| 摘要 |
The spacer screw has a thread section which can be inserted into a base member, a head section which can be introduced into a structural member and has a thread, and a shank section arranged in between. According to the invention, the thread is provided with a series of slits which in turn is formed from recesses running transversely to the screw axis and interrupting the thread turn at constant distances. When the screw is used, the thread is screwed into the structural member, which, in contrast to the use of known screws, is effected without excessive force. In addition, this screwing-in process takes place independently of the screwing of the thread section into the base member. When the thread section is screwed into the base member and when the head section is screwed into the structural member, the slit-like recesses do in fact generate a draw-in resistance, the draw-through force of the thread of the head section being reduced by the magnitude of said draw-in resistance. Because of this and because the screw head has a diameter d which is at least equal to the external diameter of the thread, when the screw head is sunk completely in the structural member the distance between the structural member and the base member can be reduced on screwing in and can be increased in an analogous manner on unscrewing.
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