An Improved Rivet or Rivets.
Year: 1890

page_text: Date of Application, 25th Feb., 1890
Complete Specification Left, 31st July, 1890-Accepted, 4th Oct., 1890
PROVISIONAL SPECIFICATION.
An Improved Rivet or Rivets.
THOMAS PAUL LOMAS of 8 Surrey Lane Battersea in the County of Surrey Agent
do hereby declare the nature of this invention to be as follows:-
The object of my invention is to manufacture improved rivets, so that in joining
articles, sheets or plates of metal, and other substances by means of riveting, there
shall be an allowance for expansion.
The method of carrying out my invention consists of making or inserting a groove,
or slight hollow cavity round the shank of the rivet, also a concave or other shaped
indent at the end of the shank, by this means, riveting articles, plates of metal &c.
together will be better accomplished, as the groove or hollow cavity round the shank,
will allow for expansion and prevent the seams opening, and the hollow in the end of
rivet will allow of a better burr and a quicker means of riveting.
My improved rivet or rivets may be made with the groove or hollow cavity round
the shank only, or the concave or indent in the end of shank only, to suit the
varied purposes for which rivets are used, they may be made of wire wrought or cast
metals of any kind, or any other suitable material, the groove or cavity round the
shank may be varied in size shape or number, the concave or indent in the end of
shank may be varied in size or pattern.
Dated this 25th day of February 1890.
COMPLETE SPECIFICATION.
An Improved Rivet or Rivets.
I THOMAS PAUL LOMAS of 8 Surrey Lane, Battersea, in the County of Surrey,
Agent, do hereby declare the nature of my said invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement:-
•
Whereas in riveting articles together with ordinary rivets, it is found that the
swelling of the shank seriously affects the operation and renders it defective. The
swelling of the shank expands the metal laterally, and frequently splits the metal.
The lateral expansion of the metal (such as boiler plates) by the rivets, has a tendency
to open the plates between the rivets, and renders caulking necessary.
Now the object of my invention is to form the rivets in an improved manner, so as
to overcome the aforesaid defects, and ensure good and sound riveting.
In carrying out my invention I reduce the diameter of the shank of the rivet
so us to allow for the expansion of the same, when being struck; and I also form a
concavity in the end of the shank, in order to provide for the spreading and overlapping
of the rivet at the end.
By these means the rivet holes are well filled out without bursting the metal: the
metal is not distorted; and a good burr is ensured.
And in order that my said invention may be particularly described and ascertained,
reference is hereby made to the accompanying drawings, in which similar letters of
reference indicate corresponding parts.
Fig. 1, is an elevation,
Fig. 2 a section, and
Fig. 3. a plan of one of my improved rivets.
a is the shank of the rivet. bis the head. c is a concavity formed in the end of the

page_text: made cylindrical, with vertical sides, as shewn by dotted lines in Fig. 2. At d the
reduced diameter of the shank is shown.
When the rivets are swaged in the plates, the grooved portion d expands and fills
the rivet holes, without bursting or otherwise injuring the plates; and the plates
are united fair and true, without distortion or bending; the joining of the plates
being rendered perfect, so as not to require caulking or other unworkmanlike
treatment.
The concave end greatly facilitates the formation of the burr, and assists the
spreading of the metal.
My invention is applicable to rivets with ellipsoidal, segmental, countersink, cheese,
and otherwise formed heads.
The amount of reduction in the diameter, and the depth of the concavity c, may be
greater or less, according to the description of rivet and the character of the work.
Also two or more grooved or reduced portions may be made in the same rivet, to
suit the number of plates to be riveted together, and to prevent the bulging of the
rivets between the plates.
In some cases the groove d may be omitted and the concavity c only used, and in
other cases the groove d only is used and the concavity dispensed with.
My improved rivets may be made of wire, wrought or cast metals of any kind, or
any other suitable material.
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. The manufacture and use of rivets having one or more groove or grooves
or reduced portions d in the shank, and a concavity cat the end of the shank,
substantially as and for the purposes hereinbefore described and illustrated by the
drawings.
2. The manufacture and use of rivets having one or more groove or grooves, or
reduced portions d in the shank, substantially as and for the purposes hereinbefore
described and illustrated by the drawings.
3. The manufacture and use of rivets having a recess or concavity c forined in the
end of the shank, substantially as and for the purposes herein before described and
illustrated by the drawings.
Dota 21+ T... 1900