Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1984-03-08
1986-09-16
Curtis, Marshall M.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
74471XY, G09G 100
Patent
active
046125396
ABSTRACT:
An X-Y input device comprises a rotatable ball, a first driven roller held in contact with the rotatable ball and rotatable in response to rotation of the rotatable ball, a second driven roller held in contact with the rotatable ball and rotatable in response to rotation of the rotatable ball, the second driven roller having an axis of rotation extending substantially perpendicularly to that of the first driven roller, first rotation detector means for detecting an amount of rotation of the first driven roller, second rotation detector means for detecting an amount of rotation of the second driven roller, and frictional force imposing means for resiliently urging the ball against the first and second driven rollers to impose frictional forces between the ball and the driven rollers, the frictional force imposing means comprising a contact roller held in rolling contact with the ball and having a shaft, a slidable roller support having bearings supporting opposite ends of the shaft and a spring bearing, a fixed member having a spring bearing opposite to the spring bearing of the slidable roller support, and a coil spring interposed under compression between the spring bearing of the slidable roller support and the spring bearing of the fixed member for normally urging the contact roller against the ball.
REFERENCES:
patent: 3010329 (1961-11-01), Rumrill et al.
patent: 3395589 (1968-08-01), Gersten
patent: 4404865 (1983-09-01), Kim
Hosogoe Junichi
Ida Yuichi
Suzuki Motoyuki
Alps Electric Co. ,Ltd.
Curtis Marshall M.
Shoup Guy W.
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