US3662436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw anchor
Assignee: Joslyn Manufacturing and Supply Co
•
Filing: 1970-12-28
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Granted: 1972-05-16
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Expires: 1990-12-28
Abstract
Abstract A screw anchor used in securing a guy wire to the ground includes at least one helical cutting blade attached to a generally square-shaped shaft, one end of which is pointed to facilitate the insertion of the screw anchor into the ground. Located near the other end of the shaft is a generally circular cross-sectional groove which forms an installation hub out of the other end of the shaft, and which is designed so that the torsional ultimate strength of the shaft at the groove is less than the torsional yield strength of the full square-shaped shaft. Extension rods are connectable to the end portion of the shaft forming the installation hub for increasing the length of and securing the guy wire to the screw anchor.
Inventors
- 👤 Kenneth Ralph Roza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:28
CPC Classifications
E; E02; E02D; E02D5/00; E02D5/74; E02D5/80; E02D5/801; Y; Y10; Y10T; Y10T24/00; Y10T24/39; Y10T403/00; Y10T403/57; Y10T403/5741
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A screw anchor installable into the ground by the application of torsional forces so as to secure a guy wire or the like to the ground, said screw anchor comprising: a shaft having a first necked down groove near one end to form an installation hub to which are applied said torsional forces, at least one cutting blade attached to said shaft at a point spaced from said first necked down groove, an extension rod having a second necked down groove near a first end portion, and a coupler means attachable to said extension rod at a second end portion and to said shaft at said installation hub, said coupler means overlapping said first necked down groove when attached to said shaft.
Claim 2
Dependent Claim
122 words
A screw anchor installable into the ground by the application of torsional forces so as to secure a guy wire or the like to the ground, said screw anchor comprising: a shaft having a first necked down groove near one end to form an installation hub to which are applied said torsional forces, at least one cutting blade attached to said shaft at a point spaced from said first necked down groove, an extension rod having a second necked down groove near a first end portion, and a coupler means attachable to said extension rod at a second end portion and to said shaft at said installation hub, said coupler means overlapping said first necked down groove when attached to said shaft.
Claim 3
Dependent Claim
29 words
The screw anchor as set forth in claim 1 wherein the first necked down groove has a torsional ultimaTe strength less than the torsional yield strength of the shaft.
Claim 4
Dependent Claim
15 words
The screw anchor as set forth in claim 1 wherein said shaft is generally square-shaped.
Claim 5
Dependent Claim
21 words
The screw anchor as set forth in claim 1 wherein said first necked down groove has a generally round cross section.
Claim 6
Dependent Claim
18 words
The screw anchor as set forth in claim 1 wherein said cutting blade is welded to said shaft.
Claim 7
Dependent Claim
33 words
The screw anchor as set forth in claim 1 including first and second helical cutting blades attached to said shaft, said first cutting blade following the path cut by said second cutting blade.
References Cited (Backward Citations)
US505811A
Cited
US1193725A
Cited
US3016117A
Cited
US2085074A
Cited
US2864633A
Cited
US3439938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |