US4022420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formwork and connecting means apparatus for casting reinforced concrete
Assignee: Individual
•
Filing: 1975-11-06
•
Granted: 1977-05-10
•
Expires: 1995-11-06
Abstract
Abstract Formwork apparatus for casting concrete comprising a plurality of flattened tubular elongated elements each having one wall with an outer surface for contacting cast concrete and an opposite wall with a series of aligned apertures therein. The elongated elements are assembled in juxtaposed relation to constitute the form work by means of retainers which are disengageably interfittable with adjacent elongated elements. Each retainer includes two projecting flanges which penetrate into the interior of apertures of adjacent elongated elements and the flanges are provided with notches for engaging the walls of the elements at the ends of the apertures so as to lock the elements in place.
Inventors
- 👤 Anacleto Pace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:32
CPC Classifications
E; E04; E04G; E04G13/00; E04G13/02; E04G13/023; E04G13/025; E04G17/00; E04G17/04; E04G17/045; E04G9/00; E04G9/02; E04G9/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
Formwork for casting concrete comprising a plurality of flattened tubular elongated elements each having one wall with an outer surface for contacting cast concrete and an opposite wall with aperture means therein, and retainer means disengagably interfitted with at least two of said elongated elements holding the same in assembled juxtaposed relation, said aperture means in each said tubular elongated element being constituted by a series of longitudinal aligned apertures of trapezoidal shape, said retainer means including two flanges with notches therein, said flanges being secured together and engaged in the adjacent apertures of two juxtaposed elongated elements with said notches receiving the walls bounding the apertures.
Claim 2
Dependent Claim
107 words
Formwork for casting concrete comprising a plurality of flattened tubular elongated elements each having one wall with an outer surface for contacting cast concrete and an opposite wall with aperture means therein, and retainer means disengagably interfitted with at least two of said elongated elements holding the same in assembled juxtaposed relation, said aperture means in each said tubular elongated element being constituted by a series of longitudinal aligned apertures of trapezoidal shape, said retainer means including two flanges with notches therein, said flanges being secured together and engaged in the adjacent apertures of two juxtaposed elongated elements with said notches receiving the walls bounding the apertures.
Claim 3
Dependent Claim
27 words
Formwork apparatus as claimed in claim 1 wherein said flanges extend at right angles to one another for joining two tubular elements which are at right angles.
Claim 4
Dependent Claim
27 words
Formwork apparatus as claimed in claim 1 wherein said flanges extend parallel to one another to join two juxtaposed tubular elements which are parallel to one another.
Claim 5
Dependent Claim
17 words
Formwork apparatus as claimed in claim 1 comprising a manually engageable extension arm projecting from said flanges.
Claim 6
Dependent Claim
22 words
Formwork apparatus as claimed in claim 4 comprising an angle member secured on said extension arm for supporting and positioning planking thereon.
Claim 7
Dependent Claim
19 words
Formwork apparatus as claimed in claim 5 comprising pins mounted on said retainer means for receiving tie down means.
Claim 8
Dependent Claim
64 words
Formwork apparatus as claimed in claim 1 wherein said flanges are dimensioned relative to said trapezoidal apertures to be insertable into said apertures and be movable towards the narrow ends of said apertures to cause the walls at said narrow ends to pass in said notches the juxtaposed elongated elements being forced against one another as the flanges are moved towards said narrow ends.
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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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |