{
  "abstract": "A rotatable driving tool for imparting torque to a driven member, such as a threaded fastener having an axial recess in the head thereof, comprises a circularly cylindrical body with a plurality of substantially circularly helical driving portions projecting laterally therefrom and equiangularly spaced about the cylindrical axis, each of the driving portions having a small helix angle, preferably between one and three degress. The driving portions mate with lobes of the fastener recess but are slightly inclined with respect thereto to provide a wedge fit to retain the fastener in engagement with the tool body.",
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  "title": "Torque driving tool and retainer for driven member",
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