Drag/damper device
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United States of America Patent
Stats
-
Nov 22, 1994
Grant Date -
N/A
app pub date -
Jan 13, 1993
filing date -
Aug 21, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pan and tilt head for a TV or video camera mounting (10) comprises two drag/damper devices, one for controlling the pan movement and the other for controlling the tilt movement. Each device may comprise a fixed central shaft (18), a first set of spaced plates (22) secured to the shaft, a second set (24) secured to a rotatable housing (20), and a third set (26) interleaved between the first and second sets. When the plates are immersed in a viscous fluid and one member is moved, the characteristics are such that the forque increases linearly with speed from zero up to a given speed, and then remains substantially constant above the speed.
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