Screw-type fastener
First Claim
Patent Images
1. A screw, comprising:
- a head end, a shank and a tapered end,the head end including a tool engaging part, the head end located at one end of the shank and the tapered end located at an opposite end of the shank,wherein multiple threads are formed along the screw including;
a high thread that begins on the tapered end, extends onto the shank and terminates short of the head end, the high thread having a peripheral edge, at least a portion of the peripheral edge beginning on the tapered end and extending at least partly along the shank includes a series of notches formed therein,a low thread that begins on the tapered end, extends onto the shank and terminates short of a termination point of the high thread, the low thread having a peripheral edge that defines a low thread major diameter on the shank that is less than a high thread major diameter defined on the shank by the peripheral edge of the high thread, wherein a pitch of the low thread matches a pitch of the high thread,a set of intermediate threads, having a common pitch, and located solely along the shank.
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Abstract
A multi-thread screw includes a head end, a shank and a tapered end. Both a high thread and a low thread begin on the tapered end and extend onto the shank. A set of intermediate threads are located on the shank portion only and overlap with and intersect at least part of the high thread.
89 Citations
21 Claims
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1. A screw, comprising:
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a head end, a shank and a tapered end, the head end including a tool engaging part, the head end located at one end of the shank and the tapered end located at an opposite end of the shank, wherein multiple threads are formed along the screw including; a high thread that begins on the tapered end, extends onto the shank and terminates short of the head end, the high thread having a peripheral edge, at least a portion of the peripheral edge beginning on the tapered end and extending at least partly along the shank includes a series of notches formed therein, a low thread that begins on the tapered end, extends onto the shank and terminates short of a termination point of the high thread, the low thread having a peripheral edge that defines a low thread major diameter on the shank that is less than a high thread major diameter defined on the shank by the peripheral edge of the high thread, wherein a pitch of the low thread matches a pitch of the high thread, a set of intermediate threads, having a common pitch, and located solely along the shank. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A screw, comprising:
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a head end, a shank and a tapered end, the head end including a tool engaging part, the head end located at one end of the shank and the tapered end located at an opposite end of the shank, wherein multiple threads are formed along the screw including; a high thread that begins on the tapered end, extends onto the shank and terminates at a first intermediate point between the tapered end and the head end, the high thread having a first axial extent, a second axial extent and a peripheral edge, wherein the first axial extent begins on the tapered end and extends onto the shank to a second intermediate point between the tapered end and the first intermediate point, the second axial extent begins at the second intermediate point and extends to the first intermediate point, the peripheral edge along the first axial extent including a series of notches formed therein, and the peripheral edge along the second axial extent lacks any notches, a low thread that begins on the tapered end, extends onto the shank and terminates at a third intermediate point between the tapered end and the second intermediate point, the low thread having a peripheral edge that defines a low thread major diameter on the shank that is less than a high thread major diameter defined on the shank by the peripheral edge of the high thread, wherein a pitch of the low thread matches a pitch of the high thread, a set of intermediate threads located solely along the shank, each intermediate thread having a pitch that is at least six times the pitch of the high thread. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A screw, comprising:
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a head end, a shank and a tapered end, the head end including a tool engaging part, the head end located at one end of the shank and the tapered end located at an opposite end of the shank, wherein the tapered end includes a polygonal transverse cross-sectional shape formed in part by sidewalls of an axially extending cut; wherein multiple threads are formed along the screw including; a high thread that begins on the tapered end and extends onto the shank, the high thread having a peripheral edge, at least a portion of the peripheral edge beginning on the tapered end and extending at least partly along the shank includes a series of notches formed therein, and a low thread that begins on the tapered end and extends onto the shank, the low thread having a peripheral edge that defines a low thread major diameter on the shank that is less than a high thread major diameter defined on the shank by the peripheral edge of the high thread, wherein a pitch of the low thread matches a pitch of the high thread; a set of intermediate threads, having a common pitch, and located along the shank, each intermediate thread having a peripheral edge that defines an intermediate thread major diameter that is less than the low thread major diameter; the high thread terminates on the shank short of the head end; the low thread terminates on the shank short of a termination point of the high thread; the axially extending cut extends from the tapered end into at least part of the shank and defines both an inward recess in a core of the tapered end and a discontinuity of both the high thread and the low thread.
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21. A screw, comprising:
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a head end, a shank and a tapered end, the head end including a tool engaging part, the head end located at one end of the shank and the tapered end located at an opposite end of the shank, wherein the tapered end includes a polygonal transverse cross-sectional shape formed in part by sidewalls of an axially extending cut; wherein multiple threads are formed along the screw including; a high thread that begins on the tapered end and extends onto the shank, the high thread having a peripheral edge, at least a portion of the peripheral edge beginning on the tapered end and extending at least partly along the shank includes a series of notches formed therein, and a low thread that begins on the tapered end and extends onto the shank, the low thread having a peripheral edge that defines a low thread major diameter on the shank that is less than a high thread major diameter defined on the shank by the peripheral edge of the high thread, wherein a pitch of the low thread matches a pitch of the high thread; wherein the head end includes; a frusto-conical part tapering from the tool engaging part to the shank, the frusto-conical part including a plurality of outwardly protruding spaced apart nibs, each nib having a first end proximate the tool engaging part and extending toward the shank to a second end that is spaced from the shank, each nib having a base width that varies from a first width at the first end and tapers to a lesser width at the second end, each nib having a leading face and a trailing face that meet to define a nib ridge, wherein the nib ridge has a height that varies from a first height at the first end and decreases to a second height at the second end, wherein an angle of intersection of the leading face with the surface of the frusto-conical part is between ninety degrees and one-hundred ten degrees and an angle of intersection of the trailing face with the surface of the frusto-conical part is between one-hundred thirty degrees and one-hundred forty degrees, wherein the leading face is substantially planar and the trailing face is substantially concave, wherein each nib extends in a direction that includes both a component parallel to a center axis of the screw and a component radially inward toward the center axis of the screw.
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Specification