Year: 1886

page_text: I, JUDSON LEVATOR THOMSON, of Syracuse, in the County of Onondaga¸ and
State of New York, one of the United States of America, Manufacturer, do
hereby declare the nature of this invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement:—
This invention relates to the class of rivets which are converted into clinching
nails by a bifurcation of the shank producing pliable clinching prongs which are
readily bent over to fasten the rivet to the article to which it is to be applied.
The invention consists in an improved construction of the clinching prongs,
whereby they receive firstly a broad bearing, and thus a more secure hold on the
material on which the prongs are clinched; secondly, a gradual taper from end to
end so that the flexibility is gradually increased toward their free ends, and thus
the main portions of said prongs have the requisite stability to pass through the
material to which the rivet is to be applied, without bending in either direction,
while the end portions of the prongs are sufficiently pliable to be clinched; and
thirdly, said prongs are furnished with broad chisel points which readily penetrate
the material, and at the same time present wedging faces, which by the resistance
of the material, cause the ends of the prongs to bend over and back into the
material.
My invention is fully illustrated in the annexed drawing, wherein Fig's. 1, 2, and 3
are side views of my improved rivet taken at the edges of the prongs; Fig. 4 is a
side view taken at the flat side of the prongs; Fig. 5 is a transverse section on
line xx Fig. 2; and Fig'a 6 and 7 show the rivet clinched to the article to which
it is applied.
h, represents the head of the rivet, and a, a, are the two clinching prongs, each
of which I flatten on opposite sides, and arrange with its flat sides directly
opposite those of the other prong, and with a space b, between them. Said prongs
I taper throughout their length in a plane at right angles to the flat sides; the
taper may be either wholly on the inner side as shown in Fig. 1 of the drawing,
or wholly on the outer side as shown in Fig. 3 of the drawing, or partly on
the inner and outer sides as represented in Fig. 2 of the drawing. Either
construction will serve to gradually increase the flexibility of the prongs toward
the free ends thereof, and at the same time impart the requisite stability to the
main portion of the prongs as hereinbefore stated.
תי

page_text: The free ends of the prongs a, a, I form into broad chisel points c, by beveling
the end portion of the prong either on the inner side as shown in Fig. 1 of the
drawing so as to cause the prongs to automatically bend outward as represented
in Fig. 6 of the drawing, or on the outer side of the prongs as shown in Fig. 3 of
the drawing, and thus cause the prongs to turn inward during the process
of forcing them through the article to which the rivet is applied as illustrated in
Fig. 7 of the drawing; The said chisel points present broad wedging faces which
produce the aforesaid automatic clinching of the prongs.
The intermediate space 6 leaves the material between the two prongs intact, and
thus greatly preserves the integrity of the article to which the rivet is applied and
strengthen the hold of the rivet, which hold is further insured by the flattening of
the prongs.
Having now particularly described & ascertained the nature of my invention,
and in what manner the same is to be performed, I declare that what I claim is
1.-A rivet having clinching prongs each flattened on opposite sides, and
arranged with its flat sides directly opposite those of the other, with a space
between them as set forth and shown.
2. A rivet having clinching prongs, each flattened on opposite sides, and
arranged with its flat sides directly opposite those of the other, and tapered
throughout its length in a plane at right angles to the flat sides, substantially as
described and shown.
'
3. A rivet having clinching prongs, each flattened on opposite sides, and
arranged with its flat sides directly opposite those of the other, and beveled to a
broad chisel point at the free end substantially as described and shown.
4. A rivet having clinching prongs, each flattened on opposite sides, and
arranged with its flat sides directly opposite those of the other with a space
between them and tapered throughout its length, and beveled to a broad chisel
point at the free end substantially in the manner specified and shown.
Dated this 21st day of January 1886.