US907284A

US907284A - Conors te-mixeb

Info

Publication number: US907284A
Authority: US
Publication date: 1908-12-22
Anticipated expiration: 1925-12-22

Description

E. B. RAVE NG ROPT. CONCRETE MIXER.

AIfPLIOATIOH FILED JUNE 5, 1908.

907,284, I Patented Dec. 22,1908.

2 SHEETS-SHEET 1.

1 WNW/53135: INVENTOR- I a I I Atlorneyo.

E. B. RAVENGROFT.

CONCRETE MIXER.

APPLICATION FILED JUNE 5, 190a.

Patented Dec.22,1908.

2 SHEETS-SHEET 2.

ml M Z l E W 0 I Arlorneyi UNITED" STATES, PATENT QFFICE.

EVAN B. RAVENCROFT, OF MISHAWAKA, INDIANA.

' OONCBE TE-MIXER.

To all whom it may concern:

vBe it known that I, EVAN B. RAVENCROFT, a citizen of the United States, and resident of Mishawaka, St. Jose h county, State of Indiana, have invente certain new and useful Improvements in Concrete-Mixers; and my preferred manner of carrying out the invention is set forth in the following full, clear, and exact description, terminating with claims particularly specifying the novelty.

This invention relates to mills, and 'more especially to mortar mixers; and the object of the same is to produce a mixer for concrete and the like capable of being readily filled and dumped, and of being taken apart as for repalr.

The following specification sets forth the details of the present invention, asshown in the drawings wherein- Figure 1 1s a perspective view of the mixer in the position it generally assumes when in use, showing in detail the stop pins whose use permits the turning of the frame through one alf a circle and whose removal permits its turning through a full circle. Fig. 2 is a central vertical section through the mixer shows ing it tilted on its trunnions to a position where the axis of the drum is oblique and the entire machine is balanced. Fig. 3 shows details of the parts of the drum slightly separated from each other, showing their preferred manner of formation. Fig. 4 is a lan view and Fig. 5 a front elevation of one o the F 1g. 6 1s a sectional view show.

deflectors. in g the tumblin r of the material which takes place when the body rotates on a horizontal axis and Fig. 7 is a diagrammatic view showing the spiral agitation of the material by the deflectors when the body rotates on an oblique axis. Fig. 8 is an elevation of the inlet end of the mixer, showing the hop er detached and with one of its bearings bro en away.

7 Referring tothe drawin s, the numeral 1 designates the base from w ich rises a air of supports or legs 2 in which are journa ed the trunnions 3 of a frame 4here shown as comprising two like members havin their centers parallel and their ends bent ob iquely inward, and the extremities of the latter are connected by ball races 5 which are attached to the extremities by screws and are preferably made interchangeable so that any one will fit in the place ofanother on any machine of the same size. To the outer end of Specification of Letters Patent.

Application filed June 5, 1908. Serial No. 437,037.

Patented iDec. 22, 1908.

one trunnion is secured a light handle 7 preferably standing in line with the frame 4, and adapted to rest in horizontal position on stop pins 211 which are removably inserted in one of the legs 2 as shown in Fig. 1, and it is obvious that by movin this handle throu h one half a circle so t at it will rest on t e other pin illustrated in this view the entire framework'will be turned from the position indicated, to and through a position where its hopper will be elevated and its exit depressed so that dumping will occur, and finally to a osition reversed from that shown. Through t e other trunnion (which is tubular) projects a power shaft 8 driven from any suitable source as a crank handle 80 or a sprocket wheel 81 (to be connected with a 7 source of power, not shown), and this shaft has a bevel gear 9 fast on its inner end just within the adjacent member of the frame 4.

The mixing chamber proper is composed of a double conical drum comprising two cylin- A pieces havin their ends la ping and riveted together. ,1 e larger en of each. cone is deflected inward into a cylindrical flange 130, which fits inside the end of-=the adjacent cyl inder and is riveted thereto as shown. The smaller end of each cone has an opening preferably about eighteen inches'in diameter so that a boy or a small'man can crawl through into the com leted drum and perform work within it. 1 ext outside the smaller end of each cone is located a neck 16 having an in-' ternal diameter of about thirteen inches, from which projects a flange 160adapted to fit outside the truncated end of the cone, to which it is bolted so as to render it removable, and .100

by preference said neck forms the inner mem her of the ball race 5. The numeral 15 designates a hopper preferably having a curved and funnel shaped body whose smaller end 150 projects loosely into said neck and is held therein by screws 17 taking through ears 170 and interchangeably en agmg screw-threaded holes 50 in the fixed bal race 5, a series of balls 14 being into osed between the race 5 and neck 16 as w be understood. From this description it will be clear that by removin the screws 17 the funnel may be reverse and that it can be applied to the neck at either end of the machine although it is ref- --erably attached on that end toward w ich the handle 7 rojects, as shown, and that end of the body ecomes the inlet and the other the outlet. The ball races are preferably 7 connected with the frame by screws 40, and

with the power gear 9 and whose cylindrical portion is connected with the ends of the members 10 and 11 by screws 180thereby holding them alined and connected but permitting their disconnection when desired. As

above'stated, the inner member 11 is preferably a little deeper than the other member 10 so that in covering the meeting line between them the gear ring stands to one side ofa line through the trunnions. This construction is purposely adopted to ut the weight of said ring to that side of a ine through the trunnions which is opposite to the direction in which the handle 7 projects and the neck to which the hopper 15 1s attachedthereby producing a perfect balance of the entire machine=on its trunnions so that a child could rock it or it will stand at rest in any inclined position to which it is set. .This I consider an important detail of construction, in view of the fact that a machine adapted to handle body from the showing about fourteen cubic feet of material wei hs in the neighborhood of 3,500 pounds whic is the weight u on the trunnions. Ifit should so happen t at the power ap lied to the s rocket wheel 81 leads from sue a direction t at it is not convenient to attach the hopper where shown, it can be reversed in the manner set forth above so as to have the inlet and outlet at the relatively o posite ends of the herein, and the removability of the pins 211 is therefore of use in permitting the entire rotation of the body on its trunnions without the necessity for disconnecting the handle. I

It will be obvious that power applied to the crank handle or s rocket will rotate the shaft 8 and gear 9, an .the latter by meshing with the gear rin 18 will cause the drum to turn on its axis which is a line drawn through the centers of said ball races, and it will also be obvious that when this axis stands horizontal the material to be treated can be fed into the hopper and will be mixed, but when the frame is tilted on its trunnions so that the axis stands oblique the material will be dumped out of the exit into a suitable receptacle. r

n connection with the above machine, I preferably employ an agitator consisting of a series of deflectors best seen in Fi s. 4 and 5. As here illustrated, each deflector as a body 20 which is straight across its upper and lower edges but bent back to the rear, and

curved in plan view so that its dished side or mouth stands forward, at both ends of the body are ends 200 whose upper and lower edges r1se obliquel from those of the body and the bodies of t ese ends in plan view extend on straight lines continuin the tangents of the are through which t e body is curved, and the outer extremities 21 of the ends are deflected sli htly outward on a straight line with eac other and which would be on a chord of said are in plan VlGW' and are tipped backward at their u per corners. From the lower edge of the hody depend two feet 22 which are bent to the rear as at 23 and are adapted to be engaged by screws 12 taking through the cylindrical portion of the drum; and from the ends 200 depend two other feet 220 also bent to the rear as at 230 and ada ted to be engaged by screws 120 taking t rough the conical portions of the drum. Thus itwill be seen that there are four points of attachment between each deflector and the drum, and as there are two on either side of the line between the meeting edges of the members 10 and 11 the

screws

12 and 120 assist in holding said members together. The feet 22' and 220 are of sufficient length to hold the lower edges of the bod and ends sli htly above the interior wal s of the cylindrlcal and conical members so as to leave a space through which the liquid in the mixture and some of the finest portions of the latter may pass.

As seen in Fig. 6, when the drum rotates on a horizontal axis, the material is collected from the cones by the ends 200 which converge toward the body 20, and. banks up against the latter where it accumulates unt it tumbles over its rearwardly deflected center.

As seen in Fig. 7, where the drum rotates on an oblique axis, the bulk of the material being agitated is cau ht and handled by one of the ends 200, whi e the body 20 catches so e of it and holds it from said end, and the other end 200 in the then hi her cone is per forming little or no service ence the result is that the material is banked up and dumped the lowermost extremity 21 and drops out some; 2:

the exit. In any event, however, the water and finer particles which pass under the 'deflector constantly scour the inner wall of the drum and keep it cleaned and free of rust. Obviously the precise shape of the bends in the deflector body and its extremities is immaterial, but I consider it desirable that the mouths of all the deflectors shall be presented in the same direction circumfercntially around the interior of the drum.

The use of a machine of this character need hardly be explained in detail, since it is well known to those skilled in the art. The material to be mixed is dumped into the hop er 15 whence it flows through the adjacent neck 16 and falls into the interior of the drum, the rotation of the latter produces mixing by means of the agitator whether the drum stands on a horizontal or an oblique axis, and after the material has been thoroughly mixed the drum is tilted on its trunnions so as to dump the mixed material out of the exit into a suitable receptacle.

All parts are of the desired sizes and pro.

portions, and are preferably of metal to prevent rust.

Such changes in-specific details may be adopted as do not depart from the gist of the invention set forth in the claims below.

What is claimed as new is:

1. In a mixer of the character described, the combination with a drum having reduced ends with tubular necks at their axial extremities, a tilting frame including ballraces withballs surrounding said'necks,said races being interchangeable at opposite ends of the frame and each having screw-threaded holes, and means for rotating the drum on its axis; of a hopper having a funnel-shaped body and a reduced end extending loosely into one of said necks, ears projecting radially from the funnel, and screws taking through said cars into certain of said screw-threaded holes and holding the funnel interchangeably on either race.

2. In a mixer of the character described, the combination with a tilting frame mounted on trunnions, and a power gear; of a drum having a cylindrical body portion made in two members of different widths and having reduced ends, bearings in the frame for said ends, a hopper carried by the bearing which is remote from the meeting line between said members, a gear ring lapping said meeting line to balance the. machine on its trunnions and with its teeth engaging the power gear, and connections between said ring and both members.

3. In a mixer .of the character described, the combination with a tilting frame mounted on trunnions, a handle projecting from one of them, and a power gear; of a drum having a cylindrical body portion made in two members of different widths and having reduced ends, bearings in the frame for said ends, a

hopper carried bythe bearing which is remote from the meeting line between said members and at that end of the drum toward which the handle projects, a gear ringlapping made in two members with their adjacent ends alined and connected, two conical ends each having a flange at its larger extremity riveted to the outer end of one of said members and an opening at its smaller extremity, and two tubular necks each having a flange fitting the smaller end of one of the cones and removably bolted thereto; combined with a tilting frame having ring bearings in which said necks are j ournaled and means for rotating the drum on its bearings.

5. In a mixer of the character described, the combination, with a rotating drum; of an agitator therein consisting of a series of deflectors each having a curved body with its mouth toward the front in the direction of rotation of the drum, diverging ends project ing tangentially from the arc in which the body is struck, and rearwardly deflected outer extremities.

6. Ina mixer of the character described, the combination with a rotating drum; of an agitator therein consisting of a series of'defiectors each having a curved body with its mouth toward the front in the direction of rotation of the drum, the inner edge of the gentially from the arc in which the body is struck, and rearwardly deflected outer extremities standing in line with each other on a chord through said arc. I

7. In-a mixer of the character described, the combination with a drum having a cylindrical body portion and reduced ends, and means for rotating it on its axis; of an agitator consisting of a series of deflectors each having a body secured within the body por-. tion of the drum with its'inner edge deflected to the reacof a radius in the direction of rotation, and forwardly projecting ends secured within the reduced portions of said drum.

8. In a mixer of the character described, the combination with a drum comprising a cylindrical body portion and conical ends, and means forrotating it on its axis; of an agitator consisting of a series of deflectors each comprising a body with its lower edge parallel wlth the cylindrical ortion and ends with their lower ed es para el with the conical ortions of the rum, feet depending from the ody and ends and holding them spaced from the interior of the drum, and means for 4 ,see

the combination with a drum comprising a cylindrical body portion and conical ends, and means for rotating it on its axis; of an agitator consisting of a series of deflectors each comprising a body with its lower edge parallel with the cylindrical lportion and ends with their lower edges para el with the conical portions of the drum, the body being curved to the rear in the direction of rotation and the ends extending obliquely forward from the body in said direction, feet depending from the body and ends and holding them spaced from the interior of the drum, the feet being bent to the rear, and screws taking through said rearward bends and holding the 15 deflectors detachably within the drum.

EVAN B. RAVENCROFT.

Witnesses NEWTON L. OoiLLAMER, EDITH L. SMITH.