US3750308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational demonstration model
Assignee: Individual
•
Filing: 1971-02-12
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Granted: 1973-08-07
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Expires: 1991-02-12
Abstract
Abstract An educational demonstration model for demonstrating the principles of balance, and of the center of gravity, and the principles of the movement of the sun, the revolution of the earth around the sun, and the revolution of the moon around the earth. The device comprises a base with a substantially vertical member secured to and extending upwardly from the base, and with a spherical member balanced on the top of the vertical member and simulating the sun, and with members simulating the earth and the moon connected to the sun and mounted on rods so that they will revolve jointly around the sun and so that the moon will revolve around the earth. The large sphere is balanced on a point, and the smaller spheres representing the earth and the moon are connected to the sun by a rod so that they are offset from the center of the balance a distance so that the device may be balanced by means of a weight on the interconnecting rod and the center of gravity principle may be demonstrated. The smallest sphere representing the moon is mounted so that it may be made to revolve around the earth.
Inventors
- 👤 D Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:34
CPC Classifications
G; G09; G09B; G09B27/00; G09B27/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
342 words
An educational demonstration model for demonstrating both (1) the principles of balance and center of gravity; (2) the motion of the sun in the heavens, the revolution of the earth about the sun, and the revolution of the moon about the earth, comprising: a base on which the whole apparatus rests; an approximately vertical supporting rod secured to and extending upwardly from said base and having a substantially flat surface at its upper end; a rod having a pointed end which rests on the flat surface and is rotatably balanced theReon; a relatively large sphere representing the sun secured to the rod at the end thereof opposite to the pointed end; a bent rod secured to said large sphere at a point removed from the connection to the pointed rod, said bent rod consisting of a substantially vertical portion extending downwardly from said sphere, a substantially horizontal portion extending toward and beyond said vertical supporting rod and an upwardly extending portion; a sleeve into which said upwardly extending portion of the bent rod is inserted; a third rod inserted in the end of said sleeve opposite to the upwardly extending portion of the bent rod and extending upward from said sleeve; a smaller sphere representing the earth secured to the upper end of said third supporting rod; a collar mounted on said third supporting rod to rotate thereon; a fourth rod secured to said collar to rotate about said third rod; and a still smaller sphere representing the moon mounted on the end of the fourth rod opposite to the collar; whereby the large sun sphere may move around said supporting rod, the smaller earth sphere may move around said large sphere, and the smallest moon sphere may move around said smaller earth sphere; and a counter weight comprising a slidable cylindrical member formed with a longitudinal axial bore, the horizontal portion of the bent rod passing through said bore, the weight being movably and slidably mounted on the horizontal portion of the bent rod to maintain the apparatus in proper relationship.
Claim 2
Dependent Claim
342 words
An educational demonstration model for demonstrating both (1) the principles of balance and center of gravity; (2) the motion of the sun in the heavens, the revolution of the earth about the sun, and the revolution of the moon about the earth, comprising: a base on which the whole apparatus rests; an approximately vertical supporting rod secured to and extending upwardly from said base and having a substantially flat surface at its upper end; a rod having a pointed end which rests on the flat surface and is rotatably balanced theReon; a relatively large sphere representing the sun secured to the rod at the end thereof opposite to the pointed end; a bent rod secured to said large sphere at a point removed from the connection to the pointed rod, said bent rod consisting of a substantially vertical portion extending downwardly from said sphere, a substantially horizontal portion extending toward and beyond said vertical supporting rod and an upwardly extending portion; a sleeve into which said upwardly extending portion of the bent rod is inserted; a third rod inserted in the end of said sleeve opposite to the upwardly extending portion of the bent rod and extending upward from said sleeve; a smaller sphere representing the earth secured to the upper end of said third supporting rod; a collar mounted on said third supporting rod to rotate thereon; a fourth rod secured to said collar to rotate about said third rod; and a still smaller sphere representing the moon mounted on the end of the fourth rod opposite to the collar; whereby the large sun sphere may move around said supporting rod, the smaller earth sphere may move around said large sphere, and the smallest moon sphere may move around said smaller earth sphere; and a counter weight comprising a slidable cylindrical member formed with a longitudinal axial bore, the horizontal portion of the bent rod passing through said bore, the weight being movably and slidably mounted on the horizontal portion of the bent rod to maintain the apparatus in proper relationship.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |