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Publication numberUS896070 A
Publication typeGrant
Publication dateAug 11, 1908
Filing dateFeb 11, 1905
Priority dateFeb 11, 1905
Publication numberUS 896070 A, US 896070A, US-A-896070, US896070 A, US896070A
InventorsCharles I Williams
Original AssigneeCharles I Williams
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for drying out molding-flasks.
US 896070 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

No. 896,070. PATENTED AUG. 11, 1908;







Specification of Letters Patent. Application filed February 11, 1905. Serial No. 245,268.

. j Patented Aug.11,'1908.

new apparatus for drying out the sand in molding flasks preparatory to casting, whereby 1the usual drying oven maybe dispensed Wit I In carrying out the invention, I provide an individual heat-producing unit capable of beinginserted into a sand molding flask and I leave. it there until the sand has been dried;

then I remove the unit and proceed with the usual method of casting. This heating unit may be an electric one, a. gas-burnin or a gas-injecting device, a steam-heated evice, or any device which is adapted to produce heat locally within the interior of the mold, and which may be removed from it.

' In the accompanying drawings I have shown various forms ,of heating units adapted for use in carrying out this invention.

Figure 1 shows an electrical heating-device within a pipe molding flask, shown in half for purpose of illustration; Fig. 2 shows a plain gas-burning device; Fig. 3 shows a gas-injecting and burning means; Fig. 4 shows a steam-heated device; Fig. 5 illustrates a method which may be used with pipe molds for drying out a number at a time.

I have illustrated my invention as applied to ipe molding flasks, and itis thus descri ed throughout my specification merely because my invention is particularly applicable for that type of molding flask.

' In Fig. 1 the flask F is as usual lined with wet sand 2. It is generally placed on end in a casting pit after being dried in an oven.

may place it there before drying according to my present invention. Wherever it is, in the pit or outside, I insert a heat-producing unit into the interior of the flask, being careful not todisturb the sand while thus inserting it. In this Fig. 1, the unit P consists of a coil of wire 0 ada ted to be heated by an I electric current. he coil if supported by a steam or vapor, and a hook it to enable the usual foundry crane to handle. the unit.

In Fig. 2 the unit P consists of a cover support S provided with a yoke h and carrycover support S'provided with vents vfor ing on its underside a number of b'ulners b supported on the pipe P which passes out of the cover and suppliessome hydrocarbon mixture to the burners,-- To prevent the flames from impinging directly upon the sand, I .may provide an enveloping cylinder C secured at its top to the support S and provided with numerous openings 0 in its walls.

In Fig. 3 I have shown the heating unit P as an injector I, the flame of which is caused to shoot through the cylindrical mold. If desired this form of heating means may also be provided with a support S and it may carry a cylindrical interior guard C as shown in dotted lines for the purpose described in reference to Fig. 2.

In Fig. 4 I have shown a heatroducing unit P consisting of a hollow dou le-walled drum D through which steam may be circu-. lat-ed through steam pipes 19 p In Fig. 4 I have illustrated a number of molds m placed one on another. It will be obvious that any one of the heating units before described may be placed within such superposed molds, and the method may then be carried out for the number of molds instead of with a single mold as described. The advantage ofthe single mold and'its individual heating unit is that I am enabled to place the flasks in their proper position on the floor of the castin pit, there drying them and not be compelle to again handle them before inserting the cores and casting.

I claim as my invention In combination with a sand molding flask, a cover support having steam vents and a carrying hook, electric heating coils passing I therethrough and adapted to enter the interior of the flask, substantially as described.

In testimony whereof I have signed my name to this specification, in the presence of two subsoribin witnesses.



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4070147 *Apr 1, 1976Jan 24, 1978Chicago Bridge & Iron CompanyMethod and apparatus for post-weld heat treating a tank
US4507082 *Apr 8, 1982Mar 26, 1985Wardlaw Iii Louis JPreheating insert for heavy wall pipe
US4585158 *Nov 23, 1984Apr 29, 1986Wardlaw Iii Louis JMethod of welding using preheating insert for heavy wall pipe
Cooperative ClassificationB22D27/045