Improvements in Rivets, Bolts, and Nuts.
Year: 1891

page_text: Date of Application, 14th Jan., 1891
Complete Specification Left, 7th Oct., 1891-Accepted, 7th N v., 1891
PROVISIONAL SPECIFICATION.
Improvements in Rivets, Bolts, and Nuts.
FREDERICK JAMES SINNETTE, Woolston Lodge, Woolston, Southampton,
Surveyor of Shipping, do hereby declare the nature of this invention to be as
follows:-
It is well known that by drilling but more particularly by punching plates,
it is in practice found impossible to prevent a large amount of burr or bulged
surface to be formed around lower side of hole in the case of such as good
quality iron or steel plates, and that on account of the hard and sharp nature
of this burr, during the riveting process for example it is partly forced up into
the hot head of the rivet, and on account of its springy nature gives great trouble
and prevents the rivet being closed, wounding its head, drawing it in and often-
tines distorting and splitting it very much, this too at the part where the
greatest stresses are set up by the contraction of the rivet during cooling; in
order to avoid these serious troubles and admit of the head of rivet being easily
and efficiently closed thus allowing the full bearing surface and strength of head
being obtained with infinitely better results in every other way, I so fashion
the under side of head near the part adjoining the shank that it accommodates
the burr either in a small groove or by bevelling the under part of head or
other similar means; the method suits equally well in the case of bolt heads or
nuts for holes having burr around them by allowing them to fay properly to
the plates when hove up, instead of bearing on the burr only and thus destroying
to a large extent the efficiency of the fastening in many important respects.
Dated this 12th day of January 1891.
FREDERICK JAMES SINNETTE.
COMPLETE SPECIFICATION.
Improvements in Rivets, Bolts, and Nuts.
FREDERICK JAMES SINNETTE, Woolston Lodge, Woolston, Southampton,
Surveyor of Shipping, 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 rivets bolts and nuts and the improvements are as
illustrated by the figures on the accompanying drawing which show the provision
made on the under side of rivet heads to accommodate burr formed around
holes, the figures also may be taken as showing the provision made on the under-
side of bolt heads as well as on the faying side of nuts to accommodate burr
formed around holes. It is well known in practice that by drilling but more
particularly by punching holes in plates it is found impossible to prevent a
large amount of burr or bulged surface to be formed around lower side of hole
in the case of such as good quality iron or steel plates and that on account of
the hard and sharp nature of this burr and there being at present no provision
made to accommodate it, that during the riveting process for example it is partly
forced up into the hot head of the rivet and on account of its springy nature
gives great trouble and prevents the rivet being closed, wounding its head and
drawing it in and oftentimes distorting and splitting head very much, this too
at the part where the greatest stresses are set up by the contraction of the
rivet during cooling; in order to avoid these serious troubles and admit of the
head of rivet being easily and efficiently closed thus allowing the full bearing

page_text: surface and strength of head being obtained with infinitely better results in every
other way, I so fashion the underside of head near the part adjoining the shank
that it accommodates the burr either in a small groove as shown at A in Fig. 1,
or by bevelling the under part of head as shown at b in Fig. 2, or other similar
means according to the amount of burr and the diameter of the rivet, so long
as the necessary accommodation is provided for the burr, but I find the two
methods shown on the figures to be the most effectual and they are quite easily
carried out in the manufacture of the rivet and may be applied to any form of
head; the improvements suit equally well in the case of bolt heads or nuts for
use where holes have burr around their edges by allowing them to fay properly
to the plates when hove up instead of bearing on the burr only and thus destroying
to a large extent the closing power and efficiency of the fastening in many important
respects.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is,
A rivet bolt and nut formed with a groove or bevel as described with reference
to the accompanying drawing.
Dated this Sixth day of October 1801