Composite fastener
AssigneeTextron Inc.
InventorsRoland H. Gapp, Clyde D. Simmons
Life of this patent
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Abstract
A composite fastener which provides up to 70 KSI in shear strength in a 1/4 inch shank diameter and includes several layers having long parallel carbon fibers embedded in resin. The layers are pressed together and heated to form a panel. The panel is cut into bars which are then machined into rods, used to form threaded or unthreaded composite shear pins. The fibers in adjacent layers are angled with respect to one another to provide maximum shear strength in a particular direction. The head of the shear pin is preferably marked to indicate the orientation of maximum shear strength.
Claims22
A fastener made of composite material, including a plurality of planar, generally parallel layers bonded together by a binder, said layers having elongated fibers, substantially all of the fibers in each layer extend generally parallel to the other fibers in that layer, said fastener having a shank with a longitudinal axis extending generally parallel to said layers, a head on one end of the shank, and indicia which indicates the orientation of said layers in said fastener.
A fastener made of a composite material including a plurality of planar, generally parallel layers bonded together by a binder, said layers having elongated fibers substantially all of the fibers in a layer extend generally parallel to each other, said layers being oriented so that fibers in selected layers are skewed with respect to fibers in other layers, said fastener having a shank with a longitudinal axis extending generally parallel to said axis, and indicia on said fastener which indicates the orientation of the fastener which has the highest shear strength in a direction perpendicular to said shank.
An elongated fastener having a shank with a longitudinal axis, said fastener being made of a composite material made of a group of successive layers which are generally planar across the width of said fastener shank and have fibers oriented at predetermined angles running therethrough, said group of successive layers comprising a first layer, having its fibers oriented at approximately 45.degree. with respect to said longitudinal axis, a second layer having its fibers oriented at approximately 135.degree. with respect to said longitudinal axis, a third layer having its fibers oriented substantially parallel to said longitudinal axis, and a fourth layer having its fibers oriented substantially parallel to said longitudinal axis.
An elongated fastener having a shank with a longitudinal axis, said fastener being made of a composite material made of a group of successive layers which are generally planar across the width of said fastener shank and fibers oriented at predetermined angles running therethrough, said group of successive layers comprising a first layer having its fibers oriented at approximately 45.degree. with respect to said longitudinal axis, a second layer having its fibers oriented at approximately 135.degree. with respect to said longitudinal axis, a third layer having its fibers oriented substantially parallel to said longitudinal axis, a fourth layer having its fibers oriented substantially parallel to said longitudinal axis, and indicia which indicates the orientation of said layers in said fastener.
An elongated fastener having a shank with a longitudinal axis, said fastener being made of a composite material made of a group of successive layers which are generally planar across the width of said fastener shank and fibers oriented at predetermined angles running therethrough, said group of successive layers comprising a first layer having its fibers oriented at approximately 45.degree. with respect to said longitudinal axis, a second layer having its fibers oriented at approximately 135.degree. with respect to said longitudinal axis, a third layer having its fibers oriented substantially parallel to said longitudinal axis, a fourth layer having its fibers oriented substantially parallel to said longitudinal axis, and indicia which indicates the orientation of the fastener that has the highest shear strength generally perpendicular to said fastener axis.
Dependencies are inferred from the claim text.