Adjustable seesaw

Amusement devices – Seesaw

Reexamination Certificate

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Details

C472S111000

Reexamination Certificate

active

11175087

ABSTRACT:
A seesaw includes a manually rotatable actuator for adjusting the balance of the seesaw to accommodate a weight differential between two riders. After adjusting the seesaw, the actuator automatically locks the adjustment mechanism in place. A rack-and-pinion assembly provides fine adjustment, and a protective cover avoids creating a pinching hazard.

REFERENCES:
patent: 670706 (1901-03-01), Ernst
patent: D58506 (1921-07-01), Schaller
patent: 1432746 (1922-10-01), Downey
patent: 1552841 (1925-09-01), Hector
patent: 2184200 (1939-12-01), Thomas
patent: 2431138 (1947-11-01), Ressinger
patent: D257685 (1980-12-01), Poulin
patent: 4262900 (1981-04-01), Vison
patent: D269538 (1983-06-01), Sinfield et al.
patent: 4448411 (1984-05-01), Parker
patent: 4804176 (1989-02-01), Goble
patent: 4877237 (1989-10-01), Goble
patent: 4896877 (1990-01-01), Moomaw et al.
patent: 5447474 (1995-09-01), Chang
patent: 5676601 (1997-10-01), Saunders
patent: 5951406 (1999-09-01), Steane
patent: 6149144 (2000-11-01), Ha

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