Improvements relating to screws and threadforms

Details Improvements relating to screws and threadforms Improvements relating to screws and threadforms

B - Operations, Transporting

21

H

B21H 3/02 (2006.01) E01B 9/10 (2006.01) F16B 33/02 (2006.01)

Patent

CA 2277476

A screw thread having a threadform comprising a ridge (21) rising from root (23) to crest (26) with the crest having two peaks (27, 28) separated by a through (29) the depth of which is less than the height of the ridge from root to crest. It has particular use as a screw for timber, and is especially suited to fixing railway rails to sleepers.

La présente invention concerne un filet de vis dont le filetage comprend une crête (21) s'élevant depuis le fond (23) jusqu'au sommet (26), le sommet étant formé de deux pics (27,28) séparés par une gouttière (29) dont la profondeur est inférieure à la hauteur de la crête du fond jusqu'au sommet. Le filet de vis de la présente invention peut être utilisé dans les vis à bois en particulier et il est spécialement adapté à la fixation des rails de chemin de fer sur les traverses.

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