| 摘要 |
A protection device of a batter head is disclosed. The device is characterized in that the hoop face of the counterhoop is spaced with a plurality of engaging disc with elastic hook, one-end of the engaging disc is provided with protruded ratchet teeth, a securing ring is locked to the front face of the batter head, and the rim face of the securing rim corresponding to the engaging disc is provided with a protruded inclined ratchet gear face to gradually lodge the batter head against the ratchet gear face on the engaging disc gradually.
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