US3894575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density carbide stud
Assignee: Textron Inc
•
Filing: 1974-04-15
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Granted: 1975-07-15
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Expires: 1994-04-15
Abstract
Abstract A tire stud is formed by filling a tubular rivet, from its open end, with tungsten carbide grit of a relatively large particle size. After tamping and vibratory compacting of this grit the voids between the grit particles are filled with carbide grit of a substantially smaller particle size by vibratory techniques. The skeleton thus formed is filled with a molten matrixing metal and then cooled. The stud exhibits wear properties which approximate those of a rubber tire in which it embedded so that the end of the stud projects slightly beyond the tread surface of the tire during the life of the unit.
Inventors
- 👤 Charles S Baum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:21
CPC Classifications
B; B60; B60C; B60C11/00; B60C11/14; B60C11/16; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12007
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
THE METHOD OF MAKNG TIRE STUDS CONSISTING OF FILLING A TUBULAR CASING WITH TUNGSTEN CARBIDE GRIT OF A RELATIVELY LARGE PARTICLE SIZE, COMPACTING SAID GRIT, INFILTRATING THE VOIDS BETWEEN SAID GRIT WITH TUNGSTEN CARBIDE GRIT OF A SUBSTANTIALLY FINER AVERAGE PARTICLE SIZE, FILLING IN THE VOIDS IN THE SKELETON THUS FORMED WITH A MOLTEN METAL AT A TEMPERATURE LESS THAN THE
Claim 2
Independent Claim
61 words
THE METHOD OF MAKNG TIRE STUDS CONSISTING OF FILLING A TUBULAR CASING WITH TUNGSTEN CARBIDE GRIT OF A RELATIVELY LARGE PARTICLE SIZE, COMPACTING SAID GRIT, INFILTRATING THE VOIDS BETWEEN SAID GRIT WITH TUNGSTEN CARBIDE GRIT OF A SUBSTANTIALLY FINER AVERAGE PARTICLE SIZE, FILLING IN THE VOIDS IN THE SKELETON THUS FORMED WITH A MOLTEN METAL AT A TEMPERATURE LESS THAN THE
Claim 3
Dependent Claim
31 words
The method of making tire studs of claim 1 wherein said tubular casing has one closed end and one open end and wherein said casing is filled from the open end.
Claim 4
Dependent Claim
40 words
The method of making tire studs of claim 1 wherein the ratio of the average maximum dimension of the relatively large particle size grit to the average maximum dimension of the substantially finer particle size grit exceeds three to one.
Claim 5
Dependent Claim
27 words
The method of claim 1 wherein the average large dimension of the relatively large particle size grit exceeds half the average interior dimension of the tubular casing.
Claim 6
Dependent Claim
57 words
The method of claim 1 wherein the step of filling in the void in the skeleton thus formed with a molten metal at a temperature less than the melting point of the casing or the grit is performed by filling the voids in the skeleton by powdered metal and heating the powdered metal to its melting point.
Claim 7
Dependent Claim
60 words
The method of claim 1 wherein the step of filling in the void in the skeleton thus formed with a molten metal at a temperature less than the melting point of the casing or the grit is performed by filling the voids in the skeleton thus formed with powdered metal and inductively heating the powdered metal to its melting point.
Claim 8
Dependent Claim
49 words
The method of making tire studs of claim 1 wherein the step of filling in the void in the skeleton thus formed with a molten metal at a temperature less than the melting point of the casing or the grit is performed by pouring molten metal into the casing.
References Cited (Backward Citations)
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Cited
US3258817A
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US3360347A
Cited
US3480062A
Cited
US3684497A
Cited
US3768984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |