Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – With hole forming means
Reexamination Certificate
2002-05-01
2004-01-20
Wilson, Neil (Department: 3679)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
With hole forming means
C411S178000, C411S387600, C411S395000
Reexamination Certificate
active
06679661
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an improved nail fastener for boarding and particularly to a fastener adopted for use on fragile boards and panels such as gypsum boards.
2. Description of the Prior Art
Conventional construction boards
61
and panels
62
(as shown in
FIGS. 4 and 5
) that have a relatively high density but do not have great strength such as gypsum boards are prone to crack when being nailed directly by a nail fastener
51
. To remedy this disadvantage, a boarding fastener
71
has been developed in the industry (as shown in FIG.
6
). The boarding fastener
71
includes a shank
711
and a blade
712
. The shank
711
has a top end forming a flange
713
and a screw thread section formed on the peripheral surface, and a substantially cross shaped through hole
714
formed in the center. The blade
712
is formed by extending a conical front end of the shank that being cut to form a pair of V-shaped nibs. Such a structure can decrease the damage that might otherwise incur to the gypsum board
81
when the nail is hit into the gypsum board
81
. However, there are still shortcomings when it is put to practical use, notably:
When the blade
712
on the nail nib is wedged into the board
81
, the blade
712
can perform drill function and discharge debris being generated from the drilling board. The debris is almost being discharged completely without remaining in the fastener
71
. As a result, the wedging of the fastener
71
in the board
81
becomes too loose, and the bonding strength between the fastener
71
and the board
81
, and between the screw
72
and the fastener
71
are not stronger enough. The fastening is not firm or secured. It could result in poor construction quality.
SUMMARY OF THE INVENTION
In view of aforesaid disadvantages, the primary object of the invention is to provide an improved fastener for boarding that has at least two debris troughs forming on the shank of the fastener and extending to the screw thread section and a through hole formed in the rear section of the debris troughs running through a center hole of the fastener so that a portion of the debris is discharged while a portion of th debris is retained in the fastener and the center hole, thereby the fastener can be fastened to the board firmly and securely without loosening or causing fractures or cracks on the board.
The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
REFERENCES:
patent: 5160225 (1992-11-01), Chern
patent: 5482418 (1996-01-01), Giannuzzi
patent: 5630688 (1997-05-01), Tran
patent: 5833415 (1998-11-01), McSherry
Joker Industrial Co., Ltd.
Wilson Neil
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