US3734670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable mold for erecting concrete or plastic shelters
Assignee: Individual
•
Filing: 1970-03-03
•
Granted: 1973-05-22
•
Expires: 1990-03-03
Abstract
Abstract The invention relates to a portable mold for erecting a poured concrete or plastic structure for use as a shelter or storage building. An inside inflatable form is used to develop an internal countour and supply a compressive force against a poured cement mix sandwiched between the inflatable form and an outside rigid form of determined contour, such as a quonset hut. The inflatable inner form can be removed after exhausting the compressed air from its confined area and may be reused.
Inventors
- 👤 C Stickler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:09
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/28; B28B7/30; B28B7/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A form for erecting building shells or enclosures, comprising an outer rigid curved form sub-divided into two curved complementary halves terminating in upwardly extending flanges which are in confronting relationship, said halves defining the outer wall, a base, means for detachably fastening said flanges together, means for detachably fastening the bottom end portions of said halves to said base, a flexible inner form spaced inwardly from and surrounded by said outer form, means for anchoring the ends of said flexible inner form to said base, means for allowing introduction of cementious mix between said inner and outer forms, a cylindrical tube of inflatable material substantially surrounded by said inner form and in contact with substantially the top half thereof and means for introducing air under pressure inside said cylindrical tube so that it will inflate and compress said mix between said inner and outer forms.
Claim 2
Dependent Claim
145 words
A form for erecting building shells or enclosures, comprising an outer rigid curved form sub-divided into two curved complementary halves terminating in upwardly extending flanges which are in confronting relationship, said halves defining the outer wall, a base, means for detachably fastening said flanges together, means for detachably fastening the bottom end portions of said halves to said base, a flexible inner form spaced inwardly from and surrounded by said outer form, means for anchoring the ends of said flexible inner form to said base, means for allowing introduction of cementious mix between said inner and outer forms, a cylindrical tube of inflatable material substantially surrounded by said inner form and in contact with substantially the top half thereof and means for introducing air under pressure inside said cylindrical tube so that it will inflate and compress said mix between said inner and outer forms.
Claim 3
Dependent Claim
58 words
A form as recited in claim 1 wherein there is a space of substantially triangular cross-section between the bottom half of said cylindrical tube and each end portion of said inner form, a shaping form substantially filling each of said spaces, whereby said shaping forms will press outwardly against said inner form upon inflation of said cylindrical tube.
Claim 4
Dependent Claim
31 words
A form as recited in claim 1 wherein said flanges are disposed in spaced confronting relationship when fastened together, whereby said cementious mix will overflow therebetween to define a medial rib.
Claim 5
Dependent Claim
78 words
A form as recited in claim 1 wherein said cylindrical tube is of elastic rubber material, wherein said base is in the form of a footer, and wherein said means for detachably fastening the bottom end portion of said halves to said base and said means for anchoring the ends of said flexible inner form to said base comprise a plurality of U-shaped elements embedded in said base and having upstanding legs which serve as the respective means.
Claim 6
Dependent Claim
13 words
A form as recited in claim 2 wherein said shaping form is inflatable.
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |