US2025404A - Sand core forming apparatus - Google Patents

Sand core forming apparatus Download PDF

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Publication number
US2025404A
US2025404A US731155A US73115534A US2025404A US 2025404 A US2025404 A US 2025404A US 731155 A US731155 A US 731155A US 73115534 A US73115534 A US 73115534A US 2025404 A US2025404 A US 2025404A
Authority
US
United States
Prior art keywords
sand
container
forming apparatus
compressed air
core forming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US731155A
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English (en)
Inventor
Stahn Albert
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Individual
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Individual
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Filing date
Publication date
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Publication of US2025404A publication Critical patent/US2025404A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
    • B22C15/245—Blowing tubes

Definitions

  • My invention refers to sand -core and mold forming apparatus and more especially to apparatus of the kind described, in which the sand or the like contained in a sand container is suppiied to the core box or mold by means of compressed air. 1
  • My invention vhas particular reference to the means for feeding theair'to the sand container and it isan object of my invention to provide 'air ,0 feeding means which are more efilcient than those hitherto in use.
  • the container in which a supply of molding sand or the like is stored, is hitherto supplied with compressed air through an opening or openy5 ings in the cover of ⁇ .such container. It is well known to every person skilled in this art, that on admitting compressed air through this opening,
  • cavities or funnel-shaped channels will form in the sand, which extend substantially in a straight line -from the air inlet to the sand outlet formed "in the bottom of the container. These channels thus follow .the path of least resistance. It is equally known'that thesefunnel-shaped channels prevent a considerable part of the sand from be- 5 ing expelled from the container, more especially in the case of sand containing-clay or so-called green molding sand, for the compressed air will frce the sand against the side walls of the container, and the sand will then stick to these walls,
  • stirrers have been-provided in these containers; however these stirrers require a separate drive consuming energy and are exposed to rapid Wear.
  • the use of these and -35 other contrivances has not suiced to enable the compressed air to expel all of the sand.
  • the means provided according tothe present invention solve this problem in the simplest and most eflicient manner Without requiring any energy, since the invention utilizes the repulsion effect exerted by the compressed air entering the container on a flexible tube, the free end of which is caused, by this repulsion effect, to continuous- 45 ly change its position relative to the body of sand in the container, so that no ldistinct channels can be formed therein.
  • I may use rigid tubes movably suspended in the container so as to allow them to move under the 5prepulsion effect exerted on their ends by the compressed air.
  • Fig. 1 is a vertical axial section of a funnelshaped sand container equipped with a exible air admission tube.
  • Fig. 2 is a. similar view of a modification, in 5 which the air is admitted through two movably suspended rigid tubes.
  • I is the funnel-shaped sand container
  • 2 is the 'execute jerky movements, whereby the free end 20 ofthe tube is continuously displaced on the surface of the body of sandin the container, thereby preventing the formation of the funnelshaped channel indicated in the sand by dotted lines.
  • the movable sand vadmitting means shown and described will direct the compressed air onto ever varying points of the body of sand, Y thereby preventing any sticking to the walls and the formation of definite cavities or channels.
  • the term wall as used in the claims is intended to include the removable cover of the sand container. 45
  • I claimzv 1 In an apparatus of the kind described the combination, with a sand container, -of a compressed air admission tube passing through and iixed inV a wall of saidfcontainer, the end of said tube, which projects into said container, being free under the repulsion eil'ect exerted on it by the compressed air, to be automatically displaced relative to the sand in the container.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Soil Working Implements (AREA)
  • Air Transport Of Granular Materials (AREA)
US731155A 1933-06-27 1934-06-18 Sand core forming apparatus Expired - Lifetime US2025404A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2025404X 1933-06-27

Publications (1)

Publication Number Publication Date
US2025404A true US2025404A (en) 1935-12-24

Family

ID=7978552

Family Applications (1)

Application Number Title Priority Date Filing Date
US731155A Expired - Lifetime US2025404A (en) 1933-06-27 1934-06-18 Sand core forming apparatus

Country Status (2)

Country Link
US (1) US2025404A (fr)
FR (1) FR774900A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682690A (en) * 1950-06-05 1954-07-06 Mcwane Cast Iron Pipe Co Apparatus for blowing sand lined molds
US3290733A (en) * 1962-02-26 1966-12-13 Osborn Mfg Co Mold and core blowing machine
US3942689A (en) * 1973-04-02 1976-03-09 Johns-Manville Corporation Apparatus for removing compacted fibrous materials from containers
US3958722A (en) * 1974-11-20 1976-05-25 Acf Industries, Incorporated Self indexing elbow
US4023780A (en) * 1975-09-03 1977-05-17 Egid Eugene I Method of mixing and apparatus therefor
US4466558A (en) * 1979-04-23 1984-08-21 Acf Industries, Incorporated Aerator control arrangement
US4942982A (en) * 1986-11-07 1990-07-24 Hartwigsen Wesley D Silo cleaning apparatus
US20080037364A1 (en) * 2004-03-15 2008-02-14 Frederic Dietrich Method and Device for Pneumatic Treatment of Powder Materials

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682690A (en) * 1950-06-05 1954-07-06 Mcwane Cast Iron Pipe Co Apparatus for blowing sand lined molds
US3290733A (en) * 1962-02-26 1966-12-13 Osborn Mfg Co Mold and core blowing machine
US3942689A (en) * 1973-04-02 1976-03-09 Johns-Manville Corporation Apparatus for removing compacted fibrous materials from containers
US3958722A (en) * 1974-11-20 1976-05-25 Acf Industries, Incorporated Self indexing elbow
US4023780A (en) * 1975-09-03 1977-05-17 Egid Eugene I Method of mixing and apparatus therefor
US4466558A (en) * 1979-04-23 1984-08-21 Acf Industries, Incorporated Aerator control arrangement
US4942982A (en) * 1986-11-07 1990-07-24 Hartwigsen Wesley D Silo cleaning apparatus
US20080037364A1 (en) * 2004-03-15 2008-02-14 Frederic Dietrich Method and Device for Pneumatic Treatment of Powder Materials
US8834011B2 (en) * 2004-03-15 2014-09-16 Dietrich Engineering Consultants S.A. Device for pneumatic treatment of powder materials

Also Published As

Publication number Publication date
FR774900A (fr) 1934-12-14

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