| 摘要 |
A detachable and reusable expansion bolt comprises an expansion bolt shank (10) which has a threaded cylindrical surface (12) and a taper expansion head (11) in its front end; an expansion sleeve (20) which is threaded on the inner and outer cylindrical surface and includes a plurality of expansion lugs (21) in its front end and a multi-face fastening (24) in the opposite end; and an adjustable sleeve (30) which has a threaded portion and a smooth portion in its inner cylindrical surface and a multi-face fastening (31) in its tail end. Said smooth portion, on which is provided with a plurality of directive projections (33), is disposed in the opposite end of said adjustable sleeve which is adjacent to said expansion lugs. The expansion bolt according to the invention which fixed force is adjustable at the user's desire overcomes the drawback to difficulty in detaching and is reusable. |
