| 摘要 |
A signal counting device for actuating a plurality of output devices, the device comprising: indexing means adapted to register receipt of an actuating signal and to cause actuation of the output devices when a predetermined number of actuating signals for each output device has been received. The indexing means is adapted to cause actuation of a particular output device when a different predetermined number of actuating signals has been received such that the output devices are sequentially actuatable. The activation signal may be by means of a dropped object 30. The indexing means may be a sleeve fitted with collet fingers 24, 28 that protrude into a series of recesses or grooves 16 on the inside of a tubular member 10. |
