US3792942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming continuous lengths of hollow concrete monolithic structures
Assignee: Individual
•
Filing: 1972-11-10
•
Granted: 1974-02-19
•
Expires: 1992-11-10
Abstract
Abstract A self-propelled and self-aligning form disposed for the casting or forming of continuous length of hollow monolithic concrete structures such as drainage pipe, tunnels or open trenches.
Inventors
- 👤 L Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:09
CPC Classifications
F; F16; F16L; F16L1/00; F16L1/024; F16L1/028; F16L1/038
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
246 words
An apparatus for forming a continuous monolithic hollow object in a pre-dug opening in the earth comprising: an expandable thrust collar, a pair of guide rails fixedly mounted on said collar at diametrically opposed position points within the inner periphery of said collar and extending laterally therefrom in a common direction within the pre-dug opening, a molding collar mounted for slidable movement along said rails, means mounted between said thrust collar and said molding collar for moving said thrust collar and said molding collar relative to each other, a shield coaxially arranged around and spaced from said molding collar in the pre-dug opening and extending axially outwardly therefrom, an alignment means axially arranged within and in fixed contact with the inside periphery of said shield spaced from said shield and having a screed plate extending outwardly therefrom toward said shield, said screed plate being axially movable within said shield relative to said molding collar, said molding collar being spaced from said shield the distance of the thickness of the object being formed, and means for expanding said thrust collar into engagement with the inside periphery of the object being formed to anchor said thrust collar in position when pliable mud is forced into the space being said molding collar and the inside wall of said shield, said screed plate being movable into contact with the set pliable mud at the end of the object being formed to prevent tearing of concrete while form is being advanced.
Claim 2
Independent Claim
246 words
An apparatus for forming a continuous monolithic hollow object in a pre-dug opening in the earth comprising: an expandable thrust collar, a pair of guide rails fixedly mounted on said collar at diametrically opposed position points within the inner periphery of said collar and extending laterally therefrom in a common direction within the pre-dug opening, a molding collar mounted for slidable movement along said rails, means mounted between said thrust collar and said molding collar for moving said thrust collar and said molding collar relative to each other, a shield coaxially arranged around and spaced from said molding collar in the pre-dug opening and extending axially outwardly therefrom, an alignment means axially arranged within and in fixed contact with the inside periphery of said shield spaced from said shield and having a screed plate extending outwardly therefrom toward said shield, said screed plate being axially movable within said shield relative to said molding collar, said molding collar being spaced from said shield the distance of the thickness of the object being formed, and means for expanding said thrust collar into engagement with the inside periphery of the object being formed to anchor said thrust collar in position when pliable mud is forced into the space being said molding collar and the inside wall of said shield, said screed plate being movable into contact with the set pliable mud at the end of the object being formed to prevent tearing of concrete while form is being advanced.
Claim 3
Dependent Claim
35 words
The apparatus set forth in claim 1 wherein: said means mounted between said thrust collar and said molding collar comprises first and second fluid operated cylinders, each mounted adjacent a different one of said rails.
Claim 4
Dependent Claim
29 words
The apparatus set forth in claim 2 wHerein: a third fluid operated cylinder is mounted between said screed plate and said alignment means for axially moving said screed plate.
Claim 5
Dependent Claim
58 words
The apparatus set forth in claim 3 wherein: said alignment means comprises a hexagonal ring axially mounted with said molding collar and a number of fluid actuated feet equally spaced around the periphery of said ring for moving outwardly thereof to engage the inside periphery of said shield to lock said ring into firm engagement with said shield.
Claim 6
Dependent Claim
15 words
The apparatus set forth in claim 1 wherein the shield is of a cylindrical configuration.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |