US891876A - Mixing-machine. - Google Patents

Description

Np. 891,876. PATENTED JUNE so, 1908, J. A. SVENSON.

MIXING MACHINE.

APPLIOATION FILED 00124, 1997.

2 SHEETS-SHEET 1.

n4: mmms PETERS co, WASHINGTON, 04 c.

PATENTED JUNE 30, 1908.

J. A. SVENSON. MIXING MACHINE.

AIPLIOATION FILED 00124, 1907.

2 SHEETS-SHEET 2- ZZZ/77559219.

THE NoRms PETERS co., WASHINGTON, D c.

UNITED STATES PATENT OFFICE...

JOHN A. SVENSON, OF PITTSBURG, PENNSYLVANIA.

MIXING-MACHINE.

Specification of Letters Patent.

Patented June 30, 1908.

Application filed October 24, 1907. Serial No. 398,883.

' In a common type of concrete mixer, the

mixing is done in a trough-like structure by means of paddles revolubly supported in said structure. At the end of each run it is necessary to clean out the concrete adhering to the inner walls of the trough, as otherwise said concrete would set within a short time and interfere with the operation of the machine. Heretofore such cleaning has been difficult and troublesome, especially in the lower portion of the trough, to whichportion the mixing paddles prevent convenient access.

One of the objects of this invention is the provision of means for permitting the mixing chamber of a mixing machine to be readily cleaned. In the present embodiment, which is a concrete mixer, I provide the mixing trough with a bottom section arranged to be dropped into an inclined position and away from the paddles, thus rendering possible a convenient and ra id cleaning of the trough.

The invention a so relates to the other improvements in mixing machines hereinafter set forth.

In the accompanying drawings Figure 1 is a side elevation of the rear end of a concrete mixer embodying the features of my invention. In this view the parts are shown in the operative position. Fig. 2 is a side elevation showing the parts in position for cleaning. Fig. 3 is alongitudinal central section through the rear end of the mixer. Fig. 4 is a rear end elevation with the dumping gate omitted. Fig. 5 is. a section on the plane of dotted line 5 5 of Fig. 3.

An embodiment of my invention may comprise hoppers or other suitable receptacles (not shown) in which the materials to be mixed are placed; a mixing trough 1 in which said materials are thoroughly mixed; andv a screw conveyer 2 for carrying the materials from the hoppers to the mixing trough. It will be understood, however, that a conveyer is not essential, and that any suitable means may be employed for placing in the trough 1 the materials to be mixed. The supporting framework of the machine comprises two frame members 3 and two inclined braces 4 secured at their lower ends to the member 3 and at their upper ends to the upper rear part of the mixing trough 1 at each side thereof. This form of support for the mixing trough provides the space above ground and the overhang necessary to permit of placing wheelbarrows beneath the discharge end of the trough.

The mixing devices herein shown comprise a shaft 5 rotatably supported at its rear end in a hanger 6 and continuously rotated by any suitable means. Said shaft carries a plurality of arms 7 provided at their outer ends with paddles 8, the latter being set at an angle with the plane of rotation so as to force the materials rearwardly in the mixing trough 1 to the discharge end of said trough. A por-' tion of the mixing is performed by the conveyer 2, and as the materials travel through the trough 1 they are more intimately mixed until, when they reach the rear or discharge end of said trough, they are thoroughly com mingled and in condition to be used. The continuous or periodical discharge of the mixed materials is controlled by a dumping gate 9, said gate being pivotally supported at the rear end of the trough 1 and being provided with one or more operating handles 10 by means of which it may be tilted to permit the contents of the mixing trough to be discharged. The dumping gate 9 is shaped so as to make a joint with the mixing trough 1.

The lower portion of the mixing trough 1 is preferably substantially semicylindrical to conform to the path of movement of the paddles 8. To permit of readily cleaning out of the mixing trough at the end of each run, in order that the concrete adhering to the walls of the trough may not harden, the mixing trough is made in two sections, the lower section 11 being in this instance pivotally mounted in order that it may be dropped away from the paddles 8 into position for convenient cleaning. The bottom 11 is herein represented as pivotally supported at its forward end upon a pivot rod 12 and is supported at its rear end by means of two hooks 13 adapted to engage the upper ends of the inclined braces 4. The lower ends of said hooks are screw threaded and pass loosely through openings in the ends 14 of a strap 15 secured to the bottom.

Nuts 1 6 are turned on the ends of the hooks 13 below the ends 14 of said strap. Plates 17 secured to the fixed upper section of the mixing trough 1, one at each side thereof, provide means for guiding the pivoted bottom 11 to its place and close the joints between said sections.

In operation, the materials are thoroughly mixed during their progress through the mixing trough 1, and are discharged from said trough periodically or continuously, as may be desired, into wheelbarrows or other receptacles placed beneath the rear end of the trough. When it is desirable to clean out the concrete adhering to the inner sides of the mixing trough 1, the dumping gate 9 is opened and the upper ends of the hooks 13 are pushed outwardly off the upper ends of the inclined braces 4. The bottom section 11 then drops into an inclined position as shown in Fig. 2. Because of itsinclined position and the abundance of space thus provided beneath the paddles 8, the bottom 11 may now be quickly and easily cleaned. After cleaning, the bottom is readily restored to operative position and secured in such position by engaging the hooks 13 with the upper ends of the braces'4.

It is apparent that various changes may be made in the construction and arrangement of the parts herein shown without departing from the spirit and scope of my in vention.

While I have illustrated my invention as embodied in a concrete mixer, it is obvious that various features thereof may be employed in mixing machines of other forms.

I claim as my invention:

1. In a mixing machine, in combination, a mixing chamber arranged to discharge the mixed materials at one end thereof, said chamber having a bottom pivotally supported at one end; means for releasably securing the other end of said bottom in place; and mixing devices in said chamber.

-2. In, a mixing machine, in combination, a mixing chamber arranged to discharge the mixed materials at one. end thereof, said chamber having a bottom'section pivotally supported at the other end of said chamber;

means for releasably supporting the opposite end of said bottom section; and mixing devices in said chamber.

3. In a mixing machine, in combination, a mixing chamber comprising a fixed section and semicylindrical lower section, said lower section being pivotally supported at one end; means for releasably supporting the other end of said lower section; and mixing devices in said chamber.

4. In a mixing machine, in combination, a mixing chamber arranged to discharge the mixed materials at one end thereof, said chamber having a bottom section pivotally supported at the other end of said chamber; means for releasably supporting the opposite end of said bottom section; a dumping gate at the discharge end of said chamber; and mixing devices in said chamber.

5. In a mixing machine, in combination, a supporting framework; a mixing trough supported at its forward end upon the rear end of said framework; said trough being arranged to discharge the mixed materials at its rear end .and said trough comprising a fixed section and a semicylindrical lower section, said lower section being pivotally supported at its forward end; inclined braces extending from the rear end of said framework to the rear end of the fixed section of said mixing trough; means for releasably connecting the rear end of the lower section of the mixing trough to the upper section thereof; mixing devices in said trough; and

a dumping gate at the discharge end of said trough.

JOHN A. SVENSON. Witnesses:

ALICE A. TRILL, MINNIE M. BOLTZ.

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