US1034335A

US1034335A - Method of and apparatus for making cores.

Info

Publication number: US1034335A
Application number: US65916011A
Authority: US
Inventors: John C Bannister
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-11-08
Filing date: 1911-11-08
Publication date: 1912-07-30
Anticipated expiration: 1929-07-30

Description

J. G. BANNISTER. METH OD OF AND APPARATUS FOR MAKING corms.

I APPLICATION FILED NOV. 8, 1911.

Patented July 30, 191.2.

2 SHEETSSHEET 1.

J. G. BANNISTER.

. METHOD OF AND APPARATUS FOR MAKING 0033s.

APPLIOATION FILED NOV. 8, 1911. I 38116. 11y 1,034,335 P1: tdJl 301912 v v 2 2 3HEBTSSHEET 2.

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7 2 7 6 7 hm IQ I! I 5 & /0 a 1 1 //4 12 /2 3 WITNESSES 5 F|G.3' Y INVENTOR g I .XZQM

. position lll'tlle molds green sand cores 1s made radiant ossioiz.

JOHN o. eaivni's'rea, or Kswaims, iiimucis.

METHOD 0F AND APPARATUS FQR MAKItNG CORES.

To all whom it may concern:

Be it known that l, JOHN C. BANNISTER, a citizen of'the United States. ofAmerica, residing at Kewauee, in the county ofHenry and State of Illinois, have invented a new and useful Method of and Apparatus for Making Cores, of which the following is a specification.

My invention relates to the manufacture of cores used in molding,- and more. particularly relates to a method'of making green sand cores used later in the manufacture of castings such aspipe fittings and similar articles and to novel apparatus constructed and arranged for use in carrying out my improved method.

Heretofore, it has been attempted to mamitacture green sand cores by means of an. air blast or the use of air under pressure, but such attempts have lieeu UIlSllCCQSSfUl on account of inability to pack the sand uniformly within the core-boxes and the failure to obtain cores of uniform density. 1 have discovered the invariable failure of such methods of making green sand cores is on account oi the sand being introduced into the core-box. cavities through openings or holes extending transversely or at an oblique angle to the ax of the cores, and owing to the necessary change in direction of the flow of the sand after entering the core-box whichprevents the desired equal packing and uniform density of the sand.

' One object of my invention is to provide a novel method of making cores of green sand whereby the sand is compacted within the cavities of the core boi: and by which cores of uniform density are made.

Another object or' this invention is to provide a novel method of making green 'sand cores by the use of which a series of the cores can be simultaneously formed and later transferred from the core-boxes into for the later casting operation. v

A further object of my invention is to provide apparatus for making green sand cores by theluse of which my improved methodis employed and the manufacture of possible.

Referring to'the' drawings, Figure 1 is a plan, partly in section, the section being taken on the line l-I of Fig. 2, showing a two-part core-box split lengthwise and hav ing a plurality of core-forming cavities. Fig. 2 is a longitudinal section on the ir- Specifioetion of. Letters Patent Application-filed November equally I Tlie'lower end of Patented July 30, 1912.

s, 1911. Serial No. 659,160.

regular line Il II of Fig. 1 showing the two-part core-box,' as assembled'and applied for'use to the sand boot of a molding machine from which. the molding sand is supplied in forming the cores in accordance with my improved method. Fig-3 is a sectional end view on the irregular line lll-ll1 of Fig. 1 showing the apparatus illustrated in Figs. 1 and 2.v

In the drawings, the

numerals

2 and 3 designate the top and bottom sections of a sectional. or two-part core-box which is divided or split lengthwise. The cont-acting faces of the sections 2 and registering cavities forming a'plurality or ooreboxes 41 constructed and arranged for molding or forming cores, the'particular cores shown being used in making pipe fittings known astees. The multiple core-box formed of the

sections

2 and 3 is arranged for use with the sand boot 5 of amolding machine and the bottom plate 6 of the sand boot 5 has a series of openings or holes 7 provided therein through which the sand ered into h core-loos.

tierured on the lower face of the bottom plate 6 is a series of drop tubes 8 and 9, one for each vertical opening 7, having longitudinally inclined or tapered faces. The drop tubes 8 are arranged to extend downwardly so that the vertically inclined taco thereon. forms the end walls which determine the length of the cores formed in the core-hos. The double drop tubes 9 also employed have. opposite inclined faces ar ranged: to determine the length of the branch on the type of core shown. The drop tubes 8 9' are secured on the lower face of the bottom plate 6 of the sand boot 5 and each'tube' has vertically extending opening or passage 1.0 registering with one of the openings or passages 7 extending transversely through the bottom plate 6.

tubes 8 and 9 extends into transversely'ex tending passages 11 or 12 on the lower end of the drop tubes, the transversely extend ing passages 11011 the tubes 8 and passages on the tubes 9 being arranged toiextend axially in lines parallel with the longitudi nal. axes of the core-box cavities and the cores formed therein. I t

it will be seen loy reference to Figs. 2 and iii-hat the passage extending through 1 the drop tubes changes the direction of flow 3 have aseries of in. the boo 5 is discharged in being deliv the passage 10 in the drop in lines or paths formed.

spaced therein in such the core-box. The bottom section 3 of the core-box'isprovided with handles or lugs 14 of the sand in its boot 5 into the core-boxcavities, so that the sand enters into and travels in the core-box substantially parallel to the longitudinal axes. of" the cores being The core-

hex sect ons

2 and 3 are provided with a series of openingsfor holes 13 manner as'to reg ister with the drop tubesS aniiQeXtending downwardly therethroughf; from the lower or outer surface of the bottom plate 6 into by which it is manipulated and transferred manually from place to place. The core-box section 3 is also provided with the dowel -d pm openings 15 in the lugs 16 to insure registration of this core-box section withthe dowel pins on the flask in transferring the series of cores from the core-box to the mold. [In making green'sand cores in accordance with my improved method, the

sections

2 and 3 of the core-box are assembled or booked with the coreforming cavities in registering position. The upper surface of the top section 2 of the core-box is then brought into engagement with the lower drop tube 8 or 9 opposite the times caused to enter the f "within the surface" of the bottom-plate 6 on the sand boot 5 of a molding machine. The drop tubes 8 and 9 on the bottom-plate 6 project through the openings 13 in the sections of the core-box so as to bring one face of a end of a cavity forming each branch on the core for the pipe fitting orother article being made. The faces of the drop tubes are made tapering to facilitate removal after the cores have been formed and to afford a neat fit between the faces of the droptubes and the openings 13 in the core-boxes into which they extend, the tubes substantially filling the openings or holes 13' The said boot 5 having been filled with sand which has been properly tempered or prepared, the sand is then forced or carried from the boot into the core-box cavities by means of air admitted thereto under pressure in accordance with the method of using the apparatus.

As the sand enters the series of openings or passages in the drop tubes the direction in which it passes is changed within the drop tubes 8 and 9. The sand is at all core-box cavities rom the drop tubes in paths substantially parallel to the longitudinal axes of the core-box and cores, the air entering the corelcox, depositing the sand in the core-box, b h fcrevices or openings etween t e enga aces of the drop tubes. By so doing, ilih sand is uniformly distributed and equally packed formed thereoi" are of uniform density. It

will hy reference to the drawings" passage from the sand the end portions corehox cavities" and the cores that the sand is built; up in forming the cores from the center of the cores toward the ends' of the cores and any branches thereon are-last formed, which assists In securing the, desired uniform density.

The advantages of'my invention will be apparent to those skilled in the art. By the peculiar manner of introducing or forcing the sand into the core-box cavities, cores made of green sand are formed which are of uniform density, a result not heretofore obtainable.

Modifications in the construction and arrangement of the apparatus for carrying out my improved method may be made without eparting from the invention as defined in the claims.

I claim 1. The method of making green sand cores consisting in introducing the sand into a core-box by means of fluid pressure, said sand'being introduced in paths parallel to the longitudinal axis of the cores from op.- posite ends thereof to thereby equally pack the sand and form cores of uniform density.

2. The method of making green sand cores consisting in introducing the sand under fluid pressure into core-boxes from the ends toward the common axial center of the cavitiesin which the cores are formed in paths parallel to the axes of the core cavities.

3. The method of making green sand cores consisting in introducing the sand under fluid pressure into a core-box from opposite ends of the cavities in which the cores are formed and in paths parallel to the axis of the cores.

4.In apparatus for making green sand cores, the combination with a core-box having a plurality of openings leading thereinto and a sand-boot to supply sand to said core-box, of means on said. sand-boot ar ranged "to -deliver the sand through said openings into said core-box in opposite directions and in paths parallel to the longitudinal center of the core formed in said core-box.

5. In apparatus for making green sand cores the combination with a core-box having a plurality of core-forming cavities therein, and openings leading into said c'oreforming cavities and a sand-boot to supply sand to said cavities, of means on said sandboot arranged to simultaneously deliver the sand through said openings into said cavities from the ends thereof in paths parallel to the longitudinal axes of the multiple cores formed in'said core-box.

6.111 apparatus for making'green sand thereof and 'in this way 4 cores the combination with a core-box hav- .1ng a plurality of core-formingcavities therein, and opposite openings leading into said core-box cavities and a sand-boot to sai sand-boot'arranged to simultaneously I deliy'erithe sand through said openings into saldcavitiesin opposite directions and 'in' a-paths parallel to the longitudinal'axes of the multiple cores formed in said core-box.

7. In apparatus for making reen sand coresthe combination withacoreox having an opening leading thereinto and a sand-boot 10 to supply sand to said core-box, of a drop tube or blow plug on said sand-boot arranged to deliver the sand through said opening into said core-box in a path parallel to the longitudinal center of the core in 15 making the core.

8. In apparatus for inaking green sand copies of this pateiit may be obtained su sand to said core box, of means on through said'openings into said cavities in paths parallel to the longitudinal axis or the multiple cores formed in said core-box; In testimony whereof, I have hereunto set my hand.

JOHN C. BANNISTER. Witnesses:-

Fnnn J. TALBO'1'I,. A. F. HARRISON.

for in cents each, by addressing the "Commissioner of Patentl,

'Washington, D. (2.