US843278A - Concrete-mixer. - Google Patents

Description

E. E. JAGKgQN-p CONCRETE DJIIXEE. APPLIUATION FILED MJL 3 SHEETS-SHEET 2.

IN VEN TOR.

BY /Lm ATTORNEX PATTI?,

E. JACKSON..

CONCRETE MXER.

APPLICATION. FILED MAY 31,1

S SHEETS-SHEET 3.

ELMER E. JACKSON,

OF FREMONT, OIIIO.

CONCRETE-MIXER.

Specification of Letters Patent.

Patented Feb. 5,1907.

Application led May 31, 1905. Serial No. 268,523.

To all whom it may concern:

Beit known that I, ELMER E. JACKSON, a citizen of the United States, and a resident of Fremont, county of Sandusky, and State of Ohio, have invented certain new and useful Improvements in Concrete-Mixers7 a full and complete description of which is hereinafter set forth.

The purpose and object of this improvement is to rovide a mixer ofthe rotary type and of suc peculiar construction that when it is properly loaded with any desired proportion of sand and cement and the same is then made to operate the two ingredients will become perfectly mixed, and then when Water is added in suitable proportion and the same is continued to operate the dry mixture becomes a perfect mortar, and then upon the addition of any desired proportion of suitable gravel or stone and gravel and the machine continued to` operate the entire mass becomes a perfectly-mixed concrete or beton.

It is the further purpose of this improvement to provide such a machine that the same may be made to receive the several ingredients of concrete or beton While the machine is in operation and then after a given batch is sufliciently mixed to discharge the.

same either in part or .in Whole without either being compelled to tilt the mixer or sto the operation of the machine.

he manner in which I do this will be presently described. Y

Referring to the drawings herein, and which are made a part hereof, Figure 1 represents a side elevation of my machine as seen from the receiving end. Fig. 2 re rsents said machine `as seen in top plan. ig: 3 represents a section of my lmprovement along the line A A of Figs. 1 and 2 and is made at such a time in the revolution of the drum as shows a radial line to pass transversely through the blade 3 at the point of deflection. Fie'. 4 represents a vertical section along the line B B of Figs. 2 and 3 looking in the direction of the arrows shown by those figures. Figs. 5-and 6 represent details of the blades or webs whichbelong inside the drum. Fig. 7 represents a crosssection of the drum and blades on the line C O of Figs. 2 and 3 looking in the direction of the arrow seen in those figures. Fig. 8 represents a pair of blades in detail.

` Coming now to a more specific description of my invention it is sufficient to say thatsaid machine is mounted upon a suitable truck or other frame 1, and the same essentially consists of a cylindrical drum 2, having Within it a seriesof blades or Webs in pairs which extend from end to end thereof and are suitabl secured thereto. One of said blades 3, W 'ch is represented in detail by Fig. 5, is so formed that when in place its outer edge conforms to the inner surface of the drum. Oppositely said blade is formed With a recess, across one end of which the companion blade 4 is placed. Said blade 4, which is vrepresented in detail. by Fig. G, is a flat strip of suitable material having parallel edg'es and of Width equal to the depth of the recess of its companion blade 3. Said blades have their ends suitably flanged and adapted to be secured to said drum, as by rivets 4, Fig. 7. Said drum is preferably -mounted upon bearing-rollers 5. Said rollers are preferably in form of wheels having a flange 6. Said rollers are represented in Fig. 1 with journals 7. Said drum is made to rotate by rack engagement with a chain 8, which is driven by a motive power 9 and preferably arranged with some form of friction-clutch 10 as any mechanic may suggest, so as to disconnect the movement of the power from the machine proper. Said rack 11 with teeth 11, is shown best in Fig. 4. Said. blades are so set within the drurnvthat the contents is moved alternately from end to end of the drum and is repeatedly thrown upon itself, so as to thoroughly mix the contents. To accomplish this, I'set each pair of blades so as to cross each other, (sec Fig.3,) thus giving to their planes an angle both with reference to each other and with reference to a plane which is in line with the axis `of the drum. Referring to Figs. 3, 4, and 5, it will be seen how said blades are so located that one of them, 3, becomes an outer blade and the other, 4, an inner blade. The former, as seen, is given a suitable curvature c e c', so las to follow the inner surface of the drum. Said blade being made to conform to the inner surface of the drum and being given a suitable angle it forms toward the discharge end of the drum, or at the right of the point of intersection, Fig. 3, a sort of bucket or receptacle 11x for the material as it is being carried from the lowest to the highest position. (See Figs. 3 and 7.) The latter or inner Vblade is of practically uniform width from end to end, and having its width only IOS equal to the depth of the recess formed in its companion blade and being given a suitable incline for the purpose the material is caused to be divided, (see Fig. 7 so that as said material or contents is being lifted the upper portion or half thereof is made to move along the incline of said blade 4, while in'the position seen in Fig. 3 the lower or outer half of said contents being at the same time retained within the bucket is lifted, and finally dumped or made to fall over the point a of the blade 3 as the drum continues to rotate.

Manifestly the angle made by the intersecting planes of the two blades may be varied and should be varied with the length of the drum, so as to give sufficient incline to move the material from end to end of the drum as it is made to rotate.

In practice I am now successfully using a machine of this construction which has a drum forty inches in length and with a radius of two feet. It will be noticed that the blade 3 is deected at the point a for a purpose hereinafter explained. This point in my machine is eight inches from the drumhead. This Vblade is then so set that its outer edge at the oint c is seven and enehalf inches from t e axial plane upon one side, while the point c is correspondingly distant from said plane upon the oppositeside thereof. In order to better understand the setting of said blade with reference to the relation of its own plane to radial lines, reference may be had to Fig. 7, which is a diametrical section, cutting the blade 3 along the line a c and showing said section to be upon a radial line from the axis of said drum. Since the blade 4 performs the function of carrying material toward the receiving end of the drum as said blade approaches and passes a horizontal plane through the axis of said drum, manifestly its plane should be such as to aid in performing that function. Upon said diametral section the plane of said cross-section of said blade 4 might be upon a radial line,as in case of the blade 3, companion thereto; but preferably I make said blade to have a plane through its crosssection, which is parallel to that of `the crosssection of said blade 3. In practice I set the blade 4 upon the said diametral section, so that there is a distance of fifteen inches between it and its companion blade, and I give it correspondingly the same incline from end to end of drumfas already stated, with reference to said blade 8, but reversely. It should be understood that said rule is not stated as one from which no variation may be made; but, on the contrary, it is stated as one which in the present instance gives satisfactory results. Manifestly where a drum of greater diameter is used and with a different-size opening, the lane of said blade may be varied within the l1r`nits of effectiveness.

For the purpose of stiening the blades and connecting them together at the point of crossing, a suitable rivet 12b may be passed through the holes 12 12a therein.

It may be seen, Fig. 5, that the blade 3 is properly curved or rounded at its outer edge between the points c c', so as to follow the line of the inner surface of the drum. The length of the line e d is mathematically determined by well-known trigonometric rules. Said blade 3 is deflected at thel point a, and from a to b the plane of said blade is practically parallel with the corresponding part of the blade 4, and thus serves to cause said contents to fall wholly within the drum rather than close to the opening 2a at the end ofthe drum, where a portion of said contents might be lost. A discharging-chute 13 is provided with ears 13, which are axially pivoted to standards 14, secured to the framework. Said Vchute when tilted into position is made to receive at its inner end the contents of said drum as it falls over said lip a. Said chute is Inadeto tilt by means of a cranked shaft 15, which is provided with a crank 15*L and is made to wind a chain 16, which is secured thereto by a stud or pin 16a. At each end said chain is secured to the under side of said chute b staples 16b or other suitable means, and t us as said crank is turned in one direction said chute is tilted and made to receive and discharge the contents of said drum, while if it be turned in the opposite direction said chute will be outside cf the lines of drop from said point orlip a). The inner end of said chute is suitably formed or shaped so as not to interferewith the continued operation of said drum when' discharging concrete. At both ends of said drum and concentric with the circumference thereof it is made to carry a cone or funnel 'shaped shield 17, which projects out and what I claim as new is- 1. In a rotary concrete-mixer, a rotary drum provided with a series of pairs of blades, each pair comprising an inner and outer blade, which are so set with reference to an axial plane of said drum, that the two blades cross each other at a point about midway of the length of said drum. and at sufficient angle so that as said drum is rotated, the contents thereof will be moved along the blades alternately from one end of said drum toward the other, according to the direction of the-incline; and said outer blade bein widened from one ,end thereof to said point o IOO IIO

IIS

crossing, and deflected at a tween, near the discharge en of said drum, both for discharging purposes, said blades being so set, and the outer blade bein so deflected that a cross-section of. sai outerblade through said point and along the line inner blade upon the plane of said radial line- Will be substantially parallel thereto, in com# bination with means for the operation of said drum.

2. In a rotary concrete-mixer a rotary drum in combination with a series of pairs of outer and inner blades, 3 and 4, said blades extendin from end to end of said drum, and so lace that they have a reverse incline Wit reference to an axial plane thereof, said inclines being such that as said drum is rotated, the contents thereof is moved alternately in' opposite directions7 said outer blade being widened and deflected near the discharge end of said drum, both for dischargin purposes, and being so set and being so eflected that a cross-section thereof through Said point and along the line of deflection, will follow a radial line from the axis of said drum, and said inner blade being so set thatas said contents is raised by said outer blade a portion'thereof falls thereon and is carried in the reverse direction.

3. In a rotary concrete-mixer, a hollow cylindrical drum with drumheads (partially c osed, and a series of pairs of bla es fixed therein which extend from end to end thereof, .one of which is denominatedl an outer oint therebeblade, and the other an inner blade, said blades being such and so placed that as said drum is made to operate, and the blades of any given pair are successively brought into operative position, the contents of said drum will be moved alternately in opposite directions, said outer blade beim' widened for part of its length from the disdliarging end of said drum, and deflected at a point near said end, both for dischargin purposes, in conibination with means for t e operation of said drum. y

4. In a drum of a rotary concrete-mixer, one of a pair of blades denominated the outer blade, said blade being widened for a portion of itsflength from one end thereof, and defiected at a point within said widened portion near said end both for discharging puroses, in combination with a companion lade denominated an inner blade which crosses the same and is secured thereto, both said blades adapted to be secured to said drum, and to have their respective inclines with reference to the axial plane of such. drum such, that as the drum is rotated, a part of any contents thereof will be moved toward one end of said drum, while another part thereof will be moved in the opposite direction-and further so adapted that when set within such drum, a radial line from thc axis thereof will pass over said point of deflection and transversely throu h said blade.

ELMER E. ACKSON.

Witnesses:

F. E SEAGER, i FRANK J. TUTTLE.

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