Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
318 words
A push-type threaded fastener designed to be driven into an opening formed in pliable resilient material without rotation thereof, and when seated, rotated to provide a locking action which resists inadvertent rotation thereof, said fastener comprising in combination; a head portion to abut the material around the opening receiving the fastener, a threaded shank having a leading guide portion adjacent the work-entering end of said fastener and a trailing locking portion intermediate said guide portion and said head portion, said leading guide portion including a plurality of thread turns of a generally circular configuration with a crest diameter of said thread turns increasing in a direction away from said work-entering end; said trailing portion including a plurality of thread turns of a noncircular, multilobular configuration, said non-circular threads having a maximum crest height at the lobe portions thereof which is greater than the maximum crest height of said circular thread turns on said leading guide portions, both said circular and noncircular threads having a sloped front flank surface facing toward the leading end of said threaded shank to allow the pliable, resilient material easily to slide thereof as the fastener is driven into the opening formed in said material, and a sloped rear-flanked surface facing toward head portion, said front flank defining a flank angle from about 40* to 60*, with said rear flank defining a flank angle from about 20* to 0*, such that the included angle is approximately 60*, with said flank surfaces merging smoothly to define a crest apex over which said resilient material will flow and conform to the shape of said crest apex to be disposed on opposite sides thereof thereby providing means which resists pullout, wherein said fastener may be rotated a fractional part of a revolution to cause said lobular portion on the trailing non-circular thread to bite into the resilient material and afford a locking action which resists inadvertent rotation.
Claim 2
Dependent Claim
318 words
A push-type threaded fastener designed to be driven into an opening formed in pliable resilient material without rotation thereof, and when seated, rotated to provide a locking action which resists inadvertent rotation thereof, said fastener comprising in combination; a head portion to abut the material around the opening receiving the fastener, a threaded shank having a leading guide portion adjacent the work-entering end of said fastener and a trailing locking portion intermediate said guide portion and said head portion, said leading guide portion including a plurality of thread turns of a generally circular configuration with a crest diameter of said thread turns increasing in a direction away from said work-entering end; said trailing portion including a plurality of thread turns of a noncircular, multilobular configuration, said non-circular threads having a maximum crest height at the lobe portions thereof which is greater than the maximum crest height of said circular thread turns on said leading guide portions, both said circular and noncircular threads having a sloped front flank surface facing toward the leading end of said threaded shank to allow the pliable, resilient material easily to slide thereof as the fastener is driven into the opening formed in said material, and a sloped rear-flanked surface facing toward head portion, said front flank defining a flank angle from about 40* to 60*, with said rear flank defining a flank angle from about 20* to 0*, such that the included angle is approximately 60*, with said flank surfaces merging smoothly to define a crest apex over which said resilient material will flow and conform to the shape of said crest apex to be disposed on opposite sides thereof thereby providing means which resists pullout, wherein said fastener may be rotated a fractional part of a revolution to cause said lobular portion on the trailing non-circular thread to bite into the resilient material and afford a locking action which resists inadvertent rotation.
Claim 3
Dependent Claim
21 words
The push type threaded fastener according to claim 1, wherein said non-circular, enlarged diameter threads are tri-roundular in the cross section.