Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1983-08-08
1986-06-10
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
045945861
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 angle detector means for detecting an angle of rotation of the first driven roller, second angle detector means for detecting an angle of rotation of the second driven roller, and a sole biasing rotatable body positioned in confronting relation to the first and second driven rollers for resiliently biasing the rotatable ball against the first and second driven rollers. The biasing rotatable body is held in contact with the rotatable ball at a point which is joined to a center of rotation of the rotatable ball by a straight line passing centrally between the first and second driven rollers.
REFERENCES:
patent: 3010329 (1961-11-01), Rumrill et al.
patent: 3835464 (1974-09-01), Rider
patent: 4404865 (1983-09-01), Kim
Alps Electric Co. ,Ltd.
Curtis Marshall M.
Shoup Guy W.
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