Abstract: A vehicle seat including at least two components connected, directly or indirectly, by an adjustment mechanism. A locking means is provided, arranged to lock the two components relative to each other when predetermined conditions are experienced, to restrict relative movement of the two components. The locking means may be arranged to engage when a vehicle in which the seat is mounted is involved in an impact. The locking means reduces the amount of relative movement of seat components owing to compliance in seat adjustment mechanism in the event of a vehicle impact.

Abstract: A vehicle seat having means (24) arranged to positively displace a part of the seat relative to either another part of the seat and/or a vehicle in which the seat is mounted, in the event that predetermined conditions corresponding to a vehicle impact are encountered. The seat may be displaced by an actuator trigger by an electronic control unit in dependence on conditions sensed by one or more vehicle impact sensors.

Abstract: A vehicle seat including at least two components connected, directly or indirectly, by an adjustment mechanism. A locking means is provided, arranged to lock the two components relative to each other when predetermined conditions are experienced, to restrict relative movement of the two components. The locking means may be arranged to engage when a vehicle in which the seat is mounted is involved in an impact. The locking means reduces the amount of relative movement of seat components owing to compliance in seat adjustment mechanism in the event of a vehicle impact.

Abstract: A communications apparatus comprising a plurality of communication devices each having a plurality of ports and a data bus interconnecting the plurality of units, wherein each device is provided with means enabling the device to detect automatically its position on the data bus.

Abstract: The occurrence of collision and activity in a computer network is indicated by activation of a visual indication device. The device is activated for periods which are longer than the actual periods of collision and activity to permit the human eye to register the visual indications. This is particularly useful for high speed networks where the periods of collision and activity may be very brief.

Abstract: A repeater for a computer network, and a network incorporating such a repeater are described in which repeater communication addressed to a subset of the devices connected to the repeater are transmitted in a corrupt or scrambled form to other network devices. The processing load is thus reduced for such other network devices, in particular in the context of high volume multicast traffic such as in video conferencing.