US783103A - Cement-mixer. - Google Patents

Description

No. 703,103. VPATENTE) P01121, 1905.

CEMENT MIXER.

APPLIOATION `ML110 MAY 12, 1004.

wlmfssfs.- E /m/E/vrofr waak, M M7 JJM y f/w ATTHNEYS UNiTnn STATES Patented February 21, 1905.

PATENT OFFICE.

CEMENT-MIXER.

SPECIFICATION forming part of Letters Patent No. 783,103, dated February 21, 1905.

Application filed May 12, 1904. Serial. No. 207,592.

To all whom, t may concern.'

Be it known that I, ROBERT B. OoL'rRrN,aciti .Zen of the United States, residing at Jackson, in the county of Jackson and State ofiVIichi-A gan, have invented certain new and useful Improvements in Cement-Mixers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it ap- The principal objects are, first, to provide an improved mixing-receptacle and coperating mixer by which the ingredients to be incorporated are thoroughly mixed and at the same time gradually worked and conveyed from the inlet toward the discharge end of the receptacle, the latter being horizontally disposed; second, to support the receptacle so as to avoid clogging of the material or any object between the mixing-blades and the interior walls of the receptacle, and, third, to produce an eiiicient and convenient machine whereby the ingredients can be fed as desired into one end of the receptacle, rapidly and effectively mixed, saturated to proper consistency while mixing, and conveyed and discharged into a suitable receptacle at the opposite end or into a spreader for distributing the composition, as in laying' cement and concrete. l

In the accompanying drawings, which form a part of this specification, the invention is illustrated embodied in a portable cement or concrete mixer adapted for spreading or laying the materialas it is produced. The invention is, however, not confined to this or any specific embodiment, but is susceptible of general utility for mixing ingredients of various kinds of stock, compositions, or products, and the illustrated machine is of course construction illustrated the invention will first be fully described with reference to the drawings and then more particularly pointed out and defined in the annexed claims.

In said drawings, Figure l represents a perspective view of a mixing-machine embodying my invention. Fig. 2 is a detail perspective of the mixer, having spirally-twisted blades. Fig. 3 represents a plan of the conical receptacle in which the mixer rotates.

Referring to these drawings by specific reference-numerals, l represents the main supporting-frame, mounted on side wheels 2 and the front medial guide-wheel 3, with a handle or tongue 4: attached to the shaft thereof. In the central part of the frame is a longitudinally and horizontally disposed conical shell or mixing-receptacle 5 of semicircular crosssection, suspended from theupper part of the frame by rods or by chains 6, attached to apertured lugs in the sides of the receptacle.

The larger end of this mixing receptacle or trough is disposed at the back of the machine and is .lower than the opposite smaller end. Sand, cement, gravel. crushed stone, or ashes or other desired materials are introduced into the smaller end of the receptacle and are mixed and at the same time gradually worked or conveyed by the revolving spiral blades of the mixer toward the larger end, from which they are discharged. This mixing-receptacle may be made integrally or in parts, secured, as shown in Fig. 3, by the bolts 7 on the under side of the receptacle. The lower end, which, as aforesaid, in this case is the larger, is open and is preferably supplied with a spout 8 to conduct the mixed material to the spreader 9. The opposite end may be partially or entirely closed to prevent the loose dry cement and sand from sifting out when first exposed tothe action of the agitator. By supporting or suspending the receptacle loosely,as described, it is given a slight lateral play, which prevents clogging of the material. For instance, if a stone should. accidentally be admitted with the sand between the mixing-blades and sides of the receptacle the latter would move su'fiiciently to allow the stone to pass out instead ofl bending or breaking the blade, as would otherwise occur. The mixer, which revolves closely within said re- IOO . tacle.

ceptacle 5, is of conical form to correspond with the configuration of said receptacle. As shown, itconsists of a central shaft 10, opposite end plates 11 and 12 rigid therewith, and longitudinal mixing-.blades 13, which connect the end plates. This mixer lits rotatably withinvthe receptacle 5, and its shaft 10 is journaled in suitable bearings at the front and rear ends of the machine. Its blades or bars 13 are twisted or spiral, so that in revolving the front portions of the blades are in advance of the rear portions, each blade thus passing into the material in the receptacle progressively from its front to. its rear end. By virtue of the conical shape of the mixer and the twisted or spiral blades when the mixer revolves in the direction of the arrow in Fig. 2 each revolving blade in addition to its mixing function scoops or scrapes up thev dry mass at the smaller end of the receptacle and at the same timeI feeds it toward the larger end, .this action being facilitated also by the rearward downward inclination of the recep- The blades or bars are preferably of steel and have bent terminals riveted to the inner faces of the end plates 11 and 12, though they may be attached in any suitable manner. Thus it is seen that the mixer serves also as a conveyer, and as the mass approaches the larger end of the receptacle it is exposed toa regulated stream of water or liquid whereby it becomes saturated to the proper consistency, the water being mixed therewith by the blades, and its immediate discharge is prevented by the scooping effect of the inclined bars, and a final and thorough mixing is thereby produced.

Rigid with the mixer-shaft 10 and preferably on the outer side of the larger end plate is a sprocket or pulley 14:, connected in a suitable manner to the sprocket 15, whose shaft has a crank 16 or other means for rotating.

Above the mixing-receptacle are several chambers or boxes adapted to hold the ingredients necessary in mixing the concrete or composition and supply the same to the mixing-chamber. In this case these boxes are shown mounted on the top of the frame. The numeral 17 denotes the water-tank, having a regulating-cock 18 and conducting-pipe 19. Numerals 2O and 21 indicate sand and cement boxes, both having lift-doors 22, operated by the projecting levers or handles 23, so that the amount and proportion may be properly regulated either in a continuous or intermittent stream falling into the common spout or hopper 24:, where they are partially mixed before reaching the mixing-tank proper. More chambers may be added, if desired, placed either on top of the machine-frame or at the side or elsewhere, as desired, and provided with suitable spouts for conducting the ingredients, whether crushed stone, cinders, or what not, into the mixing-receptacle.

From the foregoing description the operation of the mixer is obvious. Sand and cement or other ingredients are discharged, as'

D Worked gradually toward the larger end, where the water is added. After becoming saturated and worked to a proper consistency the plastic mass iiows out at the spout Sinto the bed or spreader 9.

If used in making concrete walks and the like, it is very convenient to have the concrete spread and deposited in an even layer at the places desired, and this may be accomplished' eiciently by means of'my improved machine, which is pulled along to allow the composition to flow out and spread from the spreader 9.

I claim as my invention and desire to secure by Letters Patent of the United States- 1. In a mixing-machine of the character described, a horizontally disposed conical trough, and a rotating mixer therein having a conical contour corresponding to the interior shape of the trough, said mixer comprising a shaft with rigid end plates constituting the end walls of the trough and connected by spiral or twisted blades all disposed in the same conical surface.

2. A mixing-machine having, in combination, a frame, a horizontally-disposed receptacle suitably su pported therein having its bottom downwardly inclined, said receptacle being of parti-circular cross-section; a rotary mixer-working in said receptacle comprising' a longitudinally-disposed shaft suitably journaled in bearings in said frame, end disks or circular plates rigid on said shaft and rotatal bly fitted in opposite ends of said receptacle and constituting its end walls, a dischargespout at the lower end of said receptacle below the diskat that end, and mixing-blades rigidly connecting said disks and cooperating with theinterior ofsaid receptacle; and means for rotating said mixer.

3. A mixing-machine having, in combination, a conical troughy or receptacle horizontally disposed with its bottom downwardly inclined toward its large end, and a correspondingly-shaped rotary mixer working therein having longitudinal spiral or twisted mixing- 'blades cooperating with the interior of said IOO IIO

the machine, a rotary mixer working in said trough,ingredient-chambers above said trough adapted to discharge thereinto, and a spreader located beneath the lower discharge end of the trough for\ receiving and spreading the admixture as the wheeled frame is moved along. In testimony whereof I aHix my signature n presence of two witnesses.

ROBERT B. COLTRIN. Witnesses:

W. H. PITCHER, WILLIAM D. WHEAT.

Images