# US 10,865,824 B1 · Mushroom-compaction and asymmetric-thread impact-drivable screw

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,865,824 B1
- Document ID: US10865824B1
- Status: Granted
- Kind: B1
- Application number: 16/266,406
- Filed: 2019-02-04
- Granted: 2020-12-15
- Earliest claimed: 2006-04-07
- Applicants: W. C. Litzinger
- Inventors: W. C. Litzinger
- Web page: https://patentgrep.com/patent/US10865824B1

## CPC

- F16B 25/0015: {the material being a soft organic material, e.g. wood or plastic (F16B25/0031 takes precedence)}
- F16B 25/0042: {characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw}
- F16B 15/08: formed in integral series but easily separable
- F16B 25/0047: {the ridge being characterised by its cross-section in the plane of the shaft axis}
- F16B 25/0057: {the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections}
- F16B 25/0063: {with a non-threaded portion on the shaft of the screw}
- F16B 25/0084: {characterised by geometric details of the tip}
- F16B 15/06: with barbs, e.g. for metal parts; Drive screws
- F16B 25/106: {by means of a self-piercing screw-point, i.e. without removing material}
- 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)

## Abstract

An asymmetric thread impact drivable screw and clip for use with a power impact device for penetrating wood fibers while minimizing cut fibers. The screw includes an impact head and a conical shaped tip having a ballistic insertion angle at the ends of a shank. The shank defines asymmetrical threads with an insertion flank having a long side at a slide angle peaking at a crest supported by a catch flank positioned at a grip angle. Varying tool accepting recess are taught for the head along with multiple thread sections. A mushroom compaction thread section is also taught.

## Claims

### Claim 1

An asymmetric thread impact drivable screw apparatus for use with a impact device, the apparatus comprising:
an impact head;
a conical shaped tip having a single constant ballistic insertion angle between twenty three degrees and thirty three degrees along the entire length of the conical shaped tip;
a shank defining an axis, the shank having a shank diameter,
the shank having a first end connected to the impact head and a second end connected to the conical shaped tip,
the shank defining a spiral of asymmetrical threads with an insertion flank peaking at a crest with the crest supported by a catch flank, the conical shaped tip extending to the crest defining a thread diameter larger than the shank diameter, the threads having a pitch distance and a thread diameter, the thread diameter being approximately twice the pitch distance;
the insertion flank protruding from the shank at slide angle; and
the catch flank protruding from the shank at a grip angle of approximately forty degrees.

### Claim 2 (depends on 1)

The apparatus of claim 1, the impact head comprising:
a top surface defining a tool receiving recess.

### Claim 3 (depends on 2)

The apparatus of claim 2, the tool receiving recess defining a phillips aperture.

### Claim 4 (depends on 2)

The apparatus of claim 2, the tool receiving recess defining a square aperture.

### Claim 5 (depends on 1)

The apparatus of claim 1, the impact head connected to the first end of the shank by a tapered neck.

### Claim 6 (depends on 5)

The apparatus of claim 5, the tapered neck defining a neck angle of eighty degrees.

### Claim 7 (depends on 5)

The apparatus of claim 5, the tapered neck defining a neck angle between seventy eight degrees and eighty two degrees.

### Claim 8 (depends on 1)

The apparatus of claim 1, the shank further defining mushroom compaction threads.

### Claim 9 (depends on 1)

The apparatus of claim 1, the shank comprising:
a threaded shank section defining a major diameter; and
a non-threaded shank section defining a shank diameter, wherein the major diameter is larger than the shank diameter.

### Claim 10 (depends on 9)

The apparatus of claim 9, wherein the major diameter is ten percent larger than the shank diameter.

### Claim 11 (depends on 9)

The apparatus of claim 9, wherein the major diameter is up to twenty percent larger than the shank diameter.

### Claim 12 (depends on 1)

The apparatus of claim 1, the shank having a plurality of distinct threaded sections.