US3636230A
Expired / Lapsed
US
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Didactic apparatus
Assignee: Philograph Publications Ltd
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Filing: 1970-07-08
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Granted: 1972-01-18
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Expires: 1990-07-08
Abstract
Abstract This invention is concerned with didactic structural apparatus and comprises a plurality of uniformly shaped and dimensioned cuboidal units and connecting means therefore whereby said units can be assembled to provide stable examples of areas and threedimensional solids which can be used in the teaching of arithmetic and geometry.
Inventors
- 👤 Charles Arthur Tacey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:47
CPC Classifications
G; G09; G09B; G09B23/00; G09B23/02; A; A63; A63H; A63H33/00; A63H33/04; A63H33/06; A63H33/08; A63H33/088; A63H33/10; A63H33/108
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
Didactic constructional apparatus, comprising a plurality of uniformly shaped and dimensioned units, each unit having on one face a spigot projection and in an opposite parallel face a corresponding socket whereby said units may be frictionally connected one to the other to form rods incorporating any required number of units; one or more reticular sheets formed with uniformly spaced interstices spaced apart in accordance with the dimensions of said units and corresponding in size and adapted to receive the spigots of said units whereby said units may be connected in side-by-side relationship; and a plurality of friction fit caps for fitting to the spigots of individual units: and the thickness of the or each reticular sheet and of each cap being less than the depth of a spigot.
Claim 2
Dependent Claim
128 words
Didactic constructional apparatus, comprising a plurality of uniformly shaped and dimensioned units, each unit having on one face a spigot projection and in an opposite parallel face a corresponding socket whereby said units may be frictionally connected one to the other to form rods incorporating any required number of units; one or more reticular sheets formed with uniformly spaced interstices spaced apart in accordance with the dimensions of said units and corresponding in size and adapted to receive the spigots of said units whereby said units may be connected in side-by-side relationship; and a plurality of friction fit caps for fitting to the spigots of individual units: and the thickness of the or each reticular sheet and of each cap being less than the depth of a spigot.
Claim 3
Dependent Claim
39 words
Constructional apparatus, as claimed in claim 1, wherein said units each are of hollow cuboidal shape one face whereof is open to form a square socket and the opposite face comprises a square spigot projection having a central aperture.
Claim 4
Dependent Claim
46 words
Constructional apparatus, as claimed in claim 2, wherein said reticular sheets are generally rectangular in shape being formed with rows of rectangular interstices dimensioned and arrAnged so as to receive the spigot projections of an array of units when arranged in a contiguous row or rows.
Claim 5
Dependent Claim
34 words
Constructional apparatus, as claimed in claim 2 wherein said friction fit caps are in the form of square open frames dimensioned so as to be friction fit upon the spigot projections of said units.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |