US3838930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-piece joint-forming device for hardenable, area-covering structural material
Assignee: KOLD-SEAL A CORP OF UT
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Filing: 1972-11-08
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Granted: 1974-10-01
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Expires: 1992-11-08
Abstract
Abstract An elongated device for forming surface joints in hardenable area-covering structural material such as freshly poured concrete comprising a bottom section and a top section that are temporarily coupled together when the device is forced into the initially soft material. The top section couples to the bottom section in such a manner as to transmit sufficient downward force on the bottom section to install it in the soft material. The bottom section has means for retaining itself within the material after it has cured or hardened so that the top section can be uncoupled and stripped from the bottom section.
Inventors
- 👤 V Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:08
CPC Classifications
E; E01; E01C; E01C23/00; E01C23/02; E01C23/021; E01C11/00; E01C11/02; E01C11/04; E01C11/10; E01C11/106
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
A two-piece elongated joint-forming structure for use with settable compositions used for slab-like installations comprising: a lower section of relatively flexible material with a main body portion having a vertically elongated cross-section and a tapered or rounded lower edge, a plurality of spaced apart members projecting outwardly from opposite sides of said body portion and a coupling member extending along the top edge of said body portion; an upper section comprising a cap member of generally harder material than said lower section, having a transverse top portion that is wider than the maximum cross-sectional width of said lower section and including leg portions extending downwardly from said top portion; said leg portions and coupling member having interlocking means at fixed locations thereon for releasably retaining them in assembled relation; and means on said lower section forming elongated bearing surfaces for the ends of said leg portions so as to transmit a driving force applied to said cap section to said lower section.
Claim 2
Dependent Claim
162 words
A two-piece elongated joint-forming structure for use with settable compositions used for slab-like installations comprising: a lower section of relatively flexible material with a main body portion having a vertically elongated cross-section and a tapered or rounded lower edge, a plurality of spaced apart members projecting outwardly from opposite sides of said body portion and a coupling member extending along the top edge of said body portion; an upper section comprising a cap member of generally harder material than said lower section, having a transverse top portion that is wider than the maximum cross-sectional width of said lower section and including leg portions extending downwardly from said top portion; said leg portions and coupling member having interlocking means at fixed locations thereon for releasably retaining them in assembled relation; and means on said lower section forming elongated bearing surfaces for the ends of said leg portions so as to transmit a driving force applied to said cap section to said lower section.
Claim 3
Dependent Claim
48 words
The joint forming structure as described in claim 1 wherein said coupling means further comprises an elongated bulbous projection having a substantially uniform cross-section and the interlocking means comprises a pair of grooves on one of said members and cooperating detent means on the other of said members.
Claim 4
Dependent Claim
18 words
The joint forming structure as described in claim 2 wherein said bulbous projection has a generally circular cross-section.
Claim 5
Dependent Claim
48 words
The joint-forming structure as described in claim 1 wherein said lower section is made from a rubber-like material having a Shore A hardness of around 70 to 85 and said upper cap member is made from relatively rigid material having a substantially greater hardness than said lower section.
Claim 6
Dependent Claim
47 words
The joint-forming structure as described in claim 1 wherein said coupling member on the upper end of said body portion has a generally circular cross-section forming grooves on its opposite sides and said leg portions of said upper section includes elongated projections that fit within said grooves.
Claim 7
Dependent Claim
70 words
The joint-forming structure as described in claim 1 wherein said means forming bearing surfaces comprise a pair of elongated shoulders near the upper end of said lower section that extend along opposite sides of and just below said coupling means, said leg portions of said cap member having lower edges that engage said bearing surfaces to thereby transmit a driving force applied to said cap section to said lower section.
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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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |