Adjustable wrenches

Abstract From the Canadian patent

An open end wrench and a socket wrench are described which are selectively adjustable to rotate fasteners dimensioned pursuant to The English system or the metric system. Both wrenches comprise first and second elements having parallel surfaces spaced apart to engage flats, of a given width on a, fastener. Parallel linkage means control relative movement of the two elements between first and second positions. In the first position, the linkage is parallel to the flat engaging surfaces and the flat engaging surfaces thereof are spaced for rotation of a fastener having flats of the given width. In the second relative position of the elements the linkage means is, generally normal to the flat …