| 摘要 |
<p>A locking catch (13) fits between the four sides (11,31,16, 17) of a recess in the device. One of these sides has a cam block (19) projecting from it with a sloping surface (20) against which is held the sloping part of a locking arm (23) of the catch. This arm is held in contact by a spring (25) behind its head (24) above the sloping part. When the catch is forced out of recess, the arm is swung from its sloping position into an upright position as one sloping part slides over the other. In the fully engaged position, a pointed tip (14) on the catch locks behind the rail (15).</p> |
