 89 and the collar 90 are carried upon and rotate with said drive-shaft 28. The lever 91 pivoted to the supporting frame. is employed for movin the collar to permit its beveled portion to engage the segmental shaped lever-arm operate the segments inside the drum. Also we have provided a suitable brake mechanism for retarding the reverse rotation oi shaft 70 and the lowerin g of the bucket which comprises a drum 92 pendently secured to rail l l of the connecting platform so that shaft 70 passes axially therethrough. A collar 93 is moved longitudinally on shaft 70 by a lateral member 9% carried on the adjacent portion of rod 73 so that said collar will cause the actuation of the brake element inside the drum. When rod 73 is moved to throw the gear clutch collar 93 moves away from the brake element permitting the rotation of shaft 70, and vice versa when the gear clutch is released collar 93 actuates the brake elements and slows down or stops the rotation of shaft 70, and thus controlling the move ment of the bucket.

What we claim as new is 1. A concrete mixer comprising a cylindrical casing having its axis in a vertical plane, a concaved bottom therefor having a discharge port in its lowest portion; said structure adapted to be rotated upon a vertical axis, and a plurality of stationary shovels positioned in said casing adjacent said bottom disposed at divers angles to the axis of rotation of said bottom whereby the material operated upon is moved transversely of the direction of rotation including upwardly from said bottom and towards the center o1" said bottom.

2. A concrete mixer comprising a cylindrical casing having its axis in a vertical plane, a bottom therefor having a discharge port in its lower portion; said structure adapted to be rotated upon a vertical axis, a plurality of stationary shovels positioned in said casing adjacent said bottom disposed at divers angles to the axis of rotation of said bottom whereby the material operated upon is moved transversely of the direction of rotation and towards said central discharge port, and a vertically movable coni cal shaped cap extending above said bottom and adapted to cover and uncover said discharge port and to co-operate in closed posi* tion with said shovels in turning said materials.

3. A concrete mixer comprising a cylindrical casing having its axis in a vertical plane, a bottom therefor having a discharge port in its lower portion; said structure adapted to be rotated upon a vertical axis, a plurality of stationary shovels positioned in said casing adjacent said bottom disposed at divers angles to the axis of rotation of said bottom whereby the material operated upon is moved transversely of the direction of rotation and towards said central discharge port, a conical shaped cap extending above said bottom and coacting with said discharge port, and means for moving said cap vertically to cover and uncover said port.

d. A concrete mixer comprising a cylindrical casing having its axis in a vertical plane, a conical bottom therefor having a discharge port in its lower portion; said structure adapt-ed to be rotated upon a vertical axis, a rotatable and vertically movable cap extending above said bottom for controlling said discharge port, a plurality of stationary shovels positioned in said casing ad'- jacent said bottom disposed at divers angles to the axis of rotation of said bottom whereby the material operated upon is moved. transversely oi? the direction of rotation, a supporting frame in which said structure is mounted having a horizontal member extending transversely above said casing on which said shovels are pendently mounted, and means for rotating said casing and bottom.

5. A concrete mixing structure comprising a rotatable cylindrical casing consisting of side and bottom walls the latter whereof is provided with a central discharge opening, a conical closure for said opening extending above said bottom, fixed shovels extended into said casing and positioned adjacent said bottom, said shovels inclined at divers and opposing angles'to the direction of rotation of said casing whereby the ma- 7 terial being mixed is moved generally towards said conical closure and is tumbled upwardly into the strata of material above the bottom stratum. v

6. In a concrete mixer comprising a suit able support, a cylindrical casing revolvably mounted thereon, a downwardly concaved bottom for said casing having a discharge port in its lower portion, a conical shaped closure for said port extending above said bottom, a vertical reciprocable spindle upon which said closure is mounted, a lever fulcrumed intermediate its ends upon said support, and means coacting with the ends of said lever and said spindle whereby the movement of said lever is transmitted to said spindle to open and closesaid closure.

7. In a concrete mixer comprising a suitable support, a cylindrical casing revolvably mounted thereon, a bottom for said casing having a discharge portin its lower portion, a conical shaped closure for said opening extending above said bottom, a vertical reciprocable spindle upon which said Closureis mounted, a rock-shaft journaled upon said support, a lever upon said rock shaft the outer end whereof engages a projecting portion of said spindle, and means for rocking said shaft. 8. A concrete mixer comprising a cylindrical casing having its axis in a vertical plane, a concaved bottom therefor having a discharge port in its lowest portion,

lateral means for rotating said structure about a vertical axis whereby said discharge port is unobstructed, a plurality of stationary shovels positioned in said casing adj acent said bottom disposed at divers angles to the axis of rotation of said bottom whereby the material operated upon is moved transversely of the direction of rotation inclining upwardly from said bottom and towards the center of saidbottom. v 9. A concrete mixer comprising a cylindrical casing having its axis in a vertical plane, a concaved bottom therefor having a discharge port in its lowest portion, bearings concentric with said discharge port and r0-- tatably supporting said structure, means exterlor to SaICl bearlngs for rotating said structure, whereby'said discharge port is unobstructed, a plurality] of stationary shovels positioned in said casing adjacent said bottom disposed at divers angles to the axis of rotation of said bottom whereby the material operated upon is moved trans-i versely of the direction of rotation inclining upwardly from said bottom and toward the'center thereof.

Signed at Holland, county of Ottawa, and State of Michigan, this 9th day of February, 1920,

. LLIAM E. DUNN, v

' l-IARRY E. DUNN. Witnesses:

WM. ARMDsHoso'r, BURT L. Foam.