# US 11,111,947 B2 · Threaded fastener having a thread crest greater than its thread root and v angles on the crest and root

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- Number: US 11,111,947 B2
- Document ID: US11111947B2
- Status: Granted
- Kind: B2
- Application number: 15/999,030
- Filed: 2018-08-20
- Published: 2019-02-28
- Granted: 2021-09-07
- Earliest claimed: 2011-11-22
- Assignees: Lock-N-Stitch, Inc.
- Applicants: Lock-N-Stitch, Inc.
- Inventors: Gary Jack Reed
- Web page: https://patentgrep.com/patent/US11111947B2

## CPC

- F16B 33/02: Shape of thread; Special thread-forms ({F16B25/00 takes precedence; used to remove paint or dirt layers F16B35/007, F16B37/002}; used as screw-locking device F16B39/30)
- B23G 5/06: Taps (chucks therefor B23B31/00)
- B23G 2210/48: Threads having a special form or profile not otherwise provided for
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)
- B23G: THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH (making helical grooves by turning B23B5/48, by milling B23C3/32, by forging, pressing, or hammering B21K1/56, by grinding B24B19/02; arrangements for copying or controlling B23Q; thread-forming by corrugating tubes B21D15/04, by rolling B21H3/02)

## Abstract

An interlocking thread with a tooth-cross-section that is wider at its crest than at its root and with “V” angles located both along the crest and the root which tightens into a tapped hole that has a similar thread cross-section.

## Claims

### Claim 1

A fastener, comprising:
a shaft having a first end including means to rotate said shaft,
said shaft having a thread pattern defined by a thread projecting from an outer periphery of said shaft and spiraling along its length, and a root gap separating adjacent threads;
said thread defined by an upper flank, a lower flank, a root adjacent said shaft and crest remote from said shaft,
said upper and lower flanks being separated by a “V” shaped indentation and diverging outwardly from each other away from said root and defining a dovetail, wherein an apex of said “V” shaped indentation has an acute angle; and
a “V” shaped protrusion protruding from said shaft in said root gap, the “V” shaped protrusion having a shape complementary to said “V” shaped indentation.

### Claim 2 (depends on 1)

The fastener of claim 1, wherein said “V” shaped indentation is defined by facing inner surfaces of said upper and lower flanks, the inner surfaces converging towards said root to form said “V” shape.

### Claim 3 (depends on 2)

The fastener of claim 2, wherein said two surfaces converge at said apex.

### Claim 4 (depends on 1)

A method of fabricating the fastener of claim 1, comprising:
a first flank forming step wherein said upper and lower flanks are formed on said shaft parallel to one another; and
a second flank forming step wherein said upper and lower flanks are swaged outwardly to define said “V” shaped indentation and dovetail.