Patent US3799494A successfully refreshed from Google Patents.
US3799494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-cavity molds
Assignee: USM Corp
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Filing: 1972-05-11
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Granted: 1974-03-26
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Expires: 1992-05-11
Abstract
Abstract A mold having a plurality of cavities for forming articles having complex shapes such as the unitary sole and heel tread member of a shoe wherein the article cast is of a foamed material such as polyurethane, specific charges of which are injected into the cavities in a liquid form, and expanded therein, each of the articles being expanded to a predetermined size, shape and density standard, the mold for such articles being formed of first and second mold members defining the molding cavities therein. When the mmebers are operatively assembled together for molding, at least one of the mold members is adapted with a sprue connected to a runner system communicating with each molding cavity for partially filling each cavity with the material. Venting means adapted with variable adjustment means extends from within each cavity through the mold member to the outside thereof, said sprue and runner system which leads to each cavity being of predetermined symmetry.
Inventors
- 👤 Lean G Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:01
CPC Classifications
B; B29; B29D; B29D35/00; B29D35/12; B29D35/128; B29C; B29C33/00; B29C33/10; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/42; B29C44/428; B29C45/00; B29C45/17; B29C45/26; B29C45/34; Y; Y10; Y10S; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
197 words
A mold for casting a plurality of articles of foamable material such as unitary sole and heel tread member for a shoe comprising: a first mold member having formed therein at least two molding cavities; a second mold member cooperable with said first mold member to close said molding cavities for molding; a single sprue disposed in said mold for receiving plastic material and joining a runner system for directing said material to said cavities said system having a plurality of branches equal in number to the number of mold cavities, and means for independently controlling that quantity introduced into each of said cavities, of a material introduced into said sprue, said control means comprising a plurality of venting conduits disposed in one of said mold members on the side opposite from said sprue and runner system, each extending from an opening in a respective one of said molding cavities to externally of said molding member, and independently adjustable valve means disposed in each of said conduits for establishing the opening size of each of said conduits at a predetermined value and maintaining the respective opening size of each of said conduits during the said casting process.
Claim 2
Dependent Claim
197 words
A mold for casting a plurality of articles of foamable material such as unitary sole and heel tread member for a shoe comprising: a first mold member having formed therein at least two molding cavities; a second mold member cooperable with said first mold member to close said molding cavities for molding; a single sprue disposed in said mold for receiving plastic material and joining a runner system for directing said material to said cavities said system having a plurality of branches equal in number to the number of mold cavities, and means for independently controlling that quantity introduced into each of said cavities, of a material introduced into said sprue, said control means comprising a plurality of venting conduits disposed in one of said mold members on the side opposite from said sprue and runner system, each extending from an opening in a respective one of said molding cavities to externally of said molding member, and independently adjustable valve means disposed in each of said conduits for establishing the opening size of each of said conduits at a predetermined value and maintaining the respective opening size of each of said conduits during the said casting process.
Claim 3
Dependent Claim
30 words
A mold according to claim 1 wherein said sprue and runner system are arranged generally symmetrical with respect to the flow characteristics thereof as to each of said mold cavities.
Claim 4
Dependent Claim
36 words
A mold in accordance with claim 1 wherein each of said conduits is generally rectangular in cross section and the lesser of the two cross sectional dimensions of said rectangular opening is less than .050 inches.
Claim 5
Dependent Claim
62 words
A mold in accordance with claim 3 wherein said adjustable valve means comprises a cylindrical disc disposed in said one mold member and having a length portion of said conduit formed therein, said disc being rotatable to thereby move said conduit portion out of alignment with the remainder Of said conduit and lessen the minimum cross sectional area of said conduit opening.
Claim 6
Dependent Claim
70 words
A mold in accordance with claim 2 wherein said sprue and said runner system are disposed in one of said mold members in the portion of said mold member intended to be lowermost when said mold is in a casting position and molding material is provided to said mold cavities, said sprue and runner system being thereby disposed below the level of the material when supplied to said mold cavities.
Claim 7
Dependent Claim
36 words
A mold in accordance with claim 3 wherein each of said conduits is generally rectangular in cross section and the lesser of the two cross sectional dimensions of said rectangular opening is less than .050 inches.
Claim 8
Dependent Claim
62 words
A mold in accordance with claim 6 wherein said adjustable valve means comprises a cylindrical disc disposed in said one mold member and having a length portion of said conduit formed therein, said disc being rotatable to thereby move said conduit portion out of alignment with the remainder of said conduit and lessen the minimum cross sectional area of said conduit opening.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |