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SCREW FROM A SHAFTS WITH A LARGE THREAD INCREASE AND A SCREW HEAD, FOR TURNING INTO A BASE WITH LOW EXTENSION STRENGTH.
SCREW FROM A SHAFTS WITH A LARGE THREAD INCREASE AND A SCREW HEAD, FOR TURNING INTO A BASE WITH LOW EXTENSION STRENGTH.
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机译:从具有大的螺纹增加的轴和螺钉头上拧下,以变成低强度的底座。
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摘要
It is intended to mount sealing webs (2) directly into a support (10) with a low pull-out resistance, for example into aerated concrete, using a screw consisting of a shank (1) and a screw head (4). A washer (3) is inserted under the screw head (4). Constructed on the circumferential region of the screw head (4) is a profiling in the form of a milled edge (6), which considerably increases the insertion torque of the screw and, in the directly final screwing-in section, digs into the countersink opening of the washer (3), which cannot rotate as a result of friction and/or force-locking, and thus considerably increases the torque. As a result of this increase in torque as the screw is screwed in, the torque coupling of a screwdriver is initiated, thus preventing overrotation of the shank (1) which is provided with a coarse thread pitch. IMAGE
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