Abstract: A clutch peak torque limiter for regulating the flow rate of fluid between a clutch master cylinder and slave cylinder in a vehicle transmission, the valve having a non-return valve for allowing free flow of fluid from the clutch master cylinder to the clutch slave cylinder, a return orifice for allowing return flow of fluid from the slave cylinder to the master cylinder, and a pressure controlled valve in parallel with the non-return valve and return orifice for allowing flow of fluid between the slave cylinder and the master cylinder, the valve opening when the pressure on either side of the pressure controlled valve exceeds a predetermined level.

Abstract: A clutch peak torque limiter for regulating the flow rate of fluid between a clutch master cylinder and slave cylinder in a vehicle transmission, the valve having a non-return valve for allowing free flow of fluid from the clutch master cylinder to the clutch slave cylinder, a return orifice for allowing return flow of fluid from the slave cylinder to the master cylinder, and a pressure controlled valve in parallel with the non-return valve and return orifice for allowing flow of fluid between the slave cylinder and the master cylinder, the valve opening when the pressure on either side of the pressure controlled valve exceeds a predetermined level.

Abstract: A repeater for use in a control network includes isolating transformers at its root input/output and at a plurality of branch input/outputs. There is a line receiver and a line driver circuit associated with each of the isolating transformers. To determine the direction of transmission of signals through the repeater, there is a common mode voltage detector which detects a common mode voltage imposed on the wiring to the root side of the root transformer. A corresponding common mode voltage is imposed by the repeater on the branch side of each of the branch transformers. The repeater also includes a logic circuit for testing the validity of signals received from the branches and ensuring that only valid signals are passed to the root transformer.

Abstract: A stage lighting lamp unit includes a processor for receiving control data from a remote console. Beam orientation data for the lamp unit is passed to the lamp in the form of the x, y and z co-ordinates of a point in space through which the beam is to pass. The processor divides the required lamp travel into a number of stages dependent on execution duration data sent with the position data, and calculates, for each stage, a new value for pan and tilt angles for the lamp. These values are passed to pan and tilt controlling co-processors which control servo-motors for pan and tilt operation. The lamp unit also incorporates a rotatable shutter for interrupting the lamp beam when required. The shutters of all the lamps in a system can be instructed from the remote console to open and close in synchronism, thereby providing a stroboscopic effect.