US4021168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire mold having washered nails inserted in the vents
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1976-06-18
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Granted: 1977-05-03
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Expires: 1996-06-18
Abstract
Abstract Nails having one or more washers positioned between the nail head and the face of the mold are inserted into the vents of tire molds. The washered nails prevent rubber protrusion from forming in the vents during molding, but allow the escape of air.
Inventors
- 👤 Charles R. Dailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:15
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/10; B29D; B29D30/00; B29D30/06; B29D30/0601; B29D30/0606; B29D2030/0607; B29D2030/0617; Y; Y10; Y10S; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
121 words
A tire mold for imparting a tread design into the surface of a tire while the tire is being cured, said tire mold having vents for the purpose of releasing air which would otherwise be trapped as the uncured rubber is forced into the tread design section of the mold, the improvement which comprises at least one nail having a shank inserted into a mold vent, the nail having a head, at least one washer positioned under the head of the nail, the head of each nail and the at least one washer being inside the mold cavity, each nail being secured into place so that each shank is movable along the length of the vent from zero to 0.125 mm.
Claim 2
Dependent Claim
121 words
A tire mold for imparting a tread design into the surface of a tire while the tire is being cured, said tire mold having vents for the purpose of releasing air which would otherwise be trapped as the uncured rubber is forced into the tread design section of the mold, the improvement which comprises at least one nail having a shank inserted into a mold vent, the nail having a head, at least one washer positioned under the head of the nail, the head of each nail and the at least one washer being inside the mold cavity, each nail being secured into place so that each shank is movable along the length of the vent from zero to 0.125 mm.
Claim 3
Dependent Claim
18 words
The mold of claim 1 wherein the nails are held in place by a bend in the shank.
Claim 4
Dependent Claim
22 words
The mold of claim 2 wherein the nails are held in place by a bend in the shank at the mold exterior.
Claim 5
Dependent Claim
28 words
The mold of claim 2 wherein the nails are held in place by a bend in the shank at the area of the nail positioned within the vent.
Claim 6
Dependent Claim
25 words
The mold of claim 1 wherein the nail contains a protrusion under the nail head which holds the nail away from the interior mold surface.
Claim 7
Dependent Claim
16 words
The mold of claim 5 wherein the protrusion is from 0.025 to 0.125 mm in height.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |