US3687411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete form locked by universal key
Assignee: Individual
•
Filing: 1970-10-05
•
Granted: 1972-08-29
•
Expires: 1990-10-05
Abstract
Abstract A readily assembled and readily stripped, reusable concrete form is constructed from a plurality of similar flat-faced panels having spaced, co-planer, open-ended edge-oriented slots in the margins of the other or opposite faces thereof; and a plurality of elongated L-shaped keys which are employed both to interlock the panels on each side of the form, and to interlock the form from side to side. The panels are arranged in two spaced, parallel, oppositely disposed, edge to edge, co-planer flat-faced arrays of the same; and are interlocked with one another in each array by placing a first set of the keys in the plane of the slots opposite points relatively within the margins of the panels, and slidably engaging the keys in the adjacent slots of adjacent panels. The arrays are interlocked with one another by placing a second set of the keys in the plane of the slots opposite points relatively without the margins of the panels, slidably engaging the latter keys in the slots of the panels along corresponding edges of the arrays, and interconnecting the latter keys with one another transversely of the space between the arrays.
Inventors
- 👤 Stanley J Frazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:29
CPC Classifications
E; E04; E04G; E04G17/00; E04G17/02; E04G11/00; E04G11/06; E04G11/08; E04G11/087; E04G11/12; E04G9/00; E04G9/02; E04G9/05
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
133 words
In a form for molding concrete or the like, a plurality of similar flat-faced panels having spaced, co-planer, open-ended, edge-oriented slots in the margins of the other faces thereof, arranged in two spaced, parallel, oppositely disposed, edge to edge, co-planar flat-faced arrays of the same; a first set of elongated L-shaped keys slidably engaged in the adjacent slots of adjacent panels in each array, to interlock the panels with one another in each array; a second set of keys having the same shape as the first set of keys, slidably engaged in the slots of the panels along corresponding edges of the arrays, from points of entry in the slots adjacent the edges of the respective panels; and means interconnecting the latter keys with one another transversely of the space between the arrays.
Claim 2
Dependent Claim
133 words
In a form for molding concrete or the like, a plurality of similar flat-faced panels having spaced, co-planer, open-ended, edge-oriented slots in the margins of the other faces thereof, arranged in two spaced, parallel, oppositely disposed, edge to edge, co-planar flat-faced arrays of the same; a first set of elongated L-shaped keys slidably engaged in the adjacent slots of adjacent panels in each array, to interlock the panels with one another in each array; a second set of keys having the same shape as the first set of keys, slidably engaged in the slots of the panels along corresponding edges of the arrays, from points of entry in the slots adjacent the edges of the respective panels; and means interconnecting the latter keys with one another transversely of the space between the arrays.
Claim 3
Dependent Claim
22 words
The form according to claim 1 wherein at least a portion of the keys are each individually slidably engaged in a slot.
Claim 4
Dependent Claim
33 words
The form according to claim 1 wherein at least a portion of the keys are slidably interengaged in pairs in an individual slot from points of entry adjacent the opposite end openings thereof.
Claim 5
Dependent Claim
47 words
The form according to claim 1 wherein the second set of keys project relatively away from one another outside the space between the arrays, and are fastened to a third member such as the footing structure of a wall form, which bridges the space between the arrays.
Claim 6
Dependent Claim
36 words
The form according to claim 1 wherein tHe second set of keys project relatively toward one another in the space between the arrays, and are fastened together in overlapping relationship with one another in the space.
Claim 7
Dependent Claim
70 words
The form according to claim 1 further comprising a third set of keys having the same shape as the first set of keys, slidably engaged in slots in the adjacent margins of a pair of spaced parallel similar panels having a dissimilar panel abutted therewith so as to close the space therebetween, and projecting relatively outwardly from the adjacent edges of the similar panels in abutment with the dissimilar panel.
Claim 8
Dependent Claim
48 words
The form according to claim 6 wherein the similar panels are disposed in the same array, with the dissimilar panel interposed edge to edge therebetween in the plane of the array, and the third set of keys are in abutment with the adjacent face of the dissimilar panel.
Claim 9
Dependent Claim
56 words
The form according to claim 6 wherein the similar panels are opposed to one another in the arrays, with the dissimilar panel extending crosswise of the space between the arrays and abutted with corresponding edges of the similar panels, and the third set of keys are in abutment with the adjacent edges of the dissimilar panel.
Claim 10
Dependent Claim
18 words
The form according to claim 1 wherein the slots are spaced inwardly from the edges of the panels.
Claim 11
Dependent Claim
32 words
The form according to claim 1 wherein the panels have U-shaped straps outstanding on the margins of the aforesaid other faces thereof, the channels of which form the slots in the margins.
Claim 12
Dependent Claim
28 words
The form according to claim 10 wherein the keys take the form of flat elongated bars having flat right angular flanges of equal thickness on one end thereof.
Claim 13
Dependent Claim
27 words
The form according to claim 11 wherein the straps are spaced relatively inwardly from the edges of the panels by at least the thickness of the keys.
Claim 14
Dependent Claim
29 words
The form according to claim 11 wherein the keys are apertured, and the means for interconnecting the second set of keys includes fastener means passed through the apertures therein.
Claim 15
Dependent Claim
45 words
The form according to claim 11 wherein the bars of the first set of keys are slidably interengaged in pairs in an individual slot from points of entry adjacent the opposite end openings thereof, and the flanges of each pair are interconnected by fastener means.
Claim 16
Dependent Claim
89 words
The form according to claim 10 wherein the panels each have a raised marginal frame on the aforesaid other face thereof; and a co-planar bearing surface for shoring is raised on the face within the frame, at a point coincident with a line which is disposed on a parallel to one axis of the panel and extends through the space between a pair of straps along one edge of the panel, so that the shoring can make three point contact with the face of the panel between the straps.
Claim 17
Dependent Claim
27 words
The form according to claim 15 wherein the panel has an aperture therein which opens into the bearing surface to pass a cross-tie therethrough adjacent the shoring.
Claim 18
Dependent Claim
35 words
The form according to claim 16 wherein the panel is constructed from a water permeable core material, and the aperture has a water impermeable sleeve inserted therethrough flush with the flat face of the panel.
Claim 19
Dependent Claim
31 words
The form according to claim 17 wherein the core material has a water impermeable coating on both the flat face and the aforesaid other face thereof, to seal it against moisture.
Claim 20
Dependent Claim
26 words
The form according to claim 18 wherein the coating on the flat face of the panel also acts as a parting film with respect to concrete.
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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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |