Patent US3197003A successfully refreshed from Google Patents.
Patent US3784313A successfully refreshed from Google Patents.
US3784313A
Expired / Lapsed
US
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Means for attaching a key-joint forming strip to a support stake
Assignee: Burke Concrete Accessories
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Filing: 1972-04-13
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Granted: 1974-01-08
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Expires: 1992-04-13
Abstract
Abstract A concrete slab key joint forming strip has an upper edge construction that includes a folded-over portion which extends downwardly in spaced, parallel relationship with the upper part of the forming strip and terminates in a lip which extends inwardly toward the upper portion of the forming strip. A stake for supporting the forming strip has outwardly and downwardly sloping protrusions provided adjacent the upper end thereof whereby the upper end of the stake will snap into engagement with the forming strip between the upper and folded-over portions of the strip and the strip will be retained on the stake by the lip on the folded-over portion.
Inventors
- 👤 T Collier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:59
CPC Classifications
E; E01; E01C; E01C11/00; E01C11/02; E01C11/04; E01C11/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
224 words
In combination with a concrete slab forming strip having an upper section of generally inverted U-shaped cross-section comprising a base portion having a downwardly extending hook portion extending from one side thereof and terminating in a distal edge and a stake adapted to be inserted into said section to effect the support of said strip, said stake having an upper end adapted to abut against the base portion of said upper section upon insertion of the stake thereinto, an improved construction for securing the strip against separation from the stake, said construction comprising: a. a protrusion on the stake positioned to be confined within the upper section of the strip upon insertion of the stake into said section, said protrusion terminating in an abrupt edge disposed to be substantially opposite the distal edge of said hook portion upon insertion of the stake into the upper section of the strip with the upper end of the stake abutting the base portion of said section; and, b. a lip on the upper section of the strip comprising a flange extending from the distal edge of the hook portion for abutting engagement with the abrupt edge of the protrusion upon insertion of the stake into the upper section of the strip with the upper end of the stake in abutting engagement with the base of said section.
Claim 2
Dependent Claim
224 words
In combination with a concrete slab forming strip having an upper section of generally inverted U-shaped cross-section comprising a base portion having a downwardly extending hook portion extending from one side thereof and terminating in a distal edge and a stake adapted to be inserted into said section to effect the support of said strip, said stake having an upper end adapted to abut against the base portion of said upper section upon insertion of the stake thereinto, an improved construction for securing the strip against separation from the stake, said construction comprising: a. a protrusion on the stake positioned to be confined within the upper section of the strip upon insertion of the stake into said section, said protrusion terminating in an abrupt edge disposed to be substantially opposite the distal edge of said hook portion upon insertion of the stake into the upper section of the strip with the upper end of the stake abutting the base portion of said section; and, b. a lip on the upper section of the strip comprising a flange extending from the distal edge of the hook portion for abutting engagement with the abrupt edge of the protrusion upon insertion of the stake into the upper section of the strip with the upper end of the stake in abutting engagement with the base of said section.
Claim 3
Dependent Claim
61 words
In a combination according to claim 1, the improvement wherein the protrusion and lip are preformed prior to insertion of the stake into the upper section of the strip and wherein the upper section of the strip is resiliently deflectable to permit the lip to snap over the protrusion upon insertion of the stake into the upper section of the strip.
Claim 4
Dependent Claim
23 words
The combination of claim 1 wherein the protrusion comprises tab-like segments of the stake which extend outwardly and downwardly from the support stake.
Claim 5
Dependent Claim
35 words
The combination of claim 3 wherein said segments include a ramp surface extending outwardly and downwardly with respect to the support stake, and a lower edge surface at the lower termination of the ramp surface.
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |