US3628764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete form
Assignee: Individual
•
Filing: 1968-10-31
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Granted: 1971-12-21
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Expires: 1988-10-31
Abstract
Abstract A concrete form used in forming a contraction joint between adjacent concrete slabs and a sheet member therefor. The concrete form comprises a plurality of aligned stakes and an elongated relatively rigid sheet member. Each of the stakes includes a ledge means. The sheet member has upper and lower longitudinally extending, generally planar portions and a longitudinally extending key deformation portion interposed between and connected to said planar portions. The sheet member has a plurality of longitudinally spaced strap means formed within one of the planar portions. Each of the strap means is disposed at least in partial encompassing engagement around a portion of a corresponding one of the stakes. The sheet member also includes a ledge engaging means for engaging the ledge means of the stake. The sheet member also has one of the planar portions, prior to installation upon the stakes, convergently disposed toward the other planar portion, taken in a direction preceding from the stakes to the key deformation portion. The strap means, ledge means, ledge-engaging means and planar portions cooperate to hold said member against said stakes to prevent vertical movement of the member relative to the stakes.
Inventors
- 👤 Duane C Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:12
CPC Classifications
E; E01; E01C; E01C11/00; E01C11/02; E01C11/04; E01C11/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
310 words
A concrete form of the type used in forming a key contraction joint between concrete slabs, said form comprising: a plurality of spaced apart, aligned stakes, Each of said stakes including a top and a ledge disposed beneath said top and projecting outwardly at a generally right angle to the longitudinal axis of its associated stake, said stakes adapted to be driven to a predetermined height so that the tops thereof are disposed along a first predetermined grade level; and, an elongated rigid sheet material member suitable for attachment to said stakes, said elongated rigid sheet material member including: upper and lower longitudinally extending planar portions and a longitudinally extending key deformation portion extending between and formed unitary with said upper and lower planar portions: urging means for urging said rigid elongated sheet material member into contacting engagement against the sides of said stakes, said urging means including said planar portions one of which is formed, prior to attachment to said stakes, to lie in a plane which intersects a plane containing the other planar portion to form an included angle of not more than 117* so that upon subsequent attachment of said elongated sheet material member to said stakes said upper and lower planar portions lie in a common plane in a manner that presses said elongated rigid sheet material against said stakes to prevent vertical movement thereof: a plurality of longitudinally spaced straps formed in one of said upper and lower planar portions, the spacing of said straps corresponding to the spacing between said stakes, each of said straps being disposed at least in partial encompassing engagement about a portion of a corresponding one of said stakes; and ledge engaging means for abuttingly engaging said ledges, said ledges and said ledge engaging means cooperating to support said elongated rigid sheet material member along a second predetermined grade level.
Claim 2
Dependent Claim
310 words
A concrete form of the type used in forming a key contraction joint between concrete slabs, said form comprising: a plurality of spaced apart, aligned stakes, Each of said stakes including a top and a ledge disposed beneath said top and projecting outwardly at a generally right angle to the longitudinal axis of its associated stake, said stakes adapted to be driven to a predetermined height so that the tops thereof are disposed along a first predetermined grade level; and, an elongated rigid sheet material member suitable for attachment to said stakes, said elongated rigid sheet material member including: upper and lower longitudinally extending planar portions and a longitudinally extending key deformation portion extending between and formed unitary with said upper and lower planar portions: urging means for urging said rigid elongated sheet material member into contacting engagement against the sides of said stakes, said urging means including said planar portions one of which is formed, prior to attachment to said stakes, to lie in a plane which intersects a plane containing the other planar portion to form an included angle of not more than 117* so that upon subsequent attachment of said elongated sheet material member to said stakes said upper and lower planar portions lie in a common plane in a manner that presses said elongated rigid sheet material against said stakes to prevent vertical movement thereof: a plurality of longitudinally spaced straps formed in one of said upper and lower planar portions, the spacing of said straps corresponding to the spacing between said stakes, each of said straps being disposed at least in partial encompassing engagement about a portion of a corresponding one of said stakes; and ledge engaging means for abuttingly engaging said ledges, said ledges and said ledge engaging means cooperating to support said elongated rigid sheet material member along a second predetermined grade level.
Claim 3
Dependent Claim
32 words
A concrete form of the type described in claim 1 in which each of said straps includes a lower surface and said ledge engaging means comprises the lower surfaces of said straps.
Claim 4
Dependent Claim
77 words
A concrete form of the type described in claim 2 in which a portion of each of said straps is disposed in contacting engagement with one side of a corresponding one of said stakes, said portion of said straps including a generally vertically disposed part that is convergently disposed, taken in a direction proceeding toward the upper longitudinally extending planar portion of said elongated rigid sheet material member, with respect to said upper longitudinally extending planar portion.
Claim 5
Dependent Claim
56 words
A concrete form of the type described in claim 1 in which said ledge of each of said stakes includes a tab portion transversely disposed with respect to said stake and said ledge engaging means comprises a plurality of longitudinally spaced apertures, each of said apertures having a corresponding one of said tab portions disposed therein.
Claim 6
Dependent Claim
58 words
A concrete form of the type described in claim 1 in which said ledge of each of said stakes includes a tab portion transversely disposed with respect to said stake and said ledge engaging means comprises a longitudinally extending recess formed in said elongated rigid sheet material member, each of said tab portions being disposed within said recess.
Claim 7
Dependent Claim
30 words
A concrete form of the type described in claim 1 in which said straps are formed in said upper planar portion of said upper and lower longitudinally extending planar portions.
Claim 8
Dependent Claim
83 words
A concrete form of the type described in claim 6 in which: said elongated rigid sheet material member also includes a plurality of longitudinally spaced lower straps formed in said lower planar portion and aligned with the straps formed in said upper planar portion, each of said lower straps having a lower surface; said ledge comprises a tab portion transversely formed on said stake; and, said ledge engaging means comprising the lower surfaces of the lower straps formed in said lower planar portion.
Claim 9
Dependent Claim
40 words
A concrete form of the type described in claim 1 in which said upper planar portion includes a folded oveR portion extending downwardly from the upper edge thereof and disposed against at least a part of said upper planar portion.
Claim 10
Dependent Claim
47 words
A concrete form of the type described in claim 8 in which said sheet member includes means formed thereon for increasing the frictional force resisting movement of the sheet member relative to said stakes, said means including roughened surface portions disposed in contacting engagement with said stakes.
Claim 11
Dependent Claim
68 words
A concrete form of the type described in claim 6 in which: said elongated rigid sheet material member also includes a plurality of longitudinally spaced lower straps formed in said lower planar portion and aligned with the straps in said upper planar portion; said ledge comprises a tab portion transversely formed on said stakes; and, said ledge engaging means comprises the lower surface of said lower planar portion.
Claim 12
Dependent Claim
40 words
A concrete form of the type described in claim 10 in which said upper planar portion includes a folded over portion extending downwardly from the upper edge thereof and disposed against at least a part of said upper planar portion.
Claim 13
Dependent Claim
47 words
A concrete form of the type described in claim 11 in which said sheet member includes means formed thereon for increasing the frictional force resisting movement of the sheet member relative to said stakes, said means including roughened surface portions disposed in contacting engagement with said stakes.
References Cited (Backward Citations)
US1298018A
Cited
US3497172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |