Expansion anchor used for thin board characterized by preventing the screw rod from screwing the expansion anchor and preventing the screw rod from protruding out of the end part of the front part, thereby avoiding the damage of the vertical bord on the bottom of the undercut blind hole
The present invention relates to the expansion anchor (1) used for thin board such as the vertical board (15). The present invention proposes the expansion anchor (1) which is constituted by the through hole (6) served as the core hole of the inner thread (8) and unpenetratedly constituting the inne...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The present invention relates to the expansion anchor (1) used for thin board such as the vertical board (15). The present invention proposes the expansion anchor (1) which is constituted by the through hole (6) served as the core hole of the inner thread (8) and unpenetratedly constituting the inner screw thread (8). By this example, it prevents the screw rod from screwing through the expansion anchor (1) and prevents the screw rod from protruding out of the end part (4) of the front panel, thereby avoiding the damage of the vertical board (15) on the bottom of the undercut blind hole (16). |
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