US2177048A - Mold - Google Patents

Mold Download PDF

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Publication number
US2177048A
US2177048A US238466A US23846638A US2177048A US 2177048 A US2177048 A US 2177048A US 238466 A US238466 A US 238466A US 23846638 A US23846638 A US 23846638A US 2177048 A US2177048 A US 2177048A
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Prior art keywords
mold
vent
face
opening
openings
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Expired - Lifetime
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US238466A
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Wirtz John
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/06—Permanent moulds for shaped castings
    • B22C9/067—Venting means for moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
    • B22D25/04—Casting metal electric battery plates or the like

Definitions

  • This invention relates to an improved construction of mold for casting storage battery grids and similar devices.
  • An object of the invention is to provide a mold of this type in which the air in the mold and the gases created during the pouring of the molten metal into the mold are permitted to escape by means of novel vent openings of such character that they will not become plugged or clogged with molten metal during the pouring operation.
  • vent holes occurring in the mold throughout the grid-forming portion are formed of large holes of uniform diameter which are formed in the back of the mold to meet a smaller hole of uniform diameter drilled from the face of the mold. It has been found that there is a tendency for the molten metal to clog or plug these holes, and the pouring operation had to be stopped until these vent holes were cleaned out either by melting or drilling out the lead or other material which settled therein.
  • One of the objects of this invention is to provide a means for overcoming this difficulty.
  • Figure 1 shows an end, partly diagrammatic view of my improved mold
  • Figure 2 shows an elevation of the mold face of one of the parts thereof
  • Figure 3 shows an enlarged detail of a portion of the face of the mold shown in Figure 2;
  • Figure 4 shows an enlarged sectional detail of a portion of the mold face shown along the line 4-4 in Figure 3.
  • My mold comprises a pair of separable sections I and 2, each of which is provided with a back 3 and a face 4.
  • a series of vent openings 5 are provided over the areaof the back of the mold. These openings are formed when the mold is cast, or by drilling or otherwise producing a hole which extends from the back of the mold substantially through the entire body 2 thereof, terminating just short of the face 4 thereof.
  • a series of holes 6 are formed in to reach the vent openings 5.
  • These holes 5 are substantially smaller in diameter than the hole 5 and are preferably arranged four in number symmetrically around the axis of the vent hole 5.
  • Each of these openings 5 is tapered as at I, from the base of the opening 5 in the direction of the face 4 of the mold.
  • vents 6 do not become clogged or plugged with molten metal during the pouring operation, since if any metal enters these openings, it quickly drops through into the large opening 5 because the tapered walls I of the vent 6 prevent the material from adhering thereto.
  • a vented mold in which the vents are substantially self-freeing of the molding material which may pass therethrough, said mold having cooperating wall sections to form a molded article therebetween, each vent comprising a large opening extending from the back through a wall of said mold and .terminating short of the face thereof to provide a materially reduced wall portion at said face adjacent said opening, said reduced portion having a short tapered opening extending therethrough, the restricted part of said tapered opening occurring at the face of the mold, the taper of said opening being of a degree sufficient to prevent adhesion to said tapered wall of such molding material as may enter said vent,

Description

2,177,04&
J. WIRTZ Oct. 24, 1939.
MOLD
Filed NOV. 2, 1938 Jjkn Maia,
Patented Oct. 24, 1939 UNITED STATES PATENT OFFiCE MOLD John Wirtz, Port Huron, Mich.
Application November 2, 1938, Serial No. 238,466
the body of the mold member from the face thereof extending therethrough to a depth sufiicient 2 Claims.
This invention relates to an improved construction of mold for casting storage battery grids and similar devices. An object of the invention is to provide a mold of this type in which the air in the mold and the gases created during the pouring of the molten metal into the mold are permitted to escape by means of novel vent openings of such character that they will not become plugged or clogged with molten metal during the pouring operation.
In the molds of this type heretofore used, difficulty has been encountered because of the plugging which occurred in the vents. The vent holes occurring in the mold throughout the grid-forming portion are formed of large holes of uniform diameter which are formed in the back of the mold to meet a smaller hole of uniform diameter drilled from the face of the mold. It has been found that there is a tendency for the molten metal to clog or plug these holes, and the pouring operation had to be stopped until these vent holes were cleaned out either by melting or drilling out the lead or other material which settled therein.
One of the objects of this invention, therefore, is to provide a means for overcoming this difficulty. v
For a more complete understanding of the invention, reference is made to the accompanying drawing in which one embodiment of the invention is illustrated. Throughout the description, like reference characters refer to like parts in the drawing.
In the drawing:
Figure 1 shows an end, partly diagrammatic view of my improved mold;
Figure 2 shows an elevation of the mold face of one of the parts thereof;
Figure 3 shows an enlarged detail of a portion of the face of the mold shown in Figure 2; and
Figure 4 shows an enlarged sectional detail of a portion of the mold face shown along the line 4-4 in Figure 3.
My mold comprises a pair of separable sections I and 2, each of which is provided with a back 3 and a face 4. For the purpose of venting the gases which occur during the pouring operation, a series of vent openings 5 are provided over the areaof the back of the mold. These openings are formed when the mold is cast, or by drilling or otherwise producing a hole which extends from the back of the mold substantially through the entire body 2 thereof, terminating just short of the face 4 thereof. To meet each of these vent openings, a series of holes 6 are formed in to reach the vent openings 5.
These holes 5 are substantially smaller in diameter than the hole 5 and are preferably arranged four in number symmetrically around the axis of the vent hole 5.
Each of these openings 5 is tapered as at I, from the base of the opening 5 in the direction of the face 4 of the mold.
In practice it has been found satisfactory to form the back vent opening 5 about %4" in diameter, and to form shown.
These dimensions are not to be considered as limitations and may be varied, but they are set forth simply for the purpose of disclosing one practical embodiment of the invention. With these dimensions, it has been found that four small vent openings 6 can be supplied to feed each larger vent opening 5.
By the use of this structure, it has been found that the vents 6 do not become clogged or plugged with molten metal during the pouring operation, since if any metal enters these openings, it quickly drops through into the large opening 5 because the tapered walls I of the vent 6 prevent the material from adhering thereto.
Having thus described my invention, I claim:
1. A vented mold in which the vents are substantially self-freeing of the molding material which may pass therethrough, said mold having cooperating wall sections to form a molded article therebetween, each vent comprising a large opening extending from the back through a wall of said mold and .terminating short of the face thereof to provide a materially reduced wall portion at said face adjacent said opening, said reduced portion having a short tapered opening extending therethrough, the restricted part of said tapered opening occurring at the face of the mold, the taper of said opening being of a degree sufficient to prevent adhesion to said tapered wall of such molding material as may enter said vent,
thereby eliminating the stoppage of the vent opening.
JOHN WIRTZ.
US238466A 1938-11-02 1938-11-02 Mold Expired - Lifetime US2177048A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2671948A (en) * 1947-06-21 1954-03-16 Ljungstrom Erik Method of making flint rods

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2671948A (en) * 1947-06-21 1954-03-16 Ljungstrom Erik Method of making flint rods

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