| 摘要 |
<p>The adjustable locking device, particularly suitable for securing a motor-cyclists's helmet to his machine when not in use, comprises a housing having fixed and movable portions to form a clamp between which portions the rim of a helmet may be gripped. A toothed element mounted in the housing serves to locate the movable position and a further toothed element may be brought into engagement with the former by rotation of a key operated lock.</p> |
