SCREW-TYPE FASTENER

• US 20170122356A1
• Filed: 01/18/2017
• Published: 05/04/2017
• Est. Priority Date: 02/17/2015
• Status: Active Grant

• Current Assignee: Hillman Group Incorporated (Hillman Solutions Corp.)
• Original Assignee: Hillman Group Incorporated (Hillman Solutions Corp.)
• Inventors: Lajewardi, Farhad, Falkenstein, Michael K.
• Granted Patent: US 10,247,219 B2
• Time in Patent Office: Days
• CPC Class Codes: F16B 25/00 Screws that cut thread in the body into which they are screwed, e.g. wood screws F16B35/065 takes precedence; joining sheets or plates using screws with two separate threads F16B5/0275, using screws with adjustment sleeves F16B5/0283
• CPC Class Codes: F16B 25/0015 the material being a soft organic material, e.g. wood or plastic F16B25/0031 takes precedence
• CPC Class Codes: F16B 25/0052 the ridge having indentations, notches or the like in order to improve the cutting behaviour
• CPC Class Codes: F16B 25/0057 the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
• CPC Class Codes: F16B 25/0068 with multiple-threads, e.g. a double thread screws
• CPC Class Codes: F16B 25/103 by means of a drilling screw-point, i.e. with a cutting and material removing action

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. The tapered end of the thread may include a polygonal cross-sectional shape.

Claims

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, and

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.

2. The screw of claim 1 wherein the tapered end defines a point of the screw, the high thread begins at a location spaced apart from the point, and the low thread begins at a location spaced apart from the point.

3. The screw of claim 1 wherein the tapered end defines a point of the screw, the high thread begins at the point, and the low thread begins at the point.

4. The screw of claim 1 wherein,

an axially extending cut is located along the tapered end 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.

5. The screw of claim 4 wherein the cut extends from the tapered end into at least part of the shank.

6. The screw of claim 5 wherein the core of the tapered end is configured to have a polygonal transverse cross-section along at least a portion of its length, the polygonal transverse cross-section includes at least five sides, including two sides that define a perimeter of the axially extending cut.

7. The screw of claim 6 wherein the two sides defining the axially extending cut are oriented perpendicular to each other.

8. The screw of claim 4 wherein the axially extending cut creates at least one discontinuity in the high thread on the tapered end and at least one discontinuity in the high thread on the shank, and the axially extending cut creates at least one discontinuity in the low thread on the tapered end and at least one discontinuity in the low thread on the shank.

9. 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 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.

10. The screw of claim 9 wherein an axially extending cut is located along the tapered end 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.

11. The screw of claim 10 wherein the cut forms a ninety degree channel in the core, wherein the cut extends from the tapered end into the shank to a fourth intermediate point located between the tapered end and the third intermediate point.

12. The screw of claim 11 wherein the fourth intermediate point is closer to the tapered end than to the third intermediate point.

13. The screw of claim 10 wherein the core of the tapered end is configured to have a polygonal transverse cross-section along at least a portion of its length, the polygonal transverse cross-section includes at least five sides, including two sides that define a perimeter of the axially extending cut.

14. 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 the tapered end includes a polygonal transverse cross-sectional shape;

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.

15. The screw of claim 14 wherein:

the polygonal transverse cross-section is formed in part by sidewalls of an axially extending cut.

16. The screw of claim 15 wherein:

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.

17. The screw of claim 15 wherein the polygonal transverse cross-section includes at least three sides.

18. The screw of claim 15 wherein the polygonal transverse cross-section includes at least five sides.

19. The screw of claim 14 wherein the polygonal transverse cross-section is triangular in shape.

20. The screw of claim 14 wherein the polygonal transverse cross-section includes at least three sides.