06-03-2014 дата публикации
Номер: US20140060268A1
Принадлежит:
TTAPDRIVE AS
The invention provides a screw in which the screw head () has a slot () in the upper surface of the screw head, an upper peripheral wall () of regular planform extending down from the rim of the slot into the screwhead, the upper peripheral wall () being generally aligned with the axis of the screw to form a recess (), a sloping transition surface (), extending downwardly and inwardly with respect to the lower edge of the upper peripheral wall (), and a further recess () extending downwardly from the lower edge of the sloping transition surface (), in which the dimensions of the screw head are such that when the screwhead is engaged by a tool () having upper () and lower () engagement sections, and in which the upper engagement section () extends downwardly with respect to the axis of the screw to which the tool is to engage and the lower engagement section () extends further downwardly, and in which there is at least one protrusion (or rib) () on the inside wall () of the further recess (), so that there is a ‘stick fit’ between the protrusion () on the inside wall () of the further recess () and the lower engagement section () of the tool (). 112. A screw with an axis and comprising a screw head () having a slot () in an upper surface of the screw head , wherein{'b': 9', '9', '3, 'an upper peripheral wall () of regular planform extends down from a rim of the slot into the screwhead, the upper peripheral wall () being generally aligned with the axis of the screw to form a recess (),'}{'b': 15', '9, 'a sloping transition surface () extends downwardly and inwardly with respect to the lower edge of the upper peripheral wall (), and'}{'b': 11', '15', '11', '12', '6', '16', '9', '17', '11', '21', '21', '12', '11', '21', '21', '12', '11', '17', '6', '1', '6, 'i': a,', 'b', 'a,', 'b, 'a further recess () extends downwardly from the lower edge of the sloping transition surface (), the further recess () comprising an inside wall (), wherein the screwhead is adapted for ...
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