| 摘要 |
A bit accessory 500 for a bit 600 has a sleeve (510, figure 8) with a cavity (511, figure 8) running through the sleeve and a limiting member 550 with a hole (551, figure 8) running through the limiting member. The sleeve includes a first stopping portion (531, figure 8) for stopping the limiting member from passing through the cavity and the limiting member includes a first hole wall portion (552, figure 9) forming a first hole wall which provides the limiting hole with a minimum hole diameter and a second hole wall portion (553, figure 9) forming a second hole wall which provides the limiting hole with a maximum hole diameter. The limiting member is accommodated in the cavity The axis of the hole is parallel to the axis of the cavity when the limiting member is stopped by the first stopping portion. The accessory may further include a functioning member (140, figure 2) for holding a screw on the bit. Alternatively a rubber installation casing (120, figure 2) elastically covers a portion of the bit. The installation casing allows the bit to move over a determined range. |
