Improvements in or connected with Bifurcated Rivets.
Year: 1894

page_text: Date of Application, 18th Jan., 1894
Complete Specification Left, 2nd Oct., 1894-Accepted, 24th Nov., 1894
PROVISIONAL SPECIFICATION.
Improvements in or connected with Bifurcated Rivets.
I, ALFRED WILLIAM KNIGHT, of Cuckfield, in the County of Sussex,
Ironinonger and Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to an improvement applicable for use with bifurcated
rivets whereby the prongs or projections, when clinched on the back of the material
to which the rivets are applied, are protected from wear.
For this purpose instead of clinching the prongs or projections directly against
the back of the leather or other material I employ a thin metal washer or burr
provided with a hole or holes through which the prongs pass and also stamped so
as to form recesses in which the prongs lie shielded when clinched the stamping of
the said recesses also forming projections which become embedded in the leather by
the clinching of the rivet.
Dated the 18th of January 1894.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or connected with Bifurcated Rivets.
I, Alfred WiLLIAM KNIGHT, of Cuckfield, in the County of Sussex,
Ironmonger and Engineer, 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 an improvement applicable for use with bifurcated
rivets, whereby the prongs or projections, when clinched on the material to which
the rivets are applied, are protected from wear.
For this purpose instead of clinching the prongs or projections directly against
the leather or other material I employ a thin metal washer, plate or burr provided
with a hole or holes through which the prongs pass and which is also advantageously
stamped so as to form a recess or recesses in which the prongs or clinches lie
shielded when clinched, the said recesses forming projections which become
embedded in the material by the clinching of the rivet.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which :-
Figures 1 and 2 are respectively a plan and an edge view of a metal washer
constructed according to this invention for use in combination with bifurcated
rivets :
Figure 3 is a section on the line 3-—3, Figure 1:
Figures 4 and 5 are sections illustrating the application of the washer; and,
Figure 6 is a plan of the same :
Figures 7 and 8 are similar views to Figures 1 and 2 respectively illustrating a
modification of the washer; and,
Figure 9 is a section on the line 9-9, Figure 7 :

page_text: Figures 10 and 11 are sections illustrating the application of the said washer;
and,
Figure 12 is a sectional view of a tool to be used during such application.
Similar letters of reference indicate corresponding parts in the several figures.
a indicates my washer having the holes b, b and the recesses c, c therein, and
d indicates a rivet having the prongs e, e, and ƒ material into which the same is
driven.
The washer shewn in Figures 1 to 6 is practically a flat disc having the
recesses c, c formed between the holes b, b and the periphery of the disc, the said
holes being of a shape corresponding approximately with the prongs of the rivet
and the recesses of such a depth that when the prongs are clinched over into the
recesses the surface of the clinched or turned over portions will be flush with the
surface of the disc, the latter also being in contact with the material f, the projec-
tions formed by the recesses e, e being embedded in the said material. The
recessing of the washers at c, c when stamped out of thin sheet metal, forms
projections which, when the washer is applied, are embedded in the material, as
shewn in Figure 5, when the prongs are clinched.
The disc or washer shewn in Figures 7 to 11 is of substantially the same
construction as that hereinbefore described except that it is dished so as to bring
the periphery into close contact with the material f, this arrangement being
especially applicable to rivets used for saddlery purposes as it permits of the washer
or burr and clinched end of the rivet being placed on the face side of the leather
without presenting an unsightly appearance.
In clinching rivets over washers of this kind I advantageously use a rivetting
anvil or punch having the operating face shaped to fit the washer as shewn in
Figure 12 so as to ensure the clinched prongs being bent so that they shall be flush
with the curved surface of the washer as shewn in Figure 11.
Although I have described and illustrated my washers as being circular in shape
it will be obvious they may be made rectangular or of any other suitable shape
in plan.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A metal washer, plate or burr (for use in combination with bifurcated rivets)
having one or two holes through which the prongs of the rivets pass and two
recesses to receive the turned down portions of the prongs when clinched,
substantially as described.
2. A metal washer, plate or burr for use in combination with bifurcated rivets,
the said washer being dished and having a hole or holes to allow the prongs to pass
through and two recesses to receive the said prongs when clinched substantially as,
and for the purposes, described.
Dated the 1st dev of October 1894