초록 ▼

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 se

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.

대표청구항 ▼

A rotary damper comprising two torque resisting rotary damping devices coupled together in series, one of said rotary damping devices having an input, an output and a viscous fluid coupling to provide a resistance torque to relative rotation between the input and output which is zero when the relati

A rotary damper comprising two torque resisting rotary damping devices coupled together in series, one of said rotary damping devices having an input, an output and a viscous fluid coupling to provide a resistance torque to relative rotation between the input and output which is zero when the relative speed between the input and output is zero and which rises generally linearly with relative speed between the input and output, the other rotary damping device having an input and an output and a torque resisting friction coupling which resists relative rotation between the input and output up to a certain torque above which the friction coupling allows slippage between the input and output with a substantially constant torque resistance whereby the two rotary damping devices provide a combined speed/torque characteristic in which resistance torque generated by the viscous coupling rises with speed to a certain level at which the resistance torque generated by the viscous coupling causes the friction coupling to slip whereafter the torque resistance offered by the damper remains substantially constant for higher speeds.