US762597A - Method of tempering molders' sand. - Google Patents

Description

No. 762,597. PATENTED JUNE 14, 1904.

G. W. PAGKER, DECD. u. A. noun. ADMINISTBATRIX.

METHOD OF TBMPERING MOLDERS SAND. APEgIOATIOIILEIgIULY 10. 1901. nmmwnn 90121, 1908.

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" ATTORNEYS PATENTED JUNE 14, 19-04.

'GQW. PAGKER, DEOD. I. A. PAGKER. ADMINISTBATRIX. METHOD OF TEMPERING MOLDERS SAND. APPLICATION FILED JULY 10. 1991. RENEWED OCT. 21, 1903.

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PATENT OEEIcE.

- GEORGE W'. PACKER, OF CHICAGO, ILLINOIS; MARGARET A. PACKER ADMINISTRATRIX OF SAID GEORGE PACKER, DECEASED.

METHOD OF TEMPERING IVIOLDERS SAND,

SPECIFICATION forming part of Letters Patent NO. 762,597, dated June 14, 1904. Application filed July 10,1901. Renewed October 21,1903. Serial No. 177,946.. (No specimens-l To all whom, it may concern:

Be it known that I, GEORGE IV. PAOKER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Method of Tempering Molders Sand, of which i ticity; and the invention has for its object to subject substantially every grain or particle of the sand to the same amount of moisture, whereby the sand will be tempered uniformly throughout and will be entirely free from the dry clots and oversoaked portions that have heretofore made mechanical tempering means ob ectionable and induced foundrymen as a rule to adhere to hand tempering methods.

IVith these ends in view the invention consists in the features of novelty, wh ch will now be specifically described, reference being had to the accompanying drawings, showing a form of apparatus for carrying the process into effect.

In the said drawings, Figure 1 is a vertical longitudinal sectional view of the apparatus by which the method may be performed; Fig. 2 is a plan section of the tempering chamber or compartment, showing the screening device therein; and Fig. 3 is a transverse sectional view thereof, taken on the line 3 3, Fig. 2.

In carrying out my method I subject the sand to the action of steam, preferably in a substantially closed chamber and while the sand is in a state of agitation preferably while the sand is being showered into said chamber-so that the individual grains 0: particles will becomeintimately commingled with the steam and condense a sufficient portion of the steam on theirindividual surfaces to give the sand as a mass the desired degree of dampness and plasticity without producing in the least degree any surplus or free moisture.

It is desirable to retemper the sand after each molding operation, so as to restore thereto the amount of moisture evaporated and driven off by the heatof the metal and by contact with the atmosphere during the molding operation, and to this end it is preferable to employ a screening device into which the molds and the castings may be deposited and which will serve to separate the sand from the castings and enable the sand to be retempered by the action of the steam while the mold is being disintegrated in the separating or screening operation.

In the drawings is shown a hopper 1, into which the mold M, containing castings, may be depositedand which hopper leads into a tumbler 2, composed of a number of parallel bars arranged in the form of a cylinder and with spaces between them and slightly inclined, so that as the cylinder is revolved the sand will be shaken through the spaces between the bars, while the castings will work out at the lower end of the tumbler or cylinder. This tumbler 2 is surrounded by a screen 3, also of cylindrical form, but of a finer mesh than the spaces between the bars of the tumbler 2, and into which cylindrical screen fall the sand and the core-wires. The core-wires work out at the lower end of the screen and may be conducted away by the chute 3 or in any other suitable manner, while the sand falls in a shower into a casing or chamber 4, which also preferably incloses the screening device just described. The screening device may be mounted in this chamber I and provided with means of rotation in any suitable way. The drawings show the ends of the cylindrical screen provided with rims 5, which rest upon four rollers 6, arranged in pairs on shafts 7 8, respectively, the shaft 7 being driven by a train of gears 9 from a driving shaft 10, having pulleys 11, adapting it'to be connected by belt to any suitable source of power.

Through one side of the chamber or casing t projectsone or more steam-nozzles 12, which may be connected to any suitable surce of steam and which nozzles are directed across the showering sand, so as to serve not only for moistening the sand, but for more disintegrating and intimately commingling the sand with the steam.

On the side of the chamber 4: opposite the nozzles 12 is arranged an inclined trough 13, which catches and conducts away the water of condensation running down the side of the chamber, where it is impinged by the steam jets, a similar trough 14: being located on the other side to catch any drip that may occur there. tom of chamber 4 it will be substantially retempered; but in order that it may remain at the bottom of the chamber a short while longer and yet not accumulate there it is gradually worked out of the chamber 4: by any suitable conveyer into a storing-hopper 15, which may be provided with a gate or valve 16 at the bottom for drawing off the sand as desired.

The form of conveyer shown consists of a reciprocating bar 17, havinganumber of pivoted paddles 18 which scrape the sand in one direction, but pass over it when going in the other direction, and thus serve to pull the sand out of chamber 4 and keep it level and evenly distributed in hopper 15. "he bar 17 is supported by swinging hangers 19, and it is reciprocated by crank 20, connected to the bar by pitman 21 and operated by worm-wheel 22 and worm-shaft 23.

By this method it will be seen that the fine particles of sand will be intimately commingled with the steam, and even though they should not be sufliciently cold to condense any material amount of the steam on their indi- By the time the sand reaches the bot' vidual surfaces while within the steam-cham ber the requisite amount of steam nevertheless will be intimately commingled with the sand throughout the entire mass, and whenever it does chill or is subjected to the external atmosphere it will turn into moisture, and the moisture will be at the proper points throughout the entire bulk to temper the sand uniformly without oversoaking or leaving any dry clots.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is

1. The herein-described method of tempering sand which consists in showering the same through a forced stream of steam and catching the tempered sand and free water of condensation separately, substantially as set forth;

2. The herein-described method of tempering sand which consists in showering the same through a forced stream of steam shooting in one direction only and catching the free water of condensation at the end of the stream separately from the tempered sand, substantially as set forth.

3. The herein-described method of tempering sand which consists in subjecting the same to the action of steam and keeping the tempered sand and the free water of condensation separate, substantially as set forth.

GEORGE W. PACKER.

Witnesses:

F. A. HOPKINS, D. (J. GRIMELL.

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