F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/101
F16B 23/00 (2006.01) B25B 13/48 (2006.01)
Patent
CA 1088353
ROTARY DRIVE FASTENER ABSTRACT OF THE DISCLOSURE Disclosed is a rotary drive fastener of integral construction, which comprises fastening means having a central axis at extremes of which are driving and driven ends, and a driver engageable head on the driving end of the fastening means, the head having its central axis aligned with the central axis of the fastening means and the head in exterior configuration forming a hemispherical dome. A tapered asymmetric cavity is located generally centrally within the dome of the head, the cavity defining a circular open outer end and a circular closed inner end. The inner end is of smaller dimension than the outer end, the center of the open outer end is coaxial with the central axis of the head and the center of the closed inner end is offset therefrom. The asymmetric cavity comprises two portions interconnecting the open outer end and the closed inner end, one portion of the cavity being generated about a first axis which is parallel to the central axis and a second portion of the cavity being generated about a second axis which is at an acute angle relative to the central axis of the head and fastening means. The second axis of the cavity and the central axis of the head intersect at the top of the head whereby the cavity in the dome provides means for the engagement of a corresponding tool which has a recessed head for the application of torsional force to the fastener, the fastener being, by reason of the positioning of the axes described above, subject to captivation, the bottom portion of the cavity serving as a repository for the transfer of torque from the driver tool by means of a driving pin.
308097
Meredith & Finlayson
Pay Television Corporation
LandOfFree
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