Drag/damper device
US5366193A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 13, 1993 |
| Grant date | Nov 22, 1994 |
| Priority date | — |
| Expiry date | Jan 13, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16M2200/044
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.