US1565671A - Web-forming attachment for foundry patterns and the like - Google Patents

Description

Dec. 15 1925. 1,565,671

' .T C. H. REEDER WEB FORMING ATTACHMENT FOR FOUNDRY PATTERNS AND THE LIKE Filed April 29, 1925 lh'l/i/YfOR (I #5500? n BY ATTORNEYS Patented Dec. 15, 1925.

UNITED STATES Parser caries.

CHARLES H. REEDEB, OF ST. LOUIS, MISSOURI.

WEB-FORMING ATTACHMENT FOR roUNDnY rarrnnns AND TI-IE LIKE.

Application filed April 29, 1925. Serial No. 26,605.

To all u ham it may concern:

Be it known that I, CHARLES H. Rnnnnn, a citizen of the United States of America, '1v resident of the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Web-Forming Attachments for Foundry Patterns and the like. of which'the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

This invention relates generally to we forming attachments for foundry patterns, and particularly to an attachment which may be associated with a foundry pattern or core box and which, when so associated, will produce an impression in the molding sand, which will result in the formation of a web on the casting or core formed in said molding sand.

In forming many castings, especially steel castings, it has been found to be advisable to provide said castings with strips or webs at various points on said castings,sa1d strips or webs in many cases, though not exclusively, being arranged at corners of the castings and being intended to reinforce the castings at the points where said webs are located. The strips or webs mentioned are known in the art as cracking strips, due to the fact that they help to prevent cracking of the castings at the points where they are located, and also as chilling strips because they provide for the proper cooling of the portions of the castings adjacent to said strips or webs.

Prior to this invention metallic webforming attachments have been employed which were secured to the pattern or core box in such positions as to provide for the formation of webs on the castings, said web-forming attachments heretofore being secured in place on the pattern or core box by means of screws or similar fastening devices. In the case of a very large casting it is often necessary to provide said casting with a very great number of reinforcing webs, and as a consequence much time was consumed heretofore in securing the metallic web-forming attachments mentioned to the of the pattern in which said attachment was seated. It was also necessary to secure each attachment to the wall of the pattern by means of at least two screws. In view of the foregoing, it is apparent that a great amount of time was consumed in securing these web-forming attachments in place oil a pattern which included a great number of said attachments, and as a result the cost of the pattern was increased to such extent that cast ngs were often produced without reinforcmg webs when they were really necessary.

IVith the foregoing in mind, I have produced theweb-forming attachment disclosed in the present application, which, briefly stated, comprises a simple web-forming wing provided with a projecting prong adapted to be driven into the wall of the pattern to secure said web-forming wing to said pattern. In arranging my improved web-forming attachments in place on a pattern much time is saved due to the fact that no screws are employed, as was the case with the attachments formerly used, the only preparation necessary being to drill a hole in the Wall of the pattern, into which hole the prong of the attachment is driven.

With the foregoing and other objects in View, the invention comprises the novel construction, combination and arrangement of parts hereinafter more specifically described and illustrated in the accompanying drawings, wherein is shown the preferred embodiment of the invention. However, it is to be understood that the invention comprehends changes, variations and modifications which come within the scope of the claims hereunto appended.

,Fig. I is a perspective of my improved web-forming attachment.

Fig. II is a view, partly in section and partly in elevation, showing my improved web-forming attachment secured to a pattern or core boX.

Fig. III is a section on line III-III of Fig. II.

Fig. IV is a section on line IVIV of Fig. II.

Fig. V is a section on line VV of Fig. H

In Fig. II of the drawing, A designates a fragment of a foundry pattern or core box, which may include a pair of wall portions B and C arranged at an approximate right angle to each other and secured together in any suitable manner, as, for instance, by a screw D. The angular arrangement of the wall portions B and C is such that a corner E is formed in which the usual fillet F is arranged, said fillet being of the ordinary type usually made of leather, or similar material, and being glued or otherwise secured in place.

Referring now to my improved webforming attachment, 1 designates a webforming wing which may be formed of any suitable material, but preferably is made of metal, said web-forming wing 1 being tapered in cross section as shown clearly in Figs. Ill and IV so that said wing may be drawn out of the molding sand. 2 and 3 designate edge faces of the web-forming wing 1, which in the case of the wing shown in the drawing are arranged at an approximate right angle to each other, and l des ignates a curved face which unites said edge faces 2 and 3. It will be seen by referring to Fig. II of the drawing that the webforming wing is so shaped that it will fit in the corner E formed by the junction of the wall portions B and C, the edge faces 2 and 3 of said wing contacting closely with the adjacent faces of the wall portions B and C. It will also be noted that the face a of the wing 1 is of such curvature that it will contact closely with the curved face 5 of the fillet F.

G designates an opening which is formed through the fillet F and extends into the wall portions of the pattern A. The opening G is approximately round in cross section and is arranged approximately at a angle to the perpendicular. The opening G is preferably formed by drilling through the fillet and into the wall portions of the pattern after the pattern has been completed and the fillet arranged in place thereon.

6 designates a prong which is formed on the web-forming wing 1 of my improved web-forming attachment, said prong being preferably, but not necessarily, formed integral with said web-forming wing. By referring to the drawing it will be seen that the prong 6 is rectangular in cross section, preferably square, and that said prong is provided with a tapered end portion 7.

To arrange one of my improved webforming attachments on a pattern which has previously been provided with the open ing G the tapered end portion 7 of the prong G is introduced into said opening. The web-forming wing 1 is then subjected to pressure or hammer blows, and the prong is driven into the opening G until the edge faces 2 and 8 contact firmly with the adacent faces of the wall portions B and C and the eulrved face l contacts with the curved face 5 of the fillet F, as shown in Fig. II. Due to the fact that the prong is approximately square in cross section and the opening G is approximately round in cross section, and because of the relative dimensions of said prong and said opening, the corners of the prong will be forced into the n'iaterial surrounding said opening G, as shown in Fig. V. This will have the effect of preventing any rotary movement of the prong relative to the wall of the opening and will also provide for a very firm grip between said prong and said wall of said opening, whereby the'web-forming attachment is securely fixed to the pattern.

A very important feature of my inven vention arises from the fact that the fillet F is not severed at the point where the webforming attachment is located, as is the case in connection with the use of other webforming attachments with which I am familiar. On the other hand, I simply form a circular opening through the fillet and thus leave the fillet intact and undisturbed, thereby eliminating the labor necessary to the cutting of the fillet.

To eliminate sharp corners on the casting, I provide the web-forming wing of my improved web-forming attachment with oppositely disposed fillets 8 at the points where the edge faces 2 and 3 and the curved face at meet the side faces of said wing.-

While I have shown and described a web forming attachment adapted to be used in a corner, it is apparent that I may shape my attachmentso that it may be used on flat surfaces.

I claim:

1. In a web-forming attachment for foundry patterns and the like, a web-forming wing having a fastening member united therewith, said fastening member comprising a prong adapted to be forced into a pattern to secure said wing to said pattern.

2. In a web-forming attachment for foundry patterns and the like, a web-forming wing tapered in cross section and having at its relatively thick edge a projecting prong adapted to be forced into a pattern to secure said wing to said pattern.

in a web-forming attachment for foundry patterns and the like, a web-forming wing tapered in cross section and having at its relatively thick edge a projecting fastening member non-circular in cross section adapted to be forced into a pattern to secure said wing to said pattern.

el. In a web-forming attachment for foundry patterns and the like, av web-forming wing tapered in cross section and having at its relatively thick edge a projecting fastening member adapted to be forced in to an opening in a pattern to secure said wing to said pattern, said opening in said pattern and said prong having different cross sectional shapes.

In a web-forming attachment for foundry patterns and the like, a web-forming wing tapered in cross section and having at its relatively thick edge a projecting prong adapted to be forced into an opening in a pattern, said opening in said pattern being approximately round in cross section and said prong being rectangular in cross section.

6. In a web-forming attachment for foundry patterns and the like, a web-forming wing having a projecting prong adapted to be forced into a pattern to secure said wing to said pattern, said wing having edge faces arranged at an angle to each other and a curved face uniting said edge faces.

7. In a web-forming attachment for foundry patterns and the like, a web-forming wing having edge faces arranged approximately at a right angle to each other and a curved face uniting said edge faces, and a prong formed integral with and projecting from said wing at said curved face, said prong being adapted to be forced into a pattern to secure said wing to said pattern.

8. In a foundry pattern and the like, wall portions arranged at an angle to each other so as to form a corner, a fillet in said corner, said pattern being provided with an opening circular in cross section which extends through said fillet and into a wall of the pattern, and a web-forming attachment,

said web-forming attachment comprising a wing having edge faces adapted to contact with faces of said wall portions, a curved face uniting said edge faces and adapted to contact with a face of said fillet, and a prong formed on said wing and projecting from the curved face thereof, said prong being rectangular in cross section and being forced into said circular opening in said pattern to secure said wing to said pattern.

9. In a foundry pattern and the like, wall portions arranged at an angle to each other so as to form a corner, a fillet in said corner, said pattern being provided with an opening circular in cross section which extends through said fillet and into a wall of the pattern, and a web-forming attachment, said web-forming attachment comprising a wing having edge faces adapted to contact with faces of said wall portions, a curved face uniting said edge faces and adapted to con- CHARLES H. REEDER.

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