US1001729A - Concrete-mixing machine. - Google Patents

Description

O. BUCHANAN & M. JARVIS. CONCRETE MIXING MAGHINE. APPLICATION FILED NQV. 4,1910.

1,001,?29 7 v Patented Augr29, i911.

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1,001,729. Patent ed Aug. 29,1911.

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G. BUUHANAN 6; M. JARVIS.

) CONCRETE MIXING MACHINE. APPLICATION FILED NOV. 4, 1910.

Pater lted Aug. 29, 1911.

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uring feed scoops or boxes are identical in construction, and We will therefore only describe one ofthem.

Each feed scoop or box comprises a curved outer wall L2 which is concentric with the mixing cylinder, and side walls 43 provided with outstanding flanges tat,

which are secured by screws or bolts 45 to the cylinder. The front end according to the direction of the rotation of the mixing cylinder indicated by the arrow in Fig. 3, of each feed scoop or box is open, and its rear end is also open. In the rear portion of each feed scoop or box is a gage element- 46, forming a movable closure therefor, and provided with a curved arm 4:7 which bears on the outer side of the mixing cylinder and is provided with a longitudinal slot as engaged by a bolt 49 which secures the said arm and hence the said gage element to the mixing cylinder and enables the gage element to be adjusted so as-to vary the capacity of the measuring feed scoop or box in which the said gage element is disposed. Hence the effective cubic capacity of the feed scoop orbox may be regulated at will, by appropriately adjusting the gage element thereof, so that each feed scoop or box may be, at each revolution of the mixing cylinder, caused to deliver a certain predetermined quantity of material thereto It will be observed that as the mixing cylinder rotates in the direction indicated by the, arrow, each feed scoop or box as it moves through one of the compartments ,inthe hopper Will become filled with material.

For each feed opening of the mixing cylinder, we provide an automatically act: ing closure element such as indicated at 511 The said closure elements are segmental in form and curved on an arc corresponding with the inner surface of the mixing cylinder, and the said closure elements are suf- ,ficiently' large to entirely cover the feed openings in the mixing cylinder when the said closure elements bear against the inner surface of said cylinder. Each closure ele ment has a bent arm 54 attached thereto asat 55, the opposite end of the said bent arm beingz'pivotally mounted as at 56 between a pair of lugs 57 of a plate 58, the said plate being bolted to the inner side of the mixing cylinder as at 59, at a suitable point and being provided at one end with a stop- (30 to limit the movement of the said bent arm in one direction. I

. 'It will be observed by. reference to Fig. 3

elements by their own gravity as the pivoted ends of their arms nove upwardly, by the rotation of the mixing cylinder close against the inner side of the mixing cylinder, and cover the feed openings so that while the feed scoops or boxes become filled with the material, asthey move through the mass of the same, in the hopper, the material remains in' the said feed scoops or boxes until thesame is movedv upwardly out of the hopper at which time the pivoted ends of the arms 54 of the closure elements are uppermost and hence said closure elements by their own gravity swing inwardly 1n the mixing cylinder, uncover the feed openings thereof, and permit the material to drop from the feed scoops or boxes into the mixing cylinder.

In the side of the mixing cylinder opposite the feed openings is a series of obliquely disposed blades 60 which act to urge the material rearwardly in the mixing cylinder as the latter rotates, and cause the material fed to the cylinder by the feed scoop or boxes, andmixed by the returning of the cylinder, to be discharged from the open, rear end of the said cylinder, as will be understood.

A tank or reservoir 61 is secured on the upper portion ofthe yoke bar 8 and is proyided with a pipe 62 which leads into. the

rear end of the cylinder and is provided with perforations which spray water on the material mixed in the cylinder. This pipe is provi ed with'a suitable regulating valve 63 by means of which the quantity of water supplied 'to the mixed material may be regulated as may become necessary. Since each feed box or scoop becomes tilled with material at each revolution of the mixas provided at opposite sides of the machine w'ith screens 6% for screening the sand as it is thrown into the said compartment. iVe' also showa 'pivotally mounted hood 65 at the rear discharge end ofthe mixing cylinder. This hood when lowered collects the material discharged from the mixing cylinder and when raised dumps the same.

While we have herein shown and described What'we now "regard as the preferred embodiment of our invention, we. would havefit understood that changes may be made in the form proportion, and construction of the parts, and'that modifications may be made Within the scope of our invention asdefined by the appended claims.

'WGCifliHli-r j I 1. In a machine of the class described, in

combination with a hopper, a revoluble mixing cylinder having a feed scoop or box on the outer side thereof, and communicating therewith, the said feed scoo orbox being open at its front and rear si es, and a gage element to form a closure for the rear side of the feed scoop or box, movable in said feed scoop or box, and provided on its rear side With a curved armbearing on'the outer side of the mixing cylinder, and means seing with said mixing element, and an auto.-.

Witnesses: ing element for cutting off communication between said feed scoop or box and said niatically acting closure carried by the mixmixin element at one period of the rota tion 0 the latter.

3. In 'a machine of the class described, a

- revoluble mixing element having a feed scoop or box on 1ts outer slde, and automat1-- cally acting means carried by the mixing element for cutting off communication between said feed scoop or box and said mixing element at one period of the rotation of the latter.

4. In a machine of the class described, a revoluble mixing element having a feed opening, a feed scoop or box on said mix-- ing element, and communicating therewith through said ,feed opening, and a pivotally mounted closure element in the mixing eleme'nt acting vby gravity to close said feed opening during one period of the rotation of said mixing element.

In testimony whereof We hereunto aflix our. signatures in the presence of two Witnesses.

CHARLES BUCHANAN. MARION JARVIS.

CHANCE E. DEWALD, OLIVE MCCARTHY.

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