Resonance reducing arrangements

摘要

PCT No. PCT/GB92/01362 Sec. 371 Date May 27, 1994 Sec. 102(e) Date May 27, 1994 PCT Filed Jul. 23, 1992 PCT Pub. No. WO93/02462 PCT Pub. Date Feb. 4, 1993.The invention relates to a resonance reducing arrangement for a device displaceable between two positions. In one described embodiment the device (14) is displaced against the resilience of a spring (11) by causing an electrical device (15) to accelerate the device (14) towards its second position, terminating the force accelerating the device (14) to allow the device to continue to displace towards the second position and then reactivating the electrical device (15) to cause the electrical device (15) to expand to that position at which it holds the device (14) in its second position.