US1838805A - Sand tempering machine - Google Patents

Description

RIE. BRIGGs 1,838,805 SANDv T'EMPERING MACHINE Filed oci. 5. 1927 2 Sheets-sheet l Dec.4 29, 1931.

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Dec@ 29, 1981. R. E. BRIGGS 1,838,805

SAND TEMPERING MACHINE Filed Oct, 5. 1927 2 Sheets-Sheet 2 Eig.

mwgwj UNITED STATES,

Patented Dec. 29, 1931 f PATENT OFFICE i ROBERT E. BBIGGS, OF COLUMBUS, OHIO, ASSIGNOR To THF JEFFREY MANUFACTURING COMPANY, OF COLUMBUS, 0HIO,VA CORPORATION oF OHIO when,V poured into thermold.

SAND TFMBFBING MACHINE Application ld October 5,1927. SeriallNo. 224,231uV 4,The present invention relates to cert-ain new and useful improvements in sand tempering machines` of the type adapted for the preparation ofgfoundry sand. v

,lnfoundry practice molds are ,made of sand and suitable bonding material mixed together with enough moisture to render the mass sufficiently cohesive to'. give to the mold the necessary mechanical strength. This mixture must be of uniform texture and sufficiently porous to permit, the escape of the igases generated by the Amolten .metal Y In -quantity production foundries where lthe processes of molding and casting are continuous, the

molds are broken up as soon as the metal is vsufficiently chilled. The sand is then collected.` and :such ingredients added as are necessary to maintain its character. These-ingredients must be thoroughly incorporated, sufficiently cooled toretain the desired moisture, and stirred andaerated to produce the desiredA porosity. tion is known in theV trade as sand temperlng. t

heespecial object of this invention isto provide an eicient mechanism for tempering the sand While transporting it to the molding oor. f v i `The means wherebyl attain this obj ect are fully set forth in the following specification and illustrated' in the accompanying drawings of which i Fig. lis a'fragmentary plan vlewfof a -sand tempering machine lconstructed in accordance with/my present invention...

Fig. 2 is aside `elevation ofthe machine illustrated in` Fig. y1.

Fig. 3 is a transverse sectional view taken along the line III- III of Fig. 1.

-- Fig.V 2l' is a transverse sectional view taken 'alongV the line.IV---IV'of-Fig.l 1.v view taken*` p Figi `is, a .transverse sectional along the line V-V of Fig. 1.

, Fig. 6 is fa' fragmentary plan viewon-an .enlargedscale ofthe devices Aillustrated in VFigs/landY 5. ,t i t Fig. 7' is a longitudinal sectionalviewtaken along the line VIIe-VII of Fig. '6.

" 'Fig'. `8 isa transverse sectional view illus- This process of preparatrating a modification of the devices illus- Fig.y 9 is a fragmentary plan viewof the devices illustrated in Fig.` 8. .i .Y

Like numerals refer to similar parts in the several figures.` I

Y In the.;drawingsl I have illustratedfone Vembodiment of my invention comprising `an elongated trough along whichV 4the, foundry sand may be propelled fr om the mixing floor,

or` other source of supply, to ,theI molding floor orother points at which the sand will be used, andin. which the sand will bethoroughly kneaded, aerated, cooled, stirred andV mixed to render it suitable for the formation of vfour'idry molds. Thistrough consists of abottom plate 1 along Vthe lateral edges of which are securely fixed two channel bars i 2 which ,serve as the side walls of the Vtrough andasthe main frame for the` machine. PO-

sitioned in the central, longitudinal,A vertical plane of--this trough, and extending-from` end to end thereof, is av rod 3 which fOrrii gidity and lightnessis preferably formed of a steel tubing. Clamped to the rod 3 by the clamping members 4 at spaced intervals along its length, are transversely extending axle vbars 5 each of Awhich is providedwith two flange rollers 6 adapted to engage and roll upon the upper-surface ofthe. channel bars 2 to movably support the rod 3 thereon, and .thereby form a carriage.`

Means are provided forimparting recipjrocatory movement to the` rod 3 longitudinally of theitroughfby` an 'actuating `mechr .anisnr comprising al connecting rod' 7one vend of which engages a wristpin 8A attached to -the rod 3v by'a clamping member` 9 and the other end engages the'crank pin 10 fixed toV a gear wheel `11. The gear wheel-11 is attached Vvto av powershaft12`journaled in bearings 13 of they supporting frame work. The gear Wheel A11 is engagedby a. spur pinion 14 "which is xed to the counter- 'shaft The jcountershaft 15 `also carries a spur gear 1 6 'which is `engaged by an armature'pinion 17 of th'emotor 18.V

The motor 18 may be of anyV preferred-j type suitable to the'con'ditions under which the n'nachine operates. -For purposes of' along. the' trough illustration I have here shown an electric motor which may receive its actuating current from any suitable and convenient source, and which may be controlled by any preferred means, but as such devices are well understood in the art their illustration and description is not thought to be required at this time. Guide bars 19 supported in spaced parallelism above the channel bars 2 engage the supporting rollers 6 adjacent the wrist pin 8 to maintain their contact with the channel bars 2 and thereby insure smoothness of operation.

Clamped to the rod 3 in longitudinally spaced relation are a plurality of raking devices 20 each having downwardly projecting fingers 21 extending into close proximity withthe bottom plate 1 of the trough, and adapted to engage and stir loose material lying upon saidv bottom plate. YPivotally supported by lugs 22 formed on the forward side of the raking devices 20 are-scraper plates23 adapted, as the Vrods move rearwardly, to swing away from the lingers 21 and to slide over the material lying upon the bottom plate 1 and by that sliding movement to smooth down and compact said material. As the rods 3 move forwardly the plates-28-swing into Contact with the fingers 21 and are held rigid thereby to act as scrapers by which the material is propelled along the' conveyor trough.

Positioned within the trough, intermediate certain of the raking devices, as illustrated in Figs. 5 and 6, are rollers 24 having gudgeons journaled in suitable bearings 25 formed on links 2G-which are pivotally attached to cross-arms 27 clamped to the rods 3. As the rod 3 reciprocates longitudinally of the trough the rollers 24 pass over the material lying upon the bottom plate 1- crushing the lumps and compacting the mass to more thoroughly incorporate the ingredients thereof;

Under so-me circumstances greater weight is required to satisfactorily compact the ma.- terial under treatment in the trough than. can be secured with rollers such las are illustrated in Figs. 5 and 6. To met such requirements I1 have provided an alternative construction which is illustrated in Figs. 8 and 9, wherein two rollers 2S of relatively large diameter are positioned one at each side of the reciprocating rod 3. These rollers are journaled upon an axle 29 which is formed integral with a connecting lilik pivotally attached to the clamping memberl secured to thereciprocating rod 3.

In the operation of the machine the several ingredients necessary to the production of molding sand are placed within the trough at its receiving end, and are propelled longitudinally thereof by the action of the pivoted scraper Hight: 23. During their progress these ingredients are thoroughly stirred together by the fingers 21, and lneaded by the retrograde movement of the scraper flight 23 and by the rollers 24 to the end that when discharged at the delivery end of the trough they const itute a homogeneous mass of material suitable for the production of foundry mold.

It is to be understood that I do not limit myself to the precise construction here illustrated and described, since'it is obvious that wide variation may be made as to details without departure from the spirit of my invention.

lVhatI claim is:

1. In a sand tempering machine, the combination with an elongated trough, of a plurality of stirring devices reciprocably. movable longitudinally of the trough and adapted to disintegrate and stirf material upon the bottom of said trough, devices associated Vwith said stirring devices adapted alternately to compact said material and to propel'it longitudinally ot' said trough, and rollers associated with said device and movable in said trough to compress the materialy 2. In a sand tempering machine, the combination with an elongated trough, of a plurality of rakes reciprocably movable longitudinally of said trough adapted to disintegrate and stir materials upon the bottomv of? said trough, plates hinged to said rakes adapted whenmoving in one direction to compact said material and when moving inthe opposite direction to propel said materiallongitudinally of the trough, and rollers associated with said rakes and movable in Vsaid trough to compress the material.

3. In a sand tempering machine, the combination with an elongated trough, of rakes reciprocably movable longitudinally of said trough adaptedto disintegrate and stir materia-ls upon the bottom of said trough, plates hinged to said rakes adapted whenmoving in one direction to propel material longitudinally ofthe trough, and rollers positioned intermediate said rakes and movable therewith adapted to compress materials uponthe bottom of the trough as and for the purposeset forth.

4. In a sand tempering machine, `the combination with an elongated trough, of a plurality of stirring devices reciprocably movable longitudinally of the troughand adapted to stir and propel material along the bottom of the trough and rollers-positionedfintermediate said stirring devices and movable therewith adaptedto compresssaidmaterial upon the bottom ofthe trough'as and for the purpose set forth. Y

5. In a sand temperingmaehine, the combination with a trough, reciprocatory means, a raking device associated therewith and eX- tending' into said trough, and a propelling plate hingedly connected tol saidI reciprocatory. means for'swingingmoveinent in one direction of said reciprocatory means, and for abutment with said raking device upon movement of said reciprocatory means in the opposite direction.

6. In a sand'tempering machine, the combination With a trough, a member reciprocably mounted above said trough, means carried by said member for propelling material longitudinally through said trough, a raking device connected to said member and operated in said trough to stir the material, and a roller hingedly connected to said reciprocatory member for compacting said material in said trough. Y

7 In a sand tempering machine, the combination With a trough, reciprocating means for moving material longitudinally through said trough, rakes associated With said means for stirring material in the trough, and rollers movably associated with said means for compacting the material in the trough.

8. In a sand tempering machine, the combination With a trough, reciprocatory means for moving material longitudinally Vof said trough, rakes associated With said means for stirring material in said trough, and rollers movably associated with said means for com# pacting the material in the trough as it is moved along the trough.

9. In a sand temperingmachine, the combination with a trough, reciprocatory means for moving material longitudinally through said trough, rakes associated'with said means Y for stirring material in the trough, and freely vertically movable rollers movable with said means for compactingy the material in the trough.

l0. In a sand tempering machine, the combination With a trough, reciprocatory means for moving Amaterial longitudinally through the same, rakes associated with said means for stirring material in the trough, an inclinedv link pivotally connected to said reciprocatory means, and a roller carried by said link tov travel in said trough over the material.

l1. In a sand tempering machine, the combination with a trough, reciprocatory means for moving material longitudinally through the same, and a roller pivotally connected toV Y Y said reciprocating means and operating in said trough to compact material therein.

In testimony whereof, I have hereunto set my hand. Y

Y ROBERT E. BRIGrGrS.v

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