US3855748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Playground assembly set
Assignee: Individual
•
Filing: 1972-12-15
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Granted: 1974-12-24
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Expires: 1992-12-15
Abstract
Abstract Playground assembly elements consisting of a plurality of planar elements of at least two different sizes. One element is substantially larger in area than the other element, and both elements have notches in strategic locations so that the two elements may be easily combined in numerous permutations, and just as easily disassembled, without the use of fasteners or other connecting elements. The elements are of a size and construction such that they are capable of safely supporting the weight of children playing in or on the constructed assemblies.
Inventors
- 👤 J Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:09
CPC Classifications
A; A63; A63H; A63H33/00; A63H33/04; A63H33/10; A63H33/105; A63B; A63B9/00; A63B2208/00; A63B2208/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
165 words
A building set, the elements of which can be connected with one another to form modular structures, comprising: a plurality of thin-edged, multilateral, plate-like building elements having defined therein a plurality of first slots of predetermined uniform depth, including at least two slots opening onto each edge of said building element, each of said two slots being spaced an equal distance from the nearest corner of said building element; and, a plurality of thin-edged, plate-like connecting elements substantially smaller in surface area than said building elements and having defined therein a plurality of second slots of predetermined uniform depth, said connecting elements joining with said building elements in slidable interconnection between said first and second slots, wherein the distance between adjacent first slots in a given edge of said building elements is equal to twice said equal distance plus the difference between the straight-line distance separating opposing second slots in said connecting element and a distance equal to twice the depth of said first slots.
Claim 2
Dependent Claim
165 words
A building set, the elements of which can be connected with one another to form modular structures, comprising: a plurality of thin-edged, multilateral, plate-like building elements having defined therein a plurality of first slots of predetermined uniform depth, including at least two slots opening onto each edge of said building element, each of said two slots being spaced an equal distance from the nearest corner of said building element; and, a plurality of thin-edged, plate-like connecting elements substantially smaller in surface area than said building elements and having defined therein a plurality of second slots of predetermined uniform depth, said connecting elements joining with said building elements in slidable interconnection between said first and second slots, wherein the distance between adjacent first slots in a given edge of said building elements is equal to twice said equal distance plus the difference between the straight-line distance separating opposing second slots in said connecting element and a distance equal to twice the depth of said first slots.
Claim 3
Dependent Claim
45 words
An apparatus in accordance with claim 1, wherein each edge of said building elements is substantially 2 feet in length, and wherein each of said plurality of building elements and connecting elements are substantially one-half inch thick and are made of a substantially nonresilient material.
Claim 4
Dependent Claim
20 words
An apparatus in accordance with claim 2, wherein said connecting element includes at least two pairs of opposing second slots.
Claim 5
Dependent Claim
25 words
An apparatus in accordance with claim 3, wherein said connecting element is a square, and each of said second slots open on a corner thereof.
Claim 6
Dependent Claim
25 words
An apparatus in accordance with claim 4, wherein each of said second slots is relieved where it opens onto a corner of said connecting element.
Claim 7
Dependent Claim
45 words
An apparatus in accordance with claim 5, wherein each relieved edge of said connecting element between a second slot and the peripheral edge is substantially straight, and forms a right angle with the reSpective peripheral edge and an obtuse angle with the respective second slot.
References Cited (Backward Citations)
FR1243060A
Cited
US3177611A
Cited
US3477188A
Cited
US3537706A
Cited
US3564758A
Cited
US3687500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |