Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Impact driven fastener – e.g. – nail – spike – tack – etc. – Of sheet metal
Reexamination Certificate
1999-06-15
2001-11-20
Saether, Flemming (Department: 3627)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Impact driven fastener, e.g., nail, spike, tack, etc.
Of sheet metal
Reexamination Certificate
active
06318943
ABSTRACT:
BACKGROUND OF THE INVENTION
1. FIELD OF THE INVENTION
This invention relates to V type nails or wedge fasteners as used for joining purposes especially, but not exclusively, for securing wooden frame members of picture or similar frames i.e. at mitre joints between the frame members. Various other uses of the nails arise generally in woodwork and joinery.
2. DESCRIPTION OF THE RELATED ART
As currently used and shown in
FIGS. 1 and 2
of the accompanying drawings such V nails are made of thin sheet steel and provide two diverging sides portions
1
about an included angle of 90 degrees or thereabouts, the outer edges of the side portions being outwardly flanged in a curved manner at
11
. The side portions
1
at one end of the nail are sharpened to provide cutting edges to enable the nail to be driven into woodwork in the manner shown in FIG.
2
.
Hitherto the practice has been to provide at least two kinds of nail, one suitable for softwood and the other for hardwood. For softwood the single sided cutting edge is as shown in FIG.
3
and the double sided edge of
FIG. 4
is for hardwood. In each case and as the nail is driven into abutting frame as like members F e.g. at a mitre joint M (
FIG. 2
) the action of the taper cutting edges T is to draw the frame members tightly together at the joint. In the case of the nail for hardwood use such drawing together action is augmented by controlled outward flaring or the opening deformation of the sides
1
of the nail.
As shown in
FIG. 5
, the nails may be provided in detachably adhered stick form
7
for convenient use such as by power driven hammer operation.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an improved dual purpose form of V nail capable of effective use in both softwood and hardwood. A further object is to enable the nails to be readily driven into position with especial advantage as regards power tool operation. These and other practical advantages will be apparent from the following description.
According to the invention a V type nail is characterised by at least part of each side portion of the nail being outwardly tapered from the driven end to the leading or cutting edge end thereof so as to act on woodwork or other suitable material as it is driven therein at a joint and thus obtain and maintain a tight joint.
The leading or cutting edge end is preferably sharpened to an unequal double sided edge configuration as for hardwood.
Tapered outer parts of the side portions of the nail may be about a lesser included angle than that between inner parts of the side portions at their V form junction.
REFERENCES:
patent: 3431810 (1969-03-01), Black
patent: 3898906 (1975-08-01), Greenberg
patent: 4681498 (1987-07-01), Raffoni
patent: 5193959 (1993-03-01), Motta
Mitchell Silberberg & Knupp LLP
Saether Flemming
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