DE1894136U - TIN DRILLING SCREW. - Google Patents

Description

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Claims (6)

ΒΑ.3Π886 * -2.5.64 L 28 663 M7a Gm protection claims; 1.) Sheet metal drilling drive screw, which has a threaded part of constant thread height and a drill bit provided with longitudinal grooves possesses, characterized in that a part (d) adjoins the threaded part (c) of constant thread height (h), whose thread diameter gradually decreases towards the screw tip, that on it a threadless shaft (e) adjoins, and that the drill bit (f) adjoins it, the longitudinal grooves (n) of which up to the specified thread ·! loose shaft (s) are sufficient. 2.) sheet metal drilling drive screw according to claim 1, characterized in that that the entire shaft of the screw has the same diameter. 3.) sheet metal drilling drive screw according to claim 1 or 3, characterized in that the longitudinal groove (s) by cold hammering is made. 4.) sheet metal drilling drive screw according to claim 3, characterized in that that the longitudinal groove (s) produced by cold hammering during the manufacture of the tip 5.) Blechbohrtreibsehraube according to claim 1 or 3, characterized characterized in that the shaft in its threadless part (s) has a smaller diameter than in its part (c). 6.) sheet metal drilling drive screw according to claim 5, characterized in that the shaft is in the part (d ¹ ), the * between the part (c) of constant thread height and the S unthreaded part (e ¹ ) is tapered.