# US 7,744,323 B2 · Retractable nail device

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- Number: US 7,744,323 B2
- Document ID: US7744323B2
- Status: Granted
- Kind: B2
- Application number: 11/727,293
- Filed: 2007-03-26
- Published: 2007-08-02
- Granted: 2010-06-29
- Earliest claimed: 2005-10-11
- Inventors: Steve Songrok Kim
- Web page: https://patentgrep.com/patent/US7744323B2

## CPC

- F16B 15/02: with specially-shaped heads, e.g. with enlarged surfaces (ornaments for furniture A47B95/04; removable ornamental heads for nails A47G3/00)
- F16B 15/06: with barbs, e.g. for metal parts; Drive screws
- Y10S 411/999: with retainer, e.g. tether
- 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)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A retractable nail includes a head portion having a striking surface and a slot through the striking face. The slot is configured for receiving a removal tool. The nail includes a piercing part the head portion and the piercing part. A longitudinal main body is positioned between the longitudinal main body includes a front side, rear side and two lateral sides. The front and rear sides include respective front and rear helical thread segments formed along a longitudinal length of the main body. The threads are filled or covered with a plastic material, epoxy, glue, composite or the like to prevent damage to the helically threads when the device is hammered or bored with a pneumatically or electrically powered nail gun into a solid material.

## Claims

### Claim 1

A retractable nail for attaching a solid, fibrous or cellular material, which can be retracted without seriously destroying or damaging said material, said nail comprising:
a head portion comprising an elongated shape main head, the main head comprises a striking face and a slot configured for receiving a removal tool;
a secondary head attached to the main head, the secondary head breaks away from said main head when said removal tool is actuated;
a piercing part; and
a longitudinal main body comprising a front and rear sides with a helical thread along its longitudinal surface and two lateral sides substantially planar without said helical thread;
wherein a first width between said lateral sides is preferably larger than a second width between said front and rear sides; and
wherein gaps between said helical threads are substantially filled with a protective material to prevent damage to said helical threads when said nail is hammered or bored pneumatically or electrically powered into said solid, fibrous or cellular material.

### Claim 2 (depends on 1)

The retractable nail as claimed in claim 1, wherein said main head comprises a substantially circular outline.

### Claim 3 (depends on 1)

The retractable nail as claimed in claim 1, wherein said main head comprises a substantially oval periphery.

### Claim 4 (depends on 1)

The retractable nail as claimed in claim 1, wherein said main head comprises a slot having a substantially rectangular outline.

### Claim 5 (depends on 1)

The retractable nail as claimed in claim 1, wherein a lateral cross-section of the main body comprises a side having at least one of a convex, concave, elliptical, circular and planar shapes.

### Claim 6 (depends on 1)

The retractable nail as claimed in claim 1, wherein at least one of said helical threads on said front and rear side comprises a substantially radial cutting edge.

### Claim 7 (depends on 1)

The retractable nail as claimed in claim 1, wherein said protective material comprises any of a plastic material, epoxy, glue, or composite.