US4060218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatically controlled rigid core-former
Assignee: Individual
•
Filing: 1976-06-14
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Granted: 1977-11-29
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Expires: 1996-06-14
Abstract
Abstract A form assembly which may be used to provide a core portion in a concrete or other cast structure. A pair of former elements having interfitting hooks and flanges which are normally urged apart by a resilient sleeve which fits over the former elements. The sleeve biases the former elements to a collapsed position in which they may be inserted and removed. An inflatable tube is interposed between the former elements and may be inflated to move the elements to an expanded position wherein forming surfaces of the elements cooperate to provide a core about which concrete or the like may be poured.
Inventors
- 👤 Kandiah Tharma Nayagam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:03
CPC Classifications
E; E04; E04G; E04G15/00; E04G15/06; E04G15/063; E04G15/066; B; B28; B28B; B28B7/00; B28B7/28; B28B7/30; B28B7/32; E04G11/00; E04G11/04; E04G11/045
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
A form assembly for use in forming a core portion of a structure, comprising: a pair of former elements each having an exterior forming surface, said former elements being adapted to fit together and being relatively movable between a first collapsed position and a second expanded position wherein said former elements interfit with one another with their forming surfaces cooperating to present a surface for shaping the core; a resilient sleeve member closely fitting on said former elements in substantially surrounding relation thereto; a hook member on one of said former elements; a hook engaging member on the other of said former elements adapted to engagingly interlock with said hook member in the expanded position and separated from said hook member in the collapsed position; and means located between said former elements for effecting relative movement thereof from said collapsed to said expanded position.
Claim 2
Dependent Claim
144 words
A form assembly for use in forming a core portion of a structure, comprising: a pair of former elements each having an exterior forming surface, said former elements being adapted to fit together and being relatively movable between a first collapsed position and a second expanded position wherein said former elements interfit with one another with their forming surfaces cooperating to present a surface for shaping the core; a resilient sleeve member closely fitting on said former elements in substantially surrounding relation thereto; a hook member on one of said former elements; a hook engaging member on the other of said former elements adapted to engagingly interlock with said hook member in the expanded position and separated from said hook member in the collapsed position; and means located between said former elements for effecting relative movement thereof from said collapsed to said expanded position.
Claim 3
Dependent Claim
15 words
The invention set forth in claim 1, wherein the last named means comprises pneumatic means.
Claim 4
Dependent Claim
36 words
The invention set forth in claim 2, wherein said pneumatic means comprises an inflatable tube interposed between said former elements, said tube being inflatable to move said former elements from the collapsed to the expanded position.
Claim 5
Dependent Claim
169 words
A form assembly for use in forming a core portion of a structure, comprising: a pair of former elements each having a smooth, continuous forming surface and terminal edge portions extending longitudinally of the element, said former elements being adapted to fit together and being relatively movable between a first collapsed position and a second expanded position wherein said former elements interfit with one another with their former surfaces cooperating to present a substantially continuously extending surface for shaping the core; a resilient sleeve member closely fitting on said former elements in substantially surrounding relation thereto; an inflatable tube member located between opposed edge portions of the respective former elements in substantially continuous extension longitudinally of the elements; means operatively associated with said tube member for inflating said tube member to move said former elements from the collapsed position to the expanded position; and interlocking means on the edge portions of said former elements operable to engagingly interlock opposed edge portions with one another when in the expanded position.
Claim 6
Dependent Claim
169 words
A form assembly for use in forming a core portion of a structure, comprising: a pair of former elements each having a smooth, continuous forming surface and terminal edge portions extending longitudinally of the element, said former elements being adapted to fit together and being relatively movable between a first collapsed position and a second expanded position wherein said former elements interfit with one another with their former surfaces cooperating to present a substantially continuously extending surface for shaping the core; a resilient sleeve member closely fitting on said former elements in substantially surrounding relation thereto; an inflatable tube member located between opposed edge portions of the respective former elements in substantially continuous extension longitudinally of the elements; means operatively associated with said tube member for inflating said tube member to move said former elements from the collapsed position to the expanded position; and interlocking means on the edge portions of said former elements operable to engagingly interlock opposed edge portions with one another when in the expanded position.
Claim 7
Dependent Claim
57 words
The invention set forth in claim 4, wherein said interlocking means comprises hook members on the edge portions of one former element and hook engaging members on the edge portions of the other former element, said hook and hook engaging members engaging one another in the expanded position and separated from one another in the collapsed position.
References Cited (Backward Citations)
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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) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |