US3813201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shoe molds
Assignee: USM Corp
•
Filing: 1972-05-01
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Granted: 1974-05-28
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Expires: 1992-05-01
Abstract
Abstract A mold for forming an article having a complex shape such as the unitary sole and heel tread member of a woman''s shoe and the method of making same wherein the article to be cast is of a material which is injected into said mold in a liquid form. The mold for such articles is formed of first and second mold members defining a molding cavity therein, and at least one of the mold members in the cavity region has a portion which is formed of a heat-resistant rubbery elastic material such as silicone rubber. When the members are operatively assembled together for molding and one of the mold members may be adapted with a sprue for filling said cavity with the material for casting and conduit means disposed in at least one of said mold members extending from the opening in said cavity region through the mold member to the outside thereof. In preferred embodiments, said conduit means is adapted to be coupled to pressurized, fluid supply means.
Inventors
- 👤 E Frederick
- 👤 A Morse
- 👤 R Simmonds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:07
CPC Classifications
B; B29; B29D; B29D35/00; B29D35/0009; B29D35/0018; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/34; B29C45/37; B29C45/40; B29C45/43; B29D35/0054; B29D35/0063; Y; Y10; Y10S; Y10S425/00; Y10S425/044; Y10S425/812
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
164 words
Mold apparatus for casting an article of plastic material such as a unitary sole and heel tread member for a shoe comprising: A first mold member having therein wall structure forming a molding cavity; said wall structure having a vent opening formed therein; a second mold member cooperable with said first mold member to close said molding cavity for molding; means for supplying said plastic material to said mold cavity for molding; conduit means disposed in said first mold member extending from said opening into said molding cavity to externally of said molding member, and restrictor means disposed in said conduit for inhibiting the flow of molding material through said conduit and including a portion of said conduit formed of a heat resistant, resilient material having a deformable slot formed therein, said slot having a normal unpressurized minimum dimension which inhibits flow therethrough and said resilient material being effective to provide for increase in said slot minimum dimension under increased pressure in said conduit.
Claim 2
Dependent Claim
164 words
Mold apparatus for casting an article of plastic material such as a unitary sole and heel tread member for a shoe comprising: A first mold member having therein wall structure forming a molding cavity; said wall structure having a vent opening formed therein; a second mold member cooperable with said first mold member to close said molding cavity for molding; means for supplying said plastic material to said mold cavity for molding; conduit means disposed in said first mold member extending from said opening into said molding cavity to externally of said molding member, and restrictor means disposed in said conduit for inhibiting the flow of molding material through said conduit and including a portion of said conduit formed of a heat resistant, resilient material having a deformable slot formed therein, said slot having a normal unpressurized minimum dimension which inhibits flow therethrough and said resilient material being effective to provide for increase in said slot minimum dimension under increased pressure in said conduit.
Claim 3
Dependent Claim
26 words
Mold apparatus according to claim 1 wherein said first mold member in the region defining said molding cavity is formed of a heat resistant, resilient material.
Claim 4
Dependent Claim
18 words
Mold apparatus according to claim 1 wherein said heat resistant, resilient material is a room temperature vulcanizing rubber.
Claim 5
Dependent Claim
22 words
Mold apparatus according to claim 1 wherein said normal unparessurized minimum dimension of said slot is in the area of 0.001 inches.
Claim 6
Dependent Claim
29 words
Mold apparatus according to claim 4 which further includes means connected to said conduit means externally of said molding member for supplying a pressurized fluid to said molding cavity.
Claim 7
Dependent Claim
29 words
Mold apparatus according to claim 1 which further includes means connected to said conduit means externally of said molding member for supplying a pressurized fluid to said molding cavity.
Claim 8
Dependent Claim
23 words
Mold apparatus according to claim 6 wherein said pressurized fluid comprises a combination of air and an atomized liquid for lubricating said mold.
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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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |