Card – picture – or sign exhibiting – Changing exhibitor – Rotatable carrier for display item
Patent
1983-05-11
1987-01-20
Yu, Mickey
Card, picture, or sign exhibiting
Changing exhibitor
Rotatable carrier for display item
40421, 446248, 446236, 74141, 74 64, 74 15, 185 31, G09F 1104
Patent
active
046371524
ABSTRACT:
A rotary drive mechanism for toys, kinetic sculptures, and the like, employs a pawl and ratchet mechanism to transmit driving torque between a driving wheel and a driven inertia wheel. The driving wheel may itself be driven by means of a drive string that may frictionally engage a circular drive surface to permit the driving wheel to be rotated independently with limited slippage between the string and the drive surface. A fixed and uniform amount of energy can be imparted to the driving wheel and the driven wheel through a spring that is connected to the drive string and preloaded by a predetermined amount. A second inertia wheel can be mounted coaxially of the one inertia wheel and both wheels may operate with random motion through an interference coupling. The pawl and ratchet mechanism in one embodiment forms an escapement to provide intermittent drive to the wheels. The inertia wheel is rotationally unbalanced with a weight offset from the axis of rotation.
REFERENCES:
patent: 435279 (1890-08-01), Canedy
patent: 935406 (1909-09-01), Riddle
patent: 4042242 (1977-08-01), Nicholls et al.
patent: 4341035 (1982-07-01), Jaworski et al.
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