| 摘要 |
A clamping ring for securing a removable cover on a drum is provided with a closing device having a lever and a latch. The lever is pivotal in a plane parallel to that of the clamping ring from an outwardly extending open position inwardly to contract the ring into a closed position. The latch is pivoted downwardly until its latch finger extends through a slot in the lever finger to place the clamping ring in a sealed position. This sealed position is accomplished by means of a primary lock caused by the interengagement of a hook-tang on the latch finger and bottom surfaces of the lever finger adjacent the slot. A secondary lock is formed by the interengagement of an inwardly projecting tang on the latch finger which also engages with surfaces of the lever finger adjacent the slot.
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