US4090337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible form for cementitious slurry
Assignee: MEDINA PLASTIC PRODUCTS Inc
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Filing: 1977-08-10
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Granted: 1978-05-23
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Expires: 1997-08-10
Abstract
Abstract Overlying first and second sheets of flexible fabric may be employed to make a form for slabs of concrete, or the like, when the sheets are adequately connected at spaced intervals. A novel connector for such purpose is disclosed herein and comprises a unique, staple-like configuration by which to permit separation of the sheets to a substantial but limited extent. Each connector has at least one shaft with a crown at one end and a point at the other end. A barb is provided in proximity to the pointed end of the shaft and presents a reentrant tip spaced laterally of the shaft and disposed in a direction opposite the point on the shaft. A bridge spans between the barb and shaft. The point permits facile penetration of both sheets with the crown limiting the extent to which the shaft can penetrate the first sheet. The reentrant tip on the barb permits facile retropenetration of the second sheet, and the bridge engages a sufficient portion of the second sheet to preclude withdrawal.
Inventors
- 👤 John M. Szekeres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:39
CPC Classifications
E; E02; E02B; E02B3/00; E02B3/04; E02B3/12; E02B3/122; E02B3/127; Y; Y10; Y10S; Y10S411/00; Y10S411/92; Y10T; Y10T428/00; Y10T428/24; Y10T428/24008; Y10T428/24017; Y10T428/24025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
A form for shaping concrete slabs comprising: first and second sheets of fabric material loosely woven from cord-like filaments; a plurality of individual connectors cooperatively interengaging said first and second sheets to permit separation of said sheets a substantial but limited amount; each said connector having at least one shaft with opposite first and second ends; a point at said first end of said shaft to pierce said first and second sheets; a crown at said second end of said shaft to engage said first sheet and limit the extent to which said shaft can penetrate said first sheet; a barb in proximity to said first end of said shaft, said barb presenting a re-entrant tip spaced laterally of said shaft and disposed in a direction opposite the point on said shaft to pierce said second sheet; and a bridge spanning between said shaft and said barb to engage said second sheet and limit the extent to which said barb can retropenetrate said second sheet.
Claim 2
Dependent Claim
165 words
A form for shaping concrete slabs comprising: first and second sheets of fabric material loosely woven from cord-like filaments; a plurality of individual connectors cooperatively interengaging said first and second sheets to permit separation of said sheets a substantial but limited amount; each said connector having at least one shaft with opposite first and second ends; a point at said first end of said shaft to pierce said first and second sheets; a crown at said second end of said shaft to engage said first sheet and limit the extent to which said shaft can penetrate said first sheet; a barb in proximity to said first end of said shaft, said barb presenting a re-entrant tip spaced laterally of said shaft and disposed in a direction opposite the point on said shaft to pierce said second sheet; and a bridge spanning between said shaft and said barb to engage said second sheet and limit the extent to which said barb can retropenetrate said second sheet.
Claim 3
Dependent Claim
96 words
A form, as set forth in claim 1, in which a head is presented at said first end of said shaft, said shaft delineating one edge of said head; a wedging surface intersecting said shaft at an acute angle; said point presented at the intersection of said wedging surface and said shaft; said bridge spanning between said shaft and the outermost extent of said wedging surface; a pedestal extending outwardly from the juncture of said wedging surface and said bridge in parallel, spaced relation with respect to said shaft and itself terminating in said re-entrant tip.
Claim 4
Dependent Claim
25 words
A form, as set forth in claim 2, in which each said connector employs a pair of substantially parallel shafts extending from a common crown.
Claim 5
Dependent Claim
44 words
A form, as set forth in claim 3, in which said bridges and pedestals associated with each said parallel shaft lie in a common plane and, in relation to the other shaft, on the opposite side of the shaft with which they are conjoined.
Claim 6
Dependent Claim
29 words
A form, as set forth in claim 4, in which a radial fillet is provided on the interior angle formed by the intersection of each shaft with said crown.
Claim 7
Dependent Claim
37 words
A form, as set forth in claim 5, in which one side of said shaft and crown have a semi-cylindrical cross section of one radius and the other side has a semi-cylindrical cross section of lesser radius.
Claim 8
Dependent Claim
14 words
A form, as set forth in claim 6, in which said connector is polypropylene.
References Cited (Backward Citations)
US3486341A
Cited
US3425227A
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US3468088A
Cited
US3555751A
Cited
US3570254A
Cited
US3757629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |