Abstract A combined threaded fastener and a collar adapted to be secured to the fastener around the shank portion of the fastener adjacent the head thereof. The shank portion of the fastener is adapted with a shoulder portion disposed adjacent the head portion and extending lengthwise of the shank of the threaded fastener for a predetermined extent. Adjacent the shoulder is an annular groove which in the preferred embodiment is generally circular in cross-section. The collar has an annular flange which serves as the bearing portion and is adapted to cooperate with the head portion of the fastener and a sleeve portion attached or extending longitudinally of the flange or bearing portion. The sleeve portion has a diameter sufficient so as to receive the shank portion of the fastener therein. The sleeve portion of the collar is also adapted with an annular groove which again in the preferred embodiment is substantially of circular cross-section. The annular groove is selected so as to be less than the thickness of the mounting means into which the fastener and collar are installed and further is adapted to contain a volume of material in the remaining portion of the sleeve adjacent said groove so as to be compressible into the annular groove of the fastener shank.
The combination of a threaded fastener having a head portion and a shank portion and a collar adapted to be secured to said fastener around said shank portion adjacent said head portion, however, permitting relative rotary motion of said fastener with respect to said collar while preventing relative axial motion therebetween, wherein the improvement comprises: said shank portion having a shoulder portion disposed adjacent said head portion said shoulder portion extending lengthwise of said shank for a predetermined extent; said threaded fastener shank portion being provided with an annular groove adjacent said shoulder portion, said groove having a width substantially equal or exceeding its depth and having a cross-section with a generally arcuate perimeter; said collar having an enlarged bearing portion adapted to cooperate with the head portion of said fastener and a cylindrical sleeve portion extending longitudinally of said bearing portion said sleeve portion having a diameter of sufficient dimension so as to rotatably receive the shank portion of said fastener therein; said collar sleeve portion being further provided with an annular groove adjacent said bearing portion, said groove having a width substantially equal to or greater than its depth and having a cross-section with a generally arcuate perimeter, however, said width of said groove being less than the thickness of the mounting device into which said combined fastener is installed, the material of said sleeve proximate said groove being compressible into said groove in said shank portion; said collar sleeve portion being further provided at its end opposite said bearing portion with a flange extending generally longitudinally of said sleeve and adapted to be swagged against said mounting device to secure said fastener therein.
Claim 2
Dependent Claim
276 words
The combination of a threaded fastener having a head portion and a shank portion and a collar adapted to be secured to said fastener around said shank portion adjacent said head portion, however, permitting relative rotary motion of said fastener with respect to said collar while preventing relative axial motion therebetween, wherein the improvement comprises: said shank portion having a shoulder portion disposed adjacent said head portion said shoulder portion extending lengthwise of said shank for a predetermined extent; said threaded fastener shank portion being provided with an annular groove adjacent said shoulder portion, said groove having a width substantially equal or exceeding its depth and having a cross-section with a generally arcuate perimeter; said collar having an enlarged bearing portion adapted to cooperate with the head portion of said fastener and a cylindrical sleeve portion extending longitudinally of said bearing portion said sleeve portion having a diameter of sufficient dimension so as to rotatably receive the shank portion of said fastener therein; said collar sleeve portion being further provided with an annular groove adjacent said bearing portion, said groove having a width substantially equal to or greater than its depth and having a cross-section with a generally arcuate perimeter, however, said width of said groove being less than the thickness of the mounting device into which said combined fastener is installed, the material of said sleeve proximate said groove being compressible into said groove in said shank portion; said collar sleeve portion being further provided at its end opposite said bearing portion with a flange extending generally longitudinally of said sleeve and adapted to be swagged against said mounting device to secure said fastener therein.