US1124830A - Sand-reclaimer. - Google Patents

Description

Patnted Jan. 12, 1915.

H. L. ALLEN SAND RECLAIMER.

APPLICATION FILED MAR. 14, 1912. 1,124,830.

THE NDRRIS PETERS CO.. PHOTC-LITHU., WASHINGTON. D. C,

UNITED sTATEs PATEEEE` oEEoE.

HAE-EY L. ALLEN, or ALLIANCE, oH'Io, AssiGNoE To AMERICAN STEEL EQUNDETES 0E `NEW YORK, N. Y., A ooaroEATIo'NL 0E NEW JERSEY'.

specification of Letters Patent.'

"Patented Jan. 12,1915.l

Application filed March 14, 1912. Serial No. 683,757.

To all whom t may concern:

Be it known that I, HARRY L. ALLEN, a citizen of the United States, and resident of Alliance, in the county of Stark and State of Ohio, have invented certain new and use# ful Improvements in Sand-Reclaimers, of which the following is a specification.

My invention relates to the art of metal founding and has particular reference to a device for reclaiming sand after being used in the production of castings in sand molds.

It is well known that in the formation of molds` in which metal castings are made, sand is used to a large extent and this sand to be suitable must have particular characteristics, that is, a certain proportion must be sharp and to this end dust mustl be eliminated therefrom. It has been customary to entirely discard the sand after being once used, and inasmuch as such sand was easily procured the cost was slight; furthermore Y to separate the sharp sand from the dust entailed some expense. However, in largev establishments where extensive founding is carried on the item of sand becomes considerable and for this reason many forms of apparatus have been devised lwhereby the sand after being once used may be treated, to the end that the dust and fine particles may be removed andthe sharp sand returned to the foundry 4for` reuse. IHowever,

the original cost aswell as the cost of opf eration of many of these reclaiming devices has made such processes so expensive that it was equally economical to procure new sand. Inasmuch as `the density or volume of the falling sand is greatest immediatelybelow the baliies, it is proposed to apply the greatest amount of suction to the falling stream of sand immediately beneath the baliies, because it will require a stronger suction or current of air to separate the lighter particles than will be required to effect the separation in the lower portions of the falling stream of sand where the particles of sand have become more `widely separated, and it is for this purpose that the perforations 17 are provided in greater numbers immediately below the baffles 18.

It is the principal object of my invention therefore to provide apparatus which shall efliciently act upon used sand whereby the ne particles may be removed leaving the sharp `sand for reuse. It is a further object to producesuch a machine which shall be simple and inexpensive in construction.v and` economical in operation. VThe principle of'. the present machine is that of allowingl the sand to ypass over a series of baffles whereby the particles areV separated and each thereof exposed toa blast of air,the lighter particles being held in the air in suspension, the heavier parti'- cles1 falling by gravity into a proper receptac e. It will be seen therefore from a 'considerav tion of my invention thatI have provided sand reclaiming apparatus having no movy ing parts and requiring practically no motive power. I 1

.My invention will be more readily un derstood by reference to the accompanying drawings, wherein,

Figure 1 is a central, "vertical section of a device constructed in accordance with my invention; Fig. 2 is a section on the irregular line2-2 elevation.

Referring more particularly to the draw= y ingsjit will be seen that my reclaiming device employs the principle vof gravityythe' only power required is that necessary to of Fig. 1,`and Fig. 3 a front' produce the air blast for proper sepa'rationf,v y

The casing is formed with double walls,` an outer wall 10 and inner ywall ll. At the top the space between the two `wallsis closed by a plate 12, theentire top being fst covered by a screen `13. The outer` wall is provided with an exhaust outlet 14:, and'is perforated to provide sleeves o'r conduits 15, whereby air maybe admitted to the interior of the separator. At the bottom at one side, both walls are terminated to provide a cleaned sand outlet 16.

The inner wall `11 is provided with a `large number of perforations 17, and with inclined baffles or deflectors 18. These deflectors are also perforated at 19, as will be later described. It will be noted that the perforations 17 in the side walls are located more lclosely together just beneath the deflectors v'18. The lowermost dele'ctor 20 is imperforate and acts merely as a chute to direct cleaned sand to the opening v16.

A platform 21 is provided on which sand.v lto be cleaned is placed and a workman standing on the platform shovels sand onto the screen 13. An exhaust fan, not shown, i

being connected with the outlet 14, it will be seen that a blast of airis drawn in through the conduits l5, to the interior of the casing. This air escapes through the openings '17 in the inner wall into the space between the two walls, thence out the opening 14C. The sand after passing through the screen 13, falls on the first defieetor and is broken up, part thereof passing through the openings 19, some falling over the ends onto the defiector therebelow, where the operation is repeated. As the sand passes down through the separator it will be seen that each particle is subjected to a blast of air and if found to be of a weight insufficient to withstand the blast of air, it will be picked up and carried out through the openings 17and the exhaust outlet 14, into a dust collector, not shown, the cleaned sand or heavier particles -being of a weight sufficient to prevent their being held in suspension or carried by the blast of air, will drop through the device onto the deflector 20 andeout the opening 16.

The inclination of the deflectors, the size and disposition of the openings and other details of the construction may be modified, all without departing from the spirit of my invention.

i l claim:

1. In a sand reclaimer, the combination of a pair of casings one within the other in spaced relation, perforated defiectors within said inner casing, said casing being provided with a pluralityT of openings at points beneath each of said defiectors, said openings providing communication with the spaces between said casings, means for partially exhausting the air within said casings and thereby removing dust from the sand, and means for admitting atmospheric air to said inner casing, substantially as described.

2. In a device of the class described, the

combination of a casing, a second casing Copiesot this patent may be obtained for casings, the space between the 'casings being closed to the atmosphere, the inner casing having an inlet at its top for the introduction of' the material to be treated, there being perforations in side walls of the inner casing, bafiies in the inner casing, a suction conduit communicating with the space between the casings, and conduits connecting the interior of the inner casing with the atmosphere.

4i. In a device of the` character described, the combination of inner and outer spaced casings, the space between the casings being closed to the atmosphere, the inner casing having an inlet at its top for the introduction of the material to be treated, one pair of opposite sides of the inner casing having perferations therein, air conduits piercing other sides of the inner easing and cominunicating between the atmosphere and the interior of said casing, bafiies in the inner casing, and .a suction conduit communicating with the space between the casings.

HARRY L. ALLEN.

Vitnesses:

GEO. A. SQHAEFER, HARRY R. BULMER.

five cents elach,vby addressing the Commissioner of Patents,

Washington, D. C.k

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