| 摘要 |
PCT No. PCT/FR88/00017 Sec. 371 Date Sep. 29, 1988 Sec. 102(e) Date Sep. 29, 1988 PCT Filed Jan. 8, 1988 PCT Pub. No. WO88/05637 PCT Pub. Date Aug. 11, 1988.Helmet provided with a signal ensuring the user that the locking of the retention system is totally achieved. In the case represented, the signal is a sound source (9) which is powered by a battery (8). Plate (2) of chin strap (7) is secured to shell (1) and is also part of the power supply circuit for signal (9). The circuit is activated when a force exerted against textile tape (4) by the user's head is sufficient to establish contact between a flexible blade (19) and plate (2). The signal stops emitting when the force disappears, upon removal of the helmet or when the chin strap (7) is sufficiently tensioned towards the inside of the helmet and is therefore properly fastened to separate flexible blade (6) from its contact point on extension (13) of plate (2). The device is particularly adapted to helmets for motorcyclists.
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