| 摘要 |
The main object of the present invention is to achieve an anchoring bolt adapted to be anchored in a pre-drilled hole in a rigid material, which is simple and inexpensive to produce and which, after being used, can be taken out of the hole and used again. The anchoring bolt according to the invention comprises a tubular cylindrical body (1) internally screw threaded in one end portion (5) said portion being followed by a conical end portion (3). The body (1) is axially split open in a number of legs (9) in the conical end portion. In said portion a ball (4) is placed which is adapted to be forced axially by a fixing bolat (7) screwed into the screw threaded portion (5) of the tubular body (1). When moving axially the ball (4) will press the legs (9) radially against the surrounding material. The thread of the screw threaded end portion (5) consists of a roll thread (6) the inner-diameter of which is smaller than the original one of the hole (2) of the tubular body (1). |
