Sealing fastener with multiple threads
AssigneeHargis Industries L.P.
InventorJoe A. Hargis
Life of this patent
Estimating the term…
Abstract
A screw having a primary thread extending along its shank and terminating at the screw head is formed with a supplemental thread extending between adjacent convolutions of the primary thread and also terminating at the head of the screw. The spaced termini of the two threads maintain a washer at the head in a position perpendicular to the axis of the shank of the screw.
Claims12
A fastener for joining an object to another structure and comprising a head having a portion adapted for receiving torque to rotate said fastener, and an annular tapered portion joined to said torque receiving portion, and a shank joined to and extending from said annular tapered portion and terminating in a point adapted to extend through a preformed aperture in said object or create such an aperture as it is rotatably forced against said object,
- said shank having a primary thread continuously extending along its periphery from at least a location removed from said head and ending at said annular tapered portion in a primary terminus along the circumference of said shank, said primary thread having a pitch and being spirally wound about said shank in convolutions spaced to create a continuous, unthreaded portion of said shank between said primary thread convolutions, and
- a supplemental thread located in at least a part of said continuous unthreaded portion of said shank between said primary thread convolutions, said supplemental thread ending at said annular tapered portion in a supplemental terminus spaced from said primary terminus along the circumference of said shank.
The combination of a fastener for joining an object to another structure and comprising a head and a shank joined to and extending from said head and terminating in a point adapted to extend through a preformed aperture in said object or create such an aperture as it is rotatably forced against said object,
- said shank having a primary thread continuously extending along its periphery from at least a location removed from said head and ending at said head in a primary terminus along the circumference of said shank, said primary thread having a pitch and being spirally wound about said shank in convolutions spaced to create a continuous, unthreaded portion of said shank between said primary thread convolutions, and
- a supplemental thread located in said continuous unthreaded portion of said shank between said primary thread convolutions, said supplemental thread ending at said head in a supplemental terminus spaced from said primary terminus along the circumference of said shank,
- and a washer having an aperture therethrough and positioned with said fastener shank extending through said aperture, said washer being located at said termini of said primary and supplemental threads and being supported against axial movement in the direction of said shank point by said termini.
The combination of a fastener for joining an object to another structure and comprising a head, and a shank joined to and extending from said head and terminating in a point adapted to extend through a preformed aperture in said object or create such an aperture as it is rotatably forced against said object,
- said shank having a primary thread continuously extending along its periphery from at least a location removed from said head and ending at said head in a primal terminus along the circumference of said shank, said primary thread having a pitch and being spirally wound about said shank in convolutions spaced to create a continuous, unthreaded portion of said shank between said primary thread convolutions, and
- a supplemental thread located in said continuous unthreaded portion of said shank between said primary thread convolutions, said supplemental thread ending at said head at a supplemental terminus spaced from said primary terminus along the circumference of said shank,
- said head having a portion thereof to receive torque applied to rotate said screw, said torque receiving portion being joined in the direction of said shank to an outwardly extending flange to which is attached an annular, tapered portion that is substantially frusto-conical in shape with the lesser diameter frustum being located at said shank and being of substantially the same diameter as said shank,
- and a resilient washer having an aperture therethrough and positioned with said fastener extending through said aperture, said washer be located about said tapered portion of said head and being supported against axial movement along said shaft between said outwardly extending flange of said head and said termini of said primary and secondary threads.
Dependencies are inferred from the claim text.